216 lines
7.6 KiB
C
216 lines
7.6 KiB
C
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/*
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* AAC encoder TNS
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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 temporal noise shaping
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* @author Rostislav Pehlivanov ( atomnuker gmail com )
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*/
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#include "libavutil/libm.h"
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#include "aacenc.h"
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#include "aacenc_tns.h"
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#include "aactab.h"
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#include "aacenc_utils.h"
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#include "aacenc_quantization.h"
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/* Could be set to 3 to save an additional bit at the cost of little quality */
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#define TNS_Q_BITS 4
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/* Coefficient resolution in short windows */
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#define TNS_Q_BITS_IS8 4
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/* We really need the bits we save here elsewhere */
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#define TNS_ENABLE_COEF_COMPRESSION
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/* TNS will only be used if the LPC gain is within these margins */
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#define TNS_GAIN_THRESHOLD_LOW 1.4f
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#define TNS_GAIN_THRESHOLD_HIGH 1.16f*TNS_GAIN_THRESHOLD_LOW
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static inline int compress_coeffs(int *coef, int order, int c_bits)
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{
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int i;
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const int low_idx = c_bits ? 4 : 2;
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const int shift_val = c_bits ? 8 : 4;
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const int high_idx = c_bits ? 11 : 5;
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#ifndef TNS_ENABLE_COEF_COMPRESSION
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return 0;
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#endif /* TNS_ENABLE_COEF_COMPRESSION */
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for (i = 0; i < order; i++)
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if (coef[i] >= low_idx && coef[i] <= high_idx)
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return 0;
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for (i = 0; i < order; i++)
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coef[i] -= (coef[i] > high_idx) ? shift_val : 0;
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return 1;
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}
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/**
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* Encode TNS data.
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* Coefficient compression is simply not lossless as it should be
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* on any decoder tested and as such is not active.
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*/
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void ff_aac_encode_tns_info(AACEncContext *s, SingleChannelElement *sce)
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{
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TemporalNoiseShaping *tns = &sce->tns;
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int i, w, filt, coef_compress = 0, coef_len;
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const int is8 = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE;
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const int c_bits = is8 ? TNS_Q_BITS_IS8 == 4 : TNS_Q_BITS == 4;
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if (!sce->tns.present)
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return;
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for (i = 0; i < sce->ics.num_windows; i++) {
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put_bits(&s->pb, 2 - is8, sce->tns.n_filt[i]);
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if (!tns->n_filt[i])
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continue;
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put_bits(&s->pb, 1, c_bits);
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for (filt = 0; filt < tns->n_filt[i]; filt++) {
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put_bits(&s->pb, 6 - 2 * is8, tns->length[i][filt]);
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put_bits(&s->pb, 5 - 2 * is8, tns->order[i][filt]);
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if (!tns->order[i][filt])
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continue;
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put_bits(&s->pb, 1, tns->direction[i][filt]);
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coef_compress = compress_coeffs(tns->coef_idx[i][filt],
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tns->order[i][filt], c_bits);
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put_bits(&s->pb, 1, coef_compress);
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coef_len = c_bits + 3 - coef_compress;
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for (w = 0; w < tns->order[i][filt]; w++)
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put_bits(&s->pb, coef_len, tns->coef_idx[i][filt][w]);
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}
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}
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}
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/* Apply TNS filter */
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void ff_aac_apply_tns(AACEncContext *s, SingleChannelElement *sce)
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{
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TemporalNoiseShaping *tns = &sce->tns;
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IndividualChannelStream *ics = &sce->ics;
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int w, filt, m, i, top, order, bottom, start, end, size, inc;
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const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
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float lpc[TNS_MAX_ORDER];
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for (w = 0; w < ics->num_windows; w++) {
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bottom = ics->num_swb;
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for (filt = 0; filt < tns->n_filt[w]; filt++) {
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top = bottom;
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bottom = FFMAX(0, top - tns->length[w][filt]);
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order = tns->order[w][filt];
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if (order == 0)
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continue;
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// tns_decode_coef
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compute_lpc_coefs(tns->coef[w][filt], order, lpc, 0, 0, 0);
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start = ics->swb_offset[FFMIN(bottom, mmm)];
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end = ics->swb_offset[FFMIN( top, mmm)];
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if ((size = end - start) <= 0)
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continue;
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if (tns->direction[w][filt]) {
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inc = -1;
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start = end - 1;
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} else {
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inc = 1;
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}
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start += w * 128;
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/* AR filter */
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for (m = 0; m < size; m++, start += inc) {
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for (i = 1; i <= FFMIN(m, order); i++) {
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sce->coeffs[start] += lpc[i-1]*sce->pcoeffs[start - i*inc];
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}
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}
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}
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}
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}
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/*
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* c_bits - 1 if 4 bit coefficients, 0 if 3 bit coefficients
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*/
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static inline void quantize_coefs(double *coef, int *idx, float *lpc, int order,
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int c_bits)
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{
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int i;
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const float *quant_arr = tns_tmp2_map[c_bits];
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for (i = 0; i < order; i++) {
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idx[i] = quant_array_idx(coef[i], quant_arr, c_bits ? 16 : 8);
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lpc[i] = quant_arr[idx[i]];
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}
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}
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/*
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* 3 bits per coefficient with 8 short windows
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*/
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void ff_aac_search_for_tns(AACEncContext *s, SingleChannelElement *sce)
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{
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TemporalNoiseShaping *tns = &sce->tns;
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int w, g, count = 0;
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double gain, coefs[MAX_LPC_ORDER];
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const int mmm = FFMIN(sce->ics.tns_max_bands, sce->ics.max_sfb);
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const int is8 = sce->ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE;
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const int c_bits = is8 ? TNS_Q_BITS_IS8 == 4 : TNS_Q_BITS == 4;
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const int sfb_start = av_clip(tns_min_sfb[is8][s->samplerate_index], 0, mmm);
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const int sfb_end = av_clip(sce->ics.num_swb, 0, mmm);
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const int order = is8 ? 7 : s->profile == FF_PROFILE_AAC_LOW ? 12 : TNS_MAX_ORDER;
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const int slant = sce->ics.window_sequence[0] == LONG_STOP_SEQUENCE ? 1 :
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sce->ics.window_sequence[0] == LONG_START_SEQUENCE ? 0 : 2;
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const int sfb_len = sfb_end - sfb_start;
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const int coef_len = sce->ics.swb_offset[sfb_end] - sce->ics.swb_offset[sfb_start];
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if (coef_len <= 0 || sfb_len <= 0) {
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sce->tns.present = 0;
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return;
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}
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for (w = 0; w < sce->ics.num_windows; w++) {
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float en[2] = {0.0f, 0.0f};
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int oc_start = 0, os_start = 0;
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int coef_start = sce->ics.swb_offset[sfb_start];
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for (g = sfb_start; g < sce->ics.num_swb && g <= sfb_end; g++) {
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FFPsyBand *band = &s->psy.ch[s->cur_channel].psy_bands[w*16+g];
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if (g > sfb_start + (sfb_len/2))
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en[1] += band->energy;
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else
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en[0] += band->energy;
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}
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/* LPC */
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gain = ff_lpc_calc_ref_coefs_f(&s->lpc, &sce->coeffs[w*128 + coef_start],
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coef_len, order, coefs);
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if (!order || !isfinite(gain) || gain < TNS_GAIN_THRESHOLD_LOW || gain > TNS_GAIN_THRESHOLD_HIGH)
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continue;
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tns->n_filt[w] = is8 ? 1 : order != TNS_MAX_ORDER ? 2 : 3;
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for (g = 0; g < tns->n_filt[w]; g++) {
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tns->direction[w][g] = slant != 2 ? slant : en[g] < en[!g];
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tns->order[w][g] = g < tns->n_filt[w] ? order/tns->n_filt[w] : order - oc_start;
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tns->length[w][g] = g < tns->n_filt[w] ? sfb_len/tns->n_filt[w] : sfb_len - os_start;
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quantize_coefs(&coefs[oc_start], tns->coef_idx[w][g], tns->coef[w][g],
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tns->order[w][g], c_bits);
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oc_start += tns->order[w][g];
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os_start += tns->length[w][g];
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}
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count++;
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}
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sce->tns.present = !!count;
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}
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