| 1 | /* |
| 2 | * G.723.1 compatible decoder |
| 3 | * Copyright (c) 2006 Benjamin Larsson |
| 4 | * Copyright (c) 2010 Mohamed Naufal Basheer |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * G.723.1 compatible decoder |
| 26 | */ |
| 27 | |
| 28 | #define BITSTREAM_READER_LE |
| 29 | #include "libavutil/channel_layout.h" |
| 30 | #include "libavutil/mem.h" |
| 31 | #include "libavutil/opt.h" |
| 32 | #include "avcodec.h" |
| 33 | #include "get_bits.h" |
| 34 | #include "acelp_vectors.h" |
| 35 | #include "celp_filters.h" |
| 36 | #include "celp_math.h" |
| 37 | #include "g723_1_data.h" |
| 38 | #include "internal.h" |
| 39 | |
| 40 | #define CNG_RANDOM_SEED 12345 |
| 41 | |
| 42 | typedef struct g723_1_context { |
| 43 | AVClass *class; |
| 44 | |
| 45 | G723_1_Subframe subframe[4]; |
| 46 | enum FrameType cur_frame_type; |
| 47 | enum FrameType past_frame_type; |
| 48 | enum Rate cur_rate; |
| 49 | uint8_t lsp_index[LSP_BANDS]; |
| 50 | int pitch_lag[2]; |
| 51 | int erased_frames; |
| 52 | |
| 53 | int16_t prev_lsp[LPC_ORDER]; |
| 54 | int16_t sid_lsp[LPC_ORDER]; |
| 55 | int16_t prev_excitation[PITCH_MAX]; |
| 56 | int16_t excitation[PITCH_MAX + FRAME_LEN + 4]; |
| 57 | int16_t synth_mem[LPC_ORDER]; |
| 58 | int16_t fir_mem[LPC_ORDER]; |
| 59 | int iir_mem[LPC_ORDER]; |
| 60 | |
| 61 | int random_seed; |
| 62 | int cng_random_seed; |
| 63 | int interp_index; |
| 64 | int interp_gain; |
| 65 | int sid_gain; |
| 66 | int cur_gain; |
| 67 | int reflection_coef; |
| 68 | int pf_gain; ///< formant postfilter |
| 69 | ///< gain scaling unit memory |
| 70 | int postfilter; |
| 71 | |
| 72 | int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX + 4]; |
| 73 | int16_t prev_data[HALF_FRAME_LEN]; |
| 74 | int16_t prev_weight_sig[PITCH_MAX]; |
| 75 | |
| 76 | |
| 77 | int16_t hpf_fir_mem; ///< highpass filter fir |
| 78 | int hpf_iir_mem; ///< and iir memories |
| 79 | int16_t perf_fir_mem[LPC_ORDER]; ///< perceptual filter fir |
| 80 | int16_t perf_iir_mem[LPC_ORDER]; ///< and iir memories |
| 81 | |
| 82 | int16_t harmonic_mem[PITCH_MAX]; |
| 83 | } G723_1_Context; |
| 84 | |
| 85 | static av_cold int g723_1_decode_init(AVCodecContext *avctx) |
| 86 | { |
| 87 | G723_1_Context *p = avctx->priv_data; |
| 88 | |
| 89 | avctx->channel_layout = AV_CH_LAYOUT_MONO; |
| 90 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| 91 | avctx->channels = 1; |
| 92 | p->pf_gain = 1 << 12; |
| 93 | |
| 94 | memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); |
| 95 | memcpy(p->sid_lsp, dc_lsp, LPC_ORDER * sizeof(*p->sid_lsp)); |
| 96 | |
| 97 | p->cng_random_seed = CNG_RANDOM_SEED; |
| 98 | p->past_frame_type = SID_FRAME; |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Unpack the frame into parameters. |
| 105 | * |
| 106 | * @param p the context |
| 107 | * @param buf pointer to the input buffer |
| 108 | * @param buf_size size of the input buffer |
| 109 | */ |
| 110 | static int unpack_bitstream(G723_1_Context *p, const uint8_t *buf, |
| 111 | int buf_size) |
| 112 | { |
| 113 | GetBitContext gb; |
| 114 | int ad_cb_len; |
| 115 | int temp, info_bits, i; |
| 116 | |
| 117 | init_get_bits(&gb, buf, buf_size * 8); |
| 118 | |
| 119 | /* Extract frame type and rate info */ |
| 120 | info_bits = get_bits(&gb, 2); |
| 121 | |
| 122 | if (info_bits == 3) { |
| 123 | p->cur_frame_type = UNTRANSMITTED_FRAME; |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | /* Extract 24 bit lsp indices, 8 bit for each band */ |
| 128 | p->lsp_index[2] = get_bits(&gb, 8); |
| 129 | p->lsp_index[1] = get_bits(&gb, 8); |
| 130 | p->lsp_index[0] = get_bits(&gb, 8); |
| 131 | |
| 132 | if (info_bits == 2) { |
| 133 | p->cur_frame_type = SID_FRAME; |
| 134 | p->subframe[0].amp_index = get_bits(&gb, 6); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* Extract the info common to both rates */ |
| 139 | p->cur_rate = info_bits ? RATE_5300 : RATE_6300; |
| 140 | p->cur_frame_type = ACTIVE_FRAME; |
| 141 | |
| 142 | p->pitch_lag[0] = get_bits(&gb, 7); |
| 143 | if (p->pitch_lag[0] > 123) /* test if forbidden code */ |
| 144 | return -1; |
| 145 | p->pitch_lag[0] += PITCH_MIN; |
| 146 | p->subframe[1].ad_cb_lag = get_bits(&gb, 2); |
| 147 | |
| 148 | p->pitch_lag[1] = get_bits(&gb, 7); |
| 149 | if (p->pitch_lag[1] > 123) |
| 150 | return -1; |
| 151 | p->pitch_lag[1] += PITCH_MIN; |
| 152 | p->subframe[3].ad_cb_lag = get_bits(&gb, 2); |
| 153 | p->subframe[0].ad_cb_lag = 1; |
| 154 | p->subframe[2].ad_cb_lag = 1; |
| 155 | |
| 156 | for (i = 0; i < SUBFRAMES; i++) { |
| 157 | /* Extract combined gain */ |
| 158 | temp = get_bits(&gb, 12); |
| 159 | ad_cb_len = 170; |
| 160 | p->subframe[i].dirac_train = 0; |
| 161 | if (p->cur_rate == RATE_6300 && p->pitch_lag[i >> 1] < SUBFRAME_LEN - 2) { |
| 162 | p->subframe[i].dirac_train = temp >> 11; |
| 163 | temp &= 0x7FF; |
| 164 | ad_cb_len = 85; |
| 165 | } |
| 166 | p->subframe[i].ad_cb_gain = FASTDIV(temp, GAIN_LEVELS); |
| 167 | if (p->subframe[i].ad_cb_gain < ad_cb_len) { |
| 168 | p->subframe[i].amp_index = temp - p->subframe[i].ad_cb_gain * |
| 169 | GAIN_LEVELS; |
| 170 | } else { |
| 171 | return -1; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | p->subframe[0].grid_index = get_bits1(&gb); |
| 176 | p->subframe[1].grid_index = get_bits1(&gb); |
| 177 | p->subframe[2].grid_index = get_bits1(&gb); |
| 178 | p->subframe[3].grid_index = get_bits1(&gb); |
| 179 | |
| 180 | if (p->cur_rate == RATE_6300) { |
| 181 | skip_bits1(&gb); /* skip reserved bit */ |
| 182 | |
| 183 | /* Compute pulse_pos index using the 13-bit combined position index */ |
| 184 | temp = get_bits(&gb, 13); |
| 185 | p->subframe[0].pulse_pos = temp / 810; |
| 186 | |
| 187 | temp -= p->subframe[0].pulse_pos * 810; |
| 188 | p->subframe[1].pulse_pos = FASTDIV(temp, 90); |
| 189 | |
| 190 | temp -= p->subframe[1].pulse_pos * 90; |
| 191 | p->subframe[2].pulse_pos = FASTDIV(temp, 9); |
| 192 | p->subframe[3].pulse_pos = temp - p->subframe[2].pulse_pos * 9; |
| 193 | |
| 194 | p->subframe[0].pulse_pos = (p->subframe[0].pulse_pos << 16) + |
| 195 | get_bits(&gb, 16); |
| 196 | p->subframe[1].pulse_pos = (p->subframe[1].pulse_pos << 14) + |
| 197 | get_bits(&gb, 14); |
| 198 | p->subframe[2].pulse_pos = (p->subframe[2].pulse_pos << 16) + |
| 199 | get_bits(&gb, 16); |
| 200 | p->subframe[3].pulse_pos = (p->subframe[3].pulse_pos << 14) + |
| 201 | get_bits(&gb, 14); |
| 202 | |
| 203 | p->subframe[0].pulse_sign = get_bits(&gb, 6); |
| 204 | p->subframe[1].pulse_sign = get_bits(&gb, 5); |
| 205 | p->subframe[2].pulse_sign = get_bits(&gb, 6); |
| 206 | p->subframe[3].pulse_sign = get_bits(&gb, 5); |
| 207 | } else { /* 5300 bps */ |
| 208 | p->subframe[0].pulse_pos = get_bits(&gb, 12); |
| 209 | p->subframe[1].pulse_pos = get_bits(&gb, 12); |
| 210 | p->subframe[2].pulse_pos = get_bits(&gb, 12); |
| 211 | p->subframe[3].pulse_pos = get_bits(&gb, 12); |
| 212 | |
| 213 | p->subframe[0].pulse_sign = get_bits(&gb, 4); |
| 214 | p->subframe[1].pulse_sign = get_bits(&gb, 4); |
| 215 | p->subframe[2].pulse_sign = get_bits(&gb, 4); |
| 216 | p->subframe[3].pulse_sign = get_bits(&gb, 4); |
| 217 | } |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Bitexact implementation of sqrt(val/2). |
| 224 | */ |
| 225 | static int16_t square_root(unsigned val) |
| 226 | { |
| 227 | av_assert2(!(val & 0x80000000)); |
| 228 | |
| 229 | return (ff_sqrt(val << 1) >> 1) & (~1); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Calculate the number of left-shifts required for normalizing the input. |
| 234 | * |
| 235 | * @param num input number |
| 236 | * @param width width of the input, 15 or 31 bits |
| 237 | */ |
| 238 | static int normalize_bits(int num, int width) |
| 239 | { |
| 240 | return width - av_log2(num) - 1; |
| 241 | } |
| 242 | |
| 243 | #define normalize_bits_int16(num) normalize_bits(num, 15) |
| 244 | #define normalize_bits_int32(num) normalize_bits(num, 31) |
| 245 | |
| 246 | /** |
| 247 | * Scale vector contents based on the largest of their absolutes. |
| 248 | */ |
| 249 | static int scale_vector(int16_t *dst, const int16_t *vector, int length) |
| 250 | { |
| 251 | int bits, max = 0; |
| 252 | int i; |
| 253 | |
| 254 | for (i = 0; i < length; i++) |
| 255 | max |= FFABS(vector[i]); |
| 256 | |
| 257 | bits= 14 - av_log2_16bit(max); |
| 258 | bits= FFMAX(bits, 0); |
| 259 | |
| 260 | for (i = 0; i < length; i++) |
| 261 | dst[i] = vector[i] << bits >> 3; |
| 262 | |
| 263 | return bits - 3; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Perform inverse quantization of LSP frequencies. |
| 268 | * |
| 269 | * @param cur_lsp the current LSP vector |
| 270 | * @param prev_lsp the previous LSP vector |
| 271 | * @param lsp_index VQ indices |
| 272 | * @param bad_frame bad frame flag |
| 273 | */ |
| 274 | static void inverse_quant(int16_t *cur_lsp, int16_t *prev_lsp, |
| 275 | uint8_t *lsp_index, int bad_frame) |
| 276 | { |
| 277 | int min_dist, pred; |
| 278 | int i, j, temp, stable; |
| 279 | |
| 280 | /* Check for frame erasure */ |
| 281 | if (!bad_frame) { |
| 282 | min_dist = 0x100; |
| 283 | pred = 12288; |
| 284 | } else { |
| 285 | min_dist = 0x200; |
| 286 | pred = 23552; |
| 287 | lsp_index[0] = lsp_index[1] = lsp_index[2] = 0; |
| 288 | } |
| 289 | |
| 290 | /* Get the VQ table entry corresponding to the transmitted index */ |
| 291 | cur_lsp[0] = lsp_band0[lsp_index[0]][0]; |
| 292 | cur_lsp[1] = lsp_band0[lsp_index[0]][1]; |
| 293 | cur_lsp[2] = lsp_band0[lsp_index[0]][2]; |
| 294 | cur_lsp[3] = lsp_band1[lsp_index[1]][0]; |
| 295 | cur_lsp[4] = lsp_band1[lsp_index[1]][1]; |
| 296 | cur_lsp[5] = lsp_band1[lsp_index[1]][2]; |
| 297 | cur_lsp[6] = lsp_band2[lsp_index[2]][0]; |
| 298 | cur_lsp[7] = lsp_band2[lsp_index[2]][1]; |
| 299 | cur_lsp[8] = lsp_band2[lsp_index[2]][2]; |
| 300 | cur_lsp[9] = lsp_band2[lsp_index[2]][3]; |
| 301 | |
| 302 | /* Add predicted vector & DC component to the previously quantized vector */ |
| 303 | for (i = 0; i < LPC_ORDER; i++) { |
| 304 | temp = ((prev_lsp[i] - dc_lsp[i]) * pred + (1 << 14)) >> 15; |
| 305 | cur_lsp[i] += dc_lsp[i] + temp; |
| 306 | } |
| 307 | |
| 308 | for (i = 0; i < LPC_ORDER; i++) { |
| 309 | cur_lsp[0] = FFMAX(cur_lsp[0], 0x180); |
| 310 | cur_lsp[LPC_ORDER - 1] = FFMIN(cur_lsp[LPC_ORDER - 1], 0x7e00); |
| 311 | |
| 312 | /* Stability check */ |
| 313 | for (j = 1; j < LPC_ORDER; j++) { |
| 314 | temp = min_dist + cur_lsp[j - 1] - cur_lsp[j]; |
| 315 | if (temp > 0) { |
| 316 | temp >>= 1; |
| 317 | cur_lsp[j - 1] -= temp; |
| 318 | cur_lsp[j] += temp; |
| 319 | } |
| 320 | } |
| 321 | stable = 1; |
| 322 | for (j = 1; j < LPC_ORDER; j++) { |
| 323 | temp = cur_lsp[j - 1] + min_dist - cur_lsp[j] - 4; |
| 324 | if (temp > 0) { |
| 325 | stable = 0; |
| 326 | break; |
| 327 | } |
| 328 | } |
| 329 | if (stable) |
| 330 | break; |
| 331 | } |
| 332 | if (!stable) |
| 333 | memcpy(cur_lsp, prev_lsp, LPC_ORDER * sizeof(*cur_lsp)); |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Bitexact implementation of 2ab scaled by 1/2^16. |
| 338 | * |
| 339 | * @param a 32 bit multiplicand |
| 340 | * @param b 16 bit multiplier |
| 341 | */ |
| 342 | #define MULL2(a, b) \ |
| 343 | MULL(a,b,15) |
| 344 | |
| 345 | /** |
| 346 | * Convert LSP frequencies to LPC coefficients. |
| 347 | * |
| 348 | * @param lpc buffer for LPC coefficients |
| 349 | */ |
| 350 | static void lsp2lpc(int16_t *lpc) |
| 351 | { |
| 352 | int f1[LPC_ORDER / 2 + 1]; |
| 353 | int f2[LPC_ORDER / 2 + 1]; |
| 354 | int i, j; |
| 355 | |
| 356 | /* Calculate negative cosine */ |
| 357 | for (j = 0; j < LPC_ORDER; j++) { |
| 358 | int index = (lpc[j] >> 7) & 0x1FF; |
| 359 | int offset = lpc[j] & 0x7f; |
| 360 | int temp1 = cos_tab[index] << 16; |
| 361 | int temp2 = (cos_tab[index + 1] - cos_tab[index]) * |
| 362 | ((offset << 8) + 0x80) << 1; |
| 363 | |
| 364 | lpc[j] = -(av_sat_dadd32(1 << 15, temp1 + temp2) >> 16); |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Compute sum and difference polynomial coefficients |
| 369 | * (bitexact alternative to lsp2poly() in lsp.c) |
| 370 | */ |
| 371 | /* Initialize with values in Q28 */ |
| 372 | f1[0] = 1 << 28; |
| 373 | f1[1] = (lpc[0] << 14) + (lpc[2] << 14); |
| 374 | f1[2] = lpc[0] * lpc[2] + (2 << 28); |
| 375 | |
| 376 | f2[0] = 1 << 28; |
| 377 | f2[1] = (lpc[1] << 14) + (lpc[3] << 14); |
| 378 | f2[2] = lpc[1] * lpc[3] + (2 << 28); |
| 379 | |
| 380 | /* |
| 381 | * Calculate and scale the coefficients by 1/2 in |
| 382 | * each iteration for a final scaling factor of Q25 |
| 383 | */ |
| 384 | for (i = 2; i < LPC_ORDER / 2; i++) { |
| 385 | f1[i + 1] = f1[i - 1] + MULL2(f1[i], lpc[2 * i]); |
| 386 | f2[i + 1] = f2[i - 1] + MULL2(f2[i], lpc[2 * i + 1]); |
| 387 | |
| 388 | for (j = i; j >= 2; j--) { |
| 389 | f1[j] = MULL2(f1[j - 1], lpc[2 * i]) + |
| 390 | (f1[j] >> 1) + (f1[j - 2] >> 1); |
| 391 | f2[j] = MULL2(f2[j - 1], lpc[2 * i + 1]) + |
| 392 | (f2[j] >> 1) + (f2[j - 2] >> 1); |
| 393 | } |
| 394 | |
| 395 | f1[0] >>= 1; |
| 396 | f2[0] >>= 1; |
| 397 | f1[1] = ((lpc[2 * i] << 16 >> i) + f1[1]) >> 1; |
| 398 | f2[1] = ((lpc[2 * i + 1] << 16 >> i) + f2[1]) >> 1; |
| 399 | } |
| 400 | |
| 401 | /* Convert polynomial coefficients to LPC coefficients */ |
| 402 | for (i = 0; i < LPC_ORDER / 2; i++) { |
| 403 | int64_t ff1 = f1[i + 1] + f1[i]; |
| 404 | int64_t ff2 = f2[i + 1] - f2[i]; |
| 405 | |
| 406 | lpc[i] = av_clipl_int32(((ff1 + ff2) << 3) + (1 << 15)) >> 16; |
| 407 | lpc[LPC_ORDER - i - 1] = av_clipl_int32(((ff1 - ff2) << 3) + |
| 408 | (1 << 15)) >> 16; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Quantize LSP frequencies by interpolation and convert them to |
| 414 | * the corresponding LPC coefficients. |
| 415 | * |
| 416 | * @param lpc buffer for LPC coefficients |
| 417 | * @param cur_lsp the current LSP vector |
| 418 | * @param prev_lsp the previous LSP vector |
| 419 | */ |
| 420 | static void lsp_interpolate(int16_t *lpc, int16_t *cur_lsp, int16_t *prev_lsp) |
| 421 | { |
| 422 | int i; |
| 423 | int16_t *lpc_ptr = lpc; |
| 424 | |
| 425 | /* cur_lsp * 0.25 + prev_lsp * 0.75 */ |
| 426 | ff_acelp_weighted_vector_sum(lpc, cur_lsp, prev_lsp, |
| 427 | 4096, 12288, 1 << 13, 14, LPC_ORDER); |
| 428 | ff_acelp_weighted_vector_sum(lpc + LPC_ORDER, cur_lsp, prev_lsp, |
| 429 | 8192, 8192, 1 << 13, 14, LPC_ORDER); |
| 430 | ff_acelp_weighted_vector_sum(lpc + 2 * LPC_ORDER, cur_lsp, prev_lsp, |
| 431 | 12288, 4096, 1 << 13, 14, LPC_ORDER); |
| 432 | memcpy(lpc + 3 * LPC_ORDER, cur_lsp, LPC_ORDER * sizeof(*lpc)); |
| 433 | |
| 434 | for (i = 0; i < SUBFRAMES; i++) { |
| 435 | lsp2lpc(lpc_ptr); |
| 436 | lpc_ptr += LPC_ORDER; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Generate a train of dirac functions with period as pitch lag. |
| 442 | */ |
| 443 | static void gen_dirac_train(int16_t *buf, int pitch_lag) |
| 444 | { |
| 445 | int16_t vector[SUBFRAME_LEN]; |
| 446 | int i, j; |
| 447 | |
| 448 | memcpy(vector, buf, SUBFRAME_LEN * sizeof(*vector)); |
| 449 | for (i = pitch_lag; i < SUBFRAME_LEN; i += pitch_lag) { |
| 450 | for (j = 0; j < SUBFRAME_LEN - i; j++) |
| 451 | buf[i + j] += vector[j]; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * Generate fixed codebook excitation vector. |
| 457 | * |
| 458 | * @param vector decoded excitation vector |
| 459 | * @param subfrm current subframe |
| 460 | * @param cur_rate current bitrate |
| 461 | * @param pitch_lag closed loop pitch lag |
| 462 | * @param index current subframe index |
| 463 | */ |
| 464 | static void gen_fcb_excitation(int16_t *vector, G723_1_Subframe *subfrm, |
| 465 | enum Rate cur_rate, int pitch_lag, int index) |
| 466 | { |
| 467 | int temp, i, j; |
| 468 | |
| 469 | memset(vector, 0, SUBFRAME_LEN * sizeof(*vector)); |
| 470 | |
| 471 | if (cur_rate == RATE_6300) { |
| 472 | if (subfrm->pulse_pos >= max_pos[index]) |
| 473 | return; |
| 474 | |
| 475 | /* Decode amplitudes and positions */ |
| 476 | j = PULSE_MAX - pulses[index]; |
| 477 | temp = subfrm->pulse_pos; |
| 478 | for (i = 0; i < SUBFRAME_LEN / GRID_SIZE; i++) { |
| 479 | temp -= combinatorial_table[j][i]; |
| 480 | if (temp >= 0) |
| 481 | continue; |
| 482 | temp += combinatorial_table[j++][i]; |
| 483 | if (subfrm->pulse_sign & (1 << (PULSE_MAX - j))) { |
| 484 | vector[subfrm->grid_index + GRID_SIZE * i] = |
| 485 | -fixed_cb_gain[subfrm->amp_index]; |
| 486 | } else { |
| 487 | vector[subfrm->grid_index + GRID_SIZE * i] = |
| 488 | fixed_cb_gain[subfrm->amp_index]; |
| 489 | } |
| 490 | if (j == PULSE_MAX) |
| 491 | break; |
| 492 | } |
| 493 | if (subfrm->dirac_train == 1) |
| 494 | gen_dirac_train(vector, pitch_lag); |
| 495 | } else { /* 5300 bps */ |
| 496 | int cb_gain = fixed_cb_gain[subfrm->amp_index]; |
| 497 | int cb_shift = subfrm->grid_index; |
| 498 | int cb_sign = subfrm->pulse_sign; |
| 499 | int cb_pos = subfrm->pulse_pos; |
| 500 | int offset, beta, lag; |
| 501 | |
| 502 | for (i = 0; i < 8; i += 2) { |
| 503 | offset = ((cb_pos & 7) << 3) + cb_shift + i; |
| 504 | vector[offset] = (cb_sign & 1) ? cb_gain : -cb_gain; |
| 505 | cb_pos >>= 3; |
| 506 | cb_sign >>= 1; |
| 507 | } |
| 508 | |
| 509 | /* Enhance harmonic components */ |
| 510 | lag = pitch_contrib[subfrm->ad_cb_gain << 1] + pitch_lag + |
| 511 | subfrm->ad_cb_lag - 1; |
| 512 | beta = pitch_contrib[(subfrm->ad_cb_gain << 1) + 1]; |
| 513 | |
| 514 | if (lag < SUBFRAME_LEN - 2) { |
| 515 | for (i = lag; i < SUBFRAME_LEN; i++) |
| 516 | vector[i] += beta * vector[i - lag] >> 15; |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * Get delayed contribution from the previous excitation vector. |
| 523 | */ |
| 524 | static void get_residual(int16_t *residual, int16_t *prev_excitation, int lag) |
| 525 | { |
| 526 | int offset = PITCH_MAX - PITCH_ORDER / 2 - lag; |
| 527 | int i; |
| 528 | |
| 529 | residual[0] = prev_excitation[offset]; |
| 530 | residual[1] = prev_excitation[offset + 1]; |
| 531 | |
| 532 | offset += 2; |
| 533 | for (i = 2; i < SUBFRAME_LEN + PITCH_ORDER - 1; i++) |
| 534 | residual[i] = prev_excitation[offset + (i - 2) % lag]; |
| 535 | } |
| 536 | |
| 537 | static int dot_product(const int16_t *a, const int16_t *b, int length) |
| 538 | { |
| 539 | int sum = ff_dot_product(a,b,length); |
| 540 | return av_sat_add32(sum, sum); |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * Generate adaptive codebook excitation. |
| 545 | */ |
| 546 | static void gen_acb_excitation(int16_t *vector, int16_t *prev_excitation, |
| 547 | int pitch_lag, G723_1_Subframe *subfrm, |
| 548 | enum Rate cur_rate) |
| 549 | { |
| 550 | int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; |
| 551 | const int16_t *cb_ptr; |
| 552 | int lag = pitch_lag + subfrm->ad_cb_lag - 1; |
| 553 | |
| 554 | int i; |
| 555 | int sum; |
| 556 | |
| 557 | get_residual(residual, prev_excitation, lag); |
| 558 | |
| 559 | /* Select quantization table */ |
| 560 | if (cur_rate == RATE_6300 && pitch_lag < SUBFRAME_LEN - 2) { |
| 561 | cb_ptr = adaptive_cb_gain85; |
| 562 | } else |
| 563 | cb_ptr = adaptive_cb_gain170; |
| 564 | |
| 565 | /* Calculate adaptive vector */ |
| 566 | cb_ptr += subfrm->ad_cb_gain * 20; |
| 567 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 568 | sum = ff_dot_product(residual + i, cb_ptr, PITCH_ORDER); |
| 569 | vector[i] = av_sat_dadd32(1 << 15, av_sat_add32(sum, sum)) >> 16; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | /** |
| 574 | * Estimate maximum auto-correlation around pitch lag. |
| 575 | * |
| 576 | * @param buf buffer with offset applied |
| 577 | * @param offset offset of the excitation vector |
| 578 | * @param ccr_max pointer to the maximum auto-correlation |
| 579 | * @param pitch_lag decoded pitch lag |
| 580 | * @param length length of autocorrelation |
| 581 | * @param dir forward lag(1) / backward lag(-1) |
| 582 | */ |
| 583 | static int autocorr_max(const int16_t *buf, int offset, int *ccr_max, |
| 584 | int pitch_lag, int length, int dir) |
| 585 | { |
| 586 | int limit, ccr, lag = 0; |
| 587 | int i; |
| 588 | |
| 589 | pitch_lag = FFMIN(PITCH_MAX - 3, pitch_lag); |
| 590 | if (dir > 0) |
| 591 | limit = FFMIN(FRAME_LEN + PITCH_MAX - offset - length, pitch_lag + 3); |
| 592 | else |
| 593 | limit = pitch_lag + 3; |
| 594 | |
| 595 | for (i = pitch_lag - 3; i <= limit; i++) { |
| 596 | ccr = dot_product(buf, buf + dir * i, length); |
| 597 | |
| 598 | if (ccr > *ccr_max) { |
| 599 | *ccr_max = ccr; |
| 600 | lag = i; |
| 601 | } |
| 602 | } |
| 603 | return lag; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * Calculate pitch postfilter optimal and scaling gains. |
| 608 | * |
| 609 | * @param lag pitch postfilter forward/backward lag |
| 610 | * @param ppf pitch postfilter parameters |
| 611 | * @param cur_rate current bitrate |
| 612 | * @param tgt_eng target energy |
| 613 | * @param ccr cross-correlation |
| 614 | * @param res_eng residual energy |
| 615 | */ |
| 616 | static void comp_ppf_gains(int lag, PPFParam *ppf, enum Rate cur_rate, |
| 617 | int tgt_eng, int ccr, int res_eng) |
| 618 | { |
| 619 | int pf_residual; /* square of postfiltered residual */ |
| 620 | int temp1, temp2; |
| 621 | |
| 622 | ppf->index = lag; |
| 623 | |
| 624 | temp1 = tgt_eng * res_eng >> 1; |
| 625 | temp2 = ccr * ccr << 1; |
| 626 | |
| 627 | if (temp2 > temp1) { |
| 628 | if (ccr >= res_eng) { |
| 629 | ppf->opt_gain = ppf_gain_weight[cur_rate]; |
| 630 | } else { |
| 631 | ppf->opt_gain = (ccr << 15) / res_eng * |
| 632 | ppf_gain_weight[cur_rate] >> 15; |
| 633 | } |
| 634 | /* pf_res^2 = tgt_eng + 2*ccr*gain + res_eng*gain^2 */ |
| 635 | temp1 = (tgt_eng << 15) + (ccr * ppf->opt_gain << 1); |
| 636 | temp2 = (ppf->opt_gain * ppf->opt_gain >> 15) * res_eng; |
| 637 | pf_residual = av_sat_add32(temp1, temp2 + (1 << 15)) >> 16; |
| 638 | |
| 639 | if (tgt_eng >= pf_residual << 1) { |
| 640 | temp1 = 0x7fff; |
| 641 | } else { |
| 642 | temp1 = (tgt_eng << 14) / pf_residual; |
| 643 | } |
| 644 | |
| 645 | /* scaling_gain = sqrt(tgt_eng/pf_res^2) */ |
| 646 | ppf->sc_gain = square_root(temp1 << 16); |
| 647 | } else { |
| 648 | ppf->opt_gain = 0; |
| 649 | ppf->sc_gain = 0x7fff; |
| 650 | } |
| 651 | |
| 652 | ppf->opt_gain = av_clip_int16(ppf->opt_gain * ppf->sc_gain >> 15); |
| 653 | } |
| 654 | |
| 655 | /** |
| 656 | * Calculate pitch postfilter parameters. |
| 657 | * |
| 658 | * @param p the context |
| 659 | * @param offset offset of the excitation vector |
| 660 | * @param pitch_lag decoded pitch lag |
| 661 | * @param ppf pitch postfilter parameters |
| 662 | * @param cur_rate current bitrate |
| 663 | */ |
| 664 | static void comp_ppf_coeff(G723_1_Context *p, int offset, int pitch_lag, |
| 665 | PPFParam *ppf, enum Rate cur_rate) |
| 666 | { |
| 667 | |
| 668 | int16_t scale; |
| 669 | int i; |
| 670 | int temp1, temp2; |
| 671 | |
| 672 | /* |
| 673 | * 0 - target energy |
| 674 | * 1 - forward cross-correlation |
| 675 | * 2 - forward residual energy |
| 676 | * 3 - backward cross-correlation |
| 677 | * 4 - backward residual energy |
| 678 | */ |
| 679 | int energy[5] = {0, 0, 0, 0, 0}; |
| 680 | int16_t *buf = p->audio + LPC_ORDER + offset; |
| 681 | int fwd_lag = autocorr_max(buf, offset, &energy[1], pitch_lag, |
| 682 | SUBFRAME_LEN, 1); |
| 683 | int back_lag = autocorr_max(buf, offset, &energy[3], pitch_lag, |
| 684 | SUBFRAME_LEN, -1); |
| 685 | |
| 686 | ppf->index = 0; |
| 687 | ppf->opt_gain = 0; |
| 688 | ppf->sc_gain = 0x7fff; |
| 689 | |
| 690 | /* Case 0, Section 3.6 */ |
| 691 | if (!back_lag && !fwd_lag) |
| 692 | return; |
| 693 | |
| 694 | /* Compute target energy */ |
| 695 | energy[0] = dot_product(buf, buf, SUBFRAME_LEN); |
| 696 | |
| 697 | /* Compute forward residual energy */ |
| 698 | if (fwd_lag) |
| 699 | energy[2] = dot_product(buf + fwd_lag, buf + fwd_lag, SUBFRAME_LEN); |
| 700 | |
| 701 | /* Compute backward residual energy */ |
| 702 | if (back_lag) |
| 703 | energy[4] = dot_product(buf - back_lag, buf - back_lag, SUBFRAME_LEN); |
| 704 | |
| 705 | /* Normalize and shorten */ |
| 706 | temp1 = 0; |
| 707 | for (i = 0; i < 5; i++) |
| 708 | temp1 = FFMAX(energy[i], temp1); |
| 709 | |
| 710 | scale = normalize_bits(temp1, 31); |
| 711 | for (i = 0; i < 5; i++) |
| 712 | energy[i] = (energy[i] << scale) >> 16; |
| 713 | |
| 714 | if (fwd_lag && !back_lag) { /* Case 1 */ |
| 715 | comp_ppf_gains(fwd_lag, ppf, cur_rate, energy[0], energy[1], |
| 716 | energy[2]); |
| 717 | } else if (!fwd_lag) { /* Case 2 */ |
| 718 | comp_ppf_gains(-back_lag, ppf, cur_rate, energy[0], energy[3], |
| 719 | energy[4]); |
| 720 | } else { /* Case 3 */ |
| 721 | |
| 722 | /* |
| 723 | * Select the largest of energy[1]^2/energy[2] |
| 724 | * and energy[3]^2/energy[4] |
| 725 | */ |
| 726 | temp1 = energy[4] * ((energy[1] * energy[1] + (1 << 14)) >> 15); |
| 727 | temp2 = energy[2] * ((energy[3] * energy[3] + (1 << 14)) >> 15); |
| 728 | if (temp1 >= temp2) { |
| 729 | comp_ppf_gains(fwd_lag, ppf, cur_rate, energy[0], energy[1], |
| 730 | energy[2]); |
| 731 | } else { |
| 732 | comp_ppf_gains(-back_lag, ppf, cur_rate, energy[0], energy[3], |
| 733 | energy[4]); |
| 734 | } |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | /** |
| 739 | * Classify frames as voiced/unvoiced. |
| 740 | * |
| 741 | * @param p the context |
| 742 | * @param pitch_lag decoded pitch_lag |
| 743 | * @param exc_eng excitation energy estimation |
| 744 | * @param scale scaling factor of exc_eng |
| 745 | * |
| 746 | * @return residual interpolation index if voiced, 0 otherwise |
| 747 | */ |
| 748 | static int comp_interp_index(G723_1_Context *p, int pitch_lag, |
| 749 | int *exc_eng, int *scale) |
| 750 | { |
| 751 | int offset = PITCH_MAX + 2 * SUBFRAME_LEN; |
| 752 | int16_t *buf = p->audio + LPC_ORDER; |
| 753 | |
| 754 | int index, ccr, tgt_eng, best_eng, temp; |
| 755 | |
| 756 | *scale = scale_vector(buf, p->excitation, FRAME_LEN + PITCH_MAX); |
| 757 | buf += offset; |
| 758 | |
| 759 | /* Compute maximum backward cross-correlation */ |
| 760 | ccr = 0; |
| 761 | index = autocorr_max(buf, offset, &ccr, pitch_lag, SUBFRAME_LEN * 2, -1); |
| 762 | ccr = av_sat_add32(ccr, 1 << 15) >> 16; |
| 763 | |
| 764 | /* Compute target energy */ |
| 765 | tgt_eng = dot_product(buf, buf, SUBFRAME_LEN * 2); |
| 766 | *exc_eng = av_sat_add32(tgt_eng, 1 << 15) >> 16; |
| 767 | |
| 768 | if (ccr <= 0) |
| 769 | return 0; |
| 770 | |
| 771 | /* Compute best energy */ |
| 772 | best_eng = dot_product(buf - index, buf - index, SUBFRAME_LEN * 2); |
| 773 | best_eng = av_sat_add32(best_eng, 1 << 15) >> 16; |
| 774 | |
| 775 | temp = best_eng * *exc_eng >> 3; |
| 776 | |
| 777 | if (temp < ccr * ccr) { |
| 778 | return index; |
| 779 | } else |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | /** |
| 784 | * Peform residual interpolation based on frame classification. |
| 785 | * |
| 786 | * @param buf decoded excitation vector |
| 787 | * @param out output vector |
| 788 | * @param lag decoded pitch lag |
| 789 | * @param gain interpolated gain |
| 790 | * @param rseed seed for random number generator |
| 791 | */ |
| 792 | static void residual_interp(int16_t *buf, int16_t *out, int lag, |
| 793 | int gain, int *rseed) |
| 794 | { |
| 795 | int i; |
| 796 | if (lag) { /* Voiced */ |
| 797 | int16_t *vector_ptr = buf + PITCH_MAX; |
| 798 | /* Attenuate */ |
| 799 | for (i = 0; i < lag; i++) |
| 800 | out[i] = vector_ptr[i - lag] * 3 >> 2; |
| 801 | av_memcpy_backptr((uint8_t*)(out + lag), lag * sizeof(*out), |
| 802 | (FRAME_LEN - lag) * sizeof(*out)); |
| 803 | } else { /* Unvoiced */ |
| 804 | for (i = 0; i < FRAME_LEN; i++) { |
| 805 | *rseed = *rseed * 521 + 259; |
| 806 | out[i] = gain * *rseed >> 15; |
| 807 | } |
| 808 | memset(buf, 0, (FRAME_LEN + PITCH_MAX) * sizeof(*buf)); |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | /** |
| 813 | * Perform IIR filtering. |
| 814 | * |
| 815 | * @param fir_coef FIR coefficients |
| 816 | * @param iir_coef IIR coefficients |
| 817 | * @param src source vector |
| 818 | * @param dest destination vector |
| 819 | * @param width width of the output, 16 bits(0) / 32 bits(1) |
| 820 | */ |
| 821 | #define iir_filter(fir_coef, iir_coef, src, dest, width)\ |
| 822 | {\ |
| 823 | int m, n;\ |
| 824 | int res_shift = 16 & ~-(width);\ |
| 825 | int in_shift = 16 - res_shift;\ |
| 826 | \ |
| 827 | for (m = 0; m < SUBFRAME_LEN; m++) {\ |
| 828 | int64_t filter = 0;\ |
| 829 | for (n = 1; n <= LPC_ORDER; n++) {\ |
| 830 | filter -= (fir_coef)[n - 1] * (src)[m - n] -\ |
| 831 | (iir_coef)[n - 1] * ((dest)[m - n] >> in_shift);\ |
| 832 | }\ |
| 833 | \ |
| 834 | (dest)[m] = av_clipl_int32(((src)[m] << 16) + (filter << 3) +\ |
| 835 | (1 << 15)) >> res_shift;\ |
| 836 | }\ |
| 837 | } |
| 838 | |
| 839 | /** |
| 840 | * Adjust gain of postfiltered signal. |
| 841 | * |
| 842 | * @param p the context |
| 843 | * @param buf postfiltered output vector |
| 844 | * @param energy input energy coefficient |
| 845 | */ |
| 846 | static void gain_scale(G723_1_Context *p, int16_t * buf, int energy) |
| 847 | { |
| 848 | int num, denom, gain, bits1, bits2; |
| 849 | int i; |
| 850 | |
| 851 | num = energy; |
| 852 | denom = 0; |
| 853 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 854 | int temp = buf[i] >> 2; |
| 855 | temp *= temp; |
| 856 | denom = av_sat_dadd32(denom, temp); |
| 857 | } |
| 858 | |
| 859 | if (num && denom) { |
| 860 | bits1 = normalize_bits(num, 31); |
| 861 | bits2 = normalize_bits(denom, 31); |
| 862 | num = num << bits1 >> 1; |
| 863 | denom <<= bits2; |
| 864 | |
| 865 | bits2 = 5 + bits1 - bits2; |
| 866 | bits2 = FFMAX(0, bits2); |
| 867 | |
| 868 | gain = (num >> 1) / (denom >> 16); |
| 869 | gain = square_root(gain << 16 >> bits2); |
| 870 | } else { |
| 871 | gain = 1 << 12; |
| 872 | } |
| 873 | |
| 874 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 875 | p->pf_gain = (15 * p->pf_gain + gain + (1 << 3)) >> 4; |
| 876 | buf[i] = av_clip_int16((buf[i] * (p->pf_gain + (p->pf_gain >> 4)) + |
| 877 | (1 << 10)) >> 11); |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | /** |
| 882 | * Perform formant filtering. |
| 883 | * |
| 884 | * @param p the context |
| 885 | * @param lpc quantized lpc coefficients |
| 886 | * @param buf input buffer |
| 887 | * @param dst output buffer |
| 888 | */ |
| 889 | static void formant_postfilter(G723_1_Context *p, int16_t *lpc, |
| 890 | int16_t *buf, int16_t *dst) |
| 891 | { |
| 892 | int16_t filter_coef[2][LPC_ORDER]; |
| 893 | int filter_signal[LPC_ORDER + FRAME_LEN], *signal_ptr; |
| 894 | int i, j, k; |
| 895 | |
| 896 | memcpy(buf, p->fir_mem, LPC_ORDER * sizeof(*buf)); |
| 897 | memcpy(filter_signal, p->iir_mem, LPC_ORDER * sizeof(*filter_signal)); |
| 898 | |
| 899 | for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { |
| 900 | for (k = 0; k < LPC_ORDER; k++) { |
| 901 | filter_coef[0][k] = (-lpc[k] * postfilter_tbl[0][k] + |
| 902 | (1 << 14)) >> 15; |
| 903 | filter_coef[1][k] = (-lpc[k] * postfilter_tbl[1][k] + |
| 904 | (1 << 14)) >> 15; |
| 905 | } |
| 906 | iir_filter(filter_coef[0], filter_coef[1], buf + i, |
| 907 | filter_signal + i, 1); |
| 908 | lpc += LPC_ORDER; |
| 909 | } |
| 910 | |
| 911 | memcpy(p->fir_mem, buf + FRAME_LEN, LPC_ORDER * sizeof(int16_t)); |
| 912 | memcpy(p->iir_mem, filter_signal + FRAME_LEN, LPC_ORDER * sizeof(int)); |
| 913 | |
| 914 | buf += LPC_ORDER; |
| 915 | signal_ptr = filter_signal + LPC_ORDER; |
| 916 | for (i = 0; i < SUBFRAMES; i++) { |
| 917 | int temp; |
| 918 | int auto_corr[2]; |
| 919 | int scale, energy; |
| 920 | |
| 921 | /* Normalize */ |
| 922 | scale = scale_vector(dst, buf, SUBFRAME_LEN); |
| 923 | |
| 924 | /* Compute auto correlation coefficients */ |
| 925 | auto_corr[0] = dot_product(dst, dst + 1, SUBFRAME_LEN - 1); |
| 926 | auto_corr[1] = dot_product(dst, dst, SUBFRAME_LEN); |
| 927 | |
| 928 | /* Compute reflection coefficient */ |
| 929 | temp = auto_corr[1] >> 16; |
| 930 | if (temp) { |
| 931 | temp = (auto_corr[0] >> 2) / temp; |
| 932 | } |
| 933 | p->reflection_coef = (3 * p->reflection_coef + temp + 2) >> 2; |
| 934 | temp = -p->reflection_coef >> 1 & ~3; |
| 935 | |
| 936 | /* Compensation filter */ |
| 937 | for (j = 0; j < SUBFRAME_LEN; j++) { |
| 938 | dst[j] = av_sat_dadd32(signal_ptr[j], |
| 939 | (signal_ptr[j - 1] >> 16) * temp) >> 16; |
| 940 | } |
| 941 | |
| 942 | /* Compute normalized signal energy */ |
| 943 | temp = 2 * scale + 4; |
| 944 | if (temp < 0) { |
| 945 | energy = av_clipl_int32((int64_t)auto_corr[1] << -temp); |
| 946 | } else |
| 947 | energy = auto_corr[1] >> temp; |
| 948 | |
| 949 | gain_scale(p, dst, energy); |
| 950 | |
| 951 | buf += SUBFRAME_LEN; |
| 952 | signal_ptr += SUBFRAME_LEN; |
| 953 | dst += SUBFRAME_LEN; |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | static int sid_gain_to_lsp_index(int gain) |
| 958 | { |
| 959 | if (gain < 0x10) |
| 960 | return gain << 6; |
| 961 | else if (gain < 0x20) |
| 962 | return gain - 8 << 7; |
| 963 | else |
| 964 | return gain - 20 << 8; |
| 965 | } |
| 966 | |
| 967 | static inline int cng_rand(int *state, int base) |
| 968 | { |
| 969 | *state = (*state * 521 + 259) & 0xFFFF; |
| 970 | return (*state & 0x7FFF) * base >> 15; |
| 971 | } |
| 972 | |
| 973 | static int estimate_sid_gain(G723_1_Context *p) |
| 974 | { |
| 975 | int i, shift, seg, seg2, t, val, val_add, x, y; |
| 976 | |
| 977 | shift = 16 - p->cur_gain * 2; |
| 978 | if (shift > 0) |
| 979 | t = p->sid_gain << shift; |
| 980 | else |
| 981 | t = p->sid_gain >> -shift; |
| 982 | x = t * cng_filt[0] >> 16; |
| 983 | |
| 984 | if (x >= cng_bseg[2]) |
| 985 | return 0x3F; |
| 986 | |
| 987 | if (x >= cng_bseg[1]) { |
| 988 | shift = 4; |
| 989 | seg = 3; |
| 990 | } else { |
| 991 | shift = 3; |
| 992 | seg = (x >= cng_bseg[0]); |
| 993 | } |
| 994 | seg2 = FFMIN(seg, 3); |
| 995 | |
| 996 | val = 1 << shift; |
| 997 | val_add = val >> 1; |
| 998 | for (i = 0; i < shift; i++) { |
| 999 | t = seg * 32 + (val << seg2); |
| 1000 | t *= t; |
| 1001 | if (x >= t) |
| 1002 | val += val_add; |
| 1003 | else |
| 1004 | val -= val_add; |
| 1005 | val_add >>= 1; |
| 1006 | } |
| 1007 | |
| 1008 | t = seg * 32 + (val << seg2); |
| 1009 | y = t * t - x; |
| 1010 | if (y <= 0) { |
| 1011 | t = seg * 32 + (val + 1 << seg2); |
| 1012 | t = t * t - x; |
| 1013 | val = (seg2 - 1 << 4) + val; |
| 1014 | if (t >= y) |
| 1015 | val++; |
| 1016 | } else { |
| 1017 | t = seg * 32 + (val - 1 << seg2); |
| 1018 | t = t * t - x; |
| 1019 | val = (seg2 - 1 << 4) + val; |
| 1020 | if (t >= y) |
| 1021 | val--; |
| 1022 | } |
| 1023 | |
| 1024 | return val; |
| 1025 | } |
| 1026 | |
| 1027 | static void generate_noise(G723_1_Context *p) |
| 1028 | { |
| 1029 | int i, j, idx, t; |
| 1030 | int off[SUBFRAMES]; |
| 1031 | int signs[SUBFRAMES / 2 * 11], pos[SUBFRAMES / 2 * 11]; |
| 1032 | int tmp[SUBFRAME_LEN * 2]; |
| 1033 | int16_t *vector_ptr; |
| 1034 | int64_t sum; |
| 1035 | int b0, c, delta, x, shift; |
| 1036 | |
| 1037 | p->pitch_lag[0] = cng_rand(&p->cng_random_seed, 21) + 123; |
| 1038 | p->pitch_lag[1] = cng_rand(&p->cng_random_seed, 19) + 123; |
| 1039 | |
| 1040 | for (i = 0; i < SUBFRAMES; i++) { |
| 1041 | p->subframe[i].ad_cb_gain = cng_rand(&p->cng_random_seed, 50) + 1; |
| 1042 | p->subframe[i].ad_cb_lag = cng_adaptive_cb_lag[i]; |
| 1043 | } |
| 1044 | |
| 1045 | for (i = 0; i < SUBFRAMES / 2; i++) { |
| 1046 | t = cng_rand(&p->cng_random_seed, 1 << 13); |
| 1047 | off[i * 2] = t & 1; |
| 1048 | off[i * 2 + 1] = ((t >> 1) & 1) + SUBFRAME_LEN; |
| 1049 | t >>= 2; |
| 1050 | for (j = 0; j < 11; j++) { |
| 1051 | signs[i * 11 + j] = (t & 1) * 2 - 1 << 14; |
| 1052 | t >>= 1; |
| 1053 | } |
| 1054 | } |
| 1055 | |
| 1056 | idx = 0; |
| 1057 | for (i = 0; i < SUBFRAMES; i++) { |
| 1058 | for (j = 0; j < SUBFRAME_LEN / 2; j++) |
| 1059 | tmp[j] = j; |
| 1060 | t = SUBFRAME_LEN / 2; |
| 1061 | for (j = 0; j < pulses[i]; j++, idx++) { |
| 1062 | int idx2 = cng_rand(&p->cng_random_seed, t); |
| 1063 | |
| 1064 | pos[idx] = tmp[idx2] * 2 + off[i]; |
| 1065 | tmp[idx2] = tmp[--t]; |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | vector_ptr = p->audio + LPC_ORDER; |
| 1070 | memcpy(vector_ptr, p->prev_excitation, |
| 1071 | PITCH_MAX * sizeof(*p->excitation)); |
| 1072 | for (i = 0; i < SUBFRAMES; i += 2) { |
| 1073 | gen_acb_excitation(vector_ptr, vector_ptr, |
| 1074 | p->pitch_lag[i >> 1], &p->subframe[i], |
| 1075 | p->cur_rate); |
| 1076 | gen_acb_excitation(vector_ptr + SUBFRAME_LEN, |
| 1077 | vector_ptr + SUBFRAME_LEN, |
| 1078 | p->pitch_lag[i >> 1], &p->subframe[i + 1], |
| 1079 | p->cur_rate); |
| 1080 | |
| 1081 | t = 0; |
| 1082 | for (j = 0; j < SUBFRAME_LEN * 2; j++) |
| 1083 | t |= FFABS(vector_ptr[j]); |
| 1084 | t = FFMIN(t, 0x7FFF); |
| 1085 | if (!t) { |
| 1086 | shift = 0; |
| 1087 | } else { |
| 1088 | shift = -10 + av_log2(t); |
| 1089 | if (shift < -2) |
| 1090 | shift = -2; |
| 1091 | } |
| 1092 | sum = 0; |
| 1093 | if (shift < 0) { |
| 1094 | for (j = 0; j < SUBFRAME_LEN * 2; j++) { |
| 1095 | t = vector_ptr[j] << -shift; |
| 1096 | sum += t * t; |
| 1097 | tmp[j] = t; |
| 1098 | } |
| 1099 | } else { |
| 1100 | for (j = 0; j < SUBFRAME_LEN * 2; j++) { |
| 1101 | t = vector_ptr[j] >> shift; |
| 1102 | sum += t * t; |
| 1103 | tmp[j] = t; |
| 1104 | } |
| 1105 | } |
| 1106 | |
| 1107 | b0 = 0; |
| 1108 | for (j = 0; j < 11; j++) |
| 1109 | b0 += tmp[pos[(i / 2) * 11 + j]] * signs[(i / 2) * 11 + j]; |
| 1110 | b0 = b0 * 2 * 2979LL + (1 << 29) >> 30; // approximated division by 11 |
| 1111 | |
| 1112 | c = p->cur_gain * (p->cur_gain * SUBFRAME_LEN >> 5); |
| 1113 | if (shift * 2 + 3 >= 0) |
| 1114 | c >>= shift * 2 + 3; |
| 1115 | else |
| 1116 | c <<= -(shift * 2 + 3); |
| 1117 | c = (av_clipl_int32(sum << 1) - c) * 2979LL >> 15; |
| 1118 | |
| 1119 | delta = b0 * b0 * 2 - c; |
| 1120 | if (delta <= 0) { |
| 1121 | x = -b0; |
| 1122 | } else { |
| 1123 | delta = square_root(delta); |
| 1124 | x = delta - b0; |
| 1125 | t = delta + b0; |
| 1126 | if (FFABS(t) < FFABS(x)) |
| 1127 | x = -t; |
| 1128 | } |
| 1129 | shift++; |
| 1130 | if (shift < 0) |
| 1131 | x >>= -shift; |
| 1132 | else |
| 1133 | x <<= shift; |
| 1134 | x = av_clip(x, -10000, 10000); |
| 1135 | |
| 1136 | for (j = 0; j < 11; j++) { |
| 1137 | idx = (i / 2) * 11 + j; |
| 1138 | vector_ptr[pos[idx]] = av_clip_int16(vector_ptr[pos[idx]] + |
| 1139 | (x * signs[idx] >> 15)); |
| 1140 | } |
| 1141 | |
| 1142 | /* copy decoded data to serve as a history for the next decoded subframes */ |
| 1143 | memcpy(vector_ptr + PITCH_MAX, vector_ptr, |
| 1144 | sizeof(*vector_ptr) * SUBFRAME_LEN * 2); |
| 1145 | vector_ptr += SUBFRAME_LEN * 2; |
| 1146 | } |
| 1147 | /* Save the excitation for the next frame */ |
| 1148 | memcpy(p->prev_excitation, p->audio + LPC_ORDER + FRAME_LEN, |
| 1149 | PITCH_MAX * sizeof(*p->excitation)); |
| 1150 | } |
| 1151 | |
| 1152 | static int g723_1_decode_frame(AVCodecContext *avctx, void *data, |
| 1153 | int *got_frame_ptr, AVPacket *avpkt) |
| 1154 | { |
| 1155 | G723_1_Context *p = avctx->priv_data; |
| 1156 | AVFrame *frame = data; |
| 1157 | const uint8_t *buf = avpkt->data; |
| 1158 | int buf_size = avpkt->size; |
| 1159 | int dec_mode = buf[0] & 3; |
| 1160 | |
| 1161 | PPFParam ppf[SUBFRAMES]; |
| 1162 | int16_t cur_lsp[LPC_ORDER]; |
| 1163 | int16_t lpc[SUBFRAMES * LPC_ORDER]; |
| 1164 | int16_t acb_vector[SUBFRAME_LEN]; |
| 1165 | int16_t *out; |
| 1166 | int bad_frame = 0, i, j, ret; |
| 1167 | int16_t *audio = p->audio; |
| 1168 | |
| 1169 | if (buf_size < frame_size[dec_mode]) { |
| 1170 | if (buf_size) |
| 1171 | av_log(avctx, AV_LOG_WARNING, |
| 1172 | "Expected %d bytes, got %d - skipping packet\n", |
| 1173 | frame_size[dec_mode], buf_size); |
| 1174 | *got_frame_ptr = 0; |
| 1175 | return buf_size; |
| 1176 | } |
| 1177 | |
| 1178 | if (unpack_bitstream(p, buf, buf_size) < 0) { |
| 1179 | bad_frame = 1; |
| 1180 | if (p->past_frame_type == ACTIVE_FRAME) |
| 1181 | p->cur_frame_type = ACTIVE_FRAME; |
| 1182 | else |
| 1183 | p->cur_frame_type = UNTRANSMITTED_FRAME; |
| 1184 | } |
| 1185 | |
| 1186 | frame->nb_samples = FRAME_LEN; |
| 1187 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 1188 | return ret; |
| 1189 | |
| 1190 | out = (int16_t *)frame->data[0]; |
| 1191 | |
| 1192 | if (p->cur_frame_type == ACTIVE_FRAME) { |
| 1193 | if (!bad_frame) |
| 1194 | p->erased_frames = 0; |
| 1195 | else if (p->erased_frames != 3) |
| 1196 | p->erased_frames++; |
| 1197 | |
| 1198 | inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, bad_frame); |
| 1199 | lsp_interpolate(lpc, cur_lsp, p->prev_lsp); |
| 1200 | |
| 1201 | /* Save the lsp_vector for the next frame */ |
| 1202 | memcpy(p->prev_lsp, cur_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); |
| 1203 | |
| 1204 | /* Generate the excitation for the frame */ |
| 1205 | memcpy(p->excitation, p->prev_excitation, |
| 1206 | PITCH_MAX * sizeof(*p->excitation)); |
| 1207 | if (!p->erased_frames) { |
| 1208 | int16_t *vector_ptr = p->excitation + PITCH_MAX; |
| 1209 | |
| 1210 | /* Update interpolation gain memory */ |
| 1211 | p->interp_gain = fixed_cb_gain[(p->subframe[2].amp_index + |
| 1212 | p->subframe[3].amp_index) >> 1]; |
| 1213 | for (i = 0; i < SUBFRAMES; i++) { |
| 1214 | gen_fcb_excitation(vector_ptr, &p->subframe[i], p->cur_rate, |
| 1215 | p->pitch_lag[i >> 1], i); |
| 1216 | gen_acb_excitation(acb_vector, &p->excitation[SUBFRAME_LEN * i], |
| 1217 | p->pitch_lag[i >> 1], &p->subframe[i], |
| 1218 | p->cur_rate); |
| 1219 | /* Get the total excitation */ |
| 1220 | for (j = 0; j < SUBFRAME_LEN; j++) { |
| 1221 | int v = av_clip_int16(vector_ptr[j] << 1); |
| 1222 | vector_ptr[j] = av_clip_int16(v + acb_vector[j]); |
| 1223 | } |
| 1224 | vector_ptr += SUBFRAME_LEN; |
| 1225 | } |
| 1226 | |
| 1227 | vector_ptr = p->excitation + PITCH_MAX; |
| 1228 | |
| 1229 | p->interp_index = comp_interp_index(p, p->pitch_lag[1], |
| 1230 | &p->sid_gain, &p->cur_gain); |
| 1231 | |
| 1232 | /* Peform pitch postfiltering */ |
| 1233 | if (p->postfilter) { |
| 1234 | i = PITCH_MAX; |
| 1235 | for (j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) |
| 1236 | comp_ppf_coeff(p, i, p->pitch_lag[j >> 1], |
| 1237 | ppf + j, p->cur_rate); |
| 1238 | |
| 1239 | for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) |
| 1240 | ff_acelp_weighted_vector_sum(p->audio + LPC_ORDER + i, |
| 1241 | vector_ptr + i, |
| 1242 | vector_ptr + i + ppf[j].index, |
| 1243 | ppf[j].sc_gain, |
| 1244 | ppf[j].opt_gain, |
| 1245 | 1 << 14, 15, SUBFRAME_LEN); |
| 1246 | } else { |
| 1247 | audio = vector_ptr - LPC_ORDER; |
| 1248 | } |
| 1249 | |
| 1250 | /* Save the excitation for the next frame */ |
| 1251 | memcpy(p->prev_excitation, p->excitation + FRAME_LEN, |
| 1252 | PITCH_MAX * sizeof(*p->excitation)); |
| 1253 | } else { |
| 1254 | p->interp_gain = (p->interp_gain * 3 + 2) >> 2; |
| 1255 | if (p->erased_frames == 3) { |
| 1256 | /* Mute output */ |
| 1257 | memset(p->excitation, 0, |
| 1258 | (FRAME_LEN + PITCH_MAX) * sizeof(*p->excitation)); |
| 1259 | memset(p->prev_excitation, 0, |
| 1260 | PITCH_MAX * sizeof(*p->excitation)); |
| 1261 | memset(frame->data[0], 0, |
| 1262 | (FRAME_LEN + LPC_ORDER) * sizeof(int16_t)); |
| 1263 | } else { |
| 1264 | int16_t *buf = p->audio + LPC_ORDER; |
| 1265 | |
| 1266 | /* Regenerate frame */ |
| 1267 | residual_interp(p->excitation, buf, p->interp_index, |
| 1268 | p->interp_gain, &p->random_seed); |
| 1269 | |
| 1270 | /* Save the excitation for the next frame */ |
| 1271 | memcpy(p->prev_excitation, buf + (FRAME_LEN - PITCH_MAX), |
| 1272 | PITCH_MAX * sizeof(*p->excitation)); |
| 1273 | } |
| 1274 | } |
| 1275 | p->cng_random_seed = CNG_RANDOM_SEED; |
| 1276 | } else { |
| 1277 | if (p->cur_frame_type == SID_FRAME) { |
| 1278 | p->sid_gain = sid_gain_to_lsp_index(p->subframe[0].amp_index); |
| 1279 | inverse_quant(p->sid_lsp, p->prev_lsp, p->lsp_index, 0); |
| 1280 | } else if (p->past_frame_type == ACTIVE_FRAME) { |
| 1281 | p->sid_gain = estimate_sid_gain(p); |
| 1282 | } |
| 1283 | |
| 1284 | if (p->past_frame_type == ACTIVE_FRAME) |
| 1285 | p->cur_gain = p->sid_gain; |
| 1286 | else |
| 1287 | p->cur_gain = (p->cur_gain * 7 + p->sid_gain) >> 3; |
| 1288 | generate_noise(p); |
| 1289 | lsp_interpolate(lpc, p->sid_lsp, p->prev_lsp); |
| 1290 | /* Save the lsp_vector for the next frame */ |
| 1291 | memcpy(p->prev_lsp, p->sid_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); |
| 1292 | } |
| 1293 | |
| 1294 | p->past_frame_type = p->cur_frame_type; |
| 1295 | |
| 1296 | memcpy(p->audio, p->synth_mem, LPC_ORDER * sizeof(*p->audio)); |
| 1297 | for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) |
| 1298 | ff_celp_lp_synthesis_filter(p->audio + i, &lpc[j * LPC_ORDER], |
| 1299 | audio + i, SUBFRAME_LEN, LPC_ORDER, |
| 1300 | 0, 1, 1 << 12); |
| 1301 | memcpy(p->synth_mem, p->audio + FRAME_LEN, LPC_ORDER * sizeof(*p->audio)); |
| 1302 | |
| 1303 | if (p->postfilter) { |
| 1304 | formant_postfilter(p, lpc, p->audio, out); |
| 1305 | } else { // if output is not postfiltered it should be scaled by 2 |
| 1306 | for (i = 0; i < FRAME_LEN; i++) |
| 1307 | out[i] = av_clip_int16(p->audio[LPC_ORDER + i] << 1); |
| 1308 | } |
| 1309 | |
| 1310 | *got_frame_ptr = 1; |
| 1311 | |
| 1312 | return frame_size[dec_mode]; |
| 1313 | } |
| 1314 | |
| 1315 | #define OFFSET(x) offsetof(G723_1_Context, x) |
| 1316 | #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM |
| 1317 | |
| 1318 | static const AVOption options[] = { |
| 1319 | { "postfilter", "postfilter on/off", OFFSET(postfilter), AV_OPT_TYPE_INT, |
| 1320 | { .i64 = 1 }, 0, 1, AD }, |
| 1321 | { NULL } |
| 1322 | }; |
| 1323 | |
| 1324 | |
| 1325 | static const AVClass g723_1dec_class = { |
| 1326 | .class_name = "G.723.1 decoder", |
| 1327 | .item_name = av_default_item_name, |
| 1328 | .option = options, |
| 1329 | .version = LIBAVUTIL_VERSION_INT, |
| 1330 | }; |
| 1331 | |
| 1332 | AVCodec ff_g723_1_decoder = { |
| 1333 | .name = "g723_1", |
| 1334 | .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), |
| 1335 | .type = AVMEDIA_TYPE_AUDIO, |
| 1336 | .id = AV_CODEC_ID_G723_1, |
| 1337 | .priv_data_size = sizeof(G723_1_Context), |
| 1338 | .init = g723_1_decode_init, |
| 1339 | .decode = g723_1_decode_frame, |
| 1340 | .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, |
| 1341 | .priv_class = &g723_1dec_class, |
| 1342 | }; |
| 1343 | |
| 1344 | #if CONFIG_G723_1_ENCODER |
| 1345 | #define BITSTREAM_WRITER_LE |
| 1346 | #include "put_bits.h" |
| 1347 | |
| 1348 | static av_cold int g723_1_encode_init(AVCodecContext *avctx) |
| 1349 | { |
| 1350 | G723_1_Context *p = avctx->priv_data; |
| 1351 | |
| 1352 | if (avctx->sample_rate != 8000) { |
| 1353 | av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); |
| 1354 | return -1; |
| 1355 | } |
| 1356 | |
| 1357 | if (avctx->channels != 1) { |
| 1358 | av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); |
| 1359 | return AVERROR(EINVAL); |
| 1360 | } |
| 1361 | |
| 1362 | if (avctx->bit_rate == 6300) { |
| 1363 | p->cur_rate = RATE_6300; |
| 1364 | } else if (avctx->bit_rate == 5300) { |
| 1365 | av_log(avctx, AV_LOG_ERROR, "Bitrate not supported yet, use 6.3k\n"); |
| 1366 | return AVERROR_PATCHWELCOME; |
| 1367 | } else { |
| 1368 | av_log(avctx, AV_LOG_ERROR, |
| 1369 | "Bitrate not supported, use 6.3k\n"); |
| 1370 | return AVERROR(EINVAL); |
| 1371 | } |
| 1372 | avctx->frame_size = 240; |
| 1373 | memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(int16_t)); |
| 1374 | |
| 1375 | return 0; |
| 1376 | } |
| 1377 | |
| 1378 | /** |
| 1379 | * Remove DC component from the input signal. |
| 1380 | * |
| 1381 | * @param buf input signal |
| 1382 | * @param fir zero memory |
| 1383 | * @param iir pole memory |
| 1384 | */ |
| 1385 | static void highpass_filter(int16_t *buf, int16_t *fir, int *iir) |
| 1386 | { |
| 1387 | int i; |
| 1388 | for (i = 0; i < FRAME_LEN; i++) { |
| 1389 | *iir = (buf[i] << 15) + ((-*fir) << 15) + MULL2(*iir, 0x7f00); |
| 1390 | *fir = buf[i]; |
| 1391 | buf[i] = av_clipl_int32((int64_t)*iir + (1 << 15)) >> 16; |
| 1392 | } |
| 1393 | } |
| 1394 | |
| 1395 | /** |
| 1396 | * Estimate autocorrelation of the input vector. |
| 1397 | * |
| 1398 | * @param buf input buffer |
| 1399 | * @param autocorr autocorrelation coefficients vector |
| 1400 | */ |
| 1401 | static void comp_autocorr(int16_t *buf, int16_t *autocorr) |
| 1402 | { |
| 1403 | int i, scale, temp; |
| 1404 | int16_t vector[LPC_FRAME]; |
| 1405 | |
| 1406 | scale_vector(vector, buf, LPC_FRAME); |
| 1407 | |
| 1408 | /* Apply the Hamming window */ |
| 1409 | for (i = 0; i < LPC_FRAME; i++) |
| 1410 | vector[i] = (vector[i] * hamming_window[i] + (1 << 14)) >> 15; |
| 1411 | |
| 1412 | /* Compute the first autocorrelation coefficient */ |
| 1413 | temp = ff_dot_product(vector, vector, LPC_FRAME); |
| 1414 | |
| 1415 | /* Apply a white noise correlation factor of (1025/1024) */ |
| 1416 | temp += temp >> 10; |
| 1417 | |
| 1418 | /* Normalize */ |
| 1419 | scale = normalize_bits_int32(temp); |
| 1420 | autocorr[0] = av_clipl_int32((int64_t)(temp << scale) + |
| 1421 | (1 << 15)) >> 16; |
| 1422 | |
| 1423 | /* Compute the remaining coefficients */ |
| 1424 | if (!autocorr[0]) { |
| 1425 | memset(autocorr + 1, 0, LPC_ORDER * sizeof(int16_t)); |
| 1426 | } else { |
| 1427 | for (i = 1; i <= LPC_ORDER; i++) { |
| 1428 | temp = ff_dot_product(vector, vector + i, LPC_FRAME - i); |
| 1429 | temp = MULL2((temp << scale), binomial_window[i - 1]); |
| 1430 | autocorr[i] = av_clipl_int32((int64_t)temp + (1 << 15)) >> 16; |
| 1431 | } |
| 1432 | } |
| 1433 | } |
| 1434 | |
| 1435 | /** |
| 1436 | * Use Levinson-Durbin recursion to compute LPC coefficients from |
| 1437 | * autocorrelation values. |
| 1438 | * |
| 1439 | * @param lpc LPC coefficients vector |
| 1440 | * @param autocorr autocorrelation coefficients vector |
| 1441 | * @param error prediction error |
| 1442 | */ |
| 1443 | static void levinson_durbin(int16_t *lpc, int16_t *autocorr, int16_t error) |
| 1444 | { |
| 1445 | int16_t vector[LPC_ORDER]; |
| 1446 | int16_t partial_corr; |
| 1447 | int i, j, temp; |
| 1448 | |
| 1449 | memset(lpc, 0, LPC_ORDER * sizeof(int16_t)); |
| 1450 | |
| 1451 | for (i = 0; i < LPC_ORDER; i++) { |
| 1452 | /* Compute the partial correlation coefficient */ |
| 1453 | temp = 0; |
| 1454 | for (j = 0; j < i; j++) |
| 1455 | temp -= lpc[j] * autocorr[i - j - 1]; |
| 1456 | temp = ((autocorr[i] << 13) + temp) << 3; |
| 1457 | |
| 1458 | if (FFABS(temp) >= (error << 16)) |
| 1459 | break; |
| 1460 | |
| 1461 | partial_corr = temp / (error << 1); |
| 1462 | |
| 1463 | lpc[i] = av_clipl_int32((int64_t)(partial_corr << 14) + |
| 1464 | (1 << 15)) >> 16; |
| 1465 | |
| 1466 | /* Update the prediction error */ |
| 1467 | temp = MULL2(temp, partial_corr); |
| 1468 | error = av_clipl_int32((int64_t)(error << 16) - temp + |
| 1469 | (1 << 15)) >> 16; |
| 1470 | |
| 1471 | memcpy(vector, lpc, i * sizeof(int16_t)); |
| 1472 | for (j = 0; j < i; j++) { |
| 1473 | temp = partial_corr * vector[i - j - 1] << 1; |
| 1474 | lpc[j] = av_clipl_int32((int64_t)(lpc[j] << 16) - temp + |
| 1475 | (1 << 15)) >> 16; |
| 1476 | } |
| 1477 | } |
| 1478 | } |
| 1479 | |
| 1480 | /** |
| 1481 | * Calculate LPC coefficients for the current frame. |
| 1482 | * |
| 1483 | * @param buf current frame |
| 1484 | * @param prev_data 2 trailing subframes of the previous frame |
| 1485 | * @param lpc LPC coefficients vector |
| 1486 | */ |
| 1487 | static void comp_lpc_coeff(int16_t *buf, int16_t *lpc) |
| 1488 | { |
| 1489 | int16_t autocorr[(LPC_ORDER + 1) * SUBFRAMES]; |
| 1490 | int16_t *autocorr_ptr = autocorr; |
| 1491 | int16_t *lpc_ptr = lpc; |
| 1492 | int i, j; |
| 1493 | |
| 1494 | for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { |
| 1495 | comp_autocorr(buf + i, autocorr_ptr); |
| 1496 | levinson_durbin(lpc_ptr, autocorr_ptr + 1, autocorr_ptr[0]); |
| 1497 | |
| 1498 | lpc_ptr += LPC_ORDER; |
| 1499 | autocorr_ptr += LPC_ORDER + 1; |
| 1500 | } |
| 1501 | } |
| 1502 | |
| 1503 | static void lpc2lsp(int16_t *lpc, int16_t *prev_lsp, int16_t *lsp) |
| 1504 | { |
| 1505 | int f[LPC_ORDER + 2]; ///< coefficients of the sum and difference |
| 1506 | ///< polynomials (F1, F2) ordered as |
| 1507 | ///< f1[0], f2[0], ...., f1[5], f2[5] |
| 1508 | |
| 1509 | int max, shift, cur_val, prev_val, count, p; |
| 1510 | int i, j; |
| 1511 | int64_t temp; |
| 1512 | |
| 1513 | /* Initialize f1[0] and f2[0] to 1 in Q25 */ |
| 1514 | for (i = 0; i < LPC_ORDER; i++) |
| 1515 | lsp[i] = (lpc[i] * bandwidth_expand[i] + (1 << 14)) >> 15; |
| 1516 | |
| 1517 | /* Apply bandwidth expansion on the LPC coefficients */ |
| 1518 | f[0] = f[1] = 1 << 25; |
| 1519 | |
| 1520 | /* Compute the remaining coefficients */ |
| 1521 | for (i = 0; i < LPC_ORDER / 2; i++) { |
| 1522 | /* f1 */ |
| 1523 | f[2 * i + 2] = -f[2 * i] - ((lsp[i] + lsp[LPC_ORDER - 1 - i]) << 12); |
| 1524 | /* f2 */ |
| 1525 | f[2 * i + 3] = f[2 * i + 1] - ((lsp[i] - lsp[LPC_ORDER - 1 - i]) << 12); |
| 1526 | } |
| 1527 | |
| 1528 | /* Divide f1[5] and f2[5] by 2 for use in polynomial evaluation */ |
| 1529 | f[LPC_ORDER] >>= 1; |
| 1530 | f[LPC_ORDER + 1] >>= 1; |
| 1531 | |
| 1532 | /* Normalize and shorten */ |
| 1533 | max = FFABS(f[0]); |
| 1534 | for (i = 1; i < LPC_ORDER + 2; i++) |
| 1535 | max = FFMAX(max, FFABS(f[i])); |
| 1536 | |
| 1537 | shift = normalize_bits_int32(max); |
| 1538 | |
| 1539 | for (i = 0; i < LPC_ORDER + 2; i++) |
| 1540 | f[i] = av_clipl_int32((int64_t)(f[i] << shift) + (1 << 15)) >> 16; |
| 1541 | |
| 1542 | /** |
| 1543 | * Evaluate F1 and F2 at uniform intervals of pi/256 along the |
| 1544 | * unit circle and check for zero crossings. |
| 1545 | */ |
| 1546 | p = 0; |
| 1547 | temp = 0; |
| 1548 | for (i = 0; i <= LPC_ORDER / 2; i++) |
| 1549 | temp += f[2 * i] * cos_tab[0]; |
| 1550 | prev_val = av_clipl_int32(temp << 1); |
| 1551 | count = 0; |
| 1552 | for ( i = 1; i < COS_TBL_SIZE / 2; i++) { |
| 1553 | /* Evaluate */ |
| 1554 | temp = 0; |
| 1555 | for (j = 0; j <= LPC_ORDER / 2; j++) |
| 1556 | temp += f[LPC_ORDER - 2 * j + p] * cos_tab[i * j % COS_TBL_SIZE]; |
| 1557 | cur_val = av_clipl_int32(temp << 1); |
| 1558 | |
| 1559 | /* Check for sign change, indicating a zero crossing */ |
| 1560 | if ((cur_val ^ prev_val) < 0) { |
| 1561 | int abs_cur = FFABS(cur_val); |
| 1562 | int abs_prev = FFABS(prev_val); |
| 1563 | int sum = abs_cur + abs_prev; |
| 1564 | |
| 1565 | shift = normalize_bits_int32(sum); |
| 1566 | sum <<= shift; |
| 1567 | abs_prev = abs_prev << shift >> 8; |
| 1568 | lsp[count++] = ((i - 1) << 7) + (abs_prev >> 1) / (sum >> 16); |
| 1569 | |
| 1570 | if (count == LPC_ORDER) |
| 1571 | break; |
| 1572 | |
| 1573 | /* Switch between sum and difference polynomials */ |
| 1574 | p ^= 1; |
| 1575 | |
| 1576 | /* Evaluate */ |
| 1577 | temp = 0; |
| 1578 | for (j = 0; j <= LPC_ORDER / 2; j++){ |
| 1579 | temp += f[LPC_ORDER - 2 * j + p] * |
| 1580 | cos_tab[i * j % COS_TBL_SIZE]; |
| 1581 | } |
| 1582 | cur_val = av_clipl_int32(temp<<1); |
| 1583 | } |
| 1584 | prev_val = cur_val; |
| 1585 | } |
| 1586 | |
| 1587 | if (count != LPC_ORDER) |
| 1588 | memcpy(lsp, prev_lsp, LPC_ORDER * sizeof(int16_t)); |
| 1589 | } |
| 1590 | |
| 1591 | /** |
| 1592 | * Quantize the current LSP subvector. |
| 1593 | * |
| 1594 | * @param num band number |
| 1595 | * @param offset offset of the current subvector in an LPC_ORDER vector |
| 1596 | * @param size size of the current subvector |
| 1597 | */ |
| 1598 | #define get_index(num, offset, size) \ |
| 1599 | {\ |
| 1600 | int error, max = -1;\ |
| 1601 | int16_t temp[4];\ |
| 1602 | int i, j;\ |
| 1603 | for (i = 0; i < LSP_CB_SIZE; i++) {\ |
| 1604 | for (j = 0; j < size; j++){\ |
| 1605 | temp[j] = (weight[j + (offset)] * lsp_band##num[i][j] +\ |
| 1606 | (1 << 14)) >> 15;\ |
| 1607 | }\ |
| 1608 | error = dot_product(lsp + (offset), temp, size) << 1;\ |
| 1609 | error -= dot_product(lsp_band##num[i], temp, size);\ |
| 1610 | if (error > max) {\ |
| 1611 | max = error;\ |
| 1612 | lsp_index[num] = i;\ |
| 1613 | }\ |
| 1614 | }\ |
| 1615 | } |
| 1616 | |
| 1617 | /** |
| 1618 | * Vector quantize the LSP frequencies. |
| 1619 | * |
| 1620 | * @param lsp the current lsp vector |
| 1621 | * @param prev_lsp the previous lsp vector |
| 1622 | */ |
| 1623 | static void lsp_quantize(uint8_t *lsp_index, int16_t *lsp, int16_t *prev_lsp) |
| 1624 | { |
| 1625 | int16_t weight[LPC_ORDER]; |
| 1626 | int16_t min, max; |
| 1627 | int shift, i; |
| 1628 | |
| 1629 | /* Calculate the VQ weighting vector */ |
| 1630 | weight[0] = (1 << 20) / (lsp[1] - lsp[0]); |
| 1631 | weight[LPC_ORDER - 1] = (1 << 20) / |
| 1632 | (lsp[LPC_ORDER - 1] - lsp[LPC_ORDER - 2]); |
| 1633 | |
| 1634 | for (i = 1; i < LPC_ORDER - 1; i++) { |
| 1635 | min = FFMIN(lsp[i] - lsp[i - 1], lsp[i + 1] - lsp[i]); |
| 1636 | if (min > 0x20) |
| 1637 | weight[i] = (1 << 20) / min; |
| 1638 | else |
| 1639 | weight[i] = INT16_MAX; |
| 1640 | } |
| 1641 | |
| 1642 | /* Normalize */ |
| 1643 | max = 0; |
| 1644 | for (i = 0; i < LPC_ORDER; i++) |
| 1645 | max = FFMAX(weight[i], max); |
| 1646 | |
| 1647 | shift = normalize_bits_int16(max); |
| 1648 | for (i = 0; i < LPC_ORDER; i++) { |
| 1649 | weight[i] <<= shift; |
| 1650 | } |
| 1651 | |
| 1652 | /* Compute the VQ target vector */ |
| 1653 | for (i = 0; i < LPC_ORDER; i++) { |
| 1654 | lsp[i] -= dc_lsp[i] + |
| 1655 | (((prev_lsp[i] - dc_lsp[i]) * 12288 + (1 << 14)) >> 15); |
| 1656 | } |
| 1657 | |
| 1658 | get_index(0, 0, 3); |
| 1659 | get_index(1, 3, 3); |
| 1660 | get_index(2, 6, 4); |
| 1661 | } |
| 1662 | |
| 1663 | /** |
| 1664 | * Apply the formant perceptual weighting filter. |
| 1665 | * |
| 1666 | * @param flt_coef filter coefficients |
| 1667 | * @param unq_lpc unquantized lpc vector |
| 1668 | */ |
| 1669 | static void perceptual_filter(G723_1_Context *p, int16_t *flt_coef, |
| 1670 | int16_t *unq_lpc, int16_t *buf) |
| 1671 | { |
| 1672 | int16_t vector[FRAME_LEN + LPC_ORDER]; |
| 1673 | int i, j, k, l = 0; |
| 1674 | |
| 1675 | memcpy(buf, p->iir_mem, sizeof(int16_t) * LPC_ORDER); |
| 1676 | memcpy(vector, p->fir_mem, sizeof(int16_t) * LPC_ORDER); |
| 1677 | memcpy(vector + LPC_ORDER, buf + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); |
| 1678 | |
| 1679 | for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { |
| 1680 | for (k = 0; k < LPC_ORDER; k++) { |
| 1681 | flt_coef[k + 2 * l] = (unq_lpc[k + l] * percept_flt_tbl[0][k] + |
| 1682 | (1 << 14)) >> 15; |
| 1683 | flt_coef[k + 2 * l + LPC_ORDER] = (unq_lpc[k + l] * |
| 1684 | percept_flt_tbl[1][k] + |
| 1685 | (1 << 14)) >> 15; |
| 1686 | } |
| 1687 | iir_filter(flt_coef + 2 * l, flt_coef + 2 * l + LPC_ORDER, vector + i, |
| 1688 | buf + i, 0); |
| 1689 | l += LPC_ORDER; |
| 1690 | } |
| 1691 | memcpy(p->iir_mem, buf + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); |
| 1692 | memcpy(p->fir_mem, vector + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); |
| 1693 | } |
| 1694 | |
| 1695 | /** |
| 1696 | * Estimate the open loop pitch period. |
| 1697 | * |
| 1698 | * @param buf perceptually weighted speech |
| 1699 | * @param start estimation is carried out from this position |
| 1700 | */ |
| 1701 | static int estimate_pitch(int16_t *buf, int start) |
| 1702 | { |
| 1703 | int max_exp = 32; |
| 1704 | int max_ccr = 0x4000; |
| 1705 | int max_eng = 0x7fff; |
| 1706 | int index = PITCH_MIN; |
| 1707 | int offset = start - PITCH_MIN + 1; |
| 1708 | |
| 1709 | int ccr, eng, orig_eng, ccr_eng, exp; |
| 1710 | int diff, temp; |
| 1711 | |
| 1712 | int i; |
| 1713 | |
| 1714 | orig_eng = ff_dot_product(buf + offset, buf + offset, HALF_FRAME_LEN); |
| 1715 | |
| 1716 | for (i = PITCH_MIN; i <= PITCH_MAX - 3; i++) { |
| 1717 | offset--; |
| 1718 | |
| 1719 | /* Update energy and compute correlation */ |
| 1720 | orig_eng += buf[offset] * buf[offset] - |
| 1721 | buf[offset + HALF_FRAME_LEN] * buf[offset + HALF_FRAME_LEN]; |
| 1722 | ccr = ff_dot_product(buf + start, buf + offset, HALF_FRAME_LEN); |
| 1723 | if (ccr <= 0) |
| 1724 | continue; |
| 1725 | |
| 1726 | /* Split into mantissa and exponent to maintain precision */ |
| 1727 | exp = normalize_bits_int32(ccr); |
| 1728 | ccr = av_clipl_int32((int64_t)(ccr << exp) + (1 << 15)) >> 16; |
| 1729 | exp <<= 1; |
| 1730 | ccr *= ccr; |
| 1731 | temp = normalize_bits_int32(ccr); |
| 1732 | ccr = ccr << temp >> 16; |
| 1733 | exp += temp; |
| 1734 | |
| 1735 | temp = normalize_bits_int32(orig_eng); |
| 1736 | eng = av_clipl_int32((int64_t)(orig_eng << temp) + (1 << 15)) >> 16; |
| 1737 | exp -= temp; |
| 1738 | |
| 1739 | if (ccr >= eng) { |
| 1740 | exp--; |
| 1741 | ccr >>= 1; |
| 1742 | } |
| 1743 | if (exp > max_exp) |
| 1744 | continue; |
| 1745 | |
| 1746 | if (exp + 1 < max_exp) |
| 1747 | goto update; |
| 1748 | |
| 1749 | /* Equalize exponents before comparison */ |
| 1750 | if (exp + 1 == max_exp) |
| 1751 | temp = max_ccr >> 1; |
| 1752 | else |
| 1753 | temp = max_ccr; |
| 1754 | ccr_eng = ccr * max_eng; |
| 1755 | diff = ccr_eng - eng * temp; |
| 1756 | if (diff > 0 && (i - index < PITCH_MIN || diff > ccr_eng >> 2)) { |
| 1757 | update: |
| 1758 | index = i; |
| 1759 | max_exp = exp; |
| 1760 | max_ccr = ccr; |
| 1761 | max_eng = eng; |
| 1762 | } |
| 1763 | } |
| 1764 | return index; |
| 1765 | } |
| 1766 | |
| 1767 | /** |
| 1768 | * Compute harmonic noise filter parameters. |
| 1769 | * |
| 1770 | * @param buf perceptually weighted speech |
| 1771 | * @param pitch_lag open loop pitch period |
| 1772 | * @param hf harmonic filter parameters |
| 1773 | */ |
| 1774 | static void comp_harmonic_coeff(int16_t *buf, int16_t pitch_lag, HFParam *hf) |
| 1775 | { |
| 1776 | int ccr, eng, max_ccr, max_eng; |
| 1777 | int exp, max, diff; |
| 1778 | int energy[15]; |
| 1779 | int i, j; |
| 1780 | |
| 1781 | for (i = 0, j = pitch_lag - 3; j <= pitch_lag + 3; i++, j++) { |
| 1782 | /* Compute residual energy */ |
| 1783 | energy[i << 1] = ff_dot_product(buf - j, buf - j, SUBFRAME_LEN); |
| 1784 | /* Compute correlation */ |
| 1785 | energy[(i << 1) + 1] = ff_dot_product(buf, buf - j, SUBFRAME_LEN); |
| 1786 | } |
| 1787 | |
| 1788 | /* Compute target energy */ |
| 1789 | energy[14] = ff_dot_product(buf, buf, SUBFRAME_LEN); |
| 1790 | |
| 1791 | /* Normalize */ |
| 1792 | max = 0; |
| 1793 | for (i = 0; i < 15; i++) |
| 1794 | max = FFMAX(max, FFABS(energy[i])); |
| 1795 | |
| 1796 | exp = normalize_bits_int32(max); |
| 1797 | for (i = 0; i < 15; i++) { |
| 1798 | energy[i] = av_clipl_int32((int64_t)(energy[i] << exp) + |
| 1799 | (1 << 15)) >> 16; |
| 1800 | } |
| 1801 | |
| 1802 | hf->index = -1; |
| 1803 | hf->gain = 0; |
| 1804 | max_ccr = 1; |
| 1805 | max_eng = 0x7fff; |
| 1806 | |
| 1807 | for (i = 0; i <= 6; i++) { |
| 1808 | eng = energy[i << 1]; |
| 1809 | ccr = energy[(i << 1) + 1]; |
| 1810 | |
| 1811 | if (ccr <= 0) |
| 1812 | continue; |
| 1813 | |
| 1814 | ccr = (ccr * ccr + (1 << 14)) >> 15; |
| 1815 | diff = ccr * max_eng - eng * max_ccr; |
| 1816 | if (diff > 0) { |
| 1817 | max_ccr = ccr; |
| 1818 | max_eng = eng; |
| 1819 | hf->index = i; |
| 1820 | } |
| 1821 | } |
| 1822 | |
| 1823 | if (hf->index == -1) { |
| 1824 | hf->index = pitch_lag; |
| 1825 | return; |
| 1826 | } |
| 1827 | |
| 1828 | eng = energy[14] * max_eng; |
| 1829 | eng = (eng >> 2) + (eng >> 3); |
| 1830 | ccr = energy[(hf->index << 1) + 1] * energy[(hf->index << 1) + 1]; |
| 1831 | if (eng < ccr) { |
| 1832 | eng = energy[(hf->index << 1) + 1]; |
| 1833 | |
| 1834 | if (eng >= max_eng) |
| 1835 | hf->gain = 0x2800; |
| 1836 | else |
| 1837 | hf->gain = ((eng << 15) / max_eng * 0x2800 + (1 << 14)) >> 15; |
| 1838 | } |
| 1839 | hf->index += pitch_lag - 3; |
| 1840 | } |
| 1841 | |
| 1842 | /** |
| 1843 | * Apply the harmonic noise shaping filter. |
| 1844 | * |
| 1845 | * @param hf filter parameters |
| 1846 | */ |
| 1847 | static void harmonic_filter(HFParam *hf, const int16_t *src, int16_t *dest) |
| 1848 | { |
| 1849 | int i; |
| 1850 | |
| 1851 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 1852 | int64_t temp = hf->gain * src[i - hf->index] << 1; |
| 1853 | dest[i] = av_clipl_int32((src[i] << 16) - temp + (1 << 15)) >> 16; |
| 1854 | } |
| 1855 | } |
| 1856 | |
| 1857 | static void harmonic_noise_sub(HFParam *hf, const int16_t *src, int16_t *dest) |
| 1858 | { |
| 1859 | int i; |
| 1860 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 1861 | int64_t temp = hf->gain * src[i - hf->index] << 1; |
| 1862 | dest[i] = av_clipl_int32(((dest[i] - src[i]) << 16) + temp + |
| 1863 | (1 << 15)) >> 16; |
| 1864 | |
| 1865 | } |
| 1866 | } |
| 1867 | |
| 1868 | /** |
| 1869 | * Combined synthesis and formant perceptual weighting filer. |
| 1870 | * |
| 1871 | * @param qnt_lpc quantized lpc coefficients |
| 1872 | * @param perf_lpc perceptual filter coefficients |
| 1873 | * @param perf_fir perceptual filter fir memory |
| 1874 | * @param perf_iir perceptual filter iir memory |
| 1875 | * @param scale the filter output will be scaled by 2^scale |
| 1876 | */ |
| 1877 | static void synth_percept_filter(int16_t *qnt_lpc, int16_t *perf_lpc, |
| 1878 | int16_t *perf_fir, int16_t *perf_iir, |
| 1879 | const int16_t *src, int16_t *dest, int scale) |
| 1880 | { |
| 1881 | int i, j; |
| 1882 | int16_t buf_16[SUBFRAME_LEN + LPC_ORDER]; |
| 1883 | int64_t buf[SUBFRAME_LEN]; |
| 1884 | |
| 1885 | int16_t *bptr_16 = buf_16 + LPC_ORDER; |
| 1886 | |
| 1887 | memcpy(buf_16, perf_fir, sizeof(int16_t) * LPC_ORDER); |
| 1888 | memcpy(dest - LPC_ORDER, perf_iir, sizeof(int16_t) * LPC_ORDER); |
| 1889 | |
| 1890 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 1891 | int64_t temp = 0; |
| 1892 | for (j = 1; j <= LPC_ORDER; j++) |
| 1893 | temp -= qnt_lpc[j - 1] * bptr_16[i - j]; |
| 1894 | |
| 1895 | buf[i] = (src[i] << 15) + (temp << 3); |
| 1896 | bptr_16[i] = av_clipl_int32(buf[i] + (1 << 15)) >> 16; |
| 1897 | } |
| 1898 | |
| 1899 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 1900 | int64_t fir = 0, iir = 0; |
| 1901 | for (j = 1; j <= LPC_ORDER; j++) { |
| 1902 | fir -= perf_lpc[j - 1] * bptr_16[i - j]; |
| 1903 | iir += perf_lpc[j + LPC_ORDER - 1] * dest[i - j]; |
| 1904 | } |
| 1905 | dest[i] = av_clipl_int32(((buf[i] + (fir << 3)) << scale) + (iir << 3) + |
| 1906 | (1 << 15)) >> 16; |
| 1907 | } |
| 1908 | memcpy(perf_fir, buf_16 + SUBFRAME_LEN, sizeof(int16_t) * LPC_ORDER); |
| 1909 | memcpy(perf_iir, dest + SUBFRAME_LEN - LPC_ORDER, |
| 1910 | sizeof(int16_t) * LPC_ORDER); |
| 1911 | } |
| 1912 | |
| 1913 | /** |
| 1914 | * Compute the adaptive codebook contribution. |
| 1915 | * |
| 1916 | * @param buf input signal |
| 1917 | * @param index the current subframe index |
| 1918 | */ |
| 1919 | static void acb_search(G723_1_Context *p, int16_t *residual, |
| 1920 | int16_t *impulse_resp, const int16_t *buf, |
| 1921 | int index) |
| 1922 | { |
| 1923 | |
| 1924 | int16_t flt_buf[PITCH_ORDER][SUBFRAME_LEN]; |
| 1925 | |
| 1926 | const int16_t *cb_tbl = adaptive_cb_gain85; |
| 1927 | |
| 1928 | int ccr_buf[PITCH_ORDER * SUBFRAMES << 2]; |
| 1929 | |
| 1930 | int pitch_lag = p->pitch_lag[index >> 1]; |
| 1931 | int acb_lag = 1; |
| 1932 | int acb_gain = 0; |
| 1933 | int odd_frame = index & 1; |
| 1934 | int iter = 3 + odd_frame; |
| 1935 | int count = 0; |
| 1936 | int tbl_size = 85; |
| 1937 | |
| 1938 | int i, j, k, l, max; |
| 1939 | int64_t temp; |
| 1940 | |
| 1941 | if (!odd_frame) { |
| 1942 | if (pitch_lag == PITCH_MIN) |
| 1943 | pitch_lag++; |
| 1944 | else |
| 1945 | pitch_lag = FFMIN(pitch_lag, PITCH_MAX - 5); |
| 1946 | } |
| 1947 | |
| 1948 | for (i = 0; i < iter; i++) { |
| 1949 | get_residual(residual, p->prev_excitation, pitch_lag + i - 1); |
| 1950 | |
| 1951 | for (j = 0; j < SUBFRAME_LEN; j++) { |
| 1952 | temp = 0; |
| 1953 | for (k = 0; k <= j; k++) |
| 1954 | temp += residual[PITCH_ORDER - 1 + k] * impulse_resp[j - k]; |
| 1955 | flt_buf[PITCH_ORDER - 1][j] = av_clipl_int32((temp << 1) + |
| 1956 | (1 << 15)) >> 16; |
| 1957 | } |
| 1958 | |
| 1959 | for (j = PITCH_ORDER - 2; j >= 0; j--) { |
| 1960 | flt_buf[j][0] = ((residual[j] << 13) + (1 << 14)) >> 15; |
| 1961 | for (k = 1; k < SUBFRAME_LEN; k++) { |
| 1962 | temp = (flt_buf[j + 1][k - 1] << 15) + |
| 1963 | residual[j] * impulse_resp[k]; |
| 1964 | flt_buf[j][k] = av_clipl_int32((temp << 1) + (1 << 15)) >> 16; |
| 1965 | } |
| 1966 | } |
| 1967 | |
| 1968 | /* Compute crosscorrelation with the signal */ |
| 1969 | for (j = 0; j < PITCH_ORDER; j++) { |
| 1970 | temp = ff_dot_product(buf, flt_buf[j], SUBFRAME_LEN); |
| 1971 | ccr_buf[count++] = av_clipl_int32(temp << 1); |
| 1972 | } |
| 1973 | |
| 1974 | /* Compute energies */ |
| 1975 | for (j = 0; j < PITCH_ORDER; j++) { |
| 1976 | ccr_buf[count++] = dot_product(flt_buf[j], flt_buf[j], |
| 1977 | SUBFRAME_LEN); |
| 1978 | } |
| 1979 | |
| 1980 | for (j = 1; j < PITCH_ORDER; j++) { |
| 1981 | for (k = 0; k < j; k++) { |
| 1982 | temp = ff_dot_product(flt_buf[j], flt_buf[k], SUBFRAME_LEN); |
| 1983 | ccr_buf[count++] = av_clipl_int32(temp<<2); |
| 1984 | } |
| 1985 | } |
| 1986 | } |
| 1987 | |
| 1988 | /* Normalize and shorten */ |
| 1989 | max = 0; |
| 1990 | for (i = 0; i < 20 * iter; i++) |
| 1991 | max = FFMAX(max, FFABS(ccr_buf[i])); |
| 1992 | |
| 1993 | temp = normalize_bits_int32(max); |
| 1994 | |
| 1995 | for (i = 0; i < 20 * iter; i++){ |
| 1996 | ccr_buf[i] = av_clipl_int32((int64_t)(ccr_buf[i] << temp) + |
| 1997 | (1 << 15)) >> 16; |
| 1998 | } |
| 1999 | |
| 2000 | max = 0; |
| 2001 | for (i = 0; i < iter; i++) { |
| 2002 | /* Select quantization table */ |
| 2003 | if (!odd_frame && pitch_lag + i - 1 >= SUBFRAME_LEN - 2 || |
| 2004 | odd_frame && pitch_lag >= SUBFRAME_LEN - 2) { |
| 2005 | cb_tbl = adaptive_cb_gain170; |
| 2006 | tbl_size = 170; |
| 2007 | } |
| 2008 | |
| 2009 | for (j = 0, k = 0; j < tbl_size; j++, k += 20) { |
| 2010 | temp = 0; |
| 2011 | for (l = 0; l < 20; l++) |
| 2012 | temp += ccr_buf[20 * i + l] * cb_tbl[k + l]; |
| 2013 | temp = av_clipl_int32(temp); |
| 2014 | |
| 2015 | if (temp > max) { |
| 2016 | max = temp; |
| 2017 | acb_gain = j; |
| 2018 | acb_lag = i; |
| 2019 | } |
| 2020 | } |
| 2021 | } |
| 2022 | |
| 2023 | if (!odd_frame) { |
| 2024 | pitch_lag += acb_lag - 1; |
| 2025 | acb_lag = 1; |
| 2026 | } |
| 2027 | |
| 2028 | p->pitch_lag[index >> 1] = pitch_lag; |
| 2029 | p->subframe[index].ad_cb_lag = acb_lag; |
| 2030 | p->subframe[index].ad_cb_gain = acb_gain; |
| 2031 | } |
| 2032 | |
| 2033 | /** |
| 2034 | * Subtract the adaptive codebook contribution from the input |
| 2035 | * to obtain the residual. |
| 2036 | * |
| 2037 | * @param buf target vector |
| 2038 | */ |
| 2039 | static void sub_acb_contrib(const int16_t *residual, const int16_t *impulse_resp, |
| 2040 | int16_t *buf) |
| 2041 | { |
| 2042 | int i, j; |
| 2043 | /* Subtract adaptive CB contribution to obtain the residual */ |
| 2044 | for (i = 0; i < SUBFRAME_LEN; i++) { |
| 2045 | int64_t temp = buf[i] << 14; |
| 2046 | for (j = 0; j <= i; j++) |
| 2047 | temp -= residual[j] * impulse_resp[i - j]; |
| 2048 | |
| 2049 | buf[i] = av_clipl_int32((temp << 2) + (1 << 15)) >> 16; |
| 2050 | } |
| 2051 | } |
| 2052 | |
| 2053 | /** |
| 2054 | * Quantize the residual signal using the fixed codebook (MP-MLQ). |
| 2055 | * |
| 2056 | * @param optim optimized fixed codebook parameters |
| 2057 | * @param buf excitation vector |
| 2058 | */ |
| 2059 | static void get_fcb_param(FCBParam *optim, int16_t *impulse_resp, |
| 2060 | int16_t *buf, int pulse_cnt, int pitch_lag) |
| 2061 | { |
| 2062 | FCBParam param; |
| 2063 | int16_t impulse_r[SUBFRAME_LEN]; |
| 2064 | int16_t temp_corr[SUBFRAME_LEN]; |
| 2065 | int16_t impulse_corr[SUBFRAME_LEN]; |
| 2066 | |
| 2067 | int ccr1[SUBFRAME_LEN]; |
| 2068 | int ccr2[SUBFRAME_LEN]; |
| 2069 | int amp, err, max, max_amp_index, min, scale, i, j, k, l; |
| 2070 | |
| 2071 | int64_t temp; |
| 2072 | |
| 2073 | /* Update impulse response */ |
| 2074 | memcpy(impulse_r, impulse_resp, sizeof(int16_t) * SUBFRAME_LEN); |
| 2075 | param.dirac_train = 0; |
| 2076 | if (pitch_lag < SUBFRAME_LEN - 2) { |
| 2077 | param.dirac_train = 1; |
| 2078 | gen_dirac_train(impulse_r, pitch_lag); |
| 2079 | } |
| 2080 | |
| 2081 | for (i = 0; i < SUBFRAME_LEN; i++) |
| 2082 | temp_corr[i] = impulse_r[i] >> 1; |
| 2083 | |
| 2084 | /* Compute impulse response autocorrelation */ |
| 2085 | temp = dot_product(temp_corr, temp_corr, SUBFRAME_LEN); |
| 2086 | |
| 2087 | scale = normalize_bits_int32(temp); |
| 2088 | impulse_corr[0] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; |
| 2089 | |
| 2090 | for (i = 1; i < SUBFRAME_LEN; i++) { |
| 2091 | temp = dot_product(temp_corr + i, temp_corr, SUBFRAME_LEN - i); |
| 2092 | impulse_corr[i] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; |
| 2093 | } |
| 2094 | |
| 2095 | /* Compute crosscorrelation of impulse response with residual signal */ |
| 2096 | scale -= 4; |
| 2097 | for (i = 0; i < SUBFRAME_LEN; i++){ |
| 2098 | temp = dot_product(buf + i, impulse_r, SUBFRAME_LEN - i); |
| 2099 | if (scale < 0) |
| 2100 | ccr1[i] = temp >> -scale; |
| 2101 | else |
| 2102 | ccr1[i] = av_clipl_int32(temp << scale); |
| 2103 | } |
| 2104 | |
| 2105 | /* Search loop */ |
| 2106 | for (i = 0; i < GRID_SIZE; i++) { |
| 2107 | /* Maximize the crosscorrelation */ |
| 2108 | max = 0; |
| 2109 | for (j = i; j < SUBFRAME_LEN; j += GRID_SIZE) { |
| 2110 | temp = FFABS(ccr1[j]); |
| 2111 | if (temp >= max) { |
| 2112 | max = temp; |
| 2113 | param.pulse_pos[0] = j; |
| 2114 | } |
| 2115 | } |
| 2116 | |
| 2117 | /* Quantize the gain (max crosscorrelation/impulse_corr[0]) */ |
| 2118 | amp = max; |
| 2119 | min = 1 << 30; |
| 2120 | max_amp_index = GAIN_LEVELS - 2; |
| 2121 | for (j = max_amp_index; j >= 2; j--) { |
| 2122 | temp = av_clipl_int32((int64_t)fixed_cb_gain[j] * |
| 2123 | impulse_corr[0] << 1); |
| 2124 | temp = FFABS(temp - amp); |
| 2125 | if (temp < min) { |
| 2126 | min = temp; |
| 2127 | max_amp_index = j; |
| 2128 | } |
| 2129 | } |
| 2130 | |
| 2131 | max_amp_index--; |
| 2132 | /* Select additional gain values */ |
| 2133 | for (j = 1; j < 5; j++) { |
| 2134 | for (k = i; k < SUBFRAME_LEN; k += GRID_SIZE) { |
| 2135 | temp_corr[k] = 0; |
| 2136 | ccr2[k] = ccr1[k]; |
| 2137 | } |
| 2138 | param.amp_index = max_amp_index + j - 2; |
| 2139 | amp = fixed_cb_gain[param.amp_index]; |
| 2140 | |
| 2141 | param.pulse_sign[0] = (ccr2[param.pulse_pos[0]] < 0) ? -amp : amp; |
| 2142 | temp_corr[param.pulse_pos[0]] = 1; |
| 2143 | |
| 2144 | for (k = 1; k < pulse_cnt; k++) { |
| 2145 | max = -1 << 30; |
| 2146 | for (l = i; l < SUBFRAME_LEN; l += GRID_SIZE) { |
| 2147 | if (temp_corr[l]) |
| 2148 | continue; |
| 2149 | temp = impulse_corr[FFABS(l - param.pulse_pos[k - 1])]; |
| 2150 | temp = av_clipl_int32((int64_t)temp * |
| 2151 | param.pulse_sign[k - 1] << 1); |
| 2152 | ccr2[l] -= temp; |
| 2153 | temp = FFABS(ccr2[l]); |
| 2154 | if (temp > max) { |
| 2155 | max = temp; |
| 2156 | param.pulse_pos[k] = l; |
| 2157 | } |
| 2158 | } |
| 2159 | |
| 2160 | param.pulse_sign[k] = (ccr2[param.pulse_pos[k]] < 0) ? |
| 2161 | -amp : amp; |
| 2162 | temp_corr[param.pulse_pos[k]] = 1; |
| 2163 | } |
| 2164 | |
| 2165 | /* Create the error vector */ |
| 2166 | memset(temp_corr, 0, sizeof(int16_t) * SUBFRAME_LEN); |
| 2167 | |
| 2168 | for (k = 0; k < pulse_cnt; k++) |
| 2169 | temp_corr[param.pulse_pos[k]] = param.pulse_sign[k]; |
| 2170 | |
| 2171 | for (k = SUBFRAME_LEN - 1; k >= 0; k--) { |
| 2172 | temp = 0; |
| 2173 | for (l = 0; l <= k; l++) { |
| 2174 | int prod = av_clipl_int32((int64_t)temp_corr[l] * |
| 2175 | impulse_r[k - l] << 1); |
| 2176 | temp = av_clipl_int32(temp + prod); |
| 2177 | } |
| 2178 | temp_corr[k] = temp << 2 >> 16; |
| 2179 | } |
| 2180 | |
| 2181 | /* Compute square of error */ |
| 2182 | err = 0; |
| 2183 | for (k = 0; k < SUBFRAME_LEN; k++) { |
| 2184 | int64_t prod; |
| 2185 | prod = av_clipl_int32((int64_t)buf[k] * temp_corr[k] << 1); |
| 2186 | err = av_clipl_int32(err - prod); |
| 2187 | prod = av_clipl_int32((int64_t)temp_corr[k] * temp_corr[k]); |
| 2188 | err = av_clipl_int32(err + prod); |
| 2189 | } |
| 2190 | |
| 2191 | /* Minimize */ |
| 2192 | if (err < optim->min_err) { |
| 2193 | optim->min_err = err; |
| 2194 | optim->grid_index = i; |
| 2195 | optim->amp_index = param.amp_index; |
| 2196 | optim->dirac_train = param.dirac_train; |
| 2197 | |
| 2198 | for (k = 0; k < pulse_cnt; k++) { |
| 2199 | optim->pulse_sign[k] = param.pulse_sign[k]; |
| 2200 | optim->pulse_pos[k] = param.pulse_pos[k]; |
| 2201 | } |
| 2202 | } |
| 2203 | } |
| 2204 | } |
| 2205 | } |
| 2206 | |
| 2207 | /** |
| 2208 | * Encode the pulse position and gain of the current subframe. |
| 2209 | * |
| 2210 | * @param optim optimized fixed CB parameters |
| 2211 | * @param buf excitation vector |
| 2212 | */ |
| 2213 | static void pack_fcb_param(G723_1_Subframe *subfrm, FCBParam *optim, |
| 2214 | int16_t *buf, int pulse_cnt) |
| 2215 | { |
| 2216 | int i, j; |
| 2217 | |
| 2218 | j = PULSE_MAX - pulse_cnt; |
| 2219 | |
| 2220 | subfrm->pulse_sign = 0; |
| 2221 | subfrm->pulse_pos = 0; |
| 2222 | |
| 2223 | for (i = 0; i < SUBFRAME_LEN >> 1; i++) { |
| 2224 | int val = buf[optim->grid_index + (i << 1)]; |
| 2225 | if (!val) { |
| 2226 | subfrm->pulse_pos += combinatorial_table[j][i]; |
| 2227 | } else { |
| 2228 | subfrm->pulse_sign <<= 1; |
| 2229 | if (val < 0) subfrm->pulse_sign++; |
| 2230 | j++; |
| 2231 | |
| 2232 | if (j == PULSE_MAX) break; |
| 2233 | } |
| 2234 | } |
| 2235 | subfrm->amp_index = optim->amp_index; |
| 2236 | subfrm->grid_index = optim->grid_index; |
| 2237 | subfrm->dirac_train = optim->dirac_train; |
| 2238 | } |
| 2239 | |
| 2240 | /** |
| 2241 | * Compute the fixed codebook excitation. |
| 2242 | * |
| 2243 | * @param buf target vector |
| 2244 | * @param impulse_resp impulse response of the combined filter |
| 2245 | */ |
| 2246 | static void fcb_search(G723_1_Context *p, int16_t *impulse_resp, |
| 2247 | int16_t *buf, int index) |
| 2248 | { |
| 2249 | FCBParam optim; |
| 2250 | int pulse_cnt = pulses[index]; |
| 2251 | int i; |
| 2252 | |
| 2253 | optim.min_err = 1 << 30; |
| 2254 | get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, SUBFRAME_LEN); |
| 2255 | |
| 2256 | if (p->pitch_lag[index >> 1] < SUBFRAME_LEN - 2) { |
| 2257 | get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, |
| 2258 | p->pitch_lag[index >> 1]); |
| 2259 | } |
| 2260 | |
| 2261 | /* Reconstruct the excitation */ |
| 2262 | memset(buf, 0, sizeof(int16_t) * SUBFRAME_LEN); |
| 2263 | for (i = 0; i < pulse_cnt; i++) |
| 2264 | buf[optim.pulse_pos[i]] = optim.pulse_sign[i]; |
| 2265 | |
| 2266 | pack_fcb_param(&p->subframe[index], &optim, buf, pulse_cnt); |
| 2267 | |
| 2268 | if (optim.dirac_train) |
| 2269 | gen_dirac_train(buf, p->pitch_lag[index >> 1]); |
| 2270 | } |
| 2271 | |
| 2272 | /** |
| 2273 | * Pack the frame parameters into output bitstream. |
| 2274 | * |
| 2275 | * @param frame output buffer |
| 2276 | * @param size size of the buffer |
| 2277 | */ |
| 2278 | static int pack_bitstream(G723_1_Context *p, unsigned char *frame, int size) |
| 2279 | { |
| 2280 | PutBitContext pb; |
| 2281 | int info_bits, i, temp; |
| 2282 | |
| 2283 | init_put_bits(&pb, frame, size); |
| 2284 | |
| 2285 | if (p->cur_rate == RATE_6300) { |
| 2286 | info_bits = 0; |
| 2287 | put_bits(&pb, 2, info_bits); |
| 2288 | }else |
| 2289 | av_assert0(0); |
| 2290 | |
| 2291 | put_bits(&pb, 8, p->lsp_index[2]); |
| 2292 | put_bits(&pb, 8, p->lsp_index[1]); |
| 2293 | put_bits(&pb, 8, p->lsp_index[0]); |
| 2294 | |
| 2295 | put_bits(&pb, 7, p->pitch_lag[0] - PITCH_MIN); |
| 2296 | put_bits(&pb, 2, p->subframe[1].ad_cb_lag); |
| 2297 | put_bits(&pb, 7, p->pitch_lag[1] - PITCH_MIN); |
| 2298 | put_bits(&pb, 2, p->subframe[3].ad_cb_lag); |
| 2299 | |
| 2300 | /* Write 12 bit combined gain */ |
| 2301 | for (i = 0; i < SUBFRAMES; i++) { |
| 2302 | temp = p->subframe[i].ad_cb_gain * GAIN_LEVELS + |
| 2303 | p->subframe[i].amp_index; |
| 2304 | if (p->cur_rate == RATE_6300) |
| 2305 | temp += p->subframe[i].dirac_train << 11; |
| 2306 | put_bits(&pb, 12, temp); |
| 2307 | } |
| 2308 | |
| 2309 | put_bits(&pb, 1, p->subframe[0].grid_index); |
| 2310 | put_bits(&pb, 1, p->subframe[1].grid_index); |
| 2311 | put_bits(&pb, 1, p->subframe[2].grid_index); |
| 2312 | put_bits(&pb, 1, p->subframe[3].grid_index); |
| 2313 | |
| 2314 | if (p->cur_rate == RATE_6300) { |
| 2315 | skip_put_bits(&pb, 1); /* reserved bit */ |
| 2316 | |
| 2317 | /* Write 13 bit combined position index */ |
| 2318 | temp = (p->subframe[0].pulse_pos >> 16) * 810 + |
| 2319 | (p->subframe[1].pulse_pos >> 14) * 90 + |
| 2320 | (p->subframe[2].pulse_pos >> 16) * 9 + |
| 2321 | (p->subframe[3].pulse_pos >> 14); |
| 2322 | put_bits(&pb, 13, temp); |
| 2323 | |
| 2324 | put_bits(&pb, 16, p->subframe[0].pulse_pos & 0xffff); |
| 2325 | put_bits(&pb, 14, p->subframe[1].pulse_pos & 0x3fff); |
| 2326 | put_bits(&pb, 16, p->subframe[2].pulse_pos & 0xffff); |
| 2327 | put_bits(&pb, 14, p->subframe[3].pulse_pos & 0x3fff); |
| 2328 | |
| 2329 | put_bits(&pb, 6, p->subframe[0].pulse_sign); |
| 2330 | put_bits(&pb, 5, p->subframe[1].pulse_sign); |
| 2331 | put_bits(&pb, 6, p->subframe[2].pulse_sign); |
| 2332 | put_bits(&pb, 5, p->subframe[3].pulse_sign); |
| 2333 | } |
| 2334 | |
| 2335 | flush_put_bits(&pb); |
| 2336 | return frame_size[info_bits]; |
| 2337 | } |
| 2338 | |
| 2339 | static int g723_1_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
| 2340 | const AVFrame *frame, int *got_packet_ptr) |
| 2341 | { |
| 2342 | G723_1_Context *p = avctx->priv_data; |
| 2343 | int16_t unq_lpc[LPC_ORDER * SUBFRAMES]; |
| 2344 | int16_t qnt_lpc[LPC_ORDER * SUBFRAMES]; |
| 2345 | int16_t cur_lsp[LPC_ORDER]; |
| 2346 | int16_t weighted_lpc[LPC_ORDER * SUBFRAMES << 1]; |
| 2347 | int16_t vector[FRAME_LEN + PITCH_MAX]; |
| 2348 | int offset, ret; |
| 2349 | int16_t *in_orig = av_memdup(frame->data[0], frame->nb_samples * sizeof(int16_t)); |
| 2350 | int16_t *in = in_orig; |
| 2351 | |
| 2352 | HFParam hf[4]; |
| 2353 | int i, j; |
| 2354 | |
| 2355 | if (!in) |
| 2356 | return AVERROR(ENOMEM); |
| 2357 | |
| 2358 | highpass_filter(in, &p->hpf_fir_mem, &p->hpf_iir_mem); |
| 2359 | |
| 2360 | memcpy(vector, p->prev_data, HALF_FRAME_LEN * sizeof(int16_t)); |
| 2361 | memcpy(vector + HALF_FRAME_LEN, in, FRAME_LEN * sizeof(int16_t)); |
| 2362 | |
| 2363 | comp_lpc_coeff(vector, unq_lpc); |
| 2364 | lpc2lsp(&unq_lpc[LPC_ORDER * 3], p->prev_lsp, cur_lsp); |
| 2365 | lsp_quantize(p->lsp_index, cur_lsp, p->prev_lsp); |
| 2366 | |
| 2367 | /* Update memory */ |
| 2368 | memcpy(vector + LPC_ORDER, p->prev_data + SUBFRAME_LEN, |
| 2369 | sizeof(int16_t) * SUBFRAME_LEN); |
| 2370 | memcpy(vector + LPC_ORDER + SUBFRAME_LEN, in, |
| 2371 | sizeof(int16_t) * (HALF_FRAME_LEN + SUBFRAME_LEN)); |
| 2372 | memcpy(p->prev_data, in + HALF_FRAME_LEN, |
| 2373 | sizeof(int16_t) * HALF_FRAME_LEN); |
| 2374 | memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); |
| 2375 | |
| 2376 | perceptual_filter(p, weighted_lpc, unq_lpc, vector); |
| 2377 | |
| 2378 | memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); |
| 2379 | memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); |
| 2380 | memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); |
| 2381 | |
| 2382 | scale_vector(vector, vector, FRAME_LEN + PITCH_MAX); |
| 2383 | |
| 2384 | p->pitch_lag[0] = estimate_pitch(vector, PITCH_MAX); |
| 2385 | p->pitch_lag[1] = estimate_pitch(vector, PITCH_MAX + HALF_FRAME_LEN); |
| 2386 | |
| 2387 | for (i = PITCH_MAX, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) |
| 2388 | comp_harmonic_coeff(vector + i, p->pitch_lag[j >> 1], hf + j); |
| 2389 | |
| 2390 | memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); |
| 2391 | memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); |
| 2392 | memcpy(p->prev_weight_sig, vector + FRAME_LEN, sizeof(int16_t) * PITCH_MAX); |
| 2393 | |
| 2394 | for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) |
| 2395 | harmonic_filter(hf + j, vector + PITCH_MAX + i, in + i); |
| 2396 | |
| 2397 | inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, 0); |
| 2398 | lsp_interpolate(qnt_lpc, cur_lsp, p->prev_lsp); |
| 2399 | |
| 2400 | memcpy(p->prev_lsp, cur_lsp, sizeof(int16_t) * LPC_ORDER); |
| 2401 | |
| 2402 | offset = 0; |
| 2403 | for (i = 0; i < SUBFRAMES; i++) { |
| 2404 | int16_t impulse_resp[SUBFRAME_LEN]; |
| 2405 | int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; |
| 2406 | int16_t flt_in[SUBFRAME_LEN]; |
| 2407 | int16_t zero[LPC_ORDER], fir[LPC_ORDER], iir[LPC_ORDER]; |
| 2408 | |
| 2409 | /** |
| 2410 | * Compute the combined impulse response of the synthesis filter, |
| 2411 | * formant perceptual weighting filter and harmonic noise shaping filter |
| 2412 | */ |
| 2413 | memset(zero, 0, sizeof(int16_t) * LPC_ORDER); |
| 2414 | memset(vector, 0, sizeof(int16_t) * PITCH_MAX); |
| 2415 | memset(flt_in, 0, sizeof(int16_t) * SUBFRAME_LEN); |
| 2416 | |
| 2417 | flt_in[0] = 1 << 13; /* Unit impulse */ |
| 2418 | synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), |
| 2419 | zero, zero, flt_in, vector + PITCH_MAX, 1); |
| 2420 | harmonic_filter(hf + i, vector + PITCH_MAX, impulse_resp); |
| 2421 | |
| 2422 | /* Compute the combined zero input response */ |
| 2423 | flt_in[0] = 0; |
| 2424 | memcpy(fir, p->perf_fir_mem, sizeof(int16_t) * LPC_ORDER); |
| 2425 | memcpy(iir, p->perf_iir_mem, sizeof(int16_t) * LPC_ORDER); |
| 2426 | |
| 2427 | synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), |
| 2428 | fir, iir, flt_in, vector + PITCH_MAX, 0); |
| 2429 | memcpy(vector, p->harmonic_mem, sizeof(int16_t) * PITCH_MAX); |
| 2430 | harmonic_noise_sub(hf + i, vector + PITCH_MAX, in); |
| 2431 | |
| 2432 | acb_search(p, residual, impulse_resp, in, i); |
| 2433 | gen_acb_excitation(residual, p->prev_excitation,p->pitch_lag[i >> 1], |
| 2434 | &p->subframe[i], p->cur_rate); |
| 2435 | sub_acb_contrib(residual, impulse_resp, in); |
| 2436 | |
| 2437 | fcb_search(p, impulse_resp, in, i); |
| 2438 | |
| 2439 | /* Reconstruct the excitation */ |
| 2440 | gen_acb_excitation(impulse_resp, p->prev_excitation, p->pitch_lag[i >> 1], |
| 2441 | &p->subframe[i], RATE_6300); |
| 2442 | |
| 2443 | memmove(p->prev_excitation, p->prev_excitation + SUBFRAME_LEN, |
| 2444 | sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); |
| 2445 | for (j = 0; j < SUBFRAME_LEN; j++) |
| 2446 | in[j] = av_clip_int16((in[j] << 1) + impulse_resp[j]); |
| 2447 | memcpy(p->prev_excitation + PITCH_MAX - SUBFRAME_LEN, in, |
| 2448 | sizeof(int16_t) * SUBFRAME_LEN); |
| 2449 | |
| 2450 | /* Update filter memories */ |
| 2451 | synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), |
| 2452 | p->perf_fir_mem, p->perf_iir_mem, |
| 2453 | in, vector + PITCH_MAX, 0); |
| 2454 | memmove(p->harmonic_mem, p->harmonic_mem + SUBFRAME_LEN, |
| 2455 | sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); |
| 2456 | memcpy(p->harmonic_mem + PITCH_MAX - SUBFRAME_LEN, vector + PITCH_MAX, |
| 2457 | sizeof(int16_t) * SUBFRAME_LEN); |
| 2458 | |
| 2459 | in += SUBFRAME_LEN; |
| 2460 | offset += LPC_ORDER; |
| 2461 | } |
| 2462 | |
| 2463 | av_freep(&in_orig); in = NULL; |
| 2464 | |
| 2465 | if ((ret = ff_alloc_packet2(avctx, avpkt, 24)) < 0) |
| 2466 | return ret; |
| 2467 | |
| 2468 | *got_packet_ptr = 1; |
| 2469 | avpkt->size = pack_bitstream(p, avpkt->data, avpkt->size); |
| 2470 | return 0; |
| 2471 | } |
| 2472 | |
| 2473 | AVCodec ff_g723_1_encoder = { |
| 2474 | .name = "g723_1", |
| 2475 | .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), |
| 2476 | .type = AVMEDIA_TYPE_AUDIO, |
| 2477 | .id = AV_CODEC_ID_G723_1, |
| 2478 | .priv_data_size = sizeof(G723_1_Context), |
| 2479 | .init = g723_1_encode_init, |
| 2480 | .encode2 = g723_1_encode_frame, |
| 2481 | .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16, |
| 2482 | AV_SAMPLE_FMT_NONE}, |
| 2483 | }; |
| 2484 | #endif |