nihav-mpeg/src/codecs/aac/tables.rs

   1 const SWB_OFFSET_48K_LONG: [usize; 49+1] = [
   2       0,   4,   8,  12,  16,  20,  24,  28,
   3      32,  36,  40,  48,  56,  64,  72,  80,
   4      88,  96, 108, 120, 132, 144, 160, 176,
   5     196, 216, 240, 264, 292, 320, 352, 384,
   6     416, 448, 480, 512, 544, 576, 608, 640,
   7     672, 704, 736, 768, 800, 832, 864, 896,
   8     928, 1024
   9 ];
  10 const SWB_OFFSET_48K_SHORT: [usize; 14+1] = [
  11     0, 4, 8, 12, 16, 20, 28, 36, 44, 56, 68, 80, 96, 112, 128
  12 ];
  13 const SWB_OFFSET_32K_LONG: [usize; 51+1] = [
  14       0,   4,   8,  12,  16,  20,  24,  28,
  15      32,  36,  40,  48,  56,  64,  72,  80,
  16      88,  96, 108, 120, 132, 144, 160, 176,
  17     196, 216, 240, 264, 292, 320, 352, 384,
  18     416, 448, 480, 512, 544, 576, 608, 640,
  19     672, 704, 736, 768, 800, 832, 864, 896,
  20     928, 960, 992, 1024
  21 ];
  22 const SWB_OFFSET_8K_LONG: [usize; 40+1] = [
  23       0,  12,  24,  36,  48,  60,  72,  84,
  24      96, 108, 120, 132, 144, 156, 172, 188,
  25     204, 220, 236, 252, 268, 288, 308, 328,
  26     348, 372, 396, 420, 448, 476, 508, 544,
  27     580, 620, 664, 712, 764, 820, 880, 944,
  28     1024
  29 ];
  30 const SWB_OFFSET_8K_SHORT: [usize; 15+1] = [
  31     0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 60, 72, 88, 108, 128
  32 ];
  33 const SWB_OFFSET_16K_LONG: [usize; 43+1] = [
  34       0,   8,  16,  24,  32,  40,  48,  56,
  35      64,  72,  80,  88, 100, 112, 124, 136,
  36     148, 160, 172, 184, 196, 212, 228, 244,
  37     260, 280, 300, 320, 344, 368, 396, 424,
  38     456, 492, 532, 572, 616, 664, 716, 772,
  39     832, 896, 960, 1024
  40 ];
  41 const SWB_OFFSET_16K_SHORT: [usize; 15+1] = [
  42     0, 4, 8, 12, 16, 20, 24, 28, 32, 40, 48, 60, 72, 88, 108, 128
  43 ];
  44 const SWB_OFFSET_24K_LONG: [usize; 47+1] = [
  45       0,   4,   8,  12,  16,  20,  24,  28,
  46      32,  36,  40,  44,  52,  60,  68,  76,
  47      84,  92, 100, 108, 116, 124, 136, 148,
  48     160, 172, 188, 204, 220, 240, 260, 284,
  49     308, 336, 364, 396, 432, 468, 508, 552,
  50     600, 652, 704, 768, 832, 896, 960, 1024
  51 ];
  52 const SWB_OFFSET_24K_SHORT: [usize; 15+1] = [
  53     0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 64, 76, 92, 108, 128
  54 ];
  55 const SWB_OFFSET_64K_LONG: [usize; 47+1] = [
  56       0,   4,   8,  12,  16,  20,  24,  28,
  57      32,  36,  40,  44,  48,  52,  56,  64,
  58      72,  80,  88, 100, 112, 124, 140, 156,
  59     172, 192, 216, 240, 268, 304, 344, 384,
  60     424, 464, 504, 544, 584, 624, 664, 704,
  61     744, 784, 824, 864, 904, 944, 984, 1024
  62 ];
  63 const SWB_OFFSET_64K_SHORT: [usize; 12+1] = [
  64     0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
  65 ];
  66 const SWB_OFFSET_96K_LONG: [usize; 41+1] = [
  67       0,   4,   8,  12,  16,  20,  24,  28,
  68      32,  36,  40,  44,  48,  52,  56,  64,
  69      72,  80,  88,  96, 108, 120, 132, 144,
  70     156, 172, 188, 212, 240, 276, 320, 384,
  71     448, 512, 576, 640, 704, 768, 832, 896,
  72     960, 1024
  73 ];
  74
  75 #[derive(Clone,Copy)]
  76 pub struct GASubbandInfo {
  77     pub min_srate:     u32,
  78     pub long_bands:    &'static [usize],
  79     pub short_bands:   &'static [usize],
  80 }
  81
  82 impl GASubbandInfo {
  83     pub fn find(srate: u32) -> GASubbandInfo {
  84         for sbi in AAC_SUBBAND_INFO.iter() {
  85             if srate >= sbi.min_srate {
  86                 return *sbi;
  87             }
  88         }
  89         unreachable!("")
  90     }
  91     pub fn find_idx(srate: u32) -> usize {
  92         for (i, sbi) in AAC_SUBBAND_INFO.iter().enumerate() {
  93             if srate >= sbi.min_srate {
  94                 return i;
  95             }
  96         }
  97         unreachable!("")
  98     }
  99 }
 100
 101 pub const AAC_SUBBAND_INFO: [GASubbandInfo; 12] = [
 102     GASubbandInfo { min_srate: 92017, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //96K
 103     GASubbandInfo { min_srate: 75132, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //88.2K
 104     GASubbandInfo { min_srate: 55426, long_bands: &SWB_OFFSET_64K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //64K
 105     GASubbandInfo { min_srate: 46009, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //48K
 106     GASubbandInfo { min_srate: 37566, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //44.1K
 107     GASubbandInfo { min_srate: 27713, long_bands: &SWB_OFFSET_32K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //32K
 108     GASubbandInfo { min_srate: 23004, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //24K
 109     GASubbandInfo { min_srate: 18783, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //22.05K
 110     GASubbandInfo { min_srate: 13856, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //16K
 111     GASubbandInfo { min_srate: 11502, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //12K
 112     GASubbandInfo { min_srate:  9391, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //11.025K
 113     GASubbandInfo { min_srate:     0, long_bands: &SWB_OFFSET_8K_LONG,  short_bands: &SWB_OFFSET_8K_SHORT  }, //8K
 114 ];