FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/sipr.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 203 213 95.3%
Branches: 90 100 90.0%

Line Branch Exec Source
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 5190 static void dequant(float *out, const int *idx, const float * const cbs[])
143 {
144 int i;
145 5190 int stride = 2;
146 5190 int num_vec = 5;
147
148
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31140 for (i = 0; i < num_vec; i++)
149 25950 memcpy(out + stride*i, cbs[i] + stride*idx[i], stride*sizeof(float));
150
151 5190 }
152
153 5190 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 5190 dequant(lsf_tmp, parm->vq_indexes, lsf_codebooks);
160
161
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57090 for (i = 0; i < LP_FILTER_ORDER; i++)
162 51900 lsfnew[i] = lsf_history[i] * 0.33 + lsf_tmp[i] + mean_lsf[i];
163
164 5190 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 5190 ff_set_min_dist_lsf(lsfnew, LSFQ_DIFF_MIN, LP_FILTER_ORDER - 1);
169
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5190 lsfnew[9] = FFMIN(lsfnew[LP_FILTER_ORDER - 1], 1.3 * M_PI);
170
171 5190 memcpy(lsf_history, lsf_tmp, LP_FILTER_ORDER * sizeof(*lsf_history));
172
173
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51900 for (i = 0; i < LP_FILTER_ORDER - 1; i++)
174 46710 lsfnew[i] = cos(lsfnew[i]);
175 5190 lsfnew[LP_FILTER_ORDER - 1] *= 6.153848 / M_PI;
176 5190 }
177
178 /** Apply pitch lag to the fixed vector (AMR section 6.1.2). */
179 16918 static void pitch_sharpening(int pitch_lag_int, float beta,
180 float *fixed_vector)
181 {
182 int i;
183
184
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88197 for (i = pitch_lag_int; i < SUBFR_SIZE; i++)
185 71279 fixed_vector[i] += beta * fixed_vector[i - pitch_lag_int];
186 16918 }
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 8441 static void decode_parameters(SiprParameters* parms, GetBitContext *pgb,
194 const SiprModeParam *p)
195 {
196 int i, j;
197
198
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8441 if (p->ma_predictor_bits)
199 3251 parms->ma_pred_switch = get_bits(pgb, p->ma_predictor_bits);
200
201
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50646 for (i = 0; i < 5; i++)
202 42205 parms->vq_indexes[i] = get_bits(pgb, p->vq_indexes_bits[i]);
203
204
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31861 for (i = 0; i < p->subframe_count; i++) {
205 23420 parms->pitch_delay[i] = get_bits(pgb, p->pitch_delay_bits[i]);
206
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23420 if (p->gp_index_bits)
207 6502 parms->gp_index[i] = get_bits(pgb, p->gp_index_bits);
208
209
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132454 for (j = 0; j < p->number_of_fc_indexes; j++)
210 109034 parms->fc_indexes[i][j] = get_bits(pgb, p->fc_index_bits[j]);
211
212 23420 parms->gc_index[i] = get_bits(pgb, p->gc_index_bits);
213 }
214 8441 }
215
216 5190 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 5190 float t, t0 = 1.0 / num_subfr;
222
223 5190 t = t0 * 0.5;
224
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22108 for (i = 0; i < num_subfr; i++) {
225
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186098 for (j = 0; j < LP_FILTER_ORDER; j++)
226 169180 lsfint[j] = lsfold[j] * (1 - t) + t * lsfnew[j];
227
228 16918 ff_amrwb_lsp2lpc(lsfint, Az, LP_FILTER_ORDER);
229 16918 Az += LP_FILTER_ORDER;
230 16918 t += t0;
231 }
232 5190 }
233
234 /**
235 * Evaluate the adaptive impulse response.
236 */
237 16918 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 16918 tmp1[0] = 1.0;
244
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186098 for (i = 0; i < LP_FILTER_ORDER; i++) {
245 169180 tmp1[i+1] = Az[i] * ff_pow_0_55[i];
246 169180 tmp2[i ] = Az[i] * ff_pow_0_7 [i];
247 }
248 16918 memset(tmp1 + 11, 0, 37 * sizeof(float));
249
250 16918 ff_celp_lp_synthesis_filterf(freq, tmp2, tmp1, SUBFR_SIZE,
251 LP_FILTER_ORDER);
252
253 16918 pitch_sharpening(pitch_lag, pitch_sharp_factor, freq);
254 16918 }
255
256 /**
257 * Evaluate the convolution of a vector with a sparse vector.
258 */
259 16918 static void convolute_with_sparse(float *out, const AMRFixed *pulses,
260 const float *shape, int length)
261 {
262 int i, j;
263
264 16918 memset(out, 0, length*sizeof(float));
265
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76642 for (i = 0; i < pulses->n; i++)
266
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1639132 for (j = pulses->x[i]; j < length; j++)
267 1579408 out[j] += pulses->y[i] * shape[j - pulses->x[i]];
268 16918 }
269
270 /**
271 * Apply postfilter, very similar to AMR one.
272 */
273 3370 static void postfilter_5k0(SiprContext *ctx, const float *lpc, float *samples)
274 {
275 float buf[SUBFR_SIZE + LP_FILTER_ORDER];
276 3370 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
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37070 for (i = 0; i < LP_FILTER_ORDER; i++) {
282 33700 lpc_d[i] = lpc[i] * ff_pow_0_75[i];
283 33700 lpc_n[i] = lpc[i] * ff_pow_0_5 [i];
284 };
285
286 3370 memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem,
287 LP_FILTER_ORDER*sizeof(float));
288
289 3370 ff_celp_lp_synthesis_filterf(pole_out, lpc_d, samples, SUBFR_SIZE,
290 LP_FILTER_ORDER);
291
292 3370 memcpy(ctx->postfilter_mem, pole_out + SUBFR_SIZE - LP_FILTER_ORDER,
293 LP_FILTER_ORDER*sizeof(float));
294
295 3370 ff_tilt_compensation(&ctx->tilt_mem, 0.4, pole_out, SUBFR_SIZE);
296
297 3370 memcpy(pole_out - LP_FILTER_ORDER, ctx->postfilter_mem5k0,
298 LP_FILTER_ORDER*sizeof(*pole_out));
299
300 3370 memcpy(ctx->postfilter_mem5k0, pole_out + SUBFR_SIZE - LP_FILTER_ORDER,
301 LP_FILTER_ORDER*sizeof(*pole_out));
302
303 3370 ff_celp_lp_zero_synthesis_filterf(samples, lpc_n, pole_out, SUBFR_SIZE,
304 LP_FILTER_ORDER);
305
306 3370 }
307
308 16918 static void decode_fixed_sparse(AMRFixed *fixed_sparse, const int16_t *pulses,
309 SiprMode mode, int low_gain)
310 {
311 int i;
312
313
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16918 switch (mode) {
314 10086 case MODE_6k5:
315
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40344 for (i = 0; i < 3; i++) {
316 30258 fixed_sparse->x[i] = 3 * (pulses[i] & 0xf) + i;
317
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30258 fixed_sparse->y[i] = pulses[i] & 0x10 ? -1 : 1;
318 }
319 10086 fixed_sparse->n = 3;
320 10086 break;
321 3462 case MODE_8k5:
322
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13848 for (i = 0; i < 3; i++) {
323 10386 fixed_sparse->x[2*i ] = 3 * ((pulses[i] >> 4) & 0xf) + i;
324 10386 fixed_sparse->x[2*i + 1] = 3 * ( pulses[i] & 0xf) + i;
325
326
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10386 fixed_sparse->y[2*i ] = (pulses[i] & 0x100) ? -1.0: 1.0;
327
328 10386 fixed_sparse->y[2*i + 1] =
329 10386 (fixed_sparse->x[2*i + 1] < fixed_sparse->x[2*i]) ?
330
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10386 -fixed_sparse->y[2*i ] : fixed_sparse->y[2*i];
331 }
332
333 3462 fixed_sparse->n = 6;
334 3462 break;
335 3370 case MODE_5k0:
336 default:
337
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3370 if (low_gain) {
338 1954 int offset = (pulses[0] & 0x200) ? 2 : 0;
339 1954 int val = pulses[0];
340
341
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7816 for (i = 0; i < 3; i++) {
342 5862 int index = (val & 0x7) * 6 + 4 - i*2;
343
344
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5862 fixed_sparse->y[i] = (offset + index) & 0x3 ? -1 : 1;
345 5862 fixed_sparse->x[i] = index;
346
347 5862 val >>= 3;
348 }
349 1954 fixed_sparse->n = 3;
350 } else {
351 1416 int pulse_subset = (pulses[0] >> 8) & 1;
352
353 1416 fixed_sparse->x[0] = ((pulses[0] >> 4) & 15) * 3 + pulse_subset;
354 1416 fixed_sparse->x[1] = ( pulses[0] & 15) * 3 + pulse_subset + 1;
355
356
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1416 fixed_sparse->y[0] = pulses[0] & 0x200 ? -1 : 1;
357 1416 fixed_sparse->y[1] = -fixed_sparse->y[0];
358 1416 fixed_sparse->n = 2;
359 }
360 3370 break;
361 }
362 16918 }
363
364 5190 static void decode_frame(SiprContext *ctx, SiprParameters *params,
365 float *out_data)
366 {
367 int i, j;
368 5190 int subframe_count = modes[ctx->mode].subframe_count;
369 5190 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 5190 float *impulse_response = ir_buf + LP_FILTER_ORDER;
375 5190 float *synth = ctx->synth_buf + 16; // 16 instead of LP_FILTER_ORDER for
376 // memory alignment
377 5190 int t0_first = 0;
378 AMRFixed fixed_cb;
379
380 5190 memset(ir_buf, 0, LP_FILTER_ORDER * sizeof(float));
381 5190 lsf_decode_fp(lsf_new, ctx->lsf_history, params);
382
383 5190 sipr_decode_lp(lsf_new, ctx->lsp_history, Az, subframe_count);
384
385 5190 memcpy(ctx->lsp_history, lsf_new, LP_FILTER_ORDER * sizeof(float));
386
387 5190 excitation = ctx->excitation + PITCH_DELAY_MAX + L_INTERPOL;
388
389
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22108 for (i = 0; i < subframe_count; i++) {
390 16918 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 16918 ff_decode_pitch_lag(&T0, &T0_frac, params->pitch_delay[i], t0_first, i,
396 16918 ctx->mode == MODE_5k0, 6);
397
398
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16918 if (i == 0 || (i == 2 && ctx->mode == MODE_5k0))
399 5864 t0_first = T0;
400
401 16918 ff_acelp_interpolatef(excitation, excitation - T0 + (T0_frac <= 0),
402 ff_b60_sinc, 6,
403
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16918 2 * ((2 + T0_frac)%3 + 1), LP_FILTER_ORDER,
404 SUBFR_SIZE);
405
406 16918 decode_fixed_sparse(&fixed_cb, params->fc_indexes[i], ctx->mode,
407 16918 ctx->past_pitch_gain < 0.8);
408
409 16918 eval_ir(pAz, T0, impulse_response, modes[ctx->mode].pitch_sharp_factor);
410
411 16918 convolute_with_sparse(fixed_vector, &fixed_cb, impulse_response,
412 SUBFR_SIZE);
413
414 16918 avg_energy = (0.01 + avpriv_scalarproduct_float_c(fixed_vector,
415 fixed_vector,
416 16918 SUBFR_SIZE)) /
417 SUBFR_SIZE;
418
419 16918 ctx->past_pitch_gain = pitch_gain = gain_cb[params->gc_index[i]][0];
420
421 16918 gain_code = ff_amr_set_fixed_gain(gain_cb[params->gc_index[i]][1],
422 16918 avg_energy, ctx->energy_history,
423 34 - 15.0/(0.05*M_LN10/M_LN2),
424 pred);
425
426 16918 ff_weighted_vector_sumf(excitation, excitation, fixed_vector,
427 pitch_gain, gain_code, SUBFR_SIZE);
428
429 16918 pitch_gain *= 0.5 * pitch_gain;
430
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16918 pitch_gain = FFMIN(pitch_gain, 0.4);
431
432 16918 ctx->gain_mem = 0.7 * ctx->gain_mem + 0.3 * pitch_gain;
433
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16918 ctx->gain_mem = FFMIN(ctx->gain_mem, pitch_gain);
434 16918 gain_code *= ctx->gain_mem;
435
436
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828982 for (j = 0; j < SUBFR_SIZE; j++)
437 812064 fixed_vector[j] = excitation[j] - gain_code * fixed_vector[j];
438
439
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16918 if (ctx->mode == MODE_5k0) {
440 3370 postfilter_5k0(ctx, pAz, fixed_vector);
441
442 3370 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 16918 ff_celp_lp_synthesis_filterf(synth + i*SUBFR_SIZE, pAz, fixed_vector,
448 SUBFR_SIZE, LP_FILTER_ORDER);
449
450 16918 excitation += SUBFR_SIZE;
451 }
452
453 5190 memcpy(synth - LP_FILTER_ORDER, synth + frame_size - LP_FILTER_ORDER,
454 LP_FILTER_ORDER * sizeof(float));
455
456
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5190 if (ctx->mode == MODE_5k0) {
457
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4044 for (i = 0; i < subframe_count; i++) {
458 3370 float energy = avpriv_scalarproduct_float_c(ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE,
459 3370 ctx->postfilter_syn5k0 + LP_FILTER_ORDER + i * SUBFR_SIZE,
460 SUBFR_SIZE);
461 3370 ff_adaptive_gain_control(&synth[i * SUBFR_SIZE],
462 3370 &synth[i * SUBFR_SIZE], energy,
463 SUBFR_SIZE, 0.9, &ctx->postfilter_agc);
464 }
465
466 674 memcpy(ctx->postfilter_syn5k0, ctx->postfilter_syn5k0 + frame_size,
467 LP_FILTER_ORDER*sizeof(float));
468 }
469 5190 memmove(ctx->excitation, excitation - PITCH_DELAY_MAX - L_INTERPOL,
470 (PITCH_DELAY_MAX + L_INTERPOL) * sizeof(float));
471
472 5190 ff_acelp_apply_order_2_transfer_function(out_data, synth,
473 5190 (const float[2]) {-1.99997 , 1.000000000},
474 5190 (const float[2]) {-1.93307352, 0.935891986},
475 0.939805806,
476 5190 ctx->highpass_filt_mem,
477 frame_size);
478 5190 }
479
480 9 static av_cold int sipr_decoder_init(AVCodecContext * avctx)
481 {
482 9 SiprContext *ctx = avctx->priv_data;
483 int i;
484
485
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9 switch (avctx->block_align) {
486 2 case 20: ctx->mode = MODE_16k; break;
487 3 case 19: ctx->mode = MODE_8k5; break;
488 2 case 29: ctx->mode = MODE_6k5; break;
489 2 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, avctx->bit_rate);
498 }
499
500 9 av_log(avctx, AV_LOG_DEBUG, "Mode: %s\n", modes[ctx->mode].mode_name);
501
502
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9 if (ctx->mode == MODE_16k) {
503 2 ff_sipr_init_16k(ctx);
504 2 ctx->decode_frame = ff_sipr_decode_frame_16k;
505 } else {
506 7 ctx->decode_frame = decode_frame;
507 }
508
509
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99 for (i = 0; i < LP_FILTER_ORDER; i++)
510 90 ctx->lsp_history[i] = cos((i+1) * M_PI / (LP_FILTER_ORDER + 1));
511
512
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45 for (i = 0; i < 4; i++)
513 36 ctx->energy_history[i] = -14;
514
515 9 avctx->channels = 1;
516 9 avctx->channel_layout = AV_CH_LAYOUT_MONO;
517 9 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
518
519 9 return 0;
520 }
521
522 6423 static int sipr_decode_frame(AVCodecContext *avctx, void *data,
523 int *got_frame_ptr, AVPacket *avpkt)
524 {
525 6423 SiprContext *ctx = avctx->priv_data;
526 6423 AVFrame *frame = data;
527 6423 const uint8_t *buf=avpkt->data;
528 SiprParameters parm;
529 6423 const SiprModeParam *mode_par = &modes[ctx->mode];
530 GetBitContext gb;
531 float *samples;
532
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6423 int subframe_size = ctx->mode == MODE_16k ? L_SUBFR_16k : SUBFR_SIZE;
533 int i, ret;
534
535 6423 ctx->avctx = avctx;
536
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6423 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 6423 frame->nb_samples = mode_par->frames_per_packet * subframe_size *
545 6423 mode_par->subframe_count;
546
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6423 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
547 return ret;
548 6423 samples = (float *)frame->data[0];
549
550 6423 init_get_bits(&gb, buf, mode_par->bits_per_frame);
551
552
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14864 for (i = 0; i < mode_par->frames_per_packet; i++) {
553 8441 decode_parameters(&parm, &gb, mode_par);
554
555 8441 ctx->decode_frame(ctx, &parm, samples);
556
557 8441 samples += subframe_size * mode_par->subframe_count;
558 }
559
560 6423 *got_frame_ptr = 1;
561
562 6423 return mode_par->bits_per_frame >> 3;
563 }
564
565 const 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 | AV_CODEC_CAP_CHANNEL_CONF,
574 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
575 };
576