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path: root/libavcodec/metasound.c (plain)
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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#include "libavutil/channel_layout.h"
29#include "libavutil/float_dsp.h"
30
31#define BITSTREAM_READER_LE
32#include "avcodec.h"
33#include "fft.h"
34#include "get_bits.h"
35#include "internal.h"
36#include "lsp.h"
37#include "sinewin.h"
38
39#include "twinvq.h"
40#include "metasound_data.h"
41
42static void add_peak(float period, int width, const float *shape,
43 float ppc_gain, float *speech, int len)
44{
45 int i, j, center;
46 const float *shape_end = shape + len;
47
48 // First peak centered around zero
49 for (i = 0; i < width / 2; i++)
50 speech[i] += ppc_gain * *shape++;
51
52 for (i = 1; i < ROUNDED_DIV(len, width); i++) {
53 center = (int)(i * period + 0.5);
54 for (j = -width / 2; j < (width + 1) / 2; j++)
55 speech[j + center] += ppc_gain * *shape++;
56 }
57
58 // For the last block, be careful not to go beyond the end of the buffer
59 center = (int)(i * period + 0.5);
60 for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
61 speech[j + center] += ppc_gain * *shape++;
62}
63
64static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
65 const float *shape, float *speech)
66{
67 const TwinVQModeTab *mtab = tctx->mtab;
68 int isampf = tctx->avctx->sample_rate / 1000;
69 int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels);
70 int width;
71
72 float ratio = (float)mtab->size / isampf;
73 float min_period, max_period, period_range, period;
74 float some_mult;
75
76 float pgain_base, pgain_step, ppc_gain;
77
78 if (tctx->avctx->channels == 1) {
79 min_period = log2(ratio * 0.2);
80 max_period = min_period + log2(6);
81 } else {
82 min_period = (int)(ratio * 0.2 * 400 + 0.5) / 400.0;
83 max_period = (int)(ratio * 0.2 * 400 * 6 + 0.5) / 400.0;
84 }
85 period_range = max_period - min_period;
86 period = min_period + period_coef * period_range /
87 ((1 << mtab->ppc_period_bit) - 1);
88 if (tctx->avctx->channels == 1)
89 period = powf(2.0, period);
90 else
91 period = (int)(period * 400 + 0.5) / 400.0;
92
93 switch (isampf) {
94 case 8: some_mult = 2.0; break;
95 case 11: some_mult = 3.0; break;
96 case 16: some_mult = 3.0; break;
97 case 22: some_mult = ibps == 32 ? 2.0 : 4.0; break;
98 case 44: some_mult = 8.0; break;
99 default: some_mult = 4.0;
100 }
101
102 width = (int)(some_mult / (mtab->size / period) * mtab->ppc_shape_len);
103 if (isampf == 22 && ibps == 32)
104 width = (int)((2.0 / period + 1) * width + 0.5);
105
106 pgain_base = tctx->avctx->channels == 2 ? 25000.0 : 20000.0;
107 pgain_step = pgain_base / ((1 << mtab->pgain_bit) - 1);
108 ppc_gain = 1.0 / 8192 *
109 twinvq_mulawinv(pgain_step * g_coef + pgain_step / 2,
110 pgain_base, TWINVQ_PGAIN_MU);
111
112 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
113}
114
115static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist,
116 int ch, float *out, float gain,
117 enum TwinVQFrameType ftype)
118{
119 const TwinVQModeTab *mtab = tctx->mtab;
120 int i, j;
121 float *hist = tctx->bark_hist[ftype][ch];
122 float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
123 int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
124 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
125 int idx = 0;
126
127 if (tctx->avctx->channels == 1)
128 val = 0.5;
129 for (i = 0; i < fw_cb_len; i++)
130 for (j = 0; j < bark_n_coef; j++, idx++) {
131 float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
132 (1.0 / 2048);
133 float st;
134
135 if (tctx->avctx->channels == 1)
136 st = use_hist ?
137 tmp2 + val * hist[idx] + 1.0 : tmp2 + 1.0;
138 else
139 st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
140 : tmp2 + 1.0;
141
142 hist[idx] = tmp2;
143 if (st < 0.1)
144 st = 0.1;
145
146 twinvq_memset_float(out, st * gain,
147 mtab->fmode[ftype].bark_tab[idx]);
148 out += mtab->fmode[ftype].bark_tab[idx];
149 }
150}
151
152static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
153 uint8_t *dst, enum TwinVQFrameType ftype)
154{
155 int i;
156
157 for (i = 0; i < tctx->n_div[ftype]; i++) {
158 int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
159
160 *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
161 *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
162 }
163}
164
165static int metasound_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
166 const uint8_t *buf, int buf_size)
167{
168 TwinVQFrameData *bits;
169 const TwinVQModeTab *mtab = tctx->mtab;
170 int channels = tctx->avctx->channels;
171 int sub;
172 GetBitContext gb;
173 int i, j, k, ret;
174
175 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
176 return ret;
177
178 for (tctx->cur_frame = 0; tctx->cur_frame < tctx->frames_per_packet;
179 tctx->cur_frame++) {
180 bits = tctx->bits + tctx->cur_frame;
181
182 bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
183
184 if (bits->window_type > 8) {
185 av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
186 return AVERROR_INVALIDDATA;
187 }
188
189 bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[tctx->cur_frame].window_type];
190
191 sub = mtab->fmode[bits->ftype].sub;
192
193 if (bits->ftype != TWINVQ_FT_SHORT && !tctx->is_6kbps)
194 get_bits(&gb, 2);
195
196 read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
197
198 for (i = 0; i < channels; i++)
199 for (j = 0; j < sub; j++)
200 for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
201 bits->bark1[i][j][k] =
202 get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
203
204 for (i = 0; i < channels; i++)
205 for (j = 0; j < sub; j++)
206 bits->bark_use_hist[i][j] = get_bits1(&gb);
207
208 if (bits->ftype == TWINVQ_FT_LONG) {
209 for (i = 0; i < channels; i++)
210 bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
211 } else {
212 for (i = 0; i < channels; i++) {
213 bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
214 for (j = 0; j < sub; j++)
215 bits->sub_gain_bits[i * sub + j] =
216 get_bits(&gb, TWINVQ_SUB_GAIN_BITS);
217 }
218 }
219
220 for (i = 0; i < channels; i++) {
221 bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
222 bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1);
223
224 for (j = 0; j < mtab->lsp_split; j++)
225 bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
226 }
227
228 if (bits->ftype == TWINVQ_FT_LONG) {
229 read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
230 for (i = 0; i < channels; i++) {
231 bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
232 bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
233 }
234 }
235
236 // subframes are aligned to nibbles
237 if (get_bits_count(&gb) & 3)
238 skip_bits(&gb, 4 - (get_bits_count(&gb) & 3));
239 }
240
241 return (get_bits_count(&gb) + 7) / 8;
242}
243
244typedef struct MetasoundProps {
245 uint32_t tag;
246 int bit_rate;
247 int channels;
248 int sample_rate;
249} MetasoundProps;
250
251static const MetasoundProps codec_props[] = {
252 { MKTAG('V','X','0','3'), 6, 1, 8000 },
253 { MKTAG('V','X','0','4'), 12, 2, 8000 },
254
255 { MKTAG('V','O','X','i'), 8, 1, 8000 },
256 { MKTAG('V','O','X','j'), 10, 1, 11025 },
257 { MKTAG('V','O','X','k'), 16, 1, 16000 },
258 { MKTAG('V','O','X','L'), 24, 1, 22050 },
259 { MKTAG('V','O','X','q'), 32, 1, 44100 },
260 { MKTAG('V','O','X','r'), 40, 1, 44100 },
261 { MKTAG('V','O','X','s'), 48, 1, 44100 },
262 { MKTAG('V','O','X','t'), 16, 2, 8000 },
263 { MKTAG('V','O','X','u'), 20, 2, 11025 },
264 { MKTAG('V','O','X','v'), 32, 2, 16000 },
265 { MKTAG('V','O','X','w'), 48, 2, 22050 },
266 { MKTAG('V','O','X','x'), 64, 2, 44100 },
267 { MKTAG('V','O','X','y'), 80, 2, 44100 },
268 { MKTAG('V','O','X','z'), 96, 2, 44100 },
269
270 { 0, 0, 0, 0 }
271};
272
273static av_cold int metasound_decode_init(AVCodecContext *avctx)
274{
275 int isampf, ibps;
276 TwinVQContext *tctx = avctx->priv_data;
277 uint32_t tag;
278 const MetasoundProps *props = codec_props;
279
280 if (!avctx->extradata || avctx->extradata_size < 16) {
281 av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
282 return AVERROR_INVALIDDATA;
283 }
284
285 tag = AV_RL32(avctx->extradata + 12);
286
287 for (;;) {
288 if (!props->tag) {
289 av_log(avctx, AV_LOG_ERROR, "Could not find tag %08"PRIX32"\n", tag);
290 return AVERROR_INVALIDDATA;
291 }
292 if (props->tag == tag) {
293 avctx->sample_rate = props->sample_rate;
294 avctx->channels = props->channels;
295 avctx->bit_rate = props->bit_rate * 1000;
296 isampf = avctx->sample_rate / 1000;
297 break;
298 }
299 props++;
300 }
301
302 if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) {
303 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
304 avctx->channels);
305 return AVERROR_INVALIDDATA;
306 }
307 avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
308 : AV_CH_LAYOUT_STEREO;
309
310 ibps = avctx->bit_rate / (1000 * avctx->channels);
311
312 switch ((avctx->channels << 16) + (isampf << 8) + ibps) {
313 case (1 << 16) + ( 8 << 8) + 6:
314 tctx->mtab = &ff_metasound_mode0806;
315 break;
316 case (2 << 16) + ( 8 << 8) + 6:
317 tctx->mtab = &ff_metasound_mode0806s;
318 break;
319 case (1 << 16) + ( 8 << 8) + 8:
320 tctx->mtab = &ff_metasound_mode0808;
321 break;
322 case (2 << 16) + ( 8 << 8) + 8:
323 tctx->mtab = &ff_metasound_mode0808s;
324 break;
325 case (1 << 16) + (11 << 8) + 10:
326 tctx->mtab = &ff_metasound_mode1110;
327 break;
328 case (2 << 16) + (11 << 8) + 10:
329 tctx->mtab = &ff_metasound_mode1110s;
330 break;
331 case (1 << 16) + (16 << 8) + 16:
332 tctx->mtab = &ff_metasound_mode1616;
333 break;
334 case (2 << 16) + (16 << 8) + 16:
335 tctx->mtab = &ff_metasound_mode1616s;
336 break;
337 case (1 << 16) + (22 << 8) + 24:
338 tctx->mtab = &ff_metasound_mode2224;
339 break;
340 case (2 << 16) + (22 << 8) + 24:
341 tctx->mtab = &ff_metasound_mode2224s;
342 break;
343 case (1 << 16) + (44 << 8) + 32:
344 tctx->mtab = &ff_metasound_mode4432;
345 break;
346 case (2 << 16) + (44 << 8) + 32:
347 tctx->mtab = &ff_metasound_mode4432s;
348 break;
349 case (1 << 16) + (44 << 8) + 40:
350 tctx->mtab = &ff_metasound_mode4440;
351 break;
352 case (2 << 16) + (44 << 8) + 40:
353 tctx->mtab = &ff_metasound_mode4440s;
354 break;
355 case (1 << 16) + (44 << 8) + 48:
356 tctx->mtab = &ff_metasound_mode4448;
357 break;
358 case (2 << 16) + (44 << 8) + 48:
359 tctx->mtab = &ff_metasound_mode4448s;
360 break;
361 default:
362 av_log(avctx, AV_LOG_ERROR,
363 "This version does not support %d kHz - %d kbit/s/ch mode.\n",
364 isampf, ibps);
365 return AVERROR(ENOSYS);
366 }
367
368 tctx->codec = TWINVQ_CODEC_METASOUND;
369 tctx->read_bitstream = metasound_read_bitstream;
370 tctx->dec_bark_env = dec_bark_env;
371 tctx->decode_ppc = decode_ppc;
372 tctx->frame_size = avctx->bit_rate * tctx->mtab->size
373 / avctx->sample_rate;
374 tctx->is_6kbps = ibps == 6;
375
376 return ff_twinvq_decode_init(avctx);
377}
378
379AVCodec ff_metasound_decoder = {
380 .name = "metasound",
381 .long_name = NULL_IF_CONFIG_SMALL("Voxware MetaSound"),
382 .type = AVMEDIA_TYPE_AUDIO,
383 .id = AV_CODEC_ID_METASOUND,
384 .priv_data_size = sizeof(TwinVQContext),
385 .init = metasound_decode_init,
386 .close = ff_twinvq_decode_close,
387 .decode = ff_twinvq_decode_frame,
388 .capabilities = AV_CODEC_CAP_DR1,
389 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
390 AV_SAMPLE_FMT_NONE },
391};
392
generated by cgit at 2024-05-17 05:12:42 (GMT)