audio_mix_matrix.c 12.7 KB
Newer Older
Justin Ruggles's avatar
Justin Ruggles committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/*
 * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
 * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>

24
#include "libavutil/common.h"
Justin Ruggles's avatar
Justin Ruggles committed
25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
#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
57
#define LOW_FREQUENCY_2        35
Justin Ruggles's avatar
Justin Ruggles committed
58

59 60
#define SQRT3_2      1.22474487139158904909  /* sqrt(3/2) */

Justin Ruggles's avatar
Justin Ruggles committed
61 62
static av_always_inline int even(uint64_t layout)
{
63
    return (!layout || !!(layout & (layout - 1)));
Justin Ruggles's avatar
Justin Ruggles committed
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
}

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,
90 91
                            double *matrix_out, int stride,
                            enum AVMatrixEncoding matrix_encoding)
Justin Ruggles's avatar
Justin Ruggles committed
92 93 94
{
    int i, j, out_i, out_j;
    double matrix[64][64] = {{0}};
95
    int64_t unaccounted;
Justin Ruggles's avatar
Justin Ruggles committed
96 97 98
    double maxcoef = 0;
    int in_channels, out_channels;

99 100 101 102 103 104
    if ((out_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == AV_CH_LAYOUT_STEREO_DOWNMIX) {
        out_layout = AV_CH_LAYOUT_STEREO;
    }

    unaccounted = in_layout & ~out_layout;

Justin Ruggles's avatar
Justin Ruggles committed
105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
    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) {
129 130 131 132 133 134 135
            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;
            }
Justin Ruggles's avatar
Justin Ruggles committed
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
        } 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) {
159 160 161 162 163 164 165 166 167 168 169 170 171
            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;
            }
Justin Ruggles's avatar
Justin Ruggles committed
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
        } 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) {
193 194 195 196 197 198 199 200 201 202 203 204 205 206
            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;
            }
Justin Ruggles's avatar
Justin Ruggles committed
207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
        } 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) {
229 230 231 232 233 234 235 236 237 238 239 240 241 242
            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;
            }
Justin Ruggles's avatar
Justin Ruggles committed
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294
        } 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;
}