include/opus_multistream.h

/* Copyright (c) 2011 Xiph.Org Foundation
   Written by Jean-Marc Valin */
/*
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*/

/**
 * @file opus_multistream.h
 * @brief Opus reference implementation multistream API
 */

#ifndef OPUS_MULTISTREAM_H
#define OPUS_MULTISTREAM_H

#include "opus.h"

typedef struct OpusMSEncoder OpusMSEncoder;
typedef struct OpusMSDecoder OpusMSDecoder;

#define __opus_check_encstate_ptr(ptr) ((ptr) + ((ptr) - (OpusEncoder**)(ptr)))
#define __opus_check_decstate_ptr(ptr) ((ptr) + ((ptr) - (OpusDecoder**)(ptr)))

#define OPUS_MULTISTREAM_GET_ENCODER_STATE_REQUEST 5120
#define OPUS_MULTISTREAM_GET_DECODER_STATE_REQUEST 5122

#define OPUS_MULTISTREAM_GET_ENCODER_STATE(x,y) OPUS_MULTISTREAM_GET_ENCODER_STATE_REQUEST, __opus_check_int(x), __opus_check_encstate_ptr(y)
#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. */
OPUS_EXPORT 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 */
      unsigned char *mapping,   /**< Encoded mapping between channels and streams */
      int application,          /**< Coding mode (OPUS_APPLICATION_VOIP/OPUS_APPLICATION_AUDIO) */
      int *error                /**< Error code */
);

/** Initialize an already allocated multistream encoder state. */
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 */
      unsigned char *mapping,   /**< Encoded mapping between channels and streams */
      int application           /**< Coding mode (OPUS_APPLICATION_VOIP/OPUS_APPLICATION_AUDIO) */
);

/** Returns length of the data payload (in bytes) or a negative error code */
OPUS_EXPORT 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) */
    int max_data_bytes          /**< Allocated memory for payload; don't use for controlling bitrate */
);

/** Returns length of the data payload (in bytes) or a negative error code. */
OPUS_EXPORT 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) */
      int max_data_bytes        /**< Allocated memory for payload; don't use for controlling bitrate */
  );

/** Gets the size of an OpusMSEncoder structure.
  * @returns size
  */
OPUS_EXPORT 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 */
OPUS_EXPORT int opus_multistream_encoder_ctl(OpusMSEncoder *st, int request, ...);

/** Allocate and initialize a multistream decoder state object.
 *  Call opus_multistream_decoder_destroy() to release
 *  this object when finished. */
OPUS_EXPORT 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 */
      unsigned char *mapping,   /**< Stream to channel mapping table */
      int *error                /**< Error code */
);

/** Intialize a previously allocated decoder state object. */
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 */
      unsigned char *mapping    /**< Stream to channel mapping table */
);

/** Returns the number of samples decoded or a negative error code */
OPUS_EXPORT int opus_multistream_decode(
    OpusMSDecoder *st,          /**< Decoder state */
    const unsigned char *data,  /**< Input payload. Use a NULL pointer to indicate packet loss */
    int 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. */
);

/** Returns the number of samples decoded or a negative error code */
OPUS_EXPORT int opus_multistream_decode_float(
    OpusMSDecoder *st,          /**< Decoder state */
    const unsigned char *data,  /**< Input payload buffer. Use a NULL pointer to indicate packet loss */
    int 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. */
);

/** Gets the size of an OpusMSDecoder structure.
  * @returns size
  */
OPUS_EXPORT 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, ...);

/** Deallocate a multistream decoder state object */
OPUS_EXPORT void opus_multistream_decoder_destroy(OpusMSDecoder *st);

#endif /* OPUS_MULTISTREAM_H */