524884ddf54a17a08fc4df20b233bdeddb8df2b7
[libav.git] / libavcodec / truespeech.c
1 /*
2 * DSP Group TrueSpeech compatible decoder
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/intreadwrite.h"
23 #include "avcodec.h"
24 #include "dsputil.h"
25 #include "get_bits.h"
26
27 #include "truespeech_data.h"
28 /**
29 * @file
30 * TrueSpeech decoder.
31 */
32
33 /**
34 * TrueSpeech decoder context
35 */
36 typedef struct {
37 AVFrame frame;
38 DSPContext dsp;
39 /* input data */
40 uint8_t buffer[32];
41 int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3
42 int offset1[2]; ///< 8-bit value, used in one copying offset
43 int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter
44 int pulseoff[4]; ///< 4-bit offset of pulse values block
45 int pulsepos[4]; ///< 27-bit variable, encodes 7 pulse positions
46 int pulseval[4]; ///< 7x2-bit pulse values
47 int flag; ///< 1-bit flag, shows how to choose filters
48 /* temporary data */
49 int filtbuf[146]; // some big vector used for storing filters
50 int prevfilt[8]; // filter from previous frame
51 int16_t tmp1[8]; // coefficients for adding to out
52 int16_t tmp2[8]; // coefficients for adding to out
53 int16_t tmp3[8]; // coefficients for adding to out
54 int16_t cvector[8]; // correlated input vector
55 int filtval; // gain value for one function
56 int16_t newvec[60]; // tmp vector
57 int16_t filters[32]; // filters for every subframe
58 } TSContext;
59
60 static av_cold int truespeech_decode_init(AVCodecContext * avctx)
61 {
62 TSContext *c = avctx->priv_data;
63
64 if (avctx->channels != 1) {
65 av_log_ask_for_sample(avctx, "Unsupported channel count: %d\n", avctx->channels);
66 return AVERROR(EINVAL);
67 }
68
69 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
70
71 dsputil_init(&c->dsp, avctx);
72
73 avcodec_get_frame_defaults(&c->frame);
74 avctx->coded_frame = &c->frame;
75
76 return 0;
77 }
78
79 static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
80 {
81 GetBitContext gb;
82
83 dec->dsp.bswap_buf((uint32_t *)dec->buffer, (const uint32_t *)input, 8);
84 init_get_bits(&gb, dec->buffer, 32 * 8);
85
86 dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
87 dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
88 dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
89 dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
90 dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
91 dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
92 dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
93 dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
94 dec->flag = get_bits1(&gb);
95
96 dec->offset1[0] = get_bits(&gb, 4) << 4;
97 dec->offset2[3] = get_bits(&gb, 7);
98 dec->offset2[2] = get_bits(&gb, 7);
99 dec->offset2[1] = get_bits(&gb, 7);
100 dec->offset2[0] = get_bits(&gb, 7);
101
102 dec->offset1[1] = get_bits(&gb, 4);
103 dec->pulseval[1] = get_bits(&gb, 14);
104 dec->pulseval[0] = get_bits(&gb, 14);
105
106 dec->offset1[1] |= get_bits(&gb, 4) << 4;
107 dec->pulseval[3] = get_bits(&gb, 14);
108 dec->pulseval[2] = get_bits(&gb, 14);
109
110 dec->offset1[0] |= get_bits1(&gb);
111 dec->pulsepos[0] = get_bits_long(&gb, 27);
112 dec->pulseoff[0] = get_bits(&gb, 4);
113
114 dec->offset1[0] |= get_bits1(&gb) << 1;
115 dec->pulsepos[1] = get_bits_long(&gb, 27);
116 dec->pulseoff[1] = get_bits(&gb, 4);
117
118 dec->offset1[0] |= get_bits1(&gb) << 2;
119 dec->pulsepos[2] = get_bits_long(&gb, 27);
120 dec->pulseoff[2] = get_bits(&gb, 4);
121
122 dec->offset1[0] |= get_bits1(&gb) << 3;
123 dec->pulsepos[3] = get_bits_long(&gb, 27);
124 dec->pulseoff[3] = get_bits(&gb, 4);
125 }
126
127 static void truespeech_correlate_filter(TSContext *dec)
128 {
129 int16_t tmp[8];
130 int i, j;
131
132 for(i = 0; i < 8; i++){
133 if(i > 0){
134 memcpy(tmp, dec->cvector, i * sizeof(*tmp));
135 for(j = 0; j < i; j++)
136 dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
137 (dec->cvector[j] << 15) + 0x4000) >> 15;
138 }
139 dec->cvector[i] = (8 - dec->vector[i]) >> 3;
140 }
141 for(i = 0; i < 8; i++)
142 dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
143
144 dec->filtval = dec->vector[0];
145 }
146
147 static void truespeech_filters_merge(TSContext *dec)
148 {
149 int i;
150
151 if(!dec->flag){
152 for(i = 0; i < 8; i++){
153 dec->filters[i + 0] = dec->prevfilt[i];
154 dec->filters[i + 8] = dec->prevfilt[i];
155 }
156 }else{
157 for(i = 0; i < 8; i++){
158 dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
159 dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
160 }
161 }
162 for(i = 0; i < 8; i++){
163 dec->filters[i + 16] = dec->cvector[i];
164 dec->filters[i + 24] = dec->cvector[i];
165 }
166 }
167
168 static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
169 {
170 int16_t tmp[146 + 60], *ptr0, *ptr1;
171 const int16_t *filter;
172 int i, t, off;
173
174 t = dec->offset2[quart];
175 if(t == 127){
176 memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
177 return;
178 }
179 for(i = 0; i < 146; i++)
180 tmp[i] = dec->filtbuf[i];
181 off = (t / 25) + dec->offset1[quart >> 1] + 18;
182 ptr0 = tmp + 145 - off;
183 ptr1 = tmp + 146;
184 filter = (const int16_t*)ts_order2_coeffs + (t % 25) * 2;
185 for(i = 0; i < 60; i++){
186 t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
187 ptr0++;
188 dec->newvec[i] = t;
189 ptr1[i] = t;
190 }
191 }
192
193 static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
194 {
195 int16_t tmp[7];
196 int i, j, t;
197 const int16_t *ptr1;
198 int16_t *ptr2;
199 int coef;
200
201 memset(out, 0, 60 * sizeof(*out));
202 for(i = 0; i < 7; i++) {
203 t = dec->pulseval[quart] & 3;
204 dec->pulseval[quart] >>= 2;
205 tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
206 }
207
208 coef = dec->pulsepos[quart] >> 15;
209 ptr1 = (const int16_t*)ts_pulse_values + 30;
210 ptr2 = tmp;
211 for(i = 0, j = 3; (i < 30) && (j > 0); i++){
212 t = *ptr1++;
213 if(coef >= t)
214 coef -= t;
215 else{
216 out[i] = *ptr2++;
217 ptr1 += 30;
218 j--;
219 }
220 }
221 coef = dec->pulsepos[quart] & 0x7FFF;
222 ptr1 = (const int16_t*)ts_pulse_values;
223 for(i = 30, j = 4; (i < 60) && (j > 0); i++){
224 t = *ptr1++;
225 if(coef >= t)
226 coef -= t;
227 else{
228 out[i] = *ptr2++;
229 ptr1 += 30;
230 j--;
231 }
232 }
233
234 }
235
236 static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
237 {
238 int i;
239
240 memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
241 for(i = 0; i < 60; i++){
242 dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
243 out[i] += dec->newvec[i];
244 }
245 }
246
247 static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
248 {
249 int i,k;
250 int t[8];
251 int16_t *ptr0, *ptr1;
252
253 ptr0 = dec->tmp1;
254 ptr1 = dec->filters + quart * 8;
255 for(i = 0; i < 60; i++){
256 int sum = 0;
257 for(k = 0; k < 8; k++)
258 sum += ptr0[k] * ptr1[k];
259 sum = (sum + (out[i] << 12) + 0x800) >> 12;
260 out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
261 for(k = 7; k > 0; k--)
262 ptr0[k] = ptr0[k - 1];
263 ptr0[0] = out[i];
264 }
265
266 for(i = 0; i < 8; i++)
267 t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
268
269 ptr0 = dec->tmp2;
270 for(i = 0; i < 60; i++){
271 int sum = 0;
272 for(k = 0; k < 8; k++)
273 sum += ptr0[k] * t[k];
274 for(k = 7; k > 0; k--)
275 ptr0[k] = ptr0[k - 1];
276 ptr0[0] = out[i];
277 out[i] = ((out[i] << 12) - sum) >> 12;
278 }
279
280 for(i = 0; i < 8; i++)
281 t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
282
283 ptr0 = dec->tmp3;
284 for(i = 0; i < 60; i++){
285 int sum = out[i] << 12;
286 for(k = 0; k < 8; k++)
287 sum += ptr0[k] * t[k];
288 for(k = 7; k > 0; k--)
289 ptr0[k] = ptr0[k - 1];
290 ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
291
292 sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
293 sum = sum - (sum >> 3);
294 out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
295 }
296 }
297
298 static void truespeech_save_prevvec(TSContext *c)
299 {
300 int i;
301
302 for(i = 0; i < 8; i++)
303 c->prevfilt[i] = c->cvector[i];
304 }
305
306 static int truespeech_decode_frame(AVCodecContext *avctx, void *data,
307 int *got_frame_ptr, AVPacket *avpkt)
308 {
309 const uint8_t *buf = avpkt->data;
310 int buf_size = avpkt->size;
311 TSContext *c = avctx->priv_data;
312
313 int i, j;
314 int16_t *samples;
315 int iterations, ret;
316
317 iterations = buf_size / 32;
318
319 if (!iterations) {
320 av_log(avctx, AV_LOG_ERROR,
321 "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
322 return -1;
323 }
324
325 /* get output buffer */
326 c->frame.nb_samples = iterations * 240;
327 if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
328 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
329 return ret;
330 }
331 samples = (int16_t *)c->frame.data[0];
332
333 memset(samples, 0, iterations * 240 * sizeof(*samples));
334
335 for(j = 0; j < iterations; j++) {
336 truespeech_read_frame(c, buf);
337 buf += 32;
338
339 truespeech_correlate_filter(c);
340 truespeech_filters_merge(c);
341
342 for(i = 0; i < 4; i++) {
343 truespeech_apply_twopoint_filter(c, i);
344 truespeech_place_pulses (c, samples, i);
345 truespeech_update_filters(c, samples, i);
346 truespeech_synth (c, samples, i);
347 samples += 60;
348 }
349
350 truespeech_save_prevvec(c);
351 }
352
353 *got_frame_ptr = 1;
354 *(AVFrame *)data = c->frame;
355
356 return buf_size;
357 }
358
359 AVCodec ff_truespeech_decoder = {
360 .name = "truespeech",
361 .type = AVMEDIA_TYPE_AUDIO,
362 .id = CODEC_ID_TRUESPEECH,
363 .priv_data_size = sizeof(TSContext),
364 .init = truespeech_decode_init,
365 .decode = truespeech_decode_frame,
366 .capabilities = CODEC_CAP_DR1,
367 .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
368 };