ref: 6fd0270621a652484d06fa9d2a1a06721cd13400
dir: /libcelt/rate.c/
/* Copyright (c) 2007-2008 CSIRO
Copyright (c) 2007-2009 Xiph.Org Foundation
Written by Jean-Marc Valin */
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "modes.h"
#include "cwrs.h"
#include "arch.h"
#include "os_support.h"
#include "entcode.h"
#include "rate.h"
#ifndef STATIC_MODES
celt_int16 **compute_alloc_cache(CELTMode *m, int C)
{
int i, prevN;
int error = 0;
celt_int16 **bits;
const celt_int16 *eBands = m->eBands;
bits = celt_alloc(m->nbEBands*sizeof(celt_int16*));
if (bits==NULL)
return NULL;
prevN = -1;
for (i=0;i<m->nbEBands;i++)
{
int N = C*(eBands[i+1]-eBands[i]);
if (N == prevN && eBands[i] < m->pitchEnd)
{
bits[i] = bits[i-1];
} else {
bits[i] = celt_alloc(MAX_PSEUDO*sizeof(celt_int16));
if (bits[i]!=NULL) {
int j;
celt_int16 tmp[MAX_PULSES];
get_required_bits(tmp, N, MAX_PULSES, BITRES);
for (j=0;j<MAX_PSEUDO;j++)
bits[i][j] = tmp[get_pulses(j)];
} else {
error=1;
}
prevN = N;
}
}
if (error)
{
const celt_int16 *prevPtr = NULL;
if (bits!=NULL)
{
for (i=0;i<m->nbEBands;i++)
{
if (bits[i] != prevPtr)
{
prevPtr = bits[i];
celt_free((int*)bits[i]);
}
}
free(bits);
bits=NULL;
}
}
return bits;
}
#endif /* !STATIC_MODES */
static void interp_bits2pulses(const CELTMode *m, int *bits1, int *bits2, int total, int *bits, int *ebits, int *fine_priority, int len, int _C)
{
int psum;
int lo, hi;
int j;
const int C = CHANNELS(_C);
SAVE_STACK;
lo = 0;
hi = 1<<BITRES;
while (hi-lo != 1)
{
int mid = (lo+hi)>>1;
psum = 0;
for (j=0;j<len;j++)
psum += ((1<<BITRES)-mid)*bits1[j] + mid*bits2[j];
if (psum > (total<<BITRES))
hi = mid;
else
lo = mid;
}
psum = 0;
/*printf ("interp bisection gave %d\n", lo);*/
for (j=0;j<len;j++)
{
bits[j] = ((1<<BITRES)-lo)*bits1[j] + lo*bits2[j];
psum += bits[j];
}
/* Allocate the remaining bits */
{
int left, perband;
left = (total<<BITRES)-psum;
perband = left/len;
for (j=0;j<len;j++)
bits[j] += perband;
left = left-len*perband;
for (j=0;j<left;j++)
bits[j]++;
}
for (j=0;j<len;j++)
{
int N, d;
int offset;
N=m->eBands[j+1]-m->eBands[j];
/* Compensate for the extra DoF in stereo */
d=(C*N+ ((C==2 && N>2) ? 1 : 0))<<BITRES;
offset = FINE_OFFSET - log2_frac(N, BITRES);
/* Offset for the number of fine bits compared to their "fair share" of total/N */
offset = bits[j]-offset*N*C;
/* Compensate for the prediction gain in stereo */
if (C==2)
offset -= 1<<BITRES;
if (offset < 0)
offset = 0;
ebits[j] = (2*offset+d)/(2*d);
fine_priority[j] = ebits[j]*d >= offset;
/* Make sure not to bust */
if (C*ebits[j] > (bits[j]>>BITRES))
ebits[j] = bits[j]/C >> BITRES;
if (ebits[j]>7)
ebits[j]=7;
/* The bits used for fine allocation can't be used for pulses */
bits[j] -= C*ebits[j]<<BITRES;
if (bits[j] < 0)
bits[j] = 0;
}
RESTORE_STACK;
}
void compute_allocation(const CELTMode *m, int *offsets, int total, int *pulses, int *ebits, int *fine_priority, int _C)
{
int lo, hi, len, j;
const int C = CHANNELS(_C);
VARDECL(int, bits1);
VARDECL(int, bits2);
SAVE_STACK;
len = m->nbEBands;
ALLOC(bits1, len, int);
ALLOC(bits2, len, int);
lo = 0;
hi = m->nbAllocVectors - 1;
while (hi-lo != 1)
{
int psum = 0;
int mid = (lo+hi) >> 1;
for (j=0;j<len;j++)
{
bits1[j] = (C*m->allocVectors[mid*len+j] + offsets[j])<<BITRES;
if (bits1[j] < 0)
bits1[j] = 0;
psum += bits1[j];
/*printf ("%d ", bits[j]);*/
}
/*printf ("\n");*/
if (psum > (total<<BITRES))
hi = mid;
else
lo = mid;
/*printf ("lo = %d, hi = %d\n", lo, hi);*/
}
/*printf ("interp between %d and %d\n", lo, hi);*/
for (j=0;j<len;j++)
{
bits1[j] = C*m->allocVectors[lo*len+j] + offsets[j];
bits2[j] = C*m->allocVectors[hi*len+j] + offsets[j];
if (bits1[j] < 0)
bits1[j] = 0;
if (bits2[j] < 0)
bits2[j] = 0;
}
interp_bits2pulses(m, bits1, bits2, total, pulses, ebits, fine_priority, len, C);
RESTORE_STACK;
}