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 int truespeech_decode_init(AVCodecContext * avctx)
55
// TSContext *c = avctx->priv_data;
60
static void truespeech_read_frame(TSContext *dec, 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
uint8_t *buf, int buf_size)
334
TSContext *c = avctx->priv_data;
337
short *samples = data;
339
int16_t out_buf[240];
344
while (consumed < buf_size) {
345
truespeech_read_frame(c, buf + consumed);
348
truespeech_correlate_filter(c);
349
truespeech_filters_merge(c);
351
memset(out_buf, 0, 240 * 2);
352
for(i = 0; i < 4; i++) {
353
truespeech_apply_twopoint_filter(c, i);
354
truespeech_place_pulses(c, out_buf + i * 60, i);
355
truespeech_update_filters(c, out_buf + i * 60, i);
356
truespeech_synth(c, out_buf + i * 60, i);
359
truespeech_save_prevvec(c);
361
/* finally output decoded frame */
362
for(i = 0; i < 240; i++)
363
*samples++ = out_buf[i];
367
*data_size = consumed * 15;
372
AVCodec truespeech_decoder = {
377
truespeech_decode_init,
380
truespeech_decode_frame,