| 1 | /* |
| 2 | * DCA encoder |
| 3 | * Copyright (C) 2008-2012 Alexander E. Patrakov |
| 4 | * 2010 Benjamin Larsson |
| 5 | * 2011 Xiang Wang |
| 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 | #include "libavutil/avassert.h" |
| 25 | #include "libavutil/channel_layout.h" |
| 26 | #include "libavutil/common.h" |
| 27 | #include "avcodec.h" |
| 28 | #include "dca.h" |
| 29 | #include "dcadata.h" |
| 30 | #include "dcaenc.h" |
| 31 | #include "internal.h" |
| 32 | #include "mathops.h" |
| 33 | #include "put_bits.h" |
| 34 | |
| 35 | #define MAX_CHANNELS 6 |
| 36 | #define DCA_MAX_FRAME_SIZE 16384 |
| 37 | #define DCA_HEADER_SIZE 13 |
| 38 | #define DCA_LFE_SAMPLES 8 |
| 39 | |
| 40 | #define DCA_SUBBANDS 32 |
| 41 | #define SUBFRAMES 1 |
| 42 | #define SUBSUBFRAMES 2 |
| 43 | #define SUBBAND_SAMPLES (SUBFRAMES * SUBSUBFRAMES * 8) |
| 44 | #define AUBANDS 25 |
| 45 | |
| 46 | typedef struct DCAContext { |
| 47 | PutBitContext pb; |
| 48 | int frame_size; |
| 49 | int frame_bits; |
| 50 | int fullband_channels; |
| 51 | int channels; |
| 52 | int lfe_channel; |
| 53 | int samplerate_index; |
| 54 | int bitrate_index; |
| 55 | int channel_config; |
| 56 | const int32_t *band_interpolation; |
| 57 | const int32_t *band_spectrum; |
| 58 | int lfe_scale_factor; |
| 59 | softfloat lfe_quant; |
| 60 | int32_t lfe_peak_cb; |
| 61 | |
| 62 | int32_t history[512][MAX_CHANNELS]; /* This is a circular buffer */ |
| 63 | int32_t subband[SUBBAND_SAMPLES][DCA_SUBBANDS][MAX_CHANNELS]; |
| 64 | int32_t quantized[SUBBAND_SAMPLES][DCA_SUBBANDS][MAX_CHANNELS]; |
| 65 | int32_t peak_cb[DCA_SUBBANDS][MAX_CHANNELS]; |
| 66 | int32_t downsampled_lfe[DCA_LFE_SAMPLES]; |
| 67 | int32_t masking_curve_cb[SUBSUBFRAMES][256]; |
| 68 | int abits[DCA_SUBBANDS][MAX_CHANNELS]; |
| 69 | int scale_factor[DCA_SUBBANDS][MAX_CHANNELS]; |
| 70 | softfloat quant[DCA_SUBBANDS][MAX_CHANNELS]; |
| 71 | int32_t eff_masking_curve_cb[256]; |
| 72 | int32_t band_masking_cb[32]; |
| 73 | int32_t worst_quantization_noise; |
| 74 | int32_t worst_noise_ever; |
| 75 | int consumed_bits; |
| 76 | } DCAContext; |
| 77 | |
| 78 | static int32_t cos_table[2048]; |
| 79 | static int32_t band_interpolation[2][512]; |
| 80 | static int32_t band_spectrum[2][8]; |
| 81 | static int32_t auf[9][AUBANDS][256]; |
| 82 | static int32_t cb_to_add[256]; |
| 83 | static int32_t cb_to_level[2048]; |
| 84 | static int32_t lfe_fir_64i[512]; |
| 85 | |
| 86 | /* Transfer function of outer and middle ear, Hz -> dB */ |
| 87 | static double hom(double f) |
| 88 | { |
| 89 | double f1 = f / 1000; |
| 90 | |
| 91 | return -3.64 * pow(f1, -0.8) |
| 92 | + 6.8 * exp(-0.6 * (f1 - 3.4) * (f1 - 3.4)) |
| 93 | - 6.0 * exp(-0.15 * (f1 - 8.7) * (f1 - 8.7)) |
| 94 | - 0.0006 * (f1 * f1) * (f1 * f1); |
| 95 | } |
| 96 | |
| 97 | static double gammafilter(int i, double f) |
| 98 | { |
| 99 | double h = (f - fc[i]) / erb[i]; |
| 100 | |
| 101 | h = 1 + h * h; |
| 102 | h = 1 / (h * h); |
| 103 | return 20 * log10(h); |
| 104 | } |
| 105 | |
| 106 | static int encode_init(AVCodecContext *avctx) |
| 107 | { |
| 108 | DCAContext *c = avctx->priv_data; |
| 109 | uint64_t layout = avctx->channel_layout; |
| 110 | int i, min_frame_bits; |
| 111 | |
| 112 | c->fullband_channels = c->channels = avctx->channels; |
| 113 | c->lfe_channel = (avctx->channels == 3 || avctx->channels == 6); |
| 114 | c->band_interpolation = band_interpolation[1]; |
| 115 | c->band_spectrum = band_spectrum[1]; |
| 116 | c->worst_quantization_noise = -2047; |
| 117 | c->worst_noise_ever = -2047; |
| 118 | |
| 119 | if (!layout) { |
| 120 | av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The " |
| 121 | "encoder will guess the layout, but it " |
| 122 | "might be incorrect.\n"); |
| 123 | layout = av_get_default_channel_layout(avctx->channels); |
| 124 | } |
| 125 | switch (layout) { |
| 126 | case AV_CH_LAYOUT_MONO: c->channel_config = 0; break; |
| 127 | case AV_CH_LAYOUT_STEREO: c->channel_config = 2; break; |
| 128 | case AV_CH_LAYOUT_2_2: c->channel_config = 8; break; |
| 129 | case AV_CH_LAYOUT_5POINT0: c->channel_config = 9; break; |
| 130 | case AV_CH_LAYOUT_5POINT1: c->channel_config = 9; break; |
| 131 | default: |
| 132 | av_log(avctx, AV_LOG_ERROR, "Unsupported channel layout!\n"); |
| 133 | return AVERROR_PATCHWELCOME; |
| 134 | } |
| 135 | |
| 136 | if (c->lfe_channel) |
| 137 | c->fullband_channels--; |
| 138 | |
| 139 | for (i = 0; i < 9; i++) { |
| 140 | if (sample_rates[i] == avctx->sample_rate) |
| 141 | break; |
| 142 | } |
| 143 | if (i == 9) |
| 144 | return AVERROR(EINVAL); |
| 145 | c->samplerate_index = i; |
| 146 | |
| 147 | if (avctx->bit_rate < 32000 || avctx->bit_rate > 3840000) { |
| 148 | av_log(avctx, AV_LOG_ERROR, "Bit rate %i not supported.", avctx->bit_rate); |
| 149 | return AVERROR(EINVAL); |
| 150 | } |
| 151 | for (i = 0; dca_bit_rates[i] < avctx->bit_rate; i++) |
| 152 | ; |
| 153 | c->bitrate_index = i; |
| 154 | avctx->bit_rate = dca_bit_rates[i]; |
| 155 | c->frame_bits = FFALIGN((avctx->bit_rate * 512 + avctx->sample_rate - 1) / avctx->sample_rate, 32); |
| 156 | min_frame_bits = 132 + (493 + 28 * 32) * c->fullband_channels + c->lfe_channel * 72; |
| 157 | if (c->frame_bits < min_frame_bits || c->frame_bits > (DCA_MAX_FRAME_SIZE << 3)) |
| 158 | return AVERROR(EINVAL); |
| 159 | |
| 160 | c->frame_size = (c->frame_bits + 7) / 8; |
| 161 | |
| 162 | avctx->frame_size = 32 * SUBBAND_SAMPLES; |
| 163 | |
| 164 | if (!cos_table[0]) { |
| 165 | int j, k; |
| 166 | |
| 167 | for (i = 0; i < 2048; i++) { |
| 168 | cos_table[i] = (int32_t)(0x7fffffff * cos(M_PI * i / 1024)); |
| 169 | cb_to_level[i] = (int32_t)(0x7fffffff * pow(10, -0.005 * i)); |
| 170 | } |
| 171 | |
| 172 | /* FIXME: probably incorrect */ |
| 173 | for (i = 0; i < 256; i++) { |
| 174 | lfe_fir_64i[i] = (int32_t)(0x01ffffff * lfe_fir_64[i]); |
| 175 | lfe_fir_64i[511 - i] = (int32_t)(0x01ffffff * lfe_fir_64[i]); |
| 176 | } |
| 177 | |
| 178 | for (i = 0; i < 512; i++) { |
| 179 | band_interpolation[0][i] = (int32_t)(0x1000000000ULL * fir_32bands_perfect[i]); |
| 180 | band_interpolation[1][i] = (int32_t)(0x1000000000ULL * fir_32bands_nonperfect[i]); |
| 181 | } |
| 182 | |
| 183 | for (i = 0; i < 9; i++) { |
| 184 | for (j = 0; j < AUBANDS; j++) { |
| 185 | for (k = 0; k < 256; k++) { |
| 186 | double freq = sample_rates[i] * (k + 0.5) / 512; |
| 187 | |
| 188 | auf[i][j][k] = (int32_t)(10 * (hom(freq) + gammafilter(j, freq))); |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | for (i = 0; i < 256; i++) { |
| 194 | double add = 1 + pow(10, -0.01 * i); |
| 195 | cb_to_add[i] = (int32_t)(100 * log10(add)); |
| 196 | } |
| 197 | for (j = 0; j < 8; j++) { |
| 198 | double accum = 0; |
| 199 | for (i = 0; i < 512; i++) { |
| 200 | double reconst = fir_32bands_perfect[i] * ((i & 64) ? (-1) : 1); |
| 201 | accum += reconst * cos(2 * M_PI * (i + 0.5 - 256) * (j + 0.5) / 512); |
| 202 | } |
| 203 | band_spectrum[0][j] = (int32_t)(200 * log10(accum)); |
| 204 | } |
| 205 | for (j = 0; j < 8; j++) { |
| 206 | double accum = 0; |
| 207 | for (i = 0; i < 512; i++) { |
| 208 | double reconst = fir_32bands_nonperfect[i] * ((i & 64) ? (-1) : 1); |
| 209 | accum += reconst * cos(2 * M_PI * (i + 0.5 - 256) * (j + 0.5) / 512); |
| 210 | } |
| 211 | band_spectrum[1][j] = (int32_t)(200 * log10(accum)); |
| 212 | } |
| 213 | } |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static inline int32_t cos_t(int x) |
| 218 | { |
| 219 | return cos_table[x & 2047]; |
| 220 | } |
| 221 | |
| 222 | static inline int32_t sin_t(int x) |
| 223 | { |
| 224 | return cos_t(x - 512); |
| 225 | } |
| 226 | |
| 227 | static inline int32_t half32(int32_t a) |
| 228 | { |
| 229 | return (a + 1) >> 1; |
| 230 | } |
| 231 | |
| 232 | static inline int32_t mul32(int32_t a, int32_t b) |
| 233 | { |
| 234 | int64_t r = (int64_t)a * b + 0x80000000ULL; |
| 235 | return r >> 32; |
| 236 | } |
| 237 | |
| 238 | static void subband_transform(DCAContext *c, const int32_t *input) |
| 239 | { |
| 240 | int ch, subs, i, k, j; |
| 241 | |
| 242 | for (ch = 0; ch < c->fullband_channels; ch++) { |
| 243 | /* History is copied because it is also needed for PSY */ |
| 244 | int32_t hist[512]; |
| 245 | int hist_start = 0; |
| 246 | |
| 247 | for (i = 0; i < 512; i++) |
| 248 | hist[i] = c->history[i][ch]; |
| 249 | |
| 250 | for (subs = 0; subs < SUBBAND_SAMPLES; subs++) { |
| 251 | int32_t accum[64]; |
| 252 | int32_t resp; |
| 253 | int band; |
| 254 | |
| 255 | /* Calculate the convolutions at once */ |
| 256 | for (i = 0; i < 64; i++) |
| 257 | accum[i] = 0; |
| 258 | |
| 259 | for (k = 0, i = hist_start, j = 0; |
| 260 | i < 512; k = (k + 1) & 63, i++, j++) |
| 261 | accum[k] += mul32(hist[i], c->band_interpolation[j]); |
| 262 | for (i = 0; i < hist_start; k = (k + 1) & 63, i++, j++) |
| 263 | accum[k] += mul32(hist[i], c->band_interpolation[j]); |
| 264 | |
| 265 | for (k = 16; k < 32; k++) |
| 266 | accum[k] = accum[k] - accum[31 - k]; |
| 267 | for (k = 32; k < 48; k++) |
| 268 | accum[k] = accum[k] + accum[95 - k]; |
| 269 | |
| 270 | for (band = 0; band < 32; band++) { |
| 271 | resp = 0; |
| 272 | for (i = 16; i < 48; i++) { |
| 273 | int s = (2 * band + 1) * (2 * (i + 16) + 1); |
| 274 | resp += mul32(accum[i], cos_t(s << 3)) >> 3; |
| 275 | } |
| 276 | |
| 277 | c->subband[subs][band][ch] = ((band + 1) & 2) ? -resp : resp; |
| 278 | } |
| 279 | |
| 280 | /* Copy in 32 new samples from input */ |
| 281 | for (i = 0; i < 32; i++) |
| 282 | hist[i + hist_start] = input[(subs * 32 + i) * c->channels + ch]; |
| 283 | hist_start = (hist_start + 32) & 511; |
| 284 | } |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | static void lfe_downsample(DCAContext *c, const int32_t *input) |
| 289 | { |
| 290 | /* FIXME: make 128x LFE downsampling possible */ |
| 291 | int i, j, lfes; |
| 292 | int32_t hist[512]; |
| 293 | int32_t accum; |
| 294 | int hist_start = 0; |
| 295 | |
| 296 | for (i = 0; i < 512; i++) |
| 297 | hist[i] = c->history[i][c->channels - 1]; |
| 298 | |
| 299 | for (lfes = 0; lfes < DCA_LFE_SAMPLES; lfes++) { |
| 300 | /* Calculate the convolution */ |
| 301 | accum = 0; |
| 302 | |
| 303 | for (i = hist_start, j = 0; i < 512; i++, j++) |
| 304 | accum += mul32(hist[i], lfe_fir_64i[j]); |
| 305 | for (i = 0; i < hist_start; i++, j++) |
| 306 | accum += mul32(hist[i], lfe_fir_64i[j]); |
| 307 | |
| 308 | c->downsampled_lfe[lfes] = accum; |
| 309 | |
| 310 | /* Copy in 64 new samples from input */ |
| 311 | for (i = 0; i < 64; i++) |
| 312 | hist[i + hist_start] = input[(lfes * 64 + i) * c->channels + c->channels - 1]; |
| 313 | |
| 314 | hist_start = (hist_start + 64) & 511; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | typedef struct { |
| 319 | int32_t re; |
| 320 | int32_t im; |
| 321 | } cplx32; |
| 322 | |
| 323 | static void fft(const int32_t in[2 * 256], cplx32 out[256]) |
| 324 | { |
| 325 | cplx32 buf[256], rin[256], rout[256]; |
| 326 | int i, j, k, l; |
| 327 | |
| 328 | /* do two transforms in parallel */ |
| 329 | for (i = 0; i < 256; i++) { |
| 330 | /* Apply the Hann window */ |
| 331 | rin[i].re = mul32(in[2 * i], 0x3fffffff - (cos_t(8 * i + 2) >> 1)); |
| 332 | rin[i].im = mul32(in[2 * i + 1], 0x3fffffff - (cos_t(8 * i + 6) >> 1)); |
| 333 | } |
| 334 | /* pre-rotation */ |
| 335 | for (i = 0; i < 256; i++) { |
| 336 | buf[i].re = mul32(cos_t(4 * i + 2), rin[i].re) |
| 337 | - mul32(sin_t(4 * i + 2), rin[i].im); |
| 338 | buf[i].im = mul32(cos_t(4 * i + 2), rin[i].im) |
| 339 | + mul32(sin_t(4 * i + 2), rin[i].re); |
| 340 | } |
| 341 | |
| 342 | for (j = 256, l = 1; j != 1; j >>= 1, l <<= 1) { |
| 343 | for (k = 0; k < 256; k += j) { |
| 344 | for (i = k; i < k + j / 2; i++) { |
| 345 | cplx32 sum, diff; |
| 346 | int t = 8 * l * i; |
| 347 | |
| 348 | sum.re = buf[i].re + buf[i + j / 2].re; |
| 349 | sum.im = buf[i].im + buf[i + j / 2].im; |
| 350 | |
| 351 | diff.re = buf[i].re - buf[i + j / 2].re; |
| 352 | diff.im = buf[i].im - buf[i + j / 2].im; |
| 353 | |
| 354 | buf[i].re = half32(sum.re); |
| 355 | buf[i].im = half32(sum.im); |
| 356 | |
| 357 | buf[i + j / 2].re = mul32(diff.re, cos_t(t)) |
| 358 | - mul32(diff.im, sin_t(t)); |
| 359 | buf[i + j / 2].im = mul32(diff.im, cos_t(t)) |
| 360 | + mul32(diff.re, sin_t(t)); |
| 361 | } |
| 362 | } |
| 363 | } |
| 364 | /* post-rotation */ |
| 365 | for (i = 0; i < 256; i++) { |
| 366 | int b = ff_reverse[i]; |
| 367 | rout[i].re = mul32(buf[b].re, cos_t(4 * i)) |
| 368 | - mul32(buf[b].im, sin_t(4 * i)); |
| 369 | rout[i].im = mul32(buf[b].im, cos_t(4 * i)) |
| 370 | + mul32(buf[b].re, sin_t(4 * i)); |
| 371 | } |
| 372 | for (i = 0; i < 256; i++) { |
| 373 | /* separate the results of the two transforms */ |
| 374 | cplx32 o1, o2; |
| 375 | |
| 376 | o1.re = rout[i].re - rout[255 - i].re; |
| 377 | o1.im = rout[i].im + rout[255 - i].im; |
| 378 | |
| 379 | o2.re = rout[i].im - rout[255 - i].im; |
| 380 | o2.im = -rout[i].re - rout[255 - i].re; |
| 381 | |
| 382 | /* combine them into one long transform */ |
| 383 | out[i].re = mul32( o1.re + o2.re, cos_t(2 * i + 1)) |
| 384 | + mul32( o1.im - o2.im, sin_t(2 * i + 1)); |
| 385 | out[i].im = mul32( o1.im + o2.im, cos_t(2 * i + 1)) |
| 386 | + mul32(-o1.re + o2.re, sin_t(2 * i + 1)); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | static int32_t get_cb(int32_t in) |
| 391 | { |
| 392 | int i, res; |
| 393 | |
| 394 | res = 0; |
| 395 | if (in < 0) |
| 396 | in = -in; |
| 397 | for (i = 1024; i > 0; i >>= 1) { |
| 398 | if (cb_to_level[i + res] >= in) |
| 399 | res += i; |
| 400 | } |
| 401 | return -res; |
| 402 | } |
| 403 | |
| 404 | static int32_t add_cb(int32_t a, int32_t b) |
| 405 | { |
| 406 | if (a < b) |
| 407 | FFSWAP(int32_t, a, b); |
| 408 | |
| 409 | if (a - b >= 256) |
| 410 | return a; |
| 411 | return a + cb_to_add[a - b]; |
| 412 | } |
| 413 | |
| 414 | static void adjust_jnd(int samplerate_index, |
| 415 | const int32_t in[512], int32_t out_cb[256]) |
| 416 | { |
| 417 | int32_t power[256]; |
| 418 | cplx32 out[256]; |
| 419 | int32_t out_cb_unnorm[256]; |
| 420 | int32_t denom; |
| 421 | const int32_t ca_cb = -1114; |
| 422 | const int32_t cs_cb = 928; |
| 423 | int i, j; |
| 424 | |
| 425 | fft(in, out); |
| 426 | |
| 427 | for (j = 0; j < 256; j++) { |
| 428 | power[j] = add_cb(get_cb(out[j].re), get_cb(out[j].im)); |
| 429 | out_cb_unnorm[j] = -2047; /* and can only grow */ |
| 430 | } |
| 431 | |
| 432 | for (i = 0; i < AUBANDS; i++) { |
| 433 | denom = ca_cb; /* and can only grow */ |
| 434 | for (j = 0; j < 256; j++) |
| 435 | denom = add_cb(denom, power[j] + auf[samplerate_index][i][j]); |
| 436 | for (j = 0; j < 256; j++) |
| 437 | out_cb_unnorm[j] = add_cb(out_cb_unnorm[j], |
| 438 | -denom + auf[samplerate_index][i][j]); |
| 439 | } |
| 440 | |
| 441 | for (j = 0; j < 256; j++) |
| 442 | out_cb[j] = add_cb(out_cb[j], -out_cb_unnorm[j] - ca_cb - cs_cb); |
| 443 | } |
| 444 | |
| 445 | typedef void (*walk_band_t)(DCAContext *c, int band1, int band2, int f, |
| 446 | int32_t spectrum1, int32_t spectrum2, int channel, |
| 447 | int32_t * arg); |
| 448 | |
| 449 | static void walk_band_low(DCAContext *c, int band, int channel, |
| 450 | walk_band_t walk, int32_t *arg) |
| 451 | { |
| 452 | int f; |
| 453 | |
| 454 | if (band == 0) { |
| 455 | for (f = 0; f < 4; f++) |
| 456 | walk(c, 0, 0, f, 0, -2047, channel, arg); |
| 457 | } else { |
| 458 | for (f = 0; f < 8; f++) |
| 459 | walk(c, band, band - 1, 8 * band - 4 + f, |
| 460 | c->band_spectrum[7 - f], c->band_spectrum[f], channel, arg); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | static void walk_band_high(DCAContext *c, int band, int channel, |
| 465 | walk_band_t walk, int32_t *arg) |
| 466 | { |
| 467 | int f; |
| 468 | |
| 469 | if (band == 31) { |
| 470 | for (f = 0; f < 4; f++) |
| 471 | walk(c, 31, 31, 256 - 4 + f, 0, -2047, channel, arg); |
| 472 | } else { |
| 473 | for (f = 0; f < 8; f++) |
| 474 | walk(c, band, band + 1, 8 * band + 4 + f, |
| 475 | c->band_spectrum[f], c->band_spectrum[7 - f], channel, arg); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | static void update_band_masking(DCAContext *c, int band1, int band2, |
| 480 | int f, int32_t spectrum1, int32_t spectrum2, |
| 481 | int channel, int32_t * arg) |
| 482 | { |
| 483 | int32_t value = c->eff_masking_curve_cb[f] - spectrum1; |
| 484 | |
| 485 | if (value < c->band_masking_cb[band1]) |
| 486 | c->band_masking_cb[band1] = value; |
| 487 | } |
| 488 | |
| 489 | static void calc_masking(DCAContext *c, const int32_t *input) |
| 490 | { |
| 491 | int i, k, band, ch, ssf; |
| 492 | int32_t data[512]; |
| 493 | |
| 494 | for (i = 0; i < 256; i++) |
| 495 | for (ssf = 0; ssf < SUBSUBFRAMES; ssf++) |
| 496 | c->masking_curve_cb[ssf][i] = -2047; |
| 497 | |
| 498 | for (ssf = 0; ssf < SUBSUBFRAMES; ssf++) |
| 499 | for (ch = 0; ch < c->fullband_channels; ch++) { |
| 500 | for (i = 0, k = 128 + 256 * ssf; k < 512; i++, k++) |
| 501 | data[i] = c->history[k][ch]; |
| 502 | for (k -= 512; i < 512; i++, k++) |
| 503 | data[i] = input[k * c->channels + ch]; |
| 504 | adjust_jnd(c->samplerate_index, data, c->masking_curve_cb[ssf]); |
| 505 | } |
| 506 | for (i = 0; i < 256; i++) { |
| 507 | int32_t m = 2048; |
| 508 | |
| 509 | for (ssf = 0; ssf < SUBSUBFRAMES; ssf++) |
| 510 | if (c->masking_curve_cb[ssf][i] < m) |
| 511 | m = c->masking_curve_cb[ssf][i]; |
| 512 | c->eff_masking_curve_cb[i] = m; |
| 513 | } |
| 514 | |
| 515 | for (band = 0; band < 32; band++) { |
| 516 | c->band_masking_cb[band] = 2048; |
| 517 | walk_band_low(c, band, 0, update_band_masking, NULL); |
| 518 | walk_band_high(c, band, 0, update_band_masking, NULL); |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | static void find_peaks(DCAContext *c) |
| 523 | { |
| 524 | int band, ch; |
| 525 | |
| 526 | for (band = 0; band < 32; band++) |
| 527 | for (ch = 0; ch < c->fullband_channels; ch++) { |
| 528 | int sample; |
| 529 | int32_t m = 0; |
| 530 | |
| 531 | for (sample = 0; sample < SUBBAND_SAMPLES; sample++) { |
| 532 | int32_t s = abs(c->subband[sample][band][ch]); |
| 533 | if (m < s) |
| 534 | m = s; |
| 535 | } |
| 536 | c->peak_cb[band][ch] = get_cb(m); |
| 537 | } |
| 538 | |
| 539 | if (c->lfe_channel) { |
| 540 | int sample; |
| 541 | int32_t m = 0; |
| 542 | |
| 543 | for (sample = 0; sample < DCA_LFE_SAMPLES; sample++) |
| 544 | if (m < abs(c->downsampled_lfe[sample])) |
| 545 | m = abs(c->downsampled_lfe[sample]); |
| 546 | c->lfe_peak_cb = get_cb(m); |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | static const int snr_fudge = 128; |
| 551 | #define USED_1ABITS 1 |
| 552 | #define USED_NABITS 2 |
| 553 | #define USED_26ABITS 4 |
| 554 | |
| 555 | static int init_quantization_noise(DCAContext *c, int noise) |
| 556 | { |
| 557 | int ch, band, ret = 0; |
| 558 | |
| 559 | c->consumed_bits = 132 + 493 * c->fullband_channels; |
| 560 | if (c->lfe_channel) |
| 561 | c->consumed_bits += 72; |
| 562 | |
| 563 | /* attempt to guess the bit distribution based on the prevoius frame */ |
| 564 | for (ch = 0; ch < c->fullband_channels; ch++) { |
| 565 | for (band = 0; band < 32; band++) { |
| 566 | int snr_cb = c->peak_cb[band][ch] - c->band_masking_cb[band] - noise; |
| 567 | |
| 568 | if (snr_cb >= 1312) { |
| 569 | c->abits[band][ch] = 26; |
| 570 | ret |= USED_26ABITS; |
| 571 | } else if (snr_cb >= 222) { |
| 572 | c->abits[band][ch] = 8 + mul32(snr_cb - 222, 69000000); |
| 573 | ret |= USED_NABITS; |
| 574 | } else if (snr_cb >= 0) { |
| 575 | c->abits[band][ch] = 2 + mul32(snr_cb, 106000000); |
| 576 | ret |= USED_NABITS; |
| 577 | } else { |
| 578 | c->abits[band][ch] = 1; |
| 579 | ret |= USED_1ABITS; |
| 580 | } |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | for (band = 0; band < 32; band++) |
| 585 | for (ch = 0; ch < c->fullband_channels; ch++) { |
| 586 | c->consumed_bits += bit_consumption[c->abits[band][ch]]; |
| 587 | } |
| 588 | |
| 589 | return ret; |
| 590 | } |
| 591 | |
| 592 | static void assign_bits(DCAContext *c) |
| 593 | { |
| 594 | /* Find the bounds where the binary search should work */ |
| 595 | int low, high, down; |
| 596 | int used_abits = 0; |
| 597 | |
| 598 | init_quantization_noise(c, c->worst_quantization_noise); |
| 599 | low = high = c->worst_quantization_noise; |
| 600 | if (c->consumed_bits > c->frame_bits) { |
| 601 | while (c->consumed_bits > c->frame_bits) { |
| 602 | av_assert0(used_abits != USED_1ABITS); |
| 603 | low = high; |
| 604 | high += snr_fudge; |
| 605 | used_abits = init_quantization_noise(c, high); |
| 606 | } |
| 607 | } else { |
| 608 | while (c->consumed_bits <= c->frame_bits) { |
| 609 | high = low; |
| 610 | if (used_abits == USED_26ABITS) |
| 611 | goto out; /* The requested bitrate is too high, pad with zeros */ |
| 612 | low -= snr_fudge; |
| 613 | used_abits = init_quantization_noise(c, low); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | /* Now do a binary search between low and high to see what fits */ |
| 618 | for (down = snr_fudge >> 1; down; down >>= 1) { |
| 619 | init_quantization_noise(c, high - down); |
| 620 | if (c->consumed_bits <= c->frame_bits) |
| 621 | high -= down; |
| 622 | } |
| 623 | init_quantization_noise(c, high); |
| 624 | out: |
| 625 | c->worst_quantization_noise = high; |
| 626 | if (high > c->worst_noise_ever) |
| 627 | c->worst_noise_ever = high; |
| 628 | } |
| 629 | |
| 630 | static void shift_history(DCAContext *c, const int32_t *input) |
| 631 | { |
| 632 | int k, ch; |
| 633 | |
| 634 | for (k = 0; k < 512; k++) |
| 635 | for (ch = 0; ch < c->channels; ch++) |
| 636 | c->history[k][ch] = input[k * c->channels + ch]; |
| 637 | } |
| 638 | |
| 639 | static int32_t quantize_value(int32_t value, softfloat quant) |
| 640 | { |
| 641 | int32_t offset = 1 << (quant.e - 1); |
| 642 | |
| 643 | value = mul32(value, quant.m) + offset; |
| 644 | value = value >> quant.e; |
| 645 | return value; |
| 646 | } |
| 647 | |
| 648 | static int calc_one_scale(int32_t peak_cb, int abits, softfloat *quant) |
| 649 | { |
| 650 | int32_t peak; |
| 651 | int our_nscale, try_remove; |
| 652 | softfloat our_quant; |
| 653 | |
| 654 | av_assert0(peak_cb <= 0); |
| 655 | av_assert0(peak_cb >= -2047); |
| 656 | |
| 657 | our_nscale = 127; |
| 658 | peak = cb_to_level[-peak_cb]; |
| 659 | |
| 660 | for (try_remove = 64; try_remove > 0; try_remove >>= 1) { |
| 661 | if (scalefactor_inv[our_nscale - try_remove].e + stepsize_inv[abits].e <= 17) |
| 662 | continue; |
| 663 | our_quant.m = mul32(scalefactor_inv[our_nscale - try_remove].m, stepsize_inv[abits].m); |
| 664 | our_quant.e = scalefactor_inv[our_nscale - try_remove].e + stepsize_inv[abits].e - 17; |
| 665 | if ((quant_levels[abits] - 1) / 2 < quantize_value(peak, our_quant)) |
| 666 | continue; |
| 667 | our_nscale -= try_remove; |
| 668 | } |
| 669 | |
| 670 | if (our_nscale >= 125) |
| 671 | our_nscale = 124; |
| 672 | |
| 673 | quant->m = mul32(scalefactor_inv[our_nscale].m, stepsize_inv[abits].m); |
| 674 | quant->e = scalefactor_inv[our_nscale].e + stepsize_inv[abits].e - 17; |
| 675 | av_assert0((quant_levels[abits] - 1) / 2 >= quantize_value(peak, *quant)); |
| 676 | |
| 677 | return our_nscale; |
| 678 | } |
| 679 | |
| 680 | static void calc_scales(DCAContext *c) |
| 681 | { |
| 682 | int band, ch; |
| 683 | |
| 684 | for (band = 0; band < 32; band++) |
| 685 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 686 | c->scale_factor[band][ch] = calc_one_scale(c->peak_cb[band][ch], |
| 687 | c->abits[band][ch], |
| 688 | &c->quant[band][ch]); |
| 689 | |
| 690 | if (c->lfe_channel) |
| 691 | c->lfe_scale_factor = calc_one_scale(c->lfe_peak_cb, 11, &c->lfe_quant); |
| 692 | } |
| 693 | |
| 694 | static void quantize_all(DCAContext *c) |
| 695 | { |
| 696 | int sample, band, ch; |
| 697 | |
| 698 | for (sample = 0; sample < SUBBAND_SAMPLES; sample++) |
| 699 | for (band = 0; band < 32; band++) |
| 700 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 701 | c->quantized[sample][band][ch] = quantize_value(c->subband[sample][band][ch], c->quant[band][ch]); |
| 702 | } |
| 703 | |
| 704 | static void put_frame_header(DCAContext *c) |
| 705 | { |
| 706 | /* SYNC */ |
| 707 | put_bits(&c->pb, 16, 0x7ffe); |
| 708 | put_bits(&c->pb, 16, 0x8001); |
| 709 | |
| 710 | /* Frame type: normal */ |
| 711 | put_bits(&c->pb, 1, 1); |
| 712 | |
| 713 | /* Deficit sample count: none */ |
| 714 | put_bits(&c->pb, 5, 31); |
| 715 | |
| 716 | /* CRC is not present */ |
| 717 | put_bits(&c->pb, 1, 0); |
| 718 | |
| 719 | /* Number of PCM sample blocks */ |
| 720 | put_bits(&c->pb, 7, SUBBAND_SAMPLES - 1); |
| 721 | |
| 722 | /* Primary frame byte size */ |
| 723 | put_bits(&c->pb, 14, c->frame_size - 1); |
| 724 | |
| 725 | /* Audio channel arrangement */ |
| 726 | put_bits(&c->pb, 6, c->channel_config); |
| 727 | |
| 728 | /* Core audio sampling frequency */ |
| 729 | put_bits(&c->pb, 4, bitstream_sfreq[c->samplerate_index]); |
| 730 | |
| 731 | /* Transmission bit rate */ |
| 732 | put_bits(&c->pb, 5, c->bitrate_index); |
| 733 | |
| 734 | /* Embedded down mix: disabled */ |
| 735 | put_bits(&c->pb, 1, 0); |
| 736 | |
| 737 | /* Embedded dynamic range flag: not present */ |
| 738 | put_bits(&c->pb, 1, 0); |
| 739 | |
| 740 | /* Embedded time stamp flag: not present */ |
| 741 | put_bits(&c->pb, 1, 0); |
| 742 | |
| 743 | /* Auxiliary data flag: not present */ |
| 744 | put_bits(&c->pb, 1, 0); |
| 745 | |
| 746 | /* HDCD source: no */ |
| 747 | put_bits(&c->pb, 1, 0); |
| 748 | |
| 749 | /* Extension audio ID: N/A */ |
| 750 | put_bits(&c->pb, 3, 0); |
| 751 | |
| 752 | /* Extended audio data: not present */ |
| 753 | put_bits(&c->pb, 1, 0); |
| 754 | |
| 755 | /* Audio sync word insertion flag: after each sub-frame */ |
| 756 | put_bits(&c->pb, 1, 0); |
| 757 | |
| 758 | /* Low frequency effects flag: not present or 64x subsampling */ |
| 759 | put_bits(&c->pb, 2, c->lfe_channel ? 2 : 0); |
| 760 | |
| 761 | /* Predictor history switch flag: on */ |
| 762 | put_bits(&c->pb, 1, 1); |
| 763 | |
| 764 | /* No CRC */ |
| 765 | /* Multirate interpolator switch: non-perfect reconstruction */ |
| 766 | put_bits(&c->pb, 1, 0); |
| 767 | |
| 768 | /* Encoder software revision: 7 */ |
| 769 | put_bits(&c->pb, 4, 7); |
| 770 | |
| 771 | /* Copy history: 0 */ |
| 772 | put_bits(&c->pb, 2, 0); |
| 773 | |
| 774 | /* Source PCM resolution: 16 bits, not DTS ES */ |
| 775 | put_bits(&c->pb, 3, 0); |
| 776 | |
| 777 | /* Front sum/difference coding: no */ |
| 778 | put_bits(&c->pb, 1, 0); |
| 779 | |
| 780 | /* Surrounds sum/difference coding: no */ |
| 781 | put_bits(&c->pb, 1, 0); |
| 782 | |
| 783 | /* Dialog normalization: 0 dB */ |
| 784 | put_bits(&c->pb, 4, 0); |
| 785 | } |
| 786 | |
| 787 | static void put_primary_audio_header(DCAContext *c) |
| 788 | { |
| 789 | static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 }; |
| 790 | static const int thr[11] = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 }; |
| 791 | |
| 792 | int ch, i; |
| 793 | /* Number of subframes */ |
| 794 | put_bits(&c->pb, 4, SUBFRAMES - 1); |
| 795 | |
| 796 | /* Number of primary audio channels */ |
| 797 | put_bits(&c->pb, 3, c->fullband_channels - 1); |
| 798 | |
| 799 | /* Subband activity count */ |
| 800 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 801 | put_bits(&c->pb, 5, DCA_SUBBANDS - 2); |
| 802 | |
| 803 | /* High frequency VQ start subband */ |
| 804 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 805 | put_bits(&c->pb, 5, DCA_SUBBANDS - 1); |
| 806 | |
| 807 | /* Joint intensity coding index: 0, 0 */ |
| 808 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 809 | put_bits(&c->pb, 3, 0); |
| 810 | |
| 811 | /* Transient mode codebook: A4, A4 (arbitrary) */ |
| 812 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 813 | put_bits(&c->pb, 2, 0); |
| 814 | |
| 815 | /* Scale factor code book: 7 bit linear, 7-bit sqrt table (for each channel) */ |
| 816 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 817 | put_bits(&c->pb, 3, 6); |
| 818 | |
| 819 | /* Bit allocation quantizer select: linear 5-bit */ |
| 820 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 821 | put_bits(&c->pb, 3, 6); |
| 822 | |
| 823 | /* Quantization index codebook select: dummy data |
| 824 | to avoid transmission of scale factor adjustment */ |
| 825 | for (i = 1; i < 11; i++) |
| 826 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 827 | put_bits(&c->pb, bitlen[i], thr[i]); |
| 828 | |
| 829 | /* Scale factor adjustment index: not transmitted */ |
| 830 | /* Audio header CRC check word: not transmitted */ |
| 831 | } |
| 832 | |
| 833 | static void put_subframe_samples(DCAContext *c, int ss, int band, int ch) |
| 834 | { |
| 835 | if (c->abits[band][ch] <= 7) { |
| 836 | int sum, i, j; |
| 837 | for (i = 0; i < 8; i += 4) { |
| 838 | sum = 0; |
| 839 | for (j = 3; j >= 0; j--) { |
| 840 | sum *= quant_levels[c->abits[band][ch]]; |
| 841 | sum += c->quantized[ss * 8 + i + j][band][ch]; |
| 842 | sum += (quant_levels[c->abits[band][ch]] - 1) / 2; |
| 843 | } |
| 844 | put_bits(&c->pb, bit_consumption[c->abits[band][ch]] / 4, sum); |
| 845 | } |
| 846 | } else { |
| 847 | int i; |
| 848 | for (i = 0; i < 8; i++) { |
| 849 | int bits = bit_consumption[c->abits[band][ch]] / 16; |
| 850 | int32_t mask = (1 << bits) - 1; |
| 851 | put_bits(&c->pb, bits, c->quantized[ss * 8 + i][band][ch] & mask); |
| 852 | } |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | static void put_subframe(DCAContext *c, int subframe) |
| 857 | { |
| 858 | int i, band, ss, ch; |
| 859 | |
| 860 | /* Subsubframes count */ |
| 861 | put_bits(&c->pb, 2, SUBSUBFRAMES -1); |
| 862 | |
| 863 | /* Partial subsubframe sample count: dummy */ |
| 864 | put_bits(&c->pb, 3, 0); |
| 865 | |
| 866 | /* Prediction mode: no ADPCM, in each channel and subband */ |
| 867 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 868 | for (band = 0; band < DCA_SUBBANDS; band++) |
| 869 | put_bits(&c->pb, 1, 0); |
| 870 | |
| 871 | /* Prediction VQ address: not transmitted */ |
| 872 | /* Bit allocation index */ |
| 873 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 874 | for (band = 0; band < DCA_SUBBANDS; band++) |
| 875 | put_bits(&c->pb, 5, c->abits[band][ch]); |
| 876 | |
| 877 | if (SUBSUBFRAMES > 1) { |
| 878 | /* Transition mode: none for each channel and subband */ |
| 879 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 880 | for (band = 0; band < DCA_SUBBANDS; band++) |
| 881 | put_bits(&c->pb, 1, 0); /* codebook A4 */ |
| 882 | } |
| 883 | |
| 884 | /* Scale factors */ |
| 885 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 886 | for (band = 0; band < DCA_SUBBANDS; band++) |
| 887 | put_bits(&c->pb, 7, c->scale_factor[band][ch]); |
| 888 | |
| 889 | /* Joint subband scale factor codebook select: not transmitted */ |
| 890 | /* Scale factors for joint subband coding: not transmitted */ |
| 891 | /* Stereo down-mix coefficients: not transmitted */ |
| 892 | /* Dynamic range coefficient: not transmitted */ |
| 893 | /* Stde information CRC check word: not transmitted */ |
| 894 | /* VQ encoded high frequency subbands: not transmitted */ |
| 895 | |
| 896 | /* LFE data: 8 samples and scalefactor */ |
| 897 | if (c->lfe_channel) { |
| 898 | for (i = 0; i < DCA_LFE_SAMPLES; i++) |
| 899 | put_bits(&c->pb, 8, quantize_value(c->downsampled_lfe[i], c->lfe_quant) & 0xff); |
| 900 | put_bits(&c->pb, 8, c->lfe_scale_factor); |
| 901 | } |
| 902 | |
| 903 | /* Audio data (subsubframes) */ |
| 904 | for (ss = 0; ss < SUBSUBFRAMES ; ss++) |
| 905 | for (ch = 0; ch < c->fullband_channels; ch++) |
| 906 | for (band = 0; band < DCA_SUBBANDS; band++) |
| 907 | put_subframe_samples(c, ss, band, ch); |
| 908 | |
| 909 | /* DSYNC */ |
| 910 | put_bits(&c->pb, 16, 0xffff); |
| 911 | } |
| 912 | |
| 913 | static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
| 914 | const AVFrame *frame, int *got_packet_ptr) |
| 915 | { |
| 916 | DCAContext *c = avctx->priv_data; |
| 917 | const int32_t *samples; |
| 918 | int ret, i; |
| 919 | |
| 920 | if ((ret = ff_alloc_packet2(avctx, avpkt, c->frame_size )) < 0) |
| 921 | return ret; |
| 922 | |
| 923 | samples = (const int32_t *)frame->data[0]; |
| 924 | |
| 925 | subband_transform(c, samples); |
| 926 | if (c->lfe_channel) |
| 927 | lfe_downsample(c, samples); |
| 928 | |
| 929 | calc_masking(c, samples); |
| 930 | find_peaks(c); |
| 931 | assign_bits(c); |
| 932 | calc_scales(c); |
| 933 | quantize_all(c); |
| 934 | shift_history(c, samples); |
| 935 | |
| 936 | init_put_bits(&c->pb, avpkt->data, avpkt->size); |
| 937 | put_frame_header(c); |
| 938 | put_primary_audio_header(c); |
| 939 | for (i = 0; i < SUBFRAMES; i++) |
| 940 | put_subframe(c, i); |
| 941 | |
| 942 | flush_put_bits(&c->pb); |
| 943 | |
| 944 | avpkt->pts = frame->pts; |
| 945 | avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples); |
| 946 | avpkt->size = c->frame_size + 1; |
| 947 | *got_packet_ptr = 1; |
| 948 | return 0; |
| 949 | } |
| 950 | |
| 951 | static const AVCodecDefault defaults[] = { |
| 952 | { "b", "1411200" }, |
| 953 | { NULL }, |
| 954 | }; |
| 955 | |
| 956 | AVCodec ff_dca_encoder = { |
| 957 | .name = "dca", |
| 958 | .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"), |
| 959 | .type = AVMEDIA_TYPE_AUDIO, |
| 960 | .id = AV_CODEC_ID_DTS, |
| 961 | .priv_data_size = sizeof(DCAContext), |
| 962 | .init = encode_init, |
| 963 | .encode2 = encode_frame, |
| 964 | .capabilities = CODEC_CAP_EXPERIMENTAL, |
| 965 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32, |
| 966 | AV_SAMPLE_FMT_NONE }, |
| 967 | .supported_samplerates = sample_rates, |
| 968 | .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
| 969 | AV_CH_LAYOUT_STEREO, |
| 970 | AV_CH_LAYOUT_2_2, |
| 971 | AV_CH_LAYOUT_5POINT0, |
| 972 | AV_CH_LAYOUT_5POINT1, |
| 973 | 0 }, |
| 974 | .defaults = defaults, |
| 975 | }; |