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https://github.com/librempeg/librempeg
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b08f554fdc
* commit '76a75c523cd3c63560185394a0a5cd7249db962a': lavr: mix front center channel as indicated in the ATSC A/52 specification. Merged-by: Michael Niedermayer <michaelni@gmx.at>
295 lines
13 KiB
C
295 lines
13 KiB
C
/*
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* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
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* Copyright (c) 2012 Justin Ruggles <justin.ruggles@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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#include <stdint.h>
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#include "libavutil/common.h"
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#include "libavutil/libm.h"
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#include "libavutil/samplefmt.h"
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#include "avresample.h"
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#include "internal.h"
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#include "audio_data.h"
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#include "audio_mix.h"
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/* channel positions */
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#define FRONT_LEFT 0
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#define FRONT_RIGHT 1
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#define FRONT_CENTER 2
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#define LOW_FREQUENCY 3
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#define BACK_LEFT 4
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#define BACK_RIGHT 5
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#define FRONT_LEFT_OF_CENTER 6
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#define FRONT_RIGHT_OF_CENTER 7
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#define BACK_CENTER 8
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#define SIDE_LEFT 9
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#define SIDE_RIGHT 10
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#define TOP_CENTER 11
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#define TOP_FRONT_LEFT 12
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#define TOP_FRONT_CENTER 13
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#define TOP_FRONT_RIGHT 14
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#define TOP_BACK_LEFT 15
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#define TOP_BACK_CENTER 16
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#define TOP_BACK_RIGHT 17
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#define STEREO_LEFT 29
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#define STEREO_RIGHT 30
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#define WIDE_LEFT 31
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#define WIDE_RIGHT 32
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#define SURROUND_DIRECT_LEFT 33
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#define SURROUND_DIRECT_RIGHT 34
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#define LOW_FREQUENCY_2 35
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#define SQRT3_2 1.22474487139158904909 /* sqrt(3/2) */
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static av_always_inline int even(uint64_t layout)
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{
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return (!layout || (layout & (layout - 1)));
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}
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static int sane_layout(uint64_t layout)
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{
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/* check that there is at least 1 front speaker */
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if (!(layout & AV_CH_LAYOUT_SURROUND))
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return 0;
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/* check for left/right symmetry */
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if (!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT)) ||
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!even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)) ||
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!even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)) ||
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!even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)) ||
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!even(layout & (AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT)) ||
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!even(layout & (AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT)) ||
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!even(layout & (AV_CH_STEREO_LEFT | AV_CH_STEREO_RIGHT)) ||
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!even(layout & (AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT)) ||
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!even(layout & (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)))
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return 0;
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return 1;
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}
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int avresample_build_matrix(uint64_t in_layout, uint64_t out_layout,
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double center_mix_level, double surround_mix_level,
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double lfe_mix_level, int normalize,
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double *matrix_out, int stride,
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enum AVMatrixEncoding matrix_encoding)
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{
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int i, j, out_i, out_j;
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double matrix[64][64] = {{0}};
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int64_t unaccounted;
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double maxcoef = 0;
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int in_channels, out_channels;
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if ((out_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == AV_CH_LAYOUT_STEREO_DOWNMIX) {
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out_layout = AV_CH_LAYOUT_STEREO;
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}
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unaccounted = in_layout & ~out_layout;
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in_channels = av_get_channel_layout_nb_channels( in_layout);
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out_channels = av_get_channel_layout_nb_channels(out_layout);
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memset(matrix_out, 0, out_channels * stride * sizeof(*matrix_out));
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/* check if layouts are supported */
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if (!in_layout || in_channels > AVRESAMPLE_MAX_CHANNELS)
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return AVERROR(EINVAL);
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if (!out_layout || out_channels > AVRESAMPLE_MAX_CHANNELS)
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return AVERROR(EINVAL);
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/* check if layouts are unbalanced or abnormal */
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if (!sane_layout(in_layout) || !sane_layout(out_layout))
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return AVERROR_PATCHWELCOME;
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/* route matching input/output channels */
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for (i = 0; i < 64; i++) {
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if (in_layout & out_layout & (1ULL << i))
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matrix[i][i] = 1.0;
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}
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/* mix front center to front left/right */
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if (unaccounted & AV_CH_FRONT_CENTER) {
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if ((out_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) {
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if ((in_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) {
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matrix[FRONT_LEFT ][FRONT_CENTER] += center_mix_level;
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matrix[FRONT_RIGHT][FRONT_CENTER] += center_mix_level;
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} else {
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matrix[FRONT_LEFT ][FRONT_CENTER] += M_SQRT1_2;
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matrix[FRONT_RIGHT][FRONT_CENTER] += M_SQRT1_2;
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}
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix front left/right to center */
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if (unaccounted & AV_CH_LAYOUT_STEREO) {
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if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][FRONT_LEFT ] += M_SQRT1_2;
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matrix[FRONT_CENTER][FRONT_RIGHT] += M_SQRT1_2;
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/* mix left/right/center to center */
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if (in_layout & AV_CH_FRONT_CENTER)
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matrix[FRONT_CENTER][FRONT_CENTER] = center_mix_level * M_SQRT2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix back center to back, side, or front */
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if (unaccounted & AV_CH_BACK_CENTER) {
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if (out_layout & AV_CH_BACK_LEFT) {
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matrix[BACK_LEFT ][BACK_CENTER] += M_SQRT1_2;
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matrix[BACK_RIGHT][BACK_CENTER] += M_SQRT1_2;
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} else if (out_layout & AV_CH_SIDE_LEFT) {
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matrix[SIDE_LEFT ][BACK_CENTER] += M_SQRT1_2;
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matrix[SIDE_RIGHT][BACK_CENTER] += M_SQRT1_2;
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} else if (out_layout & AV_CH_FRONT_LEFT) {
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if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY ||
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matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
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if (unaccounted & (AV_CH_BACK_LEFT | AV_CH_SIDE_LEFT)) {
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matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
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} else {
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matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level;
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matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level;
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}
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} else {
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matrix[FRONT_LEFT ][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
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}
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} else if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix back left/right to back center, side, or front */
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if (unaccounted & AV_CH_BACK_LEFT) {
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if (out_layout & AV_CH_BACK_CENTER) {
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matrix[BACK_CENTER][BACK_LEFT ] += M_SQRT1_2;
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matrix[BACK_CENTER][BACK_RIGHT] += M_SQRT1_2;
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} else if (out_layout & AV_CH_SIDE_LEFT) {
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/* if side channels do not exist in the input, just copy back
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channels to side channels, otherwise mix back into side */
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if (in_layout & AV_CH_SIDE_LEFT) {
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matrix[SIDE_LEFT ][BACK_LEFT ] += M_SQRT1_2;
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matrix[SIDE_RIGHT][BACK_RIGHT] += M_SQRT1_2;
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} else {
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matrix[SIDE_LEFT ][BACK_LEFT ] += 1.0;
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matrix[SIDE_RIGHT][BACK_RIGHT] += 1.0;
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}
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} else if (out_layout & AV_CH_FRONT_LEFT) {
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if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
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matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * M_SQRT1_2;
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} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
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matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * SQRT3_2;
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matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * SQRT3_2;
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} else {
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matrix[FRONT_LEFT ][BACK_LEFT ] += surround_mix_level;
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matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level;
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}
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} else if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_CENTER][BACK_RIGHT] += surround_mix_level * M_SQRT1_2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix side left/right into back or front */
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if (unaccounted & AV_CH_SIDE_LEFT) {
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if (out_layout & AV_CH_BACK_LEFT) {
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/* if back channels do not exist in the input, just copy side
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channels to back channels, otherwise mix side into back */
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if (in_layout & AV_CH_BACK_LEFT) {
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matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2;
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matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2;
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} else {
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matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0;
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matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0;
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}
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} else if (out_layout & AV_CH_BACK_CENTER) {
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matrix[BACK_CENTER][SIDE_LEFT ] += M_SQRT1_2;
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matrix[BACK_CENTER][SIDE_RIGHT] += M_SQRT1_2;
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} else if (out_layout & AV_CH_FRONT_LEFT) {
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if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
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matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2;
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} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
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matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * SQRT3_2;
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matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * SQRT3_2;
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} else {
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matrix[FRONT_LEFT ][SIDE_LEFT ] += surround_mix_level;
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matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level;
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}
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} else if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
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matrix[FRONT_CENTER][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix left-of-center/right-of-center into front left/right or center */
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if (unaccounted & AV_CH_FRONT_LEFT_OF_CENTER) {
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if (out_layout & AV_CH_FRONT_LEFT) {
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matrix[FRONT_LEFT ][FRONT_LEFT_OF_CENTER ] += 1.0;
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matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER] += 1.0;
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} else if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][FRONT_LEFT_OF_CENTER ] += M_SQRT1_2;
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matrix[FRONT_CENTER][FRONT_RIGHT_OF_CENTER] += M_SQRT1_2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* mix LFE into front left/right or center */
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if (unaccounted & AV_CH_LOW_FREQUENCY) {
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if (out_layout & AV_CH_FRONT_CENTER) {
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matrix[FRONT_CENTER][LOW_FREQUENCY] += lfe_mix_level;
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} else if (out_layout & AV_CH_FRONT_LEFT) {
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matrix[FRONT_LEFT ][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
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matrix[FRONT_RIGHT][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
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} else
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return AVERROR_PATCHWELCOME;
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}
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/* transfer internal matrix to output matrix and calculate maximum
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per-channel coefficient sum */
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for (out_i = i = 0; out_i < out_channels && i < 64; i++) {
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double sum = 0;
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for (out_j = j = 0; out_j < in_channels && j < 64; j++) {
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matrix_out[out_i * stride + out_j] = matrix[i][j];
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sum += fabs(matrix[i][j]);
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if (in_layout & (1ULL << j))
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out_j++;
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}
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maxcoef = FFMAX(maxcoef, sum);
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if (out_layout & (1ULL << i))
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out_i++;
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}
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/* normalize */
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if (normalize && maxcoef > 1.0) {
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for (i = 0; i < out_channels; i++)
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for (j = 0; j < in_channels; j++)
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matrix_out[i * stride + j] /= maxcoef;
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}
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return 0;
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}
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