blob: 70d460a678f4d86aeba33c94e5a6a5638b7842d8
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 | |
32 | #define BITSTREAM_READER_LE |
33 | #include "avcodec.h" |
34 | #include "get_bits.h" |
35 | #include "internal.h" |
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 SiprModeParam { |
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: %"PRId64"\n", |
497 | avctx->block_align, modes[ctx->mode].mode_name, (int64_t)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 AVERROR_INVALIDDATA; |
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 = AV_CODEC_CAP_DR1, |
574 | }; |
575 |