1284 lines
38 KiB
C
1284 lines
38 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Copyright (c) 2008-2009 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 <math.h>
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#include "bands.h"
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#include "modes.h"
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#include "vq.h"
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#include "cwrs.h"
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#include "stack_alloc.h"
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#include "os_support.h"
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#include "mathops.h"
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#include "rate.h"
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celt_uint32 lcg_rand(celt_uint32 seed)
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{
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return 1664525 * seed + 1013904223;
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}
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/* This is a cos() approximation designed to be bit-exact on any platform. Bit exactness
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with this approximation is important because it has an impact on the bit allocation */
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static celt_int16 bitexact_cos(celt_int16 x)
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{
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celt_int32 tmp;
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celt_int16 x2;
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tmp = (4096+((celt_int32)(x)*(x)))>>13;
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if (tmp > 32767)
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tmp = 32767;
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x2 = tmp;
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x2 = (32767-x2) + FRAC_MUL16(x2, (-7651 + FRAC_MUL16(x2, (8277 + FRAC_MUL16(-626, x2)))));
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if (x2 > 32766)
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x2 = 32766;
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return 1+x2;
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}
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static int bitexact_log2tan(int isin,int icos)
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{
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int lc;
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int ls;
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lc=EC_ILOG(icos);
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ls=EC_ILOG(isin);
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icos<<=15-lc;
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isin<<=15-ls;
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return ((ls-lc)<<11)
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+FRAC_MUL16(isin, FRAC_MUL16(isin, -2597) + 7932)
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-FRAC_MUL16(icos, FRAC_MUL16(icos, -2597) + 7932);
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}
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#ifdef FIXED_POINT
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/* Compute the amplitude (sqrt energy) in each of the bands */
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void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank, int end, int _C, int M)
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{
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int i, c, N;
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const celt_int16 *eBands = m->eBands;
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const int C = CHANNELS(_C);
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N = M*m->shortMdctSize;
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c=0; do {
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for (i=0;i<end;i++)
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{
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int j;
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celt_word32 maxval=0;
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celt_word32 sum = 0;
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j=M*eBands[i]; do {
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maxval = MAX32(maxval, X[j+c*N]);
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maxval = MAX32(maxval, -X[j+c*N]);
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} while (++j<M*eBands[i+1]);
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if (maxval > 0)
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{
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int shift = celt_ilog2(maxval)-10;
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j=M*eBands[i]; do {
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sum = MAC16_16(sum, EXTRACT16(VSHR32(X[j+c*N],shift)),
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EXTRACT16(VSHR32(X[j+c*N],shift)));
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} while (++j<M*eBands[i+1]);
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/* We're adding one here to make damn sure we never end up with a pitch vector that's
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larger than unity norm */
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bank[i+c*m->nbEBands] = EPSILON+VSHR32(EXTEND32(celt_sqrt(sum)),-shift);
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} else {
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bank[i+c*m->nbEBands] = EPSILON;
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}
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/*printf ("%f ", bank[i+c*m->nbEBands]);*/
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}
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} while (++c<C);
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/*printf ("\n");*/
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}
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/* Normalise each band such that the energy is one. */
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void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_norm * restrict X, const celt_ener *bank, int end, int _C, int M)
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{
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int i, c, N;
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const celt_int16 *eBands = m->eBands;
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const int C = CHANNELS(_C);
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N = M*m->shortMdctSize;
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c=0; do {
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i=0; do {
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celt_word16 g;
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int j,shift;
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celt_word16 E;
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shift = celt_zlog2(bank[i+c*m->nbEBands])-13;
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E = VSHR32(bank[i+c*m->nbEBands], shift);
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g = EXTRACT16(celt_rcp(SHL32(E,3)));
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j=M*eBands[i]; do {
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X[j+c*N] = MULT16_16_Q15(VSHR32(freq[j+c*N],shift-1),g);
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} while (++j<M*eBands[i+1]);
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} while (++i<end);
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} while (++c<C);
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}
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#else /* FIXED_POINT */
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/* Compute the amplitude (sqrt energy) in each of the bands */
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void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bank, int end, int _C, int M)
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{
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int i, c, N;
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const celt_int16 *eBands = m->eBands;
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const int C = CHANNELS(_C);
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N = M*m->shortMdctSize;
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c=0; do {
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for (i=0;i<end;i++)
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{
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int j;
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celt_word32 sum = 1e-27f;
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for (j=M*eBands[i];j<M*eBands[i+1];j++)
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sum += X[j+c*N]*X[j+c*N];
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bank[i+c*m->nbEBands] = celt_sqrt(sum);
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/*printf ("%f ", bank[i+c*m->nbEBands]);*/
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}
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} while (++c<C);
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/*printf ("\n");*/
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}
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/* Normalise each band such that the energy is one. */
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void normalise_bands(const CELTMode *m, const celt_sig * restrict freq, celt_norm * restrict X, const celt_ener *bank, int end, int _C, int M)
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{
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int i, c, N;
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const celt_int16 *eBands = m->eBands;
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const int C = CHANNELS(_C);
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N = M*m->shortMdctSize;
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c=0; do {
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for (i=0;i<end;i++)
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{
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int j;
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celt_word16 g = 1.f/(1e-27f+bank[i+c*m->nbEBands]);
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for (j=M*eBands[i];j<M*eBands[i+1];j++)
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X[j+c*N] = freq[j+c*N]*g;
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}
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} while (++c<C);
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}
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#endif /* FIXED_POINT */
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/* De-normalise the energy to produce the synthesis from the unit-energy bands */
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void denormalise_bands(const CELTMode *m, const celt_norm * restrict X, celt_sig * restrict freq, const celt_ener *bank, int end, int _C, int M)
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{
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int i, c, N;
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const celt_int16 *eBands = m->eBands;
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const int C = CHANNELS(_C);
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N = M*m->shortMdctSize;
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celt_assert2(C<=2, "denormalise_bands() not implemented for >2 channels");
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c=0; do {
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celt_sig * restrict f;
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const celt_norm * restrict x;
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f = freq+c*N;
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x = X+c*N;
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for (i=0;i<end;i++)
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{
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int j, band_end;
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celt_word32 g = SHR32(bank[i+c*m->nbEBands],1);
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j=M*eBands[i];
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band_end = M*eBands[i+1];
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do {
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*f++ = SHL32(MULT16_32_Q15(*x, g),2);
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x++;
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} while (++j<band_end);
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}
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for (i=M*eBands[m->nbEBands];i<N;i++)
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*f++ = 0;
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} while (++c<C);
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}
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/* This prevents energy collapse for transients with multiple short MDCTs */
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void anti_collapse(const CELTMode *m, celt_norm *_X, unsigned char *collapse_masks, int LM, int C, int CC, int size,
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int start, int end, celt_word16 *logE, celt_word16 *prev1logE,
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celt_word16 *prev2logE, int *pulses, celt_uint32 seed)
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{
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int c, i, j, k;
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for (i=start;i<end;i++)
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{
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int N0;
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celt_word16 thresh, sqrt_1;
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int depth;
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#ifdef FIXED_POINT
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int shift;
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#endif
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N0 = m->eBands[i+1]-m->eBands[i];
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/* depth in 1/8 bits */
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depth = (1+pulses[i])/((m->eBands[i+1]-m->eBands[i])<<LM);
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#ifdef FIXED_POINT
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thresh = MULT16_32_Q15(QCONST16(0.5f, 15), MIN32(32767,SHR32(celt_exp2(-SHL16(depth, 10-BITRES)),1) ));
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{
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celt_word32 t;
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t = N0<<LM;
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shift = celt_ilog2(t)>>1;
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t = SHL32(t, (7-shift)<<1);
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sqrt_1 = celt_rsqrt_norm(t);
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}
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#else
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thresh = .5f*celt_exp2(-.125f*depth);
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sqrt_1 = celt_rsqrt(N0<<LM);
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#endif
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c=0; do
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{
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celt_norm *X;
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celt_word16 prev1;
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celt_word16 prev2;
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celt_word16 Ediff;
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celt_word16 r;
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int renormalize=0;
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prev1 = prev1logE[c*m->nbEBands+i];
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prev2 = prev2logE[c*m->nbEBands+i];
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if (C<CC)
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{
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prev1 = MAX16(prev1,prev1logE[m->nbEBands+i]);
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prev2 = MAX16(prev2,prev2logE[m->nbEBands+i]);
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}
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Ediff = logE[c*m->nbEBands+i]-MIN16(prev1,prev2);
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Ediff = MAX16(0, Ediff);
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#ifdef FIXED_POINT
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if (Ediff < 16384)
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r = 2*MIN16(16383,SHR32(celt_exp2(-Ediff),1));
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else
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r = 0;
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if (LM==3)
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r = MULT16_16_Q14(23170, MIN32(23169, r));
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r = SHR16(MIN16(thresh, r),1);
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r = SHR32(MULT16_16_Q15(sqrt_1, r),shift);
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#else
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/* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
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short blocks don't have the same energy as long */
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r = 2.f*celt_exp2(-Ediff);
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if (LM==3)
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r *= 1.41421356f;
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r = MIN16(thresh, r);
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r = r*sqrt_1;
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#endif
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X = _X+c*size+(m->eBands[i]<<LM);
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for (k=0;k<1<<LM;k++)
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{
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/* Detect collapse */
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if (!(collapse_masks[i*C+c]&1<<k))
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{
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/* Fill with noise */
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for (j=0;j<N0;j++)
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{
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seed = lcg_rand(seed);
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X[(j<<LM)+k] = (seed&0x8000 ? r : -r);
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}
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renormalize = 1;
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}
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}
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/* We just added some energy, so we need to renormalise */
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if (renormalize)
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renormalise_vector(X, N0<<LM, Q15ONE);
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} while (++c<C);
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}
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}
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static void intensity_stereo(const CELTMode *m, celt_norm *X, celt_norm *Y, const celt_ener *bank, int bandID, int N)
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{
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int i = bandID;
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int j;
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celt_word16 a1, a2;
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celt_word16 left, right;
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celt_word16 norm;
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#ifdef FIXED_POINT
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int shift = celt_zlog2(MAX32(bank[i], bank[i+m->nbEBands]))-13;
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#endif
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left = VSHR32(bank[i],shift);
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right = VSHR32(bank[i+m->nbEBands],shift);
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norm = EPSILON + celt_sqrt(EPSILON+MULT16_16(left,left)+MULT16_16(right,right));
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a1 = DIV32_16(SHL32(EXTEND32(left),14),norm);
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a2 = DIV32_16(SHL32(EXTEND32(right),14),norm);
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for (j=0;j<N;j++)
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{
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celt_norm r, l;
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l = X[j];
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r = Y[j];
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X[j] = MULT16_16_Q14(a1,l) + MULT16_16_Q14(a2,r);
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/* Side is not encoded, no need to calculate */
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}
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}
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static void stereo_split(celt_norm *X, celt_norm *Y, int N)
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{
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int j;
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for (j=0;j<N;j++)
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{
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celt_norm r, l;
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l = MULT16_16_Q15(QCONST16(.70710678f,15), X[j]);
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r = MULT16_16_Q15(QCONST16(.70710678f,15), Y[j]);
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X[j] = l+r;
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Y[j] = r-l;
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}
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}
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static void stereo_merge(celt_norm *X, celt_norm *Y, celt_word16 mid, int N)
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{
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int j;
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celt_word32 xp=0, side=0;
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celt_word32 El, Er;
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celt_word16 mid2;
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#ifdef FIXED_POINT
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int kl, kr;
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#endif
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celt_word32 t, lgain, rgain;
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/* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */
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for (j=0;j<N;j++)
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{
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xp = MAC16_16(xp, X[j], Y[j]);
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side = MAC16_16(side, Y[j], Y[j]);
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}
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/* Compensating for the mid normalization */
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xp = MULT16_32_Q15(mid, xp);
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/* mid and side are in Q15, not Q14 like X and Y */
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mid2 = SHR32(mid, 1);
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El = MULT16_16(mid2, mid2) + side - 2*xp;
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Er = MULT16_16(mid2, mid2) + side + 2*xp;
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if (Er < QCONST32(6e-4f, 28) || El < QCONST32(6e-4f, 28))
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{
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for (j=0;j<N;j++)
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Y[j] = X[j];
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return;
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}
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#ifdef FIXED_POINT
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kl = celt_ilog2(El)>>1;
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kr = celt_ilog2(Er)>>1;
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#endif
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t = VSHR32(El, (kl-7)<<1);
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lgain = celt_rsqrt_norm(t);
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t = VSHR32(Er, (kr-7)<<1);
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rgain = celt_rsqrt_norm(t);
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#ifdef FIXED_POINT
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if (kl < 7)
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kl = 7;
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if (kr < 7)
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kr = 7;
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#endif
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for (j=0;j<N;j++)
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{
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celt_norm r, l;
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/* Apply mid scaling (side is already scaled) */
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l = MULT16_16_Q15(mid, X[j]);
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r = Y[j];
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X[j] = EXTRACT16(PSHR32(MULT16_16(lgain, SUB16(l,r)), kl+1));
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Y[j] = EXTRACT16(PSHR32(MULT16_16(rgain, ADD16(l,r)), kr+1));
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}
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}
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/* Decide whether we should spread the pulses in the current frame */
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int spreading_decision(const CELTMode *m, celt_norm *X, int *average,
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int last_decision, int *hf_average, int *tapset_decision, int update_hf,
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int end, int _C, int M)
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{
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int i, c, N0;
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int sum = 0, nbBands=0;
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const int C = CHANNELS(_C);
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const celt_int16 * restrict eBands = m->eBands;
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int decision;
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int hf_sum=0;
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N0 = M*m->shortMdctSize;
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if (M*(eBands[end]-eBands[end-1]) <= 8)
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return SPREAD_NONE;
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c=0; do {
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for (i=0;i<end;i++)
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{
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int j, N, tmp=0;
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int tcount[3] = {0};
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celt_norm * restrict x = X+M*eBands[i]+c*N0;
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N = M*(eBands[i+1]-eBands[i]);
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if (N<=8)
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continue;
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/* Compute rough CDF of |x[j]| */
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for (j=0;j<N;j++)
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{
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celt_word32 x2N; /* Q13 */
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x2N = MULT16_16(MULT16_16_Q15(x[j], x[j]), N);
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if (x2N < QCONST16(0.25f,13))
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tcount[0]++;
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if (x2N < QCONST16(0.0625f,13))
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tcount[1]++;
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if (x2N < QCONST16(0.015625f,13))
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tcount[2]++;
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}
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/* Only include four last bands (8 kHz and up) */
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if (i>m->nbEBands-4)
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hf_sum += 32*(tcount[1]+tcount[0])/N;
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tmp = (2*tcount[2] >= N) + (2*tcount[1] >= N) + (2*tcount[0] >= N);
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sum += tmp*256;
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nbBands++;
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}
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|
} while (++c<C);
|
|
|
|
if (update_hf)
|
|
{
|
|
if (hf_sum)
|
|
hf_sum /= C*(4-m->nbEBands+end);
|
|
*hf_average = (*hf_average+hf_sum)>>1;
|
|
hf_sum = *hf_average;
|
|
if (*tapset_decision==2)
|
|
hf_sum += 4;
|
|
else if (*tapset_decision==0)
|
|
hf_sum -= 4;
|
|
if (hf_sum > 22)
|
|
*tapset_decision=2;
|
|
else if (hf_sum > 18)
|
|
*tapset_decision=1;
|
|
else
|
|
*tapset_decision=0;
|
|
}
|
|
/*printf("%d %d %d\n", hf_sum, *hf_average, *tapset_decision);*/
|
|
sum /= nbBands;
|
|
/* Recursive averaging */
|
|
sum = (sum+*average)>>1;
|
|
*average = sum;
|
|
/* Hysteresis */
|
|
sum = (3*sum + (((3-last_decision)<<7) + 64) + 2)>>2;
|
|
if (sum < 80)
|
|
{
|
|
decision = SPREAD_AGGRESSIVE;
|
|
} else if (sum < 256)
|
|
{
|
|
decision = SPREAD_NORMAL;
|
|
} else if (sum < 384)
|
|
{
|
|
decision = SPREAD_LIGHT;
|
|
} else {
|
|
decision = SPREAD_NONE;
|
|
}
|
|
return decision;
|
|
}
|
|
|
|
#ifdef MEASURE_NORM_MSE
|
|
|
|
float MSE[30] = {0};
|
|
int nbMSEBands = 0;
|
|
int MSECount[30] = {0};
|
|
|
|
void dump_norm_mse(void)
|
|
{
|
|
int i;
|
|
for (i=0;i<nbMSEBands;i++)
|
|
{
|
|
printf ("%g ", MSE[i]/MSECount[i]);
|
|
}
|
|
printf ("\n");
|
|
}
|
|
|
|
void measure_norm_mse(const CELTMode *m, float *X, float *X0, float *bandE, float *bandE0, int M, int N, int C)
|
|
{
|
|
static int init = 0;
|
|
int i;
|
|
if (!init)
|
|
{
|
|
atexit(dump_norm_mse);
|
|
init = 1;
|
|
}
|
|
for (i=0;i<m->nbEBands;i++)
|
|
{
|
|
int j;
|
|
int c;
|
|
float g;
|
|
if (bandE0[i]<10 || (C==2 && bandE0[i+m->nbEBands]<1))
|
|
continue;
|
|
c=0; do {
|
|
g = bandE[i+c*m->nbEBands]/(1e-15+bandE0[i+c*m->nbEBands]);
|
|
for (j=M*m->eBands[i];j<M*m->eBands[i+1];j++)
|
|
MSE[i] += (g*X[j+c*N]-X0[j+c*N])*(g*X[j+c*N]-X0[j+c*N]);
|
|
} while (++c<C);
|
|
MSECount[i]+=C;
|
|
}
|
|
nbMSEBands = m->nbEBands;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* Indexing table for converting from natural Hadamard to ordery Hadamard
|
|
This is essentially a bit-reversed Gray, on top of which we've added
|
|
an inversion of the order because we want the DC at the end rather than
|
|
the beginning. The lines are for N=2, 4, 8, 16 */
|
|
static const int ordery_table[] = {
|
|
1, 0,
|
|
3, 0, 2, 1,
|
|
7, 0, 4, 3, 6, 1, 5, 2,
|
|
15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5,
|
|
};
|
|
|
|
static void deinterleave_hadamard(celt_norm *X, int N0, int stride, int hadamard)
|
|
{
|
|
int i,j;
|
|
VARDECL(celt_norm, tmp);
|
|
int N;
|
|
SAVE_STACK;
|
|
N = N0*stride;
|
|
ALLOC(tmp, N, celt_norm);
|
|
if (hadamard)
|
|
{
|
|
const int *ordery = ordery_table+stride-2;
|
|
for (i=0;i<stride;i++)
|
|
{
|
|
for (j=0;j<N0;j++)
|
|
tmp[ordery[i]*N0+j] = X[j*stride+i];
|
|
}
|
|
} else {
|
|
for (i=0;i<stride;i++)
|
|
for (j=0;j<N0;j++)
|
|
tmp[i*N0+j] = X[j*stride+i];
|
|
}
|
|
for (j=0;j<N;j++)
|
|
X[j] = tmp[j];
|
|
RESTORE_STACK;
|
|
}
|
|
|
|
static void interleave_hadamard(celt_norm *X, int N0, int stride, int hadamard)
|
|
{
|
|
int i,j;
|
|
VARDECL(celt_norm, tmp);
|
|
int N;
|
|
SAVE_STACK;
|
|
N = N0*stride;
|
|
ALLOC(tmp, N, celt_norm);
|
|
if (hadamard)
|
|
{
|
|
const int *ordery = ordery_table+stride-2;
|
|
for (i=0;i<stride;i++)
|
|
for (j=0;j<N0;j++)
|
|
tmp[j*stride+i] = X[ordery[i]*N0+j];
|
|
} else {
|
|
for (i=0;i<stride;i++)
|
|
for (j=0;j<N0;j++)
|
|
tmp[j*stride+i] = X[i*N0+j];
|
|
}
|
|
for (j=0;j<N;j++)
|
|
X[j] = tmp[j];
|
|
RESTORE_STACK;
|
|
}
|
|
|
|
void haar1(celt_norm *X, int N0, int stride)
|
|
{
|
|
int i, j;
|
|
N0 >>= 1;
|
|
for (i=0;i<stride;i++)
|
|
for (j=0;j<N0;j++)
|
|
{
|
|
celt_norm tmp1, tmp2;
|
|
tmp1 = MULT16_16_Q15(QCONST16(.70710678f,15), X[stride*2*j+i]);
|
|
tmp2 = MULT16_16_Q15(QCONST16(.70710678f,15), X[stride*(2*j+1)+i]);
|
|
X[stride*2*j+i] = tmp1 + tmp2;
|
|
X[stride*(2*j+1)+i] = tmp1 - tmp2;
|
|
}
|
|
}
|
|
|
|
static int compute_qn(int N, int b, int offset, int pulse_cap, int stereo)
|
|
{
|
|
static const celt_int16 exp2_table8[8] =
|
|
{16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048};
|
|
int qn, qb;
|
|
int N2 = 2*N-1;
|
|
if (stereo && N==2)
|
|
N2--;
|
|
/* The upper limit ensures that in a stereo split with itheta==16384, we'll
|
|
always have enough bits left over to code at least one pulse in the
|
|
side; otherwise it would collapse, since it doesn't get folded. */
|
|
qb = IMIN(b-pulse_cap-(4<<BITRES), (b+N2*offset)/N2);
|
|
|
|
qb = IMIN(8<<BITRES, qb);
|
|
|
|
if (qb<(1<<BITRES>>1)) {
|
|
qn = 1;
|
|
} else {
|
|
qn = exp2_table8[qb&0x7]>>(14-(qb>>BITRES));
|
|
qn = (qn+1)>>1<<1;
|
|
}
|
|
celt_assert(qn <= 256);
|
|
return qn;
|
|
}
|
|
|
|
/* This function is responsible for encoding and decoding a band for both
|
|
the mono and stereo case. Even in the mono case, it can split the band
|
|
in two and transmit the energy difference with the two half-bands. It
|
|
can be called recursively so bands can end up being split in 8 parts. */
|
|
static unsigned quant_band(int encode, const CELTMode *m, int i, celt_norm *X, celt_norm *Y,
|
|
int N, int b, int spread, int B, int intensity, int tf_change, celt_norm *lowband, int resynth, ec_ctx *ec,
|
|
celt_int32 *remaining_bits, int LM, celt_norm *lowband_out, const celt_ener *bandE, int level,
|
|
celt_uint32 *seed, celt_word16 gain, celt_norm *lowband_scratch, int fill)
|
|
{
|
|
const unsigned char *cache;
|
|
int q;
|
|
int curr_bits;
|
|
int stereo, split;
|
|
int imid=0, iside=0;
|
|
int N0=N;
|
|
int N_B=N;
|
|
int N_B0;
|
|
int B0=B;
|
|
int time_divide=0;
|
|
int recombine=0;
|
|
int inv = 0;
|
|
celt_word16 mid=0, side=0;
|
|
int longBlocks;
|
|
unsigned cm=0;
|
|
|
|
longBlocks = B0==1;
|
|
|
|
N_B /= B;
|
|
N_B0 = N_B;
|
|
|
|
split = stereo = Y != NULL;
|
|
|
|
/* Special case for one sample */
|
|
if (N==1)
|
|
{
|
|
int c;
|
|
celt_norm *x = X;
|
|
c=0; do {
|
|
int sign=0;
|
|
if (*remaining_bits>=1<<BITRES)
|
|
{
|
|
if (encode)
|
|
{
|
|
sign = x[0]<0;
|
|
ec_enc_bits(ec, sign, 1);
|
|
} else {
|
|
sign = ec_dec_bits(ec, 1);
|
|
}
|
|
*remaining_bits -= 1<<BITRES;
|
|
b-=1<<BITRES;
|
|
}
|
|
if (resynth)
|
|
x[0] = sign ? -NORM_SCALING : NORM_SCALING;
|
|
x = Y;
|
|
} while (++c<1+stereo);
|
|
if (lowband_out)
|
|
lowband_out[0] = SHR16(X[0],4);
|
|
return 1;
|
|
}
|
|
|
|
if (!stereo && level == 0)
|
|
{
|
|
int k;
|
|
if (tf_change>0)
|
|
recombine = tf_change;
|
|
/* Band recombining to increase frequency resolution */
|
|
|
|
if (lowband && (recombine || ((N_B&1) == 0 && tf_change<0) || B0>1))
|
|
{
|
|
int j;
|
|
for (j=0;j<N;j++)
|
|
lowband_scratch[j] = lowband[j];
|
|
lowband = lowband_scratch;
|
|
}
|
|
|
|
for (k=0;k<recombine;k++)
|
|
{
|
|
static const unsigned char bit_interleave_table[16]={
|
|
0,1,1,1,2,3,3,3,2,3,3,3,2,3,3,3
|
|
};
|
|
if (encode)
|
|
haar1(X, N>>k, 1<<k);
|
|
if (lowband)
|
|
haar1(lowband, N>>k, 1<<k);
|
|
fill = bit_interleave_table[fill&0xF]|bit_interleave_table[fill>>4]<<2;
|
|
}
|
|
B>>=recombine;
|
|
N_B<<=recombine;
|
|
|
|
/* Increasing the time resolution */
|
|
while ((N_B&1) == 0 && tf_change<0)
|
|
{
|
|
if (encode)
|
|
haar1(X, N_B, B);
|
|
if (lowband)
|
|
haar1(lowband, N_B, B);
|
|
fill |= fill<<B;
|
|
B <<= 1;
|
|
N_B >>= 1;
|
|
time_divide++;
|
|
tf_change++;
|
|
}
|
|
B0=B;
|
|
N_B0 = N_B;
|
|
|
|
/* Reorganize the samples in time order instead of frequency order */
|
|
if (B0>1)
|
|
{
|
|
if (encode)
|
|
deinterleave_hadamard(X, N_B>>recombine, B0<<recombine, longBlocks);
|
|
if (lowband)
|
|
deinterleave_hadamard(lowband, N_B>>recombine, B0<<recombine, longBlocks);
|
|
}
|
|
}
|
|
|
|
/* If we need 1.5 more bit than we can produce, split the band in two. */
|
|
cache = m->cache.bits + m->cache.index[(LM+1)*m->nbEBands+i];
|
|
if (!stereo && LM != -1 && b > cache[cache[0]]+12 && N>2)
|
|
{
|
|
if (LM>0 || (N&1)==0)
|
|
{
|
|
N >>= 1;
|
|
Y = X+N;
|
|
split = 1;
|
|
LM -= 1;
|
|
if (B==1)
|
|
fill = (fill&1)|(fill<<1);
|
|
B = (B+1)>>1;
|
|
}
|
|
}
|
|
|
|
if (split)
|
|
{
|
|
int qn;
|
|
int itheta=0;
|
|
int mbits, sbits, delta;
|
|
int qalloc;
|
|
int pulse_cap;
|
|
int offset;
|
|
int orig_fill;
|
|
celt_int32 tell;
|
|
|
|
/* Decide on the resolution to give to the split parameter theta */
|
|
pulse_cap = m->logN[i]+(LM<<BITRES);
|
|
offset = (pulse_cap>>1) - (stereo&&N==2 ? QTHETA_OFFSET_TWOPHASE : QTHETA_OFFSET);
|
|
qn = compute_qn(N, b, offset, pulse_cap, stereo);
|
|
if (stereo && i>=intensity)
|
|
qn = 1;
|
|
if (encode)
|
|
{
|
|
/* theta is the atan() of the ratio between the (normalized)
|
|
side and mid. With just that parameter, we can re-scale both
|
|
mid and side because we know that 1) they have unit norm and
|
|
2) they are orthogonal. */
|
|
itheta = stereo_itheta(X, Y, stereo, N);
|
|
}
|
|
tell = ec_tell_frac(ec);
|
|
if (qn!=1)
|
|
{
|
|
if (encode)
|
|
itheta = (itheta*qn+8192)>>14;
|
|
|
|
/* Entropy coding of the angle. We use a uniform pdf for the
|
|
time split, a step for stereo, and a triangular one for the rest. */
|
|
if (stereo && N>2)
|
|
{
|
|
int p0 = 3;
|
|
int x = itheta;
|
|
int x0 = qn/2;
|
|
int ft = p0*(x0+1) + x0;
|
|
/* Use a probability of p0 up to itheta=8192 and then use 1 after */
|
|
if (encode)
|
|
{
|
|
ec_encode(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft);
|
|
} else {
|
|
int fs;
|
|
fs=ec_decode(ec,ft);
|
|
if (fs<(x0+1)*p0)
|
|
x=fs/p0;
|
|
else
|
|
x=x0+1+(fs-(x0+1)*p0);
|
|
ec_dec_update(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft);
|
|
itheta = x;
|
|
}
|
|
} else if (B0>1 || stereo) {
|
|
/* Uniform pdf */
|
|
if (encode)
|
|
ec_enc_uint(ec, itheta, qn+1);
|
|
else
|
|
itheta = ec_dec_uint(ec, qn+1);
|
|
} else {
|
|
int fs=1, ft;
|
|
ft = ((qn>>1)+1)*((qn>>1)+1);
|
|
if (encode)
|
|
{
|
|
int fl;
|
|
|
|
fs = itheta <= (qn>>1) ? itheta + 1 : qn + 1 - itheta;
|
|
fl = itheta <= (qn>>1) ? itheta*(itheta + 1)>>1 :
|
|
ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1);
|
|
|
|
ec_encode(ec, fl, fl+fs, ft);
|
|
} else {
|
|
/* Triangular pdf */
|
|
int fl=0;
|
|
int fm;
|
|
fm = ec_decode(ec, ft);
|
|
|
|
if (fm < ((qn>>1)*((qn>>1) + 1)>>1))
|
|
{
|
|
itheta = (isqrt32(8*(celt_uint32)fm + 1) - 1)>>1;
|
|
fs = itheta + 1;
|
|
fl = itheta*(itheta + 1)>>1;
|
|
}
|
|
else
|
|
{
|
|
itheta = (2*(qn + 1)
|
|
- isqrt32(8*(celt_uint32)(ft - fm - 1) + 1))>>1;
|
|
fs = qn + 1 - itheta;
|
|
fl = ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1);
|
|
}
|
|
|
|
ec_dec_update(ec, fl, fl+fs, ft);
|
|
}
|
|
}
|
|
itheta = (celt_int32)itheta*16384/qn;
|
|
if (encode && stereo)
|
|
{
|
|
if (itheta==0)
|
|
intensity_stereo(m, X, Y, bandE, i, N);
|
|
else
|
|
stereo_split(X, Y, N);
|
|
}
|
|
/* TODO: Renormalising X and Y *may* help fixed-point a bit at very high rate.
|
|
Let's do that at higher complexity */
|
|
} else if (stereo) {
|
|
if (encode)
|
|
{
|
|
inv = itheta > 8192;
|
|
if (inv)
|
|
{
|
|
int j;
|
|
for (j=0;j<N;j++)
|
|
Y[j] = -Y[j];
|
|
}
|
|
intensity_stereo(m, X, Y, bandE, i, N);
|
|
}
|
|
if (b>2<<BITRES && *remaining_bits > 2<<BITRES)
|
|
{
|
|
if (encode)
|
|
ec_enc_bit_logp(ec, inv, 2);
|
|
else
|
|
inv = ec_dec_bit_logp(ec, 2);
|
|
} else
|
|
inv = 0;
|
|
itheta = 0;
|
|
}
|
|
qalloc = ec_tell_frac(ec) - tell;
|
|
b -= qalloc;
|
|
|
|
orig_fill = fill;
|
|
if (itheta == 0)
|
|
{
|
|
imid = 32767;
|
|
iside = 0;
|
|
fill &= (1<<B)-1;
|
|
delta = -16384;
|
|
} else if (itheta == 16384)
|
|
{
|
|
imid = 0;
|
|
iside = 32767;
|
|
fill &= ((1<<B)-1)<<B;
|
|
delta = 16384;
|
|
} else {
|
|
imid = bitexact_cos(itheta);
|
|
iside = bitexact_cos(16384-itheta);
|
|
/* This is the mid vs side allocation that minimizes squared error
|
|
in that band. */
|
|
delta = FRAC_MUL16((N-1)<<7,bitexact_log2tan(iside,imid));
|
|
}
|
|
|
|
#ifdef FIXED_POINT
|
|
mid = imid;
|
|
side = iside;
|
|
#else
|
|
mid = (1.f/32768)*imid;
|
|
side = (1.f/32768)*iside;
|
|
#endif
|
|
|
|
/* This is a special case for N=2 that only works for stereo and takes
|
|
advantage of the fact that mid and side are orthogonal to encode
|
|
the side with just one bit. */
|
|
if (N==2 && stereo)
|
|
{
|
|
int c;
|
|
int sign=0;
|
|
celt_norm *x2, *y2;
|
|
mbits = b;
|
|
sbits = 0;
|
|
/* Only need one bit for the side */
|
|
if (itheta != 0 && itheta != 16384)
|
|
sbits = 1<<BITRES;
|
|
mbits -= sbits;
|
|
c = itheta > 8192;
|
|
*remaining_bits -= qalloc+sbits;
|
|
|
|
x2 = c ? Y : X;
|
|
y2 = c ? X : Y;
|
|
if (sbits)
|
|
{
|
|
if (encode)
|
|
{
|
|
/* Here we only need to encode a sign for the side */
|
|
sign = x2[0]*y2[1] - x2[1]*y2[0] < 0;
|
|
ec_enc_bits(ec, sign, 1);
|
|
} else {
|
|
sign = ec_dec_bits(ec, 1);
|
|
}
|
|
}
|
|
sign = 1-2*sign;
|
|
/* We use orig_fill here because we want to fold the side, but if
|
|
itheta==16384, we'll have cleared the low bits of fill. */
|
|
cm = quant_band(encode, m, i, x2, NULL, N, mbits, spread, B, intensity, tf_change, lowband, resynth, ec, remaining_bits, LM, lowband_out, NULL, level, seed, gain, lowband_scratch, orig_fill);
|
|
/* We don't split N=2 bands, so cm is either 1 or 0 (for a fold-collapse),
|
|
and there's no need to worry about mixing with the other channel. */
|
|
y2[0] = -sign*x2[1];
|
|
y2[1] = sign*x2[0];
|
|
if (resynth)
|
|
{
|
|
celt_norm tmp;
|
|
X[0] = MULT16_16_Q15(mid, X[0]);
|
|
X[1] = MULT16_16_Q15(mid, X[1]);
|
|
Y[0] = MULT16_16_Q15(side, Y[0]);
|
|
Y[1] = MULT16_16_Q15(side, Y[1]);
|
|
tmp = X[0];
|
|
X[0] = SUB16(tmp,Y[0]);
|
|
Y[0] = ADD16(tmp,Y[0]);
|
|
tmp = X[1];
|
|
X[1] = SUB16(tmp,Y[1]);
|
|
Y[1] = ADD16(tmp,Y[1]);
|
|
}
|
|
} else {
|
|
/* "Normal" split code */
|
|
celt_norm *next_lowband2=NULL;
|
|
celt_norm *next_lowband_out1=NULL;
|
|
int next_level=0;
|
|
celt_int32 rebalance;
|
|
|
|
/* Give more bits to low-energy MDCTs than they would otherwise deserve */
|
|
if (B0>1 && !stereo && (itheta&0x3fff))
|
|
{
|
|
if (itheta > 8192)
|
|
/* Rough approximation for pre-echo masking */
|
|
delta -= delta>>(4-LM);
|
|
else
|
|
/* Corresponds to a forward-masking slope of 1.5 dB per 10 ms */
|
|
delta = IMIN(0, delta + (N<<BITRES>>(5-LM)));
|
|
}
|
|
mbits = IMAX(0, IMIN(b, (b-delta)/2));
|
|
sbits = b-mbits;
|
|
*remaining_bits -= qalloc;
|
|
|
|
if (lowband && !stereo)
|
|
next_lowband2 = lowband+N; /* >32-bit split case */
|
|
|
|
/* Only stereo needs to pass on lowband_out. Otherwise, it's
|
|
handled at the end */
|
|
if (stereo)
|
|
next_lowband_out1 = lowband_out;
|
|
else
|
|
next_level = level+1;
|
|
|
|
rebalance = *remaining_bits;
|
|
if (mbits >= sbits)
|
|
{
|
|
/* In stereo mode, we do not apply a scaling to the mid because we need the normalized
|
|
mid for folding later */
|
|
cm = quant_band(encode, m, i, X, NULL, N, mbits, spread, B, intensity, tf_change,
|
|
lowband, resynth, ec, remaining_bits, LM, next_lowband_out1,
|
|
NULL, next_level, seed, stereo ? Q15ONE : MULT16_16_P15(gain,mid), lowband_scratch, fill);
|
|
rebalance = mbits - (rebalance-*remaining_bits);
|
|
if (rebalance > 3<<BITRES && itheta!=0)
|
|
sbits += rebalance - (3<<BITRES);
|
|
|
|
/* For a stereo split, the high bits of fill are always zero, so no
|
|
folding will be done to the side. */
|
|
cm |= quant_band(encode, m, i, Y, NULL, N, sbits, spread, B, intensity, tf_change,
|
|
next_lowband2, resynth, ec, remaining_bits, LM, NULL,
|
|
NULL, next_level, seed, MULT16_16_P15(gain,side), NULL, fill>>B)<<(B0>>1&stereo-1);
|
|
} else {
|
|
/* For a stereo split, the high bits of fill are always zero, so no
|
|
folding will be done to the side. */
|
|
cm = quant_band(encode, m, i, Y, NULL, N, sbits, spread, B, intensity, tf_change,
|
|
next_lowband2, resynth, ec, remaining_bits, LM, NULL,
|
|
NULL, next_level, seed, MULT16_16_P15(gain,side), NULL, fill>>B)<<(B0>>1&stereo-1);
|
|
rebalance = sbits - (rebalance-*remaining_bits);
|
|
if (rebalance > 3<<BITRES && itheta!=16384)
|
|
mbits += rebalance - (3<<BITRES);
|
|
/* In stereo mode, we do not apply a scaling to the mid because we need the normalized
|
|
mid for folding later */
|
|
cm |= quant_band(encode, m, i, X, NULL, N, mbits, spread, B, intensity, tf_change,
|
|
lowband, resynth, ec, remaining_bits, LM, next_lowband_out1,
|
|
NULL, next_level, seed, stereo ? Q15ONE : MULT16_16_P15(gain,mid), lowband_scratch, fill);
|
|
}
|
|
}
|
|
|
|
} else {
|
|
/* This is the basic no-split case */
|
|
q = bits2pulses(m, i, LM, b);
|
|
curr_bits = pulses2bits(m, i, LM, q);
|
|
*remaining_bits -= curr_bits;
|
|
|
|
/* Ensures we can never bust the budget */
|
|
while (*remaining_bits < 0 && q > 0)
|
|
{
|
|
*remaining_bits += curr_bits;
|
|
q--;
|
|
curr_bits = pulses2bits(m, i, LM, q);
|
|
*remaining_bits -= curr_bits;
|
|
}
|
|
|
|
if (q!=0)
|
|
{
|
|
int K = get_pulses(q);
|
|
|
|
/* Finally do the actual quantization */
|
|
if (encode)
|
|
cm = alg_quant(X, N, K, spread, B, resynth, ec, gain);
|
|
else
|
|
cm = alg_unquant(X, N, K, spread, B, ec, gain);
|
|
} else {
|
|
/* If there's no pulse, fill the band anyway */
|
|
int j;
|
|
if (resynth)
|
|
{
|
|
unsigned cm_mask;
|
|
/*B can be as large as 16, so this shift might overflow an int on a
|
|
16-bit platform; use a long to get defined behavior.*/
|
|
cm_mask = (unsigned)(1UL<<B)-1;
|
|
fill &= cm_mask;
|
|
if (!fill)
|
|
{
|
|
for (j=0;j<N;j++)
|
|
X[j] = 0;
|
|
} else {
|
|
if (lowband == NULL)
|
|
{
|
|
/* Noise */
|
|
for (j=0;j<N;j++)
|
|
{
|
|
*seed = lcg_rand(*seed);
|
|
X[j] = (celt_int32)(*seed)>>20;
|
|
}
|
|
cm = cm_mask;
|
|
} else {
|
|
/* Folded spectrum */
|
|
for (j=0;j<N;j++)
|
|
X[j] = lowband[j];
|
|
cm = fill;
|
|
}
|
|
renormalise_vector(X, N, gain);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This code is used by the decoder and by the resynthesis-enabled encoder */
|
|
if (resynth)
|
|
{
|
|
if (stereo)
|
|
{
|
|
if (N!=2)
|
|
stereo_merge(X, Y, mid, N);
|
|
if (inv)
|
|
{
|
|
int j;
|
|
for (j=0;j<N;j++)
|
|
Y[j] = -Y[j];
|
|
}
|
|
} else if (level == 0)
|
|
{
|
|
int k;
|
|
|
|
/* Undo the sample reorganization going from time order to frequency order */
|
|
if (B0>1)
|
|
interleave_hadamard(X, N_B>>recombine, B0<<recombine, longBlocks);
|
|
|
|
/* Undo time-freq changes that we did earlier */
|
|
N_B = N_B0;
|
|
B = B0;
|
|
for (k=0;k<time_divide;k++)
|
|
{
|
|
B >>= 1;
|
|
N_B <<= 1;
|
|
cm |= cm>>B;
|
|
haar1(X, N_B, B);
|
|
}
|
|
|
|
for (k=0;k<recombine;k++)
|
|
{
|
|
static const unsigned char bit_deinterleave_table[16]={
|
|
0x00,0x03,0x0C,0x0F,0x30,0x33,0x3C,0x3F,
|
|
0xC0,0xC3,0xCC,0xCF,0xF0,0xF3,0xFC,0xFF
|
|
};
|
|
cm = bit_deinterleave_table[cm];
|
|
haar1(X, N0>>k, 1<<k);
|
|
}
|
|
B<<=recombine;
|
|
|
|
/* Scale output for later folding */
|
|
if (lowband_out)
|
|
{
|
|
int j;
|
|
celt_word16 n;
|
|
n = celt_sqrt(SHL32(EXTEND32(N0),22));
|
|
for (j=0;j<N0;j++)
|
|
lowband_out[j] = MULT16_16_Q15(n,X[j]);
|
|
}
|
|
cm &= (1<<B)-1;
|
|
}
|
|
}
|
|
return cm;
|
|
}
|
|
|
|
void quant_all_bands(int encode, const CELTMode *m, int start, int end,
|
|
celt_norm *_X, celt_norm *_Y, unsigned char *collapse_masks, const celt_ener *bandE, int *pulses,
|
|
int shortBlocks, int spread, int dual_stereo, int intensity, int *tf_res, int resynth,
|
|
celt_int32 total_bits, celt_int32 balance, ec_ctx *ec, int LM, int codedBands, ec_uint32 *seed)
|
|
{
|
|
int i;
|
|
celt_int32 remaining_bits;
|
|
const celt_int16 * restrict eBands = m->eBands;
|
|
celt_norm * restrict norm, * restrict norm2;
|
|
VARDECL(celt_norm, _norm);
|
|
VARDECL(celt_norm, lowband_scratch);
|
|
int B;
|
|
int M;
|
|
int lowband_offset;
|
|
int update_lowband = 1;
|
|
int C = _Y != NULL ? 2 : 1;
|
|
SAVE_STACK;
|
|
|
|
M = 1<<LM;
|
|
B = shortBlocks ? M : 1;
|
|
ALLOC(_norm, C*M*eBands[m->nbEBands], celt_norm);
|
|
ALLOC(lowband_scratch, M*(eBands[m->nbEBands]-eBands[m->nbEBands-1]), celt_norm);
|
|
norm = _norm;
|
|
norm2 = norm + M*eBands[m->nbEBands];
|
|
|
|
lowband_offset = 0;
|
|
for (i=start;i<end;i++)
|
|
{
|
|
celt_int32 tell;
|
|
int b;
|
|
int N;
|
|
celt_int32 curr_balance;
|
|
int effective_lowband=-1;
|
|
celt_norm * restrict X, * restrict Y;
|
|
int tf_change=0;
|
|
unsigned x_cm;
|
|
unsigned y_cm;
|
|
|
|
X = _X+M*eBands[i];
|
|
if (_Y!=NULL)
|
|
Y = _Y+M*eBands[i];
|
|
else
|
|
Y = NULL;
|
|
N = M*eBands[i+1]-M*eBands[i];
|
|
tell = ec_tell_frac(ec);
|
|
|
|
/* Compute how many bits we want to allocate to this band */
|
|
if (i != start)
|
|
balance -= tell;
|
|
remaining_bits = total_bits-tell-1;
|
|
if (i <= codedBands-1)
|
|
{
|
|
curr_balance = balance / IMIN(3, codedBands-i);
|
|
b = IMAX(0, IMIN(16383, IMIN(remaining_bits+1,pulses[i]+curr_balance)));
|
|
} else {
|
|
b = 0;
|
|
}
|
|
|
|
if (resynth && M*eBands[i]-N >= M*eBands[start] && (update_lowband || lowband_offset==0))
|
|
lowband_offset = i;
|
|
|
|
tf_change = tf_res[i];
|
|
if (i>=m->effEBands)
|
|
{
|
|
X=norm;
|
|
if (_Y!=NULL)
|
|
Y = norm;
|
|
}
|
|
|
|
/* Get a conservative estimate of the collapse_mask's for the bands we're
|
|
going to be folding from. */
|
|
if (lowband_offset != 0 && (spread!=SPREAD_AGGRESSIVE || B>1 || tf_change<0))
|
|
{
|
|
int fold_start;
|
|
int fold_end;
|
|
int fold_i;
|
|
/* This ensures we never repeat spectral content within one band */
|
|
effective_lowband = IMAX(M*eBands[start], M*eBands[lowband_offset]-N);
|
|
fold_start = lowband_offset;
|
|
while(M*eBands[--fold_start] > effective_lowband);
|
|
fold_end = lowband_offset-1;
|
|
while(M*eBands[++fold_end] < effective_lowband+N);
|
|
x_cm = y_cm = 0;
|
|
fold_i = fold_start; do {
|
|
x_cm |= collapse_masks[fold_i*C+0];
|
|
y_cm |= collapse_masks[fold_i*C+C-1];
|
|
} while (++fold_i<fold_end);
|
|
}
|
|
/* Otherwise, we'll be using the LCG to fold, so all blocks will (almost
|
|
always) be non-zero.*/
|
|
else
|
|
x_cm = y_cm = (1<<B)-1;
|
|
|
|
if (dual_stereo && i==intensity)
|
|
{
|
|
int j;
|
|
|
|
/* Switch off dual stereo to do intensity */
|
|
dual_stereo = 0;
|
|
for (j=M*eBands[start];j<M*eBands[i];j++)
|
|
norm[j] = HALF32(norm[j]+norm2[j]);
|
|
}
|
|
if (dual_stereo)
|
|
{
|
|
x_cm = quant_band(encode, m, i, X, NULL, N, b/2, spread, B, intensity, tf_change,
|
|
effective_lowband != -1 ? norm+effective_lowband : NULL, resynth, ec, &remaining_bits, LM,
|
|
norm+M*eBands[i], bandE, 0, seed, Q15ONE, lowband_scratch, x_cm);
|
|
y_cm = quant_band(encode, m, i, Y, NULL, N, b/2, spread, B, intensity, tf_change,
|
|
effective_lowband != -1 ? norm2+effective_lowband : NULL, resynth, ec, &remaining_bits, LM,
|
|
norm2+M*eBands[i], bandE, 0, seed, Q15ONE, lowband_scratch, y_cm);
|
|
} else {
|
|
x_cm = quant_band(encode, m, i, X, Y, N, b, spread, B, intensity, tf_change,
|
|
effective_lowband != -1 ? norm+effective_lowband : NULL, resynth, ec, &remaining_bits, LM,
|
|
norm+M*eBands[i], bandE, 0, seed, Q15ONE, lowband_scratch, x_cm|y_cm);
|
|
y_cm = x_cm;
|
|
}
|
|
collapse_masks[i*C+0] = (unsigned char)x_cm;
|
|
collapse_masks[i*C+C-1] = (unsigned char)y_cm;
|
|
balance += pulses[i] + tell;
|
|
|
|
/* Update the folding position only as long as we have 1 bit/sample depth */
|
|
update_lowband = b>(N<<BITRES);
|
|
}
|
|
RESTORE_STACK;
|
|
}
|
|
|