a093f4df74
This unifies the byte buffer, encoder, and decoder into a single
struct.
The common encoder and decoder functions (such as ec_tell()) can
operate on either one, simplifying code which uses both.
The precision argument to ec_tell() has been removed.
It now comes in two precisions:
ec_tell() gives 1 bit precision in two operations, and
ec_tell_frac() gives 1/8th bit precision in... somewhat more.
ec_{enc|dec}_bit_prob() were removed (they are no longer needed).
Some of the byte buffer access functions were made static and
removed from the cross-module API.
All of the code in rangeenc.c and rangedec.c was merged into
entenc.c and entdec.c, respectively, as we are no longer
considering alternative backends.
rangeenc.c and rangede.c have been removed entirely.
This passes make check, after disabling the modes that we removed
support for in cf5d3a8c.
570 lines
18 KiB
C
570 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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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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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 FOUNDATION OR
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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 Q6 */
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static 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 Q6 and converted back to float */
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static const celt_word16 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 celt_word16 pred_coef[4] = {29440, 26112, 21248, 16384};
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static const celt_word16 beta_coef[4] = {30147, 22282, 12124, 6554};
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static const celt_word16 beta_intra = 4915;
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#else
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static const celt_word16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
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static const celt_word16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.};
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static const celt_word16 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 int intra_decision(const celt_word16 *eBands, celt_word16 *oldEBands, int start, int end, int len, int C)
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{
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int c, i;
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celt_word32 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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celt_word16 d = SHR16(SUB16(eBands[i+c*len], oldEBands[i+c*len]),2);
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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 SHR32(dist,2*DB_SHIFT-4) > 2*C*(end-start);
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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 celt_word16 *eBands, celt_word16 *oldEBands,
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ec_int32 budget, ec_int32 tell,
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const unsigned char *prob_model, celt_word16 *error, ec_enc *enc,
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int _C, int LM, int intra, celt_word16 max_decay)
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{
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const int C = CHANNELS(_C);
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int i, c;
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int badness = 0;
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celt_word32 prev[2] = {0,0};
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celt_word16 coef;
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celt_word16 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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celt_word32 q;
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celt_word16 x;
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celt_word32 f, tmp;
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celt_word16 oldE;
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celt_word16 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((celt_word32)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 (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 = 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 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 celt_word16 *eBands, celt_word16 *oldEBands, ec_uint32 budget,
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celt_word16 *error, ec_enc *enc, int _C, int LM, int nbAvailableBytes,
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int force_intra, int *delayedIntra, int two_pass)
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{
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const int C = CHANNELS(_C);
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int intra;
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celt_word16 max_decay;
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VARDECL(celt_word16, oldEBands_intra);
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VARDECL(celt_word16, error_intra);
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ec_enc enc_start_state;
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ec_uint32 tell;
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int badness1=0;
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SAVE_STACK;
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intra = force_intra || (*delayedIntra && nbAvailableBytes > end*C);
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if (/*shortBlocks || */intra_decision(eBands, oldEBands, start, effEnd, m->nbEBands, C))
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*delayedIntra = 1;
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else
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*delayedIntra = 0;
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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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/* Encode the global flags using a simple probability model
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(first symbols in the stream) */
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#ifdef FIXED_POINT
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max_decay = MIN32(QCONST16(16.f,DB_SHIFT), SHL32(EXTEND32(nbAvailableBytes),DB_SHIFT-3));
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#else
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max_decay = MIN32(16.f, .125f*nbAvailableBytes);
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#endif
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enc_start_state = *enc;
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ALLOC(oldEBands_intra, C*m->nbEBands, celt_word16);
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ALLOC(error_intra, C*m->nbEBands, celt_word16);
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CELT_COPY(oldEBands_intra, oldEBands, C*end);
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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);
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}
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if (!intra)
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{
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ec_enc enc_intra_state;
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int tell_intra;
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ec_uint32 nstart_bytes;
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ec_uint32 nintra_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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ALLOC(intra_bits, nintra_bytes-nstart_bytes, unsigned char);
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/* Copy bits from intra bit-stream */
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CELT_COPY(intra_bits,
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ec_get_buffer(&enc_intra_state) + nstart_bytes,
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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);
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if (two_pass && (badness1 < badness2 || (badness1 == badness2 && ec_tell_frac(enc) > 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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CELT_COPY(ec_get_buffer(&enc_intra_state) + nstart_bytes,
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intra_bits, nintra_bytes - nstart_bytes);
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CELT_COPY(oldEBands, oldEBands_intra, C*end);
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CELT_COPY(error, error_intra, C*end);
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}
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} else {
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CELT_COPY(oldEBands, oldEBands_intra, C*end);
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CELT_COPY(error, error_intra, C*end);
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}
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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, celt_word16 *oldEBands, celt_word16 *error, int *fine_quant, ec_enc *enc, int _C)
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{
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int i, c;
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const int C = CHANNELS(_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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celt_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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celt_word16 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, celt_word16 *oldEBands, celt_word16 *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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const int C = CHANNELS(_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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celt_word16 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, celt_word16 *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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celt_word32 prev[2] = {0, 0};
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celt_word16 coef;
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celt_word16 beta;
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const int C = CHANNELS(_C);
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ec_int32 budget;
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ec_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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celt_word32 q;
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celt_word32 tmp;
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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 = 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, celt_word16 *oldEBands, int *fine_quant, ec_dec *dec, int _C)
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{
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int i, c;
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const int C = CHANNELS(_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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celt_word16 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, celt_word16 *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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const int C = CHANNELS(_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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celt_word16 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 log2Amp(const CELTMode *m, int start, int end,
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celt_ener *eBands, celt_word16 *oldEBands, int _C)
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{
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int c, i;
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const int C = CHANNELS(_C);
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c=0;
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do {
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for (i=0;i<start;i++)
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eBands[i+c*m->nbEBands] = 0;
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for (;i<end;i++)
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{
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celt_word16 lg = ADD16(oldEBands[i+c*m->nbEBands],
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SHL16((celt_word16)eMeans[i],6));
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eBands[i+c*m->nbEBands] = PSHR32(celt_exp2(lg),4);
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}
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for (;i<m->nbEBands;i++)
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eBands[i+c*m->nbEBands] = 0;
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} while (++c < C);
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}
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void amp2Log2(const CELTMode *m, int effEnd, int end,
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celt_ener *bandE, celt_word16 *bandLogE, int _C)
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{
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int c, i;
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const int C = CHANNELS(_C);
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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((celt_word16)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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