Line data Source code
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 "get_bits.h"
28 : #include "internal.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, tab.lsp08, 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, tab.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, tab.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, tab.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, tab.lsp22_1, 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, tab.lsp22_1, 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, tab.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, tab.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 31777 : static int very_broken_op(int a, int b)
134 : {
135 31777 : int x = a * b + 200;
136 : int size;
137 : const uint8_t *rtab;
138 :
139 31777 : if (x % 400 || b % 5)
140 31703 : 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 2475 : 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 2475 : const float *shape_end = shape + len;
160 : int center;
161 :
162 : // First peak centered around zero
163 6426 : for (i = 0; i < width / 2; i++)
164 3951 : speech[i] += ppc_gain * *shape++;
165 :
166 31777 : for (i = 1; i < ROUNDED_DIV(len, width); i++) {
167 29302 : center = very_broken_op(period, i);
168 108375 : for (j = -width / 2; j < (width + 1) / 2; j++)
169 79073 : 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 2475 : center = very_broken_op(period, i);
174 8551 : for (j = -width / 2; j < (width + 1) / 2 && shape < shape_end; j++)
175 6076 : speech[j + center] += ppc_gain * *shape++;
176 2475 : }
177 :
178 2475 : static void decode_ppc(TwinVQContext *tctx, int period_coef, int g_coef,
179 : const float *shape, float *speech)
180 : {
181 2475 : const TwinVQModeTab *mtab = tctx->mtab;
182 2475 : int isampf = tctx->avctx->sample_rate / 1000;
183 2475 : int ibps = tctx->avctx->bit_rate / (1000 * tctx->avctx->channels);
184 2475 : int min_period = ROUNDED_DIV(40 * 2 * mtab->size, isampf);
185 2475 : int max_period = ROUNDED_DIV(40 * 2 * mtab->size * 6, isampf);
186 2475 : int period_range = max_period - min_period;
187 2475 : float pgain_step = 25000.0 / ((1 << mtab->pgain_bit) - 1);
188 2475 : float ppc_gain = 1.0 / 8192 *
189 4950 : twinvq_mulawinv(pgain_step * g_coef +
190 2475 : 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 2475 : int period = min_period +
196 2475 : ROUNDED_DIV(period_coef * period_range,
197 : (1 << mtab->ppc_period_bit) - 1);
198 : int width;
199 :
200 2475 : if (isampf == 22 && ibps == 32) {
201 : // For some unknown reason, NTT decided to code this case differently...
202 0 : width = ROUNDED_DIV((period + 800) * mtab->peak_per2wid,
203 : 400 * mtab->size);
204 : } else
205 2475 : width = period * mtab->peak_per2wid / (400 * mtab->size);
206 :
207 2475 : add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
208 2475 : }
209 :
210 2707 : 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 2707 : const TwinVQModeTab *mtab = tctx->mtab;
215 : int i, j;
216 2707 : float *hist = tctx->bark_hist[ftype][ch];
217 2707 : float val = ((const float []) { 0.4, 0.35, 0.28 })[ftype];
218 2707 : int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
219 2707 : int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
220 2707 : int idx = 0;
221 :
222 24827 : for (i = 0; i < fw_cb_len; i++)
223 105880 : for (j = 0; j < bark_n_coef; j++, idx++) {
224 83760 : float tmp2 = mtab->fmode[ftype].bark_cb[fw_cb_len * in[j] + i] *
225 : (1.0 / 4096);
226 138334 : float st = use_hist ? (1.0 - val) * tmp2 + val * hist[idx] + 1.0
227 138334 : : tmp2 + 1.0;
228 :
229 83760 : hist[idx] = tmp2;
230 83760 : if (st < -1.0)
231 0 : st = 1.0;
232 :
233 83760 : twinvq_memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
234 83760 : out += mtab->fmode[ftype].bark_tab[idx];
235 : }
236 2707 : }
237 :
238 5063 : static void read_cb_data(TwinVQContext *tctx, GetBitContext *gb,
239 : uint8_t *dst, enum TwinVQFrameType ftype)
240 : {
241 : int i;
242 :
243 165515 : for (i = 0; i < tctx->n_div[ftype]; i++) {
244 160452 : int bs_second_part = (i >= tctx->bits_main_spec_change[ftype]);
245 :
246 160452 : *dst++ = get_bits(gb, tctx->bits_main_spec[0][ftype][bs_second_part]);
247 160452 : *dst++ = get_bits(gb, tctx->bits_main_spec[1][ftype][bs_second_part]);
248 : }
249 5063 : }
250 :
251 2588 : static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx,
252 : const uint8_t *buf, int buf_size)
253 : {
254 2588 : TwinVQFrameData *bits = &tctx->bits[0];
255 2588 : const TwinVQModeTab *mtab = tctx->mtab;
256 2588 : int channels = tctx->avctx->channels;
257 : int sub;
258 : GetBitContext gb;
259 : int i, j, k, ret;
260 :
261 2588 : if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
262 0 : return ret;
263 2588 : skip_bits(&gb, get_bits(&gb, 8));
264 :
265 2588 : bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS);
266 :
267 2588 : if (bits->window_type > 8) {
268 0 : av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
269 0 : return AVERROR_INVALIDDATA;
270 : }
271 :
272 2588 : bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits[0].window_type];
273 :
274 2588 : sub = mtab->fmode[bits->ftype].sub;
275 :
276 2588 : read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype);
277 :
278 5176 : for (i = 0; i < channels; i++)
279 5295 : for (j = 0; j < sub; j++)
280 13063 : for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++)
281 10356 : bits->bark1[i][j][k] =
282 10356 : get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit);
283 :
284 5176 : for (i = 0; i < channels; i++)
285 5295 : for (j = 0; j < sub; j++)
286 2707 : bits->bark_use_hist[i][j] = get_bits1(&gb);
287 :
288 2588 : if (bits->ftype == TWINVQ_FT_LONG) {
289 4950 : for (i = 0; i < channels; i++)
290 2475 : bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
291 : } else {
292 226 : for (i = 0; i < channels; i++) {
293 113 : bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS);
294 345 : 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 5176 : for (i = 0; i < channels; i++) {
301 2588 : bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0);
302 2588 : bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1);
303 :
304 10352 : for (j = 0; j < mtab->lsp_split; j++)
305 7764 : bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2);
306 : }
307 :
308 2588 : if (bits->ftype == TWINVQ_FT_LONG) {
309 2475 : read_cb_data(tctx, &gb, bits->ppc_coeffs, 3);
310 4950 : for (i = 0; i < channels; i++) {
311 2475 : bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit);
312 2475 : bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit);
313 : }
314 : }
315 :
316 2588 : 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;
322 3 : TwinVQContext *tctx = avctx->priv_data;
323 :
324 3 : if (!avctx->extradata || avctx->extradata_size < 12) {
325 0 : av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
326 0 : return AVERROR_INVALIDDATA;
327 : }
328 3 : avctx->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 3 : if (isampf < 8 || isampf > 44) {
333 0 : av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
334 0 : return AVERROR_INVALIDDATA;
335 : }
336 3 : switch (isampf) {
337 0 : case 44:
338 0 : avctx->sample_rate = 44100;
339 0 : break;
340 3 : case 22:
341 3 : avctx->sample_rate = 22050;
342 3 : break;
343 0 : case 11:
344 0 : avctx->sample_rate = 11025;
345 0 : break;
346 0 : default:
347 0 : avctx->sample_rate = isampf * 1000;
348 0 : break;
349 : }
350 :
351 3 : if (avctx->channels <= 0 || avctx->channels > TWINVQ_CHANNELS_MAX) {
352 0 : av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
353 : avctx->channels);
354 0 : return -1;
355 : }
356 6 : avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO
357 3 : : AV_CH_LAYOUT_STEREO;
358 :
359 3 : ibps = avctx->bit_rate / (1000 * avctx->channels);
360 3 : if (ibps < 8 || ibps > 48) {
361 0 : av_log(avctx, AV_LOG_ERROR, "Bad bitrate per channel value %d\n", ibps);
362 0 : return AVERROR_INVALIDDATA;
363 : }
364 :
365 3 : switch ((isampf << 8) + ibps) {
366 0 : case (8 << 8) + 8:
367 0 : tctx->mtab = &mode_08_08;
368 0 : break;
369 0 : case (11 << 8) + 8:
370 0 : tctx->mtab = &mode_11_08;
371 0 : break;
372 0 : case (11 << 8) + 10:
373 0 : tctx->mtab = &mode_11_10;
374 0 : break;
375 0 : case (16 << 8) + 16:
376 0 : tctx->mtab = &mode_16_16;
377 0 : break;
378 3 : case (22 << 8) + 20:
379 3 : tctx->mtab = &mode_22_20;
380 3 : break;
381 0 : case (22 << 8) + 24:
382 0 : tctx->mtab = &mode_22_24;
383 0 : break;
384 0 : case (22 << 8) + 32:
385 0 : tctx->mtab = &mode_22_32;
386 0 : break;
387 0 : case (44 << 8) + 40:
388 0 : tctx->mtab = &mode_44_40;
389 0 : break;
390 0 : case (44 << 8) + 48:
391 0 : tctx->mtab = &mode_44_48;
392 0 : break;
393 0 : default:
394 0 : av_log(avctx, AV_LOG_ERROR,
395 : "This version does not support %d kHz - %d kbit/s/ch mode.\n",
396 : isampf, isampf);
397 0 : 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 6 : tctx->frame_size = avctx->bit_rate * tctx->mtab->size
405 3 : / avctx->sample_rate + 8;
406 3 : tctx->is_6kbps = 0;
407 3 : if (avctx->block_align && avctx->block_align * 8 / tctx->frame_size > 1) {
408 0 : av_log(avctx, AV_LOG_ERROR,
409 : "VQF TwinVQ should have only one frame per packet\n");
410 0 : return AVERROR_INVALIDDATA;
411 : }
412 :
413 3 : return ff_twinvq_decode_init(avctx);
414 : }
415 :
416 : AVCodec ff_twinvq_decoder = {
417 : .name = "twinvq",
418 : .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
419 : .type = AVMEDIA_TYPE_AUDIO,
420 : .id = AV_CODEC_ID_TWINVQ,
421 : .priv_data_size = sizeof(TwinVQContext),
422 : .init = twinvq_decode_init,
423 : .close = ff_twinvq_decode_close,
424 : .decode = ff_twinvq_decode_frame,
425 : .capabilities = AV_CODEC_CAP_DR1,
426 : .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
427 : AV_SAMPLE_FMT_NONE },
428 : };
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