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  1. /*
  2.  * audio interleaving prototypes and declarations
  3.  *
  4.  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVFORMAT_AUDIOINTERLEAVE_H
  24. #define AVFORMAT_AUDIOINTERLEAVE_H
  25.  
  26. #include "libavutil/fifo.h"
  27. #include "avformat.h"
  28.  
  29. typedef struct AudioInterleaveContext {
  30.     AVFifoBuffer *fifo;
  31.     unsigned fifo_size;           ///< size of currently allocated FIFO
  32.     uint64_t dts;                 ///< current dts
  33.     int sample_size;              ///< size of one sample all channels included
  34.     const int *samples_per_frame; ///< must be 0-terminated
  35.     const int *samples;           ///< current samples per frame, pointer to samples_per_frame
  36.     AVRational time_base;         ///< time base of output audio packets
  37. } AudioInterleaveContext;
  38.  
  39. int ff_audio_interleave_init(AVFormatContext *s, const int *samples_per_frame, AVRational time_base);
  40. void ff_audio_interleave_close(AVFormatContext *s);
  41.  
  42. /**
  43.  * Rechunk audio PCM packets per AudioInterleaveContext->samples_per_frame
  44.  * and interleave them correctly.
  45.  * The first element of AVStream->priv_data must be AudioInterleaveContext
  46.  * when using this function.
  47.  *
  48.  * @param get_packet function will output a packet when streams are correctly interleaved.
  49.  * @param compare_ts function will compare AVPackets and decide interleaving order.
  50.  */
  51. int ff_audio_rechunk_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush,
  52.                         int (*get_packet)(AVFormatContext *, AVPacket *, AVPacket *, int),
  53.                         int (*compare_ts)(AVFormatContext *, AVPacket *, AVPacket *));
  54.  
  55. #endif /* AVFORMAT_AUDIOINTERLEAVE_H */
  56.