| /* |
| * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at) |
| * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| |
| #include "libavutil/common.h" |
| #include "libavutil/libm.h" |
| #include "libavutil/samplefmt.h" |
| #include "avresample.h" |
| #include "internal.h" |
| #include "audio_data.h" |
| #include "audio_mix.h" |
| |
| /* channel positions */ |
| #define FRONT_LEFT 0 |
| #define FRONT_RIGHT 1 |
| #define FRONT_CENTER 2 |
| #define LOW_FREQUENCY 3 |
| #define BACK_LEFT 4 |
| #define BACK_RIGHT 5 |
| #define FRONT_LEFT_OF_CENTER 6 |
| #define FRONT_RIGHT_OF_CENTER 7 |
| #define BACK_CENTER 8 |
| #define SIDE_LEFT 9 |
| #define SIDE_RIGHT 10 |
| #define TOP_CENTER 11 |
| #define TOP_FRONT_LEFT 12 |
| #define TOP_FRONT_CENTER 13 |
| #define TOP_FRONT_RIGHT 14 |
| #define TOP_BACK_LEFT 15 |
| #define TOP_BACK_CENTER 16 |
| #define TOP_BACK_RIGHT 17 |
| #define STEREO_LEFT 29 |
| #define STEREO_RIGHT 30 |
| #define WIDE_LEFT 31 |
| #define WIDE_RIGHT 32 |
| #define SURROUND_DIRECT_LEFT 33 |
| #define SURROUND_DIRECT_RIGHT 34 |
| #define LOW_FREQUENCY_2 35 |
| |
| #define SQRT3_2 1.22474487139158904909 /* sqrt(3/2) */ |
| |
| static av_always_inline int even(uint64_t layout) |
| { |
| return (!layout || !!(layout & (layout - 1))); |
| } |
| |
| static int sane_layout(uint64_t layout) |
| { |
| /* check that there is at least 1 front speaker */ |
| if (!(layout & AV_CH_LAYOUT_SURROUND)) |
| return 0; |
| |
| /* check for left/right symmetry */ |
| if (!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT)) || |
| !even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)) || |
| !even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)) || |
| !even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)) || |
| !even(layout & (AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT)) || |
| !even(layout & (AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT)) || |
| !even(layout & (AV_CH_STEREO_LEFT | AV_CH_STEREO_RIGHT)) || |
| !even(layout & (AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT)) || |
| !even(layout & (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT))) |
| return 0; |
| |
| return 1; |
| } |
| |
| int avresample_build_matrix(uint64_t in_layout, uint64_t out_layout, |
| double center_mix_level, double surround_mix_level, |
| double lfe_mix_level, int normalize, |
| double *matrix_out, int stride, |
| enum AVMatrixEncoding matrix_encoding) |
| { |
| int i, j, out_i, out_j; |
| double matrix[64][64] = {{0}}; |
| int64_t unaccounted; |
| double maxcoef = 0; |
| int in_channels, out_channels; |
| |
| if ((out_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == AV_CH_LAYOUT_STEREO_DOWNMIX) { |
| out_layout = AV_CH_LAYOUT_STEREO; |
| } |
| |
| unaccounted = in_layout & ~out_layout; |
| |
| in_channels = av_get_channel_layout_nb_channels( in_layout); |
| out_channels = av_get_channel_layout_nb_channels(out_layout); |
| |
| memset(matrix_out, 0, out_channels * stride * sizeof(*matrix_out)); |
| |
| /* check if layouts are supported */ |
| if (!in_layout || in_channels > AVRESAMPLE_MAX_CHANNELS) |
| return AVERROR(EINVAL); |
| if (!out_layout || out_channels > AVRESAMPLE_MAX_CHANNELS) |
| return AVERROR(EINVAL); |
| |
| /* check if layouts are unbalanced or abnormal */ |
| if (!sane_layout(in_layout) || !sane_layout(out_layout)) |
| return AVERROR_PATCHWELCOME; |
| |
| /* route matching input/output channels */ |
| for (i = 0; i < 64; i++) { |
| if (in_layout & out_layout & (1ULL << i)) |
| matrix[i][i] = 1.0; |
| } |
| |
| /* mix front center to front left/right */ |
| if (unaccounted & AV_CH_FRONT_CENTER) { |
| if ((out_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) { |
| if ((in_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) { |
| matrix[FRONT_LEFT ][FRONT_CENTER] += center_mix_level; |
| matrix[FRONT_RIGHT][FRONT_CENTER] += center_mix_level; |
| } else { |
| matrix[FRONT_LEFT ][FRONT_CENTER] += M_SQRT1_2; |
| matrix[FRONT_RIGHT][FRONT_CENTER] += M_SQRT1_2; |
| } |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix front left/right to center */ |
| if (unaccounted & AV_CH_LAYOUT_STEREO) { |
| if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][FRONT_LEFT ] += M_SQRT1_2; |
| matrix[FRONT_CENTER][FRONT_RIGHT] += M_SQRT1_2; |
| /* mix left/right/center to center */ |
| if (in_layout & AV_CH_FRONT_CENTER) |
| matrix[FRONT_CENTER][FRONT_CENTER] = center_mix_level * M_SQRT2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix back center to back, side, or front */ |
| if (unaccounted & AV_CH_BACK_CENTER) { |
| if (out_layout & AV_CH_BACK_LEFT) { |
| matrix[BACK_LEFT ][BACK_CENTER] += M_SQRT1_2; |
| matrix[BACK_RIGHT][BACK_CENTER] += M_SQRT1_2; |
| } else if (out_layout & AV_CH_SIDE_LEFT) { |
| matrix[SIDE_LEFT ][BACK_CENTER] += M_SQRT1_2; |
| matrix[SIDE_RIGHT][BACK_CENTER] += M_SQRT1_2; |
| } else if (out_layout & AV_CH_FRONT_LEFT) { |
| if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY || |
| matrix_encoding == AV_MATRIX_ENCODING_DPLII) { |
| if (unaccounted & (AV_CH_BACK_LEFT | AV_CH_SIDE_LEFT)) { |
| matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2; |
| } else { |
| matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level; |
| matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level; |
| } |
| } else { |
| matrix[FRONT_LEFT ][BACK_CENTER] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2; |
| } |
| } else if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][BACK_CENTER] += surround_mix_level * M_SQRT1_2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix back left/right to back center, side, or front */ |
| if (unaccounted & AV_CH_BACK_LEFT) { |
| if (out_layout & AV_CH_BACK_CENTER) { |
| matrix[BACK_CENTER][BACK_LEFT ] += M_SQRT1_2; |
| matrix[BACK_CENTER][BACK_RIGHT] += M_SQRT1_2; |
| } else if (out_layout & AV_CH_SIDE_LEFT) { |
| /* if side channels do not exist in the input, just copy back |
| channels to side channels, otherwise mix back into side */ |
| if (in_layout & AV_CH_SIDE_LEFT) { |
| matrix[SIDE_LEFT ][BACK_LEFT ] += M_SQRT1_2; |
| matrix[SIDE_RIGHT][BACK_RIGHT] += M_SQRT1_2; |
| } else { |
| matrix[SIDE_LEFT ][BACK_LEFT ] += 1.0; |
| matrix[SIDE_RIGHT][BACK_RIGHT] += 1.0; |
| } |
| } else if (out_layout & AV_CH_FRONT_LEFT) { |
| if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) { |
| matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * M_SQRT1_2; |
| } else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) { |
| matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * SQRT3_2; |
| matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * SQRT3_2; |
| } else { |
| matrix[FRONT_LEFT ][BACK_LEFT ] += surround_mix_level; |
| matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level; |
| } |
| } else if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][BACK_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_CENTER][BACK_RIGHT] += surround_mix_level * M_SQRT1_2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix side left/right into back or front */ |
| if (unaccounted & AV_CH_SIDE_LEFT) { |
| if (out_layout & AV_CH_BACK_LEFT) { |
| /* if back channels do not exist in the input, just copy side |
| channels to back channels, otherwise mix side into back */ |
| if (in_layout & AV_CH_BACK_LEFT) { |
| matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2; |
| matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2; |
| } else { |
| matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0; |
| matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0; |
| } |
| } else if (out_layout & AV_CH_BACK_CENTER) { |
| matrix[BACK_CENTER][SIDE_LEFT ] += M_SQRT1_2; |
| matrix[BACK_CENTER][SIDE_RIGHT] += M_SQRT1_2; |
| } else if (out_layout & AV_CH_FRONT_LEFT) { |
| if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) { |
| matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2; |
| } else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) { |
| matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * SQRT3_2; |
| matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * SQRT3_2; |
| } else { |
| matrix[FRONT_LEFT ][SIDE_LEFT ] += surround_mix_level; |
| matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level; |
| } |
| } else if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2; |
| matrix[FRONT_CENTER][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix left-of-center/right-of-center into front left/right or center */ |
| if (unaccounted & AV_CH_FRONT_LEFT_OF_CENTER) { |
| if (out_layout & AV_CH_FRONT_LEFT) { |
| matrix[FRONT_LEFT ][FRONT_LEFT_OF_CENTER ] += 1.0; |
| matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER] += 1.0; |
| } else if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][FRONT_LEFT_OF_CENTER ] += M_SQRT1_2; |
| matrix[FRONT_CENTER][FRONT_RIGHT_OF_CENTER] += M_SQRT1_2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| /* mix LFE into front left/right or center */ |
| if (unaccounted & AV_CH_LOW_FREQUENCY) { |
| if (out_layout & AV_CH_FRONT_CENTER) { |
| matrix[FRONT_CENTER][LOW_FREQUENCY] += lfe_mix_level; |
| } else if (out_layout & AV_CH_FRONT_LEFT) { |
| matrix[FRONT_LEFT ][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2; |
| matrix[FRONT_RIGHT][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2; |
| } else |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| /* transfer internal matrix to output matrix and calculate maximum |
| per-channel coefficient sum */ |
| for (out_i = i = 0; out_i < out_channels && i < 64; i++) { |
| double sum = 0; |
| for (out_j = j = 0; out_j < in_channels && j < 64; j++) { |
| matrix_out[out_i * stride + out_j] = matrix[i][j]; |
| sum += fabs(matrix[i][j]); |
| if (in_layout & (1ULL << j)) |
| out_j++; |
| } |
| maxcoef = FFMAX(maxcoef, sum); |
| if (out_layout & (1ULL << i)) |
| out_i++; |
| } |
| |
| /* normalize */ |
| if (normalize && maxcoef > 1.0) { |
| for (i = 0; i < out_channels; i++) |
| for (j = 0; j < in_channels; j++) |
| matrix_out[i * stride + j] /= maxcoef; |
| } |
| |
| return 0; |
| } |
