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  1. /*
  2.  * ADP demuxer
  3.  * Copyright (c) 2013 James Almer
  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 "libavutil/intreadwrite.h"
  24. #include "avformat.h"
  25. #include "internal.h"
  26.  
  27. static int adp_probe(AVProbeData *p)
  28. {
  29.     int i;
  30.  
  31.     if (p->buf_size < 32)
  32.         return 0;
  33.  
  34.     for (i = 0; i < p->buf_size - 3; i+=32)
  35.         if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
  36.             return 0;
  37.  
  38.     return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
  39. }
  40.  
  41. static int adp_read_header(AVFormatContext *s)
  42. {
  43.     AVStream *st;
  44.  
  45.     st = avformat_new_stream(s, NULL);
  46.     if (!st)
  47.         return AVERROR(ENOMEM);
  48.  
  49.     st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
  50.     st->codec->codec_id       = AV_CODEC_ID_ADPCM_DTK;
  51.     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  52.     st->codec->channels       = 2;
  53.     st->codec->sample_rate    = 48000;
  54.     st->start_time            = 0;
  55.     if (s->pb->seekable)
  56.         st->duration          = av_get_audio_frame_duration(st->codec, avio_size(s->pb));
  57.  
  58.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  59.  
  60.     return 0;
  61. }
  62.  
  63. static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
  64. {
  65.     int ret, size = 1024;
  66.  
  67.     if (url_feof(s->pb))
  68.         return AVERROR_EOF;
  69.  
  70.     ret = av_get_packet(s->pb, pkt, size);
  71.  
  72.     if (ret != size) {
  73.         if (ret < 0) {
  74.             av_free_packet(pkt);
  75.             return ret;
  76.         }
  77.         av_shrink_packet(pkt, ret);
  78.     }
  79.     pkt->stream_index = 0;
  80.  
  81.     return ret;
  82. }
  83.  
  84. AVInputFormat ff_adp_demuxer = {
  85.     .name           = "adp",
  86.     .long_name      = NULL_IF_CONFIG_SMALL("ADP"),
  87.     .read_probe     = adp_probe,
  88.     .read_header    = adp_read_header,
  89.     .read_packet    = adp_read_packet,
  90.     .extensions     = "adp,dtk",
  91. };
  92.