Update Opus to 1.1rc2

6 files changed, 1161 insertions, 488 deletions

diff --git a/thirdparty/include/opus.h b/thirdparty/include/opus.h
index a1f0156f..93a53a2f 100644
--- a/thirdparty/include/opus.h
+++ b/thirdparty/include/opus.h
@@ -67,6 +67,7 @@ extern "C" {
  * @li @ref opus_encoder
  * @li @ref opus_decoder
  * @li @ref opus_repacketizer
+ * @li @ref opus_multistream
  * @li @ref opus_libinfo
  * @li @ref opus_custom
  */
@@ -135,10 +136,11 @@ extern "C" {
   * <li>audio_frame is the audio data in opus_int16 (or float for opus_encode_float())</li>
   * <li>frame_size is the duration of the frame in samples (per channel)</li>
   * <li>packet is the byte array to which the compressed data is written</li>
-  * <li>max_packet is the maximum number of bytes that can be written in the packet (4000 bytes is recommended)</li>
+  * <li>max_packet is the maximum number of bytes that can be written in the packet (4000 bytes is recommended).
+  *     Do not use max_packet to control VBR target bitrate, instead use the #OPUS_SET_BITRATE CTL.</li>
   * </ul>
   *
-  * opus_encode() and opus_encode_frame() return the number of bytes actually written to the packet.
+  * opus_encode() and opus_encode_float() return the number of bytes actually written to the packet.
   * The return value <b>can be negative</b>, which indicates that an error has occurred. If the return value
   * is 1 byte, then the packet does not need to be transmitted (DTX).
   *
@@ -161,6 +163,11 @@ extern "C" {
   */
 typedef struct OpusEncoder OpusEncoder;
 
+/** Gets the size of an <code>OpusEncoder</code> structure.
+  * @param[in] channels <tt>int</tt>: Number of channels.
+  *                                   This must be 1 or 2.
+  * @returns The size in bytes.
+  */
 OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_encoder_get_size(int channels);
 
 /**
@@ -188,11 +195,13 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_encoder_get_size(int channels);
  *
  * This is useful when the caller knows that the speech-optimized modes will not be needed (use with caution).
  * @param [in] Fs <tt>opus_int32</tt>: Sampling rate of input signal (Hz)
- * @param [in] channels <tt>int</tt>: Number of channels (1/2) in input signal
+ *                                     This must be one of 8000, 12000, 16000,
+ *                                     24000, or 48000.
+ * @param [in] channels <tt>int</tt>: Number of channels (1 or 2) in input signal
  * @param [in] application <tt>int</tt>: Coding mode (@ref OPUS_APPLICATION_VOIP/@ref OPUS_APPLICATION_AUDIO/@ref OPUS_APPLICATION_RESTRICTED_LOWDELAY)
  * @param [out] error <tt>int*</tt>: @ref opus_errorcodes
  * @note Regardless of the sampling rate and number channels selected, the Opus encoder
- * can switch to a lower audio audio bandwidth or number of channels if the bitrate
+ * 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.
  */
@@ -204,15 +213,17 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusEncoder *opus_encoder_create(
 );
 
 /** Initializes a previously allocated encoder state
-  * The memory pointed to by st must be the size returned by opus_encoder_get_size.
+  * 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.
+  * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
   * @param [in] st <tt>OpusEncoder*</tt>: Encoder state
   * @param [in] Fs <tt>opus_int32</tt>: Sampling rate of input signal (Hz)
-  * @param [in] channels <tt>int</tt>: Number of channels (1/2) in input signal
+ *                                      This must be one of 8000, 12000, 16000,
+ *                                      24000, or 48000.
+  * @param [in] channels <tt>int</tt>: Number of channels (1 or 2) in input signal
   * @param [in] application <tt>int</tt>: Coding mode (OPUS_APPLICATION_VOIP/OPUS_APPLICATION_AUDIO/OPUS_APPLICATION_RESTRICTED_LOWDELAY)
-  * @retval OPUS_OK Success or @ref opus_errorcodes
+  * @retval #OPUS_OK Success or @ref opus_errorcodes
   */
 OPUS_EXPORT int opus_encoder_init(
     OpusEncoder *st,
@@ -222,16 +233,32 @@ OPUS_EXPORT int opus_encoder_init(
 ) OPUS_ARG_NONNULL(1);
 
 /** Encodes an Opus frame.
-  * The passed frame_size must an opus frame size for the encoder's sampling rate.
-  * For example, at 48kHz the permitted values are 120, 240, 480, 960, 1920, and 2880.
-  * Passing in a duration of less than 10ms (480 samples at 48kHz) will
-  * prevent the encoder from using the LPC or hybrid modes.
   * @param [in] st <tt>OpusEncoder*</tt>: Encoder state
   * @param [in] pcm <tt>opus_int16*</tt>: Input signal (interleaved if 2 channels). length is frame_size*channels*sizeof(opus_int16)
-  * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
-  * @param [out] data <tt>char*</tt>: Output payload (at least max_data_bytes long)
-  * @param [in] max_data_bytes <tt>opus_int32</tt>: Allocated memory for payload; don't use for controlling bitrate
-  * @returns length of the data payload (in bytes) or @ref opus_errorcodes
+  * @param [in] frame_size <tt>int</tt>: 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 <tt>unsigned char*</tt>: Output payload.
+  *                                            This must contain storage for at
+  *                                            least \a max_data_bytes.
+  * @param [in] max_data_bytes <tt>opus_int32</tt>: 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,
@@ -242,10 +269,6 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode(
 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2) OPUS_ARG_NONNULL(4);
 
 /** Encodes an Opus frame from floating point input.
-  * The passed frame_size must an opus frame size for the encoder's sampling rate.
-  * For example, at 48kHz the permitted values are 120, 240, 480, 960, 1920, and 2880.
-  * Passing in a duration of less than 10ms (480 samples at 48kHz) will
-  * prevent the encoder from using the LPC or hybrid modes.
   * @param [in] st <tt>OpusEncoder*</tt>: Encoder state
   * @param [in] pcm <tt>float*</tt>: 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
@@ -253,10 +276,30 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode(
   *          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 <tt>int</tt>: Number of samples per frame of input signal
-  * @param [out] data <tt>char*</tt>: Output payload (at least max_data_bytes long)
-  * @param [in] max_data_bytes <tt>opus_int32</tt>: Allocated memory for payload; don't use for controlling bitrate
-  * @returns length of the data payload (in bytes) or @ref opus_errorcodes
+  * @param [in] frame_size <tt>int</tt>: 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 <tt>unsigned char*</tt>: Output payload.
+  *                                            This must contain storage for at
+  *                                            least \a max_data_bytes.
+  * @param [in] max_data_bytes <tt>opus_int32</tt>: 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,
@@ -266,7 +309,7 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_encode_float(
     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.
+/** Frees an <code>OpusEncoder</code> allocated by opus_encoder_create().
   * @param[in] st <tt>OpusEncoder*</tt>: State to be freed.
   */
 OPUS_EXPORT void opus_encoder_destroy(OpusEncoder *st);
@@ -275,6 +318,11 @@ OPUS_EXPORT void opus_encoder_destroy(OpusEncoder *st);
   *
   * Generally the request and subsequent arguments are generated
   * by a convenience macro.
+  * @param st <tt>OpusEncoder*</tt>: 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);
@@ -295,7 +343,7 @@ OPUS_EXPORT int opus_encoder_ctl(OpusEncoder *st, int request, ...) OPUS_ARG_NON
   * 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 or failure (or OPUS_OK on success)
+  * @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
@@ -326,7 +374,7 @@ OPUS_EXPORT int opus_encoder_ctl(OpusEncoder *st, int request, ...) OPUS_ARG_NON
   * @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 occured. This can occur if the packet is corrupted or if the audio
+  * 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
@@ -350,16 +398,19 @@ OPUS_EXPORT int opus_encoder_ctl(OpusEncoder *st, int request, ...) OPUS_ARG_NON
   */
 typedef struct OpusDecoder OpusDecoder;
 
-/** Gets the size of an OpusDecoder structure.
-  * @param [in] channels <tt>int</tt>: Number of channels
-  * @returns size
+/** Gets the size of an <code>OpusDecoder</code> structure.
+  * @param [in] channels <tt>int</tt>: 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 <tt>opus_int32</tt>: Sample rate to decode at (Hz)
-  * @param [in] channels <tt>int</tt>: Number of channels (1/2) to decode
-  * @param [out] error <tt>int*</tt>: OPUS_OK Success or @ref opus_errorcodes
+  * @param [in] Fs <tt>opus_int32</tt>: Sample rate to decode at (Hz).
+  *                                     This must be one of 8000, 12000, 16000,
+  *                                     24000, or 48000.
+  * @param [in] channels <tt>int</tt>: Number of channels (1 or 2) to decode
+  * @param [out] error <tt>int*</tt>: #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
@@ -376,13 +427,15 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusDecoder *opus_decoder_create(
 );
 
 /** Initializes a previously allocated decoder state.
-  * The state must be the size returned by opus_decoder_get_size.
+  * 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.
+  * To reset a previously initialized state, use the #OPUS_RESET_STATE CTL.
   * @param [in] st <tt>OpusDecoder*</tt>: Decoder state.
-  * @param [in] Fs <tt>opus_int32</tt>: Sampling rate to decode to (Hz)
-  * @param [in] channels <tt>int</tt>: Number of channels (1/2) to decode
-  * @retval OPUS_OK Success or @ref opus_errorcodes
+  * @param [in] Fs <tt>opus_int32</tt>: Sampling rate to decode to (Hz).
+  *                                     This must be one of 8000, 12000, 16000,
+  *                                     24000, or 48000.
+  * @param [in] channels <tt>int</tt>: Number of channels (1 or 2) to decode
+  * @retval #OPUS_OK Success or @ref opus_errorcodes
   */
 OPUS_EXPORT int opus_decoder_init(
     OpusDecoder *st,
@@ -390,16 +443,20 @@ OPUS_EXPORT int opus_decoder_init(
     int channels
 ) OPUS_ARG_NONNULL(1);
 
-/** Decode an Opus frame
+/** Decode an Opus packet.
   * @param [in] st <tt>OpusDecoder*</tt>: Decoder state
   * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
   * @param [in] len <tt>opus_int32</tt>: Number of bytes in payload*
   * @param [out] pcm <tt>opus_int16*</tt>: 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,
-  *  if less than the maximum frame size (120ms) some frames can not be decoded
-  * @param [in] decode_fec <tt>int</tt>: Flag (0/1) 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.
+  * @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 <b>must</b> be a multiple of 2.5 ms.
+  * @param [in] decode_fec <tt>int</tt>: 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_decode(
@@ -411,15 +468,19 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decode(
     int decode_fec
 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
 
-/** Decode an opus frame with floating point output
+/** Decode an Opus packet with floating point output.
   * @param [in] st <tt>OpusDecoder*</tt>: Decoder state
   * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
   * @param [in] len <tt>opus_int32</tt>: Number of bytes in payload
   * @param [out] pcm <tt>float*</tt>: 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,
-  *  if less than the maximum frame size (120ms) some frames can not be decoded
-  * @param [in] decode_fec <tt>int</tt>: Flag (0/1) to request that any in-band forward error correction data be
+  * @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 <b>must</b> be a multiple of 2.5 ms.
+  * @param [in] decode_fec <tt>int</tt>: 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
   */
@@ -436,11 +497,16 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_decode_float(
   *
   * Generally the request and subsequent arguments are generated
   * by a convenience macro.
+  * @param st <tt>OpusDecoder*</tt>: 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.
+/** Frees an <code>OpusDecoder</code> allocated by opus_decoder_create().
   * @param[in] st <tt>OpusDecoder*</tt>: State to be freed.
   */
 OPUS_EXPORT void opus_decoder_destroy(OpusDecoder *st);
@@ -454,7 +520,7 @@ OPUS_EXPORT void opus_decoder_destroy(OpusDecoder *st);
   * @param [in] len <tt>opus_int32</tt>: size of data
   * @param [out] out_toc <tt>char*</tt>: TOC pointer
   * @param [out] frames <tt>char*[48]</tt> encapsulated frames
-  * @param [out] size <tt>short[48]</tt> sizes of the encapsulated frames
+  * @param [out] size <tt>opus_int16[48]</tt> sizes of the encapsulated frames
   * @param [out] payload_offset <tt>int*</tt>: returns the position of the payload within the packet (in bytes)
   * @returns number of frames
   */
@@ -463,7 +529,7 @@ OPUS_EXPORT int opus_packet_parse(
    opus_int32 len,
    unsigned char *out_toc,
    const unsigned char *frames[48],
-   short size[48],
+   opus_int16 size[48],
    int *payload_offset
 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(4);
 
@@ -479,10 +545,13 @@ OPUS_EXPORT int opus_packet_parse(
 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 <tt>char*</tt>: Opus packet
-  * @param [in] Fs <tt>opus_int32</tt>: Sampling rate in Hz
-  * @returns Number of samples per frame
-  * @retval OPUS_INVALID_PACKET The compressed data passed is corrupted or of an unsupported type
+  * @param [in] data <tt>char*</tt>: Opus packet.
+  *                                  This must contain at least one byte of
+  *                                  data.
+  * @param [in] Fs <tt>opus_int32</tt>: 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);
 
@@ -497,46 +566,409 @@ OPUS_EXPORT OPUS_WARN_UNUSED_RESULT int opus_packet_get_nb_channels(const unsign
   * @param [in] packet <tt>char*</tt>: Opus packet
   * @param [in] len <tt>opus_int32</tt>: 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 <tt>char*</tt>: Opus packet
+  * @param [in] len <tt>opus_int32</tt>: Length of packet
+  * @param [in] Fs <tt>opus_int32</tt>: 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);
+
+/** Gets the number of samples of an Opus packet.
   * @param [in] dec <tt>OpusDecoder*</tt>: Decoder state
   * @param [in] packet <tt>char*</tt>: Opus packet
   * @param [in] len <tt>opus_int32</tt>: 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 <tt>float*</tt>: Input PCM and modified PCM
+  * @param [in] frame_size <tt>int</tt> Number of samples per channel to process
+  * @param [in] channels <tt>int</tt>: Number of channels
+  * @param [in,out] softclip_mem <tt>float*</tt>: 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.
+  * 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 repacketizer currently only operates on elementary Opus
+  * streams. It will not manipualte 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 <code>TARGET_DURATION_MS</code> 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 <code>OpusRepacketizer</code> 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 <tt>OpusRepacketizer*</tt>: 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 <code>OpusRepacketizer</code> allocated by
+  * opus_repacketizer_create().
+  * @param[in] rp <tt>OpusRepacketizer*</tt>: 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 <tt>OpusRepacketizer*</tt>: The repacketizer state to which to
+  *                                       add the packet.
+  * @param[in] data <tt>const unsigned char*</tt>: 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 <tt>opus_int32</tt>: 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 <tt>OpusRepacketizer*</tt>: The repacketizer state from which to
+  *                                       construct the new packet.
+  * @param begin <tt>int</tt>: The index of the first frame in the current
+  *                            repacketizer state to include in the output.
+  * @param end <tt>int</tt>: One past the index of the last frame in the
+  *                          current repacketizer state to include in the
+  *                          output.
+  * @param[out] data <tt>const unsigned char*</tt>: The buffer in which to
+  *                                                 store the output packet.
+  * @param maxlen <tt>opus_int32</tt>: The maximum number of bytes to store in
+  *                                    the output buffer. In order to guarantee
+  *                                    success, this should be at least
+  *                                    <code>1276</code> for a single frame,
+  *                                    or for multiple frames,
+  *                                    <code>1277*(end-begin)</code>.
+  *                                    However, <code>1*(end-begin)</code> 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 <code>[begin,end)</code> 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 <tt>OpusRepacketizer*</tt>: 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 <tt>OpusRepacketizer*</tt>: The repacketizer state from which to
+  *                                       construct the new packet.
+  * @param[out] data <tt>const unsigned char*</tt>: The buffer in which to
+  *                                                 store the output packet.
+  * @param maxlen <tt>opus_int32</tt>: The maximum number of bytes to store in
+  *                                    the output buffer. In order to guarantee
+  *                                    success, this should be at least
+  *                                    <code>1277*opus_repacketizer_get_nb_frames(rp)</code>.
+  *                                    However,
+  *                                    <code>1*opus_repacketizer_get_nb_frames(rp)</code>
+  *                                    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 <tt>const unsigned char*</tt>: The buffer containing the
+  *                                                   packet to pad.
+  * @param len <tt>opus_int32</tt>: The size of the packet.
+  *                                 This must be at least 1.
+  * @param new_len <tt>opus_int32</tt>: 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 <tt>const unsigned char*</tt>: The buffer containing the
+  *                                                   packet to strip.
+  * @param len <tt>opus_int32</tt>: 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 <tt>const unsigned char*</tt>: The buffer containing the
+  *                                                   packet to pad.
+  * @param len <tt>opus_int32</tt>: The size of the packet.
+  *                                 This must be at least 1.
+  * @param new_len <tt>opus_int32</tt>: The desired size of the packet after padding.
+  *                                 This must be at least 1.
+  * @param nb_streams <tt>opus_int32</tt>: 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 <tt>const unsigned char*</tt>: The buffer containing the
+  *                                                   packet to strip.
+  * @param len <tt>opus_int32</tt>: The size of the packet.
+  *                                 This must be at least 1.
+  * @param nb_streams <tt>opus_int32</tt>: 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
diff --git a/thirdparty/include/opus_custom.h b/thirdparty/include/opus_custom.h
deleted file mode 100644
index e7861d6f..00000000
--- a/thirdparty/include/opus_custom.h
+++ /dev/null
@@ -1,329 +0,0 @@
-/* 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
-
-#ifdef CUSTOM_MODES
-#define OPUS_CUSTOM_EXPORT OPUS_EXPORT
-#define OPUS_CUSTOM_EXPORT_STATIC OPUS_EXPORT
-#else
-#define OPUS_CUSTOM_EXPORT
-#ifdef CELT_C
-#define OPUS_CUSTOM_EXPORT_STATIC static 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.
-   @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 <tt>int</tt>: Sampling rate (8000 to 96000 Hz)
-  * @param [in] frame_size <tt>int</tt>: 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 <tt>int*</tt>: 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 <tt>OpusCustomMode*</tt>: Mode to be freed.
-  */
-OPUS_CUSTOM_EXPORT void opus_custom_mode_destroy(OpusCustomMode *mode);
-
-/* Encoder */
-/** Gets the size of an OpusCustomEncoder structure.
-  * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
-  * @param [in] channels <tt>int</tt>: 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);
-
-/** Creates a new encoder state. Each stream needs its own encoder
-  * state (can't be shared across simultaneous streams).
-  * @param [in] mode <tt>OpusCustomMode*</tt>: Contains all the information about the characteristics of
-  *  the stream (must be the same characteristics as used for the
-  *  decoder)
-  * @param [in] channels <tt>int</tt>: Number of channels
-  * @param [out] error <tt>int*</tt>: 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);
-
-/** 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 <tt>OpusCustomEncoder*</tt>: Encoder state
-  * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
-  *  the stream (must be the same characteristics as used for the
-  *  decoder)
-  * @param [in] channels <tt>int</tt>: Number of channels
-  * @return OPUS_OK Success or @ref opus_errorcodes
-  */
-OPUS_CUSTOM_EXPORT_STATIC int opus_custom_encoder_init(
-    OpusCustomEncoder *st,
-    const OpusCustomMode *mode,
-    int channels
-) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(2);
-
-/** Destroys a an encoder state.
-  * @param[in] st <tt>OpusCustomEncoder*</tt>: State to be freed.
-  */
-OPUS_CUSTOM_EXPORT void opus_custom_encoder_destroy(OpusCustomEncoder *st);
-
-/** Encodes a frame of audio.
-  * @param [in] st <tt>OpusCustomEncoder*</tt>: Encoder state
-  * @param [in] pcm <tt>float*</tt>: 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 <tt>int</tt>: Number of samples per frame of input signal
-  * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
-  * @param [in] maxCompressedBytes <tt>int</tt>: 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 <tt>OpusCustomEncoder*</tt>: Encoder state
-  * @param [in] pcm <tt>opus_int16*</tt>: PCM audio in signed 16-bit format (native endian).
-  *          There must be exactly frame_size samples per channel.
-  * @param [in] frame_size <tt>int</tt>: Number of samples per frame of input signal
-  * @param [out] compressed <tt>char *</tt>: The compressed data is written here. This may not alias pcm and must be at least maxCompressedBytes long.
-  * @param [in] maxCompressedBytes <tt>int</tt>: 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);
-
-/** 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);
-
-/* Decoder */
-
-/** Gets the size of an OpusCustomDecoder structure.
-  * @param [in] mode <tt>OpusCustomMode *</tt>: Mode configuration
-  * @param [in] channels <tt>int</tt>: 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);
-
-/** Creates a new decoder state. Each stream needs its own decoder state (can't
-  * be shared across simultaneous streams).
-  * @param [in] mode <tt>OpusCustomMode</tt>: Contains all the information about the characteristics of the
-  *          stream (must be the same characteristics as used for the encoder)
-  * @param [in] channels <tt>int</tt>: Number of channels
-  * @param [out] error <tt>int*</tt>: 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);
-
-/** 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 <tt>OpusCustomDecoder*</tt>: Decoder state
-  * @param [in] mode <tt>OpusCustomMode *</tt>: Contains all the information about the characteristics of
-  *  the stream (must be the same characteristics as used for the
-  *  encoder)
-  * @param [in] channels <tt>int</tt>: 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);
-
-/** Destroys a an decoder state.
-  * @param[in] st <tt>OpusCustomDecoder*</tt>: 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 <tt>OpusCustomDecoder*</tt>: Decoder state
-  * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
-  * @param [in] len <tt>int</tt>: Number of bytes in payload
-  * @param [out] pcm <tt>float*</tt>: 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 <tt>OpusCustomDecoder*</tt>: Decoder state
-  * @param [in] data <tt>char*</tt>: Input payload. Use a NULL pointer to indicate packet loss
-  * @param [in] len <tt>int</tt>: Number of bytes in payload
-  * @param [out] pcm <tt>opus_int16*</tt>: 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);
-
-/** 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/thirdparty/include/opus_defines.h b/thirdparty/include/opus_defines.h
index 830d225f..265089f6 100644
--- a/thirdparty/include/opus_defines.h
+++ b/thirdparty/include/opus_defines.h
@@ -63,16 +63,18 @@ extern "C" {
 /** @cond OPUS_INTERNAL_DOC */
 /**Export control for opus functions */
 
-#if defined(__GNUC__) && defined(OPUS_BUILD)
-# define OPUS_EXPORT __attribute__ ((visibility ("default")))
-#elif defined(WIN32) && !defined(__MINGW32__)
-# ifdef OPUS_BUILD
+#ifndef OPUS_EXPORT
+# if defined(WIN32)
+#  ifdef OPUS_BUILD
 #   define OPUS_EXPORT __declspec(dllexport)
-# else
+#  else
 #   define OPUS_EXPORT
+#  endif
+# elif defined(__GNUC__) && defined(OPUS_BUILD)
+#  define OPUS_EXPORT __attribute__ ((visibility ("default")))
+# else
+#  define OPUS_EXPORT
 # endif
-#else
-# define OPUS_EXPORT
 #endif
 
 # if !defined(OPUS_GNUC_PREREQ)
@@ -96,6 +98,18 @@ extern "C" {
 # 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. */
@@ -143,14 +157,22 @@ extern "C" {
 #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
+#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 */
 
 /* 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))
 #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_val16_ptr(ptr) ((ptr) + ((ptr) - (opus_val16*)(ptr)))
 /** @endcond */
 
 /** @defgroup opus_ctlvalues Pre-defined values for CTL interface
@@ -179,6 +201,14 @@ extern "C" {
 #define OPUS_BANDWIDTH_SUPERWIDEBAND         1104 /**<12 kHz bandpass @hideinitializer*/
 #define OPUS_BANDWIDTH_FULLBAND              1105 /**<20 kHz bandpass @hideinitializer*/
 
+#define OPUS_FRAMESIZE_ARG                   5000 /**< Select frame size from the argument (default) */
+#define OPUS_FRAMESIZE_2_5_MS                5001 /**< Use 2.5 ms frames */
+#define OPUS_FRAMESIZE_5_MS                  5002 /**< Use 5 ms frames */
+#define OPUS_FRAMESIZE_10_MS                 5003 /**< Use 10 ms frames */
+#define OPUS_FRAMESIZE_20_MS                 5004 /**< Use 20 ms frames */
+#define OPUS_FRAMESIZE_40_MS                 5005 /**< Use 40 ms frames */
+#define OPUS_FRAMESIZE_60_MS                 5006 /**< Use 60 ms frames */
+
 /**@}*/
 
 
@@ -501,6 +531,71 @@ extern "C" {
   * </dl>
   * @hideinitializer */
 #define OPUS_GET_DTX(x) OPUS_GET_DTX_REQUEST, __opus_check_int_ptr(x)
+/** Configures the depth of signal being encoded.
+  * This is a hint which helps the encoder identify silence and near-silence.
+  * @see OPUS_GET_LSB_DEPTH
+  * @param[in] x <tt>opus_int32</tt>: Input precision in bits, between 8 and 24
+  *                                   (default: 24).
+  * @hideinitializer */
+#define OPUS_SET_LSB_DEPTH(x) OPUS_SET_LSB_DEPTH_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured signal depth.
+  * @see OPUS_SET_LSB_DEPTH
+  * @param[out] x <tt>opus_int32 *</tt>: Input precision in bits, between 8 and
+  *                                      24 (default: 24).
+  * @hideinitializer */
+#define OPUS_GET_LSB_DEPTH(x) OPUS_GET_LSB_DEPTH_REQUEST, __opus_check_int_ptr(x)
+
+/** Gets the duration (in samples) of the last packet successfully decoded or concealed.
+  * @param[out] x <tt>opus_int32 *</tt>: Number of samples (at current sampling rate).
+  * @hideinitializer */
+#define OPUS_GET_LAST_PACKET_DURATION(x) OPUS_GET_LAST_PACKET_DURATION_REQUEST, __opus_check_int_ptr(x)
+
+/** Configures the encoder's use of variable duration frames.
+  * When variable duration is enabled, the encoder is free to use a shorter frame
+  * size than the one requested in the opus_encode*() call.
+  * It is then the user's responsibility
+  * to verify how much audio was encoded by checking the ToC byte of the encoded
+  * packet. The part of the audio that was not encoded needs to be resent to the
+  * encoder for the next call. Do not use this option unless you <b>really</b>
+  * know what you are doing.
+  * @see OPUS_GET_EXPERT_VARIABLE_DURATION
+  * @param[in] x <tt>opus_int32</tt>: Allowed values:
+  * <dl>
+  * <dt>OPUS_FRAMESIZE_ARG</dt><dd>Select frame size from the argument (default).</dd>
+  * <dt>OPUS_FRAMESIZE_2_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_10_MS</dt><dd>Use 10 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_20_MS</dt><dd>Use 20 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_40_MS</dt><dd>Use 40 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_60_MS</dt><dd>Use 60 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_VARIABLE</dt><dd>Optimize the frame size dynamically.</dd>
+  * </dl>
+  * @hideinitializer */
+#define OPUS_SET_EXPERT_FRAME_DURATION(x) OPUS_SET_EXPERT_FRAME_DURATION_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured use of variable duration frames.
+  * @see OPUS_SET_EXPERT_VARIABLE_DURATION
+  * @param[out] x <tt>opus_int32 *</tt>: Returns one of the following values:
+  * <dl>
+  * <dt>OPUS_FRAMESIZE_ARG</dt><dd>Select frame size from the argument (default).</dd>
+  * <dt>OPUS_FRAMESIZE_2_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_5_MS</dt><dd>Use 2.5 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_10_MS</dt><dd>Use 10 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_20_MS</dt><dd>Use 20 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_40_MS</dt><dd>Use 40 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_60_MS</dt><dd>Use 60 ms frames.</dd>
+  * <dt>OPUS_FRAMESIZE_VARIABLE</dt><dd>Optimize the frame size dynamically.</dd>
+  * </dl>
+  * @hideinitializer */
+#define OPUS_GET_EXPERT_FRAME_DURATION(x) OPUS_GET_EXPERT_FRAME_DURATION_REQUEST, __opus_check_int_ptr(x)
+
+/** If set to 1, disables almost all use of prediction, making frames almost
+    completely independent. This reduces quality. (default : 0)
+  * @hideinitializer */
+#define OPUS_SET_PREDICTION_DISABLED(x) OPUS_SET_PREDICTION_DISABLED_REQUEST, __opus_check_int(x)
+/** Gets the encoder's configured prediction status.
+  * @hideinitializer */
+#define OPUS_GET_PREDICTION_DISABLED(x) OPUS_GET_PREDICTION_DISABLED_REQUEST, __opus_check_int_ptr(x)
+
 /**@}*/
 
 /** @defgroup opus_genericctls Generic CTLs
@@ -580,19 +675,6 @@ extern "C" {
   * @hideinitializer */
 #define OPUS_GET_BANDWIDTH(x) OPUS_GET_BANDWIDTH_REQUEST, __opus_check_int_ptr(x)
 
-/** Configures the depth of signal being encoded.
-  * This is a hint which helps the encoder identify silence and near-silence.
-  * @see OPUS_GET_LSB_DEPTH
-  * @param[in] x <tt>opus_int32</tt>: Input precision in bits, between 8 and 24
-  *                                   (default: 24).
-  * @hideinitializer */
-#define OPUS_SET_LSB_DEPTH(x) OPUS_SET_LSB_DEPTH_REQUEST, __opus_check_int(x)
-/** Gets the encoder's configured signal depth.
-  * @see OPUS_SET_LSB_DEPTH
-  * @param[out] x <tt>opus_int32 *</tt>: Input precision in bits, between 8 and
-  *                                      24 (default: 24).
-  * @hideinitializer */
-#define OPUS_GET_LSB_DEPTH(x) OPUS_GET_LSB_DEPTH_REQUEST, __opus_check_int_ptr(x)
 /**@}*/
 
 /** @defgroup opus_decoderctls Decoder related CTLs
diff --git a/thirdparty/include/opus_multistream.h b/thirdparty/include/opus_multistream.h
index 5e5364a3..ae599793 100644
--- a/thirdparty/include/opus_multistream.h
+++ b/thirdparty/include/opus_multistream.h
@@ -39,132 +39,620 @@
 extern "C" {
 #endif
 
-typedef struct OpusMSEncoder OpusMSEncoder;
-typedef struct OpusMSDecoder OpusMSDecoder;
+/** @cond OPUS_INTERNAL_DOC */
 
+/** Macros to trigger compilation errors when the wrong types are provided to a
+  * CTL. */
+/**@{*/
 #define __opus_check_encstate_ptr(ptr) ((ptr) + ((ptr) - (OpusEncoder**)(ptr)))
 #define __opus_check_decstate_ptr(ptr) ((ptr) + ((ptr) - (OpusDecoder**)(ptr)))
+/**@}*/
 
+/** These are the actual encoder and decoder CTL ID numbers.
+  * They should not be used directly by applications.
+  * In general, SETs should be even and GETs should be odd.*/
+/**@{*/
 #define OPUS_MULTISTREAM_GET_ENCODER_STATE_REQUEST 5120
 #define OPUS_MULTISTREAM_GET_DECODER_STATE_REQUEST 5122
+/**@}*/
 
+/** @endcond */
+
+/** @defgroup opus_multistream_ctls Multistream specific encoder and decoder CTLs
+  *
+  * These are convenience macros that are specific to the
+  * opus_multistream_encoder_ctl() and opus_multistream_decoder_ctl()
+  * interface.
+  * The CTLs from @ref opus_genericctls, @ref opus_encoderctls, and
+  * @ref opus_decoderctls may be applied to a multistream encoder or decoder as
+  * well.
+  * In addition, you may retrieve the encoder or decoder state for an specific
+  * stream via #OPUS_MULTISTREAM_GET_ENCODER_STATE or
+  * #OPUS_MULTISTREAM_GET_DECODER_STATE and apply CTLs to it individually.
+  */
+/**@{*/
+
+/** Gets the encoder state for an individual stream of a multistream encoder.
+  * @param[in] x <tt>opus_int32</tt>: The index of the stream whose encoder you
+  *                                   wish to retrieve.
+  *                                   This must be non-negative and less than
+  *                                   the <code>streams</code> parameter used
+  *                                   to initialize the encoder.
+  * @param[out] y <tt>OpusEncoder**</tt>: 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 <tt>opus_int32</tt>: The index of the stream whose decoder you
+  *                                   wish to retrieve.
+  *                                   This must be non-negative and less than
+  *                                   the <code>streams</code> parameter used
+  *                                   to initialize the decoder.
+  * @param[out] y <tt>OpusDecoder**</tt>: 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)
 
-/** Allocate and initialize a multistream encoder state object.
- *  Call opus_multistream_encoder_destroy() to release
- *  this object when finished. */
+/**@}*/
+
+/** @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 the
+  * <a href="http://tools.ietf.org/html/draft-terriberry-oggopus">Ogg
+  * encapsulation specification</a> and is based on the self-delimited Opus
+  * framing described in Appendix B of <a href="http://tools.ietf.org/html/rfc6716">RFC 6716</a>.
+  * Normal Opus packets are just a degenerate case of multistream Opus packets,
+  * and can be encoded or decoded with the multistream API by setting
+  * <code>streams</code> to <code>1</code> 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 <code>mapping</code> table defines which decoded channel <code>i</code>
+  * should be used for each input/output (I/O) channel <code>j</code>. This table is
+  * typically provided as an unsigned char array.
+  * Let <code>i = mapping[j]</code> be the index for I/O channel <code>j</code>.
+  * If <code>i < 2*coupled_streams</code>, then I/O channel <code>j</code> is
+  * encoded as the left channel of stream <code>(i/2)</code> if <code>i</code>
+  * is even, or  as the right channel of stream <code>(i/2)</code> if
+  * <code>i</code> is odd. Otherwise, I/O channel <code>j</code> is encoded as
+  * mono in stream <code>(i - coupled_streams)</code>, 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 <code>i</code> must either
+  * be the special value 255 or be less than <code>streams + coupled_streams</code>.
+  *
+  * The output channels specified by the encoder
+  * should use the
+  * <a href="http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9">Vorbis
+  * channel ordering</a>. 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 outputing 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 <tt>int</tt>: The total number of streams to encode from the
+  *                              input.
+  *                              This must be no more than 255.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) 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 <tt>opus_int32</tt>: Sampling rate of the input signal (in Hz).
+  *                                This must be one of 8000, 12000, 16000,
+  *                                24000, or 48000.
+  * @param channels <tt>int</tt>: Number of channels in the input signal.
+  *                               This must be at most 255.
+  *                               It may be greater than the number of
+  *                               coded channels (<code>streams +
+  *                               coupled_streams</code>).
+  * @param streams <tt>int</tt>: The total number of streams to encode from the
+  *                              input.
+  *                              This must be no more than the number of channels.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) must be no
+  *                                      more than the number of input channels.
+  * @param[in] mapping <code>const unsigned char[channels]</code>: 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 <tt>int</tt>: The target encoder application.
+  *                                  This must be one of the following:
+  * <dl>
+  * <dt>#OPUS_APPLICATION_VOIP</dt>
+  * <dd>Process signal for improved speech intelligibility.</dd>
+  * <dt>#OPUS_APPLICATION_AUDIO</dt>
+  * <dd>Favor faithfulness to the original input.</dd>
+  * <dt>#OPUS_APPLICATION_RESTRICTED_LOWDELAY</dt>
+  * <dd>Configure the minimum possible coding delay by disabling certain modes
+  * of operation.</dd>
+  * </dl>
+  * @param[out] error <tt>int *</tt>: Returns #OPUS_OK on success, or an error
+  *                                   code (see @ref opus_errorcodes) on
+  *                                   failure.
+  */
 OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusMSEncoder *opus_multistream_encoder_create(
-      opus_int32 Fs,            /**< Sampling rate of input signal (Hz) */
-      int channels,             /**< Number of channels in the input signal */
-      int streams,              /**< Total number of streams to encode from the input */
-      int coupled_streams,      /**< Number of coupled (stereo) streams to encode */
-      const unsigned char *mapping, /**< Encoded mapping between channels and streams */
-      int application,          /**< Coding mode (OPUS_APPLICATION_VOIP/OPUS_APPLICATION_AUDIO) */
-      int *error                /**< Error code */
+      opus_int32 Fs,
+      int channels,
+      int streams,
+      int coupled_streams,
+      const unsigned char *mapping,
+      int application,
+      int *error
 ) OPUS_ARG_NONNULL(5);
 
-/** Initialize an already allocated multistream encoder state. */
+OPUS_EXPORT OPUS_WARN_UNUSED_RESULT OpusMSEncoder *opus_multistream_surround_encoder_create(
+      opus_int32 Fs,
+      int channels,
+      int mapping_family,
+      int *streams,
+      int *coupled_streams,
+      unsigned char *mapping,
+      int application,
+      int *error
+) OPUS_ARG_NONNULL(5);
+
+/** Initialize a previously allocated multistream encoder state.
+  * 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_encoder_create
+  * @see opus_multistream_encoder_get_size
+  * @param st <tt>OpusMSEncoder*</tt>: Multistream encoder state to initialize.
+  * @param Fs <tt>opus_int32</tt>: Sampling rate of the input signal (in Hz).
+  *                                This must be one of 8000, 12000, 16000,
+  *                                24000, or 48000.
+  * @param channels <tt>int</tt>: Number of channels in the input signal.
+  *                               This must be at most 255.
+  *                               It may be greater than the number of
+  *                               coded channels (<code>streams +
+  *                               coupled_streams</code>).
+  * @param streams <tt>int</tt>: The total number of streams to encode from the
+  *                              input.
+  *                              This must be no more than the number of channels.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) must be no
+  *                                      more than the number of input channels.
+  * @param[in] mapping <code>const unsigned char[channels]</code>: 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 <tt>int</tt>: The target encoder application.
+  *                                  This must be one of the following:
+  * <dl>
+  * <dt>#OPUS_APPLICATION_VOIP</dt>
+  * <dd>Process signal for improved speech intelligibility.</dd>
+  * <dt>#OPUS_APPLICATION_AUDIO</dt>
+  * <dd>Favor faithfulness to the original input.</dd>
+  * <dt>#OPUS_APPLICATION_RESTRICTED_LOWDELAY</dt>
+  * <dd>Configure the minimum possible coding delay by disabling certain modes
+  * of operation.</dd>
+  * </dl>
+  * @returns #OPUS_OK on success, or an error code (see @ref opus_errorcodes)
+  *          on failure.
+  */
 OPUS_EXPORT int opus_multistream_encoder_init(
-      OpusMSEncoder *st,        /**< Encoder state */
-      opus_int32 Fs,            /**< Sampling rate of input signal (Hz) */
-      int channels,             /**< Number of channels in the input signal */
-      int streams,              /**< Total number of streams to encode from the input */
-      int coupled_streams,      /**< Number of coupled (stereo) streams to encode */
-      const unsigned char *mapping, /**< Encoded mapping between channels and streams */
-      int application           /**< Coding mode (OPUS_APPLICATION_VOIP/OPUS_APPLICATION_AUDIO) */
+      OpusMSEncoder *st,
+      opus_int32 Fs,
+      int channels,
+      int streams,
+      int coupled_streams,
+      const unsigned char *mapping,
+      int application
+) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(6);
+
+OPUS_EXPORT int opus_multistream_surround_encoder_init(
+      OpusMSEncoder *st,
+      opus_int32 Fs,
+      int channels,
+      int mapping_family,
+      int *streams,
+      int *coupled_streams,
+      unsigned char *mapping,
+      int application
 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(6);
 
-/** Returns length of the data payload (in bytes) or a negative error code */
+/** Encodes a multistream Opus frame.
+  * @param st <tt>OpusMSEncoder*</tt>: Multistream encoder state.
+  * @param[in] pcm <tt>const opus_int16*</tt>: The input signal as interleaved
+  *                                            samples.
+  *                                            This must contain
+  *                                            <code>frame_size*channels</code>
+  *                                            samples.
+  * @param frame_size <tt>int</tt>: 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 <tt>unsigned char*</tt>: Output payload.
+  *                                           This must contain storage for at
+  *                                           least \a max_data_bytes.
+  * @param [in] max_data_bytes <tt>opus_int32</tt>: 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,          /**< Encoder state */
-    const opus_int16 *pcm,      /**< Input signal as interleaved samples. Length is frame_size*channels */
-    int frame_size,             /**< Number of samples per frame of input signal */
-    unsigned char *data,        /**< Output buffer for the compressed payload (no more than max_data_bytes long) */
-    opus_int32 max_data_bytes   /**< Allocated memory for payload; don't use for controlling bitrate */
+    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);
 
-/** Returns length of the data payload (in bytes) or a negative error code. */
+/** Encodes a multistream Opus frame from floating point input.
+  * @param st <tt>OpusMSEncoder*</tt>: Multistream encoder state.
+  * @param[in] pcm <tt>const float*</tt>: 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
+  *                                       <code>frame_size*channels</code>
+  *                                       samples.
+  * @param frame_size <tt>int</tt>: 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 <tt>unsigned char*</tt>: Output payload.
+  *                                           This must contain storage for at
+  *                                           least \a max_data_bytes.
+  * @param [in] max_data_bytes <tt>opus_int32</tt>: 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,        /**< Encoder state */
-      const float *pcm,         /**< Input signal interleaved in channel order. length is frame_size*channels */
-      int frame_size,           /**< Number of samples per frame of input signal */
-      unsigned char *data,      /**< Output buffer for the compressed payload (no more than max_data_bytes long) */
-      opus_int32 max_data_bytes /**< Allocated memory for payload; don't use for controlling bitrate */
+      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);
 
-/** Gets the size of an OpusMSEncoder structure.
-  * @returns size
+/** Frees an <code>OpusMSEncoder</code> allocated by
+  * opus_multistream_encoder_create().
+  * @param st <tt>OpusMSEncoder*</tt>: Multistream encoder state to be freed.
   */
-OPUS_EXPORT OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_encoder_get_size(
-      int streams,              /**< Total number of coded streams */
-      int coupled_streams       /**< Number of coupled (stereo) streams */
-);
-
-/** Deallocate a multstream encoder state */
 OPUS_EXPORT void opus_multistream_encoder_destroy(OpusMSEncoder *st);
 
-/** Get or set options on a multistream encoder state */
+/** Perform a CTL function on a multistream Opus encoder.
+  *
+  * Generally the request and subsequent arguments are generated by a
+  * convenience macro.
+  * @param st <tt>OpusMSEncoder*</tt>: 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);
 
-/** Allocate and initialize a multistream decoder state object.
- *  Call opus_multistream_decoder_destroy() to release
- *  this object when finished. */
+/**@}*/
+
+/**\name Multistream decoder functions */
+/**@{*/
+
+/** Gets the size of an <code>OpusMSDecoder</code> structure.
+  * @param streams <tt>int</tt>: The total number of streams coded in the
+  *                              input.
+  *                              This must be no more than 255.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) 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 <tt>opus_int32</tt>: Sampling rate to decode at (in Hz).
+  *                                This must be one of 8000, 12000, 16000,
+  *                                24000, or 48000.
+  * @param channels <tt>int</tt>: Number of channels to output.
+  *                               This must be at most 255.
+  *                               It may be different from the number of coded
+  *                               channels (<code>streams +
+  *                               coupled_streams</code>).
+  * @param streams <tt>int</tt>: The total number of streams coded in the
+  *                              input.
+  *                              This must be no more than 255.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) must be no
+  *                                      more than 255.
+  * @param[in] mapping <code>const unsigned char[channels]</code>: Mapping from
+  *                    coded channels to output channels, as described in
+  *                    @ref opus_multistream.
+  * @param[out] error <tt>int *</tt>: 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,            /**< Sampling rate to decode at (Hz) */
-      int channels,             /**< Number of channels to decode */
-      int streams,              /**< Total number of coded streams in the multistream */
-      int coupled_streams,      /**< Number of coupled (stereo) streams in the multistream */
-      const unsigned char *mapping, /**< Stream to channel mapping table */
-      int *error                /**< Error code */
+      opus_int32 Fs,
+      int channels,
+      int streams,
+      int coupled_streams,
+      const unsigned char *mapping,
+      int *error
 ) OPUS_ARG_NONNULL(5);
 
-/** Intialize a previously allocated decoder state object. */
+/** Intialize 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 <tt>OpusMSEncoder*</tt>: Multistream encoder state to initialize.
+  * @param Fs <tt>opus_int32</tt>: Sampling rate to decode at (in Hz).
+  *                                This must be one of 8000, 12000, 16000,
+  *                                24000, or 48000.
+  * @param channels <tt>int</tt>: Number of channels to output.
+  *                               This must be at most 255.
+  *                               It may be different from the number of coded
+  *                               channels (<code>streams +
+  *                               coupled_streams</code>).
+  * @param streams <tt>int</tt>: The total number of streams coded in the
+  *                              input.
+  *                              This must be no more than 255.
+  * @param coupled_streams <tt>int</tt>: 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 (<code>streams +
+  *                                      coupled_streams</code>) must be no
+  *                                      more than 255.
+  * @param[in] mapping <code>const unsigned char[channels]</code>: 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,        /**< Encoder state */
-      opus_int32 Fs,            /**< Sample rate of input signal (Hz) */
-      int channels,             /**< Number of channels in the input signal */
-      int streams,              /**< Total number of coded streams */
-      int coupled_streams,      /**< Number of coupled (stereo) streams */
-      const unsigned char *mapping  /**< Stream to channel mapping table */
+      OpusMSDecoder *st,
+      opus_int32 Fs,
+      int channels,
+      int streams,
+      int coupled_streams,
+      const unsigned char *mapping
 ) OPUS_ARG_NONNULL(1) OPUS_ARG_NONNULL(6);
 
-/** Returns the number of samples decoded or a negative error code */
+/** Decode a multistream Opus packet.
+  * @param st <tt>OpusMSDecoder*</tt>: Multistream decoder state.
+  * @param[in] data <tt>const unsigned char*</tt>: Input payload.
+  *                                                Use a <code>NULL</code>
+  *                                                pointer to indicate packet
+  *                                                loss.
+  * @param len <tt>opus_int32</tt>: Number of bytes in payload.
+  * @param[out] pcm <tt>opus_int16*</tt>: Output signal, with interleaved
+  *                                       samples.
+  *                                       This must contain room for
+  *                                       <code>frame_size*channels</code>
+  *                                       samples.
+  * @param frame_size <tt>int</tt>: 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
+  *                                 <b>must</b> be a multiple of 2.5 ms.
+  * @param decode_fec <tt>int</tt>: 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,          /**< Decoder state */
-    const unsigned char *data,  /**< Input payload. Use a NULL pointer to indicate packet loss */
-    opus_int32 len,             /**< Number of bytes in payload */
-    opus_int16 *pcm,            /**< Output signal, samples interleaved in channel order . length is frame_size*channels */
-    int frame_size,             /**< Number of samples per frame of input signal */
-    int decode_fec              /**< Flag (0/1) 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. */
+    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);
 
-/** Returns the number of samples decoded or a negative error code */
+/** Decode a multistream Opus packet with floating point output.
+  * @param st <tt>OpusMSDecoder*</tt>: Multistream decoder state.
+  * @param[in] data <tt>const unsigned char*</tt>: Input payload.
+  *                                                Use a <code>NULL</code>
+  *                                                pointer to indicate packet
+  *                                                loss.
+  * @param len <tt>opus_int32</tt>: Number of bytes in payload.
+  * @param[out] pcm <tt>opus_int16*</tt>: Output signal, with interleaved
+  *                                       samples.
+  *                                       This must contain room for
+  *                                       <code>frame_size*channels</code>
+  *                                       samples.
+  * @param frame_size <tt>int</tt>: 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
+  *                                 <b>must</b> be a multiple of 2.5 ms.
+  * @param decode_fec <tt>int</tt>: 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,          /**< Decoder state */
-    const unsigned char *data,  /**< Input payload buffer. Use a NULL pointer to indicate packet loss */
-    opus_int32 len,             /**< Number of payload bytes in data */
-    float *pcm,                 /**< Buffer for the output signal (interleaved iin channel order). length is frame_size*channels */
-    int frame_size,             /**< Number of samples per frame of input signal */
-    int decode_fec              /**< Flag (0/1) 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. */
+    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);
 
-/** Gets the size of an OpusMSDecoder structure.
-  * @returns size
+/** Perform a CTL function on a multistream Opus decoder.
+  *
+  * Generally the request and subsequent arguments are generated by a
+  * convenience macro.
+  * @param st <tt>OpusMSDecoder*</tt>: 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 OPUS_WARN_UNUSED_RESULT opus_int32 opus_multistream_decoder_get_size(
-      int streams,              /**< Total number of coded streams */
-      int coupled_streams       /**< Number of coupled (stereo) streams */
-);
-
-/** Get or set options on a multistream decoder state */
 OPUS_EXPORT int opus_multistream_decoder_ctl(OpusMSDecoder *st, int request, ...) OPUS_ARG_NONNULL(1);
 
-/** Deallocate a multistream decoder state object */
+/** Frees an <code>OpusMSDecoder</code> allocated by
+  * opus_multistream_decoder_create().
+  * @param st <tt>OpusMSDecoder</tt>: Multistream decoder state to be freed.
+  */
 OPUS_EXPORT void opus_multistream_decoder_destroy(OpusMSDecoder *st);
 
+/**@}*/
+
+/**@}*/
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/thirdparty/lib32/libopus.a b/thirdparty/lib32/libopus.a
index ec2807f9..e520aad4 100644
--- a/thirdparty/lib32/libopus.a
+++ b/thirdparty/lib32/libopus.a
diff --git a/thirdparty/lib64/libopus.a b/thirdparty/lib64/libopus.a
index 727b511f..49411a3c 100644
--- a/thirdparty/lib64/libopus.a
+++ b/thirdparty/lib64/libopus.a