aac: split decoder into (sub)modules

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

diff --git a/nihav-mpeg/src/codecs/aac/tables.rs b/nihav-mpeg/src/codecs/aac/tables.rs
new file mode 100644 (file)
index 0000000..bff9130
--- /dev/null
+++ b/nihav-mpeg/src/codecs/aac/tables.rs
@@ -0,0 +1,114 @@
+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
+];