cf5d3a8cf2
aa6fec66 added a check to reject modes with shorts longer than
3.33 ms (less than 300 per second).
However, it only rejected modes which could not be split at all.
This expands the check to also reject modes which, even after
splitting the maximum amount, still do not have shorts less than
3.33 ms.
465 lines
14 KiB
C
465 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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- 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 "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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static const celt_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.c"
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#else
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#include "static_modes_float.c"
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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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int celt_mode_info(const CELTMode *mode, int request, celt_int32 *value)
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{
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switch (request)
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{
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case CELT_GET_LOOKAHEAD:
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*value = mode->overlap;
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break;
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case CELT_GET_BITSTREAM_VERSION:
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*value = CELT_BITSTREAM_VERSION;
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break;
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case CELT_GET_SAMPLE_RATE:
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*value = mode->Fs;
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break;
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default:
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return CELT_UNIMPLEMENTED;
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}
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return CELT_OK;
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}
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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 celt_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 celt_int16 *compute_ebands(celt_int32 Fs, int frame_size, int res, int *nbEBands)
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{
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celt_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*(celt_int32)frame_size)
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{
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*nbEBands = sizeof(eband5ms)/sizeof(eband5ms[0])-1;
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eBands = celt_alloc(sizeof(celt_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 = celt_alloc(sizeof(celt_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 = celt_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*(celt_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*(celt_int32)eband5ms[k] > mode->eBands[j]*(celt_int32)mode->Fs/mode->shortMdctSize)
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break;
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}
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if (k>mode->nbEBands-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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celt_int32 a0, a1;
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a1 = mode->eBands[j]*(celt_int32)mode->Fs/mode->shortMdctSize - 400*(celt_int32)eband5ms[k-1];
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a0 = 400*(celt_int32)eband5ms[k] - mode->eBands[j]*(celt_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 *celt_mode_create(celt_int32 Fs, int frame_size, int *error)
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{
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int i;
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int res;
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CELTMode *mode=NULL;
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celt_word16 *window;
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celt_int16 *logN;
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int LM;
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#ifdef STDIN_TUNING
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scanf("%d ", &MIN_BINS);
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scanf("%d ", &BITALLOC_SIZE);
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band_allocation = celt_alloc(sizeof(int)*BARK_BANDS*BITALLOC_SIZE);
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for (i=0;i<BARK_BANDS*BITALLOC_SIZE;i++)
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{
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scanf("%d ", band_allocation+i);
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}
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#endif
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#ifdef CUSTOM_MODES
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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 = CELT_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 = CELT_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 = CELT_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 = CELT_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 ((celt_int32)frame_size*1000 < Fs)
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{
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if (error)
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*error = CELT_INVALID_MODE;
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return NULL;
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}
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if ((celt_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 ((celt_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 ((celt_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 ((celt_int32)(frame_size>>LM)*300 > Fs)
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{
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if (error)
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*error = CELT_INVALID_MODE;
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return NULL;
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}
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mode = celt_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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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 = (celt_word16*)celt_alloc(mode->overlap*sizeof(celt_word16));
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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 = (celt_int16*)celt_alloc(mode->nbEBands*sizeof(celt_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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clt_mdct_init(&mode->mdct, 2*mode->shortMdctSize*mode->nbShortMdcts, mode->maxLM);
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if ((mode->mdct.trig==NULL)
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#ifndef ENABLE_TI_DSPLIB55
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|| (mode->mdct.kfft==NULL)
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#endif
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)
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goto failure;
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if (error)
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*error = CELT_OK;
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return mode;
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failure:
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if (error)
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*error = CELT_INVALID_MODE;
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if (mode!=NULL)
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celt_mode_destroy(mode);
|
|
return NULL;
|
|
#endif /* !CUSTOM_MODES */
|
|
}
|
|
|
|
void celt_mode_destroy(CELTMode *mode)
|
|
{
|
|
#ifdef CUSTOM_MODES
|
|
int i;
|
|
if (mode == NULL)
|
|
return;
|
|
#ifndef CUSTOM_MODES_ONLY
|
|
for (i=0;i<TOTAL_MODES;i++)
|
|
{
|
|
if (mode == static_mode_list[i])
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
#endif /* CUSTOM_MODES_ONLY */
|
|
celt_free((celt_int16*)mode->eBands);
|
|
celt_free((celt_int16*)mode->allocVectors);
|
|
|
|
celt_free((celt_word16*)mode->window);
|
|
celt_free((celt_int16*)mode->logN);
|
|
|
|
celt_free((celt_int16*)mode->cache.index);
|
|
celt_free((unsigned char*)mode->cache.bits);
|
|
celt_free((unsigned char*)mode->cache.caps);
|
|
clt_mdct_clear(&mode->mdct);
|
|
|
|
celt_free((CELTMode *)mode);
|
|
#endif
|
|
}
|