2 * DSP Group TrueSpeech compatible decoder
3 * Copyright (c) 2005 Konstantin Shishkov
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
23 #include "truespeech_data.h"
30 * TrueSpeech decoder context
34 int16_t vector[8]; //< input vector: 5/5/4/4/4/3/3/3
35 int offset1[2]; //< 8-bit value, used in one copying offset
36 int offset2[4]; //< 7-bit value, encodes offsets for copying and for two-point filter
37 int pulseoff[4]; //< 4-bit offset of pulse values block
38 int pulsepos[4]; //< 27-bit variable, encodes 7 pulse positions
39 int pulseval[4]; //< 7x2-bit pulse values
40 int flag; //< 1-bit flag, shows how to choose filters
42 int filtbuf[146]; // some big vector used for storing filters
43 int prevfilt[8]; // filter from previous frame
44 int16_t tmp1[8]; // coefficients for adding to out
45 int16_t tmp2[8]; // coefficients for adding to out
46 int16_t tmp3[8]; // coefficients for adding to out
47 int16_t cvector[8]; // correlated input vector
48 int filtval; // gain value for one function
49 int16_t newvec[60]; // tmp vector
50 int16_t filters[32]; // filters for every subframe
53 static av_cold int truespeech_decode_init(AVCodecContext * avctx)
55 // TSContext *c = avctx->priv_data;
60 static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
70 dec->vector[0] = ts_codebook[0][(t >> 1) & 0x1F];
71 dec->vector[1] = ts_codebook[1][(t >> 6) & 0x1F];
72 dec->vector[2] = ts_codebook[2][(t >> 11) & 0xF];
73 dec->vector[3] = ts_codebook[3][(t >> 15) & 0xF];
74 dec->vector[4] = ts_codebook[4][(t >> 19) & 0xF];
75 dec->vector[5] = ts_codebook[5][(t >> 23) & 0x7];
76 dec->vector[6] = ts_codebook[6][(t >> 26) & 0x7];
77 dec->vector[7] = ts_codebook[7][(t >> 29) & 0x7];
83 dec->offset2[0] = (t >> 0) & 0x7F;
84 dec->offset2[1] = (t >> 7) & 0x7F;
85 dec->offset2[2] = (t >> 14) & 0x7F;
86 dec->offset2[3] = (t >> 21) & 0x7F;
88 dec->offset1[0] = ((t >> 28) & 0xF) << 4;
94 dec->pulseval[0] = (t >> 0) & 0x3FFF;
95 dec->pulseval[1] = (t >> 14) & 0x3FFF;
97 dec->offset1[1] = (t >> 28) & 0x0F;
103 dec->pulseval[2] = (t >> 0) & 0x3FFF;
104 dec->pulseval[3] = (t >> 14) & 0x3FFF;
106 dec->offset1[1] |= ((t >> 28) & 0x0F) << 4;
112 dec->pulsepos[0] = (t >> 4) & 0x7FFFFFF;
114 dec->pulseoff[0] = (t >> 0) & 0xF;
116 dec->offset1[0] |= (t >> 31) & 1;
122 dec->pulsepos[1] = (t >> 4) & 0x7FFFFFF;
124 dec->pulseoff[1] = (t >> 0) & 0xF;
126 dec->offset1[0] |= ((t >> 31) & 1) << 1;
132 dec->pulsepos[2] = (t >> 4) & 0x7FFFFFF;
134 dec->pulseoff[2] = (t >> 0) & 0xF;
136 dec->offset1[0] |= ((t >> 31) & 1) << 2;
142 dec->pulsepos[3] = (t >> 4) & 0x7FFFFFF;
144 dec->pulseoff[3] = (t >> 0) & 0xF;
146 dec->offset1[0] |= ((t >> 31) & 1) << 3;
150 static void truespeech_correlate_filter(TSContext *dec)
155 for(i = 0; i < 8; i++){
157 memcpy(tmp, dec->cvector, i * 2);
158 for(j = 0; j < i; j++)
159 dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
160 (dec->cvector[j] << 15) + 0x4000) >> 15;
162 dec->cvector[i] = (8 - dec->vector[i]) >> 3;
164 for(i = 0; i < 8; i++)
165 dec->cvector[i] = (dec->cvector[i] * ts_230[i]) >> 15;
167 dec->filtval = dec->vector[0];
170 static void truespeech_filters_merge(TSContext *dec)
175 for(i = 0; i < 8; i++){
176 dec->filters[i + 0] = dec->prevfilt[i];
177 dec->filters[i + 8] = dec->prevfilt[i];
180 for(i = 0; i < 8; i++){
181 dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
182 dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
185 for(i = 0; i < 8; i++){
186 dec->filters[i + 16] = dec->cvector[i];
187 dec->filters[i + 24] = dec->cvector[i];
191 static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
193 int16_t tmp[146 + 60], *ptr0, *ptr1;
194 const int16_t *filter;
197 t = dec->offset2[quart];
199 memset(dec->newvec, 0, 60 * 2);
202 for(i = 0; i < 146; i++)
203 tmp[i] = dec->filtbuf[i];
204 off = (t / 25) + dec->offset1[quart >> 1] + 18;
205 ptr0 = tmp + 145 - off;
207 filter = (const int16_t*)ts_240 + (t % 25) * 2;
208 for(i = 0; i < 60; i++){
209 t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
216 static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
224 memset(out, 0, 60 * 2);
225 for(i = 0; i < 7; i++) {
226 t = dec->pulseval[quart] & 3;
227 dec->pulseval[quart] >>= 2;
228 tmp[6 - i] = ts_562[dec->pulseoff[quart] * 4 + t];
231 coef = dec->pulsepos[quart] >> 15;
232 ptr1 = (const int16_t*)ts_140 + 30;
234 for(i = 0, j = 3; (i < 30) && (j > 0); i++){
244 coef = dec->pulsepos[quart] & 0x7FFF;
245 ptr1 = (const int16_t*)ts_140;
246 for(i = 30, j = 4; (i < 60) && (j > 0); i++){
259 static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
263 for(i = 0; i < 86; i++)
264 dec->filtbuf[i] = dec->filtbuf[i + 60];
265 for(i = 0; i < 60; i++){
266 dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
267 out[i] += dec->newvec[i];
271 static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
275 int16_t *ptr0, *ptr1;
278 ptr1 = dec->filters + quart * 8;
279 for(i = 0; i < 60; i++){
281 for(k = 0; k < 8; k++)
282 sum += ptr0[k] * ptr1[k];
283 sum = (sum + (out[i] << 12) + 0x800) >> 12;
284 out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
285 for(k = 7; k > 0; k--)
286 ptr0[k] = ptr0[k - 1];
290 for(i = 0; i < 8; i++)
291 t[i] = (ts_5E2[i] * ptr1[i]) >> 15;
294 for(i = 0; i < 60; i++){
296 for(k = 0; k < 8; k++)
297 sum += ptr0[k] * t[k];
298 for(k = 7; k > 0; k--)
299 ptr0[k] = ptr0[k - 1];
301 out[i] = ((out[i] << 12) - sum) >> 12;
304 for(i = 0; i < 8; i++)
305 t[i] = (ts_5F2[i] * ptr1[i]) >> 15;
308 for(i = 0; i < 60; i++){
309 int sum = out[i] << 12;
310 for(k = 0; k < 8; k++)
311 sum += ptr0[k] * t[k];
312 for(k = 7; k > 0; k--)
313 ptr0[k] = ptr0[k - 1];
314 ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
316 sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
317 sum = sum - (sum >> 3);
318 out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
322 static void truespeech_save_prevvec(TSContext *c)
326 for(i = 0; i < 8; i++)
327 c->prevfilt[i] = c->cvector[i];
330 static int truespeech_decode_frame(AVCodecContext *avctx,
331 void *data, int *data_size,
332 const uint8_t *buf, int buf_size)
334 TSContext *c = avctx->priv_data;
337 short *samples = data;
339 int16_t out_buf[240];
345 iterations = FFMIN(buf_size / 32, *data_size / 480);
346 for(j = 0; j < iterations; j++) {
347 truespeech_read_frame(c, buf + consumed);
350 truespeech_correlate_filter(c);
351 truespeech_filters_merge(c);
353 memset(out_buf, 0, 240 * 2);
354 for(i = 0; i < 4; i++) {
355 truespeech_apply_twopoint_filter(c, i);
356 truespeech_place_pulses(c, out_buf + i * 60, i);
357 truespeech_update_filters(c, out_buf + i * 60, i);
358 truespeech_synth(c, out_buf + i * 60, i);
361 truespeech_save_prevvec(c);
363 /* finally output decoded frame */
364 for(i = 0; i < 240; i++)
365 *samples++ = out_buf[i];
369 *data_size = consumed * 15;
374 AVCodec truespeech_decoder = {
379 truespeech_decode_init,
382 truespeech_decode_frame,
383 .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),