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https://git.ffmpeg.org/ffmpeg.git
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284 lines
12 KiB
C
284 lines
12 KiB
C
/*
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* AAC encoder quantizer
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* Copyright (C) 2015 Rostislav Pehlivanov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AAC encoder quantizer
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* @author Rostislav Pehlivanov ( atomnuker gmail com )
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*/
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#ifndef AVCODEC_AACENC_QUANTIZATION_H
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#define AVCODEC_AACENC_QUANTIZATION_H
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#include "aactab.h"
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#include "aacenc.h"
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#include "aacenctab.h"
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#include "aacenc_utils.h"
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/**
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* Calculate rate distortion cost for quantizing with given codebook
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*
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* @return quantization distortion
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*/
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static av_always_inline float quantize_and_encode_band_cost_template(
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struct AACEncContext *s,
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PutBitContext *pb, const float *in, float *out,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy, int BT_ZERO, int BT_UNSIGNED,
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int BT_PAIR, int BT_ESC, int BT_NOISE, int BT_STEREO,
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const float ROUNDING)
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{
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const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512;
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const float Q = ff_aac_pow2sf_tab [q_idx];
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const float Q34 = ff_aac_pow34sf_tab[q_idx];
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const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512];
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const float CLIPPED_ESCAPE = 165140.0f*IQ;
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int i, j;
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float cost = 0;
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float qenergy = 0;
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const int dim = BT_PAIR ? 2 : 4;
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int resbits = 0;
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int off;
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if (BT_ZERO || BT_NOISE || BT_STEREO) {
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for (i = 0; i < size; i++)
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cost += in[i]*in[i];
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if (bits)
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*bits = 0;
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if (energy)
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*energy = qenergy;
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if (out) {
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for (i = 0; i < size; i += dim)
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for (j = 0; j < dim; j++)
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out[i+j] = 0.0f;
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}
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return cost * lambda;
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}
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if (!scaled) {
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abs_pow34_v(s->scoefs, in, size);
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scaled = s->scoefs;
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}
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quantize_bands(s->qcoefs, in, scaled, size, Q34, !BT_UNSIGNED, aac_cb_maxval[cb], ROUNDING);
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if (BT_UNSIGNED) {
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off = 0;
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} else {
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off = aac_cb_maxval[cb];
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}
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for (i = 0; i < size; i += dim) {
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const float *vec;
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int *quants = s->qcoefs + i;
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int curidx = 0;
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int curbits;
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float quantized, rd = 0.0f;
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for (j = 0; j < dim; j++) {
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curidx *= aac_cb_range[cb];
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curidx += quants[j] + off;
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}
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curbits = ff_aac_spectral_bits[cb-1][curidx];
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vec = &ff_aac_codebook_vectors[cb-1][curidx*dim];
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if (BT_UNSIGNED) {
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for (j = 0; j < dim; j++) {
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float t = fabsf(in[i+j]);
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float di;
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if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow
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if (t >= CLIPPED_ESCAPE) {
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quantized = CLIPPED_ESCAPE;
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curbits += 21;
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} else {
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int c = av_clip_uintp2(quant(t, Q, ROUNDING), 13);
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quantized = c*cbrtf(c)*IQ;
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curbits += av_log2(c)*2 - 4 + 1;
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}
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} else {
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quantized = vec[j]*IQ;
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}
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di = t - quantized;
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if (out)
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out[i+j] = in[i+j] >= 0 ? quantized : -quantized;
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if (vec[j] != 0.0f)
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curbits++;
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qenergy += quantized*quantized;
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rd += di*di;
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}
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} else {
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for (j = 0; j < dim; j++) {
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quantized = vec[j]*IQ;
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qenergy += quantized*quantized;
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if (out)
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out[i+j] = quantized;
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rd += (in[i+j] - quantized)*(in[i+j] - quantized);
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}
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}
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cost += rd * lambda + curbits;
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resbits += curbits;
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if (cost >= uplim)
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return uplim;
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if (pb) {
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put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]);
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if (BT_UNSIGNED)
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for (j = 0; j < dim; j++)
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if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f)
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put_bits(pb, 1, in[i+j] < 0.0f);
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if (BT_ESC) {
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for (j = 0; j < 2; j++) {
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if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) {
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int coef = av_clip_uintp2(quant(fabsf(in[i+j]), Q, ROUNDING), 13);
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int len = av_log2(coef);
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put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2);
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put_sbits(pb, len, coef);
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}
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}
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}
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}
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}
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if (bits)
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*bits = resbits;
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if (energy)
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*energy = qenergy;
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return cost;
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}
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static inline float quantize_and_encode_band_cost_NONE(struct AACEncContext *s, PutBitContext *pb,
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const float *in, float *quant, const float *scaled,
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int size, int scale_idx, int cb,
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const float lambda, const float uplim,
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int *bits, float *energy) {
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av_assert0(0);
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return 0.0f;
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}
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#define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, ROUNDING) \
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static float quantize_and_encode_band_cost_ ## NAME( \
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struct AACEncContext *s, \
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PutBitContext *pb, const float *in, float *quant, \
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const float *scaled, int size, int scale_idx, \
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int cb, const float lambda, const float uplim, \
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int *bits, float *energy) { \
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return quantize_and_encode_band_cost_template( \
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s, pb, in, quant, scaled, size, scale_idx, \
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BT_ESC ? ESC_BT : cb, lambda, uplim, bits, energy, \
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BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, \
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ROUNDING); \
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}
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1, 0, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC_RTZ, 0, 1, 1, 1, 0, 0, ROUND_TO_ZERO)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NOISE, 0, 0, 0, 0, 1, 0, ROUND_STANDARD)
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QUANTIZE_AND_ENCODE_BAND_COST_FUNC(STEREO,0, 0, 0, 0, 0, 1, ROUND_STANDARD)
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static float (*const quantize_and_encode_band_cost_arr[])(
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struct AACEncContext *s,
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PutBitContext *pb, const float *in, float *quant,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy) = {
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quantize_and_encode_band_cost_ZERO,
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quantize_and_encode_band_cost_SQUAD,
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quantize_and_encode_band_cost_SQUAD,
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quantize_and_encode_band_cost_UQUAD,
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quantize_and_encode_band_cost_UQUAD,
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quantize_and_encode_band_cost_SPAIR,
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quantize_and_encode_band_cost_SPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_ESC,
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quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
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quantize_and_encode_band_cost_NOISE,
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quantize_and_encode_band_cost_STEREO,
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quantize_and_encode_band_cost_STEREO,
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};
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static float (*const quantize_and_encode_band_cost_rtz_arr[])(
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struct AACEncContext *s,
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PutBitContext *pb, const float *in, float *quant,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy) = {
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quantize_and_encode_band_cost_ZERO,
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quantize_and_encode_band_cost_SQUAD,
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quantize_and_encode_band_cost_SQUAD,
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quantize_and_encode_band_cost_UQUAD,
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quantize_and_encode_band_cost_UQUAD,
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quantize_and_encode_band_cost_SPAIR,
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quantize_and_encode_band_cost_SPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_UPAIR,
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quantize_and_encode_band_cost_ESC_RTZ,
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quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */
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quantize_and_encode_band_cost_NOISE,
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quantize_and_encode_band_cost_STEREO,
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quantize_and_encode_band_cost_STEREO,
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};
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#define quantize_and_encode_band_cost( \
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s, pb, in, quant, scaled, size, scale_idx, cb, \
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lambda, uplim, bits, energy, rtz) \
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((rtz) ? quantize_and_encode_band_cost_rtz_arr : quantize_and_encode_band_cost_arr)[cb]( \
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s, pb, in, quant, scaled, size, scale_idx, cb, \
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lambda, uplim, bits, energy)
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static inline float quantize_band_cost(struct AACEncContext *s, const float *in,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy, int rtz)
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{
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return quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx,
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cb, lambda, uplim, bits, energy, rtz);
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}
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static inline int quantize_band_cost_bits(struct AACEncContext *s, const float *in,
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const float *scaled, int size, int scale_idx,
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int cb, const float lambda, const float uplim,
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int *bits, float *energy, int rtz)
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{
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int auxbits;
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quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx,
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cb, 0.0f, uplim, &auxbits, energy, rtz);
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if (bits) {
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*bits = auxbits;
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}
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return auxbits;
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}
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static inline void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb,
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const float *in, float *out, int size, int scale_idx,
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int cb, const float lambda, int rtz)
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{
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quantize_and_encode_band_cost(s, pb, in, out, NULL, size, scale_idx, cb, lambda,
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INFINITY, NULL, NULL, rtz);
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}
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#include "aacenc_quantization_misc.h"
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#endif /* AVCODEC_AACENC_QUANTIZATION_H */
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