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  1. /*
  2.  * IEC 61937 common header
  3.  * Copyright (c) 2009 Bartlomiej Wolowiec
  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. #ifndef AVFORMAT_SPDIF_H
  23. #define AVFORMAT_SPDIF_H
  24.  
  25. #include <stdint.h>
  26. #include "avformat.h"
  27.  
  28. #define SYNCWORD1 0xF872
  29. #define SYNCWORD2 0x4E1F
  30. #define BURST_HEADER_SIZE 0x8
  31.  
  32. enum IEC61937DataType {
  33.     IEC61937_AC3                = 0x01,          ///< AC-3 data
  34.     IEC61937_MPEG1_LAYER1       = 0x04,          ///< MPEG-1 layer 1
  35.     IEC61937_MPEG1_LAYER23      = 0x05,          ///< MPEG-1 layer 2 or 3 data or MPEG-2 without extension
  36.     IEC61937_MPEG2_EXT          = 0x06,          ///< MPEG-2 data with extension
  37.     IEC61937_MPEG2_AAC          = 0x07,          ///< MPEG-2 AAC ADTS
  38.     IEC61937_MPEG2_LAYER1_LSF   = 0x08,          ///< MPEG-2, layer-1 low sampling frequency
  39.     IEC61937_MPEG2_LAYER2_LSF   = 0x09,          ///< MPEG-2, layer-2 low sampling frequency
  40.     IEC61937_MPEG2_LAYER3_LSF   = 0x0A,          ///< MPEG-2, layer-3 low sampling frequency
  41.     IEC61937_DTS1               = 0x0B,          ///< DTS type I   (512 samples)
  42.     IEC61937_DTS2               = 0x0C,          ///< DTS type II  (1024 samples)
  43.     IEC61937_DTS3               = 0x0D,          ///< DTS type III (2048 samples)
  44.     IEC61937_ATRAC              = 0x0E,          ///< ATRAC data
  45.     IEC61937_ATRAC3             = 0x0F,          ///< ATRAC3 data
  46.     IEC61937_ATRACX             = 0x10,          ///< ATRAC3+ data
  47.     IEC61937_DTSHD              = 0x11,          ///< DTS HD data
  48.     IEC61937_WMAPRO             = 0x12,          ///< WMA 9 Professional data
  49.     IEC61937_MPEG2_AAC_LSF_2048 = 0x13,          ///< MPEG-2 AAC ADTS half-rate low sampling frequency
  50.     IEC61937_MPEG2_AAC_LSF_4096 = 0x13 | 0x20,   ///< MPEG-2 AAC ADTS quarter-rate low sampling frequency
  51.     IEC61937_EAC3               = 0x15,          ///< E-AC-3 data
  52.     IEC61937_TRUEHD             = 0x16,          ///< TrueHD data
  53. };
  54.  
  55. static const uint16_t spdif_mpeg_pkt_offset[2][3] = {
  56.     //LAYER1  LAYER2  LAYER3
  57.     { 3072,    9216,   4608 }, // MPEG2 LSF
  58.     { 1536,    4608,   4608 }, // MPEG1
  59. };
  60.  
  61. void ff_spdif_bswap_buf16(uint16_t *dst, const uint16_t *src, int w);
  62. int ff_spdif_read_packet(AVFormatContext *s, AVPacket *pkt);
  63. int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec);
  64.  
  65. #endif /* AVFORMAT_SPDIF_H */
  66.