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  1. /*
  2.  * TAK decoder/demuxer common code
  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. /**
  23.  * @file
  24.  * TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions
  25.  */
  26.  
  27. #ifndef AVCODEC_TAK_H
  28. #define AVCODEC_TAK_H
  29.  
  30. #include <stdint.h>
  31.  
  32. #define BITSTREAM_READER_LE
  33. #include "get_bits.h"
  34. #include "avcodec.h"
  35.  
  36. #define TAK_FORMAT_DATA_TYPE_BITS               3
  37. #define TAK_FORMAT_SAMPLE_RATE_BITS            18
  38. #define TAK_FORMAT_BPS_BITS                     5
  39. #define TAK_FORMAT_CHANNEL_BITS                 4
  40. #define TAK_FORMAT_VALID_BITS                   5
  41. #define TAK_FORMAT_CH_LAYOUT_BITS               6
  42. #define TAK_SIZE_FRAME_DURATION_BITS            4
  43. #define TAK_SIZE_SAMPLES_NUM_BITS              35
  44. #define TAK_LAST_FRAME_POS_BITS                40
  45. #define TAK_LAST_FRAME_SIZE_BITS               24
  46. #define TAK_ENCODER_CODEC_BITS                  6
  47. #define TAK_ENCODER_PROFILE_BITS                4
  48. #define TAK_ENCODER_VERSION_BITS               24
  49. #define TAK_SAMPLE_RATE_MIN                  6000
  50. #define TAK_CHANNELS_MIN                        1
  51. #define TAK_BPS_MIN                             8
  52. #define TAK_FRAME_HEADER_FLAGS_BITS             3
  53. #define TAK_FRAME_HEADER_SYNC_ID           0xA0FF
  54. #define TAK_FRAME_HEADER_SYNC_ID_BITS          16
  55. #define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS     14
  56. #define TAK_FRAME_HEADER_NO_BITS               21
  57. #define TAK_FRAME_DURATION_QUANT_SHIFT          5
  58. #define TAK_CRC24_BITS                         24
  59.  
  60.  
  61. #define TAK_FRAME_FLAG_IS_LAST                0x1
  62. #define TAK_FRAME_FLAG_HAS_INFO               0x2
  63. #define TAK_FRAME_FLAG_HAS_METADATA           0x4
  64.  
  65. #define TAK_MAX_CHANNELS               (1 << TAK_FORMAT_CHANNEL_BITS)
  66.  
  67. #define TAK_MIN_FRAME_HEADER_BITS      (TAK_FRAME_HEADER_SYNC_ID_BITS + \
  68.                                         TAK_FRAME_HEADER_FLAGS_BITS   + \
  69.                                         TAK_FRAME_HEADER_NO_BITS      + \
  70.                                         TAK_CRC24_BITS)
  71.  
  72. #define TAK_MIN_FRAME_HEADER_LAST_BITS (TAK_MIN_FRAME_HEADER_BITS + 2 + \
  73.                                         TAK_FRAME_HEADER_SAMPLE_COUNT_BITS)
  74.  
  75. #define TAK_ENCODER_BITS               (TAK_ENCODER_CODEC_BITS + \
  76.                                         TAK_ENCODER_PROFILE_BITS)
  77.  
  78. #define TAK_SIZE_BITS                  (TAK_SIZE_SAMPLES_NUM_BITS + \
  79.                                         TAK_SIZE_FRAME_DURATION_BITS)
  80.  
  81. #define TAK_FORMAT_BITS                (TAK_FORMAT_DATA_TYPE_BITS   + \
  82.                                         TAK_FORMAT_SAMPLE_RATE_BITS + \
  83.                                         TAK_FORMAT_BPS_BITS         + \
  84.                                         TAK_FORMAT_CHANNEL_BITS + 1 + \
  85.                                         TAK_FORMAT_VALID_BITS   + 1 + \
  86.                                         TAK_FORMAT_CH_LAYOUT_BITS   * \
  87.                                         TAK_MAX_CHANNELS)
  88.  
  89. #define TAK_STREAMINFO_BITS            (TAK_ENCODER_BITS + \
  90.                                         TAK_SIZE_BITS    + \
  91.                                         TAK_FORMAT_BITS)
  92.  
  93. #define TAK_MAX_FRAME_HEADER_BITS      (TAK_MIN_FRAME_HEADER_LAST_BITS + \
  94.                                         TAK_STREAMINFO_BITS + 31)
  95.  
  96. #define TAK_STREAMINFO_BYTES           ((TAK_STREAMINFO_BITS       + 7) / 8)
  97. #define TAK_MAX_FRAME_HEADER_BYTES     ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8)
  98. #define TAK_MIN_FRAME_HEADER_BYTES     ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8)
  99.  
  100. enum TAKCodecType {
  101.     TAK_CODEC_MONO_STEREO  = 2,
  102.     TAK_CODEC_MULTICHANNEL = 4,
  103. };
  104.  
  105. enum TAKMetaDataType {
  106.     TAK_METADATA_END = 0,
  107.     TAK_METADATA_STREAMINFO,
  108.     TAK_METADATA_SEEKTABLE,
  109.     TAK_METADATA_SIMPLE_WAVE_DATA,
  110.     TAK_METADATA_ENCODER,
  111.     TAK_METADATA_PADDING,
  112.     TAK_METADATA_MD5,
  113.     TAK_METADATA_LAST_FRAME,
  114. };
  115.  
  116. enum TAKFrameSizeType {
  117.     TAK_FST_94ms = 0,
  118.     TAK_FST_125ms,
  119.     TAK_FST_188ms,
  120.     TAK_FST_250ms,
  121.     TAK_FST_4096,
  122.     TAK_FST_8192,
  123.     TAK_FST_16384,
  124.     TAK_FST_512,
  125.     TAK_FST_1024,
  126.     TAK_FST_2048,
  127. };
  128.  
  129. typedef struct TAKStreamInfo {
  130.     int               flags;
  131.     enum TAKCodecType codec;
  132.     int               data_type;
  133.     int               sample_rate;
  134.     int               channels;
  135.     int               bps;
  136.     int               frame_num;
  137.     int               frame_samples;
  138.     int               last_frame_samples;
  139.     uint64_t          ch_layout;
  140.     int64_t           samples;
  141. } TAKStreamInfo;
  142.  
  143. int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size);
  144.  
  145. /**
  146.  * Parse the Streaminfo metadata block.
  147.  * @param[in]  gb pointer to GetBitContext
  148.  * @param[out] s  storage for parsed information
  149.  */
  150. void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s);
  151.  
  152. /**
  153.  * Validate and decode a frame header.
  154.  * @param      avctx             AVCodecContext to use as av_log() context
  155.  * @param[in]  gb                GetBitContext from which to read frame header
  156.  * @param[out] s                 frame information
  157.  * @param      log_level_offset  log level offset, can be used to silence
  158.  *                               error messages.
  159.  * @return non-zero on error, 0 if OK
  160.  */
  161. int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
  162.                                TAKStreamInfo *s, int log_level_offset);
  163. #endif /* AVCODEC_TAK_H */
  164.