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  1. /*
  2.  * Ensoniq Paris Audio File 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/intreadwrite.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25. #include "pcm.h"
  26.  
  27. static int epaf_probe(AVProbeData *p)
  28. {
  29.     if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
  30.           AV_RL32(p->buf + 8) == 1) ||
  31.          (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
  32.           AV_RN32(p->buf + 8) == 0)) &&
  33.        !AV_RN32(p->buf +  4) && AV_RN32(p->buf + 12) &&
  34.         AV_RN32(p->buf + 20))
  35.         return AVPROBE_SCORE_MAX / 4 * 3;
  36.     return 0;
  37. }
  38.  
  39. static int epaf_read_header(AVFormatContext *s)
  40. {
  41.     int le, sample_rate, codec, channels;
  42.     AVStream *st;
  43.  
  44.     avio_skip(s->pb, 4);
  45.     if (avio_rl32(s->pb))
  46.         return AVERROR_INVALIDDATA;
  47.  
  48.     le = avio_rl32(s->pb);
  49.     if (le && le != 1)
  50.         return AVERROR_INVALIDDATA;
  51.  
  52.     if (le) {
  53.         sample_rate = avio_rl32(s->pb);
  54.         codec       = avio_rl32(s->pb);
  55.         channels    = avio_rl32(s->pb);
  56.     } else {
  57.         sample_rate = avio_rb32(s->pb);
  58.         codec       = avio_rb32(s->pb);
  59.         channels    = avio_rb32(s->pb);
  60.     }
  61.  
  62.     if (!channels || !sample_rate)
  63.         return AVERROR_INVALIDDATA;
  64.  
  65.     st = avformat_new_stream(s, NULL);
  66.     if (!st)
  67.         return AVERROR(ENOMEM);
  68.  
  69.     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  70.     st->codec->channels    = channels;
  71.     st->codec->sample_rate = sample_rate;
  72.     switch (codec) {
  73.     case 0:
  74.         st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
  75.         break;
  76.     case 2:
  77.         st->codec->codec_id = AV_CODEC_ID_PCM_S8;
  78.         break;
  79.     case 1:
  80.         avpriv_request_sample(s, "24-bit Paris PCM format");
  81.     default:
  82.         return AVERROR_INVALIDDATA;
  83.     }
  84.  
  85.     st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  86.     st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
  87.  
  88.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  89.  
  90.     if (avio_skip(s->pb, 2024) < 0)
  91.         return AVERROR_INVALIDDATA;
  92.     return 0;
  93. }
  94.  
  95. AVInputFormat ff_epaf_demuxer = {
  96.     .name           = "epaf",
  97.     .long_name      = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
  98.     .read_probe     = epaf_probe,
  99.     .read_header    = epaf_read_header,
  100.     .read_packet    = ff_pcm_read_packet,
  101.     .read_seek      = ff_pcm_read_seek,
  102.     .extensions     = "paf,fap",
  103.     .flags          = AVFMT_GENERIC_INDEX,
  104. };
  105.