| 1 | /* |
| 2 | * SIPR / ACELP.NET decoder |
| 3 | * |
| 4 | * Copyright (c) 2008 Vladimir Voroshilov |
| 5 | * Copyright (c) 2009 Vitor Sessak |
| 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 <math.h> |
| 25 | #include <stdint.h> |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include "libavutil/channel_layout.h" |
| 29 | #include "libavutil/float_dsp.h" |
| 30 | #include "libavutil/mathematics.h" |
| 31 | #include "avcodec.h" |
| 32 | #define BITSTREAM_READER_LE |
| 33 | #include "get_bits.h" |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #include "lsp.h" |
| 37 | #include "acelp_vectors.h" |
| 38 | #include "acelp_pitch_delay.h" |
| 39 | #include "acelp_filters.h" |
| 40 | #include "celp_filters.h" |
| 41 | |
| 42 | #define MAX_SUBFRAME_COUNT 5 |
| 43 | |
| 44 | #include "sipr.h" |
| 45 | #include "siprdata.h" |
| 46 | |
| 47 | typedef struct { |
| 48 | const char *mode_name; |
| 49 | uint16_t bits_per_frame; |
| 50 | uint8_t subframe_count; |
| 51 | uint8_t frames_per_packet; |
| 52 | float pitch_sharp_factor; |
| 53 | |
| 54 | /* bitstream parameters */ |
| 55 | uint8_t number_of_fc_indexes; |
| 56 | uint8_t ma_predictor_bits; ///< size in bits of the switched MA predictor |
| 57 | |
| 58 | /** size in bits of the i-th stage vector of quantizer */ |
| 59 | uint8_t vq_indexes_bits[5]; |
| 60 | |
| 61 | /** size in bits of the adaptive-codebook index for every subframe */ |
| 62 | uint8_t pitch_delay_bits[5]; |
| 63 | |
| 64 | uint8_t gp_index_bits; |
| 65 | uint8_t fc_index_bits[10]; ///< size in bits of the fixed codebook indexes |
| 66 | uint8_t gc_index_bits; ///< size in bits of the gain codebook indexes |
| 67 | } SiprModeParam; |
| 68 | |
| 69 | static const SiprModeParam modes[MODE_COUNT] = { |
| 70 | [MODE_16k] = { |
| 71 | .mode_name = "16k", |
| 72 | .bits_per_frame = 160, |
| 73 | .subframe_count = SUBFRAME_COUNT_16k, |
| 74 | .frames_per_packet = 1, |
| 75 | .pitch_sharp_factor = 0.00, |
| 76 | |
| 77 | .number_of_fc_indexes = 10, |
| 78 | .ma_predictor_bits = 1, |
| 79 | .vq_indexes_bits = {7, 8, 7, 7, 7}, |
| 80 | .pitch_delay_bits = {9, 6}, |
| 81 | .gp_index_bits = 4, |
| 82 | .fc_index_bits = {4, 5, 4, 5, 4, 5, 4, 5, 4, 5}, |
| 83 | .gc_index_bits = 5 |
| 84 | }, |
| 85 | |
| 86 | [MODE_8k5] = { |
| 87 | .mode_name = "8k5", |
| 88 | .bits_per_frame = 152, |
| 89 | .subframe_count = 3, |
| 90 | .frames_per_packet = 1, |
| 91 | .pitch_sharp_factor = 0.8, |
| 92 | |
| 93 | .number_of_fc_indexes = 3, |
| 94 | .ma_predictor_bits = 0, |
| 95 | .vq_indexes_bits = {6, 7, 7, 7, 5}, |
| 96 | .pitch_delay_bits = {8, 5, 5}, |
| 97 | .gp_index_bits = 0, |
| 98 | .fc_index_bits = {9, 9, 9}, |
| 99 | .gc_index_bits = 7 |
| 100 | }, |
| 101 | |
| 102 | [MODE_6k5] = { |
| 103 | .mode_name = "6k5", |
| 104 | .bits_per_frame = 232, |
| 105 | .subframe_count = 3, |
| 106 | .frames_per_packet = 2, |
| 107 | .pitch_sharp_factor = 0.8, |
| 108 | |
| 109 | .number_of_fc_indexes = 3, |
| 110 | .ma_predictor_bits = 0, |
| 111 | .vq_indexes_bits = {6, 7, 7, 7, 5}, |
| 112 | .pitch_delay_bits = {8, 5, 5}, |
| 113 | .gp_index_bits = 0, |
| 114 | .fc_index_bits = {5, 5, 5}, |
| 115 | .gc_index_bits = 7 |
| 116 | }, |
| 117 | |
| 118 | [MODE_5k0] = { |
| 119 | .mode_name = "5k0", |
| 120 | .bits_per_frame = 296, |
| 121 | .subframe_count = 5, |
| 122 | .frames_per_packet = 2, |
| 123 | .pitch_sharp_factor = 0.85, |
| 124 | |
| 125 | .number_of_fc_indexes = 1, |
| 126 | .ma_predictor_bits = 0, |
| 127 | .vq_indexes_bits = {6, 7, 7, 7, 5}, |
| 128 | .pitch_delay_bits = {8, 5, 8, 5, 5}, |
| 129 | .gp_index_bits = 0, |
| 130 | .fc_index_bits = {10}, |
| 131 | .gc_index_bits = 7 |
| 132 | } |
| 133 | }; |
| 134 | |
| 135 | const float ff_pow_0_5[] = { |
| 136 | 1.0/(1 << 1), 1.0/(1 << 2), 1.0/(1 << 3), 1.0/(1 << 4), |
| 137 | 1.0/(1 << 5), 1.0/(1 << 6), 1.0/(1 << 7), 1.0/(1 << 8), |
| 138 | 1.0/(1 << 9), 1.0/(1 << 10), 1.0/(1 << 11), 1.0/(1 << 12), |
| 139 | 1.0/(1 << 13), 1.0/(1 << 14), 1.0/(1 << 15), 1.0/(1 << 16) |
| 140 | }; |
| 141 | |
| 142 | static void dequant(float *out, const int *idx, const float * const cbs[]) |
| 143 | { |
| 144 | int i; |
| 145 | int stride = 2; |
| 146 | int num_vec = 5; |
| 147 | |
| 148 | for (i = 0; i < num_vec; i++) |
| 149 | memcpy(out + stride*i, cbs[i] + stride*idx[i], stride*sizeof(float)); |
| 150 | |
| 151 | } |
| 152 | |
| 153 | static void lsf_decode_fp(float *lsfnew, float *lsf_history, |
| 154 | const SiprParameters *parm) |
| 155 | { |
| 156 | int i; |
| 157 | float lsf_tmp[LP_FILTER_ORDER]; |
| 158 | |
| 159 | dequant(lsf_tmp, parm->vq_indexes, lsf_codebooks); |
| 160 | |
| 161 | for (i = 0; i < LP_FILTER_ORDER; i++) |
| 162 | lsfnew[i] = lsf_history[i] * 0.33 + lsf_tmp[i] + mean_lsf[i]; |
| 163 | |
| 164 | ff_sort_nearly_sorted_floats(lsfnew, LP_FILTER_ORDER - 1); |
| 165 | |
| 166 | /* Note that a minimum distance is not enforced between the last value and |
| 167 | the previous one, contrary to what is done in ff_acelp_reorder_lsf() */ |
| 168 | ff_set_min_dist_lsf(lsfnew, LSFQ_DIFF_MIN, LP_FILTER_ORDER - 1); |
| 169 | lsfnew[9] = FFMIN(lsfnew[LP_FILTER_ORDER - 1], 1.3 * M_PI); |
| 170 | |
| 171 | memcpy(lsf_history, lsf_tmp, LP_FILTER_ORDER * sizeof(*lsf_history)); |
| 172 | |
| 173 | for (i = 0; i < LP_FILTER_ORDER - 1; i++) |
| 174 | lsfnew[i] = cos(lsfnew[i]); |
| 175 | lsfnew[LP_FILTER_ORDER - 1] *= 6.153848 / M_PI; |
| 176 | } |
| 177 | |
| 178 | /** Apply pitch lag to the fixed vector (AMR section 6.1.2). */ |
| 179 | static void pitch_sharpening(int pitch_lag_int, float beta, |
| 180 | float *fixed_vector) |
| 181 | { |
| 182 | int i; |
| 183 | |
| 184 | for (i = pitch_lag_int; i < SUBFR_SIZE; i++) |
| 185 | fixed_vector[i] += beta * fixed_vector[i - pitch_lag_int]; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Extract decoding parameters from the input bitstream. |
| 190 | * @param parms parameters structure |
| 191 | * @param pgb pointer to initialized GetBitContext structure |
| 192 | */ |
| 193 | static void decode_parameters(SiprParameters* parms, GetBitContext *pgb, |
| 194 | const SiprModeParam *p) |
| 195 | { |
| 196 | int i, j; |
| 197 | |
| 198 | if (p->ma_predictor_bits) |
| 199 | parms->ma_pred_switch = get_bits(pgb, p->ma_predictor_bits); |
| 200 | |
| 201 | for (i = 0; i < 5; i++) |
| 202 | parms->vq_indexes[i] = get_bits(pgb, p->vq_indexes_bits[i]); |
| 203 | |
| 204 | for (i = 0; i < p->subframe_count; i++) { |
| 205 | parms->pitch_delay[i] = get_bits(pgb, p->pitch_delay_bits[i]); |
| 206 | if (p->gp_index_bits) |
| 207 | parms->gp_index[i] = get_bits(pgb, p->gp_index_bits); |
| 208 | |
| 209 | for (j = 0; j < p->number_of_fc_indexes; j++) |
| 210 | parms->fc_indexes[i][j] = get_bits(pgb, p->fc_index_bits[j]); |
| 211 | |
| 212 | parms->gc_index[i] = get_bits(pgb, p->gc_index_bits); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | static void sipr_decode_lp(float *lsfnew, const float *lsfold, float *Az, |
| 217 | int num_subfr) |
| 218 | { |
| 219 | double lsfint[LP_FILTER_ORDER]; |
| 220 | int i,j; |
| 221 | float t, t0 = 1.0 / num_subfr; |
| 222 | |
| 223 | t = t0 * 0.5; |
| 224 | for (i = 0; i < num_subfr; i++) { |
| 225 | for (j = 0; j < LP_FILTER_ORDER; j++) |
| 226 | lsfint[j] = lsfold[j] * (1 - t) + t * lsfnew[j]; |
| 227 | |
| 228 | ff_amrwb_lsp2lpc(lsfint, Az, LP_FILTER_ORDER); |
| 229 | Az += LP_FILTER_ORDER; |
| 230 | t += t0; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * Evaluate the adaptive impulse response. |
| 236 | */ |
| 237 | static void eval_ir(const float *Az, int pitch_lag, float *freq, |
| 238 | float pitch_sharp_factor) |
| 239 | { |
| 240 | float tmp1[SUBFR_SIZE+1], tmp2[LP_FILTER_ORDER+1]; |
| 241 | int i; |
| 242 | |
| 243 | tmp1[0] = 1.0; |
| 244 | for (i = 0; i < LP_FILTER_ORDER; i++) { |
| 245 | tmp1[i+1] = Az[i] * ff_pow_0_55[i]; |
| 246 | tmp2[i ] = Az[i] * ff_pow_0_7 [i]; |
| 247 | } |
| 248 | memset(tmp1 + 11, 0, 37 * sizeof(float)); |
| 249 | |
| 250 | ff_celp_lp_synthesis_filterf(freq, tmp2, tmp1, SUBFR_SIZE, |
| 251 | LP_FILTER_ORDER); |
| 252 | |
| 253 | pitch_sharpening(pitch_lag, pitch_sharp_factor, freq); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Evaluate the convolution of a vector with a sparse vector. |
| 258 | */ |
| 259 | static void convolute_with_sparse(float *out, const AMRFixed *pulses, |
| 260 | const float *shape, int length) |
| 261 | { |
| 262 | int i, j; |
| 263 | |
| 264 | memset(out, 0, length*sizeof(float)); |
| 265 | for (i = 0; i < pulses->n; i++) |
| 266 | for (j = pulses->x[i]; j < length; j++) |
| 267 | out[j] += pulses->y[i] * shape[j - pulses->x[i]]; |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * Apply postfilter, very similar to AMR one. |
| 272 | */ |
| 273 | static void postfilter_5k0(SiprContext *ctx, const float *lpc, float *samples) |
| 274 | { |
| 275 | float buf[SUBFR_SIZE + LP_FILTER_ORDER]; |
| 276 | float *pole_out = buf + LP_FILTER_ORDER; |
| 277 | float lpc_n[LP_FILTER_ORDER]; |
| 278 | float lpc_d[LP_FILTER_ORDER]; |
| 279 | int i; |
| 280 | |
| 281 | for (i = 0; i < LP_FILTER_ORDER; i++) { |
| 282 | lpc_d[i] = lpc[i] * ff_pow_0_75[i]; |
| 283 | lpc_n[i] = lpc[i] * ff_pow_0_5 [i]; |
| 284 | }; |
| 285 | |
| 286 | memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem, |
| 287 | LP_FILTER_ORDER*sizeof(float)); |
| 288 | |
| 289 | ff_celp_lp_synthesis_filterf(pole_out, lpc_d, samples, SUBFR_SIZE, |
| 290 | LP_FILTER_ORDER); |
| 291 | |
| 292 | memcpy(ctx->postfilter_mem, pole_out + SUBFR_SIZE - LP_FILTER_ORDER, |
| 293 | LP_FILTER_ORDER*sizeof(float)); |
| 294 | |
| 295 | ff_tilt_compensation(&ctx->tilt_mem, 0.4, pole_out, SUBFR_SIZE); |
| 296 | |
| 297 | memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem5k0, |
| 298 | LP_FILTER_ORDER*sizeof(*pole_out)); |
| 299 | |
| 300 | memcpy(ctx->postfilter_mem5k0, pole_out + SUBFR_SIZE - LP_FILTER_ORDER, |
| 301 | LP_FILTER_ORDER*sizeof(*pole_out)); |
| 302 | |
| 303 | ff_celp_lp_zero_synthesis_filterf(samples, lpc_n, pole_out, SUBFR_SIZE, |
| 304 | LP_FILTER_ORDER); |
| 305 | |
| 306 | } |
| 307 | |
| 308 | static void decode_fixed_sparse(AMRFixed *fixed_sparse, const int16_t *pulses, |
| 309 | SiprMode mode, int low_gain) |
| 310 | { |
| 311 | int i; |
| 312 | |
| 313 | switch (mode) { |
| 314 | case MODE_6k5: |
| 315 | for (i = 0; i < 3; i++) { |
| 316 | fixed_sparse->x[i] = 3 * (pulses[i] & 0xf) + i; |
| 317 | fixed_sparse->y[i] = pulses[i] & 0x10 ? -1 : 1; |
| 318 | } |
| 319 | fixed_sparse->n = 3; |
| 320 | break; |
| 321 | case MODE_8k5: |
| 322 | for (i = 0; i < 3; i++) { |
| 323 | fixed_sparse->x[2*i ] = 3 * ((pulses[i] >> 4) & 0xf) + i; |
| 324 | fixed_sparse->x[2*i + 1] = 3 * ( pulses[i] & 0xf) + i; |
| 325 | |
| 326 | fixed_sparse->y[2*i ] = (pulses[i] & 0x100) ? -1.0: 1.0; |
| 327 | |
| 328 | fixed_sparse->y[2*i + 1] = |
| 329 | (fixed_sparse->x[2*i + 1] < fixed_sparse->x[2*i]) ? |
| 330 | -fixed_sparse->y[2*i ] : fixed_sparse->y[2*i]; |
| 331 | } |
| 332 | |
| 333 | fixed_sparse->n = 6; |
| 334 | break; |
| 335 | case MODE_5k0: |
| 336 | default: |
| 337 | if (low_gain) { |
| 338 | int offset = (pulses[0] & 0x200) ? 2 : 0; |
| 339 | int val = pulses[0]; |
| 340 | |
| 341 | for (i = 0; i < 3; i++) { |
| 342 | int index = (val & 0x7) * 6 + 4 - i*2; |
| 343 | |
| 344 | fixed_sparse->y[i] = (offset + index) & 0x3 ? -1 : 1; |
| 345 | fixed_sparse->x[i] = index; |
| 346 | |
| 347 | val >>= 3; |
| 348 | } |
| 349 | fixed_sparse->n = 3; |
| 350 | } else { |
| 351 | int pulse_subset = (pulses[0] >> 8) & 1; |
| 352 | |
| 353 | fixed_sparse->x[0] = ((pulses[0] >> 4) & 15) * 3 + pulse_subset; |
| 354 | fixed_sparse->x[1] = ( pulses[0] & 15) * 3 + pulse_subset + 1; |
| 355 | |
| 356 | fixed_sparse->y[0] = pulses[0] & 0x200 ? -1 : 1; |
| 357 | fixed_sparse->y[1] = -fixed_sparse->y[0]; |
| 358 | fixed_sparse->n = 2; |
| 359 | } |
| 360 | break; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | static void decode_frame(SiprContext *ctx, SiprParameters *params, |
| 365 | float *out_data) |
| 366 | { |
| 367 | int i, j; |
| 368 | int subframe_count = modes[ctx->mode].subframe_count; |
| 369 | int frame_size = subframe_count * SUBFR_SIZE; |
| 370 | float Az[LP_FILTER_ORDER * MAX_SUBFRAME_COUNT]; |
| 371 | float *excitation; |
| 372 | float ir_buf[SUBFR_SIZE + LP_FILTER_ORDER]; |
| 373 | float lsf_new[LP_FILTER_ORDER]; |
| 374 | float *impulse_response = ir_buf + LP_FILTER_ORDER; |
| 375 | float *synth = ctx->synth_buf + 16; // 16 instead of LP_FILTER_ORDER for |
| 376 | // memory alignment |
| 377 | int t0_first = 0; |
| 378 | AMRFixed fixed_cb; |
| 379 | |
| 380 | memset(ir_buf, 0, LP_FILTER_ORDER * sizeof(float)); |
| 381 | lsf_decode_fp(lsf_new, ctx->lsf_history, params); |
| 382 | |
| 383 | sipr_decode_lp(lsf_new, ctx->lsp_history, Az, subframe_count); |
| 384 | |
| 385 | memcpy(ctx->lsp_history, lsf_new, LP_FILTER_ORDER * sizeof(float)); |
| 386 | |
| 387 | excitation = ctx->excitation + PITCH_DELAY_MAX + L_INTERPOL; |
| 388 | |
| 389 | for (i = 0; i < subframe_count; i++) { |
| 390 | float *pAz = Az + i*LP_FILTER_ORDER; |
| 391 | float fixed_vector[SUBFR_SIZE]; |
| 392 | int T0,T0_frac; |
| 393 | float pitch_gain, gain_code, avg_energy; |
| 394 | |
| 395 | ff_decode_pitch_lag(&T0, &T0_frac, params->pitch_delay[i], t0_first, i, |
| 396 | ctx->mode == MODE_5k0, 6); |
| 397 | |
| 398 | if (i == 0 || (i == 2 && ctx->mode == MODE_5k0)) |
| 399 | t0_first = T0; |
| 400 | |
| 401 | ff_acelp_interpolatef(excitation, excitation - T0 + (T0_frac <= 0), |
| 402 | ff_b60_sinc, 6, |
| 403 | 2 * ((2 + T0_frac)%3 + 1), LP_FILTER_ORDER, |
| 404 | SUBFR_SIZE); |
| 405 | |
| 406 | decode_fixed_sparse(&fixed_cb, params->fc_indexes[i], ctx->mode, |
| 407 | ctx->past_pitch_gain < 0.8); |
| 408 | |
| 409 | eval_ir(pAz, T0, impulse_response, modes[ctx->mode].pitch_sharp_factor); |
| 410 | |
| 411 | convolute_with_sparse(fixed_vector, &fixed_cb, impulse_response, |
| 412 | SUBFR_SIZE); |
| 413 | |
| 414 | avg_energy = (0.01 + avpriv_scalarproduct_float_c(fixed_vector, |
| 415 | fixed_vector, |
| 416 | SUBFR_SIZE)) / |
| 417 | SUBFR_SIZE; |
| 418 | |
| 419 | ctx->past_pitch_gain = pitch_gain = gain_cb[params->gc_index[i]][0]; |
| 420 | |
| 421 | gain_code = ff_amr_set_fixed_gain(gain_cb[params->gc_index[i]][1], |
| 422 | avg_energy, ctx->energy_history, |
| 423 | 34 - 15.0/(0.05*M_LN10/M_LN2), |
| 424 | pred); |
| 425 | |
| 426 | ff_weighted_vector_sumf(excitation, excitation, fixed_vector, |
| 427 | pitch_gain, gain_code, SUBFR_SIZE); |
| 428 | |
| 429 | pitch_gain *= 0.5 * pitch_gain; |
| 430 | pitch_gain = FFMIN(pitch_gain, 0.4); |
| 431 | |
| 432 | ctx->gain_mem = 0.7 * ctx->gain_mem + 0.3 * pitch_gain; |
| 433 | ctx->gain_mem = FFMIN(ctx->gain_mem, pitch_gain); |
| 434 | gain_code *= ctx->gain_mem; |
| 435 | |
| 436 | for (j = 0; j < SUBFR_SIZE; j++) |
| 437 | fixed_vector[j] = excitation[j] - gain_code * fixed_vector[j]; |
| 438 | |
| 439 | if (ctx->mode == MODE_5k0) { |
| 440 | postfilter_5k0(ctx, pAz, fixed_vector); |
| 441 | |
| 442 | ff_celp_lp_synthesis_filterf(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i*SUBFR_SIZE, |
| 443 | pAz, excitation, SUBFR_SIZE, |
| 444 | LP_FILTER_ORDER); |
| 445 | } |
| 446 | |
| 447 | ff_celp_lp_synthesis_filterf(synth + i*SUBFR_SIZE, pAz, fixed_vector, |
| 448 | SUBFR_SIZE, LP_FILTER_ORDER); |
| 449 | |
| 450 | excitation += SUBFR_SIZE; |
| 451 | } |
| 452 | |
| 453 | memcpy(synth - LP_FILTER_ORDER, synth + frame_size - LP_FILTER_ORDER, |
| 454 | LP_FILTER_ORDER * sizeof(float)); |
| 455 | |
| 456 | if (ctx->mode == MODE_5k0) { |
| 457 | for (i = 0; i < subframe_count; i++) { |
| 458 | float energy = avpriv_scalarproduct_float_c(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE, |
| 459 | ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE, |
| 460 | SUBFR_SIZE); |
| 461 | ff_adaptive_gain_control(&synth[i * SUBFR_SIZE], |
| 462 | &synth[i * SUBFR_SIZE], energy, |
| 463 | SUBFR_SIZE, 0.9, &ctx->postfilter_agc); |
| 464 | } |
| 465 | |
| 466 | memcpy(ctx->postfilter_syn5k0, ctx->postfilter_syn5k0 + frame_size, |
| 467 | LP_FILTER_ORDER*sizeof(float)); |
| 468 | } |
| 469 | memmove(ctx->excitation, excitation - PITCH_DELAY_MAX - L_INTERPOL, |
| 470 | (PITCH_DELAY_MAX + L_INTERPOL) * sizeof(float)); |
| 471 | |
| 472 | ff_acelp_apply_order_2_transfer_function(out_data, synth, |
| 473 | (const float[2]) {-1.99997 , 1.000000000}, |
| 474 | (const float[2]) {-1.93307352, 0.935891986}, |
| 475 | 0.939805806, |
| 476 | ctx->highpass_filt_mem, |
| 477 | frame_size); |
| 478 | } |
| 479 | |
| 480 | static av_cold int sipr_decoder_init(AVCodecContext * avctx) |
| 481 | { |
| 482 | SiprContext *ctx = avctx->priv_data; |
| 483 | int i; |
| 484 | |
| 485 | switch (avctx->block_align) { |
| 486 | case 20: ctx->mode = MODE_16k; break; |
| 487 | case 19: ctx->mode = MODE_8k5; break; |
| 488 | case 29: ctx->mode = MODE_6k5; break; |
| 489 | case 37: ctx->mode = MODE_5k0; break; |
| 490 | default: |
| 491 | if (avctx->bit_rate > 12200) ctx->mode = MODE_16k; |
| 492 | else if (avctx->bit_rate > 7500 ) ctx->mode = MODE_8k5; |
| 493 | else if (avctx->bit_rate > 5750 ) ctx->mode = MODE_6k5; |
| 494 | else ctx->mode = MODE_5k0; |
| 495 | av_log(avctx, AV_LOG_WARNING, |
| 496 | "Invalid block_align: %d. Mode %s guessed based on bitrate: %d\n", |
| 497 | avctx->block_align, modes[ctx->mode].mode_name, avctx->bit_rate); |
| 498 | } |
| 499 | |
| 500 | av_log(avctx, AV_LOG_DEBUG, "Mode: %s\n", modes[ctx->mode].mode_name); |
| 501 | |
| 502 | if (ctx->mode == MODE_16k) { |
| 503 | ff_sipr_init_16k(ctx); |
| 504 | ctx->decode_frame = ff_sipr_decode_frame_16k; |
| 505 | } else { |
| 506 | ctx->decode_frame = decode_frame; |
| 507 | } |
| 508 | |
| 509 | for (i = 0; i < LP_FILTER_ORDER; i++) |
| 510 | ctx->lsp_history[i] = cos((i+1) * M_PI / (LP_FILTER_ORDER + 1)); |
| 511 | |
| 512 | for (i = 0; i < 4; i++) |
| 513 | ctx->energy_history[i] = -14; |
| 514 | |
| 515 | avctx->channels = 1; |
| 516 | avctx->channel_layout = AV_CH_LAYOUT_MONO; |
| 517 | avctx->sample_fmt = AV_SAMPLE_FMT_FLT; |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static int sipr_decode_frame(AVCodecContext *avctx, void *data, |
| 523 | int *got_frame_ptr, AVPacket *avpkt) |
| 524 | { |
| 525 | SiprContext *ctx = avctx->priv_data; |
| 526 | AVFrame *frame = data; |
| 527 | const uint8_t *buf=avpkt->data; |
| 528 | SiprParameters parm; |
| 529 | const SiprModeParam *mode_par = &modes[ctx->mode]; |
| 530 | GetBitContext gb; |
| 531 | float *samples; |
| 532 | int subframe_size = ctx->mode == MODE_16k ? L_SUBFR_16k : SUBFR_SIZE; |
| 533 | int i, ret; |
| 534 | |
| 535 | ctx->avctx = avctx; |
| 536 | if (avpkt->size < (mode_par->bits_per_frame >> 3)) { |
| 537 | av_log(avctx, AV_LOG_ERROR, |
| 538 | "Error processing packet: packet size (%d) too small\n", |
| 539 | avpkt->size); |
| 540 | return -1; |
| 541 | } |
| 542 | |
| 543 | /* get output buffer */ |
| 544 | frame->nb_samples = mode_par->frames_per_packet * subframe_size * |
| 545 | mode_par->subframe_count; |
| 546 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 547 | return ret; |
| 548 | samples = (float *)frame->data[0]; |
| 549 | |
| 550 | init_get_bits(&gb, buf, mode_par->bits_per_frame); |
| 551 | |
| 552 | for (i = 0; i < mode_par->frames_per_packet; i++) { |
| 553 | decode_parameters(&parm, &gb, mode_par); |
| 554 | |
| 555 | ctx->decode_frame(ctx, &parm, samples); |
| 556 | |
| 557 | samples += subframe_size * mode_par->subframe_count; |
| 558 | } |
| 559 | |
| 560 | *got_frame_ptr = 1; |
| 561 | |
| 562 | return mode_par->bits_per_frame >> 3; |
| 563 | } |
| 564 | |
| 565 | AVCodec ff_sipr_decoder = { |
| 566 | .name = "sipr", |
| 567 | .long_name = NULL_IF_CONFIG_SMALL("RealAudio SIPR / ACELP.NET"), |
| 568 | .type = AVMEDIA_TYPE_AUDIO, |
| 569 | .id = AV_CODEC_ID_SIPR, |
| 570 | .priv_data_size = sizeof(SiprContext), |
| 571 | .init = sipr_decoder_init, |
| 572 | .decode = sipr_decode_frame, |
| 573 | .capabilities = CODEC_CAP_DR1, |
| 574 | }; |