| 1 | /* |
| 2 | * The simplest AC-3 encoder |
| 3 | * Copyright (c) 2000 Fabrice Bellard |
| 4 | * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> |
| 5 | * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @file |
| 26 | * The simplest AC-3 encoder. |
| 27 | */ |
| 28 | |
| 29 | #include <stdint.h> |
| 30 | |
| 31 | #include "libavutil/attributes.h" |
| 32 | #include "libavutil/avassert.h" |
| 33 | #include "libavutil/avstring.h" |
| 34 | #include "libavutil/channel_layout.h" |
| 35 | #include "libavutil/crc.h" |
| 36 | #include "libavutil/internal.h" |
| 37 | #include "libavutil/opt.h" |
| 38 | #include "avcodec.h" |
| 39 | #include "me_cmp.h" |
| 40 | #include "put_bits.h" |
| 41 | #include "audiodsp.h" |
| 42 | #include "ac3dsp.h" |
| 43 | #include "ac3.h" |
| 44 | #include "fft.h" |
| 45 | #include "ac3enc.h" |
| 46 | #include "eac3enc.h" |
| 47 | |
| 48 | typedef struct AC3Mant { |
| 49 | int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 |
| 50 | int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4 |
| 51 | } AC3Mant; |
| 52 | |
| 53 | #define CMIXLEV_NUM_OPTIONS 3 |
| 54 | static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = { |
| 55 | LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB |
| 56 | }; |
| 57 | |
| 58 | #define SURMIXLEV_NUM_OPTIONS 3 |
| 59 | static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = { |
| 60 | LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO |
| 61 | }; |
| 62 | |
| 63 | #define EXTMIXLEV_NUM_OPTIONS 8 |
| 64 | static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = { |
| 65 | LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB, |
| 66 | LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO |
| 67 | }; |
| 68 | |
| 69 | |
| 70 | /** |
| 71 | * LUT for number of exponent groups. |
| 72 | * exponent_group_tab[coupling][exponent strategy-1][number of coefficients] |
| 73 | */ |
| 74 | static uint8_t exponent_group_tab[2][3][256]; |
| 75 | |
| 76 | |
| 77 | /** |
| 78 | * List of supported channel layouts. |
| 79 | */ |
| 80 | const uint64_t ff_ac3_channel_layouts[19] = { |
| 81 | AV_CH_LAYOUT_MONO, |
| 82 | AV_CH_LAYOUT_STEREO, |
| 83 | AV_CH_LAYOUT_2_1, |
| 84 | AV_CH_LAYOUT_SURROUND, |
| 85 | AV_CH_LAYOUT_2_2, |
| 86 | AV_CH_LAYOUT_QUAD, |
| 87 | AV_CH_LAYOUT_4POINT0, |
| 88 | AV_CH_LAYOUT_5POINT0, |
| 89 | AV_CH_LAYOUT_5POINT0_BACK, |
| 90 | (AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY), |
| 91 | (AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY), |
| 92 | (AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY), |
| 93 | (AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY), |
| 94 | (AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY), |
| 95 | (AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY), |
| 96 | (AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY), |
| 97 | AV_CH_LAYOUT_5POINT1, |
| 98 | AV_CH_LAYOUT_5POINT1_BACK, |
| 99 | 0 |
| 100 | }; |
| 101 | |
| 102 | |
| 103 | /** |
| 104 | * LUT to select the bandwidth code based on the bit rate, sample rate, and |
| 105 | * number of full-bandwidth channels. |
| 106 | * bandwidth_tab[fbw_channels-1][sample rate code][bit rate code] |
| 107 | */ |
| 108 | static const uint8_t ac3_bandwidth_tab[5][3][19] = { |
| 109 | // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 |
| 110 | |
| 111 | { { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, |
| 112 | { 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, |
| 113 | { 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, |
| 114 | |
| 115 | { { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 }, |
| 116 | { 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 }, |
| 117 | { 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } }, |
| 118 | |
| 119 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 }, |
| 120 | { 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 }, |
| 121 | { 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } }, |
| 122 | |
| 123 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 }, |
| 124 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 }, |
| 125 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } }, |
| 126 | |
| 127 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 }, |
| 128 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 }, |
| 129 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } } |
| 130 | }; |
| 131 | |
| 132 | |
| 133 | /** |
| 134 | * LUT to select the coupling start band based on the bit rate, sample rate, and |
| 135 | * number of full-bandwidth channels. -1 = coupling off |
| 136 | * ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code] |
| 137 | * |
| 138 | * TODO: more testing for optimal parameters. |
| 139 | * multi-channel tests at 44.1kHz and 32kHz. |
| 140 | */ |
| 141 | static const int8_t ac3_coupling_start_tab[6][3][19] = { |
| 142 | // 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640 |
| 143 | |
| 144 | // 2/0 |
| 145 | { { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 }, |
| 146 | { 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 }, |
| 147 | { 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 148 | |
| 149 | // 3/0 |
| 150 | { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, |
| 151 | { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, |
| 152 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 153 | |
| 154 | // 2/1 - untested |
| 155 | { { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, |
| 156 | { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 }, |
| 157 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 158 | |
| 159 | // 3/1 |
| 160 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, |
| 161 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, |
| 162 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 163 | |
| 164 | // 2/2 - untested |
| 165 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, |
| 166 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 }, |
| 167 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 168 | |
| 169 | // 3/2 |
| 170 | { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, |
| 171 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 }, |
| 172 | { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } }, |
| 173 | }; |
| 174 | |
| 175 | |
| 176 | /** |
| 177 | * Adjust the frame size to make the average bit rate match the target bit rate. |
| 178 | * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3. |
| 179 | * |
| 180 | * @param s AC-3 encoder private context |
| 181 | */ |
| 182 | void ff_ac3_adjust_frame_size(AC3EncodeContext *s) |
| 183 | { |
| 184 | while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) { |
| 185 | s->bits_written -= s->bit_rate; |
| 186 | s->samples_written -= s->sample_rate; |
| 187 | } |
| 188 | s->frame_size = s->frame_size_min + |
| 189 | 2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate); |
| 190 | s->bits_written += s->frame_size * 8; |
| 191 | s->samples_written += AC3_BLOCK_SIZE * s->num_blocks; |
| 192 | } |
| 193 | |
| 194 | |
| 195 | /** |
| 196 | * Set the initial coupling strategy parameters prior to coupling analysis. |
| 197 | * |
| 198 | * @param s AC-3 encoder private context |
| 199 | */ |
| 200 | void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s) |
| 201 | { |
| 202 | int blk, ch; |
| 203 | int got_cpl_snr; |
| 204 | int num_cpl_blocks; |
| 205 | |
| 206 | /* set coupling use flags for each block/channel */ |
| 207 | /* TODO: turn coupling on/off and adjust start band based on bit usage */ |
| 208 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 209 | AC3Block *block = &s->blocks[blk]; |
| 210 | for (ch = 1; ch <= s->fbw_channels; ch++) |
| 211 | block->channel_in_cpl[ch] = s->cpl_on; |
| 212 | } |
| 213 | |
| 214 | /* enable coupling for each block if at least 2 channels have coupling |
| 215 | enabled for that block */ |
| 216 | got_cpl_snr = 0; |
| 217 | num_cpl_blocks = 0; |
| 218 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 219 | AC3Block *block = &s->blocks[blk]; |
| 220 | block->num_cpl_channels = 0; |
| 221 | for (ch = 1; ch <= s->fbw_channels; ch++) |
| 222 | block->num_cpl_channels += block->channel_in_cpl[ch]; |
| 223 | block->cpl_in_use = block->num_cpl_channels > 1; |
| 224 | num_cpl_blocks += block->cpl_in_use; |
| 225 | if (!block->cpl_in_use) { |
| 226 | block->num_cpl_channels = 0; |
| 227 | for (ch = 1; ch <= s->fbw_channels; ch++) |
| 228 | block->channel_in_cpl[ch] = 0; |
| 229 | } |
| 230 | |
| 231 | block->new_cpl_strategy = !blk; |
| 232 | if (blk) { |
| 233 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 234 | if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { |
| 235 | block->new_cpl_strategy = 1; |
| 236 | break; |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | block->new_cpl_leak = block->new_cpl_strategy; |
| 241 | |
| 242 | if (!blk || (block->cpl_in_use && !got_cpl_snr)) { |
| 243 | block->new_snr_offsets = 1; |
| 244 | if (block->cpl_in_use) |
| 245 | got_cpl_snr = 1; |
| 246 | } else { |
| 247 | block->new_snr_offsets = 0; |
| 248 | } |
| 249 | } |
| 250 | if (!num_cpl_blocks) |
| 251 | s->cpl_on = 0; |
| 252 | |
| 253 | /* set bandwidth for each channel */ |
| 254 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 255 | AC3Block *block = &s->blocks[blk]; |
| 256 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 257 | if (block->channel_in_cpl[ch]) |
| 258 | block->end_freq[ch] = s->start_freq[CPL_CH]; |
| 259 | else |
| 260 | block->end_freq[ch] = s->bandwidth_code * 3 + 73; |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | |
| 266 | /** |
| 267 | * Apply stereo rematrixing to coefficients based on rematrixing flags. |
| 268 | * |
| 269 | * @param s AC-3 encoder private context |
| 270 | */ |
| 271 | void ff_ac3_apply_rematrixing(AC3EncodeContext *s) |
| 272 | { |
| 273 | int nb_coefs; |
| 274 | int blk, bnd, i; |
| 275 | int start, end; |
| 276 | uint8_t *flags = NULL; |
| 277 | |
| 278 | if (!s->rematrixing_enabled) |
| 279 | return; |
| 280 | |
| 281 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 282 | AC3Block *block = &s->blocks[blk]; |
| 283 | if (block->new_rematrixing_strategy) |
| 284 | flags = block->rematrixing_flags; |
| 285 | nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]); |
| 286 | for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) { |
| 287 | if (flags[bnd]) { |
| 288 | start = ff_ac3_rematrix_band_tab[bnd]; |
| 289 | end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]); |
| 290 | for (i = start; i < end; i++) { |
| 291 | int32_t lt = block->fixed_coef[1][i]; |
| 292 | int32_t rt = block->fixed_coef[2][i]; |
| 293 | block->fixed_coef[1][i] = (lt + rt) >> 1; |
| 294 | block->fixed_coef[2][i] = (lt - rt) >> 1; |
| 295 | } |
| 296 | } |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | |
| 302 | /* |
| 303 | * Initialize exponent tables. |
| 304 | */ |
| 305 | static av_cold void exponent_init(AC3EncodeContext *s) |
| 306 | { |
| 307 | int expstr, i, grpsize; |
| 308 | |
| 309 | for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { |
| 310 | grpsize = 3 << expstr; |
| 311 | for (i = 12; i < 256; i++) { |
| 312 | exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize; |
| 313 | exponent_group_tab[1][expstr][i] = (i ) / grpsize; |
| 314 | } |
| 315 | } |
| 316 | /* LFE */ |
| 317 | exponent_group_tab[0][0][7] = 2; |
| 318 | |
| 319 | if (CONFIG_EAC3_ENCODER && s->eac3) |
| 320 | ff_eac3_exponent_init(); |
| 321 | } |
| 322 | |
| 323 | |
| 324 | /* |
| 325 | * Extract exponents from the MDCT coefficients. |
| 326 | */ |
| 327 | static void extract_exponents(AC3EncodeContext *s) |
| 328 | { |
| 329 | int ch = !s->cpl_on; |
| 330 | int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1); |
| 331 | AC3Block *block = &s->blocks[0]; |
| 332 | |
| 333 | s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size); |
| 334 | } |
| 335 | |
| 336 | |
| 337 | /** |
| 338 | * Exponent Difference Threshold. |
| 339 | * New exponents are sent if their SAD exceed this number. |
| 340 | */ |
| 341 | #define EXP_DIFF_THRESHOLD 500 |
| 342 | |
| 343 | /** |
| 344 | * Table used to select exponent strategy based on exponent reuse block interval. |
| 345 | */ |
| 346 | static const uint8_t exp_strategy_reuse_tab[4][6] = { |
| 347 | { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, |
| 348 | { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, |
| 349 | { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 }, |
| 350 | { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 } |
| 351 | }; |
| 352 | |
| 353 | /* |
| 354 | * Calculate exponent strategies for all channels. |
| 355 | * Array arrangement is reversed to simplify the per-channel calculation. |
| 356 | */ |
| 357 | static void compute_exp_strategy(AC3EncodeContext *s) |
| 358 | { |
| 359 | int ch, blk, blk1; |
| 360 | |
| 361 | for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) { |
| 362 | uint8_t *exp_strategy = s->exp_strategy[ch]; |
| 363 | uint8_t *exp = s->blocks[0].exp[ch]; |
| 364 | int exp_diff; |
| 365 | |
| 366 | /* estimate if the exponent variation & decide if they should be |
| 367 | reused in the next frame */ |
| 368 | exp_strategy[0] = EXP_NEW; |
| 369 | exp += AC3_MAX_COEFS; |
| 370 | for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) { |
| 371 | if (ch == CPL_CH) { |
| 372 | if (!s->blocks[blk-1].cpl_in_use) { |
| 373 | exp_strategy[blk] = EXP_NEW; |
| 374 | continue; |
| 375 | } else if (!s->blocks[blk].cpl_in_use) { |
| 376 | exp_strategy[blk] = EXP_REUSE; |
| 377 | continue; |
| 378 | } |
| 379 | } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) { |
| 380 | exp_strategy[blk] = EXP_NEW; |
| 381 | continue; |
| 382 | } |
| 383 | exp_diff = s->mecc.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16); |
| 384 | exp_strategy[blk] = EXP_REUSE; |
| 385 | if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS)) |
| 386 | exp_strategy[blk] = EXP_NEW; |
| 387 | else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD) |
| 388 | exp_strategy[blk] = EXP_NEW; |
| 389 | } |
| 390 | |
| 391 | /* now select the encoding strategy type : if exponents are often |
| 392 | recoded, we use a coarse encoding */ |
| 393 | blk = 0; |
| 394 | while (blk < s->num_blocks) { |
| 395 | blk1 = blk + 1; |
| 396 | while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) |
| 397 | blk1++; |
| 398 | exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1]; |
| 399 | blk = blk1; |
| 400 | } |
| 401 | } |
| 402 | if (s->lfe_on) { |
| 403 | ch = s->lfe_channel; |
| 404 | s->exp_strategy[ch][0] = EXP_D15; |
| 405 | for (blk = 1; blk < s->num_blocks; blk++) |
| 406 | s->exp_strategy[ch][blk] = EXP_REUSE; |
| 407 | } |
| 408 | |
| 409 | /* for E-AC-3, determine frame exponent strategy */ |
| 410 | if (CONFIG_EAC3_ENCODER && s->eac3) |
| 411 | ff_eac3_get_frame_exp_strategy(s); |
| 412 | } |
| 413 | |
| 414 | |
| 415 | /** |
| 416 | * Update the exponents so that they are the ones the decoder will decode. |
| 417 | * |
| 418 | * @param[in,out] exp array of exponents for 1 block in 1 channel |
| 419 | * @param nb_exps number of exponents in active bandwidth |
| 420 | * @param exp_strategy exponent strategy for the block |
| 421 | * @param cpl indicates if the block is in the coupling channel |
| 422 | */ |
| 423 | static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy, |
| 424 | int cpl) |
| 425 | { |
| 426 | int nb_groups, i, k; |
| 427 | |
| 428 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3; |
| 429 | |
| 430 | /* for each group, compute the minimum exponent */ |
| 431 | switch(exp_strategy) { |
| 432 | case EXP_D25: |
| 433 | for (i = 1, k = 1-cpl; i <= nb_groups; i++) { |
| 434 | uint8_t exp_min = exp[k]; |
| 435 | if (exp[k+1] < exp_min) |
| 436 | exp_min = exp[k+1]; |
| 437 | exp[i-cpl] = exp_min; |
| 438 | k += 2; |
| 439 | } |
| 440 | break; |
| 441 | case EXP_D45: |
| 442 | for (i = 1, k = 1-cpl; i <= nb_groups; i++) { |
| 443 | uint8_t exp_min = exp[k]; |
| 444 | if (exp[k+1] < exp_min) |
| 445 | exp_min = exp[k+1]; |
| 446 | if (exp[k+2] < exp_min) |
| 447 | exp_min = exp[k+2]; |
| 448 | if (exp[k+3] < exp_min) |
| 449 | exp_min = exp[k+3]; |
| 450 | exp[i-cpl] = exp_min; |
| 451 | k += 4; |
| 452 | } |
| 453 | break; |
| 454 | } |
| 455 | |
| 456 | /* constraint for DC exponent */ |
| 457 | if (!cpl && exp[0] > 15) |
| 458 | exp[0] = 15; |
| 459 | |
| 460 | /* decrease the delta between each groups to within 2 so that they can be |
| 461 | differentially encoded */ |
| 462 | for (i = 1; i <= nb_groups; i++) |
| 463 | exp[i] = FFMIN(exp[i], exp[i-1] + 2); |
| 464 | i--; |
| 465 | while (--i >= 0) |
| 466 | exp[i] = FFMIN(exp[i], exp[i+1] + 2); |
| 467 | |
| 468 | if (cpl) |
| 469 | exp[-1] = exp[0] & ~1; |
| 470 | |
| 471 | /* now we have the exponent values the decoder will see */ |
| 472 | switch (exp_strategy) { |
| 473 | case EXP_D25: |
| 474 | for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) { |
| 475 | uint8_t exp1 = exp[i-cpl]; |
| 476 | exp[k--] = exp1; |
| 477 | exp[k--] = exp1; |
| 478 | } |
| 479 | break; |
| 480 | case EXP_D45: |
| 481 | for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) { |
| 482 | exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl]; |
| 483 | k -= 4; |
| 484 | } |
| 485 | break; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | |
| 490 | /* |
| 491 | * Encode exponents from original extracted form to what the decoder will see. |
| 492 | * This copies and groups exponents based on exponent strategy and reduces |
| 493 | * deltas between adjacent exponent groups so that they can be differentially |
| 494 | * encoded. |
| 495 | */ |
| 496 | static void encode_exponents(AC3EncodeContext *s) |
| 497 | { |
| 498 | int blk, blk1, ch, cpl; |
| 499 | uint8_t *exp, *exp_strategy; |
| 500 | int nb_coefs, num_reuse_blocks; |
| 501 | |
| 502 | for (ch = !s->cpl_on; ch <= s->channels; ch++) { |
| 503 | exp = s->blocks[0].exp[ch] + s->start_freq[ch]; |
| 504 | exp_strategy = s->exp_strategy[ch]; |
| 505 | |
| 506 | cpl = (ch == CPL_CH); |
| 507 | blk = 0; |
| 508 | while (blk < s->num_blocks) { |
| 509 | AC3Block *block = &s->blocks[blk]; |
| 510 | if (cpl && !block->cpl_in_use) { |
| 511 | exp += AC3_MAX_COEFS; |
| 512 | blk++; |
| 513 | continue; |
| 514 | } |
| 515 | nb_coefs = block->end_freq[ch] - s->start_freq[ch]; |
| 516 | blk1 = blk + 1; |
| 517 | |
| 518 | /* count the number of EXP_REUSE blocks after the current block |
| 519 | and set exponent reference block numbers */ |
| 520 | s->exp_ref_block[ch][blk] = blk; |
| 521 | while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) { |
| 522 | s->exp_ref_block[ch][blk1] = blk; |
| 523 | blk1++; |
| 524 | } |
| 525 | num_reuse_blocks = blk1 - blk - 1; |
| 526 | |
| 527 | /* for the EXP_REUSE case we select the min of the exponents */ |
| 528 | s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks, |
| 529 | AC3_MAX_COEFS); |
| 530 | |
| 531 | encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl); |
| 532 | |
| 533 | exp += AC3_MAX_COEFS * (num_reuse_blocks + 1); |
| 534 | blk = blk1; |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | /* reference block numbers have been changed, so reset ref_bap_set */ |
| 539 | s->ref_bap_set = 0; |
| 540 | } |
| 541 | |
| 542 | |
| 543 | /* |
| 544 | * Count exponent bits based on bandwidth, coupling, and exponent strategies. |
| 545 | */ |
| 546 | static int count_exponent_bits(AC3EncodeContext *s) |
| 547 | { |
| 548 | int blk, ch; |
| 549 | int nb_groups, bit_count; |
| 550 | |
| 551 | bit_count = 0; |
| 552 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 553 | AC3Block *block = &s->blocks[blk]; |
| 554 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 555 | int exp_strategy = s->exp_strategy[ch][blk]; |
| 556 | int cpl = (ch == CPL_CH); |
| 557 | int nb_coefs = block->end_freq[ch] - s->start_freq[ch]; |
| 558 | |
| 559 | if (exp_strategy == EXP_REUSE) |
| 560 | continue; |
| 561 | |
| 562 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs]; |
| 563 | bit_count += 4 + (nb_groups * 7); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | return bit_count; |
| 568 | } |
| 569 | |
| 570 | |
| 571 | /** |
| 572 | * Group exponents. |
| 573 | * 3 delta-encoded exponents are in each 7-bit group. The number of groups |
| 574 | * varies depending on exponent strategy and bandwidth. |
| 575 | * |
| 576 | * @param s AC-3 encoder private context |
| 577 | */ |
| 578 | void ff_ac3_group_exponents(AC3EncodeContext *s) |
| 579 | { |
| 580 | int blk, ch, i, cpl; |
| 581 | int group_size, nb_groups; |
| 582 | uint8_t *p; |
| 583 | int delta0, delta1, delta2; |
| 584 | int exp0, exp1; |
| 585 | |
| 586 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 587 | AC3Block *block = &s->blocks[blk]; |
| 588 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 589 | int exp_strategy = s->exp_strategy[ch][blk]; |
| 590 | if (exp_strategy == EXP_REUSE) |
| 591 | continue; |
| 592 | cpl = (ch == CPL_CH); |
| 593 | group_size = exp_strategy + (exp_strategy == EXP_D45); |
| 594 | nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]]; |
| 595 | p = block->exp[ch] + s->start_freq[ch] - cpl; |
| 596 | |
| 597 | /* DC exponent */ |
| 598 | exp1 = *p++; |
| 599 | block->grouped_exp[ch][0] = exp1; |
| 600 | |
| 601 | /* remaining exponents are delta encoded */ |
| 602 | for (i = 1; i <= nb_groups; i++) { |
| 603 | /* merge three delta in one code */ |
| 604 | exp0 = exp1; |
| 605 | exp1 = p[0]; |
| 606 | p += group_size; |
| 607 | delta0 = exp1 - exp0 + 2; |
| 608 | av_assert2(delta0 >= 0 && delta0 <= 4); |
| 609 | |
| 610 | exp0 = exp1; |
| 611 | exp1 = p[0]; |
| 612 | p += group_size; |
| 613 | delta1 = exp1 - exp0 + 2; |
| 614 | av_assert2(delta1 >= 0 && delta1 <= 4); |
| 615 | |
| 616 | exp0 = exp1; |
| 617 | exp1 = p[0]; |
| 618 | p += group_size; |
| 619 | delta2 = exp1 - exp0 + 2; |
| 620 | av_assert2(delta2 >= 0 && delta2 <= 4); |
| 621 | |
| 622 | block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2; |
| 623 | } |
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | |
| 629 | /** |
| 630 | * Calculate final exponents from the supplied MDCT coefficients and exponent shift. |
| 631 | * Extract exponents from MDCT coefficients, calculate exponent strategies, |
| 632 | * and encode final exponents. |
| 633 | * |
| 634 | * @param s AC-3 encoder private context |
| 635 | */ |
| 636 | void ff_ac3_process_exponents(AC3EncodeContext *s) |
| 637 | { |
| 638 | extract_exponents(s); |
| 639 | |
| 640 | compute_exp_strategy(s); |
| 641 | |
| 642 | encode_exponents(s); |
| 643 | |
| 644 | emms_c(); |
| 645 | } |
| 646 | |
| 647 | |
| 648 | /* |
| 649 | * Count frame bits that are based solely on fixed parameters. |
| 650 | * This only has to be run once when the encoder is initialized. |
| 651 | */ |
| 652 | static void count_frame_bits_fixed(AC3EncodeContext *s) |
| 653 | { |
| 654 | static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 }; |
| 655 | int blk; |
| 656 | int frame_bits; |
| 657 | |
| 658 | /* assumptions: |
| 659 | * no dynamic range codes |
| 660 | * bit allocation parameters do not change between blocks |
| 661 | * no delta bit allocation |
| 662 | * no skipped data |
| 663 | * no auxiliary data |
| 664 | * no E-AC-3 metadata |
| 665 | */ |
| 666 | |
| 667 | /* header */ |
| 668 | frame_bits = 16; /* sync info */ |
| 669 | if (s->eac3) { |
| 670 | /* bitstream info header */ |
| 671 | frame_bits += 35; |
| 672 | frame_bits += 1 + 1; |
| 673 | if (s->num_blocks != 0x6) |
| 674 | frame_bits++; |
| 675 | frame_bits++; |
| 676 | /* audio frame header */ |
| 677 | if (s->num_blocks == 6) |
| 678 | frame_bits += 2; |
| 679 | frame_bits += 10; |
| 680 | /* exponent strategy */ |
| 681 | if (s->use_frame_exp_strategy) |
| 682 | frame_bits += 5 * s->fbw_channels; |
| 683 | else |
| 684 | frame_bits += s->num_blocks * 2 * s->fbw_channels; |
| 685 | if (s->lfe_on) |
| 686 | frame_bits += s->num_blocks; |
| 687 | /* converter exponent strategy */ |
| 688 | if (s->num_blks_code != 0x3) |
| 689 | frame_bits++; |
| 690 | else |
| 691 | frame_bits += s->fbw_channels * 5; |
| 692 | /* snr offsets */ |
| 693 | frame_bits += 10; |
| 694 | /* block start info */ |
| 695 | if (s->num_blocks != 1) |
| 696 | frame_bits++; |
| 697 | } else { |
| 698 | frame_bits += 49; |
| 699 | frame_bits += frame_bits_inc[s->channel_mode]; |
| 700 | } |
| 701 | |
| 702 | /* audio blocks */ |
| 703 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 704 | if (!s->eac3) { |
| 705 | /* block switch flags */ |
| 706 | frame_bits += s->fbw_channels; |
| 707 | |
| 708 | /* dither flags */ |
| 709 | frame_bits += s->fbw_channels; |
| 710 | } |
| 711 | |
| 712 | /* dynamic range */ |
| 713 | frame_bits++; |
| 714 | |
| 715 | /* spectral extension */ |
| 716 | if (s->eac3) |
| 717 | frame_bits++; |
| 718 | |
| 719 | if (!s->eac3) { |
| 720 | /* exponent strategy */ |
| 721 | frame_bits += 2 * s->fbw_channels; |
| 722 | if (s->lfe_on) |
| 723 | frame_bits++; |
| 724 | |
| 725 | /* bit allocation params */ |
| 726 | frame_bits++; |
| 727 | if (!blk) |
| 728 | frame_bits += 2 + 2 + 2 + 2 + 3; |
| 729 | } |
| 730 | |
| 731 | /* converter snr offset */ |
| 732 | if (s->eac3) |
| 733 | frame_bits++; |
| 734 | |
| 735 | if (!s->eac3) { |
| 736 | /* delta bit allocation */ |
| 737 | frame_bits++; |
| 738 | |
| 739 | /* skipped data */ |
| 740 | frame_bits++; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | /* auxiliary data */ |
| 745 | frame_bits++; |
| 746 | |
| 747 | /* CRC */ |
| 748 | frame_bits += 1 + 16; |
| 749 | |
| 750 | s->frame_bits_fixed = frame_bits; |
| 751 | } |
| 752 | |
| 753 | |
| 754 | /* |
| 755 | * Initialize bit allocation. |
| 756 | * Set default parameter codes and calculate parameter values. |
| 757 | */ |
| 758 | static av_cold void bit_alloc_init(AC3EncodeContext *s) |
| 759 | { |
| 760 | int ch; |
| 761 | |
| 762 | /* init default parameters */ |
| 763 | s->slow_decay_code = 2; |
| 764 | s->fast_decay_code = 1; |
| 765 | s->slow_gain_code = 1; |
| 766 | s->db_per_bit_code = s->eac3 ? 2 : 3; |
| 767 | s->floor_code = 7; |
| 768 | for (ch = 0; ch <= s->channels; ch++) |
| 769 | s->fast_gain_code[ch] = 4; |
| 770 | |
| 771 | /* initial snr offset */ |
| 772 | s->coarse_snr_offset = 40; |
| 773 | |
| 774 | /* compute real values */ |
| 775 | /* currently none of these values change during encoding, so we can just |
| 776 | set them once at initialization */ |
| 777 | s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift; |
| 778 | s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift; |
| 779 | s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code]; |
| 780 | s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code]; |
| 781 | s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code]; |
| 782 | s->bit_alloc.cpl_fast_leak = 0; |
| 783 | s->bit_alloc.cpl_slow_leak = 0; |
| 784 | |
| 785 | count_frame_bits_fixed(s); |
| 786 | } |
| 787 | |
| 788 | |
| 789 | /* |
| 790 | * Count the bits used to encode the frame, minus exponents and mantissas. |
| 791 | * Bits based on fixed parameters have already been counted, so now we just |
| 792 | * have to add the bits based on parameters that change during encoding. |
| 793 | */ |
| 794 | static void count_frame_bits(AC3EncodeContext *s) |
| 795 | { |
| 796 | AC3EncOptions *opt = &s->options; |
| 797 | int blk, ch; |
| 798 | int frame_bits = 0; |
| 799 | |
| 800 | /* header */ |
| 801 | if (s->eac3) { |
| 802 | if (opt->eac3_mixing_metadata) { |
| 803 | if (s->channel_mode > AC3_CHMODE_STEREO) |
| 804 | frame_bits += 2; |
| 805 | if (s->has_center) |
| 806 | frame_bits += 6; |
| 807 | if (s->has_surround) |
| 808 | frame_bits += 6; |
| 809 | frame_bits += s->lfe_on; |
| 810 | frame_bits += 1 + 1 + 2; |
| 811 | if (s->channel_mode < AC3_CHMODE_STEREO) |
| 812 | frame_bits++; |
| 813 | frame_bits++; |
| 814 | } |
| 815 | if (opt->eac3_info_metadata) { |
| 816 | frame_bits += 3 + 1 + 1; |
| 817 | if (s->channel_mode == AC3_CHMODE_STEREO) |
| 818 | frame_bits += 2 + 2; |
| 819 | if (s->channel_mode >= AC3_CHMODE_2F2R) |
| 820 | frame_bits += 2; |
| 821 | frame_bits++; |
| 822 | if (opt->audio_production_info) |
| 823 | frame_bits += 5 + 2 + 1; |
| 824 | frame_bits++; |
| 825 | } |
| 826 | /* coupling */ |
| 827 | if (s->channel_mode > AC3_CHMODE_MONO) { |
| 828 | frame_bits++; |
| 829 | for (blk = 1; blk < s->num_blocks; blk++) { |
| 830 | AC3Block *block = &s->blocks[blk]; |
| 831 | frame_bits++; |
| 832 | if (block->new_cpl_strategy) |
| 833 | frame_bits++; |
| 834 | } |
| 835 | } |
| 836 | /* coupling exponent strategy */ |
| 837 | if (s->cpl_on) { |
| 838 | if (s->use_frame_exp_strategy) { |
| 839 | frame_bits += 5 * s->cpl_on; |
| 840 | } else { |
| 841 | for (blk = 0; blk < s->num_blocks; blk++) |
| 842 | frame_bits += 2 * s->blocks[blk].cpl_in_use; |
| 843 | } |
| 844 | } |
| 845 | } else { |
| 846 | if (opt->audio_production_info) |
| 847 | frame_bits += 7; |
| 848 | if (s->bitstream_id == 6) { |
| 849 | if (opt->extended_bsi_1) |
| 850 | frame_bits += 14; |
| 851 | if (opt->extended_bsi_2) |
| 852 | frame_bits += 14; |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | /* audio blocks */ |
| 857 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 858 | AC3Block *block = &s->blocks[blk]; |
| 859 | |
| 860 | /* coupling strategy */ |
| 861 | if (!s->eac3) |
| 862 | frame_bits++; |
| 863 | if (block->new_cpl_strategy) { |
| 864 | if (!s->eac3) |
| 865 | frame_bits++; |
| 866 | if (block->cpl_in_use) { |
| 867 | if (s->eac3) |
| 868 | frame_bits++; |
| 869 | if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) |
| 870 | frame_bits += s->fbw_channels; |
| 871 | if (s->channel_mode == AC3_CHMODE_STEREO) |
| 872 | frame_bits++; |
| 873 | frame_bits += 4 + 4; |
| 874 | if (s->eac3) |
| 875 | frame_bits++; |
| 876 | else |
| 877 | frame_bits += s->num_cpl_subbands - 1; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | /* coupling coordinates */ |
| 882 | if (block->cpl_in_use) { |
| 883 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 884 | if (block->channel_in_cpl[ch]) { |
| 885 | if (!s->eac3 || block->new_cpl_coords[ch] != 2) |
| 886 | frame_bits++; |
| 887 | if (block->new_cpl_coords[ch]) { |
| 888 | frame_bits += 2; |
| 889 | frame_bits += (4 + 4) * s->num_cpl_bands; |
| 890 | } |
| 891 | } |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | /* stereo rematrixing */ |
| 896 | if (s->channel_mode == AC3_CHMODE_STEREO) { |
| 897 | if (!s->eac3 || blk > 0) |
| 898 | frame_bits++; |
| 899 | if (s->blocks[blk].new_rematrixing_strategy) |
| 900 | frame_bits += block->num_rematrixing_bands; |
| 901 | } |
| 902 | |
| 903 | /* bandwidth codes & gain range */ |
| 904 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 905 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { |
| 906 | if (!block->channel_in_cpl[ch]) |
| 907 | frame_bits += 6; |
| 908 | frame_bits += 2; |
| 909 | } |
| 910 | } |
| 911 | |
| 912 | /* coupling exponent strategy */ |
| 913 | if (!s->eac3 && block->cpl_in_use) |
| 914 | frame_bits += 2; |
| 915 | |
| 916 | /* snr offsets and fast gain codes */ |
| 917 | if (!s->eac3) { |
| 918 | frame_bits++; |
| 919 | if (block->new_snr_offsets) |
| 920 | frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3); |
| 921 | } |
| 922 | |
| 923 | /* coupling leak info */ |
| 924 | if (block->cpl_in_use) { |
| 925 | if (!s->eac3 || block->new_cpl_leak != 2) |
| 926 | frame_bits++; |
| 927 | if (block->new_cpl_leak) |
| 928 | frame_bits += 3 + 3; |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | s->frame_bits = s->frame_bits_fixed + frame_bits; |
| 933 | } |
| 934 | |
| 935 | |
| 936 | /* |
| 937 | * Calculate masking curve based on the final exponents. |
| 938 | * Also calculate the power spectral densities to use in future calculations. |
| 939 | */ |
| 940 | static void bit_alloc_masking(AC3EncodeContext *s) |
| 941 | { |
| 942 | int blk, ch; |
| 943 | |
| 944 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 945 | AC3Block *block = &s->blocks[blk]; |
| 946 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 947 | /* We only need psd and mask for calculating bap. |
| 948 | Since we currently do not calculate bap when exponent |
| 949 | strategy is EXP_REUSE we do not need to calculate psd or mask. */ |
| 950 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { |
| 951 | ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch], |
| 952 | block->end_freq[ch], block->psd[ch], |
| 953 | block->band_psd[ch]); |
| 954 | ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch], |
| 955 | s->start_freq[ch], block->end_freq[ch], |
| 956 | ff_ac3_fast_gain_tab[s->fast_gain_code[ch]], |
| 957 | ch == s->lfe_channel, |
| 958 | DBA_NONE, 0, NULL, NULL, NULL, |
| 959 | block->mask[ch]); |
| 960 | } |
| 961 | } |
| 962 | } |
| 963 | } |
| 964 | |
| 965 | |
| 966 | /* |
| 967 | * Ensure that bap for each block and channel point to the current bap_buffer. |
| 968 | * They may have been switched during the bit allocation search. |
| 969 | */ |
| 970 | static void reset_block_bap(AC3EncodeContext *s) |
| 971 | { |
| 972 | int blk, ch; |
| 973 | uint8_t *ref_bap; |
| 974 | |
| 975 | if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set) |
| 976 | return; |
| 977 | |
| 978 | ref_bap = s->bap_buffer; |
| 979 | for (ch = 0; ch <= s->channels; ch++) { |
| 980 | for (blk = 0; blk < s->num_blocks; blk++) |
| 981 | s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk]; |
| 982 | ref_bap += AC3_MAX_COEFS * s->num_blocks; |
| 983 | } |
| 984 | s->ref_bap_set = 1; |
| 985 | } |
| 986 | |
| 987 | |
| 988 | /** |
| 989 | * Initialize mantissa counts. |
| 990 | * These are set so that they are padded to the next whole group size when bits |
| 991 | * are counted in compute_mantissa_size. |
| 992 | * |
| 993 | * @param[in,out] mant_cnt running counts for each bap value for each block |
| 994 | */ |
| 995 | static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16]) |
| 996 | { |
| 997 | int blk; |
| 998 | |
| 999 | for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { |
| 1000 | memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk])); |
| 1001 | mant_cnt[blk][1] = mant_cnt[blk][2] = 2; |
| 1002 | mant_cnt[blk][4] = 1; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | |
| 1007 | /** |
| 1008 | * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth |
| 1009 | * range. |
| 1010 | * |
| 1011 | * @param s AC-3 encoder private context |
| 1012 | * @param ch channel index |
| 1013 | * @param[in,out] mant_cnt running counts for each bap value for each block |
| 1014 | * @param start starting coefficient bin |
| 1015 | * @param end ending coefficient bin |
| 1016 | */ |
| 1017 | static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch, |
| 1018 | uint16_t mant_cnt[AC3_MAX_BLOCKS][16], |
| 1019 | int start, int end) |
| 1020 | { |
| 1021 | int blk; |
| 1022 | |
| 1023 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 1024 | AC3Block *block = &s->blocks[blk]; |
| 1025 | if (ch == CPL_CH && !block->cpl_in_use) |
| 1026 | continue; |
| 1027 | s->ac3dsp.update_bap_counts(mant_cnt[blk], |
| 1028 | s->ref_bap[ch][blk] + start, |
| 1029 | FFMIN(end, block->end_freq[ch]) - start); |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | |
| 1034 | /* |
| 1035 | * Count the number of mantissa bits in the frame based on the bap values. |
| 1036 | */ |
| 1037 | static int count_mantissa_bits(AC3EncodeContext *s) |
| 1038 | { |
| 1039 | int ch, max_end_freq; |
| 1040 | LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]); |
| 1041 | |
| 1042 | count_mantissa_bits_init(mant_cnt); |
| 1043 | |
| 1044 | max_end_freq = s->bandwidth_code * 3 + 73; |
| 1045 | for (ch = !s->cpl_enabled; ch <= s->channels; ch++) |
| 1046 | count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch], |
| 1047 | max_end_freq); |
| 1048 | |
| 1049 | return s->ac3dsp.compute_mantissa_size(mant_cnt); |
| 1050 | } |
| 1051 | |
| 1052 | |
| 1053 | /** |
| 1054 | * Run the bit allocation with a given SNR offset. |
| 1055 | * This calculates the bit allocation pointers that will be used to determine |
| 1056 | * the quantization of each mantissa. |
| 1057 | * |
| 1058 | * @param s AC-3 encoder private context |
| 1059 | * @param snr_offset SNR offset, 0 to 1023 |
| 1060 | * @return the number of bits needed for mantissas if the given SNR offset is |
| 1061 | * is used. |
| 1062 | */ |
| 1063 | static int bit_alloc(AC3EncodeContext *s, int snr_offset) |
| 1064 | { |
| 1065 | int blk, ch; |
| 1066 | |
| 1067 | snr_offset = (snr_offset - 240) << 2; |
| 1068 | |
| 1069 | reset_block_bap(s); |
| 1070 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 1071 | AC3Block *block = &s->blocks[blk]; |
| 1072 | |
| 1073 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 1074 | /* Currently the only bit allocation parameters which vary across |
| 1075 | blocks within a frame are the exponent values. We can take |
| 1076 | advantage of that by reusing the bit allocation pointers |
| 1077 | whenever we reuse exponents. */ |
| 1078 | if (s->exp_strategy[ch][blk] != EXP_REUSE) { |
| 1079 | s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch], |
| 1080 | s->start_freq[ch], block->end_freq[ch], |
| 1081 | snr_offset, s->bit_alloc.floor, |
| 1082 | ff_ac3_bap_tab, s->ref_bap[ch][blk]); |
| 1083 | } |
| 1084 | } |
| 1085 | } |
| 1086 | return count_mantissa_bits(s); |
| 1087 | } |
| 1088 | |
| 1089 | |
| 1090 | /* |
| 1091 | * Constant bitrate bit allocation search. |
| 1092 | * Find the largest SNR offset that will allow data to fit in the frame. |
| 1093 | */ |
| 1094 | static int cbr_bit_allocation(AC3EncodeContext *s) |
| 1095 | { |
| 1096 | int ch; |
| 1097 | int bits_left; |
| 1098 | int snr_offset, snr_incr; |
| 1099 | |
| 1100 | bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits); |
| 1101 | if (bits_left < 0) |
| 1102 | return AVERROR(EINVAL); |
| 1103 | |
| 1104 | snr_offset = s->coarse_snr_offset << 4; |
| 1105 | |
| 1106 | /* if previous frame SNR offset was 1023, check if current frame can also |
| 1107 | use SNR offset of 1023. if so, skip the search. */ |
| 1108 | if ((snr_offset | s->fine_snr_offset[1]) == 1023) { |
| 1109 | if (bit_alloc(s, 1023) <= bits_left) |
| 1110 | return 0; |
| 1111 | } |
| 1112 | |
| 1113 | while (snr_offset >= 0 && |
| 1114 | bit_alloc(s, snr_offset) > bits_left) { |
| 1115 | snr_offset -= 64; |
| 1116 | } |
| 1117 | if (snr_offset < 0) |
| 1118 | return AVERROR(EINVAL); |
| 1119 | |
| 1120 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); |
| 1121 | for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) { |
| 1122 | while (snr_offset + snr_incr <= 1023 && |
| 1123 | bit_alloc(s, snr_offset + snr_incr) <= bits_left) { |
| 1124 | snr_offset += snr_incr; |
| 1125 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); |
| 1126 | } |
| 1127 | } |
| 1128 | FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer); |
| 1129 | reset_block_bap(s); |
| 1130 | |
| 1131 | s->coarse_snr_offset = snr_offset >> 4; |
| 1132 | for (ch = !s->cpl_on; ch <= s->channels; ch++) |
| 1133 | s->fine_snr_offset[ch] = snr_offset & 0xF; |
| 1134 | |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
| 1138 | |
| 1139 | /* |
| 1140 | * Perform bit allocation search. |
| 1141 | * Finds the SNR offset value that maximizes quality and fits in the specified |
| 1142 | * frame size. Output is the SNR offset and a set of bit allocation pointers |
| 1143 | * used to quantize the mantissas. |
| 1144 | */ |
| 1145 | int ff_ac3_compute_bit_allocation(AC3EncodeContext *s) |
| 1146 | { |
| 1147 | count_frame_bits(s); |
| 1148 | |
| 1149 | s->exponent_bits = count_exponent_bits(s); |
| 1150 | |
| 1151 | bit_alloc_masking(s); |
| 1152 | |
| 1153 | return cbr_bit_allocation(s); |
| 1154 | } |
| 1155 | |
| 1156 | |
| 1157 | /** |
| 1158 | * Symmetric quantization on 'levels' levels. |
| 1159 | * |
| 1160 | * @param c unquantized coefficient |
| 1161 | * @param e exponent |
| 1162 | * @param levels number of quantization levels |
| 1163 | * @return quantized coefficient |
| 1164 | */ |
| 1165 | static inline int sym_quant(int c, int e, int levels) |
| 1166 | { |
| 1167 | int v = (((levels * c) >> (24 - e)) + levels) >> 1; |
| 1168 | av_assert2(v >= 0 && v < levels); |
| 1169 | return v; |
| 1170 | } |
| 1171 | |
| 1172 | |
| 1173 | /** |
| 1174 | * Asymmetric quantization on 2^qbits levels. |
| 1175 | * |
| 1176 | * @param c unquantized coefficient |
| 1177 | * @param e exponent |
| 1178 | * @param qbits number of quantization bits |
| 1179 | * @return quantized coefficient |
| 1180 | */ |
| 1181 | static inline int asym_quant(int c, int e, int qbits) |
| 1182 | { |
| 1183 | int m; |
| 1184 | |
| 1185 | c = (((c << e) >> (24 - qbits)) + 1) >> 1; |
| 1186 | m = (1 << (qbits-1)); |
| 1187 | if (c >= m) |
| 1188 | c = m - 1; |
| 1189 | av_assert2(c >= -m); |
| 1190 | return c; |
| 1191 | } |
| 1192 | |
| 1193 | |
| 1194 | /** |
| 1195 | * Quantize a set of mantissas for a single channel in a single block. |
| 1196 | * |
| 1197 | * @param s Mantissa count context |
| 1198 | * @param fixed_coef unquantized fixed-point coefficients |
| 1199 | * @param exp exponents |
| 1200 | * @param bap bit allocation pointer indices |
| 1201 | * @param[out] qmant quantized coefficients |
| 1202 | * @param start_freq starting coefficient bin |
| 1203 | * @param end_freq ending coefficient bin |
| 1204 | */ |
| 1205 | static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef, |
| 1206 | uint8_t *exp, uint8_t *bap, |
| 1207 | int16_t *qmant, int start_freq, |
| 1208 | int end_freq) |
| 1209 | { |
| 1210 | int i; |
| 1211 | |
| 1212 | for (i = start_freq; i < end_freq; i++) { |
| 1213 | int c = fixed_coef[i]; |
| 1214 | int e = exp[i]; |
| 1215 | int v = bap[i]; |
| 1216 | if (v) |
| 1217 | switch (v) { |
| 1218 | case 1: |
| 1219 | v = sym_quant(c, e, 3); |
| 1220 | switch (s->mant1_cnt) { |
| 1221 | case 0: |
| 1222 | s->qmant1_ptr = &qmant[i]; |
| 1223 | v = 9 * v; |
| 1224 | s->mant1_cnt = 1; |
| 1225 | break; |
| 1226 | case 1: |
| 1227 | *s->qmant1_ptr += 3 * v; |
| 1228 | s->mant1_cnt = 2; |
| 1229 | v = 128; |
| 1230 | break; |
| 1231 | default: |
| 1232 | *s->qmant1_ptr += v; |
| 1233 | s->mant1_cnt = 0; |
| 1234 | v = 128; |
| 1235 | break; |
| 1236 | } |
| 1237 | break; |
| 1238 | case 2: |
| 1239 | v = sym_quant(c, e, 5); |
| 1240 | switch (s->mant2_cnt) { |
| 1241 | case 0: |
| 1242 | s->qmant2_ptr = &qmant[i]; |
| 1243 | v = 25 * v; |
| 1244 | s->mant2_cnt = 1; |
| 1245 | break; |
| 1246 | case 1: |
| 1247 | *s->qmant2_ptr += 5 * v; |
| 1248 | s->mant2_cnt = 2; |
| 1249 | v = 128; |
| 1250 | break; |
| 1251 | default: |
| 1252 | *s->qmant2_ptr += v; |
| 1253 | s->mant2_cnt = 0; |
| 1254 | v = 128; |
| 1255 | break; |
| 1256 | } |
| 1257 | break; |
| 1258 | case 3: |
| 1259 | v = sym_quant(c, e, 7); |
| 1260 | break; |
| 1261 | case 4: |
| 1262 | v = sym_quant(c, e, 11); |
| 1263 | switch (s->mant4_cnt) { |
| 1264 | case 0: |
| 1265 | s->qmant4_ptr = &qmant[i]; |
| 1266 | v = 11 * v; |
| 1267 | s->mant4_cnt = 1; |
| 1268 | break; |
| 1269 | default: |
| 1270 | *s->qmant4_ptr += v; |
| 1271 | s->mant4_cnt = 0; |
| 1272 | v = 128; |
| 1273 | break; |
| 1274 | } |
| 1275 | break; |
| 1276 | case 5: |
| 1277 | v = sym_quant(c, e, 15); |
| 1278 | break; |
| 1279 | case 14: |
| 1280 | v = asym_quant(c, e, 14); |
| 1281 | break; |
| 1282 | case 15: |
| 1283 | v = asym_quant(c, e, 16); |
| 1284 | break; |
| 1285 | default: |
| 1286 | v = asym_quant(c, e, v - 1); |
| 1287 | break; |
| 1288 | } |
| 1289 | qmant[i] = v; |
| 1290 | } |
| 1291 | } |
| 1292 | |
| 1293 | |
| 1294 | /** |
| 1295 | * Quantize mantissas using coefficients, exponents, and bit allocation pointers. |
| 1296 | * |
| 1297 | * @param s AC-3 encoder private context |
| 1298 | */ |
| 1299 | void ff_ac3_quantize_mantissas(AC3EncodeContext *s) |
| 1300 | { |
| 1301 | int blk, ch, ch0=0, got_cpl; |
| 1302 | |
| 1303 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 1304 | AC3Block *block = &s->blocks[blk]; |
| 1305 | AC3Mant m = { 0 }; |
| 1306 | |
| 1307 | got_cpl = !block->cpl_in_use; |
| 1308 | for (ch = 1; ch <= s->channels; ch++) { |
| 1309 | if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { |
| 1310 | ch0 = ch - 1; |
| 1311 | ch = CPL_CH; |
| 1312 | got_cpl = 1; |
| 1313 | } |
| 1314 | quantize_mantissas_blk_ch(&m, block->fixed_coef[ch], |
| 1315 | s->blocks[s->exp_ref_block[ch][blk]].exp[ch], |
| 1316 | s->ref_bap[ch][blk], block->qmant[ch], |
| 1317 | s->start_freq[ch], block->end_freq[ch]); |
| 1318 | if (ch == CPL_CH) |
| 1319 | ch = ch0; |
| 1320 | } |
| 1321 | } |
| 1322 | } |
| 1323 | |
| 1324 | |
| 1325 | /* |
| 1326 | * Write the AC-3 frame header to the output bitstream. |
| 1327 | */ |
| 1328 | static void ac3_output_frame_header(AC3EncodeContext *s) |
| 1329 | { |
| 1330 | AC3EncOptions *opt = &s->options; |
| 1331 | |
| 1332 | put_bits(&s->pb, 16, 0x0b77); /* frame header */ |
| 1333 | put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ |
| 1334 | put_bits(&s->pb, 2, s->bit_alloc.sr_code); |
| 1335 | put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2); |
| 1336 | put_bits(&s->pb, 5, s->bitstream_id); |
| 1337 | put_bits(&s->pb, 3, s->bitstream_mode); |
| 1338 | put_bits(&s->pb, 3, s->channel_mode); |
| 1339 | if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO) |
| 1340 | put_bits(&s->pb, 2, s->center_mix_level); |
| 1341 | if (s->channel_mode & 0x04) |
| 1342 | put_bits(&s->pb, 2, s->surround_mix_level); |
| 1343 | if (s->channel_mode == AC3_CHMODE_STEREO) |
| 1344 | put_bits(&s->pb, 2, opt->dolby_surround_mode); |
| 1345 | put_bits(&s->pb, 1, s->lfe_on); /* LFE */ |
| 1346 | put_bits(&s->pb, 5, -opt->dialogue_level); |
| 1347 | put_bits(&s->pb, 1, 0); /* no compression control word */ |
| 1348 | put_bits(&s->pb, 1, 0); /* no lang code */ |
| 1349 | put_bits(&s->pb, 1, opt->audio_production_info); |
| 1350 | if (opt->audio_production_info) { |
| 1351 | put_bits(&s->pb, 5, opt->mixing_level - 80); |
| 1352 | put_bits(&s->pb, 2, opt->room_type); |
| 1353 | } |
| 1354 | put_bits(&s->pb, 1, opt->copyright); |
| 1355 | put_bits(&s->pb, 1, opt->original); |
| 1356 | if (s->bitstream_id == 6) { |
| 1357 | /* alternate bit stream syntax */ |
| 1358 | put_bits(&s->pb, 1, opt->extended_bsi_1); |
| 1359 | if (opt->extended_bsi_1) { |
| 1360 | put_bits(&s->pb, 2, opt->preferred_stereo_downmix); |
| 1361 | put_bits(&s->pb, 3, s->ltrt_center_mix_level); |
| 1362 | put_bits(&s->pb, 3, s->ltrt_surround_mix_level); |
| 1363 | put_bits(&s->pb, 3, s->loro_center_mix_level); |
| 1364 | put_bits(&s->pb, 3, s->loro_surround_mix_level); |
| 1365 | } |
| 1366 | put_bits(&s->pb, 1, opt->extended_bsi_2); |
| 1367 | if (opt->extended_bsi_2) { |
| 1368 | put_bits(&s->pb, 2, opt->dolby_surround_ex_mode); |
| 1369 | put_bits(&s->pb, 2, opt->dolby_headphone_mode); |
| 1370 | put_bits(&s->pb, 1, opt->ad_converter_type); |
| 1371 | put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */ |
| 1372 | } |
| 1373 | } else { |
| 1374 | put_bits(&s->pb, 1, 0); /* no time code 1 */ |
| 1375 | put_bits(&s->pb, 1, 0); /* no time code 2 */ |
| 1376 | } |
| 1377 | put_bits(&s->pb, 1, 0); /* no additional bit stream info */ |
| 1378 | } |
| 1379 | |
| 1380 | |
| 1381 | /* |
| 1382 | * Write one audio block to the output bitstream. |
| 1383 | */ |
| 1384 | static void output_audio_block(AC3EncodeContext *s, int blk) |
| 1385 | { |
| 1386 | int ch, i, baie, bnd, got_cpl, av_uninit(ch0); |
| 1387 | AC3Block *block = &s->blocks[blk]; |
| 1388 | |
| 1389 | /* block switching */ |
| 1390 | if (!s->eac3) { |
| 1391 | for (ch = 0; ch < s->fbw_channels; ch++) |
| 1392 | put_bits(&s->pb, 1, 0); |
| 1393 | } |
| 1394 | |
| 1395 | /* dither flags */ |
| 1396 | if (!s->eac3) { |
| 1397 | for (ch = 0; ch < s->fbw_channels; ch++) |
| 1398 | put_bits(&s->pb, 1, 1); |
| 1399 | } |
| 1400 | |
| 1401 | /* dynamic range codes */ |
| 1402 | put_bits(&s->pb, 1, 0); |
| 1403 | |
| 1404 | /* spectral extension */ |
| 1405 | if (s->eac3) |
| 1406 | put_bits(&s->pb, 1, 0); |
| 1407 | |
| 1408 | /* channel coupling */ |
| 1409 | if (!s->eac3) |
| 1410 | put_bits(&s->pb, 1, block->new_cpl_strategy); |
| 1411 | if (block->new_cpl_strategy) { |
| 1412 | if (!s->eac3) |
| 1413 | put_bits(&s->pb, 1, block->cpl_in_use); |
| 1414 | if (block->cpl_in_use) { |
| 1415 | int start_sub, end_sub; |
| 1416 | if (s->eac3) |
| 1417 | put_bits(&s->pb, 1, 0); /* enhanced coupling */ |
| 1418 | if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) { |
| 1419 | for (ch = 1; ch <= s->fbw_channels; ch++) |
| 1420 | put_bits(&s->pb, 1, block->channel_in_cpl[ch]); |
| 1421 | } |
| 1422 | if (s->channel_mode == AC3_CHMODE_STEREO) |
| 1423 | put_bits(&s->pb, 1, 0); /* phase flags in use */ |
| 1424 | start_sub = (s->start_freq[CPL_CH] - 37) / 12; |
| 1425 | end_sub = (s->cpl_end_freq - 37) / 12; |
| 1426 | put_bits(&s->pb, 4, start_sub); |
| 1427 | put_bits(&s->pb, 4, end_sub - 3); |
| 1428 | /* coupling band structure */ |
| 1429 | if (s->eac3) { |
| 1430 | put_bits(&s->pb, 1, 0); /* use default */ |
| 1431 | } else { |
| 1432 | for (bnd = start_sub+1; bnd < end_sub; bnd++) |
| 1433 | put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]); |
| 1434 | } |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | /* coupling coordinates */ |
| 1439 | if (block->cpl_in_use) { |
| 1440 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 1441 | if (block->channel_in_cpl[ch]) { |
| 1442 | if (!s->eac3 || block->new_cpl_coords[ch] != 2) |
| 1443 | put_bits(&s->pb, 1, block->new_cpl_coords[ch]); |
| 1444 | if (block->new_cpl_coords[ch]) { |
| 1445 | put_bits(&s->pb, 2, block->cpl_master_exp[ch]); |
| 1446 | for (bnd = 0; bnd < s->num_cpl_bands; bnd++) { |
| 1447 | put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]); |
| 1448 | put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]); |
| 1449 | } |
| 1450 | } |
| 1451 | } |
| 1452 | } |
| 1453 | } |
| 1454 | |
| 1455 | /* stereo rematrixing */ |
| 1456 | if (s->channel_mode == AC3_CHMODE_STEREO) { |
| 1457 | if (!s->eac3 || blk > 0) |
| 1458 | put_bits(&s->pb, 1, block->new_rematrixing_strategy); |
| 1459 | if (block->new_rematrixing_strategy) { |
| 1460 | /* rematrixing flags */ |
| 1461 | for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) |
| 1462 | put_bits(&s->pb, 1, block->rematrixing_flags[bnd]); |
| 1463 | } |
| 1464 | } |
| 1465 | |
| 1466 | /* exponent strategy */ |
| 1467 | if (!s->eac3) { |
| 1468 | for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++) |
| 1469 | put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); |
| 1470 | if (s->lfe_on) |
| 1471 | put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); |
| 1472 | } |
| 1473 | |
| 1474 | /* bandwidth */ |
| 1475 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 1476 | if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch]) |
| 1477 | put_bits(&s->pb, 6, s->bandwidth_code); |
| 1478 | } |
| 1479 | |
| 1480 | /* exponents */ |
| 1481 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 1482 | int nb_groups; |
| 1483 | int cpl = (ch == CPL_CH); |
| 1484 | |
| 1485 | if (s->exp_strategy[ch][blk] == EXP_REUSE) |
| 1486 | continue; |
| 1487 | |
| 1488 | /* DC exponent */ |
| 1489 | put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl); |
| 1490 | |
| 1491 | /* exponent groups */ |
| 1492 | nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]]; |
| 1493 | for (i = 1; i <= nb_groups; i++) |
| 1494 | put_bits(&s->pb, 7, block->grouped_exp[ch][i]); |
| 1495 | |
| 1496 | /* gain range info */ |
| 1497 | if (ch != s->lfe_channel && !cpl) |
| 1498 | put_bits(&s->pb, 2, 0); |
| 1499 | } |
| 1500 | |
| 1501 | /* bit allocation info */ |
| 1502 | if (!s->eac3) { |
| 1503 | baie = (blk == 0); |
| 1504 | put_bits(&s->pb, 1, baie); |
| 1505 | if (baie) { |
| 1506 | put_bits(&s->pb, 2, s->slow_decay_code); |
| 1507 | put_bits(&s->pb, 2, s->fast_decay_code); |
| 1508 | put_bits(&s->pb, 2, s->slow_gain_code); |
| 1509 | put_bits(&s->pb, 2, s->db_per_bit_code); |
| 1510 | put_bits(&s->pb, 3, s->floor_code); |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | /* snr offset */ |
| 1515 | if (!s->eac3) { |
| 1516 | put_bits(&s->pb, 1, block->new_snr_offsets); |
| 1517 | if (block->new_snr_offsets) { |
| 1518 | put_bits(&s->pb, 6, s->coarse_snr_offset); |
| 1519 | for (ch = !block->cpl_in_use; ch <= s->channels; ch++) { |
| 1520 | put_bits(&s->pb, 4, s->fine_snr_offset[ch]); |
| 1521 | put_bits(&s->pb, 3, s->fast_gain_code[ch]); |
| 1522 | } |
| 1523 | } |
| 1524 | } else { |
| 1525 | put_bits(&s->pb, 1, 0); /* no converter snr offset */ |
| 1526 | } |
| 1527 | |
| 1528 | /* coupling leak */ |
| 1529 | if (block->cpl_in_use) { |
| 1530 | if (!s->eac3 || block->new_cpl_leak != 2) |
| 1531 | put_bits(&s->pb, 1, block->new_cpl_leak); |
| 1532 | if (block->new_cpl_leak) { |
| 1533 | put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak); |
| 1534 | put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak); |
| 1535 | } |
| 1536 | } |
| 1537 | |
| 1538 | if (!s->eac3) { |
| 1539 | put_bits(&s->pb, 1, 0); /* no delta bit allocation */ |
| 1540 | put_bits(&s->pb, 1, 0); /* no data to skip */ |
| 1541 | } |
| 1542 | |
| 1543 | /* mantissas */ |
| 1544 | got_cpl = !block->cpl_in_use; |
| 1545 | for (ch = 1; ch <= s->channels; ch++) { |
| 1546 | int b, q; |
| 1547 | |
| 1548 | if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) { |
| 1549 | ch0 = ch - 1; |
| 1550 | ch = CPL_CH; |
| 1551 | got_cpl = 1; |
| 1552 | } |
| 1553 | for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) { |
| 1554 | q = block->qmant[ch][i]; |
| 1555 | b = s->ref_bap[ch][blk][i]; |
| 1556 | switch (b) { |
| 1557 | case 0: break; |
| 1558 | case 1: if (q != 128) put_bits (&s->pb, 5, q); break; |
| 1559 | case 2: if (q != 128) put_bits (&s->pb, 7, q); break; |
| 1560 | case 3: put_sbits(&s->pb, 3, q); break; |
| 1561 | case 4: if (q != 128) put_bits (&s->pb, 7, q); break; |
| 1562 | case 14: put_sbits(&s->pb, 14, q); break; |
| 1563 | case 15: put_sbits(&s->pb, 16, q); break; |
| 1564 | default: put_sbits(&s->pb, b-1, q); break; |
| 1565 | } |
| 1566 | } |
| 1567 | if (ch == CPL_CH) |
| 1568 | ch = ch0; |
| 1569 | } |
| 1570 | } |
| 1571 | |
| 1572 | |
| 1573 | /** CRC-16 Polynomial */ |
| 1574 | #define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16)) |
| 1575 | |
| 1576 | |
| 1577 | static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly) |
| 1578 | { |
| 1579 | unsigned int c; |
| 1580 | |
| 1581 | c = 0; |
| 1582 | while (a) { |
| 1583 | if (a & 1) |
| 1584 | c ^= b; |
| 1585 | a = a >> 1; |
| 1586 | b = b << 1; |
| 1587 | if (b & (1 << 16)) |
| 1588 | b ^= poly; |
| 1589 | } |
| 1590 | return c; |
| 1591 | } |
| 1592 | |
| 1593 | |
| 1594 | static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly) |
| 1595 | { |
| 1596 | unsigned int r; |
| 1597 | r = 1; |
| 1598 | while (n) { |
| 1599 | if (n & 1) |
| 1600 | r = mul_poly(r, a, poly); |
| 1601 | a = mul_poly(a, a, poly); |
| 1602 | n >>= 1; |
| 1603 | } |
| 1604 | return r; |
| 1605 | } |
| 1606 | |
| 1607 | |
| 1608 | /* |
| 1609 | * Fill the end of the frame with 0's and compute the two CRCs. |
| 1610 | */ |
| 1611 | static void output_frame_end(AC3EncodeContext *s) |
| 1612 | { |
| 1613 | const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI); |
| 1614 | int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv; |
| 1615 | uint8_t *frame; |
| 1616 | |
| 1617 | frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1; |
| 1618 | |
| 1619 | /* pad the remainder of the frame with zeros */ |
| 1620 | av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18); |
| 1621 | flush_put_bits(&s->pb); |
| 1622 | frame = s->pb.buf; |
| 1623 | pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2; |
| 1624 | av_assert2(pad_bytes >= 0); |
| 1625 | if (pad_bytes > 0) |
| 1626 | memset(put_bits_ptr(&s->pb), 0, pad_bytes); |
| 1627 | |
| 1628 | if (s->eac3) { |
| 1629 | /* compute crc2 */ |
| 1630 | crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5); |
| 1631 | } else { |
| 1632 | /* compute crc1 */ |
| 1633 | /* this is not so easy because it is at the beginning of the data... */ |
| 1634 | crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4)); |
| 1635 | crc_inv = s->crc_inv[s->frame_size > s->frame_size_min]; |
| 1636 | crc1 = mul_poly(crc_inv, crc1, CRC16_POLY); |
| 1637 | AV_WB16(frame + 2, crc1); |
| 1638 | |
| 1639 | /* compute crc2 */ |
| 1640 | crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58, |
| 1641 | s->frame_size - frame_size_58 - 3); |
| 1642 | } |
| 1643 | crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); |
| 1644 | /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */ |
| 1645 | if (crc2 == 0x770B) { |
| 1646 | frame[s->frame_size - 3] ^= 0x1; |
| 1647 | crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1); |
| 1648 | } |
| 1649 | crc2 = av_bswap16(crc2); |
| 1650 | AV_WB16(frame + s->frame_size - 2, crc2); |
| 1651 | } |
| 1652 | |
| 1653 | |
| 1654 | /** |
| 1655 | * Write the frame to the output bitstream. |
| 1656 | * |
| 1657 | * @param s AC-3 encoder private context |
| 1658 | * @param frame output data buffer |
| 1659 | */ |
| 1660 | void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame) |
| 1661 | { |
| 1662 | int blk; |
| 1663 | |
| 1664 | init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); |
| 1665 | |
| 1666 | s->output_frame_header(s); |
| 1667 | |
| 1668 | for (blk = 0; blk < s->num_blocks; blk++) |
| 1669 | output_audio_block(s, blk); |
| 1670 | |
| 1671 | output_frame_end(s); |
| 1672 | } |
| 1673 | |
| 1674 | |
| 1675 | static void dprint_options(AC3EncodeContext *s) |
| 1676 | { |
| 1677 | #ifdef DEBUG |
| 1678 | AVCodecContext *avctx = s->avctx; |
| 1679 | AC3EncOptions *opt = &s->options; |
| 1680 | char strbuf[32]; |
| 1681 | |
| 1682 | switch (s->bitstream_id) { |
| 1683 | case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break; |
| 1684 | case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break; |
| 1685 | case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break; |
| 1686 | case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break; |
| 1687 | case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break; |
| 1688 | default: snprintf(strbuf, 32, "ERROR"); |
| 1689 | } |
| 1690 | av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id); |
| 1691 | av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt)); |
| 1692 | av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout); |
| 1693 | av_dlog(avctx, "channel_layout: %s\n", strbuf); |
| 1694 | av_dlog(avctx, "sample_rate: %d\n", s->sample_rate); |
| 1695 | av_dlog(avctx, "bit_rate: %d\n", s->bit_rate); |
| 1696 | av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code); |
| 1697 | if (s->cutoff) |
| 1698 | av_dlog(avctx, "cutoff: %d\n", s->cutoff); |
| 1699 | |
| 1700 | av_dlog(avctx, "per_frame_metadata: %s\n", |
| 1701 | opt->allow_per_frame_metadata?"on":"off"); |
| 1702 | if (s->has_center) |
| 1703 | av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level, |
| 1704 | s->center_mix_level); |
| 1705 | else |
| 1706 | av_dlog(avctx, "center_mixlev: {not written}\n"); |
| 1707 | if (s->has_surround) |
| 1708 | av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level, |
| 1709 | s->surround_mix_level); |
| 1710 | else |
| 1711 | av_dlog(avctx, "surround_mixlev: {not written}\n"); |
| 1712 | if (opt->audio_production_info) { |
| 1713 | av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level); |
| 1714 | switch (opt->room_type) { |
| 1715 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; |
| 1716 | case AC3ENC_OPT_LARGE_ROOM: av_strlcpy(strbuf, "large", 32); break; |
| 1717 | case AC3ENC_OPT_SMALL_ROOM: av_strlcpy(strbuf, "small", 32); break; |
| 1718 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type); |
| 1719 | } |
| 1720 | av_dlog(avctx, "room_type: %s\n", strbuf); |
| 1721 | } else { |
| 1722 | av_dlog(avctx, "mixing_level: {not written}\n"); |
| 1723 | av_dlog(avctx, "room_type: {not written}\n"); |
| 1724 | } |
| 1725 | av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off"); |
| 1726 | av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level); |
| 1727 | if (s->channel_mode == AC3_CHMODE_STEREO) { |
| 1728 | switch (opt->dolby_surround_mode) { |
| 1729 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; |
| 1730 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; |
| 1731 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; |
| 1732 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode); |
| 1733 | } |
| 1734 | av_dlog(avctx, "dsur_mode: %s\n", strbuf); |
| 1735 | } else { |
| 1736 | av_dlog(avctx, "dsur_mode: {not written}\n"); |
| 1737 | } |
| 1738 | av_dlog(avctx, "original: %s\n", opt->original?"on":"off"); |
| 1739 | |
| 1740 | if (s->bitstream_id == 6) { |
| 1741 | if (opt->extended_bsi_1) { |
| 1742 | switch (opt->preferred_stereo_downmix) { |
| 1743 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; |
| 1744 | case AC3ENC_OPT_DOWNMIX_LTRT: av_strlcpy(strbuf, "ltrt", 32); break; |
| 1745 | case AC3ENC_OPT_DOWNMIX_LORO: av_strlcpy(strbuf, "loro", 32); break; |
| 1746 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix); |
| 1747 | } |
| 1748 | av_dlog(avctx, "dmix_mode: %s\n", strbuf); |
| 1749 | av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n", |
| 1750 | opt->ltrt_center_mix_level, s->ltrt_center_mix_level); |
| 1751 | av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n", |
| 1752 | opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level); |
| 1753 | av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n", |
| 1754 | opt->loro_center_mix_level, s->loro_center_mix_level); |
| 1755 | av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n", |
| 1756 | opt->loro_surround_mix_level, s->loro_surround_mix_level); |
| 1757 | } else { |
| 1758 | av_dlog(avctx, "extended bitstream info 1: {not written}\n"); |
| 1759 | } |
| 1760 | if (opt->extended_bsi_2) { |
| 1761 | switch (opt->dolby_surround_ex_mode) { |
| 1762 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; |
| 1763 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; |
| 1764 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; |
| 1765 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode); |
| 1766 | } |
| 1767 | av_dlog(avctx, "dsurex_mode: %s\n", strbuf); |
| 1768 | switch (opt->dolby_headphone_mode) { |
| 1769 | case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break; |
| 1770 | case AC3ENC_OPT_MODE_ON: av_strlcpy(strbuf, "on", 32); break; |
| 1771 | case AC3ENC_OPT_MODE_OFF: av_strlcpy(strbuf, "off", 32); break; |
| 1772 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode); |
| 1773 | } |
| 1774 | av_dlog(avctx, "dheadphone_mode: %s\n", strbuf); |
| 1775 | |
| 1776 | switch (opt->ad_converter_type) { |
| 1777 | case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break; |
| 1778 | case AC3ENC_OPT_ADCONV_HDCD: av_strlcpy(strbuf, "hdcd", 32); break; |
| 1779 | default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type); |
| 1780 | } |
| 1781 | av_dlog(avctx, "ad_conv_type: %s\n", strbuf); |
| 1782 | } else { |
| 1783 | av_dlog(avctx, "extended bitstream info 2: {not written}\n"); |
| 1784 | } |
| 1785 | } |
| 1786 | #endif |
| 1787 | } |
| 1788 | |
| 1789 | |
| 1790 | #define FLT_OPTION_THRESHOLD 0.01 |
| 1791 | |
| 1792 | static int validate_float_option(float v, const float *v_list, int v_list_size) |
| 1793 | { |
| 1794 | int i; |
| 1795 | |
| 1796 | for (i = 0; i < v_list_size; i++) { |
| 1797 | if (v < (v_list[i] + FLT_OPTION_THRESHOLD) && |
| 1798 | v > (v_list[i] - FLT_OPTION_THRESHOLD)) |
| 1799 | break; |
| 1800 | } |
| 1801 | if (i == v_list_size) |
| 1802 | return -1; |
| 1803 | |
| 1804 | return i; |
| 1805 | } |
| 1806 | |
| 1807 | |
| 1808 | static void validate_mix_level(void *log_ctx, const char *opt_name, |
| 1809 | float *opt_param, const float *list, |
| 1810 | int list_size, int default_value, int min_value, |
| 1811 | int *ctx_param) |
| 1812 | { |
| 1813 | int mixlev = validate_float_option(*opt_param, list, list_size); |
| 1814 | if (mixlev < min_value) { |
| 1815 | mixlev = default_value; |
| 1816 | if (*opt_param >= 0.0) { |
| 1817 | av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using " |
| 1818 | "default value: %0.3f\n", opt_name, list[mixlev]); |
| 1819 | } |
| 1820 | } |
| 1821 | *opt_param = list[mixlev]; |
| 1822 | *ctx_param = mixlev; |
| 1823 | } |
| 1824 | |
| 1825 | |
| 1826 | /** |
| 1827 | * Validate metadata options as set by AVOption system. |
| 1828 | * These values can optionally be changed per-frame. |
| 1829 | * |
| 1830 | * @param s AC-3 encoder private context |
| 1831 | */ |
| 1832 | int ff_ac3_validate_metadata(AC3EncodeContext *s) |
| 1833 | { |
| 1834 | AVCodecContext *avctx = s->avctx; |
| 1835 | AC3EncOptions *opt = &s->options; |
| 1836 | |
| 1837 | opt->audio_production_info = 0; |
| 1838 | opt->extended_bsi_1 = 0; |
| 1839 | opt->extended_bsi_2 = 0; |
| 1840 | opt->eac3_mixing_metadata = 0; |
| 1841 | opt->eac3_info_metadata = 0; |
| 1842 | |
| 1843 | /* determine mixing metadata / xbsi1 use */ |
| 1844 | if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) { |
| 1845 | opt->extended_bsi_1 = 1; |
| 1846 | opt->eac3_mixing_metadata = 1; |
| 1847 | } |
| 1848 | if (s->has_center && |
| 1849 | (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) { |
| 1850 | opt->extended_bsi_1 = 1; |
| 1851 | opt->eac3_mixing_metadata = 1; |
| 1852 | } |
| 1853 | if (s->has_surround && |
| 1854 | (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) { |
| 1855 | opt->extended_bsi_1 = 1; |
| 1856 | opt->eac3_mixing_metadata = 1; |
| 1857 | } |
| 1858 | |
| 1859 | if (s->eac3) { |
| 1860 | /* determine info metadata use */ |
| 1861 | if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN) |
| 1862 | opt->eac3_info_metadata = 1; |
| 1863 | if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE) |
| 1864 | opt->eac3_info_metadata = 1; |
| 1865 | if (s->channel_mode == AC3_CHMODE_STEREO && |
| 1866 | (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE)) |
| 1867 | opt->eac3_info_metadata = 1; |
| 1868 | if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) |
| 1869 | opt->eac3_info_metadata = 1; |
| 1870 | if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE || |
| 1871 | opt->ad_converter_type != AC3ENC_OPT_NONE) { |
| 1872 | opt->audio_production_info = 1; |
| 1873 | opt->eac3_info_metadata = 1; |
| 1874 | } |
| 1875 | } else { |
| 1876 | /* determine audio production info use */ |
| 1877 | if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE) |
| 1878 | opt->audio_production_info = 1; |
| 1879 | |
| 1880 | /* determine xbsi2 use */ |
| 1881 | if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE) |
| 1882 | opt->extended_bsi_2 = 1; |
| 1883 | if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE) |
| 1884 | opt->extended_bsi_2 = 1; |
| 1885 | if (opt->ad_converter_type != AC3ENC_OPT_NONE) |
| 1886 | opt->extended_bsi_2 = 1; |
| 1887 | } |
| 1888 | |
| 1889 | /* validate AC-3 mixing levels */ |
| 1890 | if (!s->eac3) { |
| 1891 | if (s->has_center) { |
| 1892 | validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level, |
| 1893 | cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0, |
| 1894 | &s->center_mix_level); |
| 1895 | } |
| 1896 | if (s->has_surround) { |
| 1897 | validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level, |
| 1898 | surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0, |
| 1899 | &s->surround_mix_level); |
| 1900 | } |
| 1901 | } |
| 1902 | |
| 1903 | /* validate extended bsi 1 / mixing metadata */ |
| 1904 | if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) { |
| 1905 | /* default preferred stereo downmix */ |
| 1906 | if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE) |
| 1907 | opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED; |
| 1908 | if (!s->eac3 || s->has_center) { |
| 1909 | /* validate Lt/Rt center mix level */ |
| 1910 | validate_mix_level(avctx, "ltrt_center_mix_level", |
| 1911 | &opt->ltrt_center_mix_level, extmixlev_options, |
| 1912 | EXTMIXLEV_NUM_OPTIONS, 5, 0, |
| 1913 | &s->ltrt_center_mix_level); |
| 1914 | /* validate Lo/Ro center mix level */ |
| 1915 | validate_mix_level(avctx, "loro_center_mix_level", |
| 1916 | &opt->loro_center_mix_level, extmixlev_options, |
| 1917 | EXTMIXLEV_NUM_OPTIONS, 5, 0, |
| 1918 | &s->loro_center_mix_level); |
| 1919 | } |
| 1920 | if (!s->eac3 || s->has_surround) { |
| 1921 | /* validate Lt/Rt surround mix level */ |
| 1922 | validate_mix_level(avctx, "ltrt_surround_mix_level", |
| 1923 | &opt->ltrt_surround_mix_level, extmixlev_options, |
| 1924 | EXTMIXLEV_NUM_OPTIONS, 6, 3, |
| 1925 | &s->ltrt_surround_mix_level); |
| 1926 | /* validate Lo/Ro surround mix level */ |
| 1927 | validate_mix_level(avctx, "loro_surround_mix_level", |
| 1928 | &opt->loro_surround_mix_level, extmixlev_options, |
| 1929 | EXTMIXLEV_NUM_OPTIONS, 6, 3, |
| 1930 | &s->loro_surround_mix_level); |
| 1931 | } |
| 1932 | } |
| 1933 | |
| 1934 | /* validate audio service type / channels combination */ |
| 1935 | if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE && |
| 1936 | avctx->channels == 1) || |
| 1937 | ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY || |
| 1938 | avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY || |
| 1939 | avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER) |
| 1940 | && avctx->channels > 1)) { |
| 1941 | av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the " |
| 1942 | "specified number of channels\n"); |
| 1943 | return AVERROR(EINVAL); |
| 1944 | } |
| 1945 | |
| 1946 | /* validate extended bsi 2 / info metadata */ |
| 1947 | if (opt->extended_bsi_2 || opt->eac3_info_metadata) { |
| 1948 | /* default dolby headphone mode */ |
| 1949 | if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE) |
| 1950 | opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED; |
| 1951 | /* default dolby surround ex mode */ |
| 1952 | if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE) |
| 1953 | opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED; |
| 1954 | /* default A/D converter type */ |
| 1955 | if (opt->ad_converter_type == AC3ENC_OPT_NONE) |
| 1956 | opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD; |
| 1957 | } |
| 1958 | |
| 1959 | /* copyright & original defaults */ |
| 1960 | if (!s->eac3 || opt->eac3_info_metadata) { |
| 1961 | /* default copyright */ |
| 1962 | if (opt->copyright == AC3ENC_OPT_NONE) |
| 1963 | opt->copyright = AC3ENC_OPT_OFF; |
| 1964 | /* default original */ |
| 1965 | if (opt->original == AC3ENC_OPT_NONE) |
| 1966 | opt->original = AC3ENC_OPT_ON; |
| 1967 | } |
| 1968 | |
| 1969 | /* dolby surround mode default */ |
| 1970 | if (!s->eac3 || opt->eac3_info_metadata) { |
| 1971 | if (opt->dolby_surround_mode == AC3ENC_OPT_NONE) |
| 1972 | opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED; |
| 1973 | } |
| 1974 | |
| 1975 | /* validate audio production info */ |
| 1976 | if (opt->audio_production_info) { |
| 1977 | if (opt->mixing_level == AC3ENC_OPT_NONE) { |
| 1978 | av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if " |
| 1979 | "room_type is set\n"); |
| 1980 | return AVERROR(EINVAL); |
| 1981 | } |
| 1982 | if (opt->mixing_level < 80) { |
| 1983 | av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between " |
| 1984 | "80dB and 111dB\n"); |
| 1985 | return AVERROR(EINVAL); |
| 1986 | } |
| 1987 | /* default room type */ |
| 1988 | if (opt->room_type == AC3ENC_OPT_NONE) |
| 1989 | opt->room_type = AC3ENC_OPT_NOT_INDICATED; |
| 1990 | } |
| 1991 | |
| 1992 | /* set bitstream id for alternate bitstream syntax */ |
| 1993 | if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) { |
| 1994 | if (s->bitstream_id > 8 && s->bitstream_id < 11) { |
| 1995 | static int warn_once = 1; |
| 1996 | if (warn_once) { |
| 1997 | av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is " |
| 1998 | "not compatible with reduced samplerates. writing of " |
| 1999 | "extended bitstream information will be disabled.\n"); |
| 2000 | warn_once = 0; |
| 2001 | } |
| 2002 | } else { |
| 2003 | s->bitstream_id = 6; |
| 2004 | } |
| 2005 | } |
| 2006 | |
| 2007 | return 0; |
| 2008 | } |
| 2009 | |
| 2010 | |
| 2011 | /** |
| 2012 | * Finalize encoding and free any memory allocated by the encoder. |
| 2013 | * |
| 2014 | * @param avctx Codec context |
| 2015 | */ |
| 2016 | av_cold int ff_ac3_encode_close(AVCodecContext *avctx) |
| 2017 | { |
| 2018 | int blk, ch; |
| 2019 | AC3EncodeContext *s = avctx->priv_data; |
| 2020 | |
| 2021 | av_freep(&s->windowed_samples); |
| 2022 | if (s->planar_samples) |
| 2023 | for (ch = 0; ch < s->channels; ch++) |
| 2024 | av_freep(&s->planar_samples[ch]); |
| 2025 | av_freep(&s->planar_samples); |
| 2026 | av_freep(&s->bap_buffer); |
| 2027 | av_freep(&s->bap1_buffer); |
| 2028 | av_freep(&s->mdct_coef_buffer); |
| 2029 | av_freep(&s->fixed_coef_buffer); |
| 2030 | av_freep(&s->exp_buffer); |
| 2031 | av_freep(&s->grouped_exp_buffer); |
| 2032 | av_freep(&s->psd_buffer); |
| 2033 | av_freep(&s->band_psd_buffer); |
| 2034 | av_freep(&s->mask_buffer); |
| 2035 | av_freep(&s->qmant_buffer); |
| 2036 | av_freep(&s->cpl_coord_exp_buffer); |
| 2037 | av_freep(&s->cpl_coord_mant_buffer); |
| 2038 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 2039 | AC3Block *block = &s->blocks[blk]; |
| 2040 | av_freep(&block->mdct_coef); |
| 2041 | av_freep(&block->fixed_coef); |
| 2042 | av_freep(&block->exp); |
| 2043 | av_freep(&block->grouped_exp); |
| 2044 | av_freep(&block->psd); |
| 2045 | av_freep(&block->band_psd); |
| 2046 | av_freep(&block->mask); |
| 2047 | av_freep(&block->qmant); |
| 2048 | av_freep(&block->cpl_coord_exp); |
| 2049 | av_freep(&block->cpl_coord_mant); |
| 2050 | } |
| 2051 | |
| 2052 | s->mdct_end(s); |
| 2053 | |
| 2054 | return 0; |
| 2055 | } |
| 2056 | |
| 2057 | |
| 2058 | /* |
| 2059 | * Set channel information during initialization. |
| 2060 | */ |
| 2061 | static av_cold int set_channel_info(AC3EncodeContext *s, int channels, |
| 2062 | uint64_t *channel_layout) |
| 2063 | { |
| 2064 | int ch_layout; |
| 2065 | |
| 2066 | if (channels < 1 || channels > AC3_MAX_CHANNELS) |
| 2067 | return AVERROR(EINVAL); |
| 2068 | if (*channel_layout > 0x7FF) |
| 2069 | return AVERROR(EINVAL); |
| 2070 | ch_layout = *channel_layout; |
| 2071 | if (!ch_layout) |
| 2072 | ch_layout = av_get_default_channel_layout(channels); |
| 2073 | |
| 2074 | s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY); |
| 2075 | s->channels = channels; |
| 2076 | s->fbw_channels = channels - s->lfe_on; |
| 2077 | s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1; |
| 2078 | if (s->lfe_on) |
| 2079 | ch_layout -= AV_CH_LOW_FREQUENCY; |
| 2080 | |
| 2081 | switch (ch_layout) { |
| 2082 | case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break; |
| 2083 | case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break; |
| 2084 | case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break; |
| 2085 | case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break; |
| 2086 | case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break; |
| 2087 | case AV_CH_LAYOUT_QUAD: |
| 2088 | case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break; |
| 2089 | case AV_CH_LAYOUT_5POINT0: |
| 2090 | case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break; |
| 2091 | default: |
| 2092 | return AVERROR(EINVAL); |
| 2093 | } |
| 2094 | s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO; |
| 2095 | s->has_surround = s->channel_mode & 0x04; |
| 2096 | |
| 2097 | s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on]; |
| 2098 | *channel_layout = ch_layout; |
| 2099 | if (s->lfe_on) |
| 2100 | *channel_layout |= AV_CH_LOW_FREQUENCY; |
| 2101 | |
| 2102 | return 0; |
| 2103 | } |
| 2104 | |
| 2105 | |
| 2106 | static av_cold int validate_options(AC3EncodeContext *s) |
| 2107 | { |
| 2108 | AVCodecContext *avctx = s->avctx; |
| 2109 | int i, ret, max_sr; |
| 2110 | |
| 2111 | /* validate channel layout */ |
| 2112 | if (!avctx->channel_layout) { |
| 2113 | av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " |
| 2114 | "encoder will guess the layout, but it " |
| 2115 | "might be incorrect.\n"); |
| 2116 | } |
| 2117 | ret = set_channel_info(s, avctx->channels, &avctx->channel_layout); |
| 2118 | if (ret) { |
| 2119 | av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n"); |
| 2120 | return ret; |
| 2121 | } |
| 2122 | |
| 2123 | /* validate sample rate */ |
| 2124 | /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a |
| 2125 | decoder that supports half sample rate so we can validate that |
| 2126 | the generated files are correct. */ |
| 2127 | max_sr = s->eac3 ? 2 : 8; |
| 2128 | for (i = 0; i <= max_sr; i++) { |
| 2129 | if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate) |
| 2130 | break; |
| 2131 | } |
| 2132 | if (i > max_sr) { |
| 2133 | av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); |
| 2134 | return AVERROR(EINVAL); |
| 2135 | } |
| 2136 | s->sample_rate = avctx->sample_rate; |
| 2137 | s->bit_alloc.sr_shift = i / 3; |
| 2138 | s->bit_alloc.sr_code = i % 3; |
| 2139 | s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift; |
| 2140 | |
| 2141 | /* select a default bit rate if not set by the user */ |
| 2142 | if (!avctx->bit_rate) { |
| 2143 | switch (s->fbw_channels) { |
| 2144 | case 1: avctx->bit_rate = 96000; break; |
| 2145 | case 2: avctx->bit_rate = 192000; break; |
| 2146 | case 3: avctx->bit_rate = 320000; break; |
| 2147 | case 4: avctx->bit_rate = 384000; break; |
| 2148 | case 5: avctx->bit_rate = 448000; break; |
| 2149 | } |
| 2150 | } |
| 2151 | |
| 2152 | /* validate bit rate */ |
| 2153 | if (s->eac3) { |
| 2154 | int max_br, min_br, wpf, min_br_dist, min_br_code; |
| 2155 | int num_blks_code, num_blocks, frame_samples; |
| 2156 | |
| 2157 | /* calculate min/max bitrate */ |
| 2158 | /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've |
| 2159 | found use either 6 blocks or 1 block, even though 2 or 3 blocks |
| 2160 | would work as far as the bit rate is concerned. */ |
| 2161 | for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) { |
| 2162 | num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code]; |
| 2163 | frame_samples = AC3_BLOCK_SIZE * num_blocks; |
| 2164 | max_br = 2048 * s->sample_rate / frame_samples * 16; |
| 2165 | min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16; |
| 2166 | if (avctx->bit_rate <= max_br) |
| 2167 | break; |
| 2168 | } |
| 2169 | if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) { |
| 2170 | av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d " |
| 2171 | "for this sample rate\n", min_br, max_br); |
| 2172 | return AVERROR(EINVAL); |
| 2173 | } |
| 2174 | s->num_blks_code = num_blks_code; |
| 2175 | s->num_blocks = num_blocks; |
| 2176 | |
| 2177 | /* calculate words-per-frame for the selected bitrate */ |
| 2178 | wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate; |
| 2179 | av_assert1(wpf > 0 && wpf <= 2048); |
| 2180 | |
| 2181 | /* find the closest AC-3 bitrate code to the selected bitrate. |
| 2182 | this is needed for lookup tables for bandwidth and coupling |
| 2183 | parameter selection */ |
| 2184 | min_br_code = -1; |
| 2185 | min_br_dist = INT_MAX; |
| 2186 | for (i = 0; i < 19; i++) { |
| 2187 | int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate); |
| 2188 | if (br_dist < min_br_dist) { |
| 2189 | min_br_dist = br_dist; |
| 2190 | min_br_code = i; |
| 2191 | } |
| 2192 | } |
| 2193 | |
| 2194 | /* make sure the minimum frame size is below the average frame size */ |
| 2195 | s->frame_size_code = min_br_code << 1; |
| 2196 | while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate) |
| 2197 | wpf--; |
| 2198 | s->frame_size_min = 2 * wpf; |
| 2199 | } else { |
| 2200 | int best_br = 0, best_code = 0, best_diff = INT_MAX; |
| 2201 | for (i = 0; i < 19; i++) { |
| 2202 | int br = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000; |
| 2203 | int diff = abs(br - avctx->bit_rate); |
| 2204 | if (diff < best_diff) { |
| 2205 | best_br = br; |
| 2206 | best_code = i; |
| 2207 | best_diff = diff; |
| 2208 | } |
| 2209 | if (!best_diff) |
| 2210 | break; |
| 2211 | } |
| 2212 | avctx->bit_rate = best_br; |
| 2213 | s->frame_size_code = best_code << 1; |
| 2214 | s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code]; |
| 2215 | s->num_blks_code = 0x3; |
| 2216 | s->num_blocks = 6; |
| 2217 | } |
| 2218 | s->bit_rate = avctx->bit_rate; |
| 2219 | s->frame_size = s->frame_size_min; |
| 2220 | |
| 2221 | /* validate cutoff */ |
| 2222 | if (avctx->cutoff < 0) { |
| 2223 | av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n"); |
| 2224 | return AVERROR(EINVAL); |
| 2225 | } |
| 2226 | s->cutoff = avctx->cutoff; |
| 2227 | if (s->cutoff > (s->sample_rate >> 1)) |
| 2228 | s->cutoff = s->sample_rate >> 1; |
| 2229 | |
| 2230 | ret = ff_ac3_validate_metadata(s); |
| 2231 | if (ret) |
| 2232 | return ret; |
| 2233 | |
| 2234 | s->rematrixing_enabled = s->options.stereo_rematrixing && |
| 2235 | (s->channel_mode == AC3_CHMODE_STEREO); |
| 2236 | |
| 2237 | s->cpl_enabled = s->options.channel_coupling && |
| 2238 | s->channel_mode >= AC3_CHMODE_STEREO; |
| 2239 | |
| 2240 | return 0; |
| 2241 | } |
| 2242 | |
| 2243 | |
| 2244 | /* |
| 2245 | * Set bandwidth for all channels. |
| 2246 | * The user can optionally supply a cutoff frequency. Otherwise an appropriate |
| 2247 | * default value will be used. |
| 2248 | */ |
| 2249 | static av_cold void set_bandwidth(AC3EncodeContext *s) |
| 2250 | { |
| 2251 | int blk, ch, av_uninit(cpl_start); |
| 2252 | |
| 2253 | if (s->cutoff) { |
| 2254 | /* calculate bandwidth based on user-specified cutoff frequency */ |
| 2255 | int fbw_coeffs; |
| 2256 | fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; |
| 2257 | s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60); |
| 2258 | } else { |
| 2259 | /* use default bandwidth setting */ |
| 2260 | s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2]; |
| 2261 | } |
| 2262 | |
| 2263 | /* set number of coefficients for each channel */ |
| 2264 | for (ch = 1; ch <= s->fbw_channels; ch++) { |
| 2265 | s->start_freq[ch] = 0; |
| 2266 | for (blk = 0; blk < s->num_blocks; blk++) |
| 2267 | s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73; |
| 2268 | } |
| 2269 | /* LFE channel always has 7 coefs */ |
| 2270 | if (s->lfe_on) { |
| 2271 | s->start_freq[s->lfe_channel] = 0; |
| 2272 | for (blk = 0; blk < s->num_blocks; blk++) |
| 2273 | s->blocks[blk].end_freq[ch] = 7; |
| 2274 | } |
| 2275 | |
| 2276 | /* initialize coupling strategy */ |
| 2277 | if (s->cpl_enabled) { |
| 2278 | if (s->options.cpl_start != AC3ENC_OPT_AUTO) { |
| 2279 | cpl_start = s->options.cpl_start; |
| 2280 | } else { |
| 2281 | cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2]; |
| 2282 | if (cpl_start < 0) { |
| 2283 | if (s->options.channel_coupling == AC3ENC_OPT_AUTO) |
| 2284 | s->cpl_enabled = 0; |
| 2285 | else |
| 2286 | cpl_start = 15; |
| 2287 | } |
| 2288 | } |
| 2289 | } |
| 2290 | if (s->cpl_enabled) { |
| 2291 | int i, cpl_start_band, cpl_end_band; |
| 2292 | uint8_t *cpl_band_sizes = s->cpl_band_sizes; |
| 2293 | |
| 2294 | cpl_end_band = s->bandwidth_code / 4 + 3; |
| 2295 | cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15)); |
| 2296 | |
| 2297 | s->num_cpl_subbands = cpl_end_band - cpl_start_band; |
| 2298 | |
| 2299 | s->num_cpl_bands = 1; |
| 2300 | *cpl_band_sizes = 12; |
| 2301 | for (i = cpl_start_band + 1; i < cpl_end_band; i++) { |
| 2302 | if (ff_eac3_default_cpl_band_struct[i]) { |
| 2303 | *cpl_band_sizes += 12; |
| 2304 | } else { |
| 2305 | s->num_cpl_bands++; |
| 2306 | cpl_band_sizes++; |
| 2307 | *cpl_band_sizes = 12; |
| 2308 | } |
| 2309 | } |
| 2310 | |
| 2311 | s->start_freq[CPL_CH] = cpl_start_band * 12 + 37; |
| 2312 | s->cpl_end_freq = cpl_end_band * 12 + 37; |
| 2313 | for (blk = 0; blk < s->num_blocks; blk++) |
| 2314 | s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq; |
| 2315 | } |
| 2316 | } |
| 2317 | |
| 2318 | |
| 2319 | static av_cold int allocate_buffers(AC3EncodeContext *s) |
| 2320 | { |
| 2321 | AVCodecContext *avctx = s->avctx; |
| 2322 | int blk, ch; |
| 2323 | int channels = s->channels + 1; /* includes coupling channel */ |
| 2324 | int channel_blocks = channels * s->num_blocks; |
| 2325 | int total_coefs = AC3_MAX_COEFS * channel_blocks; |
| 2326 | |
| 2327 | if (s->allocate_sample_buffers(s)) |
| 2328 | goto alloc_fail; |
| 2329 | |
| 2330 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap_buffer, total_coefs, |
| 2331 | sizeof(*s->bap_buffer), alloc_fail); |
| 2332 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->bap1_buffer, total_coefs, |
| 2333 | sizeof(*s->bap1_buffer), alloc_fail); |
| 2334 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs, |
| 2335 | sizeof(*s->mdct_coef_buffer), alloc_fail); |
| 2336 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->exp_buffer, total_coefs, |
| 2337 | sizeof(*s->exp_buffer), alloc_fail); |
| 2338 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks, 128 * |
| 2339 | sizeof(*s->grouped_exp_buffer), alloc_fail); |
| 2340 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->psd_buffer, total_coefs, |
| 2341 | sizeof(*s->psd_buffer), alloc_fail); |
| 2342 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks, 64 * |
| 2343 | sizeof(*s->band_psd_buffer), alloc_fail); |
| 2344 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->mask_buffer, channel_blocks, 64 * |
| 2345 | sizeof(*s->mask_buffer), alloc_fail); |
| 2346 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->qmant_buffer, total_coefs, |
| 2347 | sizeof(*s->qmant_buffer), alloc_fail); |
| 2348 | if (s->cpl_enabled) { |
| 2349 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks, 16 * |
| 2350 | sizeof(*s->cpl_coord_exp_buffer), alloc_fail); |
| 2351 | FF_ALLOC_ARRAY_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks, 16 * |
| 2352 | sizeof(*s->cpl_coord_mant_buffer), alloc_fail); |
| 2353 | } |
| 2354 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 2355 | AC3Block *block = &s->blocks[blk]; |
| 2356 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mdct_coef, channels, sizeof(*block->mdct_coef), |
| 2357 | alloc_fail); |
| 2358 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->exp, channels, sizeof(*block->exp), |
| 2359 | alloc_fail); |
| 2360 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->grouped_exp, channels, sizeof(*block->grouped_exp), |
| 2361 | alloc_fail); |
| 2362 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->psd, channels, sizeof(*block->psd), |
| 2363 | alloc_fail); |
| 2364 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->band_psd, channels, sizeof(*block->band_psd), |
| 2365 | alloc_fail); |
| 2366 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->mask, channels, sizeof(*block->mask), |
| 2367 | alloc_fail); |
| 2368 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->qmant, channels, sizeof(*block->qmant), |
| 2369 | alloc_fail); |
| 2370 | if (s->cpl_enabled) { |
| 2371 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_exp, channels, sizeof(*block->cpl_coord_exp), |
| 2372 | alloc_fail); |
| 2373 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->cpl_coord_mant, channels, sizeof(*block->cpl_coord_mant), |
| 2374 | alloc_fail); |
| 2375 | } |
| 2376 | |
| 2377 | for (ch = 0; ch < channels; ch++) { |
| 2378 | /* arrangement: block, channel, coeff */ |
| 2379 | block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)]; |
| 2380 | block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; |
| 2381 | block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)]; |
| 2382 | block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)]; |
| 2383 | block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)]; |
| 2384 | if (s->cpl_enabled) { |
| 2385 | block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)]; |
| 2386 | block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)]; |
| 2387 | } |
| 2388 | |
| 2389 | /* arrangement: channel, block, coeff */ |
| 2390 | block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; |
| 2391 | block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; |
| 2392 | } |
| 2393 | } |
| 2394 | |
| 2395 | if (!s->fixed_point) { |
| 2396 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs, |
| 2397 | sizeof(*s->fixed_coef_buffer), alloc_fail); |
| 2398 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 2399 | AC3Block *block = &s->blocks[blk]; |
| 2400 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels, |
| 2401 | sizeof(*block->fixed_coef), alloc_fail); |
| 2402 | for (ch = 0; ch < channels; ch++) |
| 2403 | block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)]; |
| 2404 | } |
| 2405 | } else { |
| 2406 | for (blk = 0; blk < s->num_blocks; blk++) { |
| 2407 | AC3Block *block = &s->blocks[blk]; |
| 2408 | FF_ALLOCZ_ARRAY_OR_GOTO(avctx, block->fixed_coef, channels, |
| 2409 | sizeof(*block->fixed_coef), alloc_fail); |
| 2410 | for (ch = 0; ch < channels; ch++) |
| 2411 | block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch]; |
| 2412 | } |
| 2413 | } |
| 2414 | |
| 2415 | return 0; |
| 2416 | alloc_fail: |
| 2417 | return AVERROR(ENOMEM); |
| 2418 | } |
| 2419 | |
| 2420 | |
| 2421 | av_cold int ff_ac3_encode_init(AVCodecContext *avctx) |
| 2422 | { |
| 2423 | AC3EncodeContext *s = avctx->priv_data; |
| 2424 | int ret, frame_size_58; |
| 2425 | |
| 2426 | s->avctx = avctx; |
| 2427 | |
| 2428 | s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3; |
| 2429 | |
| 2430 | ff_ac3_common_init(); |
| 2431 | |
| 2432 | ret = validate_options(s); |
| 2433 | if (ret) |
| 2434 | return ret; |
| 2435 | |
| 2436 | avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks; |
| 2437 | avctx->delay = AC3_BLOCK_SIZE; |
| 2438 | |
| 2439 | s->bitstream_mode = avctx->audio_service_type; |
| 2440 | if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE) |
| 2441 | s->bitstream_mode = 0x7; |
| 2442 | |
| 2443 | s->bits_written = 0; |
| 2444 | s->samples_written = 0; |
| 2445 | |
| 2446 | /* calculate crc_inv for both possible frame sizes */ |
| 2447 | frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1; |
| 2448 | s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); |
| 2449 | if (s->bit_alloc.sr_code == 1) { |
| 2450 | frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1; |
| 2451 | s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY); |
| 2452 | } |
| 2453 | |
| 2454 | /* set function pointers */ |
| 2455 | if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) { |
| 2456 | s->mdct_end = ff_ac3_fixed_mdct_end; |
| 2457 | s->mdct_init = ff_ac3_fixed_mdct_init; |
| 2458 | s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers; |
| 2459 | } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) { |
| 2460 | s->mdct_end = ff_ac3_float_mdct_end; |
| 2461 | s->mdct_init = ff_ac3_float_mdct_init; |
| 2462 | s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers; |
| 2463 | } |
| 2464 | if (CONFIG_EAC3_ENCODER && s->eac3) |
| 2465 | s->output_frame_header = ff_eac3_output_frame_header; |
| 2466 | else |
| 2467 | s->output_frame_header = ac3_output_frame_header; |
| 2468 | |
| 2469 | set_bandwidth(s); |
| 2470 | |
| 2471 | exponent_init(s); |
| 2472 | |
| 2473 | bit_alloc_init(s); |
| 2474 | |
| 2475 | ret = s->mdct_init(s); |
| 2476 | if (ret) |
| 2477 | goto init_fail; |
| 2478 | |
| 2479 | ret = allocate_buffers(s); |
| 2480 | if (ret) |
| 2481 | goto init_fail; |
| 2482 | |
| 2483 | ff_audiodsp_init(&s->adsp); |
| 2484 | ff_me_cmp_init(&s->mecc, avctx); |
| 2485 | ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT); |
| 2486 | |
| 2487 | dprint_options(s); |
| 2488 | |
| 2489 | return 0; |
| 2490 | init_fail: |
| 2491 | ff_ac3_encode_close(avctx); |
| 2492 | return ret; |
| 2493 | } |