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dolby

dolby 2.4 KB
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  1. 

  2. #------------------------------------------------------------------------------
    3. 

  3. # $File: dolby,v 1.5 2009/09/19 16:28:08 christos Exp $
    4. 

  4. # ATSC A/53 aka AC-3 aka Dolby Digital <ashitaka@gmx.at>
    5. 

  5. # from http://www.atsc.org/standards/a_52a.pdf
    6. 

  6. # corrections, additions, etc. are always welcome!
    7. 

  7. #
    8. 

  8. # syncword
    9. 

  9. 0       beshort         0x0b77  ATSC A/52 aka AC-3 aka Dolby Digital stream,
    10. 

  10. # fscod
    11. 

  11. >4      byte&0xc0       0x00    48 kHz,
    12. 

  12. >4      byte&0xc0       0x40    44.1 kHz,
    13. 

  13. >4      byte&0xc0       0x80    32 kHz,
    14. 

  14. # is this one used for 96 kHz?
    15. 

  15. >4      byte&0xc0       0xc0    reserved frequency,
    16. 

  16. #
    17. 

  17. >5	byte&7 = 0		\b, complete main (CM)
    18. 

  18. >5	byte&7 = 1		\b, music and effects (ME)
    19. 

  19. >5	byte&7 = 2		\b, visually impaired (VI)
    20. 

  20. >5	byte&7 = 3		\b, hearing impaired (HI)
    21. 

  21. >5	byte&7 = 4		\b, dialogue (D)
    22. 

  22. >5	byte&7 = 5		\b, commentary (C)
    23. 

  23. >5	byte&7 = 6		\b, emergency (E)
    24. 

  24. # acmod
    25. 

  25. >6      byte&0xe0       0x00    1+1 front,
    26. 

  26. >6      byte&0xe0       0x20    1 front/0 rear,
    27. 

  27. >6      byte&0xe0       0x40    2 front/0 rear,
    28. 

  28. >6      byte&0xe0       0x60    3 front/0 rear,
    29. 

  29. >6      byte&0xe0       0x80    2 front/1 rear,
    30. 

  30. >6      byte&0xe0       0xa0    3 front/1 rear,
    31. 

  31. >6      byte&0xe0       0xc0    2 front/2 rear,
    32. 

  32. >6      byte&0xe0       0xe0    3 front/2 rear,
    33. 

  33. # lfeon (these may be incorrect)
    34. 

  34. >7      byte&0x40       0x00    LFE off,
    35. 

  35. >7      byte&0x40       0x40    LFE on,
    36. 

  36. #
    37. 

  37. >4	byte&0x3e = 0x00	\b, 32 kbit/s
    38. 

  38. >4	byte&0x3e = 0x02        \b, 40 kbit/s
    39. 

  39. >4	byte&0x3e = 0x04        \b, 48 kbit/s
    40. 

  40. >4	byte&0x3e = 0x06        \b, 56 kbit/s
    41. 

  41. >4	byte&0x3e = 0x08        \b, 64 kbit/s
    42. 

  42. >4	byte&0x3e = 0x0a        \b, 80 kbit/s
    43. 

  43. >4	byte&0x3e = 0x0c        \b, 96 kbit/s
    44. 

  44. >4	byte&0x3e = 0x0e        \b, 112 kbit/s
    45. 

  45. >4	byte&0x3e = 0x10        \b, 128 kbit/s
    46. 

  46. >4	byte&0x3e = 0x12        \b, 160 kbit/s
    47. 

  47. >4	byte&0x3e = 0x14        \b, 192 kbit/s
    48. 

  48. >4	byte&0x3e = 0x16        \b, 224 kbit/s
    49. 

  49. >4	byte&0x3e = 0x18        \b, 256 kbit/s
    50. 

  50. >4	byte&0x3e = 0x1a        \b, 320 kbit/s
    51. 

  51. >4	byte&0x3e = 0x1c        \b, 384 kbit/s
    52. 

  52. >4	byte&0x3e = 0x1e        \b, 448 kbit/s
    53. 

  53. >4	byte&0x3e = 0x20        \b, 512 kbit/s
    54. 

  54. >4	byte&0x3e = 0x22        \b, 576 kbit/s
    55. 

  55. >4	byte&0x3e = 0x24        \b, 640 kbit/s
    56. 

  56. # dsurmod (these may be incorrect)
    57. 

  57. >6      beshort&0x0180  0x0000  Dolby Surround not indicated
    58. 

  58. >6      beshort&0x0180  0x0080  not Dolby Surround encoded
    59. 

  59. >6      beshort&0x0180  0x0100  Dolby Surround encoded
    60. 

  60. >6      beshort&0x0180  0x0180  reserved Dolby Surround mode
    61.