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/ IRIX Base Documentation 2002 November / SGI IRIX Base Documentation 2002 November.iso / usr / share / catman / p_man / cat3dm / dmedia / dmMPEG1AudioHeaderGetParams.z / dmMPEG1AudioHeaderGetParams
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Text File  |  2002-10-03  |  5.3 KB  |  133 lines
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  4. ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm))))              ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm))))
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  9.      dmMPEG1AudioHeaderGetParams - get decoder parameter information from a
  10.      header of any compressed MPEG1 audio data block.
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  13. SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
  14.      ####iiiinnnncccclllluuuuddddeeee <<<<ddddmmmmeeeeddddiiiiaaaa////ddddmmmmeeeeddddiiiiaaaa....hhhh>>>>
  15.      ####iiiinnnncccclllluuuuddddeeee <<<<ddddmmmmeeeeddddiiiiaaaa////ddddmmmm____aaaauuuuddddiiiioooouuuuttttiiiillll....hhhh>>>>
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  17.      DDDDMMMMssssttttaaaattttuuuussss ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((uuuunnnnssssiiiiggggnnnneeeedddd cccchhhhaaaarrrr ****ccccmmmmppppDDDDaaaattttaaaa,,,,
  18.                                           DDDDMMMMppppaaaarrrraaaammmmssss ****ppppaaaarrrraaaammmmssss))))
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  21. PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRR
  22.      _c_m_p_D_a_t_a
  23.           points to a block of data bytes presumed to constitute the
  24.           compressed data stream and start with a MPEG audio header.
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  27.      _p_a_r_a_m_s
  28.           List of parameters for specification.
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  31. RRRREEEETTTTUUUURRRRNNNNEEEEDDDD VVVVAAAALLLLUUUUEEEE
  32.      Returns DDDDMMMM____FFFFAAAAIIIILLLLUUUURRRREEEE or DDDDMMMM____SSSSUUUUCCCCCCCCEEEESSSSSSSS.
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  35. DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
  36.      ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm)))) extracts MPEG1 audio compression
  37.      parameter information from a header of a compressed data stream without
  38.      going so far as to decompress the data.  These parameter values are then
  39.      stored in DMparams *params structure and can be used to set decoder
  40.      parameters by a call to ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooDDDDeeeeccccooooddddeeeerrrrSSSSeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm)))).
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  42.      Extracted parameters from a compressed bit strem header are as follows:
  43.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____BBBBIIIITTTTRRRRAAAATTTT
  44.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____RRRRAAAATTTTEEEE
  45.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____CCCCHHHHAAAANNNNNNNNEEEELLLLSSSS
  46.           DDDDMMMM____MMMMPPPPEEEEGGGG1111____AAAAUUUUDDDDIIIIOOOO____LLLLAAAAYYYYEEEERRRR
  47.           DDDDMMMM____MMMMPPPPEEEEGGGG1111____AAAAUUUUDDDDIIIIOOOO____BBBBIIIITTTTRRRRAAAATTTTEEEE____PPPPOOOOLLLLIIIICCCCYYYY
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  49.      The other three parameter values are set to decoder defaults:
  50.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____FFFFOOOORRRRMMMMAAAATTTT
  51.           (set to DM_AUDIO_TWOS_COMPLEMENT)
  52.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____WWWWIIIIDDDDTTTTHHHH
  53.           (set to DM_AUDIO_WIDTH_16)
  54.           DDDDMMMM____AAAAUUUUDDDDIIIIOOOO____CCCCHHHHAAAANNNNNNNNEEEELLLL____PPPPOOOOLLLLIIIICCCCYYYY
  55.           (set to DM_MPEG1_AUDIO_CONSTANT_QUALITY)
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  63.                                                                         PPPPaaaaggggeeee 1111
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  70. ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm))))              ddddmmmmMMMMPPPPEEEEGGGG1111AAAAuuuuddddiiiiooooHHHHeeeeaaaaddddeeeerrrrGGGGeeeettttPPPPaaaarrrraaaammmmssss((((3333ddddmmmm))))
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  74. NNNNOOOOTTTTEEEE
  75. SSSSEEEEEEEE AAAALLLLSSSSOOOO
  76.      dmMPEG1AudioDecoderCreate(3dm), dmMPEG1AudioDecoderSetParams(3dm),
  77.      dmMPEG1AudioDecoderGetParams(3dm), dmMPEG1AudioDecode(3dm).
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  129.                                                                         PPPPaaaaggggeeee 2222
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