FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/amrwbdec.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 497 519 95.8%
Branches: 230 247 93.1%

Line Branch Exec Source
1 /*
2 * AMR wideband decoder
3 * Copyright (c) 2010 Marcelo Galvao Povoa
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A particular PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * AMR wideband decoder
25 */
26
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/common.h"
29 #include "libavutil/float_dsp.h"
30 #include "libavutil/lfg.h"
31
32 #include "avcodec.h"
33 #include "lsp.h"
34 #include "celp_filters.h"
35 #include "celp_math.h"
36 #include "acelp_filters.h"
37 #include "acelp_vectors.h"
38 #include "acelp_pitch_delay.h"
39 #include "codec_internal.h"
40 #include "internal.h"
41
42 #define AMR_USE_16BIT_TABLES
43 #include "amr.h"
44
45 #include "amrwbdata.h"
46 #include "mips/amrwbdec_mips.h"
47
48 typedef struct AMRWBContext {
49 AMRWBFrame frame; ///< AMRWB parameters decoded from bitstream
50 enum Mode fr_cur_mode; ///< mode index of current frame
51 uint8_t fr_quality; ///< frame quality index (FQI)
52 float isf_cur[LP_ORDER]; ///< working ISF vector from current frame
53 float isf_q_past[LP_ORDER]; ///< quantized ISF vector of the previous frame
54 float isf_past_final[LP_ORDER]; ///< final processed ISF vector of the previous frame
55 double isp[4][LP_ORDER]; ///< ISP vectors from current frame
56 double isp_sub4_past[LP_ORDER]; ///< ISP vector for the 4th subframe of the previous frame
57
58 float lp_coef[4][LP_ORDER]; ///< Linear Prediction Coefficients from ISP vector
59
60 uint8_t base_pitch_lag; ///< integer part of pitch lag for the next relative subframe
61 uint8_t pitch_lag_int; ///< integer part of pitch lag of the previous subframe
62
63 float excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 2 + AMRWB_SFR_SIZE]; ///< current excitation and all necessary excitation history
64 float *excitation; ///< points to current excitation in excitation_buf[]
65
66 float pitch_vector[AMRWB_SFR_SIZE]; ///< adaptive codebook (pitch) vector for current subframe
67 float fixed_vector[AMRWB_SFR_SIZE]; ///< algebraic codebook (fixed) vector for current subframe
68
69 float prediction_error[4]; ///< quantified prediction errors {20log10(^gamma_gc)} for previous four subframes
70 float pitch_gain[6]; ///< quantified pitch gains for the current and previous five subframes
71 float fixed_gain[2]; ///< quantified fixed gains for the current and previous subframes
72
73 float tilt_coef; ///< {beta_1} related to the voicing of the previous subframe
74
75 float prev_sparse_fixed_gain; ///< previous fixed gain; used by anti-sparseness to determine "onset"
76 uint8_t prev_ir_filter_nr; ///< previous impulse response filter "impNr": 0 - strong, 1 - medium, 2 - none
77 float prev_tr_gain; ///< previous initial gain used by noise enhancer for threshold
78
79 float samples_az[LP_ORDER + AMRWB_SFR_SIZE]; ///< low-band samples and memory from synthesis at 12.8kHz
80 float samples_up[UPS_MEM_SIZE + AMRWB_SFR_SIZE]; ///< low-band samples and memory processed for upsampling
81 float samples_hb[LP_ORDER_16k + AMRWB_SFR_SIZE_16k]; ///< high-band samples and memory from synthesis at 16kHz
82
83 float hpf_31_mem[2], hpf_400_mem[2]; ///< previous values in the high pass filters
84 float demph_mem[1]; ///< previous value in the de-emphasis filter
85 float bpf_6_7_mem[HB_FIR_SIZE]; ///< previous values in the high-band band pass filter
86 float lpf_7_mem[HB_FIR_SIZE]; ///< previous values in the high-band low pass filter
87
88 AVLFG prng; ///< random number generator for white noise excitation
89 uint8_t first_frame; ///< flag active during decoding of the first frame
90 ACELPFContext acelpf_ctx; ///< context for filters for ACELP-based codecs
91 ACELPVContext acelpv_ctx; ///< context for vector operations for ACELP-based codecs
92 CELPFContext celpf_ctx; ///< context for filters for CELP-based codecs
93 CELPMContext celpm_ctx; ///< context for fixed point math operations
94
95 } AMRWBContext;
96
97 typedef struct AMRWBChannelsContext {
98 AMRWBContext ch[2];
99 } AMRWBChannelsContext;
100
101 22 static av_cold int amrwb_decode_init(AVCodecContext *avctx)
102 {
103 22 AMRWBChannelsContext *s = avctx->priv_data;
104 int i;
105
106
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22 if (avctx->ch_layout.nb_channels > 2) {
107 avpriv_report_missing_feature(avctx, ">2 channel AMR");
108 return AVERROR_PATCHWELCOME;
109 }
110
111
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22 if (!avctx->ch_layout.nb_channels) {
112 av_channel_layout_uninit(&avctx->ch_layout);
113 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
114 }
115
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22 if (!avctx->sample_rate)
116 avctx->sample_rate = 16000;
117 22 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
118
119
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44 for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
120 22 AMRWBContext *ctx = &s->ch[ch];
121
122 22 av_lfg_init(&ctx->prng, 1);
123
124 22 ctx->excitation = &ctx->excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 1];
125 22 ctx->first_frame = 1;
126
127
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374 for (i = 0; i < LP_ORDER; i++)
128 352 ctx->isf_past_final[i] = isf_init[i] * (1.0f / (1 << 15));
129
130
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110 for (i = 0; i < 4; i++)
131 88 ctx->prediction_error[i] = MIN_ENERGY;
132
133 22 ff_acelp_filter_init(&ctx->acelpf_ctx);
134 22 ff_acelp_vectors_init(&ctx->acelpv_ctx);
135 22 ff_celp_filter_init(&ctx->celpf_ctx);
136 22 ff_celp_math_init(&ctx->celpm_ctx);
137 }
138
139 22 return 0;
140 }
141
142 /**
143 * Decode the frame header in the "MIME/storage" format. This format
144 * is simpler and does not carry the auxiliary frame information.
145 *
146 * @param[in] ctx The Context
147 * @param[in] buf Pointer to the input buffer
148 *
149 * @return The decoded header length in bytes
150 */
151 6268 static int decode_mime_header(AMRWBContext *ctx, const uint8_t *buf)
152 {
153 /* Decode frame header (1st octet) */
154 6268 ctx->fr_cur_mode = buf[0] >> 3 & 0x0F;
155 6268 ctx->fr_quality = (buf[0] & 0x4) == 0x4;
156
157 6268 return 1;
158 }
159
160 /**
161 * Decode quantized ISF vectors using 36-bit indexes (6K60 mode only).
162 *
163 * @param[in] ind Array of 5 indexes
164 * @param[out] isf_q Buffer for isf_q[LP_ORDER]
165 */
166 513 static void decode_isf_indices_36b(uint16_t *ind, float *isf_q)
167 {
168 int i;
169
170
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5130 for (i = 0; i < 9; i++)
171 4617 isf_q[i] = dico1_isf[ind[0]][i] * (1.0f / (1 << 15));
172
173
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4104 for (i = 0; i < 7; i++)
174 3591 isf_q[i + 9] = dico2_isf[ind[1]][i] * (1.0f / (1 << 15));
175
176
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3078 for (i = 0; i < 5; i++)
177 2565 isf_q[i] += dico21_isf_36b[ind[2]][i] * (1.0f / (1 << 15));
178
179
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2565 for (i = 0; i < 4; i++)
180 2052 isf_q[i + 5] += dico22_isf_36b[ind[3]][i] * (1.0f / (1 << 15));
181
182
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4104 for (i = 0; i < 7; i++)
183 3591 isf_q[i + 9] += dico23_isf_36b[ind[4]][i] * (1.0f / (1 << 15));
184 513 }
185
186 /**
187 * Decode quantized ISF vectors using 46-bit indexes (except 6K60 mode).
188 *
189 * @param[in] ind Array of 7 indexes
190 * @param[out] isf_q Buffer for isf_q[LP_ORDER]
191 */
192 5755 static void decode_isf_indices_46b(uint16_t *ind, float *isf_q)
193 {
194 int i;
195
196
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57550 for (i = 0; i < 9; i++)
197 51795 isf_q[i] = dico1_isf[ind[0]][i] * (1.0f / (1 << 15));
198
199
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46040 for (i = 0; i < 7; i++)
200 40285 isf_q[i + 9] = dico2_isf[ind[1]][i] * (1.0f / (1 << 15));
201
202
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23020 for (i = 0; i < 3; i++)
203 17265 isf_q[i] += dico21_isf[ind[2]][i] * (1.0f / (1 << 15));
204
205
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23020 for (i = 0; i < 3; i++)
206 17265 isf_q[i + 3] += dico22_isf[ind[3]][i] * (1.0f / (1 << 15));
207
208
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23020 for (i = 0; i < 3; i++)
209 17265 isf_q[i + 6] += dico23_isf[ind[4]][i] * (1.0f / (1 << 15));
210
211
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23020 for (i = 0; i < 3; i++)
212 17265 isf_q[i + 9] += dico24_isf[ind[5]][i] * (1.0f / (1 << 15));
213
214
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28775 for (i = 0; i < 4; i++)
215 23020 isf_q[i + 12] += dico25_isf[ind[6]][i] * (1.0f / (1 << 15));
216 5755 }
217
218 /**
219 * Apply mean and past ISF values using the prediction factor.
220 * Updates past ISF vector.
221 *
222 * @param[in,out] isf_q Current quantized ISF
223 * @param[in,out] isf_past Past quantized ISF
224 */
225 6268 static void isf_add_mean_and_past(float *isf_q, float *isf_past)
226 {
227 int i;
228 float tmp;
229
230
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106556 for (i = 0; i < LP_ORDER; i++) {
231 100288 tmp = isf_q[i];
232 100288 isf_q[i] += isf_mean[i] * (1.0f / (1 << 15));
233 100288 isf_q[i] += PRED_FACTOR * isf_past[i];
234 100288 isf_past[i] = tmp;
235 }
236 6268 }
237
238 /**
239 * Interpolate the fourth ISP vector from current and past frames
240 * to obtain an ISP vector for each subframe.
241 *
242 * @param[in,out] isp_q ISPs for each subframe
243 * @param[in] isp4_past Past ISP for subframe 4
244 */
245 6268 static void interpolate_isp(double isp_q[4][LP_ORDER], const double *isp4_past)
246 {
247 int i, k;
248
249
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25072 for (k = 0; k < 3; k++) {
250 18804 float c = isfp_inter[k];
251
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319668 for (i = 0; i < LP_ORDER; i++)
252 300864 isp_q[k][i] = (1.0 - c) * isp4_past[i] + c * isp_q[3][i];
253 }
254 6268 }
255
256 /**
257 * Decode an adaptive codebook index into pitch lag (except 6k60, 8k85 modes).
258 * Calculate integer lag and fractional lag always using 1/4 resolution.
259 * In 1st and 3rd subframes the index is relative to last subframe integer lag.
260 *
261 * @param[out] lag_int Decoded integer pitch lag
262 * @param[out] lag_frac Decoded fractional pitch lag
263 * @param[in] pitch_index Adaptive codebook pitch index
264 * @param[in,out] base_lag_int Base integer lag used in relative subframes
265 * @param[in] subframe Current subframe index (0 to 3)
266 */
267 20968 static void decode_pitch_lag_high(int *lag_int, int *lag_frac, int pitch_index,
268 uint8_t *base_lag_int, int subframe)
269 {
270
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20968 if (subframe == 0 || subframe == 2) {
271
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10484 if (pitch_index < 376) {
272 7630 *lag_int = (pitch_index + 137) >> 2;
273 7630 *lag_frac = pitch_index - (*lag_int << 2) + 136;
274
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2854 } else if (pitch_index < 440) {
275 1248 *lag_int = (pitch_index + 257 - 376) >> 1;
276 1248 *lag_frac = (pitch_index - (*lag_int << 1) + 256 - 376) * 2;
277 /* the actual resolution is 1/2 but expressed as 1/4 */
278 } else {
279 1606 *lag_int = pitch_index - 280;
280 1606 *lag_frac = 0;
281 }
282 /* minimum lag for next subframe */
283 10484 *base_lag_int = av_clip(*lag_int - 8 - (*lag_frac < 0),
284 AMRWB_P_DELAY_MIN, AMRWB_P_DELAY_MAX - 15);
285 // XXX: the spec states clearly that *base_lag_int should be
286 // the nearest integer to *lag_int (minus 8), but the ref code
287 // actually always uses its floor, I'm following the latter
288 } else {
289 10484 *lag_int = (pitch_index + 1) >> 2;
290 10484 *lag_frac = pitch_index - (*lag_int << 2);
291 10484 *lag_int += *base_lag_int;
292 }
293 20968 }
294
295 /**
296 * Decode an adaptive codebook index into pitch lag for 8k85 and 6k60 modes.
297 * The description is analogous to decode_pitch_lag_high, but in 6k60 the
298 * relative index is used for all subframes except the first.
299 */
300 4104 static void decode_pitch_lag_low(int *lag_int, int *lag_frac, int pitch_index,
301 uint8_t *base_lag_int, int subframe, enum Mode mode)
302 {
303
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4104 if (subframe == 0 || (subframe == 2 && mode != MODE_6k60)) {
304
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1539 if (pitch_index < 116) {
305 850 *lag_int = (pitch_index + 69) >> 1;
306 850 *lag_frac = (pitch_index - (*lag_int << 1) + 68) * 2;
307 } else {
308 689 *lag_int = pitch_index - 24;
309 689 *lag_frac = 0;
310 }
311 // XXX: same problem as before
312 1539 *base_lag_int = av_clip(*lag_int - 8 - (*lag_frac < 0),
313 AMRWB_P_DELAY_MIN, AMRWB_P_DELAY_MAX - 15);
314 } else {
315 2565 *lag_int = (pitch_index + 1) >> 1;
316 2565 *lag_frac = (pitch_index - (*lag_int << 1)) * 2;
317 2565 *lag_int += *base_lag_int;
318 }
319 4104 }
320
321 /**
322 * Find the pitch vector by interpolating the past excitation at the
323 * pitch delay, which is obtained in this function.
324 *
325 * @param[in,out] ctx The context
326 * @param[in] amr_subframe Current subframe data
327 * @param[in] subframe Current subframe index (0 to 3)
328 */
329 25072 static void decode_pitch_vector(AMRWBContext *ctx,
330 const AMRWBSubFrame *amr_subframe,
331 const int subframe)
332 {
333 int pitch_lag_int, pitch_lag_frac;
334 int i;
335 25072 float *exc = ctx->excitation;
336 25072 enum Mode mode = ctx->fr_cur_mode;
337
338
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25072 if (mode <= MODE_8k85) {
339 4104 decode_pitch_lag_low(&pitch_lag_int, &pitch_lag_frac, amr_subframe->adap,
340 &ctx->base_pitch_lag, subframe, mode);
341 } else
342 20968 decode_pitch_lag_high(&pitch_lag_int, &pitch_lag_frac, amr_subframe->adap,
343 &ctx->base_pitch_lag, subframe);
344
345 25072 ctx->pitch_lag_int = pitch_lag_int;
346 25072 pitch_lag_int += pitch_lag_frac > 0;
347
348 /* Calculate the pitch vector by interpolating the past excitation at the
349 pitch lag using a hamming windowed sinc function */
350 50144 ctx->acelpf_ctx.acelp_interpolatef(exc,
351 25072 exc + 1 - pitch_lag_int,
352 ac_inter, 4,
353
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25072 pitch_lag_frac + (pitch_lag_frac > 0 ? 0 : 4),
354 LP_ORDER, AMRWB_SFR_SIZE + 1);
355
356 /* Check which pitch signal path should be used
357 * 6k60 and 8k85 modes have the ltp flag set to 0 */
358
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25072 if (amr_subframe->ltp) {
359 7140 memcpy(ctx->pitch_vector, exc, AMRWB_SFR_SIZE * sizeof(float));
360 } else {
361
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1165580 for (i = 0; i < AMRWB_SFR_SIZE; i++)
362 1147648 ctx->pitch_vector[i] = 0.18 * exc[i - 1] + 0.64 * exc[i] +
363 1147648 0.18 * exc[i + 1];
364 17932 memcpy(exc, ctx->pitch_vector, AMRWB_SFR_SIZE * sizeof(float));
365 }
366 25072 }
367
368 /** Get x bits in the index interval [lsb,lsb+len-1] inclusive */
369 #define BIT_STR(x,lsb,len) av_mod_uintp2((x) >> (lsb), (len))
370
371 /** Get the bit at specified position */
372 #define BIT_POS(x, p) (((x) >> (p)) & 1)
373
374 /**
375 * The next six functions decode_[i]p_track decode exactly i pulses
376 * positions and amplitudes (-1 or 1) in a subframe track using
377 * an encoded pulse indexing (TS 26.190 section 5.8.2).
378 *
379 * The results are given in out[], in which a negative number means
380 * amplitude -1 and vice versa (i.e., ampl(x) = x / abs(x) ).
381 *
382 * @param[out] out Output buffer (writes i elements)
383 * @param[in] code Pulse index (no. of bits varies, see below)
384 * @param[in] m (log2) Number of potential positions
385 * @param[in] off Offset for decoded positions
386 */
387 106180 static inline void decode_1p_track(int *out, int code, int m, int off)
388 {
389 106180 int pos = BIT_STR(code, 0, m) + off; ///code: m+1 bits
390
391
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106180 out[0] = BIT_POS(code, m) ? -pos : pos;
392 106180 }
393
394 147226 static inline void decode_2p_track(int *out, int code, int m, int off) ///code: 2m+1 bits
395 {
396 147226 int pos0 = BIT_STR(code, m, m) + off;
397 147226 int pos1 = BIT_STR(code, 0, m) + off;
398
399
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147226 out[0] = BIT_POS(code, 2*m) ? -pos0 : pos0;
400
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147226 out[1] = BIT_POS(code, 2*m) ? -pos1 : pos1;
401
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147226 out[1] = pos0 > pos1 ? -out[1] : out[1];
402 147226 }
403
404 68748 static void decode_3p_track(int *out, int code, int m, int off) ///code: 3m+1 bits
405 {
406 68748 int half_2p = BIT_POS(code, 2*m - 1) << (m - 1);
407
408 68748 decode_2p_track(out, BIT_STR(code, 0, 2*m - 1),
409 m - 1, off + half_2p);
410 68748 decode_1p_track(out + 2, BIT_STR(code, 2*m, m + 1), m, off);
411 68748 }
412
413 32563 static void decode_4p_track(int *out, int code, int m, int off) ///code: 4m bits
414 {
415 int half_4p, subhalf_2p;
416 32563 int b_offset = 1 << (m - 1);
417
418
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32563 switch (BIT_STR(code, 4*m - 2, 2)) { /* case ID (2 bits) */
419 3612 case 0: /* 0 pulses in A, 4 pulses in B or vice versa */
420 3612 half_4p = BIT_POS(code, 4*m - 3) << (m - 1); // which has 4 pulses
421 3612 subhalf_2p = BIT_POS(code, 2*m - 3) << (m - 2);
422
423 3612 decode_2p_track(out, BIT_STR(code, 0, 2*m - 3),
424 3612 m - 2, off + half_4p + subhalf_2p);
425 3612 decode_2p_track(out + 2, BIT_STR(code, 2*m - 2, 2*m - 1),
426 m - 1, off + half_4p);
427 3612 break;
428 7991 case 1: /* 1 pulse in A, 3 pulses in B */
429 7991 decode_1p_track(out, BIT_STR(code, 3*m - 2, m),
430 m - 1, off);
431 7991 decode_3p_track(out + 1, BIT_STR(code, 0, 3*m - 2),
432 m - 1, off + b_offset);
433 7991 break;
434 12806 case 2: /* 2 pulses in each half */
435 12806 decode_2p_track(out, BIT_STR(code, 2*m - 1, 2*m - 1),
436 m - 1, off);
437 12806 decode_2p_track(out + 2, BIT_STR(code, 0, 2*m - 1),
438 m - 1, off + b_offset);
439 12806 break;
440 8154 case 3: /* 3 pulses in A, 1 pulse in B */
441 8154 decode_3p_track(out, BIT_STR(code, m, 3*m - 2),
442 m - 1, off);
443 8154 decode_1p_track(out + 3, BIT_STR(code, 0, m),
444 m - 1, off + b_offset);
445 8154 break;
446 }
447 32563 }
448
449 13079 static void decode_5p_track(int *out, int code, int m, int off) ///code: 5m bits
450 {
451 13079 int half_3p = BIT_POS(code, 5*m - 1) << (m - 1);
452
453 13079 decode_3p_track(out, BIT_STR(code, 2*m + 1, 3*m - 2),
454 m - 1, off + half_3p);
455
456 13079 decode_2p_track(out + 3, BIT_STR(code, 0, 2*m + 1), m, off);
457 13079 }
458
459 42832 static void decode_6p_track(int *out, int code, int m, int off) ///code: 6m-2 bits
460 {
461 42832 int b_offset = 1 << (m - 1);
462 /* which half has more pulses in cases 0 to 2 */
463 42832 int half_more = BIT_POS(code, 6*m - 5) << (m - 1);
464 42832 int half_other = b_offset - half_more;
465
466
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42832 switch (BIT_STR(code, 6*m - 4, 2)) { /* case ID (2 bits) */
467 1297 case 0: /* 0 pulses in A, 6 pulses in B or vice versa */
468 1297 decode_1p_track(out, BIT_STR(code, 0, m),
469 m - 1, off + half_more);
470 1297 decode_5p_track(out + 1, BIT_STR(code, m, 5*m - 5),
471 m - 1, off + half_more);
472 1297 break;
473 7678 case 1: /* 1 pulse in A, 5 pulses in B or vice versa */
474 7678 decode_1p_track(out, BIT_STR(code, 0, m),
475 m - 1, off + half_other);
476 7678 decode_5p_track(out + 1, BIT_STR(code, m, 5*m - 5),
477 m - 1, off + half_more);
478 7678 break;
479 20251 case 2: /* 2 pulses in A, 4 pulses in B or vice versa */
480 20251 decode_2p_track(out, BIT_STR(code, 0, 2*m - 1),
481 m - 1, off + half_other);
482 20251 decode_4p_track(out + 2, BIT_STR(code, 2*m - 1, 4*m - 4),
483 m - 1, off + half_more);
484 20251 break;
485 13606 case 3: /* 3 pulses in A, 3 pulses in B */
486 13606 decode_3p_track(out, BIT_STR(code, 3*m - 2, 3*m - 2),
487 m - 1, off);
488 13606 decode_3p_track(out + 3, BIT_STR(code, 0, 3*m - 2),
489 m - 1, off + b_offset);
490 13606 break;
491 }
492 42832 }
493
494 /**
495 * Decode the algebraic codebook index to pulse positions and signs,
496 * then construct the algebraic codebook vector.
497 *
498 * @param[out] fixed_vector Buffer for the fixed codebook excitation
499 * @param[in] pulse_hi MSBs part of the pulse index array (higher modes only)
500 * @param[in] pulse_lo LSBs part of the pulse index array
501 * @param[in] mode Mode of the current frame
502 */
503 25072 static void decode_fixed_vector(float *fixed_vector, const uint16_t *pulse_hi,
504 const uint16_t *pulse_lo, const enum Mode mode)
505 {
506 /* sig_pos stores for each track the decoded pulse position indexes
507 * (1-based) multiplied by its corresponding amplitude (+1 or -1) */
508 int sig_pos[4][6];
509
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25072 int spacing = (mode == MODE_6k60) ? 2 : 4;
510 int i, j;
511
512
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25072 switch (mode) {
513 2052 case MODE_6k60:
514
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6156 for (i = 0; i < 2; i++)
515 4104 decode_1p_track(sig_pos[i], pulse_lo[i], 5, 1);
516 2052 break;
517 2052 case MODE_8k85:
518
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10260 for (i = 0; i < 4; i++)
519 8208 decode_1p_track(sig_pos[i], pulse_lo[i], 4, 1);
520 2052 break;
521 2052 case MODE_12k65:
522
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10260 for (i = 0; i < 4; i++)
523 8208 decode_2p_track(sig_pos[i], pulse_lo[i], 4, 1);
524 2052 break;
525 2052 case MODE_14k25:
526
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6156 for (i = 0; i < 2; i++)
527 4104 decode_3p_track(sig_pos[i], pulse_lo[i], 4, 1);
528
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6156 for (i = 2; i < 4; i++)
529 4104 decode_2p_track(sig_pos[i], pulse_lo[i], 4, 1);
530 2052 break;
531 2052 case MODE_15k85:
532
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10260 for (i = 0; i < 4; i++)
533 8208 decode_3p_track(sig_pos[i], pulse_lo[i], 4, 1);
534 2052 break;
535 2052 case MODE_18k25:
536
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10260 for (i = 0; i < 4; i++)
537 8208 decode_4p_track(sig_pos[i], (int) pulse_lo[i] +
538 8208 ((int) pulse_hi[i] << 14), 4, 1);
539 2052 break;
540 2052 case MODE_19k85:
541
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6156 for (i = 0; i < 2; i++)
542 4104 decode_5p_track(sig_pos[i], (int) pulse_lo[i] +
543 4104 ((int) pulse_hi[i] << 10), 4, 1);
544
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6156 for (i = 2; i < 4; i++)
545 4104 decode_4p_track(sig_pos[i], (int) pulse_lo[i] +
546 4104 ((int) pulse_hi[i] << 14), 4, 1);
547 2052 break;
548 10708 case MODE_23k05:
549 case MODE_23k85:
550
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53540 for (i = 0; i < 4; i++)
551 42832 decode_6p_track(sig_pos[i], (int) pulse_lo[i] +
552 42832 ((int) pulse_hi[i] << 11), 4, 1);
553 10708 break;
554 }
555
556 25072 memset(fixed_vector, 0, sizeof(float) * AMRWB_SFR_SIZE);
557
558
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125360 for (i = 0; i < 4; i++)
559
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500920 for (j = 0; j < pulses_nb_per_mode_tr[mode][i]; j++) {
560 400632 int pos = (FFABS(sig_pos[i][j]) - 1) * spacing + i;
561
562
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400632 fixed_vector[pos] += sig_pos[i][j] < 0 ? -1.0 : 1.0;
563 }
564 25072 }
565
566 /**
567 * Decode pitch gain and fixed gain correction factor.
568 *
569 * @param[in] vq_gain Vector-quantized index for gains
570 * @param[in] mode Mode of the current frame
571 * @param[out] fixed_gain_factor Decoded fixed gain correction factor
572 * @param[out] pitch_gain Decoded pitch gain
573 */
574 25072 static void decode_gains(const uint8_t vq_gain, const enum Mode mode,
575 float *fixed_gain_factor, float *pitch_gain)
576 {
577
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25072 const int16_t *gains = (mode <= MODE_8k85 ? qua_gain_6b[vq_gain] :
578 20968 qua_gain_7b[vq_gain]);
579
580 25072 *pitch_gain = gains[0] * (1.0f / (1 << 14));
581 25072 *fixed_gain_factor = gains[1] * (1.0f / (1 << 11));
582 25072 }
583
584 /**
585 * Apply pitch sharpening filters to the fixed codebook vector.
586 *
587 * @param[in] ctx The context
588 * @param[in,out] fixed_vector Fixed codebook excitation
589 */
590 // XXX: Spec states this procedure should be applied when the pitch
591 // lag is less than 64, but this checking seems absent in reference and AMR-NB
592 25072 static void pitch_sharpening(AMRWBContext *ctx, float *fixed_vector)
593 {
594 int i;
595
596 /* Tilt part */
597
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1604608 for (i = AMRWB_SFR_SIZE - 1; i != 0; i--)
598 1579536 fixed_vector[i] -= fixed_vector[i - 1] * ctx->tilt_coef;
599
600 /* Periodicity enhancement part */
601
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187025 for (i = ctx->pitch_lag_int; i < AMRWB_SFR_SIZE; i++)
602 161953 fixed_vector[i] += fixed_vector[i - ctx->pitch_lag_int] * 0.85;
603 25072 }
604
605 /**
606 * Calculate the voicing factor (-1.0 = unvoiced to 1.0 = voiced).
607 *
608 * @param[in] p_vector, f_vector Pitch and fixed excitation vectors
609 * @param[in] p_gain, f_gain Pitch and fixed gains
610 * @param[in] ctx The context
611 */
612 // XXX: There is something wrong with the precision here! The magnitudes
613 // of the energies are not correct. Please check the reference code carefully
614 25072 static float voice_factor(float *p_vector, float p_gain,
615 float *f_vector, float f_gain,
616 CELPMContext *ctx)
617 {
618 25072 double p_ener = (double) ctx->dot_productf(p_vector, p_vector,
619 25072 AMRWB_SFR_SIZE) *
620 25072 p_gain * p_gain;
621 25072 double f_ener = (double) ctx->dot_productf(f_vector, f_vector,
622 25072 AMRWB_SFR_SIZE) *
623 25072 f_gain * f_gain;
624
625 25072 return (p_ener - f_ener) / (p_ener + f_ener + 0.01);
626 }
627
628 /**
629 * Reduce fixed vector sparseness by smoothing with one of three IR filters,
630 * also known as "adaptive phase dispersion".
631 *
632 * @param[in] ctx The context
633 * @param[in,out] fixed_vector Unfiltered fixed vector
634 * @param[out] buf Space for modified vector if necessary
635 *
636 * @return The potentially overwritten filtered fixed vector address
637 */
638 25072 static float *anti_sparseness(AMRWBContext *ctx,
639 float *fixed_vector, float *buf)
640 {
641 int ir_filter_nr;
642
643
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25072 if (ctx->fr_cur_mode > MODE_8k85) // no filtering in higher modes
644 20968 return fixed_vector;
645
646
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4104 if (ctx->pitch_gain[0] < 0.6) {
647 2261 ir_filter_nr = 0; // strong filtering
648
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1843 } else if (ctx->pitch_gain[0] < 0.9) {
649 712 ir_filter_nr = 1; // medium filtering
650 } else
651 1131 ir_filter_nr = 2; // no filtering
652
653 /* detect 'onset' */
654
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4104 if (ctx->fixed_gain[0] > 3.0 * ctx->fixed_gain[1]) {
655
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61 if (ir_filter_nr < 2)
656 39 ir_filter_nr++;
657 } else {
658 4043 int i, count = 0;
659
660
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661
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24258 if (ctx->pitch_gain[i] < 0.6)
662 13373 count++;
663
664
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4043 if (count > 2)
665 2724 ir_filter_nr = 0;
666
667
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4043 if (ir_filter_nr > ctx->prev_ir_filter_nr + 1)
668 83 ir_filter_nr--;
669 }
670
671 /* update ir filter strength history */
672 4104 ctx->prev_ir_filter_nr = ir_filter_nr;
673
674 4104 ir_filter_nr += (ctx->fr_cur_mode == MODE_8k85);
675
676
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4104 if (ir_filter_nr < 2) {
677 int i;
678 3197 const float *coef = ir_filters_lookup[ir_filter_nr];
679
680 /* Circular convolution code in the reference
681 * decoder was modified to avoid using one
682 * extra array. The filtered vector is given by:
683 *
684 * c2(n) = sum(i,0,len-1){ c(i) * coef( (n - i + len) % len ) }
685 */
686
687 3197 memset(buf, 0, sizeof(float) * AMRWB_SFR_SIZE);
688
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207805 for (i = 0; i < AMRWB_SFR_SIZE; i++)
689
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204608 if (fixed_vector[i])
690 21471 ff_celp_circ_addf(buf, buf, coef, i, fixed_vector[i],
691 AMRWB_SFR_SIZE);
692 3197 fixed_vector = buf;
693 }
694
695 4104 return fixed_vector;
696 }
697
698 /**
699 * Calculate a stability factor {teta} based on distance between
700 * current and past isf. A value of 1 shows maximum signal stability.
701 */
702 6268 static float stability_factor(const float *isf, const float *isf_past)
703 {
704 int i;
705 6268 float acc = 0.0;
706
707
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100288 for (i = 0; i < LP_ORDER - 1; i++)
708 94020 acc += (isf[i] - isf_past[i]) * (isf[i] - isf_past[i]);
709
710 // XXX: This part is not so clear from the reference code
711 // the result is more accurate changing the "/ 256" to "* 512"
712
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6268 return FFMAX(0.0, 1.25 - acc * 0.8 * 512);
713 }
714
715 /**
716 * Apply a non-linear fixed gain smoothing in order to reduce
717 * fluctuation in the energy of excitation.
718 *
719 * @param[in] fixed_gain Unsmoothed fixed gain
720 * @param[in,out] prev_tr_gain Previous threshold gain (updated)
721 * @param[in] voice_fac Frame voicing factor
722 * @param[in] stab_fac Frame stability factor
723 *
724 * @return The smoothed gain
725 */
726 25072 static float noise_enhancer(float fixed_gain, float *prev_tr_gain,
727 float voice_fac, float stab_fac)
728 {
729 25072 float sm_fac = 0.5 * (1 - voice_fac) * stab_fac;
730 float g0;
731
732 // XXX: the following fixed-point constants used to in(de)crement
733 // gain by 1.5dB were taken from the reference code, maybe it could
734 // be simpler
735
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25072 if (fixed_gain < *prev_tr_gain) {
736
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13115 g0 = FFMIN(*prev_tr_gain, fixed_gain + fixed_gain *
737 (6226 * (1.0f / (1 << 15)))); // +1.5 dB
738 } else
739
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11957 g0 = FFMAX(*prev_tr_gain, fixed_gain *
740 (27536 * (1.0f / (1 << 15)))); // -1.5 dB
741
742 25072 *prev_tr_gain = g0; // update next frame threshold
743
744 25072 return sm_fac * g0 + (1 - sm_fac) * fixed_gain;
745 }
746
747 /**
748 * Filter the fixed_vector to emphasize the higher frequencies.
749 *
750 * @param[in,out] fixed_vector Fixed codebook vector
751 * @param[in] voice_fac Frame voicing factor
752 */
753 25072 static void pitch_enhancer(float *fixed_vector, float voice_fac)
754 {
755 int i;
756 25072 float cpe = 0.125 * (1 + voice_fac);
757 25072 float last = fixed_vector[0]; // holds c(i - 1)
758
759 25072 fixed_vector[0] -= cpe * fixed_vector[1];
760
761
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1579536 for (i = 1; i < AMRWB_SFR_SIZE - 1; i++) {
762 1554464 float cur = fixed_vector[i];
763
764 1554464 fixed_vector[i] -= cpe * (last + fixed_vector[i + 1]);
765 1554464 last = cur;
766 }
767
768 25072 fixed_vector[AMRWB_SFR_SIZE - 1] -= cpe * last;
769 25072 }
770
771 /**
772 * Conduct 16th order linear predictive coding synthesis from excitation.
773 *
774 * @param[in] ctx Pointer to the AMRWBContext
775 * @param[in] lpc Pointer to the LPC coefficients
776 * @param[out] excitation Buffer for synthesis final excitation
777 * @param[in] fixed_gain Fixed codebook gain for synthesis
778 * @param[in] fixed_vector Algebraic codebook vector
779 * @param[in,out] samples Pointer to the output samples and memory
780 */
781 25072 static void synthesis(AMRWBContext *ctx, float *lpc, float *excitation,
782 float fixed_gain, const float *fixed_vector,
783 float *samples)
784 {
785 25072 ctx->acelpv_ctx.weighted_vector_sumf(excitation, ctx->pitch_vector, fixed_vector,
786 ctx->pitch_gain[0], fixed_gain, AMRWB_SFR_SIZE);
787
788 /* emphasize pitch vector contribution in low bitrate modes */
789
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25072 if (ctx->pitch_gain[0] > 0.5 && ctx->fr_cur_mode <= MODE_8k85) {
790 int i;
791 1897 float energy = ctx->celpm_ctx.dot_productf(excitation, excitation,
792 AMRWB_SFR_SIZE);
793
794 // XXX: Weird part in both ref code and spec. A unknown parameter
795 // {beta} seems to be identical to the current pitch gain
796 1897 float pitch_factor = 0.25 * ctx->pitch_gain[0] * ctx->pitch_gain[0];
797
798
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123305 for (i = 0; i < AMRWB_SFR_SIZE; i++)
799 121408 excitation[i] += pitch_factor * ctx->pitch_vector[i];
800
801 1897 ff_scale_vector_to_given_sum_of_squares(excitation, excitation,
802 energy, AMRWB_SFR_SIZE);
803 }
804
805 25072 ctx->celpf_ctx.celp_lp_synthesis_filterf(samples, lpc, excitation,
806 AMRWB_SFR_SIZE, LP_ORDER);
807 25072 }
808
809 /**
810 * Apply to synthesis a de-emphasis filter of the form:
811 * H(z) = 1 / (1 - m * z^-1)
812 *
813 * @param[out] out Output buffer
814 * @param[in] in Input samples array with in[-1]
815 * @param[in] m Filter coefficient
816 * @param[in,out] mem State from last filtering
817 */
818 25072 static void de_emphasis(float *out, float *in, float m, float mem[1])
819 {
820 int i;
821
822 25072 out[0] = in[0] + m * mem[0];
823
824
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1604608 for (i = 1; i < AMRWB_SFR_SIZE; i++)
825 1579536 out[i] = in[i] + out[i - 1] * m;
826
827 25072 mem[0] = out[AMRWB_SFR_SIZE - 1];
828 25072 }
829
830 /**
831 * Upsample a signal by 5/4 ratio (from 12.8kHz to 16kHz) using
832 * a FIR interpolation filter. Uses past data from before *in address.
833 *
834 * @param[out] out Buffer for interpolated signal
835 * @param[in] in Current signal data (length 0.8*o_size)
836 * @param[in] o_size Output signal length
837 * @param[in] ctx The context
838 */
839 25072 static void upsample_5_4(float *out, const float *in, int o_size, CELPMContext *ctx)
840 {
841 25072 const float *in0 = in - UPS_FIR_SIZE + 1;
842 int i, j, k;
843 25072 int int_part = 0, frac_part;
844
845 25072 i = 0;
846
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426224 for (j = 0; j < o_size / 5; j++) {
847 401152 out[i] = in[int_part];
848 401152 frac_part = 4;
849 401152 i++;
850
851
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2005760 for (k = 1; k < 5; k++) {
852 3209216 out[i] = ctx->dot_productf(in0 + int_part,
853 1604608 upsample_fir[4 - frac_part],
854 UPS_MEM_SIZE);
855 1604608 int_part++;
856 1604608 frac_part--;
857 1604608 i++;
858 }
859 }
860 25072 }
861
862 /**
863 * Calculate the high-band gain based on encoded index (23k85 mode) or
864 * on the low-band speech signal and the Voice Activity Detection flag.
865 *
866 * @param[in] ctx The context
867 * @param[in] synth LB speech synthesis at 12.8k
868 * @param[in] hb_idx Gain index for mode 23k85 only
869 * @param[in] vad VAD flag for the frame
870 */
871 25072 static float find_hb_gain(AMRWBContext *ctx, const float *synth,
872 uint16_t hb_idx, uint8_t vad)
873 {
874 25072 int wsp = (vad > 0);
875 float tilt;
876 float tmp;
877
878
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25072 if (ctx->fr_cur_mode == MODE_23k85)
879 8656 return qua_hb_gain[hb_idx] * (1.0f / (1 << 14));
880
881 16416 tmp = ctx->celpm_ctx.dot_productf(synth, synth + 1, AMRWB_SFR_SIZE - 1);
882
883
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16416 if (tmp > 0) {
884 15653 tilt = tmp / ctx->celpm_ctx.dot_productf(synth, synth, AMRWB_SFR_SIZE);
885 } else
886 763 tilt = 0;
887
888 /* return gain bounded by [0.1, 1.0] */
889 16416 return av_clipf((1.0 - tilt) * (1.25 - 0.25 * wsp), 0.1, 1.0);
890 }
891
892 /**
893 * Generate the high-band excitation with the same energy from the lower
894 * one and scaled by the given gain.
895 *
896 * @param[in] ctx The context
897 * @param[out] hb_exc Buffer for the excitation
898 * @param[in] synth_exc Low-band excitation used for synthesis
899 * @param[in] hb_gain Wanted excitation gain
900 */
901 25072 static void scaled_hb_excitation(AMRWBContext *ctx, float *hb_exc,
902 const float *synth_exc, float hb_gain)
903 {
904 int i;
905 25072 float energy = ctx->celpm_ctx.dot_productf(synth_exc, synth_exc,
906 AMRWB_SFR_SIZE);
907
908 /* Generate a white-noise excitation */
909
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2030832 for (i = 0; i < AMRWB_SFR_SIZE_16k; i++)
910 2005760 hb_exc[i] = 32768.0 - (uint16_t) av_lfg_get(&ctx->prng);
911
912 25072 ff_scale_vector_to_given_sum_of_squares(hb_exc, hb_exc,
913 25072 energy * hb_gain * hb_gain,
914 AMRWB_SFR_SIZE_16k);
915 25072 }
916
917 /**
918 * Calculate the auto-correlation for the ISF difference vector.
919 */
920 6156 static float auto_correlation(float *diff_isf, float mean, int lag)
921 {
922 int i;
923 6156 float sum = 0.0;
924
925
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49248 for (i = 7; i < LP_ORDER - 2; i++) {
926 43092 float prod = (diff_isf[i] - mean) * (diff_isf[i - lag] - mean);
927 43092 sum += prod * prod;
928 }
929 6156 return sum;
930 }
931
932 /**
933 * Extrapolate a ISF vector to the 16kHz range (20th order LP)
934 * used at mode 6k60 LP filter for the high frequency band.
935 *
936 * @param[out] isf Buffer for extrapolated isf; contains LP_ORDER
937 * values on input
938 */
939 2052 static void extrapolate_isf(float isf[LP_ORDER_16k])
940 {
941 float diff_isf[LP_ORDER - 2], diff_mean;
942 float corr_lag[3];
943 float est, scale;
944 int i, j, i_max_corr;
945
946 2052 isf[LP_ORDER_16k - 1] = isf[LP_ORDER - 1];
947
948 /* Calculate the difference vector */
949
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30780 for (i = 0; i < LP_ORDER - 2; i++)
950 28728 diff_isf[i] = isf[i + 1] - isf[i];
951
952 2052 diff_mean = 0.0;
953
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26676 for (i = 2; i < LP_ORDER - 2; i++)
954 24624 diff_mean += diff_isf[i] * (1.0f / (LP_ORDER - 4));
955
956 /* Find which is the maximum autocorrelation */
957 2052 i_max_corr = 0;
958
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8208 for (i = 0; i < 3; i++) {
959 6156 corr_lag[i] = auto_correlation(diff_isf, diff_mean, i + 2);
960
961
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6156 if (corr_lag[i] > corr_lag[i_max_corr])
962 2154 i_max_corr = i;
963 }
964 2052 i_max_corr++;
965
966
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10260 for (i = LP_ORDER - 1; i < LP_ORDER_16k - 1; i++)
967 8208 isf[i] = isf[i - 1] + isf[i - 1 - i_max_corr]
968 8208 - isf[i - 2 - i_max_corr];
969
970 /* Calculate an estimate for ISF(18) and scale ISF based on the error */
971 2052 est = 7965 + (isf[2] - isf[3] - isf[4]) / 6.0;
972
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2052 scale = 0.5 * (FFMIN(est, 7600) - isf[LP_ORDER - 2]) /
973 2052 (isf[LP_ORDER_16k - 2] - isf[LP_ORDER - 2]);
974
975
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10260 for (i = LP_ORDER - 1, j = 0; i < LP_ORDER_16k - 1; i++, j++)
976 8208 diff_isf[j] = scale * (isf[i] - isf[i - 1]);
977
978 /* Stability insurance */
979
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8208 for (i = 1; i < LP_ORDER_16k - LP_ORDER; i++)
980
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6156 if (diff_isf[i] + diff_isf[i - 1] < 5.0) {
981 if (diff_isf[i] > diff_isf[i - 1]) {
982 diff_isf[i - 1] = 5.0 - diff_isf[i];
983 } else
984 diff_isf[i] = 5.0 - diff_isf[i - 1];
985 }
986
987
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10260 for (i = LP_ORDER - 1, j = 0; i < LP_ORDER_16k - 1; i++, j++)
988 8208 isf[i] = isf[i - 1] + diff_isf[j] * (1.0f / (1 << 15));
989
990 /* Scale the ISF vector for 16000 Hz */
991
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41040 for (i = 0; i < LP_ORDER_16k - 1; i++)
992 38988 isf[i] *= 0.8;
993 2052 }
994
995 /**
996 * Spectral expand the LP coefficients using the equation:
997 * y[i] = x[i] * (gamma ** i)
998 *
999 * @param[out] out Output buffer (may use input array)
1000 * @param[in] lpc LP coefficients array
1001 * @param[in] gamma Weighting factor
1002 * @param[in] size LP array size
1003 */
1004 25072 static void lpc_weighting(float *out, const float *lpc, float gamma, int size)
1005 {
1006 int i;
1007 25072 float fac = gamma;
1008
1009
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434432 for (i = 0; i < size; i++) {
1010 409360 out[i] = lpc[i] * fac;
1011 409360 fac *= gamma;
1012 }
1013 25072 }
1014
1015 /**
1016 * Conduct 20th order linear predictive coding synthesis for the high
1017 * frequency band excitation at 16kHz.
1018 *
1019 * @param[in] ctx The context
1020 * @param[in] subframe Current subframe index (0 to 3)
1021 * @param[in,out] samples Pointer to the output speech samples
1022 * @param[in] exc Generated white-noise scaled excitation
1023 * @param[in] isf Current frame isf vector
1024 * @param[in] isf_past Past frame final isf vector
1025 */
1026 25072 static void hb_synthesis(AMRWBContext *ctx, int subframe, float *samples,
1027 const float *exc, const float *isf, const float *isf_past)
1028 {
1029 float hb_lpc[LP_ORDER_16k];
1030 25072 enum Mode mode = ctx->fr_cur_mode;
1031
1032
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25072 if (mode == MODE_6k60) {
1033 float e_isf[LP_ORDER_16k]; // ISF vector for extrapolation
1034 double e_isp[LP_ORDER_16k];
1035
1036 2052 ctx->acelpv_ctx.weighted_vector_sumf(e_isf, isf_past, isf, isfp_inter[subframe],
1037 2052 1.0 - isfp_inter[subframe], LP_ORDER);
1038
1039 2052 extrapolate_isf(e_isf);
1040
1041 2052 e_isf[LP_ORDER_16k - 1] *= 2.0;
1042 2052 ff_acelp_lsf2lspd(e_isp, e_isf, LP_ORDER_16k);
1043 2052 ff_amrwb_lsp2lpc(e_isp, hb_lpc, LP_ORDER_16k);
1044
1045 2052 lpc_weighting(hb_lpc, hb_lpc, 0.9, LP_ORDER_16k);
1046 } else {
1047 23020 lpc_weighting(hb_lpc, ctx->lp_coef[subframe], 0.6, LP_ORDER);
1048 }
1049
1050
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25072 ctx->celpf_ctx.celp_lp_synthesis_filterf(samples, hb_lpc, exc, AMRWB_SFR_SIZE_16k,
1051 (mode == MODE_6k60) ? LP_ORDER_16k : LP_ORDER);
1052 25072 }
1053
1054 /**
1055 * Apply a 15th order filter to high-band samples.
1056 * The filter characteristic depends on the given coefficients.
1057 *
1058 * @param[out] out Buffer for filtered output
1059 * @param[in] fir_coef Filter coefficients
1060 * @param[in,out] mem State from last filtering (updated)
1061 * @param[in] in Input speech data (high-band)
1062 *
1063 * @remark It is safe to pass the same array in in and out parameters
1064 */
1065
1066 #ifndef hb_fir_filter
1067 33728 static void hb_fir_filter(float *out, const float fir_coef[HB_FIR_SIZE + 1],
1068 float mem[HB_FIR_SIZE], const float *in)
1069 {
1070 int i, j;
1071 float data[AMRWB_SFR_SIZE_16k + HB_FIR_SIZE]; // past and current samples
1072
1073 33728 memcpy(data, mem, HB_FIR_SIZE * sizeof(float));
1074 33728 memcpy(data + HB_FIR_SIZE, in, AMRWB_SFR_SIZE_16k * sizeof(float));
1075
1076
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2731968 for (i = 0; i < AMRWB_SFR_SIZE_16k; i++) {
1077 2698240 out[i] = 0.0;
1078
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86343680 for (j = 0; j <= HB_FIR_SIZE; j++)
1079 83645440 out[i] += data[i + j] * fir_coef[j];
1080 }
1081
1082 33728 memcpy(mem, data + AMRWB_SFR_SIZE_16k, HB_FIR_SIZE * sizeof(float));
1083 33728 }
1084 #endif /* hb_fir_filter */
1085
1086 /**
1087 * Update context state before the next subframe.
1088 */
1089 25072 static void update_sub_state(AMRWBContext *ctx)
1090 {
1091 25072 memmove(&ctx->excitation_buf[0], &ctx->excitation_buf[AMRWB_SFR_SIZE],
1092 (AMRWB_P_DELAY_MAX + LP_ORDER + 1) * sizeof(float));
1093
1094 25072 memmove(&ctx->pitch_gain[1], &ctx->pitch_gain[0], 5 * sizeof(float));
1095 25072 memmove(&ctx->fixed_gain[1], &ctx->fixed_gain[0], 1 * sizeof(float));
1096
1097 25072 memmove(&ctx->samples_az[0], &ctx->samples_az[AMRWB_SFR_SIZE],
1098 LP_ORDER * sizeof(float));
1099 25072 memmove(&ctx->samples_up[0], &ctx->samples_up[AMRWB_SFR_SIZE],
1100 UPS_MEM_SIZE * sizeof(float));
1101 25072 memmove(&ctx->samples_hb[0], &ctx->samples_hb[AMRWB_SFR_SIZE_16k],
1102 LP_ORDER_16k * sizeof(float));
1103 25072 }
1104
1105 6268 static int amrwb_decode_frame(AVCodecContext *avctx, AVFrame *frame,
1106 int *got_frame_ptr, AVPacket *avpkt)
1107 {
1108 6268 AMRWBChannelsContext *s = avctx->priv_data;
1109 6268 const uint8_t *buf = avpkt->data;
1110 6268 int buf_size = avpkt->size;
1111 int sub, i, ret;
1112
1113 /* get output buffer */
1114 6268 frame->nb_samples = 4 * AMRWB_SFR_SIZE_16k;
1115
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6268 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1116 return ret;
1117
1118
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12536 for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++) {
1119 6268 AMRWBContext *ctx = &s->ch[ch];
1120 6268 AMRWBFrame *cf = &ctx->frame;
1121 int expected_fr_size, header_size;
1122 float spare_vector[AMRWB_SFR_SIZE]; // extra stack space to hold result from anti-sparseness processing
1123 float fixed_gain_factor; // fixed gain correction factor (gamma)
1124 float *synth_fixed_vector; // pointer to the fixed vector that synthesis should use
1125 float synth_fixed_gain; // the fixed gain that synthesis should use
1126 float voice_fac, stab_fac; // parameters used for gain smoothing
1127 float synth_exc[AMRWB_SFR_SIZE]; // post-processed excitation for synthesis
1128 float hb_exc[AMRWB_SFR_SIZE_16k]; // excitation for the high frequency band
1129 float hb_samples[AMRWB_SFR_SIZE_16k]; // filtered high-band samples from synthesis
1130 float hb_gain;
1131 6268 float *buf_out = (float *)frame->extended_data[ch];
1132
1133 6268 header_size = decode_mime_header(ctx, buf);
1134 6268 expected_fr_size = ((cf_sizes_wb[ctx->fr_cur_mode] + 7) >> 3) + 1;
1135
1136
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6268 if (!ctx->fr_quality)
1137 av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted frame\n");
1138
1139
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6268 if (ctx->fr_cur_mode == NO_DATA || !ctx->fr_quality) {
1140 /* The specification suggests a "random signal" and
1141 "a muting technique" to "gradually decrease the output level". */
1142 av_samples_set_silence(&frame->extended_data[ch], 0, frame->nb_samples, 1, AV_SAMPLE_FMT_FLT);
1143 buf += expected_fr_size;
1144 buf_size -= expected_fr_size;
1145 continue;
1146 }
1147
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6268 if (ctx->fr_cur_mode > MODE_SID) {
1148 av_log(avctx, AV_LOG_ERROR,
1149 "Invalid mode %d\n", ctx->fr_cur_mode);
1150 return AVERROR_INVALIDDATA;
1151 }
1152
1153
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6268 if (buf_size < expected_fr_size) {
1154 av_log(avctx, AV_LOG_ERROR,
1155 "Frame too small (%d bytes). Truncated file?\n", buf_size);
1156 *got_frame_ptr = 0;
1157 return AVERROR_INVALIDDATA;
1158 }
1159
1160
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6268 if (ctx->fr_cur_mode == MODE_SID) { /* Comfort noise frame */
1161 avpriv_request_sample(avctx, "SID mode");
1162 return AVERROR_PATCHWELCOME;
1163 }
1164
1165 6268 ff_amr_bit_reorder((uint16_t *) &ctx->frame, sizeof(AMRWBFrame),
1166 6268 buf + header_size, amr_bit_orderings_by_mode[ctx->fr_cur_mode]);
1167
1168 /* Decode the quantized ISF vector */
1169
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6268 if (ctx->fr_cur_mode == MODE_6k60) {
1170 513 decode_isf_indices_36b(cf->isp_id, ctx->isf_cur);
1171 } else {
1172 5755 decode_isf_indices_46b(cf->isp_id, ctx->isf_cur);
1173 }
1174
1175 6268 isf_add_mean_and_past(ctx->isf_cur, ctx->isf_q_past);
1176 6268 ff_set_min_dist_lsf(ctx->isf_cur, MIN_ISF_SPACING, LP_ORDER - 1);
1177
1178 6268 stab_fac = stability_factor(ctx->isf_cur, ctx->isf_past_final);
1179
1180 6268 ctx->isf_cur[LP_ORDER - 1] *= 2.0;
1181 6268 ff_acelp_lsf2lspd(ctx->isp[3], ctx->isf_cur, LP_ORDER);
1182
1183 /* Generate a ISP vector for each subframe */
1184
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6268 if (ctx->first_frame) {
1185 22 ctx->first_frame = 0;
1186 22 memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(double));
1187 }
1188 6268 interpolate_isp(ctx->isp, ctx->isp_sub4_past);
1189
1190
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31340 for (sub = 0; sub < 4; sub++)
1191 25072 ff_amrwb_lsp2lpc(ctx->isp[sub], ctx->lp_coef[sub], LP_ORDER);
1192
1193
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31340 for (sub = 0; sub < 4; sub++) {
1194 25072 const AMRWBSubFrame *cur_subframe = &cf->subframe[sub];
1195 25072 float *sub_buf = buf_out + sub * AMRWB_SFR_SIZE_16k;
1196
1197 /* Decode adaptive codebook (pitch vector) */
1198 25072 decode_pitch_vector(ctx, cur_subframe, sub);
1199 /* Decode innovative codebook (fixed vector) */
1200 25072 decode_fixed_vector(ctx->fixed_vector, cur_subframe->pul_ih,
1201 25072 cur_subframe->pul_il, ctx->fr_cur_mode);
1202
1203 25072 pitch_sharpening(ctx, ctx->fixed_vector);
1204
1205 25072 decode_gains(cur_subframe->vq_gain, ctx->fr_cur_mode,
1206 &fixed_gain_factor, &ctx->pitch_gain[0]);
1207
1208 25072 ctx->fixed_gain[0] =
1209 25072 ff_amr_set_fixed_gain(fixed_gain_factor,
1210 25072 ctx->celpm_ctx.dot_productf(ctx->fixed_vector,
1211 25072 ctx->fixed_vector,
1212 AMRWB_SFR_SIZE) /
1213 AMRWB_SFR_SIZE,
1214 25072 ctx->prediction_error,
1215 ENERGY_MEAN, energy_pred_fac);
1216
1217 /* Calculate voice factor and store tilt for next subframe */
1218 25072 voice_fac = voice_factor(ctx->pitch_vector, ctx->pitch_gain[0],
1219 25072 ctx->fixed_vector, ctx->fixed_gain[0],
1220 &ctx->celpm_ctx);
1221 25072 ctx->tilt_coef = voice_fac * 0.25 + 0.25;
1222
1223 /* Construct current excitation */
1224
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1629680 for (i = 0; i < AMRWB_SFR_SIZE; i++) {
1225 1604608 ctx->excitation[i] *= ctx->pitch_gain[0];
1226 1604608 ctx->excitation[i] += ctx->fixed_gain[0] * ctx->fixed_vector[i];
1227 1604608 ctx->excitation[i] = truncf(ctx->excitation[i]);
1228 }
1229
1230 /* Post-processing of excitation elements */
1231 25072 synth_fixed_gain = noise_enhancer(ctx->fixed_gain[0], &ctx->prev_tr_gain,
1232 voice_fac, stab_fac);
1233
1234 25072 synth_fixed_vector = anti_sparseness(ctx, ctx->fixed_vector,
1235 spare_vector);
1236
1237 25072 pitch_enhancer(synth_fixed_vector, voice_fac);
1238
1239 25072 synthesis(ctx, ctx->lp_coef[sub], synth_exc, synth_fixed_gain,
1240 synth_fixed_vector, &ctx->samples_az[LP_ORDER]);
1241
1242 /* Synthesis speech post-processing */
1243 25072 de_emphasis(&ctx->samples_up[UPS_MEM_SIZE],
1244 25072 &ctx->samples_az[LP_ORDER], PREEMPH_FAC, ctx->demph_mem);
1245
1246 25072 ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(&ctx->samples_up[UPS_MEM_SIZE],
1247 25072 &ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_31_poles,
1248 25072 hpf_31_gain, ctx->hpf_31_mem, AMRWB_SFR_SIZE);
1249
1250 25072 upsample_5_4(sub_buf, &ctx->samples_up[UPS_FIR_SIZE],
1251 AMRWB_SFR_SIZE_16k, &ctx->celpm_ctx);
1252
1253 /* High frequency band (6.4 - 7.0 kHz) generation part */
1254 25072 ctx->acelpf_ctx.acelp_apply_order_2_transfer_function(hb_samples,
1255 25072 &ctx->samples_up[UPS_MEM_SIZE], hpf_zeros, hpf_400_poles,
1256 25072 hpf_400_gain, ctx->hpf_400_mem, AMRWB_SFR_SIZE);
1257
1258 25072 hb_gain = find_hb_gain(ctx, hb_samples,
1259 25072 cur_subframe->hb_gain, cf->vad);
1260
1261 25072 scaled_hb_excitation(ctx, hb_exc, synth_exc, hb_gain);
1262
1263 25072 hb_synthesis(ctx, sub, &ctx->samples_hb[LP_ORDER_16k],
1264 25072 hb_exc, ctx->isf_cur, ctx->isf_past_final);
1265
1266 /* High-band post-processing filters */
1267 25072 hb_fir_filter(hb_samples, bpf_6_7_coef, ctx->bpf_6_7_mem,
1268 25072 &ctx->samples_hb[LP_ORDER_16k]);
1269
1270
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25072 if (ctx->fr_cur_mode == MODE_23k85)
1271 8656 hb_fir_filter(hb_samples, lpf_7_coef, ctx->lpf_7_mem,
1272 hb_samples);
1273
1274 /* Add the low and high frequency bands */
1275
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2030832 for (i = 0; i < AMRWB_SFR_SIZE_16k; i++)
1276 2005760 sub_buf[i] = (sub_buf[i] + hb_samples[i]) * (1.0f / (1 << 15));
1277
1278 /* Update buffers and history */
1279 25072 update_sub_state(ctx);
1280 }
1281
1282 /* update state for next frame */
1283 6268 memcpy(ctx->isp_sub4_past, ctx->isp[3], LP_ORDER * sizeof(ctx->isp[3][0]));
1284 6268 memcpy(ctx->isf_past_final, ctx->isf_cur, LP_ORDER * sizeof(float));
1285
1286 6268 buf += expected_fr_size;
1287 6268 buf_size -= expected_fr_size;
1288 }
1289
1290 6268 *got_frame_ptr = 1;
1291
1292 6268 return avpkt->size;
1293 }
1294
1295 const FFCodec ff_amrwb_decoder = {
1296 .p.name = "amrwb",
1297 .p.long_name = NULL_IF_CONFIG_SMALL("AMR-WB (Adaptive Multi-Rate WideBand)"),
1298 .p.type = AVMEDIA_TYPE_AUDIO,
1299 .p.id = AV_CODEC_ID_AMR_WB,
1300 .priv_data_size = sizeof(AMRWBChannelsContext),
1301 .init = amrwb_decode_init,
1302 FF_CODEC_DECODE_CB(amrwb_decode_frame),
1303 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
1304 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
1305 AV_SAMPLE_FMT_NONE },
1306 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1307 };
1308