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
add_peak(float period,int width,const float * shape,float ppc_gain,float * speech,int len)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
decode_ppc(TwinVQContext * tctx,int period_coef,int g_coef,const float * shape,float * speech)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
dec_bark_env(TwinVQContext * tctx,const uint8_t * in,int use_hist,int ch,float * out,float gain,enum TwinVQFrameType ftype)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
read_cb_data(TwinVQContext * tctx,GetBitContext * gb,uint8_t * dst,enum TwinVQFrameType ftype)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
metasound_read_bitstream(AVCodecContext * avctx,TwinVQContext * tctx,const uint8_t * buf,int buf_size)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
metasound_decode_init(AVCodecContext * avctx)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 };
390