2 * Digital Speech Standard - Standard Play mode (DSS SP) audio decoder.
3 * Copyright (C) 2014 Oleksij Rempel <linux@rempel-privat.de>
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/common.h"
24 #include "libavutil/mem.h"
25 #include "libavutil/mem_internal.h"
26 #include "libavutil/opt.h"
35 #define DSS_SP_FRAME_SIZE 42
36 #define DSS_SP_SAMPLE_COUNT (66 * SUBFRAMES)
37 #define DSS_SP_FORMULA(a, b, c) ((int)((((a) * (1 << 15)) + (b) * (unsigned)(c)) + 0x4000) >> 15)
39 typedef struct DssSpSubframe {
41 int32_t combined_pulse_pos;
46 typedef struct DssSpFrame {
47 int16_t filter_idx[14];
48 int16_t sf_adaptive_gain[SUBFRAMES];
49 int16_t pitch_lag[SUBFRAMES];
50 struct DssSpSubframe sf[SUBFRAMES];
53 typedef struct DssSpContext {
54 AVCodecContext *avctx;
55 int32_t excitation[288 + 6];
58 int32_t working_buffer[SUBFRAMES][72];
59 int32_t audio_buf[15];
61 int32_t lpc_filter[14];
63 int32_t vector_buf[72];
69 DECLARE_ALIGNED(16, uint8_t, bits)[DSS_SP_FRAME_SIZE +
70 AV_INPUT_BUFFER_PADDING_SIZE];
74 * Used for the coding/decoding of the pulse positions for the MP-MLQ codebook.
76 static const uint32_t dss_sp_combinatorial_table[PULSE_MAX][72] = {
91 12, 13, 14, 15, 16, 17,
92 18, 19, 20, 21, 22, 23,
93 24, 25, 26, 27, 28, 29,
94 30, 31, 32, 33, 34, 35,
95 36, 37, 38, 39, 40, 41,
96 42, 43, 44, 45, 46, 47,
97 48, 49, 50, 51, 52, 53,
98 54, 55, 56, 57, 58, 59,
99 60, 61, 62, 63, 64, 65,
100 66, 67, 68, 69, 70, 71 },
102 15, 21, 28, 36, 45, 55,
103 66, 78, 91, 105, 120, 136,
104 153, 171, 190, 210, 231, 253,
105 276, 300, 325, 351, 378, 406,
106 435, 465, 496, 528, 561, 595,
107 630, 666, 703, 741, 780, 820,
108 861, 903, 946, 990, 1035, 1081,
109 1128, 1176, 1225, 1275, 1326, 1378,
110 1431, 1485, 1540, 1596, 1653, 1711,
111 1770, 1830, 1891, 1953, 2016, 2080,
112 2145, 2211, 2278, 2346, 2415, 2485 },
114 20, 35, 56, 84, 120, 165,
115 220, 286, 364, 455, 560, 680,
116 816, 969, 1140, 1330, 1540, 1771,
117 2024, 2300, 2600, 2925, 3276, 3654,
118 4060, 4495, 4960, 5456, 5984, 6545,
119 7140, 7770, 8436, 9139, 9880, 10660,
120 11480, 12341, 13244, 14190, 15180, 16215,
121 17296, 18424, 19600, 20825, 22100, 23426,
122 24804, 26235, 27720, 29260, 30856, 32509,
123 34220, 35990, 37820, 39711, 41664, 43680,
124 45760, 47905, 50116, 52394, 54740, 57155 },
126 15, 35, 70, 126, 210, 330,
127 495, 715, 1001, 1365, 1820, 2380,
128 3060, 3876, 4845, 5985, 7315, 8855,
129 10626, 12650, 14950, 17550, 20475, 23751,
130 27405, 31465, 35960, 40920, 46376, 52360,
131 58905, 66045, 73815, 82251, 91390, 101270,
132 111930, 123410, 135751, 148995, 163185, 178365,
133 194580, 211876, 230300, 249900, 270725, 292825,
134 316251, 341055, 367290, 395010, 424270, 455126,
135 487635, 521855, 557845, 595665, 635376, 677040,
136 720720, 766480, 814385, 864501, 916895, 971635 },
138 6, 21, 56, 126, 252, 462,
139 792, 1287, 2002, 3003, 4368, 6188,
140 8568, 11628, 15504, 20349, 26334, 33649,
141 42504, 53130, 65780, 80730, 98280, 118755,
142 142506, 169911, 201376, 237336, 278256, 324632,
143 376992, 435897, 501942, 575757, 658008, 749398,
144 850668, 962598, 1086008, 1221759, 1370754, 1533939,
145 1712304, 1906884, 2118760, 2349060, 2598960, 2869685,
146 3162510, 3478761, 3819816, 4187106, 4582116, 5006386,
147 5461512, 5949147, 6471002, 7028847, 7624512, 8259888,
148 8936928, 9657648, 10424128, 11238513, 12103014, 13019909 },
150 1, 7, 28, 84, 210, 462,
151 924, 1716, 3003, 5005, 8008, 12376,
152 18564, 27132, 38760, 54264, 74613, 100947,
153 134596, 177100, 230230, 296010, 376740, 475020,
154 593775, 736281, 906192, 1107568, 1344904, 1623160,
155 1947792, 2324784, 2760681, 3262623, 3838380, 4496388,
156 5245786, 6096454, 7059052, 8145060, 9366819, 10737573,
157 12271512, 13983816, 15890700, 18009460, 20358520, 22957480,
158 25827165, 28989675, 32468436, 36288252, 40475358, 45057474,
159 50063860, 55525372, 61474519, 67945521, 74974368, 82598880,
160 90858768, 99795696, 109453344, 119877472, 131115985, 143218999 },
162 0, 1, 8, 36, 120, 330,
163 792, 1716, 3432, 6435, 11440, 19448,
164 31824, 50388, 77520, 116280, 170544, 245157,
165 346104, 480700, 657800, 888030, 1184040, 1560780,
166 2035800, 2629575, 3365856, 4272048, 5379616, 6724520,
167 8347680, 10295472, 12620256, 15380937, 18643560, 22481940,
168 26978328, 32224114, 38320568, 45379620, 53524680, 62891499,
169 73629072, 85900584, 99884400, 115775100, 133784560, 154143080,
170 177100560, 202927725, 231917400, 264385836, 300674088, 341149446,
171 386206920, 436270780, 491796152, 553270671, 621216192, 696190560,
172 778789440, 869648208, 969443904, 1078897248, 1198774720, 1329890705 },
175 static const int16_t dss_sp_filter_cb[14][32] = {
176 { -32653, -32587, -32515, -32438, -32341, -32216, -32062, -31881,
177 -31665, -31398, -31080, -30724, -30299, -29813, -29248, -28572,
178 -27674, -26439, -24666, -22466, -19433, -16133, -12218, -7783,
179 -2834, 1819, 6544, 11260, 16050, 20220, 24774, 28120 },
181 { -27503, -24509, -20644, -17496, -14187, -11277, -8420, -5595,
182 -3013, -624, 1711, 3880, 5844, 7774, 9739, 11592,
183 13364, 14903, 16426, 17900, 19250, 20586, 21803, 23006,
184 24142, 25249, 26275, 27300, 28359, 29249, 30118, 31183 },
186 { -27827, -24208, -20943, -17781, -14843, -11848, -9066, -6297,
187 -3660, -910, 1918, 5025, 8223, 11649, 15086, 18423,
188 0, 0, 0, 0, 0, 0, 0, 0,
189 0, 0, 0, 0, 0, 0, 0, 0 },
191 { -17128, -11975, -8270, -5123, -2296, 183, 2503, 4707,
192 6798, 8945, 11045, 13239, 15528, 18248, 21115, 24785,
193 0, 0, 0, 0, 0, 0, 0, 0,
194 0, 0, 0, 0, 0, 0, 0, 0 },
196 { -21557, -17280, -14286, -11644, -9268, -7087, -4939, -2831,
197 -691, 1407, 3536, 5721, 8125, 10677, 13721, 17731,
198 0, 0, 0, 0, 0, 0, 0, 0,
199 0, 0, 0, 0, 0, 0, 0, 0 },
201 { -15030, -10377, -7034, -4327, -1900, 364, 2458, 4450,
202 6422, 8374, 10374, 12486, 14714, 16997, 19626, 22954,
203 0, 0, 0, 0, 0, 0, 0, 0,
204 0, 0, 0, 0, 0, 0, 0, 0 },
206 { -16155, -12362, -9698, -7460, -5258, -3359, -1547, 219,
207 1916, 3599, 5299, 6994, 8963, 11226, 13716, 16982,
208 0, 0, 0, 0, 0, 0, 0, 0,
209 0, 0, 0, 0, 0, 0, 0, 0 },
211 { -14742, -9848, -6921, -4648, -2769, -1065, 499, 2083,
212 3633, 5219, 6857, 8580, 10410, 12672, 15561, 20101,
213 0, 0, 0, 0, 0, 0, 0, 0,
214 0, 0, 0, 0, 0, 0, 0, 0 },
216 { -11099, -7014, -3855, -1025, 1680, 4544, 7807, 11932,
217 0, 0, 0, 0, 0, 0, 0, 0,
218 0, 0, 0, 0, 0, 0, 0, 0,
219 0, 0, 0, 0, 0, 0, 0, 0 },
221 { -9060, -4570, -1381, 1419, 4034, 6728, 9865, 14149,
222 0, 0, 0, 0, 0, 0, 0, 0,
223 0, 0, 0, 0, 0, 0, 0, 0,
224 0, 0, 0, 0, 0, 0, 0, 0 },
226 { -12450, -7985, -4596, -1734, 961, 3629, 6865, 11142,
227 0, 0, 0, 0, 0, 0, 0, 0,
228 0, 0, 0, 0, 0, 0, 0, 0,
229 0, 0, 0, 0, 0, 0, 0, 0 },
231 { -11831, -7404, -4010, -1096, 1606, 4291, 7386, 11482,
232 0, 0, 0, 0, 0, 0, 0, 0,
233 0, 0, 0, 0, 0, 0, 0, 0,
234 0, 0, 0, 0, 0, 0, 0, 0 },
236 { -13404, -9250, -5995, -3312, -890, 1594, 4464, 8198,
237 0, 0, 0, 0, 0, 0, 0, 0,
238 0, 0, 0, 0, 0, 0, 0, 0,
239 0, 0, 0, 0, 0, 0, 0, 0 },
241 { -11239, -7220, -4040, -1406, 971, 3321, 6006, 9697,
242 0, 0, 0, 0, 0, 0, 0, 0,
243 0, 0, 0, 0, 0, 0, 0, 0,
244 0, 0, 0, 0, 0, 0, 0, 0 },
247 static const uint16_t dss_sp_fixed_cb_gain[64] = {
248 0, 4, 8, 13, 17, 22, 26, 31,
249 35, 40, 44, 48, 53, 58, 63, 69,
250 76, 83, 91, 99, 109, 119, 130, 142,
251 155, 170, 185, 203, 222, 242, 265, 290,
252 317, 346, 378, 414, 452, 494, 540, 591,
253 646, 706, 771, 843, 922, 1007, 1101, 1204,
254 1316, 1438, 1572, 1719, 1879, 2053, 2244, 2453,
255 2682, 2931, 3204, 3502, 3828, 4184, 4574, 5000,
258 static const int16_t dss_sp_pulse_val[8] = {
259 -31182, -22273, -13364, -4455, 4455, 13364, 22273, 31182
262 static const uint16_t binary_decreasing_array[] = {
263 32767, 16384, 8192, 4096, 2048, 1024, 512, 256,
264 128, 64, 32, 16, 8, 4, 2,
267 static const uint16_t dss_sp_unc_decreasing_array[] = {
268 32767, 26214, 20972, 16777, 13422, 10737, 8590, 6872,
269 5498, 4398, 3518, 2815, 2252, 1801, 1441,
272 static const uint16_t dss_sp_adaptive_gain[] = {
273 102, 231, 360, 488, 617, 746, 875, 1004,
274 1133, 1261, 1390, 1519, 1648, 1777, 1905, 2034,
275 2163, 2292, 2421, 2550, 2678, 2807, 2936, 3065,
276 3194, 3323, 3451, 3580, 3709, 3838, 3967, 4096,
279 static const int32_t dss_sp_sinc[67] = {
280 262, 293, 323, 348, 356, 336, 269, 139,
281 -67, -358, -733, -1178, -1668, -2162, -2607, -2940,
282 -3090, -2986, -2562, -1760, -541, 1110, 3187, 5651,
283 8435, 11446, 14568, 17670, 20611, 23251, 25460, 27125,
285 27125, 25460, 23251, 20611, 17670, 14568, 11446, 8435,
286 5651, 3187, 1110, -541, -1760, -2562, -2986, -3090,
287 -2940, -2607, -2162, -1668, -1178, -733, -358, -67,
288 139, 269, 336, 356, 348, 323, 293, 262,
291 static av_cold int dss_sp_decode_init(AVCodecContext *avctx)
293 DssSpContext *p = avctx->priv_data;
294 avctx->channel_layout = AV_CH_LAYOUT_MONO;
295 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
297 avctx->sample_rate = 11025;
299 memset(p->history, 0, sizeof(p->history));
300 p->pulse_dec_mode = 1;
306 static void dss_sp_unpack_coeffs(DssSpContext *p, const uint8_t *src)
309 DssSpFrame *fparam = &p->fparam;
312 uint32_t combined_pitch;
316 for (i = 0; i < DSS_SP_FRAME_SIZE; i += 2) {
317 p->bits[i] = src[i + 1];
318 p->bits[i + 1] = src[i];
321 init_get_bits(&gb, p->bits, DSS_SP_FRAME_SIZE * 8);
323 for (i = 0; i < 2; i++)
324 fparam->filter_idx[i] = get_bits(&gb, 5);
326 fparam->filter_idx[i] = get_bits(&gb, 4);
328 fparam->filter_idx[i] = get_bits(&gb, 3);
330 for (subframe_idx = 0; subframe_idx < 4; subframe_idx++) {
331 fparam->sf_adaptive_gain[subframe_idx] = get_bits(&gb, 5);
333 fparam->sf[subframe_idx].combined_pulse_pos = get_bits_long(&gb, 31);
335 fparam->sf[subframe_idx].gain = get_bits(&gb, 6);
337 for (i = 0; i < 7; i++)
338 fparam->sf[subframe_idx].pulse_val[i] = get_bits(&gb, 3);
341 for (subframe_idx = 0; subframe_idx < 4; subframe_idx++) {
342 unsigned int C72_binomials[PULSE_MAX] = {
343 72, 2556, 59640, 1028790, 13991544, 156238908, 1473109704,
346 unsigned int combined_pulse_pos =
347 fparam->sf[subframe_idx].combined_pulse_pos;
350 if (combined_pulse_pos < C72_binomials[PULSE_MAX - 1]) {
351 if (p->pulse_dec_mode) {
352 int pulse, pulse_idx;
353 pulse = PULSE_MAX - 1;
356 fparam->sf[subframe_idx].combined_pulse_pos;
358 /* this part seems to be close to g723.1 gen_fcb_excitation()
361 /* TODO: what is 7? size of subframe? */
362 for (i = 0; i < 7; i++) {
365 dss_sp_combinatorial_table[pulse][pulse_idx];
368 combined_pulse_pos -=
369 dss_sp_combinatorial_table[pulse][pulse_idx];
371 fparam->sf[subframe_idx].pulse_pos[i] = pulse_idx;
375 p->pulse_dec_mode = 0;
377 /* why do we need this? */
378 fparam->sf[subframe_idx].pulse_pos[6] = 0;
380 for (i = 71; i >= 0; i--) {
381 if (C72_binomials[index] <= combined_pulse_pos) {
382 combined_pulse_pos -= C72_binomials[index];
384 fparam->sf[subframe_idx].pulse_pos[6 - index] = i;
393 for (a = 0; a < index; a++)
394 C72_binomials[a + 1] -= C72_binomials[a];
400 combined_pitch = get_bits(&gb, 24);
402 fparam->pitch_lag[0] = (combined_pitch % 151) + 36;
404 combined_pitch /= 151;
406 for (i = 1; i < SUBFRAMES - 1; i++) {
407 fparam->pitch_lag[i] = combined_pitch % 48;
408 combined_pitch /= 48;
410 if (combined_pitch > 47) {
411 av_log (p->avctx, AV_LOG_WARNING, "combined_pitch was too large\n");
414 fparam->pitch_lag[i] = combined_pitch;
416 pitch_lag = fparam->pitch_lag[0];
417 for (i = 1; i < SUBFRAMES; i++) {
418 if (pitch_lag > 162) {
419 fparam->pitch_lag[i] += 162 - 23;
421 tmp = pitch_lag - 23;
424 fparam->pitch_lag[i] += tmp;
426 pitch_lag = fparam->pitch_lag[i];
430 static void dss_sp_unpack_filter(DssSpContext *p)
434 for (i = 0; i < 14; i++)
435 p->lpc_filter[i] = dss_sp_filter_cb[i][p->fparam.filter_idx[i]];
438 static void dss_sp_convert_coeffs(int32_t *lpc_filter, int32_t *coeffs)
443 for (a = 0; a < 14; a++) {
445 coeffs[a_plus] = lpc_filter[a] >> 2;
446 if (a_plus / 2 >= 1) {
447 for (i = 1; i <= a_plus / 2; i++) {
448 int coeff_1, coeff_2, tmp;
451 coeff_2 = coeffs[a_plus - i];
453 tmp = DSS_SP_FORMULA(coeff_1, lpc_filter[a], coeff_2);
454 coeffs[i] = av_clip_int16(tmp);
456 tmp = DSS_SP_FORMULA(coeff_2, lpc_filter[a], coeff_1);
457 coeffs[a_plus - i] = av_clip_int16(tmp);
463 static void dss_sp_add_pulses(int32_t *vector_buf,
464 const struct DssSpSubframe *sf)
468 for (i = 0; i < 7; i++)
469 vector_buf[sf->pulse_pos[i]] += (dss_sp_fixed_cb_gain[sf->gain] *
470 dss_sp_pulse_val[sf->pulse_val[i]] +
474 static void dss_sp_gen_exc(int32_t *vector, int32_t *prev_exc,
475 int pitch_lag, int gain)
479 /* do we actually need this check? we can use just [a3 - i % a3]
482 for (i = 0; i < 72; i++)
483 vector[i] = prev_exc[pitch_lag - i % pitch_lag];
485 for (i = 0; i < 72; i++)
486 vector[i] = prev_exc[pitch_lag - i];
488 for (i = 0; i < 72; i++) {
489 int tmp = gain * vector[i] >> 11;
490 vector[i] = av_clip_int16(tmp);
494 static void dss_sp_scale_vector(int32_t *vec, int bits, int size)
499 for (i = 0; i < size; i++)
500 vec[i] = vec[i] >> -bits;
502 for (i = 0; i < size; i++)
503 vec[i] = vec[i] * (1 << bits);
506 static void dss_sp_update_buf(int32_t *hist, int32_t *vector)
510 for (i = 114; i > 0; i--)
511 vector[i + 72] = vector[i];
513 for (i = 0; i < 72; i++)
514 vector[72 - i] = hist[i];
517 static void dss_sp_shift_sq_sub(const int32_t *filter_buf,
518 int32_t *error_buf, int32_t *dst)
522 for (a = 0; a < 72; a++) {
525 tmp = dst[a] * filter_buf[0];
527 for (i = 14; i > 0; i--)
528 tmp -= error_buf[i] * (unsigned)filter_buf[i];
530 for (i = 14; i > 0; i--)
531 error_buf[i] = error_buf[i - 1];
533 tmp = (int)(tmp + 4096U) >> 13;
537 dst[a] = av_clip_int16(tmp);
541 static void dss_sp_shift_sq_add(const int32_t *filter_buf, int32_t *audio_buf,
546 for (a = 0; a < 72; a++) {
549 audio_buf[0] = dst[a];
551 for (i = 14; i >= 0; i--)
552 tmp += audio_buf[i] * filter_buf[i];
554 for (i = 14; i > 0; i--)
555 audio_buf[i] = audio_buf[i - 1];
557 tmp = (tmp + 4096) >> 13;
559 dst[a] = av_clip_int16(tmp);
563 static void dss_sp_vec_mult(const int32_t *src, int32_t *dst,
570 for (i = 1; i < 15; i++)
571 dst[i] = (src[i] * mult[i] + 0x4000) >> 15;
574 static int dss_sp_get_normalize_bits(int32_t *vector_buf, int16_t size)
581 for (i = 0; i < size; i++)
582 val |= FFABS(vector_buf[i]);
584 for (max_val = 0; val <= 0x4000; ++max_val)
589 static int dss_sp_vector_sum(DssSpContext *p, int size)
592 for (i = 0; i < size; i++)
593 sum += FFABS(p->vector_buf[i]);
597 static void dss_sp_sf_synthesis(DssSpContext *p, int32_t lpc_filter,
598 int32_t *dst, int size)
602 int bias, vsum_2 = 0, vsum_1 = 0, v36, normalize_bits;
606 vsum_1 = dss_sp_vector_sum(p, size);
608 if (vsum_1 > 0xFFFFF)
612 normalize_bits = dss_sp_get_normalize_bits(p->vector_buf, size);
614 dss_sp_scale_vector(p->vector_buf, normalize_bits - 3, size);
615 dss_sp_scale_vector(p->audio_buf, normalize_bits, 15);
616 dss_sp_scale_vector(p->err_buf1, normalize_bits, 15);
618 v36 = p->err_buf1[1];
620 dss_sp_vec_mult(p->filter, tmp_buf, binary_decreasing_array);
621 dss_sp_shift_sq_add(tmp_buf, p->audio_buf, p->vector_buf);
623 dss_sp_vec_mult(p->filter, tmp_buf, dss_sp_unc_decreasing_array);
624 dss_sp_shift_sq_sub(tmp_buf, p->err_buf1, p->vector_buf);
626 /* lpc_filter can be negative */
627 lpc_filter = lpc_filter >> 1;
632 for (i = size - 1; i > 0; i--) {
633 tmp = DSS_SP_FORMULA(p->vector_buf[i], lpc_filter,
634 p->vector_buf[i - 1]);
635 p->vector_buf[i] = av_clip_int16(tmp);
639 tmp = DSS_SP_FORMULA(p->vector_buf[0], lpc_filter, v36);
640 p->vector_buf[0] = av_clip_int16(tmp);
642 dss_sp_scale_vector(p->vector_buf, -normalize_bits, size);
643 dss_sp_scale_vector(p->audio_buf, -normalize_bits, 15);
644 dss_sp_scale_vector(p->err_buf1, -normalize_bits, 15);
647 vsum_2 = dss_sp_vector_sum(p, size);
650 tmp = (vsum_1 << 11) / vsum_2;
654 bias = 409 * tmp >> 15 << 15;
655 tmp = (bias + 32358 * p->noise_state) >> 15;
656 noise[0] = av_clip_int16(tmp);
658 for (i = 1; i < size; i++) {
659 tmp = (bias + 32358 * noise[i - 1]) >> 15;
660 noise[i] = av_clip_int16(tmp);
663 p->noise_state = noise[size - 1];
664 for (i = 0; i < size; i++) {
665 tmp = (p->vector_buf[i] * noise[i]) >> 11;
666 dst[i] = av_clip_int16(tmp);
670 static void dss_sp_update_state(DssSpContext *p, int32_t *dst)
672 int i, offset = 6, counter = 0, a = 0;
674 for (i = 0; i < 6; i++)
675 p->excitation[i] = p->excitation[288 + i];
677 for (i = 0; i < 72 * SUBFRAMES; i++)
678 p->excitation[6 + i] = dst[i];
683 for (i = 0; i < 6; i++)
684 tmp += p->excitation[offset--] * dss_sp_sinc[a + i * 11];
689 dst[counter] = av_clip_int16(tmp);
696 } while (offset < FF_ARRAY_ELEMS(p->excitation));
699 static void dss_sp_32to16bit(int16_t *dst, int32_t *src, int size)
703 for (i = 0; i < size; i++)
704 dst[i] = av_clip_int16(src[i]);
707 static int dss_sp_decode_one_frame(DssSpContext *p,
708 int16_t *abuf_dst, const uint8_t *abuf_src)
712 dss_sp_unpack_coeffs(p, abuf_src);
714 dss_sp_unpack_filter(p);
716 dss_sp_convert_coeffs(p->lpc_filter, p->filter);
718 for (j = 0; j < SUBFRAMES; j++) {
719 dss_sp_gen_exc(p->vector_buf, p->history,
720 p->fparam.pitch_lag[j],
721 dss_sp_adaptive_gain[p->fparam.sf_adaptive_gain[j]]);
723 dss_sp_add_pulses(p->vector_buf, &p->fparam.sf[j]);
725 dss_sp_update_buf(p->vector_buf, p->history);
727 for (i = 0; i < 72; i++)
728 p->vector_buf[i] = p->history[72 - i];
730 dss_sp_shift_sq_sub(p->filter,
731 p->err_buf2, p->vector_buf);
733 dss_sp_sf_synthesis(p, p->lpc_filter[0],
734 &p->working_buffer[j][0], 72);
737 dss_sp_update_state(p, &p->working_buffer[0][0]);
739 dss_sp_32to16bit(abuf_dst,
740 &p->working_buffer[0][0], 264);
744 static int dss_sp_decode_frame(AVCodecContext *avctx, void *data,
745 int *got_frame_ptr, AVPacket *avpkt)
747 DssSpContext *p = avctx->priv_data;
748 AVFrame *frame = data;
749 const uint8_t *buf = avpkt->data;
750 int buf_size = avpkt->size;
755 if (buf_size < DSS_SP_FRAME_SIZE) {
757 av_log(avctx, AV_LOG_WARNING,
758 "Expected %d bytes, got %d - skipping packet.\n",
759 DSS_SP_FRAME_SIZE, buf_size);
761 return AVERROR_INVALIDDATA;
764 frame->nb_samples = DSS_SP_SAMPLE_COUNT;
765 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
768 out = (int16_t *)frame->data[0];
770 dss_sp_decode_one_frame(p, out, buf);
774 return DSS_SP_FRAME_SIZE;
777 const AVCodec ff_dss_sp_decoder = {
779 .long_name = NULL_IF_CONFIG_SMALL("Digital Speech Standard - Standard Play mode (DSS SP)"),
780 .type = AVMEDIA_TYPE_AUDIO,
781 .id = AV_CODEC_ID_DSS_SP,
782 .priv_data_size = sizeof(DssSpContext),
783 .init = dss_sp_decode_init,
784 .decode = dss_sp_decode_frame,
785 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,