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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, changes = 0;
  30.     char last = 0;
  31.  
  32.     if (p->buf_size < 32)
  33.         return 0;
  34.  
  35.     for (i = 0; i < p->buf_size - 3; i+=32) {
  36.         if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
  37.             return 0;
  38.         if (p->buf[i] != last)
  39.             changes++;
  40.         last = p->buf[i];
  41.     }
  42.     if (changes <= 1)
  43.         return 0;
  44.  
  45.     return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
  46. }
  47.  
  48. static int adp_read_header(AVFormatContext *s)
  49. {
  50.     AVStream *st;
  51.  
  52.     st = avformat_new_stream(s, NULL);
  53.     if (!st)
  54.         return AVERROR(ENOMEM);
  55.  
  56.     st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
  57.     st->codec->codec_id       = AV_CODEC_ID_ADPCM_DTK;
  58.     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
  59.     st->codec->channels       = 2;
  60.     st->codec->sample_rate    = 48000;
  61.     st->start_time            = 0;
  62.     if (s->pb->seekable)
  63.         st->duration          = av_get_audio_frame_duration(st->codec, avio_size(s->pb));
  64.  
  65.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  66.  
  67.     return 0;
  68. }
  69.  
  70. static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
  71. {
  72.     int ret, size = 1024;
  73.  
  74.     if (avio_feof(s->pb))
  75.         return AVERROR_EOF;
  76.  
  77.     ret = av_get_packet(s->pb, pkt, size);
  78.  
  79.     if (ret != size) {
  80.         if (ret < 0) {
  81.             av_free_packet(pkt);
  82.             return ret;
  83.         }
  84.         av_shrink_packet(pkt, ret);
  85.     }
  86.     pkt->stream_index = 0;
  87.  
  88.     return ret;
  89. }
  90.  
  91. AVInputFormat ff_adp_demuxer = {
  92.     .name           = "adp",
  93.     .long_name      = NULL_IF_CONFIG_SMALL("ADP"),
  94.     .read_probe     = adp_probe,
  95.     .read_header    = adp_read_header,
  96.     .read_packet    = adp_read_packet,
  97.     .extensions     = "adp,dtk",
  98. };
  99.