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  1. /*
  2.  * IRCAM muxer
  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 "avio_internal.h"
  25. #include "internal.h"
  26. #include "rawenc.h"
  27. #include "ircam.h"
  28.  
  29. static int ircam_write_header(AVFormatContext *s)
  30. {
  31.     AVCodecContext *codec = s->streams[0]->codec;
  32.     uint32_t tag;
  33.  
  34.     if (s->nb_streams != 1) {
  35.         av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
  36.         return AVERROR(EINVAL);
  37.     }
  38.  
  39.     tag = ff_codec_get_tag(ff_codec_ircam_le_tags, codec->codec_id);
  40.     if (!tag) {
  41.         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
  42.         return AVERROR(EINVAL);
  43.     }
  44.  
  45.     avio_wl32(s->pb, 0x0001A364);
  46.     avio_wl32(s->pb, av_float2int(codec->sample_rate));
  47.     avio_wl32(s->pb, codec->channels);
  48.     avio_wl32(s->pb, tag);
  49.     ffio_fill(s->pb, 0, 1008);
  50.     return 0;
  51. }
  52.  
  53. AVOutputFormat ff_ircam_muxer = {
  54.     .name           = "ircam",
  55.     .extensions     = "sf,ircam",
  56.     .long_name      = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
  57.     .audio_codec    = AV_CODEC_ID_PCM_S16LE,
  58.     .video_codec    = AV_CODEC_ID_NONE,
  59.     .write_header   = ircam_write_header,
  60.     .write_packet   = ff_raw_write_packet,
  61.     .codec_tag      = (const AVCodecTag *const []){ ff_codec_ircam_le_tags, 0 },
  62. };
  63.