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  1. /*
  2.  * AFC demuxer
  3.  * Copyright (c) 2012 Paul B Mahol
  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 "libavutil/channel_layout.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25.  
  26. typedef struct AFCDemuxContext {
  27.     int64_t    data_end;
  28. } AFCDemuxContext;
  29.  
  30. static int afc_read_header(AVFormatContext *s)
  31. {
  32.     AFCDemuxContext *c = s->priv_data;
  33.     AVStream *st;
  34.  
  35.     st = avformat_new_stream(s, NULL);
  36.     if (!st)
  37.         return AVERROR(ENOMEM);
  38.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  39.     st->codec->codec_id   = AV_CODEC_ID_ADPCM_AFC;
  40.     st->codec->channels   = 2;
  41.     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  42.  
  43.     if (ff_alloc_extradata(st->codec, 1))
  44.         return AVERROR(ENOMEM);
  45.     st->codec->extradata[0] = 8 * st->codec->channels;
  46.  
  47.     c->data_end = avio_rb32(s->pb) + 32LL;
  48.     st->duration = avio_rb32(s->pb);
  49.     st->codec->sample_rate = avio_rb16(s->pb);
  50.     avio_skip(s->pb, 22);
  51.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  52.  
  53.     return 0;
  54. }
  55.  
  56. static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
  57. {
  58.     AFCDemuxContext *c = s->priv_data;
  59.     int64_t size;
  60.     int ret;
  61.  
  62.     size = FFMIN(c->data_end - avio_tell(s->pb), 18 * 128);
  63.     if (size <= 0)
  64.         return AVERROR_EOF;
  65.  
  66.     ret = av_get_packet(s->pb, pkt, size);
  67.     pkt->stream_index = 0;
  68.     return ret;
  69. }
  70.  
  71. AVInputFormat ff_afc_demuxer = {
  72.     .name           = "afc",
  73.     .long_name      = NULL_IF_CONFIG_SMALL("AFC"),
  74.     .priv_data_size = sizeof(AFCDemuxContext),
  75.     .read_header    = afc_read_header,
  76.     .read_packet    = afc_read_packet,
  77.     .extensions     = "afc",
  78.     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
  79. };
  80.