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556 lines
18 KiB
C
556 lines
18 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "quant_bands.h"
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#include "laplace.h"
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#include <math.h>
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#include "os_support.h"
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#include "arch.h"
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#include "mathops.h"
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#include "stack_alloc.h"
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#include "rate.h"
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#ifdef FIXED_POINT
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/* Mean energy in each band quantized in Q4 */
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const signed char eMeans[25] = {
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103,100, 92, 85, 81,
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77, 72, 70, 78, 75,
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73, 71, 78, 74, 69,
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72, 70, 74, 76, 71,
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60, 60, 60, 60, 60
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};
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#else
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/* Mean energy in each band quantized in Q4 and converted back to float */
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const opus_val16 eMeans[25] = {
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6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f,
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4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f,
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4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f,
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4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f,
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3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f
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};
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#endif
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/* prediction coefficients: 0.9, 0.8, 0.65, 0.5 */
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#ifdef FIXED_POINT
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static const opus_val16 pred_coef[4] = {29440, 26112, 21248, 16384};
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static const opus_val16 beta_coef[4] = {30147, 22282, 12124, 6554};
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static const opus_val16 beta_intra = 4915;
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#else
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static const opus_val16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
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static const opus_val16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.};
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static const opus_val16 beta_intra = 4915/32768.;
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#endif
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/*Parameters of the Laplace-like probability models used for the coarse energy.
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There is one pair of parameters for each frame size, prediction type
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(inter/intra), and band number.
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The first number of each pair is the probability of 0, and the second is the
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decay rate, both in Q8 precision.*/
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static const unsigned char e_prob_model[4][2][42] = {
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/*120 sample frames.*/
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{
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/*Inter*/
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{
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72, 127, 65, 129, 66, 128, 65, 128, 64, 128, 62, 128, 64, 128,
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64, 128, 92, 78, 92, 79, 92, 78, 90, 79, 116, 41, 115, 40,
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114, 40, 132, 26, 132, 26, 145, 17, 161, 12, 176, 10, 177, 11
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},
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/*Intra*/
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{
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24, 179, 48, 138, 54, 135, 54, 132, 53, 134, 56, 133, 55, 132,
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55, 132, 61, 114, 70, 96, 74, 88, 75, 88, 87, 74, 89, 66,
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91, 67, 100, 59, 108, 50, 120, 40, 122, 37, 97, 43, 78, 50
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}
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},
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/*240 sample frames.*/
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{
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/*Inter*/
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{
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83, 78, 84, 81, 88, 75, 86, 74, 87, 71, 90, 73, 93, 74,
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93, 74, 109, 40, 114, 36, 117, 34, 117, 34, 143, 17, 145, 18,
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146, 19, 162, 12, 165, 10, 178, 7, 189, 6, 190, 8, 177, 9
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},
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/*Intra*/
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{
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23, 178, 54, 115, 63, 102, 66, 98, 69, 99, 74, 89, 71, 91,
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73, 91, 78, 89, 86, 80, 92, 66, 93, 64, 102, 59, 103, 60,
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104, 60, 117, 52, 123, 44, 138, 35, 133, 31, 97, 38, 77, 45
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}
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},
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/*480 sample frames.*/
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{
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/*Inter*/
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{
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61, 90, 93, 60, 105, 42, 107, 41, 110, 45, 116, 38, 113, 38,
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112, 38, 124, 26, 132, 27, 136, 19, 140, 20, 155, 14, 159, 16,
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158, 18, 170, 13, 177, 10, 187, 8, 192, 6, 175, 9, 159, 10
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},
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/*Intra*/
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{
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21, 178, 59, 110, 71, 86, 75, 85, 84, 83, 91, 66, 88, 73,
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87, 72, 92, 75, 98, 72, 105, 58, 107, 54, 115, 52, 114, 55,
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112, 56, 129, 51, 132, 40, 150, 33, 140, 29, 98, 35, 77, 42
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}
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},
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/*960 sample frames.*/
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{
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/*Inter*/
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{
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42, 121, 96, 66, 108, 43, 111, 40, 117, 44, 123, 32, 120, 36,
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119, 33, 127, 33, 134, 34, 139, 21, 147, 23, 152, 20, 158, 25,
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154, 26, 166, 21, 173, 16, 184, 13, 184, 10, 150, 13, 139, 15
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},
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/*Intra*/
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{
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22, 178, 63, 114, 74, 82, 84, 83, 92, 82, 103, 62, 96, 72,
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96, 67, 101, 73, 107, 72, 113, 55, 118, 52, 125, 52, 118, 52,
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117, 55, 135, 49, 137, 39, 157, 32, 145, 29, 97, 33, 77, 40
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}
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}
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};
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static const unsigned char small_energy_icdf[3]={2,1,0};
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static opus_val32 loss_distortion(const opus_val16 *eBands, opus_val16 *oldEBands, int start, int end, int len, int C)
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{
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int c, i;
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opus_val32 dist = 0;
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c=0; do {
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for (i=start;i<end;i++)
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{
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opus_val16 d = SUB16(SHR16(eBands[i+c*len], 3), SHR16(oldEBands[i+c*len], 3));
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dist = MAC16_16(dist, d,d);
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}
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} while (++c<C);
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return MIN32(200,SHR32(dist,2*DB_SHIFT-6));
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}
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static int quant_coarse_energy_impl(const CELTMode *m, int start, int end,
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const opus_val16 *eBands, opus_val16 *oldEBands,
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opus_int32 budget, opus_int32 tell,
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const unsigned char *prob_model, opus_val16 *error, ec_enc *enc,
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int C, int LM, int intra, opus_val16 max_decay, int lfe)
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{
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int i, c;
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int badness = 0;
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opus_val32 prev[2] = {0,0};
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opus_val16 coef;
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opus_val16 beta;
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if (tell+3 <= budget)
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ec_enc_bit_logp(enc, intra, 3);
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if (intra)
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{
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coef = 0;
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beta = beta_intra;
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} else {
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beta = beta_coef[LM];
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coef = pred_coef[LM];
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}
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/* Encode at a fixed coarse resolution */
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for (i=start;i<end;i++)
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{
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c=0;
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do {
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int bits_left;
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int qi, qi0;
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opus_val32 q;
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opus_val16 x;
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opus_val32 f, tmp;
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opus_val16 oldE;
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opus_val16 decay_bound;
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x = eBands[i+c*m->nbEBands];
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oldE = MAX16(-QCONST16(9.f,DB_SHIFT), oldEBands[i+c*m->nbEBands]);
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#ifdef FIXED_POINT
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f = SHL32(EXTEND32(x),7) - PSHR32(MULT16_16(coef,oldE), 8) - prev[c];
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/* Rounding to nearest integer here is really important! */
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qi = (f+QCONST32(.5f,DB_SHIFT+7))>>(DB_SHIFT+7);
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decay_bound = EXTRACT16(MAX32(-QCONST16(28.f,DB_SHIFT),
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SUB32((opus_val32)oldEBands[i+c*m->nbEBands],max_decay)));
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#else
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f = x-coef*oldE-prev[c];
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/* Rounding to nearest integer here is really important! */
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qi = (int)floor(.5f+f);
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decay_bound = MAX16(-QCONST16(28.f,DB_SHIFT), oldEBands[i+c*m->nbEBands]) - max_decay;
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#endif
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/* Prevent the energy from going down too quickly (e.g. for bands
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that have just one bin) */
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if (qi < 0 && x < decay_bound)
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{
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qi += (int)SHR16(SUB16(decay_bound,x), DB_SHIFT);
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if (qi > 0)
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qi = 0;
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}
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qi0 = qi;
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/* If we don't have enough bits to encode all the energy, just assume
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something safe. */
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tell = ec_tell(enc);
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bits_left = budget-tell-3*C*(end-i);
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if (i!=start && bits_left < 30)
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{
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if (bits_left < 24)
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qi = IMIN(1, qi);
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if (bits_left < 16)
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qi = IMAX(-1, qi);
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}
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if (lfe && i>=2)
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qi = IMIN(qi, 0);
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if (budget-tell >= 15)
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{
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int pi;
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pi = 2*IMIN(i,20);
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ec_laplace_encode(enc, &qi,
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prob_model[pi]<<7, prob_model[pi+1]<<6);
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}
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else if(budget-tell >= 2)
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{
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qi = IMAX(-1, IMIN(qi, 1));
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ec_enc_icdf(enc, 2*qi^-(qi<0), small_energy_icdf, 2);
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}
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else if(budget-tell >= 1)
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{
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qi = IMIN(0, qi);
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ec_enc_bit_logp(enc, -qi, 1);
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}
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else
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qi = -1;
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error[i+c*m->nbEBands] = PSHR32(f,7) - SHL16(qi,DB_SHIFT);
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badness += abs(qi0-qi);
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q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);
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tmp = PSHR32(MULT16_16(coef,oldE),8) + prev[c] + SHL32(q,7);
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#ifdef FIXED_POINT
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tmp = MAX32(-QCONST32(28.f, DB_SHIFT+7), tmp);
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#endif
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oldEBands[i+c*m->nbEBands] = PSHR32(tmp, 7);
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prev[c] = prev[c] + SHL32(q,7) - MULT16_16(beta,PSHR32(q,8));
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} while (++c < C);
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}
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return lfe ? 0 : badness;
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}
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void quant_coarse_energy(const CELTMode *m, int start, int end, int effEnd,
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const opus_val16 *eBands, opus_val16 *oldEBands, opus_uint32 budget,
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opus_val16 *error, ec_enc *enc, int C, int LM, int nbAvailableBytes,
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int force_intra, opus_val32 *delayedIntra, int two_pass, int loss_rate, int lfe)
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{
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int intra;
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opus_val16 max_decay;
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VARDECL(opus_val16, oldEBands_intra);
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VARDECL(opus_val16, error_intra);
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ec_enc enc_start_state;
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opus_uint32 tell;
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int badness1=0;
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opus_int32 intra_bias;
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opus_val32 new_distortion;
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SAVE_STACK;
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intra = force_intra || (!two_pass && *delayedIntra>2*C*(end-start) && nbAvailableBytes > (end-start)*C);
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intra_bias = (opus_int32)((budget**delayedIntra*loss_rate)/(C*512));
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new_distortion = loss_distortion(eBands, oldEBands, start, effEnd, m->nbEBands, C);
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tell = ec_tell(enc);
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if (tell+3 > budget)
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two_pass = intra = 0;
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max_decay = QCONST16(16.f,DB_SHIFT);
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if (end-start>10)
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{
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#ifdef FIXED_POINT
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max_decay = MIN32(max_decay, SHL32(EXTEND32(nbAvailableBytes),DB_SHIFT-3));
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#else
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max_decay = MIN32(max_decay, .125f*nbAvailableBytes);
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#endif
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}
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if (lfe)
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max_decay = QCONST16(3.f,DB_SHIFT);
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enc_start_state = *enc;
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ALLOC(oldEBands_intra, C*m->nbEBands, opus_val16);
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ALLOC(error_intra, C*m->nbEBands, opus_val16);
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OPUS_COPY(oldEBands_intra, oldEBands, C*m->nbEBands);
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if (two_pass || intra)
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{
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badness1 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands_intra, budget,
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tell, e_prob_model[LM][1], error_intra, enc, C, LM, 1, max_decay, lfe);
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}
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if (!intra)
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{
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unsigned char *intra_buf;
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ec_enc enc_intra_state;
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opus_int32 tell_intra;
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opus_uint32 nstart_bytes;
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opus_uint32 nintra_bytes;
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opus_uint32 save_bytes;
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int badness2;
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VARDECL(unsigned char, intra_bits);
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tell_intra = ec_tell_frac(enc);
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enc_intra_state = *enc;
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nstart_bytes = ec_range_bytes(&enc_start_state);
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nintra_bytes = ec_range_bytes(&enc_intra_state);
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intra_buf = ec_get_buffer(&enc_intra_state) + nstart_bytes;
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save_bytes = nintra_bytes-nstart_bytes;
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if (save_bytes == 0)
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save_bytes = ALLOC_NONE;
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ALLOC(intra_bits, save_bytes, unsigned char);
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/* Copy bits from intra bit-stream */
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OPUS_COPY(intra_bits, intra_buf, nintra_bytes - nstart_bytes);
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*enc = enc_start_state;
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badness2 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands, budget,
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tell, e_prob_model[LM][intra], error, enc, C, LM, 0, max_decay, lfe);
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if (two_pass && (badness1 < badness2 || (badness1 == badness2 && ((opus_int32)ec_tell_frac(enc))+intra_bias > tell_intra)))
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{
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*enc = enc_intra_state;
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/* Copy intra bits to bit-stream */
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OPUS_COPY(intra_buf, intra_bits, nintra_bytes - nstart_bytes);
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OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
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OPUS_COPY(error, error_intra, C*m->nbEBands);
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intra = 1;
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}
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} else {
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OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
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OPUS_COPY(error, error_intra, C*m->nbEBands);
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}
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if (intra)
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*delayedIntra = new_distortion;
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else
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*delayedIntra = ADD32(MULT16_32_Q15(MULT16_16_Q15(pred_coef[LM], pred_coef[LM]),*delayedIntra),
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new_distortion);
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RESTORE_STACK;
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}
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void quant_fine_energy(const CELTMode *m, int start, int end, opus_val16 *oldEBands, opus_val16 *error, int *fine_quant, ec_enc *enc, int C)
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{
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int i, c;
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/* Encode finer resolution */
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for (i=start;i<end;i++)
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{
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opus_int16 frac = 1<<fine_quant[i];
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if (fine_quant[i] <= 0)
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continue;
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c=0;
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do {
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int q2;
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opus_val16 offset;
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#ifdef FIXED_POINT
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/* Has to be without rounding */
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q2 = (error[i+c*m->nbEBands]+QCONST16(.5f,DB_SHIFT))>>(DB_SHIFT-fine_quant[i]);
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#else
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q2 = (int)floor((error[i+c*m->nbEBands]+.5f)*frac);
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#endif
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if (q2 > frac-1)
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q2 = frac-1;
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if (q2<0)
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q2 = 0;
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ec_enc_bits(enc, q2, fine_quant[i]);
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#ifdef FIXED_POINT
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offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5f,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT));
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#else
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offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f;
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#endif
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oldEBands[i+c*m->nbEBands] += offset;
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error[i+c*m->nbEBands] -= offset;
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/*printf ("%f ", error[i] - offset);*/
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} while (++c < C);
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}
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}
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void quant_energy_finalise(const CELTMode *m, int start, int end, opus_val16 *oldEBands, opus_val16 *error, int *fine_quant, int *fine_priority, int bits_left, ec_enc *enc, int C)
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{
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int i, prio, c;
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/* Use up the remaining bits */
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for (prio=0;prio<2;prio++)
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{
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for (i=start;i<end && bits_left>=C ;i++)
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{
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if (fine_quant[i] >= MAX_FINE_BITS || fine_priority[i]!=prio)
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continue;
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c=0;
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do {
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int q2;
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opus_val16 offset;
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q2 = error[i+c*m->nbEBands]<0 ? 0 : 1;
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ec_enc_bits(enc, q2, 1);
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#ifdef FIXED_POINT
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offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5f,DB_SHIFT),fine_quant[i]+1);
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#else
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offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
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#endif
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oldEBands[i+c*m->nbEBands] += offset;
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bits_left--;
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} while (++c < C);
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}
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}
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}
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void unquant_coarse_energy(const CELTMode *m, int start, int end, opus_val16 *oldEBands, int intra, ec_dec *dec, int C, int LM)
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{
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const unsigned char *prob_model = e_prob_model[LM][intra];
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int i, c;
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opus_val32 prev[2] = {0, 0};
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opus_val16 coef;
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opus_val16 beta;
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opus_int32 budget;
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opus_int32 tell;
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if (intra)
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{
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coef = 0;
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beta = beta_intra;
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} else {
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beta = beta_coef[LM];
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coef = pred_coef[LM];
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}
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budget = dec->storage*8;
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/* Decode at a fixed coarse resolution */
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for (i=start;i<end;i++)
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{
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c=0;
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do {
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int qi;
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opus_val32 q;
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opus_val32 tmp;
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/* It would be better to express this invariant as a
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test on C at function entry, but that isn't enough
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to make the static analyzer happy. */
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celt_assert(c<2);
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tell = ec_tell(dec);
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if(budget-tell>=15)
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{
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int pi;
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pi = 2*IMIN(i,20);
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qi = ec_laplace_decode(dec,
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prob_model[pi]<<7, prob_model[pi+1]<<6);
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}
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else if(budget-tell>=2)
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{
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qi = ec_dec_icdf(dec, small_energy_icdf, 2);
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qi = (qi>>1)^-(qi&1);
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}
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else if(budget-tell>=1)
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{
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qi = -ec_dec_bit_logp(dec, 1);
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}
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else
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qi = -1;
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q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);
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oldEBands[i+c*m->nbEBands] = MAX16(-QCONST16(9.f,DB_SHIFT), oldEBands[i+c*m->nbEBands]);
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tmp = PSHR32(MULT16_16(coef,oldEBands[i+c*m->nbEBands]),8) + prev[c] + SHL32(q,7);
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#ifdef FIXED_POINT
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tmp = MAX32(-QCONST32(28.f, DB_SHIFT+7), tmp);
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#endif
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oldEBands[i+c*m->nbEBands] = PSHR32(tmp, 7);
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prev[c] = prev[c] + SHL32(q,7) - MULT16_16(beta,PSHR32(q,8));
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} while (++c < C);
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}
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}
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void unquant_fine_energy(const CELTMode *m, int start, int end, opus_val16 *oldEBands, int *fine_quant, ec_dec *dec, int C)
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{
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int i, c;
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/* Decode finer resolution */
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for (i=start;i<end;i++)
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{
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if (fine_quant[i] <= 0)
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continue;
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c=0;
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do {
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int q2;
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opus_val16 offset;
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q2 = ec_dec_bits(dec, fine_quant[i]);
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#ifdef FIXED_POINT
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offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5f,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT));
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#else
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offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f;
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#endif
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oldEBands[i+c*m->nbEBands] += offset;
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} while (++c < C);
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}
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}
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void unquant_energy_finalise(const CELTMode *m, int start, int end, opus_val16 *oldEBands, int *fine_quant, int *fine_priority, int bits_left, ec_dec *dec, int C)
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{
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int i, prio, c;
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/* Use up the remaining bits */
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for (prio=0;prio<2;prio++)
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{
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for (i=start;i<end && bits_left>=C ;i++)
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{
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if (fine_quant[i] >= MAX_FINE_BITS || fine_priority[i]!=prio)
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continue;
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c=0;
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do {
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int q2;
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opus_val16 offset;
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q2 = ec_dec_bits(dec, 1);
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#ifdef FIXED_POINT
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offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5f,DB_SHIFT),fine_quant[i]+1);
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#else
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offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
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#endif
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oldEBands[i+c*m->nbEBands] += offset;
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bits_left--;
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} while (++c < C);
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}
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}
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}
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void amp2Log2(const CELTMode *m, int effEnd, int end,
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celt_ener *bandE, opus_val16 *bandLogE, int C)
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{
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int c, i;
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c=0;
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do {
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for (i=0;i<effEnd;i++)
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bandLogE[i+c*m->nbEBands] =
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celt_log2(SHL32(bandE[i+c*m->nbEBands],2))
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- SHL16((opus_val16)eMeans[i],6);
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for (i=effEnd;i<end;i++)
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bandLogE[c*m->nbEBands+i] = -QCONST16(14.f,DB_SHIFT);
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} while (++c < C);
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}
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