443 lines
14 KiB
C
443 lines
14 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Copyright (c) 2008 Gregory Maxwell
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Written by Jean-Marc Valin and Gregory Maxwell */
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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 "celt.h"
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#include "modes.h"
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#include "rate.h"
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#include "os_support.h"
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#include "stack_alloc.h"
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#include "quant_bands.h"
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#include "cpu_support.h"
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static const opus_int16 eband5ms[] = {
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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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0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100
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};
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/* Alternate tuning (partially derived from Vorbis) */
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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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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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90, 80, 75, 69, 63, 56, 49, 40, 34, 29, 20, 18, 10, 0, 0, 0, 0, 0, 0, 0, 0,
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110,100, 90, 84, 78, 71, 65, 58, 51, 45, 39, 32, 26, 20, 12, 0, 0, 0, 0, 0, 0,
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118,110,103, 93, 86, 80, 75, 70, 65, 59, 53, 47, 40, 31, 23, 15, 4, 0, 0, 0, 0,
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126,119,112,104, 95, 89, 83, 78, 72, 66, 60, 54, 47, 39, 32, 25, 17, 12, 1, 0, 0,
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134,127,120,114,103, 97, 91, 85, 78, 72, 66, 60, 54, 47, 41, 35, 29, 23, 16, 10, 1,
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144,137,130,124,113,107,101, 95, 88, 82, 76, 70, 64, 57, 51, 45, 39, 33, 26, 15, 1,
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152,145,138,132,123,117,111,105, 98, 92, 86, 80, 74, 67, 61, 55, 49, 43, 36, 20, 1,
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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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};
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#ifndef CUSTOM_MODES_ONLY
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#ifdef FIXED_POINT
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#include "static_modes_fixed.h"
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#else
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#include "static_modes_float.h"
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#endif
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#endif /* CUSTOM_MODES_ONLY */
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#ifndef M_PI
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#define M_PI 3.141592653
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#endif
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#ifdef CUSTOM_MODES
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/* Defining 25 critical bands for the full 0-20 kHz audio bandwidth
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Taken from http://ccrma.stanford.edu/~jos/bbt/Bark_Frequency_Scale.html */
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#define BARK_BANDS 25
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static const opus_int16 bark_freq[BARK_BANDS+1] = {
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0, 100, 200, 300, 400,
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510, 630, 770, 920, 1080,
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1270, 1480, 1720, 2000, 2320,
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2700, 3150, 3700, 4400, 5300,
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6400, 7700, 9500, 12000, 15500,
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20000};
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static opus_int16 *compute_ebands(opus_int32 Fs, int frame_size, int res, int *nbEBands)
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{
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opus_int16 *eBands;
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int i, j, lin, low, high, nBark, offset=0;
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/* All modes that have 2.5 ms short blocks use the same definition */
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if (Fs == 400*(opus_int32)frame_size)
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{
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*nbEBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
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eBands = opus_alloc(sizeof(opus_int16)*(*nbEBands+1));
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for (i=0;i<*nbEBands+1;i++)
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eBands[i] = eband5ms[i];
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return eBands;
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}
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/* Find the number of critical bands supported by our sampling rate */
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for (nBark=1;nBark<BARK_BANDS;nBark++)
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if (bark_freq[nBark+1]*2 >= Fs)
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break;
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/* Find where the linear part ends (i.e. where the spacing is more than min_width */
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for (lin=0;lin<nBark;lin++)
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if (bark_freq[lin+1]-bark_freq[lin] >= res)
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break;
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low = (bark_freq[lin]+res/2)/res;
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high = nBark-lin;
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*nbEBands = low+high;
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eBands = opus_alloc(sizeof(opus_int16)*(*nbEBands+2));
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if (eBands==NULL)
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return NULL;
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/* Linear spacing (min_width) */
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for (i=0;i<low;i++)
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eBands[i] = i;
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if (low>0)
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offset = eBands[low-1]*res - bark_freq[lin-1];
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/* Spacing follows critical bands */
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for (i=0;i<high;i++)
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{
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int target = bark_freq[lin+i];
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/* Round to an even value */
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eBands[i+low] = (target+offset/2+res)/(2*res)*2;
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offset = eBands[i+low]*res - target;
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}
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/* Enforce the minimum spacing at the boundary */
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for (i=0;i<*nbEBands;i++)
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if (eBands[i] < i)
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eBands[i] = i;
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/* Round to an even value */
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eBands[*nbEBands] = (bark_freq[nBark]+res)/(2*res)*2;
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if (eBands[*nbEBands] > frame_size)
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eBands[*nbEBands] = frame_size;
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for (i=1;i<*nbEBands-1;i++)
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{
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if (eBands[i+1]-eBands[i] < eBands[i]-eBands[i-1])
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{
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eBands[i] -= (2*eBands[i]-eBands[i-1]-eBands[i+1])/2;
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}
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}
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/* Remove any empty bands. */
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for (i=j=0;i<*nbEBands;i++)
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if(eBands[i+1]>eBands[j])
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eBands[++j]=eBands[i+1];
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*nbEBands=j;
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for (i=1;i<*nbEBands;i++)
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{
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/* Every band must be smaller than the last band. */
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celt_assert(eBands[i]-eBands[i-1]<=eBands[*nbEBands]-eBands[*nbEBands-1]);
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/* Each band must be no larger than twice the size of the previous one. */
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celt_assert(eBands[i+1]-eBands[i]<=2*(eBands[i]-eBands[i-1]));
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}
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return eBands;
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}
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static void compute_allocation_table(CELTMode *mode)
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{
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int i, j;
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unsigned char *allocVectors;
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int maxBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
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mode->nbAllocVectors = BITALLOC_SIZE;
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allocVectors = opus_alloc(sizeof(unsigned char)*(BITALLOC_SIZE*mode->nbEBands));
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if (allocVectors==NULL)
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return;
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/* Check for standard mode */
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if (mode->Fs == 400*(opus_int32)mode->shortMdctSize)
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{
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for (i=0;i<BITALLOC_SIZE*mode->nbEBands;i++)
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allocVectors[i] = band_allocation[i];
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mode->allocVectors = allocVectors;
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return;
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}
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/* If not the standard mode, interpolate */
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/* Compute per-codec-band allocation from per-critical-band matrix */
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for (i=0;i<BITALLOC_SIZE;i++)
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{
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for (j=0;j<mode->nbEBands;j++)
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{
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int k;
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for (k=0;k<maxBands;k++)
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{
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if (400*(opus_int32)eband5ms[k] > mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize)
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break;
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}
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if (k>maxBands-1)
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allocVectors[i*mode->nbEBands+j] = band_allocation[i*maxBands + maxBands-1];
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else {
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opus_int32 a0, a1;
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a1 = mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize - 400*(opus_int32)eband5ms[k-1];
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a0 = 400*(opus_int32)eband5ms[k] - mode->eBands[j]*(opus_int32)mode->Fs/mode->shortMdctSize;
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allocVectors[i*mode->nbEBands+j] = (a0*band_allocation[i*maxBands+k-1]
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+ a1*band_allocation[i*maxBands+k])/(a0+a1);
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}
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}
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}
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/*printf ("\n");
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for (i=0;i<BITALLOC_SIZE;i++)
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{
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for (j=0;j<mode->nbEBands;j++)
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printf ("%d ", allocVectors[i*mode->nbEBands+j]);
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printf ("\n");
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}
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exit(0);*/
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mode->allocVectors = allocVectors;
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}
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#endif /* CUSTOM_MODES */
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CELTMode *opus_custom_mode_create(opus_int32 Fs, int frame_size, int *error)
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{
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int i;
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#ifdef CUSTOM_MODES
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CELTMode *mode=NULL;
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int res;
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opus_val16 *window;
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opus_int16 *logN;
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int LM;
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int arch = opus_select_arch();
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ALLOC_STACK;
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#if !defined(VAR_ARRAYS) && !defined(USE_ALLOCA)
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if (global_stack==NULL)
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goto failure;
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#endif
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#endif
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#ifndef CUSTOM_MODES_ONLY
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for (i=0;i<TOTAL_MODES;i++)
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{
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int j;
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for (j=0;j<4;j++)
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{
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if (Fs == static_mode_list[i]->Fs &&
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(frame_size<<j) == static_mode_list[i]->shortMdctSize*static_mode_list[i]->nbShortMdcts)
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{
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if (error)
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*error = OPUS_OK;
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return (CELTMode*)static_mode_list[i];
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}
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}
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}
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#endif /* CUSTOM_MODES_ONLY */
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#ifndef CUSTOM_MODES
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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#else
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/* The good thing here is that permutation of the arguments will automatically be invalid */
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if (Fs < 8000 || Fs > 96000)
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{
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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}
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if (frame_size < 40 || frame_size > 1024 || frame_size%2!=0)
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{
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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}
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/* Frames of less than 1ms are not supported. */
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if ((opus_int32)frame_size*1000 < Fs)
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{
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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}
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if ((opus_int32)frame_size*75 >= Fs && (frame_size%16)==0)
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{
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LM = 3;
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} else if ((opus_int32)frame_size*150 >= Fs && (frame_size%8)==0)
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{
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LM = 2;
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} else if ((opus_int32)frame_size*300 >= Fs && (frame_size%4)==0)
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{
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LM = 1;
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} else
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{
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LM = 0;
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}
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/* Shorts longer than 3.3ms are not supported. */
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if ((opus_int32)(frame_size>>LM)*300 > Fs)
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{
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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}
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mode = opus_alloc(sizeof(CELTMode));
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if (mode==NULL)
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goto failure;
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mode->Fs = Fs;
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/* Pre/de-emphasis depends on sampling rate. The "standard" pre-emphasis
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is defined as A(z) = 1 - 0.85*z^-1 at 48 kHz. Other rates should
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approximate that. */
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if(Fs < 12000) /* 8 kHz */
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{
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mode->preemph[0] = QCONST16(0.3500061035f, 15);
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mode->preemph[1] = -QCONST16(0.1799926758f, 15);
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mode->preemph[2] = QCONST16(0.2719968125f, SIG_SHIFT); /* exact 1/preemph[3] */
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mode->preemph[3] = QCONST16(3.6765136719f, 13);
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} else if(Fs < 24000) /* 16 kHz */
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{
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mode->preemph[0] = QCONST16(0.6000061035f, 15);
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mode->preemph[1] = -QCONST16(0.1799926758f, 15);
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mode->preemph[2] = QCONST16(0.4424998650f, SIG_SHIFT); /* exact 1/preemph[3] */
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mode->preemph[3] = QCONST16(2.2598876953f, 13);
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} else if(Fs < 40000) /* 32 kHz */
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{
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mode->preemph[0] = QCONST16(0.7799987793f, 15);
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mode->preemph[1] = -QCONST16(0.1000061035f, 15);
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mode->preemph[2] = QCONST16(0.7499771125f, SIG_SHIFT); /* exact 1/preemph[3] */
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mode->preemph[3] = QCONST16(1.3333740234f, 13);
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} else /* 48 kHz */
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{
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mode->preemph[0] = QCONST16(0.8500061035f, 15);
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mode->preemph[1] = QCONST16(0.0f, 15);
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mode->preemph[2] = QCONST16(1.f, SIG_SHIFT);
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mode->preemph[3] = QCONST16(1.f, 13);
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}
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mode->maxLM = LM;
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mode->nbShortMdcts = 1<<LM;
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mode->shortMdctSize = frame_size/mode->nbShortMdcts;
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res = (mode->Fs+mode->shortMdctSize)/(2*mode->shortMdctSize);
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mode->eBands = compute_ebands(Fs, mode->shortMdctSize, res, &mode->nbEBands);
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if (mode->eBands==NULL)
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goto failure;
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#if !defined(SMALL_FOOTPRINT)
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/* Make sure we don't allocate a band larger than our PVQ table.
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208 should be enough, but let's be paranoid. */
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if ((mode->eBands[mode->nbEBands] - mode->eBands[mode->nbEBands-1])<<LM >
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208) {
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goto failure;
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}
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#endif
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mode->effEBands = mode->nbEBands;
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while (mode->eBands[mode->effEBands] > mode->shortMdctSize)
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mode->effEBands--;
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/* Overlap must be divisible by 4 */
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mode->overlap = ((mode->shortMdctSize>>2)<<2);
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compute_allocation_table(mode);
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if (mode->allocVectors==NULL)
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goto failure;
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window = (opus_val16*)opus_alloc(mode->overlap*sizeof(opus_val16));
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if (window==NULL)
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goto failure;
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#ifndef FIXED_POINT
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for (i=0;i<mode->overlap;i++)
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window[i] = Q15ONE*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap));
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#else
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for (i=0;i<mode->overlap;i++)
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window[i] = MIN32(32767,floor(.5+32768.*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap))));
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#endif
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mode->window = window;
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logN = (opus_int16*)opus_alloc(mode->nbEBands*sizeof(opus_int16));
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if (logN==NULL)
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goto failure;
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for (i=0;i<mode->nbEBands;i++)
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logN[i] = log2_frac(mode->eBands[i+1]-mode->eBands[i], BITRES);
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mode->logN = logN;
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compute_pulse_cache(mode, mode->maxLM);
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if (clt_mdct_init(&mode->mdct, 2*mode->shortMdctSize*mode->nbShortMdcts,
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mode->maxLM, arch) == 0)
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goto failure;
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if (error)
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*error = OPUS_OK;
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return mode;
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failure:
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if (error)
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*error = OPUS_ALLOC_FAIL;
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if (mode!=NULL)
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opus_custom_mode_destroy(mode);
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return NULL;
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#endif /* !CUSTOM_MODES */
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}
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#ifdef CUSTOM_MODES
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void opus_custom_mode_destroy(CELTMode *mode)
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{
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int arch = opus_select_arch();
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if (mode == NULL)
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return;
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#ifndef CUSTOM_MODES_ONLY
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{
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int i;
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for (i=0;i<TOTAL_MODES;i++)
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{
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if (mode == static_mode_list[i])
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{
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return;
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}
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}
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}
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#endif /* CUSTOM_MODES_ONLY */
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opus_free((opus_int16*)mode->eBands);
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opus_free((opus_int16*)mode->allocVectors);
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opus_free((opus_val16*)mode->window);
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opus_free((opus_int16*)mode->logN);
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opus_free((opus_int16*)mode->cache.index);
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opus_free((unsigned char*)mode->cache.bits);
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opus_free((unsigned char*)mode->cache.caps);
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clt_mdct_clear(&mode->mdct, arch);
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opus_free((CELTMode *)mode);
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}
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|
#endif
|