libavformat/audiointerleave.h

   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 {
  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 int ff_interleave_compare_dts(AVFormatContext *s, AVPacket *next, AVPacket *pkt);
  43 /**
  44  * Rechunk audio PCM packets per AudioInterleaveContext->samples_per_frame
  45  * and interleave them correctly.
  46  * The first element of AVStream->priv_data must be AudioInterleaveContext
  47  * when using this function.
  48  *
  49  * @param get_packet function will output a packet when streams are correctly interleaved.
  50  * @param compare_ts function will compare AVPackets and decide interleaving order.
  51  */
  52 int ff_audio_rechunk_interleave(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush,
  53                         int (*get_packet)(AVFormatContext *, AVPacket *, AVPacket *, int),
  54                         int (*compare_ts)(AVFormatContext *, AVPacket *, AVPacket *));
  55
  56 #endif /* AVFORMAT_AUDIOINTERLEAVE_H */