libavformat/g722.c

   1 /*
   2  * g722 raw demuxer
   3  * Copyright (c) 2010 Martin Storsjo
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "demux.h"
  24 #include "internal.h"
  25 #include "rawdec.h"
  26
  27 static int g722_read_header(AVFormatContext *s)
  28 {
  29     AVStream *st;
  30
  31     st = avformat_new_stream(s, NULL);
  32     if (!st)
  33         return AVERROR(ENOMEM);
  34
  35     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
  36     st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_G722;
  37     st->codecpar->sample_rate = 16000;
  38     st->codecpar->ch_layout   = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
  39
  40     st->codecpar->bits_per_coded_sample = 4;
  41
  42     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
  43     return 0;
  44 }
  45
  46 const FFInputFormat ff_g722_demuxer = {
  47     .p.name         = "g722",
  48     .p.long_name    = NULL_IF_CONFIG_SMALL("raw G.722"),
  49     .p.flags        = AVFMT_GENERIC_INDEX,
  50     .p.extensions   = "g722,722",
  51     .p.priv_class   = &ff_raw_demuxer_class,
  52     .read_header    = g722_read_header,
  53     .read_packet    = ff_raw_read_partial_packet,
  54     .raw_codec_id   = AV_CODEC_ID_ADPCM_G722,
  55     .priv_data_size = sizeof(FFRawDemuxerContext),
  56 };