Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * IRCAM 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. #include "ircam.h"
  27.  
  28. static int ircam_probe(AVProbeData *p)
  29. {
  30.     if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
  31.          p->buf[2] >=    1 && p->buf[2] <= 4) ||
  32.         (p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
  33.          p->buf[1] >=    1 && p->buf[1] <= 3) &&
  34.         AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
  35.         return AVPROBE_SCORE_MAX / 4 * 3;
  36.     return 0;
  37. }
  38.  
  39. static const struct endianess {
  40.     uint32_t magic;
  41.     int      is_le;
  42. } table[] = {
  43.   { 0x64A30100, 0 },
  44.   { 0x64A30200, 1 },
  45.   { 0x64A30300, 0 },
  46.   { 0x64A30400, 1 },
  47.   { 0x0001A364, 1 },
  48.   { 0x0002A364, 0 },
  49.   { 0x0003A364, 1 },
  50. };
  51.  
  52. static int ircam_read_header(AVFormatContext *s)
  53. {
  54.     uint32_t magic, sample_rate, channels, tag;
  55.     const AVCodecTag *tags;
  56.     int le = -1, i;
  57.     AVStream *st;
  58.  
  59.     magic = avio_rl32(s->pb);
  60.     for (i = 0; i < 7; i++) {
  61.         if (magic == table[i].magic) {
  62.             le = table[i].is_le;
  63.             break;
  64.         }
  65.     }
  66.  
  67.     if (le == 1) {
  68.         sample_rate = av_int2float(avio_rl32(s->pb));
  69.         channels    = avio_rl32(s->pb);
  70.         tag         = avio_rl32(s->pb);
  71.         tags        = ff_codec_ircam_le_tags;
  72.     } else if (le == 0) {
  73.         sample_rate = av_int2float(avio_rb32(s->pb));
  74.         channels    = avio_rb32(s->pb);
  75.         tag         = avio_rb32(s->pb);
  76.         tags        = ff_codec_ircam_be_tags;
  77.     } else {
  78.         return AVERROR_INVALIDDATA;
  79.     }
  80.  
  81.     if (!channels || !sample_rate)
  82.         return AVERROR_INVALIDDATA;
  83.  
  84.     st = avformat_new_stream(s, NULL);
  85.     if (!st)
  86.         return AVERROR(ENOMEM);
  87.  
  88.     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  89.     st->codec->channels    = channels;
  90.     st->codec->sample_rate = sample_rate;
  91.  
  92.     st->codec->codec_id = ff_codec_get_id(tags, tag);
  93.     if (st->codec->codec_id == AV_CODEC_ID_NONE) {
  94.         av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
  95.         return AVERROR_INVALIDDATA;
  96.     }
  97.  
  98.     st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
  99.     st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
  100.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  101.     avio_skip(s->pb, 1008);
  102.  
  103.     return 0;
  104. }
  105.  
  106. AVInputFormat ff_ircam_demuxer = {
  107.     .name           = "ircam",
  108.     .long_name      = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
  109.     .read_probe     = ircam_probe,
  110.     .read_header    = ircam_read_header,
  111.     .read_packet    = ff_pcm_read_packet,
  112.     .read_seek      = ff_pcm_read_seek,
  113.     .extensions     = "sf,ircam",
  114.     .flags          = AVFMT_GENERIC_INDEX,
  115. };
  116.