OpusEncoder structure.
+ * @param[in] channels int: Number of channels.
+ * This must be 1 or 2.
+ * @returns The size in bytes.
+ * @note Since this function does not take the application as input, it will overestimate
+ * the size required for OPUS_APPLICATION_RESTRICTED_SILK and OPUS_APPLICATION_RESTRICTED_CELT.
+ * That is generally not a problem, except when trying to know the size to use for a copy.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_encoder_get_size(int channels);
+
+/**
+ */
+
+/** Allocates and initializes an encoder state.
+ * There are three coding modes:
+ *
+ * @ref OPUS_APPLICATION_VOIP gives best quality at a given bitrate for voice
+ * signals. It enhances the input signal by high-pass filtering and
+ * emphasizing formants and harmonics. Optionally it includes in-band
+ * forward error correction to protect against packet loss. Use this
+ * mode for typical VoIP applications. Because of the enhancement,
+ * even at high bitrates the output may sound different from the input.
+ *
+ * @ref OPUS_APPLICATION_AUDIO gives best quality at a given bitrate for most
+ * non-voice signals like music. Use this mode for music and mixed
+ * (music/voice) content, broadcast, and applications requiring less
+ * than 15 ms of coding delay.
+ *
+ * @ref OPUS_APPLICATION_RESTRICTED_LOWDELAY configures low-delay mode that
+ * disables the speech-optimized mode in exchange for slightly reduced delay.
+ * This mode can only be set on an newly initialized or freshly reset encoder
+ * because it changes the codec delay.
+ *
+ * This is useful when the caller knows that the speech-optimized modes will not be needed (use with caution).
+ * @param [in] Fs opus_int32: Sampling rate of input signal (Hz)
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param [in] channels int: Number of channels (1 or 2) in input signal
+ * @param [in] application int: Coding mode (one of @ref OPUS_APPLICATION_VOIP, @ref OPUS_APPLICATION_AUDIO, or @ref OPUS_APPLICATION_RESTRICTED_LOWDELAY)
+ * @param [out] error int*: @ref opus_errorcodes
+ * @note Regardless of the sampling rate and number channels selected, the Opus encoder
+ * can switch to a lower audio bandwidth or number of channels if the bitrate
+ * selected is too low. This also means that it is safe to always use 48 kHz stereo input
+ * and let the encoder optimize the encoding.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusEncoder *opus_encoder_create(
+ opus_int32 Fs,
+ int channels,
+ int application,
+ int *error
+);
+
+/** Initializes a previously allocated encoder state
+ * The memory pointed to by st must be at least the size returned by opus_encoder_get_size().
+ * This is intended for applications which use their own allocator instead of malloc.
+ * @see opus_encoder_create(),opus_encoder_get_size()
+ * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
+ * @param [in] st OpusEncoder*: Encoder state
+ * @param [in] Fs opus_int32: Sampling rate of input signal (Hz)
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param [in] channels int: Number of channels (1 or 2) in input signal
+ * @param [in] application int: Coding mode (one of OPUS_APPLICATION_VOIP, OPUS_APPLICATION_AUDIO, or OPUS_APPLICATION_RESTRICTED_LOWDELAY)
+ * @retval #OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_encoder_init(
+ OpusEncoder *st,
+ opus_int32 Fs,
+ int channels,
+ int application
+) OPUS_ARG_NONNULL(1);
+
+/** Encodes an Opus frame.
+ * @param [in] st OpusEncoder*: Encoder state
+ * @param [in] pcm opus_int16*: Input signal (interleaved if 2 channels). length is frame_size*channels*sizeof(opus_int16)
+ * @param [in] frame_size int: Number of samples per channel in the
+ * input signal.
+ * This must be an Opus frame size for
+ * the encoder's sampling rate.
+ * For example, at 48 kHz the permitted
+ * values are 120, 240, 480, 960, 1920,
+ * and 2880.
+ * Passing in a duration of less than
+ * 10 ms (480 samples at 48 kHz) will
+ * prevent the encoder from using the LPC
+ * or hybrid modes.
+ * @param [out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode(
+ OpusEncoder *st,
+ const opus_int16 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes an Opus frame.
+ * @param [in] st OpusEncoder*: Encoder state
+ * @param [in] pcm opus_int32*: Input signal (interleaved if 2 channels) representing (or slightly exceeding) 24-bit values. length is frame_size*channels*sizeof(opus_int32)
+ * @param [in] frame_size int: Number of samples per channel in the
+ * input signal.
+ * This must be an Opus frame size for
+ * the encoder's sampling rate.
+ * For example, at 48 kHz the permitted
+ * values are 120, 240, 480, 960, 1920,
+ * and 2880.
+ * Passing in a duration of less than
+ * 10 ms (480 samples at 48 kHz) will
+ * prevent the encoder from using the LPC
+ * or hybrid modes.
+ * @param [out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode24(
+ OpusEncoder *st,
+ const opus_int32 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes an Opus frame from floating point input.
+ * @param [in] st OpusEncoder*: Encoder state
+ * @param [in] pcm float*: Input in float format (interleaved if 2 channels), with a normal range of +/-1.0.
+ * Samples with a range beyond +/-1.0 are supported but will
+ * be clipped by decoders using the integer API and should
+ * only be used if it is known that the far end supports
+ * extended dynamic range.
+ * length is frame_size*channels*sizeof(float)
+ * @param [in] frame_size int: Number of samples per channel in the
+ * input signal.
+ * This must be an Opus frame size for
+ * the encoder's sampling rate.
+ * For example, at 48 kHz the permitted
+ * values are 120, 240, 480, 960, 1920,
+ * and 2880.
+ * Passing in a duration of less than
+ * 10 ms (480 samples at 48 kHz) will
+ * prevent the encoder from using the LPC
+ * or hybrid modes.
+ * @param [out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode_float(
+ OpusEncoder *st,
+ const float *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Frees an OpusEncoder allocated by opus_encoder_create().
+ * @param[in] st OpusEncoder*: State to be freed.
+ */
+OPUS_EXPORT void opus_encoder_destroy(OpusEncoder *st);
+
+/** Perform a CTL function on an Opus encoder.
+ *
+ * Generally the request and subsequent arguments are generated
+ * by a convenience macro.
+ * @param st OpusEncoder*: Encoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls or
+ * @ref opus_encoderctls.
+ * @see opus_genericctls
+ * @see opus_encoderctls
+ */
+OPUS_EXPORT int opus_encoder_ctl(OpusEncoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+/**@}*/
+
+/** @defgroup opus_decoder Opus Decoder
+ * @{
+ *
+ * @brief This page describes the process and functions used to decode Opus.
+ *
+ * The decoding process also starts with creating a decoder
+ * state. This can be done with:
+ * @code
+ * int error;
+ * OpusDecoder *dec;
+ * dec = opus_decoder_create(Fs, channels, &error);
+ * @endcode
+ * where
+ * @li Fs is the sampling rate and must be 8000, 12000, 16000, 24000, or 48000
+ * @li channels is the number of channels (1 or 2)
+ * @li error will hold the error code in case of failure (or #OPUS_OK on success)
+ * @li the return value is a newly created decoder state to be used for decoding
+ *
+ * While opus_decoder_create() allocates memory for the state, it's also possible
+ * to initialize pre-allocated memory:
+ * @code
+ * int size;
+ * int error;
+ * OpusDecoder *dec;
+ * size = opus_decoder_get_size(channels);
+ * dec = malloc(size);
+ * error = opus_decoder_init(dec, Fs, channels);
+ * @endcode
+ * where opus_decoder_get_size() returns the required size for the decoder state. Note that
+ * future versions of this code may change the size, so no assumptions should be made about it.
+ *
+ * The decoder state is always continuous in memory and only a shallow copy is sufficient
+ * to copy it (e.g. memcpy())
+ *
+ * To decode a frame, opus_decode() or opus_decode_float() must be called with a packet of compressed audio data:
+ * @code
+ * frame_size = opus_decode(dec, packet, len, decoded, max_size, 0);
+ * @endcode
+ * where
+ *
+ * @li packet is the byte array containing the compressed data
+ * @li len is the exact number of bytes contained in the packet
+ * @li decoded is the decoded audio data in opus_int16 (or float for opus_decode_float())
+ * @li max_size is the max duration of the frame in samples (per channel) that can fit into the decoded_frame array
+ *
+ * opus_decode() and opus_decode_float() return the number of samples (per channel) decoded from the packet.
+ * If that value is negative, then an error has occurred. This can occur if the packet is corrupted or if the audio
+ * buffer is too small to hold the decoded audio.
+ *
+ * Opus is a stateful codec with overlapping blocks and as a result Opus
+ * packets are not coded independently of each other. Packets must be
+ * passed into the decoder serially and in the correct order for a correct
+ * decode. Lost packets can be replaced with loss concealment by calling
+ * the decoder with a null pointer and zero length for the missing packet.
+ *
+ * A single codec state may only be accessed from a single thread at
+ * a time and any required locking must be performed by the caller. Separate
+ * streams must be decoded with separate decoder states and can be decoded
+ * in parallel unless the library was compiled with NONTHREADSAFE_PSEUDOSTACK
+ * defined.
+ *
+ */
+
+/** Opus decoder state.
+ * This contains the complete state of an Opus decoder.
+ * It is position independent and can be freely copied.
+ * @see opus_decoder_create,opus_decoder_init
+ */
+typedef struct OpusDecoder OpusDecoder;
+
+/** Opus DRED decoder.
+ * This contains the complete state of an Opus DRED decoder.
+ * It is position independent and can be freely copied.
+ * @see opus_dred_decoder_create,opus_dred_decoder_init
+ */
+typedef struct OpusDREDDecoder OpusDREDDecoder;
+
+
+/** Opus DRED state.
+ * This contains the complete state of an Opus DRED packet.
+ * It is position independent and can be freely copied.
+ * @see opus_dred_create,opus_dred_init
+ */
+typedef struct OpusDRED OpusDRED;
+
+/** Gets the size of an OpusDecoder structure.
+ * @param [in] channels int: Number of channels.
+ * This must be 1 or 2.
+ * @returns The size in bytes.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decoder_get_size(int channels);
+
+/** Allocates and initializes a decoder state.
+ * @param [in] Fs opus_int32: Sample rate to decode at (Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param [in] channels int: Number of channels (1 or 2) to decode
+ * @param [out] error int*: #OPUS_OK Success or @ref opus_errorcodes
+ *
+ * Internally Opus stores data at 48000 Hz, so that should be the default
+ * value for Fs. However, the decoder can efficiently decode to buffers
+ * at 8, 12, 16, and 24 kHz so if for some reason the caller cannot use
+ * data at the full sample rate, or knows the compressed data doesn't
+ * use the full frequency range, it can request decoding at a reduced
+ * rate. Likewise, the decoder is capable of filling in either mono or
+ * interleaved stereo pcm buffers, at the caller's request.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusDecoder *opus_decoder_create(
+ opus_int32 Fs,
+ int channels,
+ int *error
+);
+
+/** Initializes a previously allocated decoder state.
+ * The state must be at least the size returned by opus_decoder_get_size().
+ * This is intended for applications which use their own allocator instead of malloc. @see opus_decoder_create,opus_decoder_get_size
+ * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
+ * @param [in] st OpusDecoder*: Decoder state.
+ * @param [in] Fs opus_int32: Sampling rate to decode to (Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param [in] channels int: Number of channels (1 or 2) to decode
+ * @retval #OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_decoder_init(
+ OpusDecoder *st,
+ opus_int32 Fs,
+ int channels
+) OPUS_ARG_NONNULL(1);
+
+/** Decode an Opus packet.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len opus_int32: Number of bytes in payload*
+ * @param [out] pcm opus_int16*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(opus_int16)
+ * @param [in] frame_size Number of samples per channel of available space in \a pcm.
+ * If this is less than the maximum packet duration (120ms; 5760 for 48kHz), this function will
+ * not be capable of decoding some packets. In the case of PLC (data==NULL) or FEC (decode_fec=1),
+ * then frame_size needs to be exactly the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the next incoming packet. For the PLC and
+ * FEC cases, frame_size must be a multiple of 2.5 ms.
+ * @param [in] decode_fec int: Flag (0 or 1) to request that any in-band forward error correction data be
+ * decoded. If no such data is available, the frame is decoded as if it were lost.
+ * @returns Number of decoded samples per channel or @ref opus_errorcodes
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decode(
+ OpusDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int16 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode an Opus packet.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len opus_int32: Number of bytes in payload*
+ * @param [out] pcm opus_int32*: Output signal (interleaved if 2 channels) representing (or slightly exceeding) 24-bit values. length
+ * is frame_size*channels*sizeof(opus_int32)
+ * @param [in] frame_size Number of samples per channel of available space in \a pcm.
+ * If this is less than the maximum packet duration (120ms; 5760 for 48kHz), this function will
+ * not be capable of decoding some packets. In the case of PLC (data==NULL) or FEC (decode_fec=1),
+ * then frame_size needs to be exactly the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the next incoming packet. For the PLC and
+ * FEC cases, frame_size must be a multiple of 2.5 ms.
+ * @param [in] decode_fec int: Flag (0 or 1) to request that any in-band forward error correction data be
+ * decoded. If no such data is available, the frame is decoded as if it were lost.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decode24(
+ OpusDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int32 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode an Opus packet with floating point output.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len opus_int32: Number of bytes in payload
+ * @param [out] pcm float*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(float)
+ * @param [in] frame_size Number of samples per channel of available space in \a pcm.
+ * If this is less than the maximum packet duration (120ms; 5760 for 48kHz), this function will
+ * not be capable of decoding some packets. In the case of PLC (data==NULL) or FEC (decode_fec=1),
+ * then frame_size needs to be exactly the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the next incoming packet. For the PLC and
+ * FEC cases, frame_size must be a multiple of 2.5 ms.
+ * @param [in] decode_fec int: Flag (0 or 1) to request that any in-band forward error correction data be
+ * decoded. If no such data is available the frame is decoded as if it were lost.
+ * @returns Number of decoded samples per channel or @ref opus_errorcodes
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decode_float(
+ OpusDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ float *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Perform a CTL function on an Opus decoder.
+ *
+ * Generally the request and subsequent arguments are generated
+ * by a convenience macro.
+ * @param st OpusDecoder*: Decoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls or
+ * @ref opus_decoderctls.
+ * @see opus_genericctls
+ * @see opus_decoderctls
+ */
+OPUS_EXPORT int opus_decoder_ctl(OpusDecoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+
+/** Frees an OpusDecoder allocated by opus_decoder_create().
+ * @param[in] st OpusDecoder*: State to be freed.
+ */
+OPUS_EXPORT void opus_decoder_destroy(OpusDecoder *st);
+
+/** Gets the size of an OpusDREDDecoder structure.
+ * @returns The size in bytes.
+ */
+OPUS_EXPORT int opus_dred_decoder_get_size(void);
+
+/** Allocates and initializes an OpusDREDDecoder state.
+ * @param [out] error int*: #OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_EXPORT OpusDREDDecoder *opus_dred_decoder_create(int *error);
+
+/** Initializes an OpusDREDDecoder state.
+ * @param[in] dec OpusDREDDecoder*: State to be initialized.
+ */
+OPUS_EXPORT int opus_dred_decoder_init(OpusDREDDecoder *dec);
+
+/** Frees an OpusDREDDecoder allocated by opus_dred_decoder_create().
+ * @param[in] dec OpusDREDDecoder*: State to be freed.
+ */
+OPUS_EXPORT void opus_dred_decoder_destroy(OpusDREDDecoder *dec);
+
+/** Perform a CTL function on an Opus DRED decoder.
+ *
+ * Generally the request and subsequent arguments are generated
+ * by a convenience macro.
+ * @param dred_dec OpusDREDDecoder*: DRED Decoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls or
+ * @ref opus_decoderctls.
+ * @see opus_genericctls
+ * @see opus_decoderctls
+ */
+OPUS_EXPORT int opus_dred_decoder_ctl(OpusDREDDecoder *dred_dec, int request, ...);
+
+/** Gets the size of an OpusDRED structure.
+ * @returns The size in bytes.
+ */
+OPUS_EXPORT int opus_dred_get_size(void);
+
+/** Allocates and initializes a DRED state.
+ * @param [out] error int*: #OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_EXPORT OpusDRED *opus_dred_alloc(int *error);
+
+/** Frees an OpusDRED allocated by opus_dred_create().
+ * @param[in] dec OpusDRED*: State to be freed.
+ */
+OPUS_EXPORT void opus_dred_free(OpusDRED *dec);
+
+/** Decode an Opus DRED packet.
+ * @param [in] dred_dec OpusDRED*: DRED Decoder state
+ * @param [in] dred OpusDRED*: DRED state
+ * @param [in] data char*: Input payload
+ * @param [in] len opus_int32: Number of bytes in payload
+ * @param [in] max_dred_samples opus_int32: Maximum number of DRED samples that may be needed (if available in the packet).
+ * @param [in] sampling_rate opus_int32: Sampling rate used for max_dred_samples argument. Needs not match the actual sampling rate of the decoder.
+ * @param [out] dred_end opus_int32*: Number of non-encoded (silence) samples between the DRED timestamp and the last DRED sample.
+ * @param [in] defer_processing int: Flag (0 or 1). If set to one, the CPU-intensive part of the DRED decoding is deferred until opus_dred_process() is called.
+ * @returns Offset (positive) of the first decoded DRED samples, zero if no DRED is present, or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_dred_parse(OpusDREDDecoder *dred_dec, OpusDRED *dred, const unsigned char *data, opus_int32 len, opus_int32 max_dred_samples, opus_int32 sampling_rate, int *dred_end, int defer_processing) OPUS_ARG_NONNULL(1);
+
+/** Finish decoding an Opus DRED packet. The function only needs to be called if opus_dred_parse() was called with defer_processing=1.
+ * The source and destination will often be the same DRED state.
+ * @param [in] dred_dec OpusDRED*: DRED Decoder state
+ * @param [in] src OpusDRED*: Source DRED state to start the processing from.
+ * @param [out] dst OpusDRED*: Destination DRED state to store the updated state after processing.
+ * @returns @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_dred_process(OpusDREDDecoder *dred_dec, const OpusDRED *src, OpusDRED *dst);
+
+/** Decode audio from an Opus DRED packet with 16-bit output.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] dred OpusDRED*: DRED state
+ * @param [in] dred_offset opus_int32: position of the redundancy to decode (in samples before the beginning of the real audio data in the packet).
+ * @param [out] pcm opus_int16*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(opus_int16)
+ * @param [in] frame_size Number of samples per channel to decode in \a pcm.
+ * frame_size must be a multiple of 2.5 ms.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_decoder_dred_decode(OpusDecoder *st, const OpusDRED *dred, opus_int32 dred_offset, opus_int16 *pcm, opus_int32 frame_size);
+
+/** Decode audio from an Opus DRED packet with 24-bit output.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] dred OpusDRED*: DRED state
+ * @param [in] dred_offset opus_int32: position of the redundancy to decode (in samples before the beginning of the real audio data in the packet).
+ * @param [out] pcm opus_int32*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(opus_int16)
+ * @param [in] frame_size Number of samples per channel to decode in \a pcm.
+ * frame_size must be a multiple of 2.5 ms.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_decoder_dred_decode24(OpusDecoder *st, const OpusDRED *dred, opus_int32 dred_offset, opus_int32 *pcm, opus_int32 frame_size);
+
+/** Decode audio from an Opus DRED packet with floating point output.
+ * @param [in] st OpusDecoder*: Decoder state
+ * @param [in] dred OpusDRED*: DRED state
+ * @param [in] dred_offset opus_int32: position of the redundancy to decode (in samples before the beginning of the real audio data in the packet).
+ * @param [out] pcm float*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(float)
+ * @param [in] frame_size Number of samples per channel to decode in \a pcm.
+ * frame_size must be a multiple of 2.5 ms.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_EXPORT int opus_decoder_dred_decode_float(OpusDecoder *st, const OpusDRED *dred, opus_int32 dred_offset, float *pcm, opus_int32 frame_size);
+
+
+/** Parse an opus packet into one or more frames.
+ * Opus_decode will perform this operation internally so most applications do
+ * not need to use this function.
+ * This function does not copy the frames, the returned pointers are pointers into
+ * the input packet.
+ * @param [in] data char*: Opus packet to be parsed
+ * @param [in] len opus_int32: size of data
+ * @param [out] out_toc char*: TOC pointer
+ * @param [out] frames char*[48] encapsulated frames
+ * @param [out] size opus_int16[48] sizes of the encapsulated frames
+ * @param [out] payload_offset int*: returns the position of the payload within the packet (in bytes)
+ * @returns number of frames
+ */
+OPUS_EXPORT int opus_packet_parse(
+ const unsigned char *data,
+ opus_int32 len,
+ unsigned char *out_toc,
+ const unsigned char *frames[48],
+ opus_int16 size[48],
+ int *payload_offset
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(5);
+
+/** Gets the bandwidth of an Opus packet.
+ * @param [in] data char*: Opus packet
+ * @retval OPUS_BANDWIDTH_NARROWBAND Narrowband (4kHz bandpass)
+ * @retval OPUS_BANDWIDTH_MEDIUMBAND Mediumband (6kHz bandpass)
+ * @retval OPUS_BANDWIDTH_WIDEBAND Wideband (8kHz bandpass)
+ * @retval OPUS_BANDWIDTH_SUPERWIDEBAND Superwideband (12kHz bandpass)
+ * @retval OPUS_BANDWIDTH_FULLBAND Fullband (20kHz bandpass)
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_bandwidth(const unsigned char *data) OPUS_ARG_NONNULL(1);
+
+/** Gets the number of samples per frame from an Opus packet.
+ * @param [in] data char*: Opus packet.
+ * This must contain at least one byte of
+ * data.
+ * @param [in] Fs opus_int32: Sampling rate in Hz.
+ * This must be a multiple of 400, or
+ * inaccurate results will be returned.
+ * @returns Number of samples per frame.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_samples_per_frame(const unsigned char *data, opus_int32 Fs) OPUS_ARG_NONNULL(1);
+
+/** Gets the number of channels from an Opus packet.
+ * @param [in] data char*: Opus packet
+ * @returns Number of channels
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_nb_channels(const unsigned char *data) OPUS_ARG_NONNULL(1);
+
+/** Gets the number of frames in an Opus packet.
+ * @param [in] packet char*: Opus packet
+ * @param [in] len opus_int32: Length of packet
+ * @returns Number of frames
+ * @retval OPUS_BAD_ARG Insufficient data was passed to the function
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_nb_frames(const unsigned char packet[], opus_int32 len) OPUS_ARG_NONNULL(1);
+
+/** Gets the number of samples of an Opus packet.
+ * @param [in] packet char*: Opus packet
+ * @param [in] len opus_int32: Length of packet
+ * @param [in] Fs opus_int32: Sampling rate in Hz.
+ * This must be a multiple of 400, or
+ * inaccurate results will be returned.
+ * @returns Number of samples
+ * @retval OPUS_BAD_ARG Insufficient data was passed to the function
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_nb_samples(const unsigned char packet[], opus_int32 len, opus_int32 Fs) OPUS_ARG_NONNULL(1);
+
+/** Checks whether an Opus packet has LBRR.
+ * @param [in] packet char*: Opus packet
+ * @param [in] len opus_int32: Length of packet
+ * @returns 1 is LBRR is present, 0 otherwise
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_has_lbrr(const unsigned char packet[], opus_int32 len);
+
+/** Gets the number of samples of an Opus packet.
+ * @param [in] dec OpusDecoder*: Decoder state
+ * @param [in] packet char*: Opus packet
+ * @param [in] len opus_int32: Length of packet
+ * @returns Number of samples
+ * @retval OPUS_BAD_ARG Insufficient data was passed to the function
+ * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decoder_get_nb_samples(const OpusDecoder *dec, const unsigned char packet[], opus_int32 len) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
+
+/** Applies soft-clipping to bring a float signal within the [-1,1] range. If
+ * the signal is already in that range, nothing is done. If there are values
+ * outside of [-1,1], then the signal is clipped as smoothly as possible to
+ * both fit in the range and avoid creating excessive distortion in the
+ * process.
+ * @param [in,out] pcm float*: Input PCM and modified PCM
+ * @param [in] frame_size int Number of samples per channel to process
+ * @param [in] channels int: Number of channels
+ * @param [in,out] softclip_mem float*: State memory for the soft clipping process (one float per channel, initialized to zero)
+ */
+OPUS_EXPORT void opus_pcm_soft_clip(float *pcm, int frame_size, int channels, float *softclip_mem);
+
+
+/**@}*/
+
+/** @defgroup opus_repacketizer Repacketizer
+ * @{
+ *
+ * The repacketizer can be used to merge multiple Opus packets into a single
+ * packet or alternatively to split Opus packets that have previously been
+ * merged. Splitting valid Opus packets is always guaranteed to succeed,
+ * whereas merging valid packets only succeeds if all frames have the same
+ * mode, bandwidth, and frame size, and when the total duration of the merged
+ * packet is no more than 120 ms. The 120 ms limit comes from the
+ * specification and limits decoder memory requirements at a point where
+ * framing overhead becomes negligible.
+ *
+ * The repacketizer currently only operates on elementary Opus
+ * streams. It will not manipulate multistream packets successfully, except in
+ * the degenerate case where they consist of data from a single stream.
+ *
+ * The repacketizing process starts with creating a repacketizer state, either
+ * by calling opus_repacketizer_create() or by allocating the memory yourself,
+ * e.g.,
+ * @code
+ * OpusRepacketizer *rp;
+ * rp = (OpusRepacketizer*)malloc(opus_repacketizer_get_size());
+ * if (rp != NULL)
+ * opus_repacketizer_init(rp);
+ * @endcode
+ *
+ * Then the application should submit packets with opus_repacketizer_cat(),
+ * extract new packets with opus_repacketizer_out() or
+ * opus_repacketizer_out_range(), and then reset the state for the next set of
+ * input packets via opus_repacketizer_init().
+ *
+ * For example, to split a sequence of packets into individual frames:
+ * @code
+ * unsigned char *data;
+ * int len;
+ * while (get_next_packet(&data, &len))
+ * {
+ * unsigned char out[1276];
+ * opus_int32 out_len;
+ * int nb_frames;
+ * int err;
+ * int i;
+ * err = opus_repacketizer_cat(rp, data, len);
+ * if (err != OPUS_OK)
+ * {
+ * release_packet(data);
+ * return err;
+ * }
+ * nb_frames = opus_repacketizer_get_nb_frames(rp);
+ * for (i = 0; i < nb_frames; i++)
+ * {
+ * out_len = opus_repacketizer_out_range(rp, i, i+1, out, sizeof(out));
+ * if (out_len < 0)
+ * {
+ * release_packet(data);
+ * return (int)out_len;
+ * }
+ * output_next_packet(out, out_len);
+ * }
+ * opus_repacketizer_init(rp);
+ * release_packet(data);
+ * }
+ * @endcode
+ *
+ * Alternatively, to combine a sequence of frames into packets that each
+ * contain up to TARGET_DURATION_MS milliseconds of data:
+ * @code
+ * // The maximum number of packets with duration TARGET_DURATION_MS occurs
+ * // when the frame size is 2.5 ms, for a total of (TARGET_DURATION_MS*2/5)
+ * // packets.
+ * unsigned char *data[(TARGET_DURATION_MS*2/5)+1];
+ * opus_int32 len[(TARGET_DURATION_MS*2/5)+1];
+ * int nb_packets;
+ * unsigned char out[1277*(TARGET_DURATION_MS*2/2)];
+ * opus_int32 out_len;
+ * int prev_toc;
+ * nb_packets = 0;
+ * while (get_next_packet(data+nb_packets, len+nb_packets))
+ * {
+ * int nb_frames;
+ * int err;
+ * nb_frames = opus_packet_get_nb_frames(data[nb_packets], len[nb_packets]);
+ * if (nb_frames < 1)
+ * {
+ * release_packets(data, nb_packets+1);
+ * return nb_frames;
+ * }
+ * nb_frames += opus_repacketizer_get_nb_frames(rp);
+ * // If adding the next packet would exceed our target, or it has an
+ * // incompatible TOC sequence, output the packets we already have before
+ * // submitting it.
+ * // N.B., The nb_packets > 0 check ensures we've submitted at least one
+ * // packet since the last call to opus_repacketizer_init(). Otherwise a
+ * // single packet longer than TARGET_DURATION_MS would cause us to try to
+ * // output an (invalid) empty packet. It also ensures that prev_toc has
+ * // been set to a valid value. Additionally, len[nb_packets] > 0 is
+ * // guaranteed by the call to opus_packet_get_nb_frames() above, so the
+ * // reference to data[nb_packets][0] should be valid.
+ * if (nb_packets > 0 && (
+ * ((prev_toc & 0xFC) != (data[nb_packets][0] & 0xFC)) ||
+ * opus_packet_get_samples_per_frame(data[nb_packets], 48000)*nb_frames >
+ * TARGET_DURATION_MS*48))
+ * {
+ * out_len = opus_repacketizer_out(rp, out, sizeof(out));
+ * if (out_len < 0)
+ * {
+ * release_packets(data, nb_packets+1);
+ * return (int)out_len;
+ * }
+ * output_next_packet(out, out_len);
+ * opus_repacketizer_init(rp);
+ * release_packets(data, nb_packets);
+ * data[0] = data[nb_packets];
+ * len[0] = len[nb_packets];
+ * nb_packets = 0;
+ * }
+ * err = opus_repacketizer_cat(rp, data[nb_packets], len[nb_packets]);
+ * if (err != OPUS_OK)
+ * {
+ * release_packets(data, nb_packets+1);
+ * return err;
+ * }
+ * prev_toc = data[nb_packets][0];
+ * nb_packets++;
+ * }
+ * // Output the final, partial packet.
+ * if (nb_packets > 0)
+ * {
+ * out_len = opus_repacketizer_out(rp, out, sizeof(out));
+ * release_packets(data, nb_packets);
+ * if (out_len < 0)
+ * return (int)out_len;
+ * output_next_packet(out, out_len);
+ * }
+ * @endcode
+ *
+ * An alternate way of merging packets is to simply call opus_repacketizer_cat()
+ * unconditionally until it fails. At that point, the merged packet can be
+ * obtained with opus_repacketizer_out() and the input packet for which
+ * opus_repacketizer_cat() needs to be re-added to a newly reinitialized
+ * repacketizer state.
+ */
+
+typedef struct OpusRepacketizer OpusRepacketizer;
+
+/** Gets the size of an OpusRepacketizer structure.
+ * @returns The size in bytes.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_repacketizer_get_size(void);
+
+/** (Re)initializes a previously allocated repacketizer state.
+ * The state must be at least the size returned by opus_repacketizer_get_size().
+ * This can be used for applications which use their own allocator instead of
+ * malloc().
+ * It must also be called to reset the queue of packets waiting to be
+ * repacketized, which is necessary if the maximum packet duration of 120 ms
+ * is reached or if you wish to submit packets with a different Opus
+ * configuration (coding mode, audio bandwidth, frame size, or channel count).
+ * Failure to do so will prevent a new packet from being added with
+ * opus_repacketizer_cat().
+ * @see opus_repacketizer_create
+ * @see opus_repacketizer_get_size
+ * @see opus_repacketizer_cat
+ * @param rp OpusRepacketizer*: The repacketizer state to
+ * (re)initialize.
+ * @returns A pointer to the same repacketizer state that was passed in.
+ */
+OPUS_EXPORT OpusRepacketizer *opus_repacketizer_init(OpusRepacketizer *rp) OPUS_ARG_NONNULL(1);
+
+/** Allocates memory and initializes the new repacketizer with
+ * opus_repacketizer_init().
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusRepacketizer *opus_repacketizer_create(void);
+
+/** Frees an OpusRepacketizer allocated by
+ * opus_repacketizer_create().
+ * @param[in] rp OpusRepacketizer*: State to be freed.
+ */
+OPUS_EXPORT void opus_repacketizer_destroy(OpusRepacketizer *rp);
+
+/** Add a packet to the current repacketizer state.
+ * This packet must match the configuration of any packets already submitted
+ * for repacketization since the last call to opus_repacketizer_init().
+ * This means that it must have the same coding mode, audio bandwidth, frame
+ * size, and channel count.
+ * This can be checked in advance by examining the top 6 bits of the first
+ * byte of the packet, and ensuring they match the top 6 bits of the first
+ * byte of any previously submitted packet.
+ * The total duration of audio in the repacketizer state also must not exceed
+ * 120 ms, the maximum duration of a single packet, after adding this packet.
+ *
+ * The contents of the current repacketizer state can be extracted into new
+ * packets using opus_repacketizer_out() or opus_repacketizer_out_range().
+ *
+ * In order to add a packet with a different configuration or to add more
+ * audio beyond 120 ms, you must clear the repacketizer state by calling
+ * opus_repacketizer_init().
+ * If a packet is too large to add to the current repacketizer state, no part
+ * of it is added, even if it contains multiple frames, some of which might
+ * fit.
+ * If you wish to be able to add parts of such packets, you should first use
+ * another repacketizer to split the packet into pieces and add them
+ * individually.
+ * @see opus_repacketizer_out_range
+ * @see opus_repacketizer_out
+ * @see opus_repacketizer_init
+ * @param rp OpusRepacketizer*: The repacketizer state to which to
+ * add the packet.
+ * @param[in] data const unsigned char*: The packet data.
+ * The application must ensure
+ * this pointer remains valid
+ * until the next call to
+ * opus_repacketizer_init() or
+ * opus_repacketizer_destroy().
+ * @param len opus_int32: The number of bytes in the packet data.
+ * @returns An error code indicating whether or not the operation succeeded.
+ * @retval #OPUS_OK The packet's contents have been added to the repacketizer
+ * state.
+ * @retval #OPUS_INVALID_PACKET The packet did not have a valid TOC sequence,
+ * the packet's TOC sequence was not compatible
+ * with previously submitted packets (because
+ * the coding mode, audio bandwidth, frame size,
+ * or channel count did not match), or adding
+ * this packet would increase the total amount of
+ * audio stored in the repacketizer state to more
+ * than 120 ms.
+ */
+OPUS_EXPORT int opus_repacketizer_cat(OpusRepacketizer *rp, const unsigned char *data, opus_int32 len) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
+
+
+/** Construct a new packet from data previously submitted to the repacketizer
+ * state via opus_repacketizer_cat().
+ * @param rp OpusRepacketizer*: The repacketizer state from which to
+ * construct the new packet.
+ * @param begin int: The index of the first frame in the current
+ * repacketizer state to include in the output.
+ * @param end int: One past the index of the last frame in the
+ * current repacketizer state to include in the
+ * output.
+ * @param[out] data const unsigned char*: The buffer in which to
+ * store the output packet.
+ * @param maxlen opus_int32: The maximum number of bytes to store in
+ * the output buffer. In order to guarantee
+ * success, this should be at least
+ * 1276 for a single frame,
+ * or for multiple frames,
+ * 1277*(end-begin).
+ * However, 1*(end-begin) plus
+ * the size of all packet data submitted to
+ * the repacketizer since the last call to
+ * opus_repacketizer_init() or
+ * opus_repacketizer_create() is also
+ * sufficient, and possibly much smaller.
+ * @returns The total size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BAD_ARG [begin,end) was an invalid range of
+ * frames (begin < 0, begin >= end, or end >
+ * opus_repacketizer_get_nb_frames()).
+ * @retval #OPUS_BUFFER_TOO_SMALL \a maxlen was insufficient to contain the
+ * complete output packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_repacketizer_out_range(OpusRepacketizer *rp, int begin, int end, unsigned char *data, opus_int32 maxlen) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Return the total number of frames contained in packet data submitted to
+ * the repacketizer state so far via opus_repacketizer_cat() since the last
+ * call to opus_repacketizer_init() or opus_repacketizer_create().
+ * This defines the valid range of packets that can be extracted with
+ * opus_repacketizer_out_range() or opus_repacketizer_out().
+ * @param rp OpusRepacketizer*: The repacketizer state containing the
+ * frames.
+ * @returns The total number of frames contained in the packet data submitted
+ * to the repacketizer state.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_repacketizer_get_nb_frames(OpusRepacketizer *rp) OPUS_ARG_NONNULL(1);
+
+/** Construct a new packet from data previously submitted to the repacketizer
+ * state via opus_repacketizer_cat().
+ * This is a convenience routine that returns all the data submitted so far
+ * in a single packet.
+ * It is equivalent to calling
+ * @code
+ * opus_repacketizer_out_range(rp, 0, opus_repacketizer_get_nb_frames(rp),
+ * data, maxlen)
+ * @endcode
+ * @param rp OpusRepacketizer*: The repacketizer state from which to
+ * construct the new packet.
+ * @param[out] data const unsigned char*: The buffer in which to
+ * store the output packet.
+ * @param maxlen opus_int32: The maximum number of bytes to store in
+ * the output buffer. In order to guarantee
+ * success, this should be at least
+ * 1277*opus_repacketizer_get_nb_frames(rp).
+ * However,
+ * 1*opus_repacketizer_get_nb_frames(rp)
+ * plus the size of all packet data
+ * submitted to the repacketizer since the
+ * last call to opus_repacketizer_init() or
+ * opus_repacketizer_create() is also
+ * sufficient, and possibly much smaller.
+ * @returns The total size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BUFFER_TOO_SMALL \a maxlen was insufficient to contain the
+ * complete output packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_repacketizer_out(OpusRepacketizer *rp, unsigned char *data, opus_int32 maxlen) OPUS_ARG_NONNULL(1);
+
+/** Pads a given Opus packet to a larger size (possibly changing the TOC sequence).
+ * @param[in,out] data const unsigned char*: The buffer containing the
+ * packet to pad.
+ * @param len opus_int32: The size of the packet.
+ * This must be at least 1.
+ * @param new_len opus_int32: The desired size of the packet after padding.
+ * This must be at least as large as len.
+ * @returns an error code
+ * @retval #OPUS_OK \a on success.
+ * @retval #OPUS_BAD_ARG \a len was less than 1 or new_len was less than len.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT int opus_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len);
+
+/** Remove all padding from a given Opus packet and rewrite the TOC sequence to
+ * minimize space usage.
+ * @param[in,out] data const unsigned char*: The buffer containing the
+ * packet to strip.
+ * @param len opus_int32: The size of the packet.
+ * This must be at least 1.
+ * @returns The new size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BAD_ARG \a len was less than 1.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_packet_unpad(unsigned char *data, opus_int32 len);
+
+/** Pads a given Opus multi-stream packet to a larger size (possibly changing the TOC sequence).
+ * @param[in,out] data const unsigned char*: The buffer containing the
+ * packet to pad.
+ * @param len opus_int32: The size of the packet.
+ * This must be at least 1.
+ * @param new_len opus_int32: The desired size of the packet after padding.
+ * This must be at least 1.
+ * @param nb_streams opus_int32: The number of streams (not channels) in the packet.
+ * This must be at least as large as len.
+ * @returns an error code
+ * @retval #OPUS_OK \a on success.
+ * @retval #OPUS_BAD_ARG \a len was less than 1.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT int opus_multistream_packet_pad(unsigned char *data, opus_int32 len, opus_int32 new_len, int nb_streams);
+
+/** Remove all padding from a given Opus multi-stream packet and rewrite the TOC sequence to
+ * minimize space usage.
+ * @param[in,out] data const unsigned char*: The buffer containing the
+ * packet to strip.
+ * @param len opus_int32: The size of the packet.
+ * This must be at least 1.
+ * @param nb_streams opus_int32: The number of streams (not channels) in the packet.
+ * This must be at least 1.
+ * @returns The new size of the output packet on success, or an error code
+ * on failure.
+ * @retval #OPUS_BAD_ARG \a len was less than 1 or new_len was less than len.
+ * @retval #OPUS_INVALID_PACKET \a data did not contain a valid Opus packet.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_packet_unpad(unsigned char *data, opus_int32 len, int nb_streams);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* OPUS_H */
diff --git a/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_custom.h b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_custom.h
new file mode 100644
index 0000000..128650f
--- /dev/null
+++ b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_custom.h
@@ -0,0 +1,381 @@
+/* Copyright (c) 2007-2008 CSIRO
+ Copyright (c) 2007-2009 Xiph.Org Foundation
+ Copyright (c) 2008-2012 Gregory Maxwell
+ Written by Jean-Marc Valin and Gregory Maxwell */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ @file opus_custom.h
+ @brief Opus-Custom reference implementation API
+ */
+
+#ifndef OPUS_CUSTOM_H
+#define OPUS_CUSTOM_H
+
+#include "opus_defines.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(CUSTOM_MODES) || defined(ENABLE_OPUS_CUSTOM_API)
+# define OPUS_CUSTOM_EXPORT OPUS_EXPORT
+# define OPUS_CUSTOM_EXPORT_STATIC OPUS_EXPORT
+#else
+# define OPUS_CUSTOM_EXPORT
+# ifdef OPUS_BUILD
+# define OPUS_CUSTOM_EXPORT_STATIC static OPUS_INLINE
+# else
+# define OPUS_CUSTOM_EXPORT_STATIC
+# endif
+#endif
+
+/** @defgroup opus_custom Opus Custom
+ * @{
+ * Opus Custom is an optional part of the Opus specification and
+ * reference implementation which uses a distinct API from the regular
+ * API and supports frame sizes that are not normally supported.\ Use
+ * of Opus Custom is discouraged for all but very special applications
+ * for which a frame size different from 2.5, 5, 10, or 20 ms is needed
+ * (for either complexity or latency reasons) and where interoperability
+ * is less important.
+ *
+ * In addition to the interoperability limitations the use of Opus custom
+ * disables a substantial chunk of the codec and generally lowers the
+ * quality available at a given bitrate. Normally when an application needs
+ * a different frame size from the codec it should buffer to match the
+ * sizes but this adds a small amount of delay which may be important
+ * in some very low latency applications. Some transports (especially
+ * constant rate RF transports) may also work best with frames of
+ * particular durations.
+ *
+ * Libopus only supports custom modes if they are enabled at compile time.
+ *
+ * The Opus Custom API is similar to the regular API but the
+ * @ref opus_encoder_create and @ref opus_decoder_create calls take
+ * an additional mode parameter which is a structure produced by
+ * a call to @ref opus_custom_mode_create. Both the encoder and decoder
+ * must create a mode using the same sample rate (fs) and frame size
+ * (frame size) so these parameters must either be signaled out of band
+ * or fixed in a particular implementation.
+ *
+ * Similar to regular Opus the custom modes support on the fly frame size
+ * switching, but the sizes available depend on the particular frame size in
+ * use. For some initial frame sizes on a single on the fly size is available.
+ */
+
+/** Contains the state of an encoder. One encoder state is needed
+ for each stream. It is initialized once at the beginning of the
+ stream. Do *not* re-initialize the state for every frame.
+ @brief Encoder state
+ */
+typedef struct OpusCustomEncoder OpusCustomEncoder;
+
+/** State of the decoder. One decoder state is needed for each stream.
+ It is initialized once at the beginning of the stream. Do *not*
+ re-initialize the state for every frame.
+ @brief Decoder state
+ */
+typedef struct OpusCustomDecoder OpusCustomDecoder;
+
+/** The mode contains all the information necessary to create an
+ encoder. Both the encoder and decoder need to be initialized
+ with exactly the same mode, otherwise the output will be
+ corrupted. The mode MUST NOT BE DESTROYED until the encoders and
+ decoders that use it are destroyed as well.
+ @brief Mode configuration
+ */
+typedef struct OpusCustomMode OpusCustomMode;
+
+/** Creates a new mode struct. This will be passed to an encoder or
+ * decoder. The mode MUST NOT BE DESTROYED until the encoders and
+ * decoders that use it are destroyed as well.
+ * @param [in] Fs int: Sampling rate (8000 to 96000 Hz)
+ * @param [in] frame_size int: Number of samples (per channel) to encode in each
+ * packet (64 - 1024, prime factorization must contain zero or more 2s, 3s, or 5s and no other primes)
+ * @param [out] error int*: Returned error code (if NULL, no error will be returned)
+ * @return A newly created mode
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error);
+
+/** Destroys a mode struct. Only call this after all encoders and
+ * decoders using this mode are destroyed as well.
+ * @param [in] mode OpusCustomMode*: Mode to be freed.
+ */
+OPUS_CUSTOM_EXPORT void opus_custom_mode_destroy(OpusCustomMode *mode);
+
+
+#if !defined(OPUS_BUILD) || defined(CELT_ENCODER_C)
+
+/* Encoder */
+/** Gets the size of an OpusCustomEncoder structure.
+ * @param [in] mode OpusCustomMode *: Mode configuration
+ * @param [in] channels int: Number of channels
+ * @returns size
+ */
+OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_encoder_get_size(
+ const OpusCustomMode *mode,
+ int channels
+) OPUS_ARG_NONNULL(1);
+
+#if defined(CUSTOM_MODES) || defined(ENABLE_OPUS_CUSTOM_API)
+/** Initializes a previously allocated encoder state
+ * The memory pointed to by st must be the size returned by opus_custom_encoder_get_size.
+ * This is intended for applications which use their own allocator instead of malloc.
+ * @see opus_custom_encoder_create(),opus_custom_encoder_get_size()
+ * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
+ * @param [in] st OpusCustomEncoder*: Encoder state
+ * @param [in] mode OpusCustomMode *: Contains all the information about the characteristics of
+ * the stream (must be the same characteristics as used for the
+ * decoder)
+ * @param [in] channels int: Number of channels
+ * @return OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_CUSTOM_EXPORT int opus_custom_encoder_init(
+ OpusCustomEncoder *st,
+ const OpusCustomMode *mode,
+ int channels
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
+# endif
+#endif
+
+
+/** Creates a new encoder state. Each stream needs its own encoder
+ * state (can't be shared across simultaneous streams).
+ * @param [in] mode OpusCustomMode*: Contains all the information about the characteristics of
+ * the stream (must be the same characteristics as used for the
+ * decoder)
+ * @param [in] channels int: Number of channels
+ * @param [out] error int*: Returns an error code
+ * @return Newly created encoder state.
+*/
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomEncoder *opus_custom_encoder_create(
+ const OpusCustomMode *mode,
+ int channels,
+ int *error
+) OPUS_ARG_NONNULL(1);
+
+
+/** Destroys an encoder state.
+ * @param[in] st OpusCustomEncoder*: State to be freed.
+ */
+OPUS_CUSTOM_EXPORT void opus_custom_encoder_destroy(OpusCustomEncoder *st);
+
+/** Encodes a frame of audio.
+ * @param [in] st OpusCustomEncoder*: Encoder state
+ * @param [in] pcm float*: PCM audio in float format, with a normal range of +/-1.0.
+ * Samples with a range beyond +/-1.0 are supported but will
+ * be clipped by decoders using the integer API and should
+ * only be used if it is known that the far end supports
+ * extended dynamic range. There must be exactly
+ * frame_size samples per channel.
+ * @param [in] frame_size int: Number of samples per frame of input signal
+ * @param [out] compressed char *: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
+ * @param [in] maxCompressedBytes int: Maximum number of bytes to use for compressing the frame
+ * (can change from one frame to another)
+ * @return Number of bytes written to "compressed".
+ * If negative, an error has occurred (see error codes). It is IMPORTANT that
+ * the length returned be somehow transmitted to the decoder. Otherwise, no
+ * decoding is possible.
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode_float(
+ OpusCustomEncoder *st,
+ const float *pcm,
+ int frame_size,
+ unsigned char *compressed,
+ int maxCompressedBytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes a frame of audio.
+ * @param [in] st OpusCustomEncoder*: Encoder state
+ * @param [in] pcm opus_int16*: PCM audio in signed 16-bit format (native endian).
+ * There must be exactly frame_size samples per channel.
+ * @param [in] frame_size int: Number of samples per frame of input signal
+ * @param [out] compressed char *: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
+ * @param [in] maxCompressedBytes int: Maximum number of bytes to use for compressing the frame
+ * (can change from one frame to another)
+ * @return Number of bytes written to "compressed".
+ * If negative, an error has occurred (see error codes). It is IMPORTANT that
+ * the length returned be somehow transmitted to the decoder. Otherwise, no
+ * decoding is possible.
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode(
+ OpusCustomEncoder *st,
+ const opus_int16 *pcm,
+ int frame_size,
+ unsigned char *compressed,
+ int maxCompressedBytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes a frame of audio.
+ * @param [in] st OpusCustomEncoder*: Encoder state
+ * @param [in] pcm opus_int32*: PCM audio in signed 32-bit format (native endian) representing (or slightly exceeding) 24-bit values.
+ * There must be exactly frame_size samples per channel.
+ * @param [in] frame_size int: Number of samples per frame of input signal
+ * @param [out] compressed char *: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
+ * @param [in] maxCompressedBytes int: Maximum number of bytes to use for compressing the frame
+ * (can change from one frame to another)
+ * @return Number of bytes written to "compressed".
+ * If negative, an error has occurred (see error codes). It is IMPORTANT that
+ * the length returned be somehow transmitted to the decoder. Otherwise, no
+ * decoding is possible.
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_encode24(
+ OpusCustomEncoder *st,
+ const opus_int32 *pcm,
+ int frame_size,
+ unsigned char *compressed,
+ int maxCompressedBytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Perform a CTL function on an Opus custom encoder.
+ *
+ * Generally the request and subsequent arguments are generated
+ * by a convenience macro.
+ * @see opus_encoderctls
+ */
+OPUS_CUSTOM_EXPORT int opus_custom_encoder_ctl(OpusCustomEncoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
+
+
+#if !defined(OPUS_BUILD) || defined(CELT_DECODER_C)
+/* Decoder */
+
+/** Gets the size of an OpusCustomDecoder structure.
+ * @param [in] mode OpusCustomMode *: Mode configuration
+ * @param [in] channels int: Number of channels
+ * @returns size
+ */
+OPUS_CUSTOM_EXPORT_STATIC OPUS_WARN_UNUSED_RESULT int opus_custom_decoder_get_size(
+ const OpusCustomMode *mode,
+ int channels
+) OPUS_ARG_NONNULL(1);
+
+/** Initializes a previously allocated decoder state
+ * The memory pointed to by st must be the size returned by opus_custom_decoder_get_size.
+ * This is intended for applications which use their own allocator instead of malloc.
+ * @see opus_custom_decoder_create(),opus_custom_decoder_get_size()
+ * To reset a previously initialized state use the OPUS_RESET_STATE CTL.
+ * @param [in] st OpusCustomDecoder*: Decoder state
+ * @param [in] mode OpusCustomMode *: Contains all the information about the characteristics of
+ * the stream (must be the same characteristics as used for the
+ * encoder)
+ * @param [in] channels int: Number of channels
+ * @return OPUS_OK Success or @ref opus_errorcodes
+ */
+OPUS_CUSTOM_EXPORT_STATIC int opus_custom_decoder_init(
+ OpusCustomDecoder *st,
+ const OpusCustomMode *mode,
+ int channels
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
+
+#endif
+
+
+/** Creates a new decoder state. Each stream needs its own decoder state (can't
+ * be shared across simultaneous streams).
+ * @param [in] mode OpusCustomMode: Contains all the information about the characteristics of the
+ * stream (must be the same characteristics as used for the encoder)
+ * @param [in] channels int: Number of channels
+ * @param [out] error int*: Returns an error code
+ * @return Newly created decoder state.
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT OpusCustomDecoder *opus_custom_decoder_create(
+ const OpusCustomMode *mode,
+ int channels,
+ int *error
+) OPUS_ARG_NONNULL(1);
+
+/** Destroys a decoder state.
+ * @param[in] st OpusCustomDecoder*: State to be freed.
+ */
+OPUS_CUSTOM_EXPORT void opus_custom_decoder_destroy(OpusCustomDecoder *st);
+
+/** Decode an opus custom frame with floating point output
+ * @param [in] st OpusCustomDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len int: Number of bytes in payload
+ * @param [out] pcm float*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(float)
+ * @param [in] frame_size Number of samples per channel of available space in *pcm.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode_float(
+ OpusCustomDecoder *st,
+ const unsigned char *data,
+ int len,
+ float *pcm,
+ int frame_size
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode an opus custom frame
+ * @param [in] st OpusCustomDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len int: Number of bytes in payload
+ * @param [out] pcm opus_int16*: Output signal (interleaved if 2 channels). length
+ * is frame_size*channels*sizeof(opus_int16)
+ * @param [in] frame_size Number of samples per channel of available space in *pcm.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode(
+ OpusCustomDecoder *st,
+ const unsigned char *data,
+ int len,
+ opus_int16 *pcm,
+ int frame_size
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode an opus custom frame
+ * @param [in] st OpusCustomDecoder*: Decoder state
+ * @param [in] data char*: Input payload. Use a NULL pointer to indicate packet loss
+ * @param [in] len int: Number of bytes in payload
+ * @param [out] pcm opus_int32*: Output signal (interleaved if 2 channels) representing (or slightly exceeding) 24-bit values. length
+ * is frame_size*channels*sizeof(opus_int32)
+ * @param [in] frame_size Number of samples per channel of available space in *pcm.
+ * @returns Number of decoded samples or @ref opus_errorcodes
+ */
+OPUS_CUSTOM_EXPORT OPUS_WARN_UNUSED_RESULT int opus_custom_decode24(
+ OpusCustomDecoder *st,
+ const unsigned char *data,
+ int len,
+ opus_int32 *pcm,
+ int frame_size
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Perform a CTL function on an Opus custom decoder.
+ *
+ * Generally the request and subsequent arguments are generated
+ * by a convenience macro.
+ * @see opus_genericctls
+ */
+OPUS_CUSTOM_EXPORT int opus_custom_decoder_ctl(OpusCustomDecoder * OPUS_RESTRICT st, int request, ...) OPUS_ARG_NONNULL(1);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* OPUS_CUSTOM_H */
diff --git a/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_defines.h b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_defines.h
new file mode 100644
index 0000000..4a61406
--- /dev/null
+++ b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_defines.h
@@ -0,0 +1,867 @@
+/* Copyright (c) 2010-2011 Xiph.Org Foundation, Skype Limited
+ Written by Jean-Marc Valin and Koen Vos */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ * @file opus_defines.h
+ * @brief Opus reference implementation constants
+ */
+
+#ifndef OPUS_DEFINES_H
+#define OPUS_DEFINES_H
+
+#include "opus_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @defgroup opus_errorcodes Error codes
+ * @{
+ */
+/** No error @hideinitializer*/
+#define OPUS_OK 0
+/** One or more invalid/out of range arguments @hideinitializer*/
+#define OPUS_BAD_ARG -1
+/** Not enough bytes allocated in the buffer @hideinitializer*/
+#define OPUS_BUFFER_TOO_SMALL -2
+/** An internal error was detected @hideinitializer*/
+#define OPUS_INTERNAL_ERROR -3
+/** The compressed data passed is corrupted @hideinitializer*/
+#define OPUS_INVALID_PACKET -4
+/** Invalid/unsupported request number @hideinitializer*/
+#define OPUS_UNIMPLEMENTED -5
+/** An encoder or decoder structure is invalid or already freed @hideinitializer*/
+#define OPUS_INVALID_STATE -6
+/** Memory allocation has failed @hideinitializer*/
+#define OPUS_ALLOC_FAIL -7
+/**@}*/
+
+/** @cond OPUS_INTERNAL_DOC */
+/**Export control for opus functions */
+
+#ifndef OPUS_EXPORT
+# if defined(_WIN32)
+# if defined(OPUS_BUILD) && defined(DLL_EXPORT)
+# define OPUS_EXPORT __declspec(dllexport)
+# else
+# define OPUS_EXPORT
+# endif
+# elif defined(__GNUC__) && defined(OPUS_BUILD)
+# define OPUS_EXPORT __attribute__ ((visibility ("default")))
+# else
+# define OPUS_EXPORT
+# endif
+#endif
+
+# if !defined(OPUS_GNUC_PREREQ)
+# if defined(__GNUC__)&&defined(__GNUC_MINOR__)
+# define OPUS_GNUC_PREREQ(_maj,_min) \
+ ((__GNUC__<<16)+__GNUC_MINOR__>=((_maj)<<16)+(_min))
+# else
+# define OPUS_GNUC_PREREQ(_maj,_min) 0
+# endif
+# endif
+
+#if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
+# if OPUS_GNUC_PREREQ(3,0)
+# define OPUS_RESTRICT __restrict__
+# elif (defined(_MSC_VER) && _MSC_VER >= 1400)
+# define OPUS_RESTRICT __restrict
+# else
+# define OPUS_RESTRICT
+# endif
+#else
+# define OPUS_RESTRICT restrict
+#endif
+
+#if (!defined(__STDC_VERSION__) || (__STDC_VERSION__ < 199901L) )
+# if OPUS_GNUC_PREREQ(2,7)
+# define OPUS_INLINE __inline__
+# elif (defined(_MSC_VER))
+# define OPUS_INLINE __inline
+# else
+# define OPUS_INLINE
+# endif
+#else
+# define OPUS_INLINE inline
+#endif
+
+/**Warning attributes for opus functions
+ * NONNULL is not used in OPUS_BUILD to avoid the compiler optimizing out
+ * some paranoid null checks. */
+#if defined(__GNUC__) && OPUS_GNUC_PREREQ(3, 4)
+# define OPUS_WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
+#else
+# define OPUS_WARN_UNUSED_RESULT
+#endif
+#if !defined(OPUS_BUILD) && defined(__GNUC__) && OPUS_GNUC_PREREQ(3, 4)
+# define OPUS_ARG_NONNULL(_x) __attribute__ ((__nonnull__(_x)))
+#else
+# define OPUS_ARG_NONNULL(_x)
+#endif
+
+/** These are the actual Encoder CTL ID numbers.
+ * They should not be used directly by applications.
+ * In general, SETs should be even and GETs should be odd.*/
+#define OPUS_SET_APPLICATION_REQUEST 4000
+#define OPUS_GET_APPLICATION_REQUEST 4001
+#define OPUS_SET_BITRATE_REQUEST 4002
+#define OPUS_GET_BITRATE_REQUEST 4003
+#define OPUS_SET_MAX_BANDWIDTH_REQUEST 4004
+#define OPUS_GET_MAX_BANDWIDTH_REQUEST 4005
+#define OPUS_SET_VBR_REQUEST 4006
+#define OPUS_GET_VBR_REQUEST 4007
+#define OPUS_SET_BANDWIDTH_REQUEST 4008
+#define OPUS_GET_BANDWIDTH_REQUEST 4009
+#define OPUS_SET_COMPLEXITY_REQUEST 4010
+#define OPUS_GET_COMPLEXITY_REQUEST 4011
+#define OPUS_SET_INBAND_FEC_REQUEST 4012
+#define OPUS_GET_INBAND_FEC_REQUEST 4013
+#define OPUS_SET_PACKET_LOSS_PERC_REQUEST 4014
+#define OPUS_GET_PACKET_LOSS_PERC_REQUEST 4015
+#define OPUS_SET_DTX_REQUEST 4016
+#define OPUS_GET_DTX_REQUEST 4017
+#define OPUS_SET_VBR_CONSTRAINT_REQUEST 4020
+#define OPUS_GET_VBR_CONSTRAINT_REQUEST 4021
+#define OPUS_SET_FORCE_CHANNELS_REQUEST 4022
+#define OPUS_GET_FORCE_CHANNELS_REQUEST 4023
+#define OPUS_SET_SIGNAL_REQUEST 4024
+#define OPUS_GET_SIGNAL_REQUEST 4025
+#define OPUS_GET_LOOKAHEAD_REQUEST 4027
+/* #define OPUS_RESET_STATE 4028 */
+#define OPUS_GET_SAMPLE_RATE_REQUEST 4029
+#define OPUS_GET_FINAL_RANGE_REQUEST 4031
+#define OPUS_GET_PITCH_REQUEST 4033
+#define OPUS_SET_GAIN_REQUEST 4034
+#define OPUS_GET_GAIN_REQUEST 4045 /* Should have been 4035 */
+#define OPUS_SET_LSB_DEPTH_REQUEST 4036
+#define OPUS_GET_LSB_DEPTH_REQUEST 4037
+#define OPUS_GET_LAST_PACKET_DURATION_REQUEST 4039
+#define OPUS_SET_EXPERT_FRAME_DURATION_REQUEST 4040
+#define OPUS_GET_EXPERT_FRAME_DURATION_REQUEST 4041
+#define OPUS_SET_PREDICTION_DISABLED_REQUEST 4042
+#define OPUS_GET_PREDICTION_DISABLED_REQUEST 4043
+/* Don't use 4045, it's already taken by OPUS_GET_GAIN_REQUEST */
+#define OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 4046
+#define OPUS_GET_PHASE_INVERSION_DISABLED_REQUEST 4047
+#define OPUS_GET_IN_DTX_REQUEST 4049
+#define OPUS_SET_DRED_DURATION_REQUEST 4050
+#define OPUS_GET_DRED_DURATION_REQUEST 4051
+#define OPUS_SET_DNN_BLOB_REQUEST 4052
+/*#define OPUS_GET_DNN_BLOB_REQUEST 4053 */
+#define OPUS_SET_OSCE_BWE_REQUEST 4054
+#define OPUS_GET_OSCE_BWE_REQUEST 4055
+#define OPUS_SET_QEXT_REQUEST 4056
+#define OPUS_GET_QEXT_REQUEST 4057
+#define OPUS_SET_IGNORE_EXTENSIONS_REQUEST 4058
+#define OPUS_GET_IGNORE_EXTENSIONS_REQUEST 4059
+
+/** Defines for the presence of extended APIs. */
+#define OPUS_HAVE_OPUS_PROJECTION_H
+
+/* Macros to trigger compilation errors when the wrong types are provided to a CTL */
+#define opus_check_int(x) (((void)((x) == (opus_int32)0)), (opus_int32)(x))
+
+#ifdef DISABLE_PTR_CHECK
+/* Disable checks to prevent ubsan from complaining about NULL checks
+ in test_opus_api. */
+#define opus_check_int_ptr(ptr) (ptr)
+#define opus_check_uint_ptr(ptr) (ptr)
+#define opus_check_uint8_ptr(ptr) (ptr)
+#define opus_check_val16_ptr(ptr) (ptr)
+#define opus_check_void_ptr(ptr) (ptr)
+#else
+#define opus_check_int_ptr(ptr) ((ptr) + ((ptr) - (opus_int32*)(ptr)))
+#define opus_check_uint_ptr(ptr) ((ptr) + ((ptr) - (opus_uint32*)(ptr)))
+#define opus_check_uint8_ptr(ptr) ((ptr) + ((ptr) - (opus_uint8*)(ptr)))
+#define opus_check_val16_ptr(ptr) ((ptr) + ((ptr) - (opus_val16*)(ptr)))
+#define opus_check_void_ptr(x) ((void)((void *)0 == (x)), (x))
+#endif
+/** @endcond */
+
+/** @defgroup opus_ctlvalues Pre-defined values for CTL interface
+ * @see opus_genericctls, opus_encoderctls
+ * @{
+ */
+/* Values for the various encoder CTLs */
+#define OPUS_AUTO -1000 /**Fs value passed to opus_encoder_init()
+ * or opus_decoder_init().
+ * @param[out] x opus_int32 *: Sampling rate of encoder or decoder.
+ * @hideinitializer
+ */
+#define OPUS_GET_SAMPLE_RATE(x) OPUS_GET_SAMPLE_RATE_REQUEST, opus_check_int_ptr(x)
+
+/** If set to 1, disables the use of phase inversion for intensity stereo,
+ * improving the quality of mono downmixes, but slightly reducing normal
+ * stereo quality. Disabling phase inversion in the decoder does not comply
+ * with RFC 6716, although it does not cause any interoperability issue and
+ * is expected to become part of the Opus standard once RFC 6716 is updated
+ * by draft-ietf-codec-opus-update.
+ * @see OPUS_GET_PHASE_INVERSION_DISABLED
+ * @param[in] x opus_int32: Allowed values:
+ * streams parameter used
+ * to initialize the encoder.
+ * @param[out] y OpusEncoder**: Returns a pointer to the given
+ * encoder state.
+ * @retval OPUS_BAD_ARG The index of the requested stream was out of range.
+ * @hideinitializer
+ */
+#define OPUS_MULTISTREAM_GET_ENCODER_STATE(x,y) OPUS_MULTISTREAM_GET_ENCODER_STATE_REQUEST, opus_check_int(x), opus_check_encstate_ptr(y)
+
+/** Gets the decoder state for an individual stream of a multistream decoder.
+ * @param[in] x opus_int32: The index of the stream whose decoder you
+ * wish to retrieve.
+ * This must be non-negative and less than
+ * the streams parameter used
+ * to initialize the decoder.
+ * @param[out] y OpusDecoder**: Returns a pointer to the given
+ * decoder state.
+ * @retval OPUS_BAD_ARG The index of the requested stream was out of range.
+ * @hideinitializer
+ */
+#define OPUS_MULTISTREAM_GET_DECODER_STATE(x,y) OPUS_MULTISTREAM_GET_DECODER_STATE_REQUEST, opus_check_int(x), opus_check_decstate_ptr(y)
+
+/**@}*/
+
+/** @defgroup opus_multistream Opus Multistream API
+ * @{
+ *
+ * The multistream API allows individual Opus streams to be combined into a
+ * single packet, enabling support for up to 255 channels. Unlike an
+ * elementary Opus stream, the encoder and decoder must negotiate the channel
+ * configuration before the decoder can successfully interpret the data in the
+ * packets produced by the encoder. Some basic information, such as packet
+ * duration, can be computed without any special negotiation.
+ *
+ * The format for multistream Opus packets is defined in
+ * RFC 7845
+ * and is based on the self-delimited Opus framing described in Appendix B of
+ * RFC 6716.
+ * Normal Opus packets are just a degenerate case of multistream Opus packets,
+ * and can be encoded or decoded with the multistream API by setting
+ * streams to 1 when initializing the encoder or
+ * decoder.
+ *
+ * Multistream Opus streams can contain up to 255 elementary Opus streams.
+ * These may be either "uncoupled" or "coupled", indicating that the decoder
+ * is configured to decode them to either 1 or 2 channels, respectively.
+ * The streams are ordered so that all coupled streams appear at the
+ * beginning.
+ *
+ * A mapping table defines which decoded channel i
+ * should be used for each input/output (I/O) channel j. This table is
+ * typically provided as an unsigned char array.
+ * Let i = mapping[j] be the index for I/O channel j.
+ * If i < 2*coupled_streams, then I/O channel j is
+ * encoded as the left channel of stream (i/2) if i
+ * is even, or as the right channel of stream (i/2) if
+ * i is odd. Otherwise, I/O channel j is encoded as
+ * mono in stream (i - coupled_streams), unless it has the special
+ * value 255, in which case it is omitted from the encoding entirely (the
+ * decoder will reproduce it as silence). Each value i must either
+ * be the special value 255 or be less than streams + coupled_streams.
+ *
+ * The output channels specified by the encoder
+ * should use the
+ * Vorbis
+ * channel ordering. A decoder may wish to apply an additional permutation
+ * to the mapping the encoder used to achieve a different output channel
+ * order (e.g. for outputting in WAV order).
+ *
+ * Each multistream packet contains an Opus packet for each stream, and all of
+ * the Opus packets in a single multistream packet must have the same
+ * duration. Therefore the duration of a multistream packet can be extracted
+ * from the TOC sequence of the first stream, which is located at the
+ * beginning of the packet, just like an elementary Opus stream:
+ *
+ * @code
+ * int nb_samples;
+ * int nb_frames;
+ * nb_frames = opus_packet_get_nb_frames(data, len);
+ * if (nb_frames < 1)
+ * return nb_frames;
+ * nb_samples = opus_packet_get_samples_per_frame(data, 48000) * nb_frames;
+ * @endcode
+ *
+ * The general encoding and decoding process proceeds exactly the same as in
+ * the normal @ref opus_encoder and @ref opus_decoder APIs.
+ * See their documentation for an overview of how to use the corresponding
+ * multistream functions.
+ */
+
+/** Opus multistream encoder state.
+ * This contains the complete state of a multistream Opus encoder.
+ * It is position independent and can be freely copied.
+ * @see opus_multistream_encoder_create
+ * @see opus_multistream_encoder_init
+ */
+typedef struct OpusMSEncoder OpusMSEncoder;
+
+/** Opus multistream decoder state.
+ * This contains the complete state of a multistream Opus decoder.
+ * It is position independent and can be freely copied.
+ * @see opus_multistream_decoder_create
+ * @see opus_multistream_decoder_init
+ */
+typedef struct OpusMSDecoder OpusMSDecoder;
+
+/**\name Multistream encoder functions */
+/**@{*/
+
+/** Gets the size of an OpusMSEncoder structure.
+ * @param streams int: The total number of streams to encode from the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number of coupled (2 channel) streams
+ * to encode.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * encoded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @returns The size in bytes on success, or a negative error code
+ * (see @ref opus_errorcodes) on error.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_encoder_get_size(
+ int streams,
+ int coupled_streams
+);
+
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_surround_encoder_get_size(
+ int channels,
+ int mapping_family
+);
+
+
+/** Allocates and initializes a multistream encoder state.
+ * Call opus_multistream_encoder_destroy() to release
+ * this object when finished.
+ * @param Fs opus_int32: Sampling rate of the input signal (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels in the input signal.
+ * This must be at most 255.
+ * It may be greater than the number of
+ * coded channels (streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams to encode from the
+ * input.
+ * This must be no more than the number of channels.
+ * @param coupled_streams int: Number of coupled (2 channel) streams
+ * to encode.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * encoded channels (streams +
+ * coupled_streams) must be no
+ * more than the number of input channels.
+ * @param[in] mapping const unsigned char[channels]: Mapping from
+ * encoded channels to input channels, as described in
+ * @ref opus_multistream. As an extra constraint, the
+ * multistream encoder does not allow encoding coupled
+ * streams for which one channel is unused since this
+ * is never a good idea.
+ * @param application int: The target encoder application.
+ * This must be one of the following:
+ * streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams to encode from the
+ * input.
+ * This must be no more than the number of channels.
+ * @param coupled_streams int: Number of coupled (2 channel) streams
+ * to encode.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * encoded channels (streams +
+ * coupled_streams) must be no
+ * more than the number of input channels.
+ * @param[in] mapping const unsigned char[channels]: Mapping from
+ * encoded channels to input channels, as described in
+ * @ref opus_multistream. As an extra constraint, the
+ * multistream encoder does not allow encoding coupled
+ * streams for which one channel is unused since this
+ * is never a good idea.
+ * @param application int: The target encoder application.
+ * This must be one of the following:
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_encode(
+ OpusMSEncoder *st,
+ const opus_int16 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes a multistream Opus frame.
+ * @param st OpusMSEncoder*: Multistream encoder state.
+ * @param[in] pcm const opus_int32*: The input signal as interleaved
+ * samples representing (or slightly exceeding) 24-bit values.
+ * This must contain
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_encode24(
+ OpusMSEncoder *st,
+ const opus_int32 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes a multistream Opus frame from floating point input.
+ * @param st OpusMSEncoder*: Multistream encoder state.
+ * @param[in] pcm const float*: The input signal as interleaved
+ * samples with a normal range of
+ * +/-1.0.
+ * Samples with a range beyond +/-1.0
+ * are supported but will be clipped by
+ * decoders using the integer API and
+ * should only be used if it is known
+ * that the far end supports extended
+ * dynamic range.
+ * This must contain
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_encode_float(
+ OpusMSEncoder *st,
+ const float *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Frees an OpusMSEncoder allocated by
+ * opus_multistream_encoder_create().
+ * @param st OpusMSEncoder*: Multistream encoder state to be freed.
+ */
+OPUS_EXPORT void opus_multistream_encoder_destroy(OpusMSEncoder *st);
+
+/** Perform a CTL function on a multistream Opus encoder.
+ *
+ * Generally the request and subsequent arguments are generated by a
+ * convenience macro.
+ * @param st OpusMSEncoder*: Multistream encoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls,
+ * @ref opus_encoderctls, or @ref opus_multistream_ctls.
+ * @see opus_genericctls
+ * @see opus_encoderctls
+ * @see opus_multistream_ctls
+ */
+OPUS_EXPORT int opus_multistream_encoder_ctl(OpusMSEncoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+
+/**@}*/
+
+/**\name Multistream decoder functions */
+/**@{*/
+
+/** Gets the size of an OpusMSDecoder structure.
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @returns The size in bytes on success, or a negative error code
+ * (see @ref opus_errorcodes) on error.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_decoder_get_size(
+ int streams,
+ int coupled_streams
+);
+
+/** Allocates and initializes a multistream decoder state.
+ * Call opus_multistream_decoder_destroy() to release
+ * this object when finished.
+ * @param Fs opus_int32: Sampling rate to decode at (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels to output.
+ * This must be at most 255.
+ * It may be different from the number of coded
+ * channels (streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number of streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @param[in] mapping const unsigned char[channels]: Mapping from
+ * coded channels to output channels, as described in
+ * @ref opus_multistream.
+ * @param[out] error int *: Returns #OPUS_OK on success, or an error
+ * code (see @ref opus_errorcodes) on
+ * failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusMSDecoder *opus_multistream_decoder_create(
+ opus_int32 Fs,
+ int channels,
+ int streams,
+ int coupled_streams,
+ const unsigned char *mapping,
+ int *error
+) OPUS_ARG_NONNULL(5);
+
+/** Initialize a previously allocated decoder state object.
+ * The memory pointed to by \a st must be at least the size returned by
+ * opus_multistream_encoder_get_size().
+ * This is intended for applications which use their own allocator instead of
+ * malloc.
+ * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
+ * @see opus_multistream_decoder_create
+ * @see opus_multistream_deocder_get_size
+ * @param st OpusMSEncoder*: Multistream encoder state to initialize.
+ * @param Fs opus_int32: Sampling rate to decode at (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels to output.
+ * This must be at most 255.
+ * It may be different from the number of coded
+ * channels (streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number of streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @param[in] mapping const unsigned char[channels]: Mapping from
+ * coded channels to output channels, as described in
+ * @ref opus_multistream.
+ * @returns #OPUS_OK on success, or an error code (see @ref opus_errorcodes)
+ * on failure.
+ */
+OPUS_EXPORT int opus_multistream_decoder_init(
+ OpusMSDecoder *st,
+ opus_int32 Fs,
+ int channels,
+ int streams,
+ int coupled_streams,
+ const unsigned char *mapping
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(6);
+
+/** Decode a multistream Opus packet.
+ * @param st OpusMSDecoder*: Multistream decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int16*: Output signal, with interleaved
+ * samples.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_decode(
+ OpusMSDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int16 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode a multistream Opus packet.
+ * @param st OpusMSDecoder*: Multistream decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int32*: Output signal, with interleaved
+ * samples representing (or slightly exceeding) 24-bit values.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_decode24(
+ OpusMSDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int32 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode a multistream Opus packet with floating point output.
+ * @param st OpusMSDecoder*: Multistream decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int16*: Output signal, with interleaved
+ * samples.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_multistream_decode_float(
+ OpusMSDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ float *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Perform a CTL function on a multistream Opus decoder.
+ *
+ * Generally the request and subsequent arguments are generated by a
+ * convenience macro.
+ * @param st OpusMSDecoder*: Multistream decoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls,
+ * @ref opus_decoderctls, or @ref opus_multistream_ctls.
+ * @see opus_genericctls
+ * @see opus_decoderctls
+ * @see opus_multistream_ctls
+ */
+OPUS_EXPORT int opus_multistream_decoder_ctl(OpusMSDecoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+
+/** Frees an OpusMSDecoder allocated by
+ * opus_multistream_decoder_create().
+ * @param st OpusMSDecoder: Multistream decoder state to be freed.
+ */
+OPUS_EXPORT void opus_multistream_decoder_destroy(OpusMSDecoder *st);
+
+/**@}*/
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* OPUS_MULTISTREAM_H */
diff --git a/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_projection.h b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_projection.h
new file mode 100644
index 0000000..26f3cbb
--- /dev/null
+++ b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_projection.h
@@ -0,0 +1,643 @@
+/* Copyright (c) 2017 Google Inc.
+ Written by Andrew Allen */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ * @file opus_projection.h
+ * @brief Opus projection reference API
+ */
+
+#ifndef OPUS_PROJECTION_H
+#define OPUS_PROJECTION_H
+
+#include "opus_multistream.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @cond OPUS_INTERNAL_DOC */
+
+/** These are the actual encoder and decoder CTL ID numbers.
+ * They should not be used directly by applications.c
+ * In general, SETs should be even and GETs should be odd.*/
+/**@{*/
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX_GAIN_REQUEST 6001
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX_SIZE_REQUEST 6003
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX_REQUEST 6005
+/**@}*/
+
+
+/** @endcond */
+
+/** @defgroup opus_projection_ctls Projection specific encoder and decoder CTLs
+ *
+ * These are convenience macros that are specific to the
+ * opus_projection_encoder_ctl() and opus_projection_decoder_ctl()
+ * interface.
+ * The CTLs from @ref opus_genericctls, @ref opus_encoderctls,
+ * @ref opus_decoderctls, and @ref opus_multistream_ctls may be applied to a
+ * projection encoder or decoder as well.
+ */
+/**@{*/
+
+/** Gets the gain (in dB. S7.8-format) of the demixing matrix from the encoder.
+ * @param[out] x opus_int32 *: Returns the gain (in dB. S7.8-format)
+ * of the demixing matrix.
+ * @hideinitializer
+ */
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX_GAIN(x) OPUS_PROJECTION_GET_DEMIXING_MATRIX_GAIN_REQUEST, opus_check_int_ptr(x)
+
+
+/** Gets the size in bytes of the demixing matrix from the encoder.
+ * @param[out] x opus_int32 *: Returns the size in bytes of the
+ * demixing matrix.
+ * @hideinitializer
+ */
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX_SIZE(x) OPUS_PROJECTION_GET_DEMIXING_MATRIX_SIZE_REQUEST, opus_check_int_ptr(x)
+
+
+/** Copies the demixing matrix to the supplied pointer location.
+ * @param[out] x unsigned char *: Returns the demixing matrix to the
+ * supplied pointer location.
+ * @param y opus_int32: The size in bytes of the reserved memory at the
+ * pointer location.
+ * @hideinitializer
+ */
+#define OPUS_PROJECTION_GET_DEMIXING_MATRIX(x,y) OPUS_PROJECTION_GET_DEMIXING_MATRIX_REQUEST, x, opus_check_int(y)
+
+
+/**@}*/
+
+/** Opus projection encoder state.
+ * This contains the complete state of a projection Opus encoder.
+ * It is position independent and can be freely copied.
+ * @see opus_projection_ambisonics_encoder_create
+ */
+typedef struct OpusProjectionEncoder OpusProjectionEncoder;
+
+
+/** Opus projection decoder state.
+ * This contains the complete state of a projection Opus decoder.
+ * It is position independent and can be freely copied.
+ * @see opus_projection_decoder_create
+ * @see opus_projection_decoder_init
+ */
+typedef struct OpusProjectionDecoder OpusProjectionDecoder;
+
+
+/**\name Projection encoder functions */
+/**@{*/
+
+/** Gets the size of an OpusProjectionEncoder structure.
+ * @param channels int: The total number of input channels to encode.
+ * This must be no more than 255.
+ * @param mapping_family int: The mapping family to use for selecting
+ * the appropriate projection.
+ * @returns The size in bytes on success, or a negative error code
+ * (see @ref opus_errorcodes) on error.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_projection_ambisonics_encoder_get_size(
+ int channels,
+ int mapping_family
+);
+
+
+/** Allocates and initializes a projection encoder state.
+ * Call opus_projection_encoder_destroy() to release
+ * this object when finished.
+ * @param Fs opus_int32: Sampling rate of the input signal (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels in the input signal.
+ * This must be at most 255.
+ * It may be greater than the number of
+ * coded channels (streams +
+ * coupled_streams).
+ * @param mapping_family int: The mapping family to use for selecting
+ * the appropriate projection.
+ * @param[out] streams int *: The total number of streams that will
+ * be encoded from the input.
+ * @param[out] coupled_streams int *: Number of coupled (2 channel)
+ * streams that will be encoded from the input.
+ * @param application int: The target encoder application.
+ * This must be one of the following:
+ * streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams to encode from the
+ * input.
+ * This must be no more than the number of channels.
+ * @param coupled_streams int: Number of coupled (2 channel) streams
+ * to encode.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * encoded channels (streams +
+ * coupled_streams) must be no
+ * more than the number of input channels.
+ * @param application int: The target encoder application.
+ * This must be one of the following:
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_encode(
+ OpusProjectionEncoder *st,
+ const opus_int16 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+/** Encodes a projection Opus frame.
+ * @param st OpusProjectionEncoder*: Projection encoder state.
+ * @param[in] pcm const opus_int32*: The input signal as interleaved
+ * samples representing (or slightly exceeding) 24-bit values.
+ * This must contain
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_encode24(
+ OpusProjectionEncoder *st,
+ const opus_int32 *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+
+/** Encodes a projection Opus frame from floating point input.
+ * @param st OpusProjectionEncoder*: Projection encoder state.
+ * @param[in] pcm const float*: The input signal as interleaved
+ * samples with a normal range of
+ * +/-1.0.
+ * Samples with a range beyond +/-1.0
+ * are supported but will be clipped by
+ * decoders using the integer API and
+ * should only be used if it is known
+ * that the far end supports extended
+ * dynamic range.
+ * This must contain
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: Number of samples per channel in the input
+ * signal.
+ * This must be an Opus frame size for the
+ * encoder's sampling rate.
+ * For example, at 48 kHz the permitted values
+ * are 120, 240, 480, 960, 1920, and 2880.
+ * Passing in a duration of less than 10 ms
+ * (480 samples at 48 kHz) will prevent the
+ * encoder from using the LPC or hybrid modes.
+ * @param[out] data unsigned char*: Output payload.
+ * This must contain storage for at
+ * least \a max_data_bytes.
+ * @param [in] max_data_bytes opus_int32: Size of the allocated
+ * memory for the output
+ * payload. This may be
+ * used to impose an upper limit on
+ * the instant bitrate, but should
+ * not be used as the only bitrate
+ * control. Use #OPUS_SET_BITRATE to
+ * control the bitrate.
+ * @returns The length of the encoded packet (in bytes) on success or a
+ * negative error code (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_encode_float(
+ OpusProjectionEncoder *st,
+ const float *pcm,
+ int frame_size,
+ unsigned char *data,
+ opus_int32 max_data_bytes
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
+
+
+/** Frees an OpusProjectionEncoder allocated by
+ * opus_projection_ambisonics_encoder_create().
+ * @param st OpusProjectionEncoder*: Projection encoder state to be freed.
+ */
+OPUS_EXPORT void opus_projection_encoder_destroy(OpusProjectionEncoder *st);
+
+
+/** Perform a CTL function on a projection Opus encoder.
+ *
+ * Generally the request and subsequent arguments are generated by a
+ * convenience macro.
+ * @param st OpusProjectionEncoder*: Projection encoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls,
+ * @ref opus_encoderctls, @ref opus_multistream_ctls, or
+ * @ref opus_projection_ctls
+ * @see opus_genericctls
+ * @see opus_encoderctls
+ * @see opus_multistream_ctls
+ * @see opus_projection_ctls
+ */
+OPUS_EXPORT int opus_projection_encoder_ctl(OpusProjectionEncoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+
+
+/**@}*/
+
+/**\name Projection decoder functions */
+/**@{*/
+
+/** Gets the size of an OpusProjectionDecoder structure.
+ * @param channels int: The total number of output channels.
+ * This must be no more than 255.
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @returns The size in bytes on success, or a negative error code
+ * (see @ref opus_errorcodes) on error.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_projection_decoder_get_size(
+ int channels,
+ int streams,
+ int coupled_streams
+);
+
+
+/** Allocates and initializes a projection decoder state.
+ * Call opus_projection_decoder_destroy() to release
+ * this object when finished.
+ * @param Fs opus_int32: Sampling rate to decode at (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels to output.
+ * This must be at most 255.
+ * It may be different from the number of coded
+ * channels (streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number of streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @param[in] demixing_matrix const unsigned char[demixing_matrix_size]: Demixing matrix
+ * that mapping from coded channels to output channels,
+ * as described in @ref opus_projection and
+ * @ref opus_projection_ctls.
+ * @param demixing_matrix_size opus_int32: The size in bytes of the
+ * demixing matrix, as
+ * described in @ref
+ * opus_projection_ctls.
+ * @param[out] error int *: Returns #OPUS_OK on success, or an error
+ * code (see @ref opus_errorcodes) on
+ * failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusProjectionDecoder *opus_projection_decoder_create(
+ opus_int32 Fs,
+ int channels,
+ int streams,
+ int coupled_streams,
+ unsigned char *demixing_matrix,
+ opus_int32 demixing_matrix_size,
+ int *error
+) OPUS_ARG_NONNULL(5);
+
+
+/** Initialize a previously allocated projection decoder state object.
+ * The memory pointed to by \a st must be at least the size returned by
+ * opus_projection_decoder_get_size().
+ * This is intended for applications which use their own allocator instead of
+ * malloc.
+ * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
+ * @see opus_projection_decoder_create
+ * @see opus_projection_deocder_get_size
+ * @param st OpusProjectionDecoder*: Projection encoder state to initialize.
+ * @param Fs opus_int32: Sampling rate to decode at (in Hz).
+ * This must be one of 8000, 12000, 16000,
+ * 24000, or 48000.
+ * @param channels int: Number of channels to output.
+ * This must be at most 255.
+ * It may be different from the number of coded
+ * channels (streams +
+ * coupled_streams).
+ * @param streams int: The total number of streams coded in the
+ * input.
+ * This must be no more than 255.
+ * @param coupled_streams int: Number of streams to decode as coupled
+ * (2 channel) streams.
+ * This must be no larger than the total
+ * number of streams.
+ * Additionally, The total number of
+ * coded channels (streams +
+ * coupled_streams) must be no
+ * more than 255.
+ * @param[in] demixing_matrix const unsigned char[demixing_matrix_size]: Demixing matrix
+ * that mapping from coded channels to output channels,
+ * as described in @ref opus_projection and
+ * @ref opus_projection_ctls.
+ * @param demixing_matrix_size opus_int32: The size in bytes of the
+ * demixing matrix, as
+ * described in @ref
+ * opus_projection_ctls.
+ * @returns #OPUS_OK on success, or an error code (see @ref opus_errorcodes)
+ * on failure.
+ */
+OPUS_EXPORT int opus_projection_decoder_init(
+ OpusProjectionDecoder *st,
+ opus_int32 Fs,
+ int channels,
+ int streams,
+ int coupled_streams,
+ unsigned char *demixing_matrix,
+ opus_int32 demixing_matrix_size
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(6);
+
+
+/** Decode a projection Opus packet.
+ * @param st OpusProjectionDecoder*: Projection decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int16*: Output signal, with interleaved
+ * samples.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_decode(
+ OpusProjectionDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int16 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode a projection Opus packet.
+ * @param st OpusProjectionDecoder*: Projection decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int32*: Output signal, with interleaved
+ * samples representing (or slightly exceeding) 24-bit values.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_decode24(
+ OpusProjectionDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ opus_int32 *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+/** Decode a projection Opus packet with floating point output.
+ * @param st OpusProjectionDecoder*: Projection decoder state.
+ * @param[in] data const unsigned char*: Input payload.
+ * Use a NULL
+ * pointer to indicate packet
+ * loss.
+ * @param len opus_int32: Number of bytes in payload.
+ * @param[out] pcm opus_int16*: Output signal, with interleaved
+ * samples.
+ * This must contain room for
+ * frame_size*channels
+ * samples.
+ * @param frame_size int: The number of samples per channel of
+ * available space in \a pcm.
+ * If this is less than the maximum packet duration
+ * (120 ms; 5760 for 48kHz), this function will not be capable
+ * of decoding some packets. In the case of PLC (data==NULL)
+ * or FEC (decode_fec=1), then frame_size needs to be exactly
+ * the duration of audio that is missing, otherwise the
+ * decoder will not be in the optimal state to decode the
+ * next incoming packet. For the PLC and FEC cases, frame_size
+ * must be a multiple of 2.5 ms.
+ * @param decode_fec int: Flag (0 or 1) to request that any in-band
+ * forward error correction data be decoded.
+ * If no such data is available, the frame is
+ * decoded as if it were lost.
+ * @returns Number of samples decoded on success or a negative error code
+ * (see @ref opus_errorcodes) on failure.
+ */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_projection_decode_float(
+ OpusProjectionDecoder *st,
+ const unsigned char *data,
+ opus_int32 len,
+ float *pcm,
+ int frame_size,
+ int decode_fec
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
+
+
+/** Perform a CTL function on a projection Opus decoder.
+ *
+ * Generally the request and subsequent arguments are generated by a
+ * convenience macro.
+ * @param st OpusProjectionDecoder*: Projection decoder state.
+ * @param request This and all remaining parameters should be replaced by one
+ * of the convenience macros in @ref opus_genericctls,
+ * @ref opus_decoderctls, @ref opus_multistream_ctls, or
+ * @ref opus_projection_ctls.
+ * @see opus_genericctls
+ * @see opus_decoderctls
+ * @see opus_multistream_ctls
+ * @see opus_projection_ctls
+ */
+OPUS_EXPORT int opus_projection_decoder_ctl(OpusProjectionDecoder *st, int request, ...) OPUS_ARG_NONNULL(1);
+
+
+/** Frees an OpusProjectionDecoder allocated by
+ * opus_projection_decoder_create().
+ * @param st OpusProjectionDecoder: Projection decoder state to be freed.
+ */
+OPUS_EXPORT void opus_projection_decoder_destroy(OpusProjectionDecoder *st);
+
+
+/**@}*/
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* OPUS_PROJECTION_H */
diff --git a/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_types.h b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_types.h
new file mode 100644
index 0000000..7cf6755
--- /dev/null
+++ b/OpusSharp.Natives/runtimes/ios/native/libopus.xcframework/ios-arm64/Headers/opus_types.h
@@ -0,0 +1,166 @@
+/* (C) COPYRIGHT 1994-2002 Xiph.Org Foundation */
+/* Modified by Jean-Marc Valin */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/* opus_types.h based on ogg_types.h from libogg */
+
+/**
+ @file opus_types.h
+ @brief Opus reference implementation types
+*/
+#ifndef OPUS_TYPES_H
+#define OPUS_TYPES_H
+
+#define opus_int int /* used for counters etc; at least 16 bits */
+#define opus_int64 long long
+#define opus_int8 signed char
+
+#define opus_uint unsigned int /* used for counters etc; at least 16 bits */
+#define opus_uint64 unsigned long long
+#define opus_uint8 unsigned char
+
+/* Use the real stdint.h if it's there (taken from Paul Hsieh's pstdint.h) */
+#if (defined(__STDC__) && __STDC__ && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || (defined(__GNUC__) && (defined(_STDINT_H) || defined(_STDINT_H_)) || defined (HAVE_STDINT_H))
+#include IU0En6yA({clUCs(gDqGVJ>Ms
zg=LwnPK!zq|LK)ePCKYOSv_ZJh4$(a+UCl16fG;PbkM=0-E-)7&w?ISy1R{sk?(=h
z+Ka{RZr+F8`mNBzdiN+raMy|h-g}P=I<%KQ?hj8N#_g|)7bAKXS1iNH?K1h)nZh>T
zF`~O_en+Qw)m3`$$@cgn{j6Cp3*$|xQqb>WDn<8POkRA?#Z=0_W9U5<`dv(~((hPI
zPpx||rl-bt%&Vu$Jr