ffmpeg / libavcodec / aacsbr.c @ bd9e0e29
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/*
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* AAC Spectral Band Replication decoding functions
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* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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* Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
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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 Spectral Band Replication decoding functions
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* @author Robert Swain ( rob opendot cl )
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*/
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#include "aac.h" |
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#include "sbr.h" |
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#include "aacsbr.h" |
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#include "aacsbrdata.h" |
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#include "fft.h" |
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#include "ps.h" |
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#include <stdint.h> |
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#include <float.h> |
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#define ENVELOPE_ADJUSTMENT_OFFSET 2 |
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#define NOISE_FLOOR_OFFSET 6.0f |
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|
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/**
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* SBR VLC tables
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*/
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enum {
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T_HUFFMAN_ENV_1_5DB, |
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F_HUFFMAN_ENV_1_5DB, |
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T_HUFFMAN_ENV_BAL_1_5DB, |
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F_HUFFMAN_ENV_BAL_1_5DB, |
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T_HUFFMAN_ENV_3_0DB, |
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F_HUFFMAN_ENV_3_0DB, |
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T_HUFFMAN_ENV_BAL_3_0DB, |
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F_HUFFMAN_ENV_BAL_3_0DB, |
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T_HUFFMAN_NOISE_3_0DB, |
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T_HUFFMAN_NOISE_BAL_3_0DB, |
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}; |
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|
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/**
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* bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
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*/
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enum {
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FIXFIX, |
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FIXVAR, |
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VARFIX, |
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VARVAR, |
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}; |
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enum {
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EXTENSION_ID_PS = 2,
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}; |
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static VLC vlc_sbr[10]; |
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static const int8_t vlc_sbr_lav[10] = |
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{ 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
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static const DECLARE_ALIGNED(16, float, zero64)[64]; |
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#define SBR_INIT_VLC_STATIC(num, size) \
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INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
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sbr_tmp[num].sbr_bits , 1, 1, \ |
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sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \ |
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size) |
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#define SBR_VLC_ROW(name) \
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{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
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av_cold void ff_aac_sbr_init(void) |
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{
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int n;
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static const struct { |
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const void *sbr_codes, *sbr_bits; |
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const unsigned int table_size, elem_size; |
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} sbr_tmp[] = {
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SBR_VLC_ROW(t_huffman_env_1_5dB), |
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SBR_VLC_ROW(f_huffman_env_1_5dB), |
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SBR_VLC_ROW(t_huffman_env_bal_1_5dB), |
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SBR_VLC_ROW(f_huffman_env_bal_1_5dB), |
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SBR_VLC_ROW(t_huffman_env_3_0dB), |
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SBR_VLC_ROW(f_huffman_env_3_0dB), |
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SBR_VLC_ROW(t_huffman_env_bal_3_0dB), |
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SBR_VLC_ROW(f_huffman_env_bal_3_0dB), |
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SBR_VLC_ROW(t_huffman_noise_3_0dB), |
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SBR_VLC_ROW(t_huffman_noise_bal_3_0dB), |
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}; |
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// SBR VLC table initialization
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SBR_INIT_VLC_STATIC(0, 1098); |
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SBR_INIT_VLC_STATIC(1, 1092); |
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SBR_INIT_VLC_STATIC(2, 768); |
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SBR_INIT_VLC_STATIC(3, 1026); |
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SBR_INIT_VLC_STATIC(4, 1058); |
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SBR_INIT_VLC_STATIC(5, 1052); |
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SBR_INIT_VLC_STATIC(6, 544); |
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SBR_INIT_VLC_STATIC(7, 544); |
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SBR_INIT_VLC_STATIC(8, 592); |
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SBR_INIT_VLC_STATIC(9, 512); |
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for (n = 1; n < 320; n++) |
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sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n]; |
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sbr_qmf_window_us[384] = -sbr_qmf_window_us[384]; |
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sbr_qmf_window_us[512] = -sbr_qmf_window_us[512]; |
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for (n = 0; n < 320; n++) |
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sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
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ff_ps_init(); |
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} |
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av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr)
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{
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sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32 |
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sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1; |
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sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); |
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sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128); |
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ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64); |
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ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0); |
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ff_ps_ctx_init(&sbr->ps); |
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} |
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av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
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{
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ff_mdct_end(&sbr->mdct); |
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ff_mdct_end(&sbr->mdct_ana); |
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} |
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static int qsort_comparison_function_int16(const void *a, const void *b) |
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{
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return *(const int16_t *)a - *(const int16_t *)b; |
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} |
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static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle) |
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{
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int i;
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for (i = 0; i <= last_el; i++) |
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if (table[i] == needle)
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return 1; |
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return 0; |
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} |
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/// Limiter Frequency Band Table (14496-3 sp04 p198)
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static void sbr_make_f_tablelim(SpectralBandReplication *sbr) |
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{
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int k;
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if (sbr->bs_limiter_bands > 0) { |
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static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2) |
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1.18509277094158210129f, //2^(0.49/2) |
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1.11987160404675912501f }; //2^(0.49/3) |
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const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1]; |
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int16_t patch_borders[7];
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uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
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patch_borders[0] = sbr->kx[1]; |
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for (k = 1; k <= sbr->num_patches; k++) |
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patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1]; |
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memcpy(sbr->f_tablelim, sbr->f_tablelow, |
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(sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0])); |
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if (sbr->num_patches > 1) |
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memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1, |
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(sbr->num_patches - 1) * sizeof(patch_borders[0])); |
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qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
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sizeof(sbr->f_tablelim[0]), |
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qsort_comparison_function_int16); |
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sbr->n_lim = sbr->n[0] + sbr->num_patches - 1; |
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while (out < sbr->f_tablelim + sbr->n_lim) {
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if (*in >= *out * lim_bands_per_octave_warped) {
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*++out = *in++; |
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} else if (*in == *out || |
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!in_table_int16(patch_borders, sbr->num_patches, *in)) {
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in++; |
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sbr->n_lim--; |
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} else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) { |
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*out = *in++; |
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sbr->n_lim--; |
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} else {
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*++out = *in++; |
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} |
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} |
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} else {
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sbr->f_tablelim[0] = sbr->f_tablelow[0]; |
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sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]]; |
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sbr->n_lim = 1;
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} |
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} |
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static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb) |
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{
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unsigned int cnt = get_bits_count(gb); |
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uint8_t bs_header_extra_1; |
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uint8_t bs_header_extra_2; |
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int old_bs_limiter_bands = sbr->bs_limiter_bands;
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SpectrumParameters old_spectrum_params; |
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sbr->start = 1;
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// Save last spectrum parameters variables to compare to new ones
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memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
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sbr->bs_amp_res_header = get_bits1(gb); |
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sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
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sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
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sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
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skip_bits(gb, 2); // bs_reserved |
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bs_header_extra_1 = get_bits1(gb); |
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bs_header_extra_2 = get_bits1(gb); |
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if (bs_header_extra_1) {
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sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
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sbr->spectrum_params.bs_alter_scale = get_bits1(gb); |
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sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
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} else {
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sbr->spectrum_params.bs_freq_scale = 2;
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sbr->spectrum_params.bs_alter_scale = 1;
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sbr->spectrum_params.bs_noise_bands = 2;
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} |
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// Check if spectrum parameters changed
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if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters))) |
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sbr->reset = 1;
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if (bs_header_extra_2) {
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sbr->bs_limiter_bands = get_bits(gb, 2);
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sbr->bs_limiter_gains = get_bits(gb, 2);
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sbr->bs_interpol_freq = get_bits1(gb); |
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sbr->bs_smoothing_mode = get_bits1(gb); |
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} else {
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sbr->bs_limiter_bands = 2;
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sbr->bs_limiter_gains = 2;
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sbr->bs_interpol_freq = 1;
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sbr->bs_smoothing_mode = 1;
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} |
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if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
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sbr_make_f_tablelim(sbr); |
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return get_bits_count(gb) - cnt;
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} |
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static int array_min_int16(const int16_t *array, int nel) |
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{
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int i, min = array[0]; |
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for (i = 1; i < nel; i++) |
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min = FFMIN(array[i], min); |
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return min;
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} |
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static void make_bands(int16_t* bands, int start, int stop, int num_bands) |
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{
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int k, previous, present;
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float base, prod;
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base = powf((float)stop / start, 1.0f / num_bands); |
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prod = start; |
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previous = start; |
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for (k = 0; k < num_bands-1; k++) { |
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prod *= base; |
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present = lrintf(prod); |
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bands[k] = present - previous; |
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previous = present; |
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} |
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bands[num_bands-1] = stop - previous;
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} |
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static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band) |
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{
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// Requirements (14496-3 sp04 p205)
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if (n_master <= 0) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
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return -1; |
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} |
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if (bs_xover_band >= n_master) {
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av_log(avctx, AV_LOG_ERROR, |
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"Invalid bitstream, crossover band index beyond array bounds: %d\n",
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bs_xover_band); |
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return -1; |
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} |
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return 0; |
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} |
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/// Master Frequency Band Table (14496-3 sp04 p194)
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static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr, |
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SpectrumParameters *spectrum) |
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{
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unsigned int temp, max_qmf_subbands; |
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unsigned int start_min, stop_min; |
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int k;
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const int8_t *sbr_offset_ptr;
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int16_t stop_dk[13];
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if (sbr->sample_rate < 32000) { |
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temp = 3000;
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} else if (sbr->sample_rate < 64000) { |
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temp = 4000;
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} else
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temp = 5000;
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start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
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stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
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switch (sbr->sample_rate) {
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case 16000: |
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sbr_offset_ptr = sbr_offset[0];
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break;
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case 22050: |
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sbr_offset_ptr = sbr_offset[1];
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break;
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case 24000: |
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sbr_offset_ptr = sbr_offset[2];
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break;
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case 32000: |
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sbr_offset_ptr = sbr_offset[3];
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break;
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case 44100: case 48000: case 64000: |
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sbr_offset_ptr = sbr_offset[4];
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break;
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case 88200: case 96000: case 128000: case 176400: case 192000: |
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sbr_offset_ptr = sbr_offset[5];
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break;
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default:
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av_log(ac->avctx, AV_LOG_ERROR, |
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"Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
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return -1; |
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} |
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|
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sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
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|
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if (spectrum->bs_stop_freq < 14) { |
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sbr->k[2] = stop_min;
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make_bands(stop_dk, stop_min, 64, 13); |
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qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16); |
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for (k = 0; k < spectrum->bs_stop_freq; k++) |
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sbr->k[2] += stop_dk[k];
|
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} else if (spectrum->bs_stop_freq == 14) { |
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sbr->k[2] = 2*sbr->k[0]; |
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} else if (spectrum->bs_stop_freq == 15) { |
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sbr->k[2] = 3*sbr->k[0]; |
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} else {
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av_log(ac->avctx, AV_LOG_ERROR, |
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"Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
|
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return -1; |
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} |
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sbr->k[2] = FFMIN(64, sbr->k[2]); |
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|
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// Requirements (14496-3 sp04 p205)
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if (sbr->sample_rate <= 32000) { |
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max_qmf_subbands = 48;
|
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} else if (sbr->sample_rate == 44100) { |
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max_qmf_subbands = 35;
|
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} else if (sbr->sample_rate >= 48000) |
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max_qmf_subbands = 32;
|
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|
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if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) { |
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av_log(ac->avctx, AV_LOG_ERROR, |
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"Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]); |
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return -1; |
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} |
| 380 |
|
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if (!spectrum->bs_freq_scale) {
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unsigned int dk; |
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int k2diff;
|
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|
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dk = spectrum->bs_alter_scale + 1;
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sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1; |
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if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
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return -1; |
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|
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for (k = 1; k <= sbr->n_master; k++) |
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sbr->f_master[k] = dk; |
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|
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k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk; |
| 394 |
if (k2diff < 0) { |
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sbr->f_master[1]--;
|
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sbr->f_master[2]-= (k2diff < -1); |
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} else if (k2diff) { |
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sbr->f_master[sbr->n_master]++; |
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} |
| 400 |
|
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sbr->f_master[0] = sbr->k[0]; |
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for (k = 1; k <= sbr->n_master; k++) |
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sbr->f_master[k] += sbr->f_master[k - 1];
|
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|
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} else {
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int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3} |
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int two_regions, num_bands_0;
|
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int vdk0_max, vdk1_min;
|
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int16_t vk0[49];
|
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|
| 411 |
if (49 * sbr->k[2] > 110 * sbr->k[0]) { |
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two_regions = 1;
|
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sbr->k[1] = 2 * sbr->k[0]; |
| 414 |
} else {
|
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two_regions = 0;
|
| 416 |
sbr->k[1] = sbr->k[2]; |
| 417 |
} |
| 418 |
|
| 419 |
num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2; |
| 420 |
|
| 421 |
if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205) |
| 422 |
av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
|
| 423 |
return -1; |
| 424 |
} |
| 425 |
|
| 426 |
vk0[0] = 0; |
| 427 |
|
| 428 |
make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0); |
| 429 |
|
| 430 |
qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16); |
| 431 |
vdk0_max = vk0[num_bands_0]; |
| 432 |
|
| 433 |
vk0[0] = sbr->k[0]; |
| 434 |
for (k = 1; k <= num_bands_0; k++) { |
| 435 |
if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205) |
| 436 |
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
|
| 437 |
return -1; |
| 438 |
} |
| 439 |
vk0[k] += vk0[k-1];
|
| 440 |
} |
| 441 |
|
| 442 |
if (two_regions) {
|
| 443 |
int16_t vk1[49];
|
| 444 |
float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f |
| 445 |
: 1.0f; // bs_alter_scale = {0,1} |
| 446 |
int num_bands_1 = lrintf(half_bands * invwarp *
|
| 447 |
log2f(sbr->k[2] / (float)sbr->k[1])) * 2; |
| 448 |
|
| 449 |
make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1); |
| 450 |
|
| 451 |
vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
|
| 452 |
|
| 453 |
if (vdk1_min < vdk0_max) {
|
| 454 |
int change;
|
| 455 |
qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); |
| 456 |
change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1); |
| 457 |
vk1[1] += change;
|
| 458 |
vk1[num_bands_1] -= change; |
| 459 |
} |
| 460 |
|
| 461 |
qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16); |
| 462 |
|
| 463 |
vk1[0] = sbr->k[1]; |
| 464 |
for (k = 1; k <= num_bands_1; k++) { |
| 465 |
if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205) |
| 466 |
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
|
| 467 |
return -1; |
| 468 |
} |
| 469 |
vk1[k] += vk1[k-1];
|
| 470 |
} |
| 471 |
|
| 472 |
sbr->n_master = num_bands_0 + num_bands_1; |
| 473 |
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
|
| 474 |
return -1; |
| 475 |
memcpy(&sbr->f_master[0], vk0,
|
| 476 |
(num_bands_0 + 1) * sizeof(sbr->f_master[0])); |
| 477 |
memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1, |
| 478 |
num_bands_1 * sizeof(sbr->f_master[0])); |
| 479 |
|
| 480 |
} else {
|
| 481 |
sbr->n_master = num_bands_0; |
| 482 |
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
|
| 483 |
return -1; |
| 484 |
memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0])); |
| 485 |
} |
| 486 |
} |
| 487 |
|
| 488 |
return 0; |
| 489 |
} |
| 490 |
|
| 491 |
/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
|
| 492 |
static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr) |
| 493 |
{
|
| 494 |
int i, k, sb = 0; |
| 495 |
int msb = sbr->k[0]; |
| 496 |
int usb = sbr->kx[1]; |
| 497 |
int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate; |
| 498 |
|
| 499 |
sbr->num_patches = 0;
|
| 500 |
|
| 501 |
if (goal_sb < sbr->kx[1] + sbr->m[1]) { |
| 502 |
for (k = 0; sbr->f_master[k] < goal_sb; k++) ; |
| 503 |
} else
|
| 504 |
k = sbr->n_master; |
| 505 |
|
| 506 |
do {
|
| 507 |
int odd = 0; |
| 508 |
for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) { |
| 509 |
sb = sbr->f_master[i]; |
| 510 |
odd = (sb + sbr->k[0]) & 1; |
| 511 |
} |
| 512 |
|
| 513 |
// Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
|
| 514 |
// After this check the final number of patches can still be six which is
|
| 515 |
// illegal however the Coding Technologies decoder check stream has a final
|
| 516 |
// count of 6 patches
|
| 517 |
if (sbr->num_patches > 5) { |
| 518 |
av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
|
| 519 |
return -1; |
| 520 |
} |
| 521 |
|
| 522 |
sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
|
| 523 |
sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
|
| 524 |
|
| 525 |
if (sbr->patch_num_subbands[sbr->num_patches] > 0) { |
| 526 |
usb = sb; |
| 527 |
msb = sb; |
| 528 |
sbr->num_patches++; |
| 529 |
} else
|
| 530 |
msb = sbr->kx[1];
|
| 531 |
|
| 532 |
if (sbr->f_master[k] - sb < 3) |
| 533 |
k = sbr->n_master; |
| 534 |
} while (sb != sbr->kx[1] + sbr->m[1]); |
| 535 |
|
| 536 |
if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1) |
| 537 |
sbr->num_patches--; |
| 538 |
|
| 539 |
return 0; |
| 540 |
} |
| 541 |
|
| 542 |
/// Derived Frequency Band Tables (14496-3 sp04 p197)
|
| 543 |
static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr) |
| 544 |
{
|
| 545 |
int k, temp;
|
| 546 |
|
| 547 |
sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
|
| 548 |
sbr->n[0] = (sbr->n[1] + 1) >> 1; |
| 549 |
|
| 550 |
memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band], |
| 551 |
(sbr->n[1] + 1) * sizeof(sbr->f_master[0])); |
| 552 |
sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0]; |
| 553 |
sbr->kx[1] = sbr->f_tablehigh[0]; |
| 554 |
|
| 555 |
// Requirements (14496-3 sp04 p205)
|
| 556 |
if (sbr->kx[1] + sbr->m[1] > 64) { |
| 557 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 558 |
"Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]); |
| 559 |
return -1; |
| 560 |
} |
| 561 |
if (sbr->kx[1] > 32) { |
| 562 |
av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]); |
| 563 |
return -1; |
| 564 |
} |
| 565 |
|
| 566 |
sbr->f_tablelow[0] = sbr->f_tablehigh[0]; |
| 567 |
temp = sbr->n[1] & 1; |
| 568 |
for (k = 1; k <= sbr->n[0]; k++) |
| 569 |
sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
|
| 570 |
|
| 571 |
sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
|
| 572 |
log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3 |
| 573 |
if (sbr->n_q > 5) { |
| 574 |
av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
|
| 575 |
return -1; |
| 576 |
} |
| 577 |
|
| 578 |
sbr->f_tablenoise[0] = sbr->f_tablelow[0]; |
| 579 |
temp = 0;
|
| 580 |
for (k = 1; k <= sbr->n_q; k++) { |
| 581 |
temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k); |
| 582 |
sbr->f_tablenoise[k] = sbr->f_tablelow[temp]; |
| 583 |
} |
| 584 |
|
| 585 |
if (sbr_hf_calc_npatches(ac, sbr) < 0) |
| 586 |
return -1; |
| 587 |
|
| 588 |
sbr_make_f_tablelim(sbr); |
| 589 |
|
| 590 |
sbr->data[0].f_indexnoise = 0; |
| 591 |
sbr->data[1].f_indexnoise = 0; |
| 592 |
|
| 593 |
return 0; |
| 594 |
} |
| 595 |
|
| 596 |
static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec, |
| 597 |
int elements)
|
| 598 |
{
|
| 599 |
int i;
|
| 600 |
for (i = 0; i < elements; i++) { |
| 601 |
vec[i] = get_bits1(gb); |
| 602 |
} |
| 603 |
} |
| 604 |
|
| 605 |
/** ceil(log2(index+1)) */
|
| 606 |
static const int8_t ceil_log2[] = { |
| 607 |
0, 1, 2, 2, 3, 3, |
| 608 |
}; |
| 609 |
|
| 610 |
static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, |
| 611 |
GetBitContext *gb, SBRData *ch_data) |
| 612 |
{
|
| 613 |
int i;
|
| 614 |
unsigned bs_pointer = 0; |
| 615 |
// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
|
| 616 |
int abs_bord_trail = 16; |
| 617 |
int num_rel_lead, num_rel_trail;
|
| 618 |
unsigned bs_num_env_old = ch_data->bs_num_env;
|
| 619 |
|
| 620 |
ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
|
| 621 |
ch_data->bs_amp_res = sbr->bs_amp_res_header; |
| 622 |
ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old]; |
| 623 |
|
| 624 |
switch (ch_data->bs_frame_class = get_bits(gb, 2)) { |
| 625 |
case FIXFIX:
|
| 626 |
ch_data->bs_num_env = 1 << get_bits(gb, 2); |
| 627 |
num_rel_lead = ch_data->bs_num_env - 1;
|
| 628 |
if (ch_data->bs_num_env == 1) |
| 629 |
ch_data->bs_amp_res = 0;
|
| 630 |
|
| 631 |
if (ch_data->bs_num_env > 4) { |
| 632 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 633 |
"Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
|
| 634 |
ch_data->bs_num_env); |
| 635 |
return -1; |
| 636 |
} |
| 637 |
|
| 638 |
ch_data->t_env[0] = 0; |
| 639 |
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 640 |
|
| 641 |
abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
|
| 642 |
ch_data->bs_num_env; |
| 643 |
for (i = 0; i < num_rel_lead; i++) |
| 644 |
ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
|
| 645 |
|
| 646 |
ch_data->bs_freq_res[1] = get_bits1(gb);
|
| 647 |
for (i = 1; i < ch_data->bs_num_env; i++) |
| 648 |
ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1]; |
| 649 |
break;
|
| 650 |
case FIXVAR:
|
| 651 |
abs_bord_trail += get_bits(gb, 2);
|
| 652 |
num_rel_trail = get_bits(gb, 2);
|
| 653 |
ch_data->bs_num_env = num_rel_trail + 1;
|
| 654 |
ch_data->t_env[0] = 0; |
| 655 |
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 656 |
|
| 657 |
for (i = 0; i < num_rel_trail; i++) |
| 658 |
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
|
| 659 |
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; |
| 660 |
|
| 661 |
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 662 |
|
| 663 |
for (i = 0; i < ch_data->bs_num_env; i++) |
| 664 |
ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb); |
| 665 |
break;
|
| 666 |
case VARFIX:
|
| 667 |
ch_data->t_env[0] = get_bits(gb, 2); |
| 668 |
num_rel_lead = get_bits(gb, 2);
|
| 669 |
ch_data->bs_num_env = num_rel_lead + 1;
|
| 670 |
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 671 |
|
| 672 |
for (i = 0; i < num_rel_lead; i++) |
| 673 |
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; |
| 674 |
|
| 675 |
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 676 |
|
| 677 |
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
|
| 678 |
break;
|
| 679 |
case VARVAR:
|
| 680 |
ch_data->t_env[0] = get_bits(gb, 2); |
| 681 |
abs_bord_trail += get_bits(gb, 2);
|
| 682 |
num_rel_lead = get_bits(gb, 2);
|
| 683 |
num_rel_trail = get_bits(gb, 2);
|
| 684 |
ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
|
| 685 |
|
| 686 |
if (ch_data->bs_num_env > 5) { |
| 687 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 688 |
"Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
|
| 689 |
ch_data->bs_num_env); |
| 690 |
return -1; |
| 691 |
} |
| 692 |
|
| 693 |
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; |
| 694 |
|
| 695 |
for (i = 0; i < num_rel_lead; i++) |
| 696 |
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; |
| 697 |
for (i = 0; i < num_rel_trail; i++) |
| 698 |
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
|
| 699 |
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; |
| 700 |
|
| 701 |
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); |
| 702 |
|
| 703 |
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
|
| 704 |
break;
|
| 705 |
} |
| 706 |
|
| 707 |
if (bs_pointer > ch_data->bs_num_env + 1) { |
| 708 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 709 |
"Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
|
| 710 |
bs_pointer); |
| 711 |
return -1; |
| 712 |
} |
| 713 |
|
| 714 |
for (i = 1; i <= ch_data->bs_num_env; i++) { |
| 715 |
if (ch_data->t_env[i-1] > ch_data->t_env[i]) { |
| 716 |
av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
|
| 717 |
return -1; |
| 718 |
} |
| 719 |
} |
| 720 |
|
| 721 |
ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1; |
| 722 |
|
| 723 |
ch_data->t_q[0] = ch_data->t_env[0]; |
| 724 |
ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env]; |
| 725 |
if (ch_data->bs_num_noise > 1) { |
| 726 |
unsigned int idx; |
| 727 |
if (ch_data->bs_frame_class == FIXFIX) {
|
| 728 |
idx = ch_data->bs_num_env >> 1;
|
| 729 |
} else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR |
| 730 |
idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1); |
| 731 |
} else { // VARFIX |
| 732 |
if (!bs_pointer)
|
| 733 |
idx = 1;
|
| 734 |
else if (bs_pointer == 1) |
| 735 |
idx = ch_data->bs_num_env - 1;
|
| 736 |
else // bs_pointer > 1 |
| 737 |
idx = bs_pointer - 1;
|
| 738 |
} |
| 739 |
ch_data->t_q[1] = ch_data->t_env[idx];
|
| 740 |
} |
| 741 |
|
| 742 |
ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev |
| 743 |
ch_data->e_a[1] = -1; |
| 744 |
if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0 |
| 745 |
ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer; |
| 746 |
} else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1 |
| 747 |
ch_data->e_a[1] = bs_pointer - 1; |
| 748 |
|
| 749 |
return 0; |
| 750 |
} |
| 751 |
|
| 752 |
static void copy_sbr_grid(SBRData *dst, const SBRData *src) { |
| 753 |
//These variables are saved from the previous frame rather than copied
|
| 754 |
dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
|
| 755 |
dst->t_env_num_env_old = dst->t_env[dst->bs_num_env]; |
| 756 |
dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env); |
| 757 |
|
| 758 |
//These variables are read from the bitstream and therefore copied
|
| 759 |
memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res)); |
| 760 |
memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
|
| 761 |
memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
|
| 762 |
dst->bs_num_env = src->bs_num_env; |
| 763 |
dst->bs_amp_res = src->bs_amp_res; |
| 764 |
dst->bs_num_noise = src->bs_num_noise; |
| 765 |
dst->bs_frame_class = src->bs_frame_class; |
| 766 |
dst->e_a[1] = src->e_a[1]; |
| 767 |
} |
| 768 |
|
| 769 |
/// Read how the envelope and noise floor data is delta coded
|
| 770 |
static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb, |
| 771 |
SBRData *ch_data) |
| 772 |
{
|
| 773 |
get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env); |
| 774 |
get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise); |
| 775 |
} |
| 776 |
|
| 777 |
/// Read inverse filtering data
|
| 778 |
static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb, |
| 779 |
SBRData *ch_data) |
| 780 |
{
|
| 781 |
int i;
|
| 782 |
|
| 783 |
memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t)); |
| 784 |
for (i = 0; i < sbr->n_q; i++) |
| 785 |
ch_data->bs_invf_mode[0][i] = get_bits(gb, 2); |
| 786 |
} |
| 787 |
|
| 788 |
static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb, |
| 789 |
SBRData *ch_data, int ch)
|
| 790 |
{
|
| 791 |
int bits;
|
| 792 |
int i, j, k;
|
| 793 |
VLC_TYPE (*t_huff)[2], (*f_huff)[2]; |
| 794 |
int t_lav, f_lav;
|
| 795 |
const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; |
| 796 |
const int odd = sbr->n[1] & 1; |
| 797 |
|
| 798 |
if (sbr->bs_coupling && ch) {
|
| 799 |
if (ch_data->bs_amp_res) {
|
| 800 |
bits = 5;
|
| 801 |
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table; |
| 802 |
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB]; |
| 803 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; |
| 804 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; |
| 805 |
} else {
|
| 806 |
bits = 6;
|
| 807 |
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table; |
| 808 |
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB]; |
| 809 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table; |
| 810 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB]; |
| 811 |
} |
| 812 |
} else {
|
| 813 |
if (ch_data->bs_amp_res) {
|
| 814 |
bits = 6;
|
| 815 |
t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table; |
| 816 |
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB]; |
| 817 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; |
| 818 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; |
| 819 |
} else {
|
| 820 |
bits = 7;
|
| 821 |
t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table; |
| 822 |
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB]; |
| 823 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table; |
| 824 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB]; |
| 825 |
} |
| 826 |
} |
| 827 |
|
| 828 |
for (i = 0; i < ch_data->bs_num_env; i++) { |
| 829 |
if (ch_data->bs_df_env[i]) {
|
| 830 |
// bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
|
| 831 |
if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) { |
| 832 |
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) |
| 833 |
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 834 |
} else if (ch_data->bs_freq_res[i + 1]) { |
| 835 |
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { |
| 836 |
k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1] |
| 837 |
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 838 |
} |
| 839 |
} else {
|
| 840 |
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) { |
| 841 |
k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j] |
| 842 |
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav); |
| 843 |
} |
| 844 |
} |
| 845 |
} else {
|
| 846 |
ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance |
| 847 |
for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) |
| 848 |
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); |
| 849 |
} |
| 850 |
} |
| 851 |
|
| 852 |
//assign 0th elements of env_facs from last elements
|
| 853 |
memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
|
| 854 |
sizeof(ch_data->env_facs[0])); |
| 855 |
} |
| 856 |
|
| 857 |
static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb, |
| 858 |
SBRData *ch_data, int ch)
|
| 859 |
{
|
| 860 |
int i, j;
|
| 861 |
VLC_TYPE (*t_huff)[2], (*f_huff)[2]; |
| 862 |
int t_lav, f_lav;
|
| 863 |
int delta = (ch == 1 && sbr->bs_coupling == 1) + 1; |
| 864 |
|
| 865 |
if (sbr->bs_coupling && ch) {
|
| 866 |
t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table; |
| 867 |
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB]; |
| 868 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table; |
| 869 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB]; |
| 870 |
} else {
|
| 871 |
t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table; |
| 872 |
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB]; |
| 873 |
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table; |
| 874 |
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB]; |
| 875 |
} |
| 876 |
|
| 877 |
for (i = 0; i < ch_data->bs_num_noise; i++) { |
| 878 |
if (ch_data->bs_df_noise[i]) {
|
| 879 |
for (j = 0; j < sbr->n_q; j++) |
| 880 |
ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav); |
| 881 |
} else {
|
| 882 |
ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level |
| 883 |
for (j = 1; j < sbr->n_q; j++) |
| 884 |
ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav); |
| 885 |
} |
| 886 |
} |
| 887 |
|
| 888 |
//assign 0th elements of noise_facs from last elements
|
| 889 |
memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
|
| 890 |
sizeof(ch_data->noise_facs[0])); |
| 891 |
} |
| 892 |
|
| 893 |
static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr, |
| 894 |
GetBitContext *gb, |
| 895 |
int bs_extension_id, int *num_bits_left) |
| 896 |
{
|
| 897 |
switch (bs_extension_id) {
|
| 898 |
case EXTENSION_ID_PS:
|
| 899 |
if (!ac->m4ac.ps) {
|
| 900 |
av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
|
| 901 |
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
|
| 902 |
*num_bits_left = 0;
|
| 903 |
} else {
|
| 904 |
#if 1 |
| 905 |
*num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left); |
| 906 |
#else
|
| 907 |
av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0); |
| 908 |
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
|
| 909 |
*num_bits_left = 0;
|
| 910 |
#endif
|
| 911 |
} |
| 912 |
break;
|
| 913 |
default:
|
| 914 |
av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1); |
| 915 |
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
|
| 916 |
*num_bits_left = 0;
|
| 917 |
break;
|
| 918 |
} |
| 919 |
} |
| 920 |
|
| 921 |
static int read_sbr_single_channel_element(AACContext *ac, |
| 922 |
SpectralBandReplication *sbr, |
| 923 |
GetBitContext *gb) |
| 924 |
{
|
| 925 |
if (get_bits1(gb)) // bs_data_extra |
| 926 |
skip_bits(gb, 4); // bs_reserved |
| 927 |
|
| 928 |
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) |
| 929 |
return -1; |
| 930 |
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
|
| 931 |
read_sbr_invf(sbr, gb, &sbr->data[0]);
|
| 932 |
read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 933 |
read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 934 |
|
| 935 |
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) |
| 936 |
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); |
| 937 |
|
| 938 |
return 0; |
| 939 |
} |
| 940 |
|
| 941 |
static int read_sbr_channel_pair_element(AACContext *ac, |
| 942 |
SpectralBandReplication *sbr, |
| 943 |
GetBitContext *gb) |
| 944 |
{
|
| 945 |
if (get_bits1(gb)) // bs_data_extra |
| 946 |
skip_bits(gb, 8); // bs_reserved |
| 947 |
|
| 948 |
if ((sbr->bs_coupling = get_bits1(gb))) {
|
| 949 |
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0])) |
| 950 |
return -1; |
| 951 |
copy_sbr_grid(&sbr->data[1], &sbr->data[0]); |
| 952 |
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
|
| 953 |
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
|
| 954 |
read_sbr_invf(sbr, gb, &sbr->data[0]);
|
| 955 |
memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); |
| 956 |
memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0])); |
| 957 |
read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 958 |
read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 959 |
read_sbr_envelope(sbr, gb, &sbr->data[1], 1); |
| 960 |
read_sbr_noise(sbr, gb, &sbr->data[1], 1); |
| 961 |
} else {
|
| 962 |
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) || |
| 963 |
read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
|
| 964 |
return -1; |
| 965 |
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
|
| 966 |
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
|
| 967 |
read_sbr_invf(sbr, gb, &sbr->data[0]);
|
| 968 |
read_sbr_invf(sbr, gb, &sbr->data[1]);
|
| 969 |
read_sbr_envelope(sbr, gb, &sbr->data[0], 0); |
| 970 |
read_sbr_envelope(sbr, gb, &sbr->data[1], 1); |
| 971 |
read_sbr_noise(sbr, gb, &sbr->data[0], 0); |
| 972 |
read_sbr_noise(sbr, gb, &sbr->data[1], 1); |
| 973 |
} |
| 974 |
|
| 975 |
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb))) |
| 976 |
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]); |
| 977 |
if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb))) |
| 978 |
get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]); |
| 979 |
|
| 980 |
return 0; |
| 981 |
} |
| 982 |
|
| 983 |
static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr, |
| 984 |
GetBitContext *gb, int id_aac)
|
| 985 |
{
|
| 986 |
unsigned int cnt = get_bits_count(gb); |
| 987 |
|
| 988 |
if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
|
| 989 |
if (read_sbr_single_channel_element(ac, sbr, gb)) {
|
| 990 |
sbr->start = 0;
|
| 991 |
return get_bits_count(gb) - cnt;
|
| 992 |
} |
| 993 |
} else if (id_aac == TYPE_CPE) { |
| 994 |
if (read_sbr_channel_pair_element(ac, sbr, gb)) {
|
| 995 |
sbr->start = 0;
|
| 996 |
return get_bits_count(gb) - cnt;
|
| 997 |
} |
| 998 |
} else {
|
| 999 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 1000 |
"Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
|
| 1001 |
sbr->start = 0;
|
| 1002 |
return get_bits_count(gb) - cnt;
|
| 1003 |
} |
| 1004 |
if (get_bits1(gb)) { // bs_extended_data |
| 1005 |
int num_bits_left = get_bits(gb, 4); // bs_extension_size |
| 1006 |
if (num_bits_left == 15) |
| 1007 |
num_bits_left += get_bits(gb, 8); // bs_esc_count |
| 1008 |
|
| 1009 |
num_bits_left <<= 3;
|
| 1010 |
while (num_bits_left > 7) { |
| 1011 |
num_bits_left -= 2;
|
| 1012 |
read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id |
| 1013 |
} |
| 1014 |
if (num_bits_left < 0) { |
| 1015 |
av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
|
| 1016 |
} |
| 1017 |
if (num_bits_left > 0) |
| 1018 |
skip_bits(gb, num_bits_left); |
| 1019 |
} |
| 1020 |
|
| 1021 |
return get_bits_count(gb) - cnt;
|
| 1022 |
} |
| 1023 |
|
| 1024 |
static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr) |
| 1025 |
{
|
| 1026 |
int err;
|
| 1027 |
err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params); |
| 1028 |
if (err >= 0) |
| 1029 |
err = sbr_make_f_derived(ac, sbr); |
| 1030 |
if (err < 0) { |
| 1031 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 1032 |
"SBR reset failed. Switching SBR to pure upsampling mode.\n");
|
| 1033 |
sbr->start = 0;
|
| 1034 |
} |
| 1035 |
} |
| 1036 |
|
| 1037 |
/**
|
| 1038 |
* Decode Spectral Band Replication extension data; reference: table 4.55.
|
| 1039 |
*
|
| 1040 |
* @param crc flag indicating the presence of CRC checksum
|
| 1041 |
* @param cnt length of TYPE_FIL syntactic element in bytes
|
| 1042 |
*
|
| 1043 |
* @return Returns number of bytes consumed from the TYPE_FIL element.
|
| 1044 |
*/
|
| 1045 |
int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
|
| 1046 |
GetBitContext *gb_host, int crc, int cnt, int id_aac) |
| 1047 |
{
|
| 1048 |
unsigned int num_sbr_bits = 0, num_align_bits; |
| 1049 |
unsigned bytes_read;
|
| 1050 |
GetBitContext gbc = *gb_host, *gb = &gbc; |
| 1051 |
skip_bits_long(gb_host, cnt*8 - 4); |
| 1052 |
|
| 1053 |
sbr->reset = 0;
|
| 1054 |
|
| 1055 |
if (!sbr->sample_rate)
|
| 1056 |
sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support |
| 1057 |
if (!ac->m4ac.ext_sample_rate)
|
| 1058 |
ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
|
| 1059 |
|
| 1060 |
if (crc) {
|
| 1061 |
skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check |
| 1062 |
num_sbr_bits += 10;
|
| 1063 |
} |
| 1064 |
|
| 1065 |
//Save some state from the previous frame.
|
| 1066 |
sbr->kx[0] = sbr->kx[1]; |
| 1067 |
sbr->m[0] = sbr->m[1]; |
| 1068 |
|
| 1069 |
num_sbr_bits++; |
| 1070 |
if (get_bits1(gb)) // bs_header_flag |
| 1071 |
num_sbr_bits += read_sbr_header(sbr, gb); |
| 1072 |
|
| 1073 |
if (sbr->reset)
|
| 1074 |
sbr_reset(ac, sbr); |
| 1075 |
|
| 1076 |
if (sbr->start)
|
| 1077 |
num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac); |
| 1078 |
|
| 1079 |
num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7; |
| 1080 |
bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3); |
| 1081 |
|
| 1082 |
if (bytes_read > cnt) {
|
| 1083 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 1084 |
"Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
|
| 1085 |
} |
| 1086 |
return cnt;
|
| 1087 |
} |
| 1088 |
|
| 1089 |
/// Dequantization and stereo decoding (14496-3 sp04 p203)
|
| 1090 |
static void sbr_dequant(SpectralBandReplication *sbr, int id_aac) |
| 1091 |
{
|
| 1092 |
int k, e;
|
| 1093 |
int ch;
|
| 1094 |
|
| 1095 |
if (id_aac == TYPE_CPE && sbr->bs_coupling) {
|
| 1096 |
float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f; |
| 1097 |
float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f; |
| 1098 |
for (e = 1; e <= sbr->data[0].bs_num_env; e++) { |
| 1099 |
for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) { |
| 1100 |
float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f); |
| 1101 |
float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha); |
| 1102 |
float fac = temp1 / (1.0f + temp2); |
| 1103 |
sbr->data[0].env_facs[e][k] = fac;
|
| 1104 |
sbr->data[1].env_facs[e][k] = fac * temp2;
|
| 1105 |
} |
| 1106 |
} |
| 1107 |
for (e = 1; e <= sbr->data[0].bs_num_noise; e++) { |
| 1108 |
for (k = 0; k < sbr->n_q; k++) { |
| 1109 |
float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1); |
| 1110 |
float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]); |
| 1111 |
float fac = temp1 / (1.0f + temp2); |
| 1112 |
sbr->data[0].noise_facs[e][k] = fac;
|
| 1113 |
sbr->data[1].noise_facs[e][k] = fac * temp2;
|
| 1114 |
} |
| 1115 |
} |
| 1116 |
} else { // SCE or one non-coupled CPE |
| 1117 |
for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { |
| 1118 |
float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f; |
| 1119 |
for (e = 1; e <= sbr->data[ch].bs_num_env; e++) |
| 1120 |
for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++) |
| 1121 |
sbr->data[ch].env_facs[e][k] = |
| 1122 |
exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f); |
| 1123 |
for (e = 1; e <= sbr->data[ch].bs_num_noise; e++) |
| 1124 |
for (k = 0; k < sbr->n_q; k++) |
| 1125 |
sbr->data[ch].noise_facs[e][k] = |
| 1126 |
exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]); |
| 1127 |
} |
| 1128 |
} |
| 1129 |
} |
| 1130 |
|
| 1131 |
/**
|
| 1132 |
* Analysis QMF Bank (14496-3 sp04 p206)
|
| 1133 |
*
|
| 1134 |
* @param x pointer to the beginning of the first sample window
|
| 1135 |
* @param W array of complex-valued samples split into subbands
|
| 1136 |
*/
|
| 1137 |
static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct, const float *in, float *x, |
| 1138 |
float z[320], float W[2][32][32][2], |
| 1139 |
float scale)
|
| 1140 |
{
|
| 1141 |
int i, k;
|
| 1142 |
memcpy(W[0], W[1], sizeof(W[0])); |
| 1143 |
memcpy(x , x+1024, (320-32)*sizeof(x[0])); |
| 1144 |
if (scale != 1.0f) |
| 1145 |
dsp->vector_fmul_scalar(x+288, in, scale, 1024); |
| 1146 |
else
|
| 1147 |
memcpy(x+288, in, 1024*sizeof(*x)); |
| 1148 |
for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames |
| 1149 |
// are not supported
|
| 1150 |
dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
|
| 1151 |
for (k = 0; k < 64; k++) { |
| 1152 |
float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256]; |
| 1153 |
z[k] = f; |
| 1154 |
} |
| 1155 |
//Shuffle to IMDCT
|
| 1156 |
z[64] = z[0]; |
| 1157 |
for (k = 1; k < 32; k++) { |
| 1158 |
z[64+2*k-1] = z[ k]; |
| 1159 |
z[64+2*k ] = -z[64-k]; |
| 1160 |
} |
| 1161 |
z[64+63] = z[32]; |
| 1162 |
|
| 1163 |
ff_imdct_half(mdct, z, z+64);
|
| 1164 |
for (k = 0; k < 32; k++) { |
| 1165 |
W[1][i][k][0] = -z[63-k]; |
| 1166 |
W[1][i][k][1] = z[k]; |
| 1167 |
} |
| 1168 |
x += 32;
|
| 1169 |
} |
| 1170 |
} |
| 1171 |
|
| 1172 |
/**
|
| 1173 |
* Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
|
| 1174 |
* (14496-3 sp04 p206)
|
| 1175 |
*/
|
| 1176 |
static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct, |
| 1177 |
float *out, float X[2][38][64], |
| 1178 |
float mdct_buf[2][64], |
| 1179 |
float *v0, int *v_off, const unsigned int div, |
| 1180 |
float bias, float scale) |
| 1181 |
{
|
| 1182 |
int i, n;
|
| 1183 |
const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us; |
| 1184 |
int scale_and_bias = scale != 1.0f || bias != 0.0f; |
| 1185 |
float *v;
|
| 1186 |
for (i = 0; i < 32; i++) { |
| 1187 |
if (*v_off == 0) { |
| 1188 |
int saved_samples = (1280 - 128) >> div; |
| 1189 |
memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float)); |
| 1190 |
*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
|
| 1191 |
} else {
|
| 1192 |
*v_off -= 128 >> div;
|
| 1193 |
} |
| 1194 |
v = v0 + *v_off; |
| 1195 |
if (div) {
|
| 1196 |
for (n = 0; n < 32; n++) { |
| 1197 |
X[0][i][ n] = -X[0][i][n]; |
| 1198 |
X[0][i][32+n] = X[1][i][31-n]; |
| 1199 |
} |
| 1200 |
ff_imdct_half(mdct, mdct_buf[0], X[0][i]); |
| 1201 |
for (n = 0; n < 32; n++) { |
| 1202 |
v[ n] = mdct_buf[0][63 - 2*n]; |
| 1203 |
v[63 - n] = -mdct_buf[0][62 - 2*n]; |
| 1204 |
} |
| 1205 |
} else {
|
| 1206 |
for (n = 1; n < 64; n+=2) { |
| 1207 |
X[1][i][n] = -X[1][i][n]; |
| 1208 |
} |
| 1209 |
ff_imdct_half(mdct, mdct_buf[0], X[0][i]); |
| 1210 |
ff_imdct_half(mdct, mdct_buf[1], X[1][i]); |
| 1211 |
for (n = 0; n < 64; n++) { |
| 1212 |
v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ]; |
| 1213 |
v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ]; |
| 1214 |
} |
| 1215 |
} |
| 1216 |
dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
|
| 1217 |
dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div); |
| 1218 |
dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div); |
| 1219 |
dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div); |
| 1220 |
dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div); |
| 1221 |
dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div); |
| 1222 |
dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div); |
| 1223 |
dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div); |
| 1224 |
dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div); |
| 1225 |
dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div); |
| 1226 |
if (scale_and_bias)
|
| 1227 |
for (n = 0; n < 64 >> div; n++) |
| 1228 |
out[n] = out[n] * scale + bias; |
| 1229 |
out += 64 >> div;
|
| 1230 |
} |
| 1231 |
} |
| 1232 |
|
| 1233 |
static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag) |
| 1234 |
{
|
| 1235 |
int i;
|
| 1236 |
float real_sum = 0.0f; |
| 1237 |
float imag_sum = 0.0f; |
| 1238 |
if (lag) {
|
| 1239 |
for (i = 1; i < 38; i++) { |
| 1240 |
real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1]; |
| 1241 |
imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0]; |
| 1242 |
} |
| 1243 |
phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1]; |
| 1244 |
phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0]; |
| 1245 |
if (lag == 1) { |
| 1246 |
phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1]; |
| 1247 |
phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0]; |
| 1248 |
} |
| 1249 |
} else {
|
| 1250 |
for (i = 1; i < 38; i++) { |
| 1251 |
real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1]; |
| 1252 |
} |
| 1253 |
phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1]; |
| 1254 |
phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1]; |
| 1255 |
} |
| 1256 |
} |
| 1257 |
|
| 1258 |
/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
|
| 1259 |
* (14496-3 sp04 p214)
|
| 1260 |
* Warning: This routine does not seem numerically stable.
|
| 1261 |
*/
|
| 1262 |
static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2], |
| 1263 |
const float X_low[32][40][2], int k0) |
| 1264 |
{
|
| 1265 |
int k;
|
| 1266 |
for (k = 0; k < k0; k++) { |
| 1267 |
float phi[3][2][2], dk; |
| 1268 |
|
| 1269 |
autocorrelate(X_low[k], phi, 0);
|
| 1270 |
autocorrelate(X_low[k], phi, 1);
|
| 1271 |
autocorrelate(X_low[k], phi, 2);
|
| 1272 |
|
| 1273 |
dk = phi[2][1][0] * phi[1][0][0] - |
| 1274 |
(phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f; |
| 1275 |
|
| 1276 |
if (!dk) {
|
| 1277 |
alpha1[k][0] = 0; |
| 1278 |
alpha1[k][1] = 0; |
| 1279 |
} else {
|
| 1280 |
float temp_real, temp_im;
|
| 1281 |
temp_real = phi[0][0][0] * phi[1][1][0] - |
| 1282 |
phi[0][0][1] * phi[1][1][1] - |
| 1283 |
phi[0][1][0] * phi[1][0][0]; |
| 1284 |
temp_im = phi[0][0][0] * phi[1][1][1] + |
| 1285 |
phi[0][0][1] * phi[1][1][0] - |
| 1286 |
phi[0][1][1] * phi[1][0][0]; |
| 1287 |
|
| 1288 |
alpha1[k][0] = temp_real / dk;
|
| 1289 |
alpha1[k][1] = temp_im / dk;
|
| 1290 |
} |
| 1291 |
|
| 1292 |
if (!phi[1][0][0]) { |
| 1293 |
alpha0[k][0] = 0; |
| 1294 |
alpha0[k][1] = 0; |
| 1295 |
} else {
|
| 1296 |
float temp_real, temp_im;
|
| 1297 |
temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] + |
| 1298 |
alpha1[k][1] * phi[1][1][1]; |
| 1299 |
temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] - |
| 1300 |
alpha1[k][0] * phi[1][1][1]; |
| 1301 |
|
| 1302 |
alpha0[k][0] = -temp_real / phi[1][0][0]; |
| 1303 |
alpha0[k][1] = -temp_im / phi[1][0][0]; |
| 1304 |
} |
| 1305 |
|
| 1306 |
if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f || |
| 1307 |
alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) { |
| 1308 |
alpha1[k][0] = 0; |
| 1309 |
alpha1[k][1] = 0; |
| 1310 |
alpha0[k][0] = 0; |
| 1311 |
alpha0[k][1] = 0; |
| 1312 |
} |
| 1313 |
} |
| 1314 |
} |
| 1315 |
|
| 1316 |
/// Chirp Factors (14496-3 sp04 p214)
|
| 1317 |
static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data) |
| 1318 |
{
|
| 1319 |
int i;
|
| 1320 |
float new_bw;
|
| 1321 |
static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f }; |
| 1322 |
|
| 1323 |
for (i = 0; i < sbr->n_q; i++) { |
| 1324 |
if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) { |
| 1325 |
new_bw = 0.6f; |
| 1326 |
} else
|
| 1327 |
new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
|
| 1328 |
|
| 1329 |
if (new_bw < ch_data->bw_array[i]) {
|
| 1330 |
new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i]; |
| 1331 |
} else
|
| 1332 |
new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i]; |
| 1333 |
ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw; |
| 1334 |
} |
| 1335 |
} |
| 1336 |
|
| 1337 |
/// Generate the subband filtered lowband
|
| 1338 |
static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr, |
| 1339 |
float X_low[32][40][2], const float W[2][32][32][2]) |
| 1340 |
{
|
| 1341 |
int i, k;
|
| 1342 |
const int t_HFGen = 8; |
| 1343 |
const int i_f = 32; |
| 1344 |
memset(X_low, 0, 32*sizeof(*X_low)); |
| 1345 |
for (k = 0; k < sbr->kx[1]; k++) { |
| 1346 |
for (i = t_HFGen; i < i_f + t_HFGen; i++) {
|
| 1347 |
X_low[k][i][0] = W[1][i - t_HFGen][k][0]; |
| 1348 |
X_low[k][i][1] = W[1][i - t_HFGen][k][1]; |
| 1349 |
} |
| 1350 |
} |
| 1351 |
for (k = 0; k < sbr->kx[0]; k++) { |
| 1352 |
for (i = 0; i < t_HFGen; i++) { |
| 1353 |
X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0]; |
| 1354 |
X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1]; |
| 1355 |
} |
| 1356 |
} |
| 1357 |
return 0; |
| 1358 |
} |
| 1359 |
|
| 1360 |
/// High Frequency Generator (14496-3 sp04 p215)
|
| 1361 |
static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr, |
| 1362 |
float X_high[64][40][2], const float X_low[32][40][2], |
| 1363 |
const float (*alpha0)[2], const float (*alpha1)[2], |
| 1364 |
const float bw_array[5], const uint8_t *t_env, |
| 1365 |
int bs_num_env)
|
| 1366 |
{
|
| 1367 |
int i, j, x;
|
| 1368 |
int g = 0; |
| 1369 |
int k = sbr->kx[1]; |
| 1370 |
for (j = 0; j < sbr->num_patches; j++) { |
| 1371 |
for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) { |
| 1372 |
float alpha[4]; |
| 1373 |
const int p = sbr->patch_start_subband[j] + x; |
| 1374 |
while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
|
| 1375 |
g++; |
| 1376 |
g--; |
| 1377 |
|
| 1378 |
if (g < 0) { |
| 1379 |
av_log(ac->avctx, AV_LOG_ERROR, |
| 1380 |
"ERROR : no subband found for frequency %d\n", k);
|
| 1381 |
return -1; |
| 1382 |
} |
| 1383 |
|
| 1384 |
alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g]; |
| 1385 |
alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g]; |
| 1386 |
alpha[2] = alpha0[p][0] * bw_array[g]; |
| 1387 |
alpha[3] = alpha0[p][1] * bw_array[g]; |
| 1388 |
|
| 1389 |
for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) { |
| 1390 |
const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1391 |
X_high[k][idx][0] =
|
| 1392 |
X_low[p][idx - 2][0] * alpha[0] - |
| 1393 |
X_low[p][idx - 2][1] * alpha[1] + |
| 1394 |
X_low[p][idx - 1][0] * alpha[2] - |
| 1395 |
X_low[p][idx - 1][1] * alpha[3] + |
| 1396 |
X_low[p][idx][0];
|
| 1397 |
X_high[k][idx][1] =
|
| 1398 |
X_low[p][idx - 2][1] * alpha[0] + |
| 1399 |
X_low[p][idx - 2][0] * alpha[1] + |
| 1400 |
X_low[p][idx - 1][1] * alpha[2] + |
| 1401 |
X_low[p][idx - 1][0] * alpha[3] + |
| 1402 |
X_low[p][idx][1];
|
| 1403 |
} |
| 1404 |
} |
| 1405 |
} |
| 1406 |
if (k < sbr->m[1] + sbr->kx[1]) |
| 1407 |
memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high)); |
| 1408 |
|
| 1409 |
return 0; |
| 1410 |
} |
| 1411 |
|
| 1412 |
/// Generate the subband filtered lowband
|
| 1413 |
static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64], |
| 1414 |
const float X_low[32][40][2], const float Y[2][38][64][2], |
| 1415 |
int ch)
|
| 1416 |
{
|
| 1417 |
int k, i;
|
| 1418 |
const int i_f = 32; |
| 1419 |
const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0); |
| 1420 |
memset(X, 0, 2*sizeof(*X)); |
| 1421 |
for (k = 0; k < sbr->kx[0]; k++) { |
| 1422 |
for (i = 0; i < i_Temp; i++) { |
| 1423 |
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; |
| 1424 |
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; |
| 1425 |
} |
| 1426 |
} |
| 1427 |
for (; k < sbr->kx[0] + sbr->m[0]; k++) { |
| 1428 |
for (i = 0; i < i_Temp; i++) { |
| 1429 |
X[0][i][k] = Y[0][i + i_f][k][0]; |
| 1430 |
X[1][i][k] = Y[0][i + i_f][k][1]; |
| 1431 |
} |
| 1432 |
} |
| 1433 |
|
| 1434 |
for (k = 0; k < sbr->kx[1]; k++) { |
| 1435 |
for (i = i_Temp; i < 38; i++) { |
| 1436 |
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0]; |
| 1437 |
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1]; |
| 1438 |
} |
| 1439 |
} |
| 1440 |
for (; k < sbr->kx[1] + sbr->m[1]; k++) { |
| 1441 |
for (i = i_Temp; i < i_f; i++) {
|
| 1442 |
X[0][i][k] = Y[1][i][k][0]; |
| 1443 |
X[1][i][k] = Y[1][i][k][1]; |
| 1444 |
} |
| 1445 |
} |
| 1446 |
return 0; |
| 1447 |
} |
| 1448 |
|
| 1449 |
/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
|
| 1450 |
* (14496-3 sp04 p217)
|
| 1451 |
*/
|
| 1452 |
static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr, |
| 1453 |
SBRData *ch_data, int e_a[2]) |
| 1454 |
{
|
| 1455 |
int e, i, m;
|
| 1456 |
|
| 1457 |
memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1])); |
| 1458 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1459 |
const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]]; |
| 1460 |
uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
|
| 1461 |
int k;
|
| 1462 |
|
| 1463 |
for (i = 0; i < ilim; i++) |
| 1464 |
for (m = table[i]; m < table[i + 1]; m++) |
| 1465 |
sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i]; |
| 1466 |
|
| 1467 |
// ch_data->bs_num_noise > 1 => 2 noise floors
|
| 1468 |
k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]); |
| 1469 |
for (i = 0; i < sbr->n_q; i++) |
| 1470 |
for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++) |
| 1471 |
sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i]; |
| 1472 |
|
| 1473 |
for (i = 0; i < sbr->n[1]; i++) { |
| 1474 |
if (ch_data->bs_add_harmonic_flag) {
|
| 1475 |
const unsigned int m_midpoint = |
| 1476 |
(sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1; |
| 1477 |
|
| 1478 |
ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] * |
| 1479 |
(e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1)); |
| 1480 |
} |
| 1481 |
} |
| 1482 |
|
| 1483 |
for (i = 0; i < ilim; i++) { |
| 1484 |
int additional_sinusoid_present = 0; |
| 1485 |
for (m = table[i]; m < table[i + 1]; m++) { |
| 1486 |
if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) { |
| 1487 |
additional_sinusoid_present = 1;
|
| 1488 |
break;
|
| 1489 |
} |
| 1490 |
} |
| 1491 |
memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
|
| 1492 |
(table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0])); |
| 1493 |
} |
| 1494 |
} |
| 1495 |
|
| 1496 |
memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0])); |
| 1497 |
} |
| 1498 |
|
| 1499 |
/// Estimation of current envelope (14496-3 sp04 p218)
|
| 1500 |
static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2], |
| 1501 |
SpectralBandReplication *sbr, SBRData *ch_data) |
| 1502 |
{
|
| 1503 |
int e, i, m;
|
| 1504 |
|
| 1505 |
if (sbr->bs_interpol_freq) {
|
| 1506 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1507 |
const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]); |
| 1508 |
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1509 |
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1510 |
|
| 1511 |
for (m = 0; m < sbr->m[1]; m++) { |
| 1512 |
float sum = 0.0f; |
| 1513 |
|
| 1514 |
for (i = ilb; i < iub; i++) {
|
| 1515 |
sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] + |
| 1516 |
X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1]; |
| 1517 |
} |
| 1518 |
e_curr[e][m] = sum * recip_env_size; |
| 1519 |
} |
| 1520 |
} |
| 1521 |
} else {
|
| 1522 |
int k, p;
|
| 1523 |
|
| 1524 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1525 |
const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]); |
| 1526 |
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1527 |
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET; |
| 1528 |
const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow; |
| 1529 |
|
| 1530 |
for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) { |
| 1531 |
float sum = 0.0f; |
| 1532 |
const int den = env_size * (table[p + 1] - table[p]); |
| 1533 |
|
| 1534 |
for (k = table[p]; k < table[p + 1]; k++) { |
| 1535 |
for (i = ilb; i < iub; i++) {
|
| 1536 |
sum += X_high[k][i][0] * X_high[k][i][0] + |
| 1537 |
X_high[k][i][1] * X_high[k][i][1]; |
| 1538 |
} |
| 1539 |
} |
| 1540 |
sum /= den; |
| 1541 |
for (k = table[p]; k < table[p + 1]; k++) { |
| 1542 |
e_curr[e][k - sbr->kx[1]] = sum;
|
| 1543 |
} |
| 1544 |
} |
| 1545 |
} |
| 1546 |
} |
| 1547 |
} |
| 1548 |
|
| 1549 |
/**
|
| 1550 |
* Calculation of levels of additional HF signal components (14496-3 sp04 p219)
|
| 1551 |
* and Calculation of gain (14496-3 sp04 p219)
|
| 1552 |
*/
|
| 1553 |
static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr, |
| 1554 |
SBRData *ch_data, const int e_a[2]) |
| 1555 |
{
|
| 1556 |
int e, k, m;
|
| 1557 |
// max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
|
| 1558 |
static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 }; |
| 1559 |
|
| 1560 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1561 |
int delta = !((e == e_a[1]) || (e == e_a[0])); |
| 1562 |
for (k = 0; k < sbr->n_lim; k++) { |
| 1563 |
float gain_boost, gain_max;
|
| 1564 |
float sum[2] = { 0.0f, 0.0f }; |
| 1565 |
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1566 |
const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]); |
| 1567 |
sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]); |
| 1568 |
sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
|
| 1569 |
if (!sbr->s_mapped[e][m]) {
|
| 1570 |
sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] / |
| 1571 |
((1.0f + sbr->e_curr[e][m]) * |
| 1572 |
(1.0f + sbr->q_mapped[e][m] * delta))); |
| 1573 |
} else {
|
| 1574 |
sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] / |
| 1575 |
((1.0f + sbr->e_curr[e][m]) * |
| 1576 |
(1.0f + sbr->q_mapped[e][m]))); |
| 1577 |
} |
| 1578 |
} |
| 1579 |
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1580 |
sum[0] += sbr->e_origmapped[e][m];
|
| 1581 |
sum[1] += sbr->e_curr[e][m];
|
| 1582 |
} |
| 1583 |
gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); |
| 1584 |
gain_max = FFMIN(100000, gain_max);
|
| 1585 |
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1586 |
float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
|
| 1587 |
sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max); |
| 1588 |
sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max); |
| 1589 |
} |
| 1590 |
sum[0] = sum[1] = 0.0f; |
| 1591 |
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1592 |
sum[0] += sbr->e_origmapped[e][m];
|
| 1593 |
sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
|
| 1594 |
+ sbr->s_m[e][m] * sbr->s_m[e][m] |
| 1595 |
+ (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m]; |
| 1596 |
} |
| 1597 |
gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1])); |
| 1598 |
gain_boost = FFMIN(1.584893192, gain_boost); |
| 1599 |
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) { |
| 1600 |
sbr->gain[e][m] *= gain_boost; |
| 1601 |
sbr->q_m[e][m] *= gain_boost; |
| 1602 |
sbr->s_m[e][m] *= gain_boost; |
| 1603 |
} |
| 1604 |
} |
| 1605 |
} |
| 1606 |
} |
| 1607 |
|
| 1608 |
/// Assembling HF Signals (14496-3 sp04 p220)
|
| 1609 |
static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2], |
| 1610 |
SpectralBandReplication *sbr, SBRData *ch_data, |
| 1611 |
const int e_a[2]) |
| 1612 |
{
|
| 1613 |
int e, i, j, m;
|
| 1614 |
const int h_SL = 4 * !sbr->bs_smoothing_mode; |
| 1615 |
const int kx = sbr->kx[1]; |
| 1616 |
const int m_max = sbr->m[1]; |
| 1617 |
static const float h_smooth[5] = { |
| 1618 |
0.33333333333333, |
| 1619 |
0.30150283239582, |
| 1620 |
0.21816949906249, |
| 1621 |
0.11516383427084, |
| 1622 |
0.03183050093751, |
| 1623 |
}; |
| 1624 |
static const int8_t phi[2][4] = { |
| 1625 |
{ 1, 0, -1, 0}, // real
|
| 1626 |
{ 0, 1, 0, -1}, // imaginary
|
| 1627 |
}; |
| 1628 |
float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp; |
| 1629 |
int indexnoise = ch_data->f_indexnoise;
|
| 1630 |
int indexsine = ch_data->f_indexsine;
|
| 1631 |
memcpy(Y[0], Y[1], sizeof(Y[0])); |
| 1632 |
|
| 1633 |
if (sbr->reset) {
|
| 1634 |
for (i = 0; i < h_SL; i++) { |
| 1635 |
memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0])); |
| 1636 |
memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0])); |
| 1637 |
} |
| 1638 |
} else if (h_SL) { |
| 1639 |
memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0])); |
| 1640 |
memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0])); |
| 1641 |
} |
| 1642 |
|
| 1643 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1644 |
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { |
| 1645 |
memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0])); |
| 1646 |
memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0])); |
| 1647 |
} |
| 1648 |
} |
| 1649 |
|
| 1650 |
for (e = 0; e < ch_data->bs_num_env; e++) { |
| 1651 |
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) { |
| 1652 |
int phi_sign = (1 - 2*(kx & 1)); |
| 1653 |
|
| 1654 |
if (h_SL && e != e_a[0] && e != e_a[1]) { |
| 1655 |
for (m = 0; m < m_max; m++) { |
| 1656 |
const int idx1 = i + h_SL; |
| 1657 |
float g_filt = 0.0f; |
| 1658 |
for (j = 0; j <= h_SL; j++) |
| 1659 |
g_filt += g_temp[idx1 - j][m] * h_smooth[j]; |
| 1660 |
Y[1][i][m + kx][0] = |
| 1661 |
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
|
| 1662 |
Y[1][i][m + kx][1] = |
| 1663 |
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
|
| 1664 |
} |
| 1665 |
} else {
|
| 1666 |
for (m = 0; m < m_max; m++) { |
| 1667 |
const float g_filt = g_temp[i + h_SL][m]; |
| 1668 |
Y[1][i][m + kx][0] = |
| 1669 |
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
|
| 1670 |
Y[1][i][m + kx][1] = |
| 1671 |
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
|
| 1672 |
} |
| 1673 |
} |
| 1674 |
|
| 1675 |
if (e != e_a[0] && e != e_a[1]) { |
| 1676 |
for (m = 0; m < m_max; m++) { |
| 1677 |
indexnoise = (indexnoise + 1) & 0x1ff; |
| 1678 |
if (sbr->s_m[e][m]) {
|
| 1679 |
Y[1][i][m + kx][0] += |
| 1680 |
sbr->s_m[e][m] * phi[0][indexsine];
|
| 1681 |
Y[1][i][m + kx][1] += |
| 1682 |
sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
|
| 1683 |
} else {
|
| 1684 |
float q_filt;
|
| 1685 |
if (h_SL) {
|
| 1686 |
const int idx1 = i + h_SL; |
| 1687 |
q_filt = 0.0f; |
| 1688 |
for (j = 0; j <= h_SL; j++) |
| 1689 |
q_filt += q_temp[idx1 - j][m] * h_smooth[j]; |
| 1690 |
} else {
|
| 1691 |
q_filt = q_temp[i][m]; |
| 1692 |
} |
| 1693 |
Y[1][i][m + kx][0] += |
| 1694 |
q_filt * sbr_noise_table[indexnoise][0];
|
| 1695 |
Y[1][i][m + kx][1] += |
| 1696 |
q_filt * sbr_noise_table[indexnoise][1];
|
| 1697 |
} |
| 1698 |
phi_sign = -phi_sign; |
| 1699 |
} |
| 1700 |
} else {
|
| 1701 |
indexnoise = (indexnoise + m_max) & 0x1ff;
|
| 1702 |
for (m = 0; m < m_max; m++) { |
| 1703 |
Y[1][i][m + kx][0] += |
| 1704 |
sbr->s_m[e][m] * phi[0][indexsine];
|
| 1705 |
Y[1][i][m + kx][1] += |
| 1706 |
sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
|
| 1707 |
phi_sign = -phi_sign; |
| 1708 |
} |
| 1709 |
} |
| 1710 |
indexsine = (indexsine + 1) & 3; |
| 1711 |
} |
| 1712 |
} |
| 1713 |
ch_data->f_indexnoise = indexnoise; |
| 1714 |
ch_data->f_indexsine = indexsine; |
| 1715 |
} |
| 1716 |
|
| 1717 |
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac, |
| 1718 |
float* L, float* R) |
| 1719 |
{
|
| 1720 |
int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
|
| 1721 |
int ch;
|
| 1722 |
int nch = (id_aac == TYPE_CPE) ? 2 : 1; |
| 1723 |
|
| 1724 |
if (sbr->start) {
|
| 1725 |
sbr_dequant(sbr, id_aac); |
| 1726 |
} |
| 1727 |
for (ch = 0; ch < nch; ch++) { |
| 1728 |
/* decode channel */
|
| 1729 |
sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, ch ? R : L, sbr->data[ch].analysis_filterbank_samples, |
| 1730 |
(float*)sbr->qmf_filter_scratch,
|
| 1731 |
sbr->data[ch].W, 1/(-1024 * ac->sf_scale)); |
| 1732 |
sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W); |
| 1733 |
if (sbr->start) {
|
| 1734 |
sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
|
| 1735 |
sbr_chirp(sbr, &sbr->data[ch]); |
| 1736 |
sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1, |
| 1737 |
sbr->data[ch].bw_array, sbr->data[ch].t_env, |
| 1738 |
sbr->data[ch].bs_num_env); |
| 1739 |
|
| 1740 |
// hf_adj
|
| 1741 |
sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); |
| 1742 |
sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]); |
| 1743 |
sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a); |
| 1744 |
sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch], |
| 1745 |
sbr->data[ch].e_a); |
| 1746 |
} |
| 1747 |
|
| 1748 |
/* synthesis */
|
| 1749 |
sbr_x_gen(sbr, sbr->X[ch], sbr->X_low, sbr->data[ch].Y, ch); |
| 1750 |
} |
| 1751 |
|
| 1752 |
if (ac->m4ac.ps == 1) { |
| 1753 |
if (sbr->ps.start) {
|
| 1754 |
ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]); |
| 1755 |
} else {
|
| 1756 |
memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0])); |
| 1757 |
} |
| 1758 |
nch = 2;
|
| 1759 |
} |
| 1760 |
|
| 1761 |
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, L, sbr->X[0], sbr->qmf_filter_scratch,
|
| 1762 |
sbr->data[0].synthesis_filterbank_samples,
|
| 1763 |
&sbr->data[0].synthesis_filterbank_samples_offset,
|
| 1764 |
downsampled, |
| 1765 |
ac->add_bias, -1024 * ac->sf_scale);
|
| 1766 |
if (nch == 2) |
| 1767 |
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, R, sbr->X[1], sbr->qmf_filter_scratch,
|
| 1768 |
sbr->data[1].synthesis_filterbank_samples,
|
| 1769 |
&sbr->data[1].synthesis_filterbank_samples_offset,
|
| 1770 |
downsampled, |
| 1771 |
ac->add_bias, -1024 * ac->sf_scale);
|
| 1772 |
} |