aac: do not add 16 to large coefficients

[nihav.git] / nihav-mpeg / src / codecs / aac / tables.rs

const SWB_OFFSET_48K_LONG: [usize; 49+1] = [
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  48,  56,  64,  72,  80,
     88,  96, 108, 120, 132, 144, 160, 176,
    196, 216, 240, 264, 292, 320, 352, 384,
    416, 448, 480, 512, 544, 576, 608, 640,
    672, 704, 736, 768, 800, 832, 864, 896,
    928, 1024
];
const SWB_OFFSET_48K_SHORT: [usize; 14+1] = [
    0, 4, 8, 12, 16, 20, 28, 36, 44, 56, 68, 80, 96, 112, 128
];
const SWB_OFFSET_32K_LONG: [usize; 51+1] = [
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  48,  56,  64,  72,  80,
     88,  96, 108, 120, 132, 144, 160, 176,
    196, 216, 240, 264, 292, 320, 352, 384,
    416, 448, 480, 512, 544, 576, 608, 640,
    672, 704, 736, 768, 800, 832, 864, 896,
    928, 960, 992, 1024
];
const SWB_OFFSET_8K_LONG: [usize; 40+1] = [
      0,  12,  24,  36,  48,  60,  72,  84,
     96, 108, 120, 132, 144, 156, 172, 188,
    204, 220, 236, 252, 268, 288, 308, 328,
    348, 372, 396, 420, 448, 476, 508, 544,
    580, 620, 664, 712, 764, 820, 880, 944,
    1024
];
const SWB_OFFSET_8K_SHORT: [usize; 15+1] = [
    0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 60, 72, 88, 108, 128
];
const SWB_OFFSET_16K_LONG: [usize; 43+1] = [
      0,   8,  16,  24,  32,  40,  48,  56,
     64,  72,  80,  88, 100, 112, 124, 136,
    148, 160, 172, 184, 196, 212, 228, 244,
    260, 280, 300, 320, 344, 368, 396, 424,
    456, 492, 532, 572, 616, 664, 716, 772,
    832, 896, 960, 1024
];
const SWB_OFFSET_16K_SHORT: [usize; 15+1] = [
    0, 4, 8, 12, 16, 20, 24, 28, 32, 40, 48, 60, 72, 88, 108, 128
];
const SWB_OFFSET_24K_LONG: [usize; 47+1] = [
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  52,  60,  68,  76,
     84,  92, 100, 108, 116, 124, 136, 148,
    160, 172, 188, 204, 220, 240, 260, 284,
    308, 336, 364, 396, 432, 468, 508, 552,
    600, 652, 704, 768, 832, 896, 960, 1024
];
const SWB_OFFSET_24K_SHORT: [usize; 15+1] = [
    0, 4, 8, 12, 16, 20, 24, 28, 36, 44, 52, 64, 76, 92, 108, 128
];
const SWB_OFFSET_64K_LONG: [usize; 47+1] = [
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  48,  52,  56,  64,
     72,  80,  88, 100, 112, 124, 140, 156,
    172, 192, 216, 240, 268, 304, 344, 384,
    424, 464, 504, 544, 584, 624, 664, 704,
    744, 784, 824, 864, 904, 944, 984, 1024
];
const SWB_OFFSET_64K_SHORT: [usize; 12+1] = [
    0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
];
const SWB_OFFSET_96K_LONG: [usize; 41+1] = [
      0,   4,   8,  12,  16,  20,  24,  28,
     32,  36,  40,  44,  48,  52,  56,  64,
     72,  80,  88,  96, 108, 120, 132, 144,
    156, 172, 188, 212, 240, 276, 320, 384,
    448, 512, 576, 640, 704, 768, 832, 896,
    960, 1024
];

#[derive(Clone,Copy)]
pub struct GASubbandInfo {
    pub min_srate:     u32,
    pub long_bands:    &'static [usize],
    pub short_bands:   &'static [usize],
}

impl GASubbandInfo {
    pub fn find(srate: u32) -> GASubbandInfo {
        for sbi in AAC_SUBBAND_INFO.iter() {
            if srate >= sbi.min_srate {
                return *sbi;
            }
        }
        unreachable!("")
    }
    pub fn find_idx(srate: u32) -> usize {
        for (i, sbi) in AAC_SUBBAND_INFO.iter().enumerate() {
            if srate >= sbi.min_srate {
                return i;
            }
        }
        unreachable!("")
    }
}

pub const AAC_SUBBAND_INFO: [GASubbandInfo; 12] = [
    GASubbandInfo { min_srate: 92017, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //96K
    GASubbandInfo { min_srate: 75132, long_bands: &SWB_OFFSET_96K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //88.2K
    GASubbandInfo { min_srate: 55426, long_bands: &SWB_OFFSET_64K_LONG, short_bands: &SWB_OFFSET_64K_SHORT }, //64K
    GASubbandInfo { min_srate: 46009, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //48K
    GASubbandInfo { min_srate: 37566, long_bands: &SWB_OFFSET_48K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //44.1K
    GASubbandInfo { min_srate: 27713, long_bands: &SWB_OFFSET_32K_LONG, short_bands: &SWB_OFFSET_48K_SHORT }, //32K
    GASubbandInfo { min_srate: 23004, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //24K
    GASubbandInfo { min_srate: 18783, long_bands: &SWB_OFFSET_24K_LONG, short_bands: &SWB_OFFSET_24K_SHORT }, //22.05K
    GASubbandInfo { min_srate: 13856, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //16K
    GASubbandInfo { min_srate: 11502, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //12K
    GASubbandInfo { min_srate:  9391, long_bands: &SWB_OFFSET_16K_LONG, short_bands: &SWB_OFFSET_16K_SHORT }, //11.025K
    GASubbandInfo { min_srate:     0, long_bands: &SWB_OFFSET_8K_LONG,  short_bands: &SWB_OFFSET_8K_SHORT  }, //8K
];