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1 | /* |
2 | * Voxware MetaSound decoder | |
3 | * Copyright (c) 2013 Konstantin Shishkov | |
4 | * based on TwinVQ decoder | |
5 | * Copyright (c) 2009 Vitor Sessak | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | #include <inttypes.h> | |
25 | #include <math.h> | |
26 | #include <stdint.h> | |
27 | ||
28 | #define BITSTREAM_READER_LE | |
29 | #include "libavutil/channel_layout.h" | |
30 | #include "libavutil/float_dsp.h" | |
31 | #include "avcodec.h" | |
32 | #include "get_bits.h" | |
33 | #include "fft.h" | |
34 | #include "internal.h" | |
35 | #include "lsp.h" | |
36 | #include "sinewin.h" | |
37 | ||
38 | #include "twinvq.h" | |
39 | #include "metasound_data.h" | |
40 | ||
41 | static void add_peak(float period, int width, const float *shape, | |
42 | float ppc_gain, float *speech, int len) | |
43 | { | |
44 | int i, j, center; | |
45 | const float *shape_end = shape + len; | |
46 | ||
47 | // First peak centered around zero | |
48 | for (i = 0; i < width / 2; i++) | |
49 | speech[i] += ppc_gain * *shape++; | |
50 | ||
51 | for (i = 1; i < ROUNDED_DIV(len, width); i++) { | |
52 | center = (int)(i * period + 0.5); | |
53 | for (j = -width / 2; j < (width + 1) / 2; j++) | |
54 | speech[j + center] += ppc_gain * *shape++; | |
55 | } | |
56 | ||
57 | // For the last block, be careful not to go beyond the end of the buffer | |
58 | center = (int)(i * period + 0.5); | |
59 | for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++) | |
60 | speech[j + center] += ppc_gain * *shape++; | |
61 | } | |
62 | ||
63 | static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef, | |
64 | const float *shape, float *speech) | |
65 | { | |
66 | const TwinVQModeTab *mtab = tctx->mtab; | |
67 | int isampf = tctx->avctx->sample_rate / 1000; | |
68 | int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels); | |
69 | int width; | |
70 | ||
71 | float ratio = (float)mtab->size / isampf; | |
72 | float min_period, max_period, period_range, period; | |
73 | float some_mult; | |
74 | ||
75 | float pgain_base, pgain_step, ppc_gain; | |
76 | ||
77 | if (tctx->avctx->channels == 1) { | |
78 | min_period = log2(ratio * 0.2); | |
79 | max_period = min_period + log2(6); | |
80 | } else { | |
81 | min_period = (int)(ratio * 0.2 * 400 + 0.5) / 400.0; | |
82 | max_period = (int)(ratio * 0.2 * 400 * 6 + 0.5) / 400.0; | |
83 | } | |
84 | period_range = max_period - min_period; | |
85 | period = min_period + period_coef * period_range / | |
86 | ((1 << mtab->ppc_period_bit) - 1); | |
87 | if (tctx->avctx->channels == 1) | |
88 | period = powf(2.0, period); | |
89 | else | |
90 | period = (int)(period * 400 + 0.5) / 400.0; | |
91 | ||
92 | switch (isampf) { | |
93 | case 8: some_mult = 2.0; break; | |
94 | case 11: some_mult = 3.0; break; | |
95 | case 16: some_mult = 3.0; break; | |
96 | case 22: some_mult = ibps == 32 ? 2.0 : 4.0; break; | |
97 | case 44: some_mult = 8.0; break; | |
98 | default: some_mult = 4.0; | |
99 | } | |
100 | ||
101 | width = (int)(some_mult / (mtab->size / period) * mtab->ppc_shape_len); | |
102 | if (isampf == 22 && ibps == 32) | |
103 | width = (int)((2.0 / period + 1) * width + 0.5); | |
104 | ||
105 | pgain_base = tctx->avctx->channels == 2 ? 25000.0 : 20000.0; | |
106 | pgain_step = pgain_base / ((1 << mtab->pgain_bit) - 1); | |
107 | ppc_gain = 1.0 / 8192 * | |
108 | twinvq_mulawinv(pgain_step * g_coef + pgain_step / 2, | |
109 | pgain_base, TWINVQ_PGAIN_MU); | |
110 | ||
111 | add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len); | |
112 | } | |
113 | ||
114 | static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist, | |
115 | int ch, float *out, float gain, | |
116 | enum TwinVQFrameType ftype) | |
117 | { | |
118 | const TwinVQModeTab *mtab = tctx->mtab; | |
119 | int i, j; | |
120 | float *hist = tctx->bark_hist[ftype][ch]; | |
121 | float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype]; | |
122 | int bark_n_coef = mtab->fmode[ftype].bark_n_coef; | |
123 | int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef; | |
124 | int idx = 0; | |
125 | ||
126 | if (tctx->avctx->channels == 1) | |
127 | val = 0.5; | |
128 | for (i = 0; i < fw_cb_len; i++) | |
129 | for (j = 0; j < bark_n_coef; j++, idx++) { | |
130 | float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] * | |
131 | (1.0 / 2048); | |
132 | float st; | |
133 | ||
134 | if (tctx->avctx->channels == 1) | |
135 | st = use_hist ? | |
136 | tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0; | |
137 | else | |
138 | st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0 | |
139 | : tmp2 + 1.0; | |
140 | ||
141 | hist[idx] = tmp2; | |
142 | if (st < 0.1) | |
143 | st = 0.1; | |
144 | ||
145 | twinvq_memset_float(out, st * gain, | |
146 | mtab->fmode[ftype].bark_tab[idx]); | |
147 | out += mtab->fmode[ftype].bark_tab[idx]; | |
148 | } | |
149 | } | |
150 | ||
151 | static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb, | |
152 | uint8_t *dst, enum TwinVQFrameType ftype) | |
153 | { | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < tctx->n_div[ftype]; i++) { | |
157 | int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]); | |
158 | ||
159 | *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]); | |
160 | *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]); | |
161 | } | |
162 | } | |
163 | ||
164 | static int metasound_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, | |
165 | const uint8_t *buf, int buf_size) | |
166 | { | |
167 | TwinVQFrameData *bits; | |
168 | const TwinVQModeTab *mtab = tctx->mtab; | |
169 | int channels = tctx->avctx->channels; | |
170 | int sub; | |
171 | GetBitContext gb; | |
172 | int i, j, k; | |
173 | ||
174 | init_get_bits(&gb, buf, buf_size * 8); | |
175 | ||
176 | for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet; | |
177 | tctx->cur_frame++) { | |
178 | bits = tctx->bits + tctx->cur_frame; | |
179 | ||
180 | bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); | |
181 | ||
182 | if (bits->window_type > 8) { | |
183 | av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); | |
184 | return AVERROR_INVALIDDATA; | |
185 | } | |
186 | ||
187 | bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[tctx->cur_frame].window_type]; | |
188 | ||
189 | sub = mtab->fmode[bits->ftype].sub; | |
190 | ||
191 | if (bits->ftype != TWINVQ_FT_SHORT && !tctx->is_6kbps) | |
192 | get_bits(&gb, 2); | |
193 | ||
194 | read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); | |
195 | ||
196 | for (i = 0; i < channels; i++) | |
197 | for (j = 0; j < sub; j++) | |
198 | for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) | |
199 | bits->bark1[i][j][k] = | |
200 | get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); | |
201 | ||
202 | for (i = 0; i < channels; i++) | |
203 | for (j = 0; j < sub; j++) | |
204 | bits->bark_use_hist[i][j] = get_bits1(&gb); | |
205 | ||
206 | if (bits->ftype == TWINVQ_FT_LONG) { | |
207 | for (i = 0; i < channels; i++) | |
208 | bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); | |
209 | } else { | |
210 | for (i = 0; i < channels; i++) { | |
211 | bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); | |
212 | for (j = 0; j < sub; j++) | |
213 | bits->sub_gain_bits[i * sub + j] = | |
214 | get_bits(&gb, TWINVQ_SUB_GAIN_BITS); | |
215 | } | |
216 | } | |
217 | ||
218 | for (i = 0; i < channels; i++) { | |
219 | bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); | |
220 | bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); | |
221 | ||
222 | for (j = 0; j < mtab->lsp_split; j++) | |
223 | bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); | |
224 | } | |
225 | ||
226 | if (bits->ftype == TWINVQ_FT_LONG) { | |
227 | read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); | |
228 | for (i = 0; i < channels; i++) { | |
229 | bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); | |
230 | bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); | |
231 | } | |
232 | } | |
233 | ||
234 | // subframes are aligned to nibbles | |
235 | if (get_bits_count(&gb) & 3) | |
236 | skip_bits(&gb, 4 - (get_bits_count(&gb) & 3)); | |
237 | } | |
238 | ||
239 | return (get_bits_count(&gb) + 7) / 8; | |
240 | } | |
241 | ||
242 | typedef struct MetasoundProps { | |
243 | uint32_t tag; | |
244 | int bit_rate; | |
245 | int channels; | |
246 | int sample_rate; | |
247 | } MetasoundProps; | |
248 | ||
249 | static const MetasoundProps codec_props[] = { | |
250 | { MKTAG('V','X','0','3'), 6, 1, 8000 }, | |
251 | { MKTAG('V','X','0','4'), 12, 2, 8000 }, | |
252 | ||
253 | { MKTAG('V','O','X','i'), 8, 1, 8000 }, | |
254 | { MKTAG('V','O','X','j'), 10, 1, 11025 }, | |
255 | { MKTAG('V','O','X','k'), 16, 1, 16000 }, | |
256 | { MKTAG('V','O','X','L'), 24, 1, 22050 }, | |
257 | { MKTAG('V','O','X','q'), 32, 1, 44100 }, | |
258 | { MKTAG('V','O','X','r'), 40, 1, 44100 }, | |
259 | { MKTAG('V','O','X','s'), 48, 1, 44100 }, | |
260 | { MKTAG('V','O','X','t'), 16, 2, 8000 }, | |
261 | { MKTAG('V','O','X','u'), 20, 2, 11025 }, | |
262 | { MKTAG('V','O','X','v'), 32, 2, 16000 }, | |
263 | { MKTAG('V','O','X','w'), 48, 2, 22050 }, | |
264 | { MKTAG('V','O','X','x'), 64, 2, 44100 }, | |
265 | { MKTAG('V','O','X','y'), 80, 2, 44100 }, | |
266 | { MKTAG('V','O','X','z'), 96, 2, 44100 }, | |
267 | ||
268 | { 0, 0, 0, 0 } | |
269 | }; | |
270 | ||
271 | static av_cold int metasound_decode_init(AVCodecContext *avctx) | |
272 | { | |
273 | int isampf, ibps; | |
274 | TwinVQContext *tctx = avctx->priv_data; | |
275 | uint32_t tag; | |
276 | const MetasoundProps *props = codec_props; | |
277 | ||
278 | if (!avctx->extradata || avctx->extradata_size < 16) { | |
279 | av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n"); | |
280 | return AVERROR_INVALIDDATA; | |
281 | } | |
282 | ||
283 | tag = AV_RL32(avctx->extradata + 12); | |
284 | ||
285 | for (;;) { | |
286 | if (!props->tag) { | |
287 | av_log(avctx, AV_LOG_ERROR, "Could not find tag %08"PRIX32"\n", tag); | |
288 | return AVERROR_INVALIDDATA; | |
289 | } | |
290 | if (props->tag == tag) { | |
291 | avctx->sample_rate = props->sample_rate; | |
292 | avctx->channels = props->channels; | |
293 | avctx->bit_rate = props->bit_rate * 1000; | |
294 | isampf = avctx->sample_rate / 1000; | |
295 | break; | |
296 | } | |
297 | props++; | |
298 | } | |
299 | ||
300 | if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) { | |
301 | av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n", | |
302 | avctx->channels); | |
303 | return AVERROR_INVALIDDATA; | |
304 | } | |
305 | avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO | |
306 | : AV_CH_LAYOUT_STEREO; | |
307 | ||
308 | ibps = avctx->bit_rate / (1000 * avctx->channels); | |
309 | ||
310 | switch ((avctx->channels << 16) + (isampf << 8) + ibps) { | |
311 | case (1 << 16) + ( 8 << 8) + 6: | |
312 | tctx->mtab = &ff_metasound_mode0806; | |
313 | break; | |
314 | case (2 << 16) + ( 8 << 8) + 6: | |
315 | tctx->mtab = &ff_metasound_mode0806s; | |
316 | break; | |
317 | case (1 << 16) + ( 8 << 8) + 8: | |
318 | tctx->mtab = &ff_metasound_mode0808; | |
319 | break; | |
320 | case (2 << 16) + ( 8 << 8) + 8: | |
321 | tctx->mtab = &ff_metasound_mode0808s; | |
322 | break; | |
323 | case (1 << 16) + (11 << 8) + 10: | |
324 | tctx->mtab = &ff_metasound_mode1110; | |
325 | break; | |
326 | case (2 << 16) + (11 << 8) + 10: | |
327 | tctx->mtab = &ff_metasound_mode1110s; | |
328 | break; | |
329 | case (1 << 16) + (16 << 8) + 16: | |
330 | tctx->mtab = &ff_metasound_mode1616; | |
331 | break; | |
332 | case (2 << 16) + (16 << 8) + 16: | |
333 | tctx->mtab = &ff_metasound_mode1616s; | |
334 | break; | |
335 | case (1 << 16) + (22 << 8) + 24: | |
336 | tctx->mtab = &ff_metasound_mode2224; | |
337 | break; | |
338 | case (2 << 16) + (22 << 8) + 24: | |
339 | tctx->mtab = &ff_metasound_mode2224s; | |
340 | break; | |
341 | case (1 << 16) + (44 << 8) + 32: | |
342 | tctx->mtab = &ff_metasound_mode4432; | |
343 | break; | |
344 | case (2 << 16) + (44 << 8) + 32: | |
345 | tctx->mtab = &ff_metasound_mode4432s; | |
346 | break; | |
347 | case (1 << 16) + (44 << 8) + 40: | |
348 | tctx->mtab = &ff_metasound_mode4440; | |
349 | break; | |
350 | case (2 << 16) + (44 << 8) + 40: | |
351 | tctx->mtab = &ff_metasound_mode4440s; | |
352 | break; | |
353 | case (1 << 16) + (44 << 8) + 48: | |
354 | tctx->mtab = &ff_metasound_mode4448; | |
355 | break; | |
356 | case (2 << 16) + (44 << 8) + 48: | |
357 | tctx->mtab = &ff_metasound_mode4448s; | |
358 | break; | |
359 | default: | |
360 | av_log(avctx, AV_LOG_ERROR, | |
361 | "This version does not support %d kHz - %d kbit/s/ch mode.\n", | |
362 | isampf, ibps); | |
363 | return AVERROR(ENOSYS); | |
364 | } | |
365 | ||
366 | tctx->codec = TWINVQ_CODEC_METASOUND; | |
367 | tctx->read_bitstream = metasound_read_bitstream; | |
368 | tctx->dec_bark_env = dec_bark_env; | |
369 | tctx->decode_ppc = decode_ppc; | |
370 | tctx->frame_size = avctx->bit_rate * tctx->mtab->size | |
371 | / avctx->sample_rate; | |
372 | tctx->is_6kbps = ibps == 6; | |
373 | ||
374 | return ff_twinvq_decode_init(avctx); | |
375 | } | |
376 | ||
377 | AVCodec ff_metasound_decoder = { | |
378 | .name = "metasound", | |
379 | .long_name = NULL_IF_CONFIG_SMALL("Voxware MetaSound"), | |
380 | .type = AVMEDIA_TYPE_AUDIO, | |
381 | .id = AV_CODEC_ID_METASOUND, | |
382 | .priv_data_size = sizeof(TwinVQContext), | |
383 | .init = metasound_decode_init, | |
384 | .close = ff_twinvq_decode_close, | |
385 | .decode = ff_twinvq_decode_frame, | |
386 | .capabilities = CODEC_CAP_DR1, | |
387 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, | |
388 | AV_SAMPLE_FMT_NONE }, | |
389 | }; |