daud.c 2.8 KB

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  1. /*
  2. * D-Cinema audio demuxer
  3. * Copyright (c) 2005 Reimar Döffinger
  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. #include "avformat.h"
  22. static int daud_header(AVFormatContext *s, AVFormatParameters *ap) {
  23. AVStream *st = avformat_new_stream(s, NULL);
  24. if (!st)
  25. return AVERROR(ENOMEM);
  26. st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  27. st->codec->codec_id = CODEC_ID_PCM_S24DAUD;
  28. st->codec->codec_tag = MKTAG('d', 'a', 'u', 'd');
  29. st->codec->channels = 6;
  30. st->codec->sample_rate = 96000;
  31. st->codec->bit_rate = 3 * 6 * 96000 * 8;
  32. st->codec->block_align = 3 * 6;
  33. st->codec->bits_per_coded_sample = 24;
  34. return 0;
  35. }
  36. static int daud_packet(AVFormatContext *s, AVPacket *pkt) {
  37. AVIOContext *pb = s->pb;
  38. int ret, size;
  39. if (url_feof(pb))
  40. return AVERROR(EIO);
  41. size = avio_rb16(pb);
  42. avio_rb16(pb); // unknown
  43. ret = av_get_packet(pb, pkt, size);
  44. pkt->stream_index = 0;
  45. return ret;
  46. }
  47. static int daud_write_header(struct AVFormatContext *s)
  48. {
  49. AVCodecContext *codec = s->streams[0]->codec;
  50. if (codec->channels!=6 || codec->sample_rate!=96000)
  51. return -1;
  52. return 0;
  53. }
  54. static int daud_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  55. {
  56. if (pkt->size > 65535) {
  57. av_log(s, AV_LOG_ERROR,
  58. "Packet size too large for s302m. (%d > 65535)\n", pkt->size);
  59. return -1;
  60. }
  61. avio_wb16(s->pb, pkt->size);
  62. avio_wb16(s->pb, 0x8010); // unknown
  63. avio_write(s->pb, pkt->data, pkt->size);
  64. avio_flush(s->pb);
  65. return 0;
  66. }
  67. #if CONFIG_DAUD_DEMUXER
  68. AVInputFormat ff_daud_demuxer = {
  69. .name = "daud",
  70. .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
  71. .read_header = daud_header,
  72. .read_packet = daud_packet,
  73. .extensions = "302",
  74. };
  75. #endif
  76. #if CONFIG_DAUD_MUXER
  77. AVOutputFormat ff_daud_muxer = {
  78. .name = "daud",
  79. .long_name = NULL_IF_CONFIG_SMALL("D-Cinema audio format"),
  80. .extensions = "302",
  81. .audio_codec = CODEC_ID_PCM_S24DAUD,
  82. .video_codec = CODEC_ID_NONE,
  83. .write_header = daud_write_header,
  84. .write_packet = daud_write_packet,
  85. .flags = AVFMT_NOTIMESTAMPS,
  86. };
  87. #endif