twinvq: fix out of bounds array access
[libav.git] / libavcodec / twinvq.c
CommitLineData
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1/*
2 * TwinVQ decoder
3 * Copyright (c) 2009 Vitor Sessak
4 *
2912e87a 5 * This file is part of Libav.
7bd47335 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avcodec.h"
23#include "get_bits.h"
24#include "dsputil.h"
1429224b 25#include "fft.h"
9401357f 26#include "lsp.h"
4538729a 27#include "sinewin.h"
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28
29#include <math.h>
30#include <stdint.h>
31
32#include "twinvq_data.h"
33
34enum FrameType {
35 FT_SHORT = 0, ///< Short frame (divided in n sub-blocks)
36 FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks)
37 FT_LONG, ///< Long frame (single sub-block + PPC)
38 FT_PPC, ///< Periodic Peak Component (part of the long frame)
39};
40
41/**
42 * Parameters and tables that are different for each frame type
43 */
44struct FrameMode {
45 uint8_t sub; ///< Number subblocks in each frame
46 const uint16_t *bark_tab;
47
48 /** number of distinct bark scale envelope values */
49 uint8_t bark_env_size;
50
51 const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE)
52 uint8_t bark_n_coef;///< number of BSE CB coefficients to read
53 uint8_t bark_n_bit; ///< number of bits of the BSE coefs
54
55 //@{
56 /** main codebooks for spectrum data */
57 const int16_t *cb0;
58 const int16_t *cb1;
59 //@}
60
61 uint8_t cb_len_read; ///< number of spectrum coefficients to read
62};
63
64/**
65 * Parameters and tables that are different for every combination of
66 * bitrate/sample rate
67 */
68typedef struct {
69 struct FrameMode fmode[3]; ///< frame type-dependant parameters
70
71 uint16_t size; ///< frame size in samples
72 uint8_t n_lsp; ///< number of lsp coefficients
73 const float *lspcodebook;
74
75 /* number of bits of the different LSP CB coefficients */
76 uint8_t lsp_bit0;
77 uint8_t lsp_bit1;
78 uint8_t lsp_bit2;
79
80 uint8_t lsp_split; ///< number of CB entries for the LSP decoding
81 const int16_t *ppc_shape_cb; ///< PPC shape CB
82
83 /** number of the bits for the PPC period value */
84 uint8_t ppc_period_bit;
85
86 uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs
87 uint8_t ppc_shape_len; ///< size of PPC shape CB
88 uint8_t pgain_bit; ///< bits for PPC gain
89
90 /** constant for peak period to peak width conversion */
91 uint16_t peak_per2wid;
92} ModeTab;
93
94static const ModeTab mode_08_08 = {
95 {
96 { 8, bark_tab_s08_64, 10, tab.fcb08s , 1, 5, tab.cb0808s0, tab.cb0808s1, 18},
97 { 2, bark_tab_m08_256, 20, tab.fcb08m , 2, 5, tab.cb0808m0, tab.cb0808m1, 16},
98 { 1, bark_tab_l08_512, 30, tab.fcb08l , 3, 6, tab.cb0808l0, tab.cb0808l1, 17}
99 },
100 512 , 12, tab.lsp08, 1, 5, 3, 3, tab.shape08 , 8, 28, 20, 6, 40
101};
102
103static const ModeTab mode_11_08 = {
104 {
105 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1108s0, tab.cb1108s1, 29},
106 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1108m0, tab.cb1108m1, 24},
107 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1108l0, tab.cb1108l1, 27}
108 },
109 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
110};
111
112static const ModeTab mode_11_10 = {
113 {
114 { 8, bark_tab_s11_64, 10, tab.fcb11s , 1, 5, tab.cb1110s0, tab.cb1110s1, 21},
115 { 2, bark_tab_m11_256, 20, tab.fcb11m , 2, 5, tab.cb1110m0, tab.cb1110m1, 18},
116 { 1, bark_tab_l11_512, 30, tab.fcb11l , 3, 6, tab.cb1110l0, tab.cb1110l1, 20}
117 },
118 512 , 16, tab.lsp11, 1, 6, 4, 3, tab.shape11 , 9, 36, 30, 7, 90
119};
120
121static const ModeTab mode_16_16 = {
122 {
123 { 8, bark_tab_s16_128, 10, tab.fcb16s , 1, 5, tab.cb1616s0, tab.cb1616s1, 16},
124 { 2, bark_tab_m16_512, 20, tab.fcb16m , 2, 5, tab.cb1616m0, tab.cb1616m1, 15},
125 { 1, bark_tab_l16_1024,30, tab.fcb16l , 3, 6, tab.cb1616l0, tab.cb1616l1, 16}
126 },
127 1024, 16, tab.lsp16, 1, 6, 4, 3, tab.shape16 , 9, 56, 60, 7, 180
128};
129
130static const ModeTab mode_22_20 = {
131 {
132 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2220s0, tab.cb2220s1, 18},
133 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2220m0, tab.cb2220m1, 17},
134 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2220l0, tab.cb2220l1, 18}
135 },
136 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
137};
138
139static const ModeTab mode_22_24 = {
140 {
141 { 8, bark_tab_s22_128, 10, tab.fcb22s_1, 1, 6, tab.cb2224s0, tab.cb2224s1, 15},
142 { 2, bark_tab_m22_512, 20, tab.fcb22m_1, 2, 6, tab.cb2224m0, tab.cb2224m1, 14},
143 { 1, bark_tab_l22_1024,32, tab.fcb22l_1, 4, 6, tab.cb2224l0, tab.cb2224l1, 15}
144 },
145 1024, 16, tab.lsp22_1, 1, 6, 4, 3, tab.shape22_1, 9, 56, 36, 7, 144
146};
147
148static const ModeTab mode_22_32 = {
149 {
150 { 4, bark_tab_s22_128, 10, tab.fcb22s_2, 1, 6, tab.cb2232s0, tab.cb2232s1, 11},
151 { 2, bark_tab_m22_256, 20, tab.fcb22m_2, 2, 6, tab.cb2232m0, tab.cb2232m1, 11},
152 { 1, bark_tab_l22_512, 32, tab.fcb22l_2, 4, 6, tab.cb2232l0, tab.cb2232l1, 12}
153 },
154 512 , 16, tab.lsp22_2, 1, 6, 4, 4, tab.shape22_2, 9, 56, 36, 7, 72
155};
156
157static const ModeTab mode_44_40 = {
158 {
159 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4440s0, tab.cb4440s1, 18},
160 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4440m0, tab.cb4440m1, 17},
161 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4440l0, tab.cb4440l1, 17}
162 },
163 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
164};
165
166static const ModeTab mode_44_48 = {
167 {
168 {16, bark_tab_s44_128, 10, tab.fcb44s , 1, 6, tab.cb4448s0, tab.cb4448s1, 15},
169 { 4, bark_tab_m44_512, 20, tab.fcb44m , 2, 6, tab.cb4448m0, tab.cb4448m1, 14},
170 { 1, bark_tab_l44_2048,40, tab.fcb44l , 4, 6, tab.cb4448l0, tab.cb4448l1, 14}
171 },
172 2048, 20, tab.lsp44, 1, 6, 4, 4, tab.shape44 , 9, 84, 54, 7, 432
173};
174
175typedef struct TwinContext {
176 AVCodecContext *avctx;
0eea2129 177 AVFrame frame;
7bd47335 178 DSPContext dsp;
01b22147 179 FFTContext mdct_ctx[3];
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180
181 const ModeTab *mtab;
182
183 // history
184 float lsp_hist[2][20]; ///< LSP coefficients of the last frame
185 float bark_hist[3][2][40]; ///< BSE coefficients of last frame
186
187 // bitstream parameters
188 int16_t permut[4][4096];
189 uint8_t length[4][2]; ///< main codebook stride
190 uint8_t length_change[4];
191 uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook
192 int bits_main_spec_change[4];
193 int n_div[4];
194
195 float *spectrum;
196 float *curr_frame; ///< non-interleaved output
197 float *prev_frame; ///< non-interleaved previous frame
198 int last_block_pos[2];
0eea2129 199 int discarded_packets;
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200
201 float *cos_tabs[3];
202
203 // scratch buffers
204 float *tmp_buf;
205} TwinContext;
206
207#define PPC_SHAPE_CB_SIZE 64
becfe99a 208#define PPC_SHAPE_LEN_MAX 60
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209#define SUB_AMP_MAX 4500.0
210#define MULAW_MU 100.0
211#define GAIN_BITS 8
212#define AMP_MAX 13000.0
213#define SUB_GAIN_BITS 5
214#define WINDOW_TYPE_BITS 4
215#define PGAIN_MU 200
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216#define LSP_COEFS_MAX 20
217#define LSP_SPLIT_MAX 4
218#define CHANNELS_MAX 2
219#define SUBBLOCKS_MAX 16
220#define BARK_N_COEF_MAX 4
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221
222/** @note not speed critical, hence not optimized */
223static void memset_float(float *buf, float val, int size)
224{
225 while (size--)
226 *buf++ = val;
227}
228
229/**
230 * Evaluate a single LPC amplitude spectrum envelope coefficient from the line
231 * spectrum pairs.
232 *
233 * @param lsp a vector of the cosinus of the LSP values
234 * @param cos_val cos(PI*i/N) where i is the index of the LPC amplitude
235 * @param order the order of the LSP (and the size of the *lsp buffer). Must
236 * be a multiple of four.
237 * @return the LPC value
238 *
046f3cb7 239 * @todo reuse code from Vorbis decoder: vorbis_floor0_decode
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240 */
241static float eval_lpc_spectrum(const float *lsp, float cos_val, int order)
242{
243 int j;
244 float p = 0.5f;
245 float q = 0.5f;
246 float two_cos_w = 2.0f*cos_val;
247
bf8202f3 248 for (j = 0; j + 1 < order; j += 2*2) {
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249 // Unroll the loop once since order is a multiple of four
250 q *= lsp[j ] - two_cos_w;
251 p *= lsp[j+1] - two_cos_w;
252
253 q *= lsp[j+2] - two_cos_w;
254 p *= lsp[j+3] - two_cos_w;
255 }
256
257 p *= p * (2.0f - two_cos_w);
258 q *= q * (2.0f + two_cos_w);
259
260 return 0.5 / (p + q);
261}
262
263/**
49bd8e4b 264 * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
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265 */
266static void eval_lpcenv(TwinContext *tctx, const float *cos_vals, float *lpc)
267{
268 int i;
269 const ModeTab *mtab = tctx->mtab;
270 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
271
bf8202f3 272 for (i = 0; i < size_s/2; i++) {
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273 float cos_i = tctx->cos_tabs[0][i];
274 lpc[i] = eval_lpc_spectrum(cos_vals, cos_i, mtab->n_lsp);
275 lpc[size_s-i-1] = eval_lpc_spectrum(cos_vals, -cos_i, mtab->n_lsp);
276 }
277}
278
279static void interpolate(float *out, float v1, float v2, int size)
280{
281 int i;
282 float step = (v1 - v2)/(size + 1);
283
bf8202f3 284 for (i = 0; i < size; i++) {
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285 v2 += step;
286 out[i] = v2;
287 }
288}
289
290static inline float get_cos(int idx, int part, const float *cos_tab, int size)
291{
292 return part ? -cos_tab[size - idx - 1] :
293 cos_tab[ idx ];
294}
295
296/**
49bd8e4b 297 * Evaluate the LPC amplitude spectrum envelope from the line spectrum pairs.
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298 * Probably for speed reasons, the coefficients are evaluated as
299 * siiiibiiiisiiiibiiiisiiiibiiiisiiiibiiiis ...
300 * where s is an evaluated value, i is a value interpolated from the others
301 * and b might be either calculated or interpolated, depending on an
302 * unexplained condition.
303 *
304 * @param step the size of a block "siiiibiiii"
305 * @param in the cosinus of the LSP data
306 * @param part is 0 for 0...PI (positive cossinus values) and 1 for PI...2PI
307 (negative cossinus values)
308 * @param size the size of the whole output
309 */
310static inline void eval_lpcenv_or_interp(TwinContext *tctx,
311 enum FrameType ftype,
312 float *out, const float *in,
313 int size, int step, int part)
314{
315 int i;
316 const ModeTab *mtab = tctx->mtab;
317 const float *cos_tab = tctx->cos_tabs[ftype];
318
319 // Fill the 's'
bf8202f3 320 for (i = 0; i < size; i += step)
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321 out[i] =
322 eval_lpc_spectrum(in,
323 get_cos(i, part, cos_tab, size),
324 mtab->n_lsp);
325
326 // Fill the 'iiiibiiii'
bf8202f3 327 for (i = step; i <= size - 2*step; i += step) {
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328 if (out[i + step] + out[i - step] > 1.95*out[i] ||
329 out[i + step] >= out[i - step]) {
330 interpolate(out + i - step + 1, out[i], out[i-step], step - 1);
331 } else {
332 out[i - step/2] =
333 eval_lpc_spectrum(in,
334 get_cos(i-step/2, part, cos_tab, size),
335 mtab->n_lsp);
336 interpolate(out + i - step + 1, out[i-step/2], out[i-step ], step/2 - 1);
337 interpolate(out + i - step/2 + 1, out[i ], out[i-step/2], step/2 - 1);
338 }
339 }
340
341 interpolate(out + size - 2*step + 1, out[size-step], out[size - 2*step], step - 1);
342}
343
344static void eval_lpcenv_2parts(TwinContext *tctx, enum FrameType ftype,
345 const float *buf, float *lpc,
346 int size, int step)
347{
348 eval_lpcenv_or_interp(tctx, ftype, lpc , buf, size/2, step, 0);
349 eval_lpcenv_or_interp(tctx, ftype, lpc + size/2, buf, size/2, 2*step, 1);
350
351 interpolate(lpc+size/2-step+1, lpc[size/2], lpc[size/2-step], step);
352
353 memset_float(lpc + size - 2*step + 1, lpc[size - 2*step], 2*step - 1);
354}
355
356/**
357 * Inverse quantization. Read CB coefficients for cb1 and cb2 from the
358 * bitstream, sum the corresponding vectors and write the result to *out
359 * after permutation.
360 */
361static void dequant(TwinContext *tctx, GetBitContext *gb, float *out,
362 enum FrameType ftype,
363 const int16_t *cb0, const int16_t *cb1, int cb_len)
364{
365 int pos = 0;
366 int i, j;
367
bf8202f3 368 for (i = 0; i < tctx->n_div[ftype]; i++) {
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369 int tmp0, tmp1;
370 int sign0 = 1;
371 int sign1 = 1;
372 const int16_t *tab0, *tab1;
373 int length = tctx->length[ftype][i >= tctx->length_change[ftype]];
374 int bitstream_second_part = (i >= tctx->bits_main_spec_change[ftype]);
375
376 int bits = tctx->bits_main_spec[0][ftype][bitstream_second_part];
377 if (bits == 7) {
378 if (get_bits1(gb))
379 sign0 = -1;
380 bits = 6;
381 }
382 tmp0 = get_bits(gb, bits);
383
384 bits = tctx->bits_main_spec[1][ftype][bitstream_second_part];
385
386 if (bits == 7) {
387 if (get_bits1(gb))
388 sign1 = -1;
389
390 bits = 6;
391 }
392 tmp1 = get_bits(gb, bits);
393
394 tab0 = cb0 + tmp0*cb_len;
395 tab1 = cb1 + tmp1*cb_len;
396
bf8202f3 397 for (j = 0; j < length; j++)
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398 out[tctx->permut[ftype][pos+j]] = sign0*tab0[j] + sign1*tab1[j];
399
400 pos += length;
401 }
402
403}
404
405static inline float mulawinv(float y, float clip, float mu)
406{
407 y = av_clipf(y/clip, -1, 1);
408 return clip * FFSIGN(y) * (exp(log(1+mu) * fabs(y)) - 1) / mu;
409}
410
411/**
412 * Evaluate a*b/400 rounded to the nearest integer. When, for example,
413 * a*b == 200 and the nearest integer is ill-defined, use a table to emulate
414 * the following broken float-based implementation used by the binary decoder:
415 *
adbfc605 416 * @code
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417 * static int very_broken_op(int a, int b)
418 * {
419 * static float test; // Ugh, force gcc to do the division first...
420 *
421 * test = a/400.;
422 * return b * test + 0.5;
423 * }
adbfc605 424 * @endcode
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425 *
426 * @note if this function is replaced by just ROUNDED_DIV(a*b,400.), the stddev
427 * between the original file (before encoding with Yamaha encoder) and the
428 * decoded output increases, which leads one to believe that the encoder expects
429 * exactly this broken calculation.
430 */
431static int very_broken_op(int a, int b)
432{
433 int x = a*b + 200;
434 int size;
435 const uint8_t *rtab;
436
437 if (x%400 || b%5)
438 return x/400;
439
440 x /= 400;
441
442 size = tabs[b/5].size;
443 rtab = tabs[b/5].tab;
444 return x - rtab[size*av_log2(2*(x - 1)/size)+(x - 1)%size];
445}
446
447/**
448 * Sum to data a periodic peak of a given period, width and shape.
449 *
450 * @param period the period of the peak divised by 400.0
451 */
452static void add_peak(int period, int width, const float *shape,
453 float ppc_gain, float *speech, int len)
454{
455 int i, j;
456
457 const float *shape_end = shape + len;
458 int center;
459
460 // First peak centered around zero
bf8202f3 461 for (i = 0; i < width/2; i++)
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462 speech[i] += ppc_gain * *shape++;
463
bf8202f3 464 for (i = 1; i < ROUNDED_DIV(len,width) ; i++) {
7bd47335 465 center = very_broken_op(period, i);
bf8202f3 466 for (j = -width/2; j < (width+1)/2; j++)
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467 speech[j+center] += ppc_gain * *shape++;
468 }
469
470 // For the last block, be careful not to go beyond the end of the buffer
471 center = very_broken_op(period, i);
bf8202f3 472 for (j = -width/2; j < (width + 1)/2 && shape < shape_end; j++)
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473 speech[j+center] += ppc_gain * *shape++;
474}
475
476static void decode_ppc(TwinContext *tctx, int period_coef, const float *shape,
477 float ppc_gain, float *speech)
478{
479 const ModeTab *mtab = tctx->mtab;
480 int isampf = tctx->avctx->sample_rate/1000;
481 int ibps = tctx->avctx->bit_rate/(1000 * tctx->avctx->channels);
482 int min_period = ROUNDED_DIV( 40*2*mtab->size, isampf);
483 int max_period = ROUNDED_DIV(6*40*2*mtab->size, isampf);
484 int period_range = max_period - min_period;
485
486 // This is actually the period multiplied by 400. It is just linearly coded
487 // between its maximum and minimum value.
488 int period = min_period +
489 ROUNDED_DIV(period_coef*period_range, (1 << mtab->ppc_period_bit) - 1);
490 int width;
491
492 if (isampf == 22 && ibps == 32) {
493 // For some unknown reason, NTT decided to code this case differently...
494 width = ROUNDED_DIV((period + 800)* mtab->peak_per2wid, 400*mtab->size);
495 } else
496 width = (period )* mtab->peak_per2wid/(400*mtab->size);
497
498 add_peak(period, width, shape, ppc_gain, speech, mtab->ppc_shape_len);
499}
500
501static void dec_gain(TwinContext *tctx, GetBitContext *gb, enum FrameType ftype,
502 float *out)
503{
504 const ModeTab *mtab = tctx->mtab;
505 int i, j;
506 int sub = mtab->fmode[ftype].sub;
507 float step = AMP_MAX / ((1 << GAIN_BITS) - 1);
508 float sub_step = SUB_AMP_MAX / ((1 << SUB_GAIN_BITS) - 1);
509
510 if (ftype == FT_LONG) {
bf8202f3 511 for (i = 0; i < tctx->avctx->channels; i++)
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512 out[i] = (1./(1<<13)) *
513 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
514 AMP_MAX, MULAW_MU);
515 } else {
bf8202f3 516 for (i = 0; i < tctx->avctx->channels; i++) {
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517 float val = (1./(1<<23)) *
518 mulawinv(step * 0.5 + step * get_bits(gb, GAIN_BITS),
519 AMP_MAX, MULAW_MU);
520
bf8202f3 521 for (j = 0; j < sub; j++) {
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522 out[i*sub + j] =
523 val*mulawinv(sub_step* 0.5 +
524 sub_step* get_bits(gb, SUB_GAIN_BITS),
525 SUB_AMP_MAX, MULAW_MU);
526 }
527 }
528 }
529}
530
531/**
532 * Rearrange the LSP coefficients so that they have a minimum distance of
533 * min_dist. This function does it exactly as described in section of 3.2.4
534 * of the G.729 specification (but interestingly is different from what the
535 * reference decoder actually does).
536 */
537static void rearrange_lsp(int order, float *lsp, float min_dist)
538{
539 int i;
540 float min_dist2 = min_dist * 0.5;
bf8202f3 541 for (i = 1; i < order; i++)
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542 if (lsp[i] - lsp[i-1] < min_dist) {
543 float avg = (lsp[i] + lsp[i-1]) * 0.5;
544
545 lsp[i-1] = avg - min_dist2;
546 lsp[i ] = avg + min_dist2;
547 }
548}
549
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550static void decode_lsp(TwinContext *tctx, int lpc_idx1, uint8_t *lpc_idx2,
551 int lpc_hist_idx, float *lsp, float *hist)
552{
553 const ModeTab *mtab = tctx->mtab;
554 int i, j;
555
556 const float *cb = mtab->lspcodebook;
557 const float *cb2 = cb + (1 << mtab->lsp_bit1)*mtab->n_lsp;
558 const float *cb3 = cb2 + (1 << mtab->lsp_bit2)*mtab->n_lsp;
559
560 const int8_t funny_rounding[4] = {
561 -2,
562 mtab->lsp_split == 4 ? -2 : 1,
563 mtab->lsp_split == 4 ? -2 : 1,
564 0
565 };
566
bf8202f3
VS
567 j = 0;
568 for (i = 0; i < mtab->lsp_split; i++) {
7bd47335
VS
569 int chunk_end = ((i + 1)*mtab->n_lsp + funny_rounding[i])/mtab->lsp_split;
570 for (; j < chunk_end; j++)
571 lsp[j] = cb [lpc_idx1 * mtab->n_lsp + j] +
572 cb2[lpc_idx2[i] * mtab->n_lsp + j];
573 }
574
575 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
576
bf8202f3 577 for (i = 0; i < mtab->n_lsp; i++) {
7bd47335
VS
578 float tmp1 = 1. - cb3[lpc_hist_idx*mtab->n_lsp + i];
579 float tmp2 = hist[i] * cb3[lpc_hist_idx*mtab->n_lsp + i];
580 hist[i] = lsp[i];
581 lsp[i] = lsp[i] * tmp1 + tmp2;
582 }
583
584 rearrange_lsp(mtab->n_lsp, lsp, 0.0001);
585 rearrange_lsp(mtab->n_lsp, lsp, 0.000095);
419b2be8 586 ff_sort_nearly_sorted_floats(lsp, mtab->n_lsp);
7bd47335
VS
587}
588
589static void dec_lpc_spectrum_inv(TwinContext *tctx, float *lsp,
590 enum FrameType ftype, float *lpc)
591{
592 int i;
593 int size = tctx->mtab->size / tctx->mtab->fmode[ftype].sub;
594
bf8202f3 595 for (i = 0; i < tctx->mtab->n_lsp; i++)
7bd47335
VS
596 lsp[i] = 2*cos(lsp[i]);
597
598 switch (ftype) {
599 case FT_LONG:
600 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 8);
601 break;
602 case FT_MEDIUM:
603 eval_lpcenv_2parts(tctx, ftype, lsp, lpc, size, 2);
604 break;
605 case FT_SHORT:
606 eval_lpcenv(tctx, lsp, lpc);
607 break;
608 }
609}
610
611static void imdct_and_window(TwinContext *tctx, enum FrameType ftype, int wtype,
612 float *in, float *prev, int ch)
613{
26f548bb 614 FFTContext *mdct = &tctx->mdct_ctx[ftype];
7bd47335
VS
615 const ModeTab *mtab = tctx->mtab;
616 int bsize = mtab->size / mtab->fmode[ftype].sub;
617 int size = mtab->size;
618 float *buf1 = tctx->tmp_buf;
619 int j;
620 int wsize; // Window size
621 float *out = tctx->curr_frame + 2*ch*mtab->size;
622 float *out2 = out;
623 float *prev_buf;
624 int first_wsize;
625
626 static const uint8_t wtype_to_wsize[] = {0, 0, 2, 2, 2, 1, 0, 1, 1};
627 int types_sizes[] = {
628 mtab->size / mtab->fmode[FT_LONG ].sub,
629 mtab->size / mtab->fmode[FT_MEDIUM].sub,
630 mtab->size / (2*mtab->fmode[FT_SHORT ].sub),
631 };
632
633 wsize = types_sizes[wtype_to_wsize[wtype]];
634 first_wsize = wsize;
635 prev_buf = prev + (size - bsize)/2;
636
bf8202f3 637 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
7bd47335
VS
638 int sub_wtype = ftype == FT_MEDIUM ? 8 : wtype;
639
640 if (!j && wtype == 4)
641 sub_wtype = 4;
642 else if (j == mtab->fmode[ftype].sub-1 && wtype == 7)
643 sub_wtype = 7;
644
645 wsize = types_sizes[wtype_to_wsize[sub_wtype]];
646
26f548bb 647 mdct->imdct_half(mdct, buf1 + bsize*j, in + bsize*j);
7bd47335
VS
648
649 tctx->dsp.vector_fmul_window(out2,
650 prev_buf + (bsize-wsize)/2,
651 buf1 + bsize*j,
6776061b 652 ff_sine_windows[av_log2(wsize)],
7bd47335
VS
653 wsize/2);
654 out2 += wsize;
655
656 memcpy(out2, buf1 + bsize*j + wsize/2, (bsize - wsize/2)*sizeof(float));
657
658 out2 += ftype == FT_MEDIUM ? (bsize-wsize)/2 : bsize - wsize;
659
660 prev_buf = buf1 + bsize*j + bsize/2;
661 }
662
663 tctx->last_block_pos[ch] = (size + first_wsize)/2;
664}
665
666static void imdct_output(TwinContext *tctx, enum FrameType ftype, int wtype,
667 float *out)
668{
669 const ModeTab *mtab = tctx->mtab;
9d06037d 670 int size1, size2;
7bd47335 671 float *prev_buf = tctx->prev_frame + tctx->last_block_pos[0];
9d06037d 672 int i;
7bd47335 673
bf8202f3 674 for (i = 0; i < tctx->avctx->channels; i++) {
7bd47335
VS
675 imdct_and_window(tctx, ftype, wtype,
676 tctx->spectrum + i*mtab->size,
677 prev_buf + 2*i*mtab->size,
678 i);
679 }
680
0eea2129
JR
681 if (!out)
682 return;
683
9d06037d
JR
684 size2 = tctx->last_block_pos[0];
685 size1 = mtab->size - size2;
7bd47335 686 if (tctx->avctx->channels == 2) {
9d06037d
JR
687 tctx->dsp.butterflies_float_interleave(out, prev_buf,
688 &prev_buf[2*mtab->size],
689 size1);
690
691 out += 2 * size1;
692
693 tctx->dsp.butterflies_float_interleave(out, tctx->curr_frame,
694 &tctx->curr_frame[2*mtab->size],
695 size2);
7bd47335 696 } else {
9d06037d 697 memcpy(out, prev_buf, size1 * sizeof(*out));
7bd47335 698
9d06037d 699 out += size1;
7bd47335 700
9d06037d 701 memcpy(out, tctx->curr_frame, size2 * sizeof(*out));
7bd47335
VS
702 }
703
704}
705
706static void dec_bark_env(TwinContext *tctx, const uint8_t *in, int use_hist,
707 int ch, float *out, float gain, enum FrameType ftype)
708{
709 const ModeTab *mtab = tctx->mtab;
710 int i,j;
711 float *hist = tctx->bark_hist[ftype][ch];
712 float val = ((const float []) {0.4, 0.35, 0.28})[ftype];
713 int bark_n_coef = mtab->fmode[ftype].bark_n_coef;
714 int fw_cb_len = mtab->fmode[ftype].bark_env_size / bark_n_coef;
715 int idx = 0;
716
bf8202f3
VS
717 for (i = 0; i < fw_cb_len; i++)
718 for (j = 0; j < bark_n_coef; j++, idx++) {
7bd47335
VS
719 float tmp2 =
720 mtab->fmode[ftype].bark_cb[fw_cb_len*in[j] + i] * (1./4096);
721 float st = use_hist ?
722 (1. - val) * tmp2 + val*hist[idx] + 1. : tmp2 + 1.;
723
724 hist[idx] = tmp2;
725 if (st < -1.) st = 1.;
726
727 memset_float(out, st * gain, mtab->fmode[ftype].bark_tab[idx]);
728 out += mtab->fmode[ftype].bark_tab[idx];
729 }
730
731}
732
733static void read_and_decode_spectrum(TwinContext *tctx, GetBitContext *gb,
734 float *out, enum FrameType ftype)
735{
736 const ModeTab *mtab = tctx->mtab;
737 int channels = tctx->avctx->channels;
738 int sub = mtab->fmode[ftype].sub;
739 int block_size = mtab->size / sub;
becfe99a
MR
740 float gain[CHANNELS_MAX*SUBBLOCKS_MAX];
741 float ppc_shape[PPC_SHAPE_LEN_MAX * CHANNELS_MAX * 4];
742 uint8_t bark1[CHANNELS_MAX][SUBBLOCKS_MAX][BARK_N_COEF_MAX];
743 uint8_t bark_use_hist[CHANNELS_MAX][SUBBLOCKS_MAX];
7bd47335 744
becfe99a
MR
745 uint8_t lpc_idx1[CHANNELS_MAX];
746 uint8_t lpc_idx2[CHANNELS_MAX][LSP_SPLIT_MAX];
747 uint8_t lpc_hist_idx[CHANNELS_MAX];
7bd47335
VS
748
749 int i, j, k;
750
751 dequant(tctx, gb, out, ftype,
752 mtab->fmode[ftype].cb0, mtab->fmode[ftype].cb1,
753 mtab->fmode[ftype].cb_len_read);
754
bf8202f3
VS
755 for (i = 0; i < channels; i++)
756 for (j = 0; j < sub; j++)
757 for (k = 0; k < mtab->fmode[ftype].bark_n_coef; k++)
7bd47335
VS
758 bark1[i][j][k] =
759 get_bits(gb, mtab->fmode[ftype].bark_n_bit);
760
bf8202f3
VS
761 for (i = 0; i < channels; i++)
762 for (j = 0; j < sub; j++)
7bd47335
VS
763 bark_use_hist[i][j] = get_bits1(gb);
764
765 dec_gain(tctx, gb, ftype, gain);
766
bf8202f3 767 for (i = 0; i < channels; i++) {
7bd47335
VS
768 lpc_hist_idx[i] = get_bits(gb, tctx->mtab->lsp_bit0);
769 lpc_idx1 [i] = get_bits(gb, tctx->mtab->lsp_bit1);
770
bf8202f3 771 for (j = 0; j < tctx->mtab->lsp_split; j++)
7bd47335
VS
772 lpc_idx2[i][j] = get_bits(gb, tctx->mtab->lsp_bit2);
773 }
774
775 if (ftype == FT_LONG) {
776 int cb_len_p = (tctx->n_div[3] + mtab->ppc_shape_len*channels - 1)/
777 tctx->n_div[3];
778 dequant(tctx, gb, ppc_shape, FT_PPC, mtab->ppc_shape_cb,
779 mtab->ppc_shape_cb + cb_len_p*PPC_SHAPE_CB_SIZE, cb_len_p);
780 }
781
bf8202f3 782 for (i = 0; i < channels; i++) {
7bd47335 783 float *chunk = out + mtab->size * i;
becfe99a 784 float lsp[LSP_COEFS_MAX];
7bd47335 785
bf8202f3 786 for (j = 0; j < sub; j++) {
7bd47335
VS
787 dec_bark_env(tctx, bark1[i][j], bark_use_hist[i][j], i,
788 tctx->tmp_buf, gain[sub*i+j], ftype);
789
6eabb0d3 790 tctx->dsp.vector_fmul(chunk + block_size*j, chunk + block_size*j, tctx->tmp_buf,
7bd47335
VS
791 block_size);
792
793 }
794
795 if (ftype == FT_LONG) {
796 float pgain_step = 25000. / ((1 << mtab->pgain_bit) - 1);
797 int p_coef = get_bits(gb, tctx->mtab->ppc_period_bit);
798 int g_coef = get_bits(gb, tctx->mtab->pgain_bit);
799 float v = 1./8192*
800 mulawinv(pgain_step*g_coef+ pgain_step/2, 25000., PGAIN_MU);
801
802 decode_ppc(tctx, p_coef, ppc_shape + i*mtab->ppc_shape_len, v,
803 chunk);
804 }
805
806 decode_lsp(tctx, lpc_idx1[i], lpc_idx2[i], lpc_hist_idx[i], lsp,
807 tctx->lsp_hist[i]);
808
809 dec_lpc_spectrum_inv(tctx, lsp, ftype, tctx->tmp_buf);
810
bf8202f3 811 for (j = 0; j < mtab->fmode[ftype].sub; j++) {
6eabb0d3 812 tctx->dsp.vector_fmul(chunk, chunk, tctx->tmp_buf, block_size);
7bd47335
VS
813 chunk += block_size;
814 }
815 }
816}
817
818static int twin_decode_frame(AVCodecContext * avctx, void *data,
0eea2129 819 int *got_frame_ptr, AVPacket *avpkt)
7bd47335
VS
820{
821 const uint8_t *buf = avpkt->data;
822 int buf_size = avpkt->size;
823 TwinContext *tctx = avctx->priv_data;
824 GetBitContext gb;
825 const ModeTab *mtab = tctx->mtab;
0eea2129 826 float *out = NULL;
7bd47335 827 enum FrameType ftype;
0eea2129 828 int window_type, ret;
7bd47335
VS
829 static const enum FrameType wtype_to_ftype_table[] = {
830 FT_LONG, FT_LONG, FT_SHORT, FT_LONG,
831 FT_MEDIUM, FT_LONG, FT_LONG, FT_MEDIUM, FT_MEDIUM
832 };
833
834 if (buf_size*8 < avctx->bit_rate*mtab->size/avctx->sample_rate + 8) {
835 av_log(avctx, AV_LOG_ERROR,
836 "Frame too small (%d bytes). Truncated file?\n", buf_size);
5ed68178 837 return AVERROR(EINVAL);
7bd47335
VS
838 }
839
0eea2129
JR
840 /* get output buffer */
841 if (tctx->discarded_packets >= 2) {
842 tctx->frame.nb_samples = mtab->size;
843 if ((ret = avctx->get_buffer(avctx, &tctx->frame)) < 0) {
844 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
845 return ret;
846 }
847 out = (float *)tctx->frame.data[0];
e53eecd0
JR
848 }
849
7bd47335
VS
850 init_get_bits(&gb, buf, buf_size * 8);
851 skip_bits(&gb, get_bits(&gb, 8));
852 window_type = get_bits(&gb, WINDOW_TYPE_BITS);
853
854 if (window_type > 8) {
855 av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n");
856 return -1;
857 }
858
859 ftype = wtype_to_ftype_table[window_type];
860
861 read_and_decode_spectrum(tctx, &gb, tctx->spectrum, ftype);
862
863 imdct_output(tctx, ftype, window_type, out);
864
865 FFSWAP(float*, tctx->curr_frame, tctx->prev_frame);
866
0eea2129
JR
867 if (tctx->discarded_packets < 2) {
868 tctx->discarded_packets++;
869 *got_frame_ptr = 0;
7bd47335
VS
870 return buf_size;
871 }
872
0eea2129
JR
873 *got_frame_ptr = 1;
874 *(AVFrame *)data = tctx->frame;;
7bd47335
VS
875
876 return buf_size;
877}
878
879/**
880 * Init IMDCT and windowing tables
881 */
a8a6da4a 882static av_cold int init_mdct_win(TwinContext *tctx)
7bd47335 883{
a8a6da4a 884 int i, j, ret;
7bd47335
VS
885 const ModeTab *mtab = tctx->mtab;
886 int size_s = mtab->size / mtab->fmode[FT_SHORT].sub;
887 int size_m = mtab->size / mtab->fmode[FT_MEDIUM].sub;
888 int channels = tctx->avctx->channels;
889 float norm = channels == 1 ? 2. : 1.;
890
bf8202f3 891 for (i = 0; i < 3; i++) {
7bd47335 892 int bsize = tctx->mtab->size/tctx->mtab->fmode[i].sub;
a8a6da4a
JR
893 if ((ret = ff_mdct_init(&tctx->mdct_ctx[i], av_log2(bsize) + 1, 1,
894 -sqrt(norm/bsize) / (1<<15))))
895 return ret;
7bd47335
VS
896 }
897
a8a6da4a
JR
898 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->tmp_buf,
899 mtab->size * sizeof(*tctx->tmp_buf), alloc_fail);
7bd47335 900
a8a6da4a
JR
901 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->spectrum,
902 2 * mtab->size * channels * sizeof(*tctx->spectrum),
903 alloc_fail);
904 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->curr_frame,
905 2 * mtab->size * channels * sizeof(*tctx->curr_frame),
906 alloc_fail);
907 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->prev_frame,
908 2 * mtab->size * channels * sizeof(*tctx->prev_frame),
909 alloc_fail);
7bd47335 910
bf8202f3 911 for (i = 0; i < 3; i++) {
7bd47335
VS
912 int m = 4*mtab->size/mtab->fmode[i].sub;
913 double freq = 2*M_PI/m;
a8a6da4a
JR
914 FF_ALLOC_OR_GOTO(tctx->avctx, tctx->cos_tabs[i],
915 (m / 4) * sizeof(*tctx->cos_tabs[i]), alloc_fail);
7bd47335 916
bf8202f3 917 for (j = 0; j <= m/8; j++)
7bd47335 918 tctx->cos_tabs[i][j] = cos((2*j + 1)*freq);
bf8202f3 919 for (j = 1; j < m/8; j++)
7bd47335
VS
920 tctx->cos_tabs[i][m/4-j] = tctx->cos_tabs[i][j];
921 }
922
923
14b86070
RD
924 ff_init_ff_sine_windows(av_log2(size_m));
925 ff_init_ff_sine_windows(av_log2(size_s/2));
926 ff_init_ff_sine_windows(av_log2(mtab->size));
a8a6da4a
JR
927
928 return 0;
929alloc_fail:
930 return AVERROR(ENOMEM);
7bd47335
VS
931}
932
933/**
934 * Interpret the data as if it were a num_blocks x line_len[0] matrix and for
935 * each line do a cyclic permutation, i.e.
936 * abcdefghijklm -> defghijklmabc
937 * where the amount to be shifted is evaluated depending on the column.
938 */
939static void permutate_in_line(int16_t *tab, int num_vect, int num_blocks,
940 int block_size,
941 const uint8_t line_len[2], int length_div,
942 enum FrameType ftype)
943
944{
945 int i,j;
946
bf8202f3 947 for (i = 0; i < line_len[0]; i++) {
7bd47335
VS
948 int shift;
949
950 if (num_blocks == 1 ||
951 (ftype == FT_LONG && num_vect % num_blocks) ||
952 (ftype != FT_LONG && num_vect & 1 ) ||
953 i == line_len[1]) {
954 shift = 0;
955 } else if (ftype == FT_LONG) {
956 shift = i;
957 } else
958 shift = i*i;
959
bf8202f3 960 for (j = 0; j < num_vect && (j+num_vect*i < block_size*num_blocks); j++)
7bd47335
VS
961 tab[i*num_vect+j] = i*num_vect + (j + shift) % num_vect;
962 }
963}
964
965/**
966 * Interpret the input data as in the following table:
967 *
adbfc605 968 * @verbatim
7bd47335
VS
969 *
970 * abcdefgh
971 * ijklmnop
972 * qrstuvw
973 * x123456
974 *
adbfc605 975 * @endverbatim
7bd47335
VS
976 *
977 * and transpose it, giving the output
978 * aiqxbjr1cks2dlt3emu4fvn5gow6hp
979 */
980static void transpose_perm(int16_t *out, int16_t *in, int num_vect,
981 const uint8_t line_len[2], int length_div)
982{
983 int i,j;
984 int cont= 0;
bf8202f3
VS
985 for (i = 0; i < num_vect; i++)
986 for (j = 0; j < line_len[i >= length_div]; j++)
7bd47335
VS
987 out[cont++] = in[j*num_vect + i];
988}
989
990static void linear_perm(int16_t *out, int16_t *in, int n_blocks, int size)
991{
992 int block_size = size/n_blocks;
993 int i;
994
bf8202f3 995 for (i = 0; i < size; i++)
7bd47335
VS
996 out[i] = block_size * (in[i] % n_blocks) + in[i] / n_blocks;
997}
998
999static av_cold void construct_perm_table(TwinContext *tctx,enum FrameType ftype)
1000{
1001 int block_size;
1002 const ModeTab *mtab = tctx->mtab;
4bf2e7c5 1003 int size;
7bd47335
VS
1004 int16_t *tmp_perm = (int16_t *) tctx->tmp_buf;
1005
1006 if (ftype == FT_PPC) {
1007 size = tctx->avctx->channels;
1008 block_size = mtab->ppc_shape_len;
4bf2e7c5
MR
1009 } else {
1010 size = tctx->avctx->channels * mtab->fmode[ftype].sub;
7bd47335 1011 block_size = mtab->size / mtab->fmode[ftype].sub;
4bf2e7c5 1012 }
7bd47335
VS
1013
1014 permutate_in_line(tmp_perm, tctx->n_div[ftype], size,
1015 block_size, tctx->length[ftype],
1016 tctx->length_change[ftype], ftype);
1017
1018 transpose_perm(tctx->permut[ftype], tmp_perm, tctx->n_div[ftype],
1019 tctx->length[ftype], tctx->length_change[ftype]);
1020
1021 linear_perm(tctx->permut[ftype], tctx->permut[ftype], size,
1022 size*block_size);
1023}
1024
1025static av_cold void init_bitstream_params(TwinContext *tctx)
1026{
1027 const ModeTab *mtab = tctx->mtab;
1028 int n_ch = tctx->avctx->channels;
1029 int total_fr_bits = tctx->avctx->bit_rate*mtab->size/
1030 tctx->avctx->sample_rate;
1031
1032 int lsp_bits_per_block = n_ch*(mtab->lsp_bit0 + mtab->lsp_bit1 +
1033 mtab->lsp_split*mtab->lsp_bit2);
1034
1035 int ppc_bits = n_ch*(mtab->pgain_bit + mtab->ppc_shape_bit +
1036 mtab->ppc_period_bit);
1037
1038 int bsize_no_main_cb[3];
1039 int bse_bits[3];
1040 int i;
adadf26b 1041 enum FrameType frametype;
7bd47335 1042
bf8202f3 1043 for (i = 0; i < 3; i++)
7bd47335
VS
1044 // +1 for history usage switch
1045 bse_bits[i] = n_ch *
1046 (mtab->fmode[i].bark_n_coef * mtab->fmode[i].bark_n_bit + 1);
1047
1048 bsize_no_main_cb[2] = bse_bits[2] + lsp_bits_per_block + ppc_bits +
1049 WINDOW_TYPE_BITS + n_ch*GAIN_BITS;
1050
bf8202f3 1051 for (i = 0; i < 2; i++)
7bd47335
VS
1052 bsize_no_main_cb[i] =
1053 lsp_bits_per_block + n_ch*GAIN_BITS + WINDOW_TYPE_BITS +
1054 mtab->fmode[i].sub*(bse_bits[i] + n_ch*SUB_GAIN_BITS);
1055
1056 // The remaining bits are all used for the main spectrum coefficients
bf8202f3 1057 for (i = 0; i < 4; i++) {
7bd47335
VS
1058 int bit_size;
1059 int vect_size;
1060 int rounded_up, rounded_down, num_rounded_down, num_rounded_up;
1061 if (i == 3) {
1062 bit_size = n_ch * mtab->ppc_shape_bit;
1063 vect_size = n_ch * mtab->ppc_shape_len;
1064 } else {
1065 bit_size = total_fr_bits - bsize_no_main_cb[i];
1066 vect_size = n_ch * mtab->size;
1067 }
1068
1069 tctx->n_div[i] = (bit_size + 13) / 14;
1070
1071 rounded_up = (bit_size + tctx->n_div[i] - 1)/tctx->n_div[i];
1072 rounded_down = (bit_size )/tctx->n_div[i];
1073 num_rounded_down = rounded_up * tctx->n_div[i] - bit_size;
1074 num_rounded_up = tctx->n_div[i] - num_rounded_down;
1075 tctx->bits_main_spec[0][i][0] = (rounded_up + 1)/2;
1076 tctx->bits_main_spec[1][i][0] = (rounded_up )/2;
1077 tctx->bits_main_spec[0][i][1] = (rounded_down + 1)/2;
1078 tctx->bits_main_spec[1][i][1] = (rounded_down )/2;
1079 tctx->bits_main_spec_change[i] = num_rounded_up;
1080
1081 rounded_up = (vect_size + tctx->n_div[i] - 1)/tctx->n_div[i];
1082 rounded_down = (vect_size )/tctx->n_div[i];
1083 num_rounded_down = rounded_up * tctx->n_div[i] - vect_size;
1084 num_rounded_up = tctx->n_div[i] - num_rounded_down;
1085 tctx->length[i][0] = rounded_up;
1086 tctx->length[i][1] = rounded_down;
1087 tctx->length_change[i] = num_rounded_up;
1088 }
1089
adadf26b
CEH
1090 for (frametype = FT_SHORT; frametype <= FT_PPC; frametype++)
1091 construct_perm_table(tctx, frametype);
7bd47335
VS
1092}
1093
a8a6da4a
JR
1094static av_cold int twin_decode_close(AVCodecContext *avctx)
1095{
1096 TwinContext *tctx = avctx->priv_data;
1097 int i;
1098
1099 for (i = 0; i < 3; i++) {
1100 ff_mdct_end(&tctx->mdct_ctx[i]);
1101 av_free(tctx->cos_tabs[i]);
1102 }
1103
1104
1105 av_free(tctx->curr_frame);
1106 av_free(tctx->spectrum);
1107 av_free(tctx->prev_frame);
1108 av_free(tctx->tmp_buf);
1109
1110 return 0;
1111}
1112
7bd47335
VS
1113static av_cold int twin_decode_init(AVCodecContext *avctx)
1114{
a8a6da4a 1115 int ret;
7bd47335 1116 TwinContext *tctx = avctx->priv_data;
7b966566 1117 int isampf, ibps;
7bd47335
VS
1118
1119 tctx->avctx = avctx;
5d6e4c16 1120 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
7bd47335 1121
7b966566
JR
1122 if (!avctx->extradata || avctx->extradata_size < 12) {
1123 av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata\n");
1124 return AVERROR_INVALIDDATA;
1125 }
1126 avctx->channels = AV_RB32(avctx->extradata ) + 1;
1127 avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
1128 isampf = AV_RB32(avctx->extradata + 8);
1129 switch (isampf) {
1130 case 44: avctx->sample_rate = 44100; break;
1131 case 22: avctx->sample_rate = 22050; break;
1132 case 11: avctx->sample_rate = 11025; break;
1133 default: avctx->sample_rate = isampf * 1000; break;
1134 }
1135
becfe99a 1136 if (avctx->channels > CHANNELS_MAX) {
7bd47335
VS
1137 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
1138 avctx->channels);
1139 return -1;
1140 }
7b966566 1141 ibps = avctx->bit_rate / (1000 * avctx->channels);
7bd47335
VS
1142
1143 switch ((isampf << 8) + ibps) {
1144 case (8 <<8) + 8: tctx->mtab = &mode_08_08; break;
1145 case (11<<8) + 8: tctx->mtab = &mode_11_08; break;
1146 case (11<<8) + 10: tctx->mtab = &mode_11_10; break;
1147 case (16<<8) + 16: tctx->mtab = &mode_16_16; break;
1148 case (22<<8) + 20: tctx->mtab = &mode_22_20; break;
1149 case (22<<8) + 24: tctx->mtab = &mode_22_24; break;
1150 case (22<<8) + 32: tctx->mtab = &mode_22_32; break;
1151 case (44<<8) + 40: tctx->mtab = &mode_44_40; break;
1152 case (44<<8) + 48: tctx->mtab = &mode_44_48; break;
1153 default:
1154 av_log(avctx, AV_LOG_ERROR, "This version does not support %d kHz - %d kbit/s/ch mode.\n", isampf, isampf);
1155 return -1;
1156 }
1157
9cf0841e 1158 ff_dsputil_init(&tctx->dsp, avctx);
a8a6da4a
JR
1159 if ((ret = init_mdct_win(tctx))) {
1160 av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
1161 twin_decode_close(avctx);
1162 return ret;
1163 }
7bd47335
VS
1164 init_bitstream_params(tctx);
1165
1166 memset_float(tctx->bark_hist[0][0], 0.1, FF_ARRAY_ELEMS(tctx->bark_hist));
1167
0eea2129
JR
1168 avcodec_get_frame_defaults(&tctx->frame);
1169 avctx->coded_frame = &tctx->frame;
1170
7bd47335
VS
1171 return 0;
1172}
1173
86714887
DB
1174AVCodec ff_twinvq_decoder = {
1175 .name = "twinvq",
1176 .type = AVMEDIA_TYPE_AUDIO,
1177 .id = CODEC_ID_TWINVQ,
1178 .priv_data_size = sizeof(TwinContext),
1179 .init = twin_decode_init,
1180 .close = twin_decode_close,
1181 .decode = twin_decode_frame,
0eea2129 1182 .capabilities = CODEC_CAP_DR1,
86714887 1183 .long_name = NULL_IF_CONFIG_SMALL("VQF TwinVQ"),
7bd47335 1184};