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1 | /* |
2 | * DSP Group TrueSpeech compatible decoder | |
3 | * Copyright (c) 2005 Konstantin Shishkov | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include "libavutil/channel_layout.h" | |
23 | #include "libavutil/intreadwrite.h" | |
24 | #include "avcodec.h" | |
25 | #include "bswapdsp.h" | |
26 | #include "get_bits.h" | |
27 | #include "internal.h" | |
28 | ||
29 | #include "truespeech_data.h" | |
30 | /** | |
31 | * @file | |
32 | * TrueSpeech decoder. | |
33 | */ | |
34 | ||
35 | /** | |
36 | * TrueSpeech decoder context | |
37 | */ | |
38 | typedef struct { | |
39 | BswapDSPContext bdsp; | |
40 | /* input data */ | |
41 | DECLARE_ALIGNED(16, uint8_t, buffer)[32]; | |
42 | int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3 | |
43 | int offset1[2]; ///< 8-bit value, used in one copying offset | |
44 | int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter | |
45 | int pulseoff[4]; ///< 4-bit offset of pulse values block | |
46 | int pulsepos[4]; ///< 27-bit variable, encodes 7 pulse positions | |
47 | int pulseval[4]; ///< 7x2-bit pulse values | |
48 | int flag; ///< 1-bit flag, shows how to choose filters | |
49 | /* temporary data */ | |
50 | int filtbuf[146]; // some big vector used for storing filters | |
51 | int prevfilt[8]; // filter from previous frame | |
52 | int16_t tmp1[8]; // coefficients for adding to out | |
53 | int16_t tmp2[8]; // coefficients for adding to out | |
54 | int16_t tmp3[8]; // coefficients for adding to out | |
55 | int16_t cvector[8]; // correlated input vector | |
56 | int filtval; // gain value for one function | |
57 | int16_t newvec[60]; // tmp vector | |
58 | int16_t filters[32]; // filters for every subframe | |
59 | } TSContext; | |
60 | ||
61 | static av_cold int truespeech_decode_init(AVCodecContext * avctx) | |
62 | { | |
63 | TSContext *c = avctx->priv_data; | |
64 | ||
65 | if (avctx->channels != 1) { | |
66 | avpriv_request_sample(avctx, "Channel count %d", avctx->channels); | |
67 | return AVERROR_PATCHWELCOME; | |
68 | } | |
69 | ||
70 | avctx->channel_layout = AV_CH_LAYOUT_MONO; | |
71 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
72 | ||
73 | ff_bswapdsp_init(&c->bdsp); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static void truespeech_read_frame(TSContext *dec, const uint8_t *input) | |
79 | { | |
80 | GetBitContext gb; | |
81 | ||
82 | dec->bdsp.bswap_buf((uint32_t *) dec->buffer, (const uint32_t *) input, 8); | |
83 | init_get_bits(&gb, dec->buffer, 32 * 8); | |
84 | ||
85 | dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)]; | |
86 | dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)]; | |
87 | dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)]; | |
88 | dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)]; | |
89 | dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)]; | |
90 | dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)]; | |
91 | dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)]; | |
92 | dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)]; | |
93 | dec->flag = get_bits1(&gb); | |
94 | ||
95 | dec->offset1[0] = get_bits(&gb, 4) << 4; | |
96 | dec->offset2[3] = get_bits(&gb, 7); | |
97 | dec->offset2[2] = get_bits(&gb, 7); | |
98 | dec->offset2[1] = get_bits(&gb, 7); | |
99 | dec->offset2[0] = get_bits(&gb, 7); | |
100 | ||
101 | dec->offset1[1] = get_bits(&gb, 4); | |
102 | dec->pulseval[1] = get_bits(&gb, 14); | |
103 | dec->pulseval[0] = get_bits(&gb, 14); | |
104 | ||
105 | dec->offset1[1] |= get_bits(&gb, 4) << 4; | |
106 | dec->pulseval[3] = get_bits(&gb, 14); | |
107 | dec->pulseval[2] = get_bits(&gb, 14); | |
108 | ||
109 | dec->offset1[0] |= get_bits1(&gb); | |
110 | dec->pulsepos[0] = get_bits_long(&gb, 27); | |
111 | dec->pulseoff[0] = get_bits(&gb, 4); | |
112 | ||
113 | dec->offset1[0] |= get_bits1(&gb) << 1; | |
114 | dec->pulsepos[1] = get_bits_long(&gb, 27); | |
115 | dec->pulseoff[1] = get_bits(&gb, 4); | |
116 | ||
117 | dec->offset1[0] |= get_bits1(&gb) << 2; | |
118 | dec->pulsepos[2] = get_bits_long(&gb, 27); | |
119 | dec->pulseoff[2] = get_bits(&gb, 4); | |
120 | ||
121 | dec->offset1[0] |= get_bits1(&gb) << 3; | |
122 | dec->pulsepos[3] = get_bits_long(&gb, 27); | |
123 | dec->pulseoff[3] = get_bits(&gb, 4); | |
124 | } | |
125 | ||
126 | static void truespeech_correlate_filter(TSContext *dec) | |
127 | { | |
128 | int16_t tmp[8]; | |
129 | int i, j; | |
130 | ||
131 | for(i = 0; i < 8; i++){ | |
132 | if(i > 0){ | |
133 | memcpy(tmp, dec->cvector, i * sizeof(*tmp)); | |
134 | for(j = 0; j < i; j++) | |
135 | dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) + | |
136 | (dec->cvector[j] << 15) + 0x4000) >> 15; | |
137 | } | |
138 | dec->cvector[i] = (8 - dec->vector[i]) >> 3; | |
139 | } | |
140 | for(i = 0; i < 8; i++) | |
141 | dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15; | |
142 | ||
143 | dec->filtval = dec->vector[0]; | |
144 | } | |
145 | ||
146 | static void truespeech_filters_merge(TSContext *dec) | |
147 | { | |
148 | int i; | |
149 | ||
150 | if(!dec->flag){ | |
151 | for(i = 0; i < 8; i++){ | |
152 | dec->filters[i + 0] = dec->prevfilt[i]; | |
153 | dec->filters[i + 8] = dec->prevfilt[i]; | |
154 | } | |
155 | }else{ | |
156 | for(i = 0; i < 8; i++){ | |
157 | dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15; | |
158 | dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15; | |
159 | } | |
160 | } | |
161 | for(i = 0; i < 8; i++){ | |
162 | dec->filters[i + 16] = dec->cvector[i]; | |
163 | dec->filters[i + 24] = dec->cvector[i]; | |
164 | } | |
165 | } | |
166 | ||
167 | static void truespeech_apply_twopoint_filter(TSContext *dec, int quart) | |
168 | { | |
169 | int16_t tmp[146 + 60], *ptr0, *ptr1; | |
170 | const int16_t *filter; | |
171 | int i, t, off; | |
172 | ||
173 | t = dec->offset2[quart]; | |
174 | if(t == 127){ | |
175 | memset(dec->newvec, 0, 60 * sizeof(*dec->newvec)); | |
176 | return; | |
177 | } | |
178 | for(i = 0; i < 146; i++) | |
179 | tmp[i] = dec->filtbuf[i]; | |
180 | off = (t / 25) + dec->offset1[quart >> 1] + 18; | |
181 | off = av_clip(off, 0, 145); | |
182 | ptr0 = tmp + 145 - off; | |
183 | ptr1 = tmp + 146; | |
184 | filter = 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 = 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 = 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 | AVFrame *frame = data; | |
310 | const uint8_t *buf = avpkt->data; | |
311 | int buf_size = avpkt->size; | |
312 | TSContext *c = avctx->priv_data; | |
313 | ||
314 | int i, j; | |
315 | int16_t *samples; | |
316 | int iterations, ret; | |
317 | ||
318 | iterations = buf_size / 32; | |
319 | ||
320 | if (!iterations) { | |
321 | av_log(avctx, AV_LOG_ERROR, | |
322 | "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size); | |
323 | return -1; | |
324 | } | |
325 | ||
326 | /* get output buffer */ | |
327 | frame->nb_samples = iterations * 240; | |
328 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
329 | return ret; | |
330 | samples = (int16_t *)frame->data[0]; | |
331 | ||
332 | memset(samples, 0, iterations * 240 * sizeof(*samples)); | |
333 | ||
334 | for(j = 0; j < iterations; j++) { | |
335 | truespeech_read_frame(c, buf); | |
336 | buf += 32; | |
337 | ||
338 | truespeech_correlate_filter(c); | |
339 | truespeech_filters_merge(c); | |
340 | ||
341 | for(i = 0; i < 4; i++) { | |
342 | truespeech_apply_twopoint_filter(c, i); | |
343 | truespeech_place_pulses (c, samples, i); | |
344 | truespeech_update_filters(c, samples, i); | |
345 | truespeech_synth (c, samples, i); | |
346 | samples += 60; | |
347 | } | |
348 | ||
349 | truespeech_save_prevvec(c); | |
350 | } | |
351 | ||
352 | *got_frame_ptr = 1; | |
353 | ||
354 | return buf_size; | |
355 | } | |
356 | ||
357 | AVCodec ff_truespeech_decoder = { | |
358 | .name = "truespeech", | |
359 | .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"), | |
360 | .type = AVMEDIA_TYPE_AUDIO, | |
361 | .id = AV_CODEC_ID_TRUESPEECH, | |
362 | .priv_data_size = sizeof(TSContext), | |
363 | .init = truespeech_decode_init, | |
364 | .decode = truespeech_decode_frame, | |
365 | .capabilities = CODEC_CAP_DR1, | |
366 | }; |