Increase caps/allocation accuracy.
This stores the caps array in 32nd bits/sample instead of 1/2 bits scaled by LM and the channel count, which is slightly less less accurate for the last two bands, and much more accurate for all the other bands. A constant offset is subtracted to allow it to represent values larger than 255 in 8 bits (the range of unoffset values is 77...304). In addition, this replaces the last modeline in the allocation table with the caps array, allowing the initial interpolation to allocate 8 bits/sample or more, which was otherwise impossible.
This commit is contained in:
Timothy B. Terriberry
Jean-Marc Valin
parent
424eb74279
commit
ce6d0904a1
5 changed files with 25 additions and 18 deletions
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@ -756,6 +756,17 @@ static void tf_decode(int start, int end, int isTransient, int *tf_res, int LM,
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}
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}
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static void init_caps(const CELTMode *m,int *cap,int LM,int C)
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{
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int i;
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for (i=0;i<m->nbEBands;i++)
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{
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int N;
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N=(m->eBands[i+1]-m->eBands[i])<<LM;
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cap[i] = (m->cache.caps[m->nbEBands*(2*LM+C-1)+i]+64)*C*N>>2;
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}
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}
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static int alloc_trim_analysis(const CELTMode *m, const celt_norm *X,
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const celt_word16 *bandLogE, int nbEBands, int LM, int C, int N0)
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{
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@ -1229,9 +1240,7 @@ int celt_encode_with_ec_float(CELTEncoder * restrict st, const celt_sig * pcm, i
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ALLOC(cap, st->mode->nbEBands, int);
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ALLOC(offsets, st->mode->nbEBands, int);
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for (i=0;i<st->mode->nbEBands;i++)
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cap[i] = st->mode->cache.caps[st->mode->nbEBands*(2*LM+C-1)+i]
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<< C+LM+BITRES-2;
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init_caps(st->mode,cap,LM,C);
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for (i=0;i<st->mode->nbEBands;i++)
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offsets[i] = 0;
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/* Dynamic allocation code */
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@ -2294,9 +2303,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
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ALLOC(offsets, st->mode->nbEBands, int);
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ALLOC(fine_priority, st->mode->nbEBands, int);
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for (i=0;i<st->mode->nbEBands;i++)
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cap[i] = st->mode->cache.caps[st->mode->nbEBands*(2*LM+C-1)+i]
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<< C+LM+BITRES-2;
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init_caps(st->mode,cap,LM,C);
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dynalloc_logp = 6;
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total_bits<<=BITRES;
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@ -66,7 +66,7 @@ static const unsigned char band_allocation[] = {
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#else
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/* Alternate tuning (partially derived from Vorbis) */
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#define BITALLOC_SIZE 12
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#define BITALLOC_SIZE 11
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/* Bit allocation table in units of 1/32 bit/sample (0.1875 dB SNR) */
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static const unsigned char band_allocation[] = {
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/*0 200 400 600 800 1k 1.2 1.4 1.6 2k 2.4 2.8 3.2 4k 4.8 5.6 6.8 8k 9.6 12k 15.6 */
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@ -81,7 +81,6 @@ static const unsigned char band_allocation[] = {
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162,155,148,142,133,127,121,115,108,102, 96, 90, 84, 77, 71, 65, 59, 53, 46, 30, 1,
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172,165,158,152,143,137,131,125,118,112,106,100, 94, 87, 81, 75, 69, 63, 56, 45, 20,
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200,200,200,200,200,200,200,200,198,193,188,183,178,173,168,163,158,153,148,129,104,
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255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,251,251,239,204,129,104,
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};
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#endif
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@ -150,8 +150,6 @@ void compute_pulse_cache(CELTMode *m, int LM)
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{
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for (C=1;C<=2;C++)
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{
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int shift;
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shift = C+i+BITRES-2;
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for (j=0;j<m->nbEBands;j++)
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{
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int N0;
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@ -239,8 +237,10 @@ void compute_pulse_cache(CELTMode *m, int LM)
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celt_assert(qb >= 0);
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max_bits += C*qb<<BITRES;
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}
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celt_assert(max_bits>>shift < 256);
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*cap++ = (unsigned char)(max_bits>>shift);
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max_bits = (4*max_bits/(C*(m->eBands[j+1]-m->eBands[j]<<i)))-64;
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celt_assert(max_bits >= 0);
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celt_assert(max_bits < 256);
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*cap++ = (unsigned char)max_bits;
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}
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}
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}
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@ -580,7 +580,7 @@ int compute_allocation(const CELTMode *m, int start, int end, const int *offsets
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trim_offset[j] -= C<<BITRES;
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}
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lo = 1;
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hi = m->nbAllocVectors - 2;
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hi = m->nbAllocVectors - 1;
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do
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{
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int done = 0;
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@ -616,7 +616,8 @@ int compute_allocation(const CELTMode *m, int start, int end, const int *offsets
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{
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int N = m->eBands[j+1]-m->eBands[j];
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bits1[j] = C*N*m->allocVectors[lo*len+j]<<LM>>2;
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bits2[j] = C*N*m->allocVectors[hi*len+j]<<LM>>2;
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bits2[j] = hi>=m->nbAllocVectors ?
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cap[j] : C*N*m->allocVectors[hi*len+j]<<LM>>2;
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if (bits1[j] > 0)
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bits1[j] = IMAX(0, bits1[j] + trim_offset[j]);
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if (bits2[j] > 0)
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@ -22,7 +22,7 @@ static const celt_int16 cache_index50[105] = {
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static const unsigned char cache_bits50[392] = {
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40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28, 31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50, 51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65, 66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61, 64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92, 94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123, 124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94, 97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139, 142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35, 28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149, 153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225, 229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157, 166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63, 86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250, 25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180, 185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89, 110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41, 74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138, 163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214, 228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49, 90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47, 87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57, 106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187, 224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127, 182, 234, };
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static const unsigned char cache_caps50[168] = {
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18, 18, 18, 18, 18, 18, 18, 18, 28, 28, 28, 28, 62, 62, 62, 90, 90, 116, 148, 141, 139, 18, 18, 18, 18, 18, 18, 18, 18, 38, 38, 38, 38, 67, 67, 67, 98, 98, 123, 156, 146, 144, 14, 14, 14, 14, 14, 14, 14, 14, 31, 31, 31, 31, 64, 64, 64, 92, 92, 118, 151, 144, 141, 19, 19, 19, 19, 19, 19, 19, 19, 33, 33, 33, 33, 67, 67, 67, 96, 96, 122, 155, 147, 143, 15, 15, 15, 15, 15, 15, 15, 15, 32, 32, 32, 32, 64, 64, 64, 92, 92, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 66, 66, 66, 94, 94, 120, 153, 147, 143, 16, 16, 16, 16, 16, 16, 16, 16, 32, 32, 32, 32, 64, 64, 64, 93, 93, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 65, 65, 65, 94, 94, 119, 153, 146, 143, };
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224, 224, 224, 224, 224, 224, 224, 224, 160, 160, 160, 160, 185, 185, 185, 178, 178, 168, 134, 61, 37, 224, 224, 224, 224, 224, 224, 224, 224, 240, 240, 240, 240, 207, 207, 207, 198, 198, 183, 144, 66, 40, 160, 160, 160, 160, 160, 160, 160, 160, 185, 185, 185, 185, 193, 193, 193, 183, 183, 172, 138, 64, 38, 240, 240, 240, 240, 240, 240, 240, 240, 207, 207, 207, 207, 204, 204, 204, 193, 193, 180, 143, 66, 40, 185, 185, 185, 185, 185, 185, 185, 185, 193, 193, 193, 193, 193, 193, 193, 183, 183, 172, 138, 65, 39, 207, 207, 207, 207, 207, 207, 207, 207, 204, 204, 204, 204, 201, 201, 201, 188, 188, 176, 141, 66, 40, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 194, 194, 194, 184, 184, 173, 139, 65, 39, 204, 204, 204, 204, 204, 204, 204, 204, 201, 201, 201, 201, 198, 198, 198, 187, 187, 175, 140, 66, 40, };
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#endif
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#ifndef FFT_TWIDDLES48000_960
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@ -112,7 +112,7 @@ static const CELTMode mode48000_960_120 = {
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21, /* effEBands */
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{27853, 0, 4096, 8192, }, /* preemph */
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eband5ms, /* eBands */
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12, /* nbAllocVectors */
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11, /* nbAllocVectors */
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band_allocation, /* allocVectors */
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{1920, 3, {&fft_state48000_960_0, &fft_state48000_960_1, &fft_state48000_960_2, &fft_state48000_960_3, }, mdct_twiddles960}, /* mdct */
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window120, /* window */
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@ -22,7 +22,7 @@ static const celt_int16 cache_index50[105] = {
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static const unsigned char cache_bits50[392] = {
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40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28, 31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50, 51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65, 66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61, 64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92, 94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123, 124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94, 97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139, 142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35, 28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149, 153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225, 229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157, 166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63, 86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250, 25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180, 185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89, 110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41, 74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138, 163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214, 228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49, 90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47, 87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57, 106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187, 224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127, 182, 234, };
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static const unsigned char cache_caps50[168] = {
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18, 18, 18, 18, 18, 18, 18, 18, 28, 28, 28, 28, 62, 62, 62, 90, 90, 116, 148, 141, 139, 18, 18, 18, 18, 18, 18, 18, 18, 38, 38, 38, 38, 67, 67, 67, 98, 98, 123, 156, 146, 144, 14, 14, 14, 14, 14, 14, 14, 14, 31, 31, 31, 31, 64, 64, 64, 92, 92, 118, 151, 144, 141, 19, 19, 19, 19, 19, 19, 19, 19, 33, 33, 33, 33, 67, 67, 67, 96, 96, 122, 155, 147, 143, 15, 15, 15, 15, 15, 15, 15, 15, 32, 32, 32, 32, 64, 64, 64, 92, 92, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 66, 66, 66, 94, 94, 120, 153, 147, 143, 16, 16, 16, 16, 16, 16, 16, 16, 32, 32, 32, 32, 64, 64, 64, 93, 93, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 65, 65, 65, 94, 94, 119, 153, 146, 143, };
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224, 224, 224, 224, 224, 224, 224, 224, 160, 160, 160, 160, 185, 185, 185, 178, 178, 168, 134, 61, 37, 224, 224, 224, 224, 224, 224, 224, 224, 240, 240, 240, 240, 207, 207, 207, 198, 198, 183, 144, 66, 40, 160, 160, 160, 160, 160, 160, 160, 160, 185, 185, 185, 185, 193, 193, 193, 183, 183, 172, 138, 64, 38, 240, 240, 240, 240, 240, 240, 240, 240, 207, 207, 207, 207, 204, 204, 204, 193, 193, 180, 143, 66, 40, 185, 185, 185, 185, 185, 185, 185, 185, 193, 193, 193, 193, 193, 193, 193, 183, 183, 172, 138, 65, 39, 207, 207, 207, 207, 207, 207, 207, 207, 204, 204, 204, 204, 201, 201, 201, 188, 188, 176, 141, 66, 40, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 193, 194, 194, 194, 184, 184, 173, 139, 65, 39, 204, 204, 204, 204, 204, 204, 204, 204, 201, 201, 201, 201, 198, 198, 198, 187, 187, 175, 140, 66, 40, };
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#endif
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#ifndef FFT_TWIDDLES48000_960
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@ -116,7 +116,7 @@ static const CELTMode mode48000_960_120 = {
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21, /* effEBands */
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{0.850006, 0.000000, 1.000000, 1.000000, }, /* preemph */
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eband5ms, /* eBands */
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12, /* nbAllocVectors */
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11, /* nbAllocVectors */
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band_allocation, /* allocVectors */
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{1920, 3, {&fft_state48000_960_0, &fft_state48000_960_1, &fft_state48000_960_2, &fft_state48000_960_3, }, mdct_twiddles960}, /* mdct */
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window120, /* window */
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