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