FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/twinvqdec.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 126 177 71.2%
Functions: 7 7 100.0%
Branches: 68 98 69.4%
Line Branch Exec Source
1 /*
2 * TwinVQ decoder
3 * Copyright (c) 2009 Vitor Sessak
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 <math.h>
23 #include <stdint.h>
24
25 #include "libavutil/channel_layout.h"
26 #include "avcodec.h"
27 #include "codec_internal.h"
28 #include "get_bits.h"
29 #include "twinvq.h"
30 #include "twinvq_data.h"
31
32 static const TwinVQModeTab mode_08_08 = {
33 {
34 { 8, bark_tab_s08_64, 10, tab.fcb08s, 1, 5, tab.cb0808s0, tab.cb0808s1, 18 },
35 { 2, bark_tab_m08_256, 20, tab.fcb08m, 2, 5, tab.cb0808m0, tab.cb0808m1, 16 },
36 { 1, bark_tab_l08_512, 30, tab.fcb08l, 3, 6, tab.cb0808l0, tab.cb0808l1, 17 }
37 },
38 512, 12, ff_metasound_lsp8, 1, 5, 3, 3, tab.shape08, 8, 28, 20, 6, 40
39 };
40
41 static const TwinVQModeTab mode_11_08 = {
42 {
43 { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1108s0, tab.cb1108s1, 29 },
44 { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1108m0, tab.cb1108m1, 24 },
45 { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1108l0, tab.cb1108l1, 27 }
46 },
47 512, 16, ff_metasound_lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
48 };
49
50 static const TwinVQModeTab mode_11_10 = {
51 {
52 { 8, bark_tab_s11_64, 10, tab.fcb11s, 1, 5, tab.cb1110s0, tab.cb1110s1, 21 },
53 { 2, bark_tab_m11_256, 20, tab.fcb11m, 2, 5, tab.cb1110m0, tab.cb1110m1, 18 },
54 { 1, bark_tab_l11_512, 30, tab.fcb11l, 3, 6, tab.cb1110l0, tab.cb1110l1, 20 }
55 },
56 512, 16, ff_metasound_lsp11, 1, 6, 4, 3, tab.shape11, 9, 36, 30, 7, 90
57 };
58
59 static const TwinVQModeTab mode_16_16 = {
60 {
61 { 8, bark_tab_s16_128, 10, tab.fcb16s, 1, 5, tab.cb1616s0, tab.cb1616s1, 16 },
62 { 2, bark_tab_m16_512, 20, tab.fcb16m, 2, 5, tab.cb1616m0, tab.cb1616m1, 15 },
63 { 1, bark_tab_l16_1024, 30, tab.fcb16l, 3, 6, tab.cb1616l0, tab.cb1616l1, 16 }
64 },
65 1024, 16, ff_metasound_lsp16, 1, 6, 4, 3, tab.shape16, 9, 56, 60, 7, 180
66 };
67
68 static const TwinVQModeTab mode_22_20 = {
69 {
70 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18 },
71 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17 },
72 { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18 }
73 },
74 1024, 16, ff_metasound_lsp22, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
75 };
76
77 static const TwinVQModeTab mode_22_24 = {
78 {
79 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15 },
80 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14 },
81 { 1, bark_tab_l22_1024, 32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15 }
82 },
83 1024, 16, ff_metasound_lsp22, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
84 };
85
86 static const TwinVQModeTab mode_22_32 = {
87 {
88 { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11 },
89 { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11 },
90 { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12 }
91 },
92 512, 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
93 };
94
95 static const TwinVQModeTab mode_44_40 = {
96 {
97 { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4440s0, tab.cb4440s1, 18 },
98 { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4440m0, tab.cb4440m1, 17 },
99 { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4440l0, tab.cb4440l1, 17 }
100 },
101 2048, 20, ff_metasound_lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
102 };
103
104 static const TwinVQModeTab mode_44_48 = {
105 {
106 { 16, bark_tab_s44_128, 10, tab.fcb44s, 1, 6, tab.cb4448s0, tab.cb4448s1, 15 },
107 { 4, bark_tab_m44_512, 20, tab.fcb44m, 2, 6, tab.cb4448m0, tab.cb4448m1, 14 },
108 { 1, bark_tab_l44_2048, 40, tab.fcb44l, 4, 6, tab.cb4448l0, tab.cb4448l1, 14 }
109 },
110 2048, 20, ff_metasound_lsp44, 1, 6, 4, 4, tab.shape44, 9, 84, 54, 7, 432
111 };
112
113 /**
114 * Evaluate a * b / 400 rounded to the nearest integer. When, for example,
115 * a * b == 200 and the nearest integer is ill-defined, use a table to emulate
116 * the following broken float-based implementation used by the binary decoder:
117 *
118 * @code
119 * static int very_broken_op(int a, int b)
120 * {
121 * static float test; // Ugh, force gcc to do the division first...
122 *
123 * test = a / 400.0;
124 * return b * test + 0.5;
125 * }
126 * @endcode
127 *
128 * @note if this function is replaced by just ROUNDED_DIV(a * b, 400.0), the
129 * stddev between the original file (before encoding with Yamaha encoder) and
130 * the decoded output increases, which leads one to believe that the encoder
131 * expects exactly this broken calculation.
132 */
133 31849 static int very_broken_op(int a, int b)
134 {
135 31849 int x = a * b + 200;
136 int size;
137 const uint8_t *rtab;
138
139
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 31849 if (x % 400 || b % 5)
140 31775 return x / 400;
141
142 74 x /= 400;
143
144 74 size = tabs[b / 5].size;
145 74 rtab = tabs[b / 5].tab;
146 74 return x - rtab[size * av_log2(2 * (x - 1) / size) + (x - 1) % size];
147 }
148
149 /**
150 * Sum to data a periodic peak of a given period, width and shape.
151 *
152 * @param period the period of the peak divided by 400.0
153 */
154 2477 static void add_peak(int period, int width, const float *shape,
155 float ppc_gain, float *speech, int len)
156 {
157 int i, j;
158
159 2477 const float *shape_end = shape + len;
160 int center;
161
162 // First peak centered around zero
163
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 6428 for (i = 0; i < width / 2; i++)
164 3951 speech[i] += ppc_gain * *shape++;
165
166
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 31849 for (i = 1; i < ROUNDED_DIV(len, width); i++) {
167 29372 center = very_broken_op(period, i);
168
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 108515 for (j = -width / 2; j < (width + 1) / 2; j++)
169 79143 speech[j + center] += ppc_gain * *shape++;
170 }
171
172 // For the last block, be careful not to go beyond the end of the buffer
173 2477 center = very_broken_op(period, i);
174
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 8555 for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
175 6078 speech[j + center] += ppc_gain * *shape++;
176 2477 }
177
178 2477 static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
179 const float *shape, float *speech)
180 {
181 2477 const TwinVQModeTab *mtab = tctx->mtab;
182 2477 int isampf = tctx->avctx->sample_rate / 1000;
183 2477 int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->ch_layout.nb_channels);
184 2477 int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf);
185 2477 int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf);
186 2477 int period_range = max_period - min_period;
187 2477 float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1);
188 2477 float ppc_gain = 1.0 / 8192 *
189 4954 twinvq_mulawinv(pgain_step * g_coef +
190 2477 pgain_step / 2,
191 25000.0, TWINVQ_PGAIN_MU);
192
193 // This is actually the period multiplied by 400. It is just linearly coded
194 // between its maximum and minimum value.
195 2477 int period = min_period +
196
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 2477 ROUNDED_DIV(period_coef * period_range,
197 (1 << mtab->ppc_period_bit) - 1);
198 int width;
199
200
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 2477 if (isampf == 22 && ibps == 32) {
201 // For some unknown reason, NTT decided to code this case differently...
202 ✗ width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid,
203 400 * mtab->size);
204 } else
205 2477 width = period * mtab->peak_per2wid / (400 * mtab->size);
206
207 2477 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
208 2477 }
209
210 2709 static void dec_bark_env(TwinVQContext *tctx, const uint8_t *in, int use_hist,
211 int ch, float *out, float gain,
212 enum TwinVQFrameType ftype)
213 {
214 2709 const TwinVQModeTab *mtab = tctx->mtab;
215 int i, j;
216 2709 float *hist = tctx->bark_hist[ftype][ch];
217 2709 float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
218 2709 int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
219 2709 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
220 2709 int idx = 0;
221
222
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 24845 for (i = 0; i < fw_cb_len; i++)
223
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 105960 for (j = 0; j < bark_n_coef; j++, idx++) {
224 83824 float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
225 (1.0 / 4096);
226 138462 float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
227
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 83824 : tmp2 + 1.0;
228
229 83824 hist[idx] = tmp2;
230
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 83824 if (st < -1.0)
231 ✗ st = 1.0;
232
233 83824 twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
234 83824 out += mtab->fmode[ftype].bark_tab[idx];
235 }
236 2709 }
237
238 5067 static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
239 uint8_t *dst, enum TwinVQFrameType ftype)
240 {
241 int i;
242
243
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 165643 for (i = 0; i < tctx->n_div[ftype]; i++) {
244 160576 int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
245
246 160576 *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
247 160576 *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
248 }
249 5067 }
250
251 2590 static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
252 const uint8_t *buf, int buf_size)
253 {
254 2590 TwinVQFrameData *bits = &tctx->bits[0];
255 2590 const TwinVQModeTab *mtab = tctx->mtab;
256 2590 int channels = tctx->avctx->ch_layout.nb_channels;
257 int sub;
258 GetBitContext gb;
259 int i, j, k, ret;
260
261
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 2590 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
262 ✗ return ret;
263 2590 skip_bits(&gb, get_bits(&gb, 8));
264
265 2590 bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
266
267
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 2590 if (bits->window_type > 8) {
268 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
269 ✗ return AVERROR_INVALIDDATA;
270 }
271
272 2590 bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[0].window_type];
273
274 2590 sub = mtab->fmode[bits->ftype].sub;
275
276 2590 read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
277
278
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279
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280
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 13073 for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
281 10364 bits->bark1[i][j][k] =
282 10364 get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
283
284
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285
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 5299 for (j = 0; j < sub; j++)
286 2709 bits->bark_use_hist[i][j] = get_bits1(&gb);
287
288
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 2590 if (bits->ftype == TWINVQ_FT_LONG) {
289
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 4954 for (i = 0; i < channels; i++)
290 2477 bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
291 } else {
292
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 226 for (i = 0; i < channels; i++) {
293 113 bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
294
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 345 for (j = 0; j < sub; j++)
295 232 bits->sub_gain_bits[i * sub + j] = get_bits(&gb,
296 TWINVQ_SUB_GAIN_BITS);
297 }
298 }
299
300
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 5180 for (i = 0; i < channels; i++) {
301 2590 bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
302 2590 bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1);
303
304
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 10360 for (j = 0; j < mtab->lsp_split; j++)
305 7770 bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
306 }
307
308
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 2590 if (bits->ftype == TWINVQ_FT_LONG) {
309 2477 read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
310
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 4954 for (i = 0; i < channels; i++) {
311 2477 bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
312 2477 bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
313 }
314 }
315
316 2590 return (get_bits_count(&gb) + 7) / 8;
317 }
318
319 3 static av_cold int twinvq_decode_init(AVCodecContext *avctx)
320 {
321 int isampf, ibps, channels;
322 3 TwinVQContext *tctx = avctx->priv_data;
323
324
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 3 if (!avctx->extradata || avctx->extradata_size < 12) {
325 ✗ av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
326 ✗ return AVERROR_INVALIDDATA;
327 }
328 3 channels = AV_RB32(avctx->extradata) + 1;
329 3 avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
330 3 isampf = AV_RB32(avctx->extradata + 8);
331
332
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 3 if (isampf < 8 || isampf > 44) {
333 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
334 ✗ return AVERROR_INVALIDDATA;
335 }
336
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 3 switch (isampf) {
337 ✗ case 44:
338 ✗ avctx->sample_rate = 44100;
339 ✗ break;
340 3 case 22:
341 3 avctx->sample_rate = 22050;
342 3 break;
343 ✗ case 11:
344 ✗ avctx->sample_rate = 11025;
345 ✗ break;
346 ✗ default:
347 ✗ avctx->sample_rate = isampf * 1000;
348 ✗ break;
349 }
350
351
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 3 if (channels <= 0 || channels > TWINVQ_CHANNELS_MAX) {
352 ✗ av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
353 channels);
354 ✗ return -1;
355 }
356 3 av_channel_layout_uninit(&avctx->ch_layout);
357 3 av_channel_layout_default(&avctx->ch_layout, channels);
358
359 3 ibps = avctx->bit_rate / (1000 * channels);
360
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 3 if (ibps < 8 || ibps > 48) {
361 ✗ av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
362 ✗ return AVERROR_INVALIDDATA;
363 }
364
365
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 3 switch ((isampf << 8) + ibps) {
366 ✗ case (8 << 8) + 8:
367 ✗ tctx->mtab = &mode_08_08;
368 ✗ break;
369 ✗ case (11 << 8) + 8:
370 ✗ tctx->mtab = &mode_11_08;
371 ✗ break;
372 ✗ case (11 << 8) + 10:
373 ✗ tctx->mtab = &mode_11_10;
374 ✗ break;
375 ✗ case (16 << 8) + 16:
376 ✗ tctx->mtab = &mode_16_16;
377 ✗ break;
378 3 case (22 << 8) + 20:
379 3 tctx->mtab = &mode_22_20;
380 3 break;
381 ✗ case (22 << 8) + 24:
382 ✗ tctx->mtab = &mode_22_24;
383 ✗ break;
384 ✗ case (22 << 8) + 32:
385 ✗ tctx->mtab = &mode_22_32;
386 ✗ break;
387 ✗ case (44 << 8) + 40:
388 ✗ tctx->mtab = &mode_44_40;
389 ✗ break;
390 ✗ case (44 << 8) + 48:
391 ✗ tctx->mtab = &mode_44_48;
392 ✗ break;
393 ✗ default:
394 ✗ av_log(avctx, AV_LOG_ERROR,
395 "This version does not support %d kHz - %d kbit/s/ch mode.\n",
396 isampf, isampf);
397 ✗ return -1;
398 }
399
400 3 tctx->codec = TWINVQ_CODEC_VQF;
401 3 tctx->read_bitstream = twinvq_read_bitstream;
402 3 tctx->dec_bark_env = dec_bark_env;
403 3 tctx->decode_ppc = decode_ppc;
404 3 tctx->frame_size = avctx->bit_rate * tctx->mtab->size
405 3 / avctx->sample_rate + 8;
406 3 tctx->is_6kbps = 0;
407
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 3 if (avctx->block_align && avctx->block_align * 8LL / tctx->frame_size > 1) {
408 ✗ av_log(avctx, AV_LOG_ERROR,
409 "VQF TwinVQ should have only one frame per packet\n");
410 ✗ return AVERROR_INVALIDDATA;
411 }
412
413 3 return ff_twinvq_decode_init(avctx);
414 }
415
416 const FFCodec ff_twinvq_decoder = {
417 .p.name = "twinvq",
418 CODEC_LONG_NAME("VQF TwinVQ"),
419 .p.type = AVMEDIA_TYPE_AUDIO,
420 .p.id = AV_CODEC_ID_TWINVQ,
421 .priv_data_size = sizeof(TwinVQContext),
422 .init = twinvq_decode_init,
423 .close = ff_twinvq_decode_close,
424 FF_CODEC_DECODE_CB(ff_twinvq_decode_frame),
425 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
426 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
427 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
428 };
429