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1/*
2 * On2 Audio for Video Codec decoder
3 *
4 * Copyright (c) 2013 Konstantin Shishkov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "libavutil/channel_layout.h"
24#include "libavutil/ffmath.h"
25#include "libavutil/float_dsp.h"
26#include "avcodec.h"
27#include "bytestream.h"
28#include "fft.h"
29#include "get_bits.h"
30#include "internal.h"
31
32#include "on2avcdata.h"
33
34#define ON2AVC_SUBFRAME_SIZE 1024
35
36enum WindowTypes {
37 WINDOW_TYPE_LONG = 0,
38 WINDOW_TYPE_LONG_STOP,
39 WINDOW_TYPE_LONG_START,
40 WINDOW_TYPE_8SHORT = 3,
41 WINDOW_TYPE_EXT4,
42 WINDOW_TYPE_EXT5,
43 WINDOW_TYPE_EXT6,
44 WINDOW_TYPE_EXT7,
45};
46
47typedef struct On2AVCContext {
48 AVCodecContext *avctx;
49 AVFloatDSPContext *fdsp;
50 FFTContext mdct, mdct_half, mdct_small;
51 FFTContext fft128, fft256, fft512, fft1024;
52 void (*wtf)(struct On2AVCContext *ctx, float *out, float *in, int size);
53
54 int is_av500;
55
56 const On2AVCMode *modes;
57 int window_type, prev_window_type;
58 int num_windows, num_bands;
59 int bits_per_section;
60 const int *band_start;
61
62 int grouping[8];
63 int ms_present;
64 int ms_info[ON2AVC_MAX_BANDS];
65
66 int is_long;
67
68 uint8_t band_type[ON2AVC_MAX_BANDS];
69 uint8_t band_run_end[ON2AVC_MAX_BANDS];
70 int num_sections;
71
72 float band_scales[ON2AVC_MAX_BANDS];
73
74 VLC scale_diff;
75 VLC cb_vlc[16];
76
77 float scale_tab[128];
78
79 DECLARE_ALIGNED(32, float, coeffs)[2][ON2AVC_SUBFRAME_SIZE];
80 DECLARE_ALIGNED(32, float, delay) [2][ON2AVC_SUBFRAME_SIZE];
81
82 DECLARE_ALIGNED(32, float, temp) [ON2AVC_SUBFRAME_SIZE * 2];
83 DECLARE_ALIGNED(32, float, mdct_buf) [ON2AVC_SUBFRAME_SIZE];
84 DECLARE_ALIGNED(32, float, long_win) [ON2AVC_SUBFRAME_SIZE];
85 DECLARE_ALIGNED(32, float, short_win)[ON2AVC_SUBFRAME_SIZE / 8];
86} On2AVCContext;
87
88static void on2avc_read_ms_info(On2AVCContext *c, GetBitContext *gb)
89{
90 int w, b, band_off = 0;
91
92 c->ms_present = get_bits1(gb);
93 if (!c->ms_present)
94 return;
95 for (w = 0; w < c->num_windows; w++) {
96 if (!c->grouping[w]) {
97 memcpy(c->ms_info + band_off,
98 c->ms_info + band_off - c->num_bands,
99 c->num_bands * sizeof(*c->ms_info));
100 band_off += c->num_bands;
101 continue;
102 }
103 for (b = 0; b < c->num_bands; b++)
104 c->ms_info[band_off++] = get_bits1(gb);
105 }
106}
107
108// do not see Table 17 in ISO/IEC 13818-7
109static int on2avc_decode_band_types(On2AVCContext *c, GetBitContext *gb)
110{
111 int bits_per_sect = c->is_long ? 5 : 3;
112 int esc_val = (1 << bits_per_sect) - 1;
113 int num_bands = c->num_bands * c->num_windows;
114 int band = 0, i, band_type, run_len, run;
115
116 while (band < num_bands) {
117 band_type = get_bits(gb, 4);
118 run_len = 1;
119 do {
120 run = get_bits(gb, bits_per_sect);
121 if (run > num_bands - band - run_len) {
122 av_log(c->avctx, AV_LOG_ERROR, "Invalid band type run\n");
123 return AVERROR_INVALIDDATA;
124 }
125 run_len += run;
126 } while (run == esc_val);
127 for (i = band; i < band + run_len; i++) {
128 c->band_type[i] = band_type;
129 c->band_run_end[i] = band + run_len;
130 }
131 band += run_len;
132 }
133
134 return 0;
135}
136
137// completely not like Table 18 in ISO/IEC 13818-7
138// (no intensity stereo, different coding for the first coefficient)
139static int on2avc_decode_band_scales(On2AVCContext *c, GetBitContext *gb)
140{
141 int w, w2, b, scale, first = 1;
142 int band_off = 0;
143
144 for (w = 0; w < c->num_windows; w++) {
145 if (!c->grouping[w]) {
146 memcpy(c->band_scales + band_off,
147 c->band_scales + band_off - c->num_bands,
148 c->num_bands * sizeof(*c->band_scales));
149 band_off += c->num_bands;
150 continue;
151 }
152 for (b = 0; b < c->num_bands; b++) {
153 if (!c->band_type[band_off]) {
154 int all_zero = 1;
155 for (w2 = w + 1; w2 < c->num_windows; w2++) {
156 if (c->grouping[w2])
157 break;
158 if (c->band_type[w2 * c->num_bands + b]) {
159 all_zero = 0;
160 break;
161 }
162 }
163 if (all_zero) {
164 c->band_scales[band_off++] = 0;
165 continue;
166 }
167 }
168 if (first) {
169 scale = get_bits(gb, 7);
170 first = 0;
171 } else {
172 scale += get_vlc2(gb, c->scale_diff.table, 9, 3) - 60;
173 }
174 if (scale < 0 || scale > 127) {
175 av_log(c->avctx, AV_LOG_ERROR, "Invalid scale value %d\n",
176 scale);
177 return AVERROR_INVALIDDATA;
178 }
179 c->band_scales[band_off++] = c->scale_tab[scale];
180 }
181 }
182
183 return 0;
184}
185
186static inline float on2avc_scale(int v, float scale)
187{
188 return v * sqrtf(abs(v)) * scale;
189}
190
191// spectral data is coded completely differently - there are no unsigned codebooks
192static int on2avc_decode_quads(On2AVCContext *c, GetBitContext *gb, float *dst,
193 int dst_size, int type, float band_scale)
194{
195 int i, j, val, val1;
196
197 for (i = 0; i < dst_size; i += 4) {
198 val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
199
200 for (j = 0; j < 4; j++) {
201 val1 = sign_extend((val >> (12 - j * 4)) & 0xF, 4);
202 *dst++ = on2avc_scale(val1, band_scale);
203 }
204 }
205
206 return 0;
207}
208
209static inline int get_egolomb(GetBitContext *gb)
210{
211 int v = 4;
212
213 while (get_bits1(gb)) {
214 v++;
215 if (v > 30) {
216 av_log(NULL, AV_LOG_WARNING, "Too large golomb code in get_egolomb.\n");
217 v = 30;
218 break;
219 }
220 }
221
222 return (1 << v) + get_bits_long(gb, v);
223}
224
225static int on2avc_decode_pairs(On2AVCContext *c, GetBitContext *gb, float *dst,
226 int dst_size, int type, float band_scale)
227{
228 int i, val, val1, val2, sign;
229
230 for (i = 0; i < dst_size; i += 2) {
231 val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
232
233 val1 = sign_extend(val >> 8, 8);
234 val2 = sign_extend(val & 0xFF, 8);
235 if (type == ON2AVC_ESC_CB) {
236 if (val1 <= -16 || val1 >= 16) {
237 sign = 1 - (val1 < 0) * 2;
238 val1 = sign * get_egolomb(gb);
239 }
240 if (val2 <= -16 || val2 >= 16) {
241 sign = 1 - (val2 < 0) * 2;
242 val2 = sign * get_egolomb(gb);
243 }
244 }
245
246 *dst++ = on2avc_scale(val1, band_scale);
247 *dst++ = on2avc_scale(val2, band_scale);
248 }
249
250 return 0;
251}
252
253static int on2avc_read_channel_data(On2AVCContext *c, GetBitContext *gb, int ch)
254{
255 int ret;
256 int w, b, band_idx;
257 float *coeff_ptr;
258
259 if ((ret = on2avc_decode_band_types(c, gb)) < 0)
260 return ret;
261 if ((ret = on2avc_decode_band_scales(c, gb)) < 0)
262 return ret;
263
264 coeff_ptr = c->coeffs[ch];
265 band_idx = 0;
266 memset(coeff_ptr, 0, ON2AVC_SUBFRAME_SIZE * sizeof(*coeff_ptr));
267 for (w = 0; w < c->num_windows; w++) {
268 for (b = 0; b < c->num_bands; b++) {
269 int band_size = c->band_start[b + 1] - c->band_start[b];
270 int band_type = c->band_type[band_idx + b];
271
272 if (!band_type) {
273 coeff_ptr += band_size;
274 continue;
275 }
276 if (band_type < 9)
277 on2avc_decode_quads(c, gb, coeff_ptr, band_size, band_type,
278 c->band_scales[band_idx + b]);
279 else
280 on2avc_decode_pairs(c, gb, coeff_ptr, band_size, band_type,
281 c->band_scales[band_idx + b]);
282 coeff_ptr += band_size;
283 }
284 band_idx += c->num_bands;
285 }
286
287 return 0;
288}
289
290static int on2avc_apply_ms(On2AVCContext *c)
291{
292 int w, b, i;
293 int band_off = 0;
294 float *ch0 = c->coeffs[0];
295 float *ch1 = c->coeffs[1];
296
297 for (w = 0; w < c->num_windows; w++) {
298 for (b = 0; b < c->num_bands; b++) {
299 if (c->ms_info[band_off + b]) {
300 for (i = c->band_start[b]; i < c->band_start[b + 1]; i++) {
301 float l = *ch0, r = *ch1;
302 *ch0++ = l + r;
303 *ch1++ = l - r;
304 }
305 } else {
306 ch0 += c->band_start[b + 1] - c->band_start[b];
307 ch1 += c->band_start[b + 1] - c->band_start[b];
308 }
309 }
310 band_off += c->num_bands;
311 }
312 return 0;
313}
314
315static void zero_head_and_tail(float *src, int len, int order0, int order1)
316{
317 memset(src, 0, sizeof(*src) * order0);
318 memset(src + len - order1, 0, sizeof(*src) * order1);
319}
320
321static void pretwiddle(float *src, float *dst, int dst_len, int tab_step,
322 int step, int order0, int order1, const double * const *tabs)
323{
324 float *src2, *out;
325 const double *tab;
326 int i, j;
327
328 out = dst;
329 tab = tabs[0];
330 for (i = 0; i < tab_step; i++) {
331 double sum = 0;
332 for (j = 0; j < order0; j++)
333 sum += src[j] * tab[j * tab_step + i];
334 out[i] += sum;
335 }
336
337 out = dst + dst_len - tab_step;
338 tab = tabs[order0];
339 src2 = src + (dst_len - tab_step) / step + 1 + order0;
340 for (i = 0; i < tab_step; i++) {
341 double sum = 0;
342 for (j = 0; j < order1; j++)
343 sum += src2[j] * tab[j * tab_step + i];
344 out[i] += sum;
345 }
346}
347
348static void twiddle(float *src1, float *src2, int src2_len,
349 const double *tab, int tab_len, int step,
350 int order0, int order1, const double * const *tabs)
351{
352 int steps;
353 int mask;
354 int i, j;
355
356 steps = (src2_len - tab_len) / step + 1;
357 pretwiddle(src1, src2, src2_len, tab_len, step, order0, order1, tabs);
358 mask = tab_len - 1;
359
360 for (i = 0; i < steps; i++) {
361 float in0 = src1[order0 + i];
362 int pos = (src2_len - 1) & mask;
363
364 if (pos < tab_len) {
365 const double *t = tab;
366 for (j = pos; j >= 0; j--)
367 src2[j] += in0 * *t++;
368 for (j = 0; j < tab_len - pos - 1; j++)
369 src2[src2_len - j - 1] += in0 * tab[pos + 1 + j];
370 } else {
371 for (j = 0; j < tab_len; j++)
372 src2[pos - j] += in0 * tab[j];
373 }
374 mask = pos + step;
375 }
376}
377
378#define CMUL1_R(s, t, is, it) \
379 s[is + 0] * t[it + 0] - s[is + 1] * t[it + 1]
380#define CMUL1_I(s, t, is, it) \
381 s[is + 0] * t[it + 1] + s[is + 1] * t[it + 0]
382#define CMUL2_R(s, t, is, it) \
383 s[is + 0] * t[it + 0] + s[is + 1] * t[it + 1]
384#define CMUL2_I(s, t, is, it) \
385 s[is + 0] * t[it + 1] - s[is + 1] * t[it + 0]
386
387#define CMUL0(dst, id, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
388 dst[id] = s0[is] * t0[it] + s1[is] * t1[it] \
389 + s2[is] * t2[it] + s3[is] * t3[it]; \
390 dst[id + 1] = s0[is] * t0[it + 1] + s1[is] * t1[it + 1] \
391 + s2[is] * t2[it + 1] + s3[is] * t3[it + 1];
392
393#define CMUL1(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
394 *dst++ = CMUL1_R(s0, t0, is, it) \
395 + CMUL1_R(s1, t1, is, it) \
396 + CMUL1_R(s2, t2, is, it) \
397 + CMUL1_R(s3, t3, is, it); \
398 *dst++ = CMUL1_I(s0, t0, is, it) \
399 + CMUL1_I(s1, t1, is, it) \
400 + CMUL1_I(s2, t2, is, it) \
401 + CMUL1_I(s3, t3, is, it);
402
403#define CMUL2(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
404 *dst++ = CMUL2_R(s0, t0, is, it) \
405 + CMUL2_R(s1, t1, is, it) \
406 + CMUL2_R(s2, t2, is, it) \
407 + CMUL2_R(s3, t3, is, it); \
408 *dst++ = CMUL2_I(s0, t0, is, it) \
409 + CMUL2_I(s1, t1, is, it) \
410 + CMUL2_I(s2, t2, is, it) \
411 + CMUL2_I(s3, t3, is, it);
412
413static void combine_fft(float *s0, float *s1, float *s2, float *s3, float *dst,
414 const float *t0, const float *t1,
415 const float *t2, const float *t3, int len, int step)
416{
417 const float *h0, *h1, *h2, *h3;
418 float *d1, *d2;
419 int tmp, half;
420 int len2 = len >> 1, len4 = len >> 2;
421 int hoff;
422 int i, j, k;
423
424 tmp = step;
425 for (half = len2; tmp > 1; half <<= 1, tmp >>= 1);
426
427 h0 = t0 + half;
428 h1 = t1 + half;
429 h2 = t2 + half;
430 h3 = t3 + half;
431
432 CMUL0(dst, 0, s0, s1, s2, s3, t0, t1, t2, t3, 0, 0);
433
434 hoff = 2 * step * (len4 >> 1);
435
436 j = 2;
437 k = 2 * step;
438 d1 = dst + 2;
439 d2 = dst + 2 + (len >> 1);
440 for (i = 0; i < (len4 - 1) >> 1; i++) {
441 CMUL1(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
442 CMUL1(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
443 j += 2;
444 k += 2 * step;
445 }
446 CMUL0(dst, len4, s0, s1, s2, s3, t0, t1, t2, t3, 1, hoff);
447 CMUL0(dst, len4 + len2, s0, s1, s2, s3, h0, h1, h2, h3, 1, hoff);
448
449 j = len4;
450 k = hoff + 2 * step * len4;
451 d1 = dst + len4 + 2;
452 d2 = dst + len4 + 2 + len2;
453 for (i = 0; i < (len4 - 2) >> 1; i++) {
454 CMUL2(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
455 CMUL2(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
456 j -= 2;
457 k += 2 * step;
458 }
459 CMUL0(dst, len2 + 4, s0, s1, s2, s3, t0, t1, t2, t3, 0, k);
460}
461
462static void wtf_end_512(On2AVCContext *c, float *out, float *src,
463 float *tmp0, float *tmp1)
464{
465 memcpy(src, tmp0, 384 * sizeof(*tmp0));
466 memcpy(tmp0 + 384, src + 384, 128 * sizeof(*tmp0));
467
468 zero_head_and_tail(src, 128, 16, 4);
469 zero_head_and_tail(src + 128, 128, 16, 4);
470 zero_head_and_tail(src + 256, 128, 13, 7);
471 zero_head_and_tail(src + 384, 128, 15, 5);
472
473 c->fft128.fft_permute(&c->fft128, (FFTComplex*)src);
474 c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 128));
475 c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 256));
476 c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 384));
477 c->fft128.fft_calc(&c->fft128, (FFTComplex*)src);
478 c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 128));
479 c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 256));
480 c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 384));
481 combine_fft(src, src + 128, src + 256, src + 384, tmp1,
482 ff_on2avc_ctab_1, ff_on2avc_ctab_2,
483 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 512, 2);
484 c->fft512.fft_permute(&c->fft512, (FFTComplex*)tmp1);
485 c->fft512.fft_calc(&c->fft512, (FFTComplex*)tmp1);
486
487 pretwiddle(&tmp0[ 0], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
488 pretwiddle(&tmp0[128], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
489 pretwiddle(&tmp0[256], tmp1, 512, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
490 pretwiddle(&tmp0[384], tmp1, 512, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
491
492 memcpy(src, tmp1, 512 * sizeof(float));
493}
494
495static void wtf_end_1024(On2AVCContext *c, float *out, float *src,
496 float *tmp0, float *tmp1)
497{
498 memcpy(src, tmp0, 768 * sizeof(*tmp0));
499 memcpy(tmp0 + 768, src + 768, 256 * sizeof(*tmp0));
500
501 zero_head_and_tail(src, 256, 16, 4);
502 zero_head_and_tail(src + 256, 256, 16, 4);
503 zero_head_and_tail(src + 512, 256, 13, 7);
504 zero_head_and_tail(src + 768, 256, 15, 5);
505
506 c->fft256.fft_permute(&c->fft256, (FFTComplex*)src);
507 c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 256));
508 c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 512));
509 c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 768));
510 c->fft256.fft_calc(&c->fft256, (FFTComplex*)src);
511 c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 256));
512 c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 512));
513 c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 768));
514 combine_fft(src, src + 256, src + 512, src + 768, tmp1,
515 ff_on2avc_ctab_1, ff_on2avc_ctab_2,
516 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 1024, 1);
517 c->fft1024.fft_permute(&c->fft1024, (FFTComplex*)tmp1);
518 c->fft1024.fft_calc(&c->fft1024, (FFTComplex*)tmp1);
519
520 pretwiddle(&tmp0[ 0], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
521 pretwiddle(&tmp0[256], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
522 pretwiddle(&tmp0[512], tmp1, 1024, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
523 pretwiddle(&tmp0[768], tmp1, 1024, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
524
525 memcpy(src, tmp1, 1024 * sizeof(float));
526}
527
528static void wtf_40(On2AVCContext *c, float *out, float *src, int size)
529{
530 float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
531
532 memset(tmp0, 0, sizeof(*tmp0) * 1024);
533 memset(tmp1, 0, sizeof(*tmp1) * 1024);
534
535 if (size == 512) {
536 twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
537 twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
538 twiddle(src + 16, &tmp0[ 16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
539 twiddle(src + 24, &tmp0[ 16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
540 twiddle(src + 32, &tmp0[ 32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
541 twiddle(src + 40, &tmp0[ 32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
542 twiddle(src + 48, &tmp0[ 48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
543 twiddle(src + 56, &tmp0[ 48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
544 twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
545 twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
546 twiddle(&tmp0[32], &tmp1[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
547 twiddle(&tmp0[48], &tmp1[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
548 twiddle(src + 64, &tmp1[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
549 twiddle(src + 80, &tmp1[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
550 twiddle(src + 96, &tmp1[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
551 twiddle(src + 112, &tmp1[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
552 twiddle(src + 128, &tmp1[128], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
553 twiddle(src + 144, &tmp1[128], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
554 twiddle(src + 160, &tmp1[160], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
555 twiddle(src + 176, &tmp1[160], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
556
557 memset(tmp0, 0, 64 * sizeof(*tmp0));
558
559 twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
560 twiddle(&tmp1[ 32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
561 twiddle(&tmp1[ 64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
562 twiddle(&tmp1[ 96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
563 twiddle(&tmp1[128], &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
564 twiddle(&tmp1[160], &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
565 twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
566 twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
567 twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
568 twiddle(src + 288, &tmp0[256], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
569 twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
570 twiddle(src + 352, &tmp0[256], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
571
572 wtf_end_512(c, out, src, tmp0, tmp1);
573 } else {
574 twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
575 twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
576 twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
577 twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
578 twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
579 twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
580 twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
581 twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
582 twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
583 twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
584 twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
585 twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
586 twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
587 twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
588 twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
589 twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
590 twiddle(src + 256, &tmp1[256], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
591 twiddle(src + 288, &tmp1[256], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
592 twiddle(src + 320, &tmp1[320], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
593 twiddle(src + 352, &tmp1[320], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
594
595 memset(tmp0, 0, 128 * sizeof(*tmp0));
596
597 twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
598 twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
599 twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
600 twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
601 twiddle(&tmp1[256], &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
602 twiddle(&tmp1[320], &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
603 twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
604 twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
605 twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
606 twiddle(src + 576, &tmp0[512], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
607 twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
608 twiddle(src + 704, &tmp0[512], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
609
610 wtf_end_1024(c, out, src, tmp0, tmp1);
611 }
612}
613
614static void wtf_44(On2AVCContext *c, float *out, float *src, int size)
615{
616 float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
617
618 memset(tmp0, 0, sizeof(*tmp0) * 1024);
619 memset(tmp1, 0, sizeof(*tmp1) * 1024);
620
621 if (size == 512) {
622 twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
623 twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
624 twiddle(src + 16, &tmp0[16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
625 twiddle(src + 24, &tmp0[16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
626 twiddle(src + 32, &tmp0[32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
627 twiddle(src + 40, &tmp0[32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
628 twiddle(src + 48, &tmp0[48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
629 twiddle(src + 56, &tmp0[48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
630 twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
631 twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
632 twiddle(&tmp0[32], &tmp1[32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
633 twiddle(&tmp0[48], &tmp1[32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
634 twiddle(src + 64, &tmp1[64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
635 twiddle(src + 80, &tmp1[64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
636 twiddle(src + 96, &tmp1[96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
637 twiddle(src + 112, &tmp1[96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
638
639 memset(tmp0, 0, 64 * sizeof(*tmp0));
640
641 twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
642 twiddle(&tmp1[32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
643 twiddle(&tmp1[64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
644 twiddle(&tmp1[96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
645 twiddle(src + 128, &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
646 twiddle(src + 160, &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
647 twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
648 twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
649 twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
650 twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
651
652 wtf_end_512(c, out, src, tmp0, tmp1);
653 } else {
654 twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
655 twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
656 twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
657 twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
658 twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
659 twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
660 twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
661 twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
662 twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
663 twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
664 twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
665 twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
666 twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
667 twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
668 twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
669 twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
670
671 memset(tmp0, 0, 128 * sizeof(*tmp0));
672
673 twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
674 twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
675 twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
676 twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
677 twiddle(src + 256, &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
678 twiddle(src + 320, &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
679 twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
680 twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
681 twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
682 twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
683
684 wtf_end_1024(c, out, src, tmp0, tmp1);
685 }
686}
687
688static int on2avc_reconstruct_channel_ext(On2AVCContext *c, AVFrame *dst, int offset)
689{
690 int ch, i;
691
692 for (ch = 0; ch < c->avctx->channels; ch++) {
693 float *out = (float*)dst->extended_data[ch] + offset;
694 float *in = c->coeffs[ch];
695 float *saved = c->delay[ch];
696 float *buf = c->mdct_buf;
697 float *wout = out + 448;
698
699 switch (c->window_type) {
700 case WINDOW_TYPE_EXT7:
701 c->mdct.imdct_half(&c->mdct, buf, in);
702 break;
703 case WINDOW_TYPE_EXT4:
704 c->wtf(c, buf, in, 1024);
705 break;
706 case WINDOW_TYPE_EXT5:
707 c->wtf(c, buf, in, 512);
708 c->mdct.imdct_half(&c->mdct_half, buf + 512, in + 512);
709 for (i = 0; i < 256; i++) {
710 FFSWAP(float, buf[i + 512], buf[1023 - i]);
711 }
712 break;
713 case WINDOW_TYPE_EXT6:
714 c->mdct.imdct_half(&c->mdct_half, buf, in);
715 for (i = 0; i < 256; i++) {
716 FFSWAP(float, buf[i], buf[511 - i]);
717 }
718 c->wtf(c, buf + 512, in + 512, 512);
719 break;
720 }
721
722 memcpy(out, saved, 448 * sizeof(float));
723 c->fdsp->vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
724 memcpy(wout + 128, buf + 64, 448 * sizeof(float));
725 memcpy(saved, buf + 512, 448 * sizeof(float));
726 memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
727 }
728
729 return 0;
730}
731
732// not borrowed from aacdec.c - the codec has original design after all
733static int on2avc_reconstruct_channel(On2AVCContext *c, int channel,
734 AVFrame *dst, int offset)
735{
736 int i;
737 float *out = (float*)dst->extended_data[channel] + offset;
738 float *in = c->coeffs[channel];
739 float *saved = c->delay[channel];
740 float *buf = c->mdct_buf;
741 float *temp = c->temp;
742
743 switch (c->window_type) {
744 case WINDOW_TYPE_LONG_START:
745 case WINDOW_TYPE_LONG_STOP:
746 case WINDOW_TYPE_LONG:
747 c->mdct.imdct_half(&c->mdct, buf, in);
748 break;
749 case WINDOW_TYPE_8SHORT:
750 for (i = 0; i < ON2AVC_SUBFRAME_SIZE; i += ON2AVC_SUBFRAME_SIZE / 8)
751 c->mdct_small.imdct_half(&c->mdct_small, buf + i, in + i);
752 break;
753 }
754
755 if ((c->prev_window_type == WINDOW_TYPE_LONG ||
756 c->prev_window_type == WINDOW_TYPE_LONG_STOP) &&
757 (c->window_type == WINDOW_TYPE_LONG ||
758 c->window_type == WINDOW_TYPE_LONG_START)) {
759 c->fdsp->vector_fmul_window(out, saved, buf, c->long_win, 512);
760 } else {
761 float *wout = out + 448;
762 memcpy(out, saved, 448 * sizeof(float));
763
764 if (c->window_type == WINDOW_TYPE_8SHORT) {
765 c->fdsp->vector_fmul_window(wout + 0*128, saved + 448, buf + 0*128, c->short_win, 64);
766 c->fdsp->vector_fmul_window(wout + 1*128, buf + 0*128 + 64, buf + 1*128, c->short_win, 64);
767 c->fdsp->vector_fmul_window(wout + 2*128, buf + 1*128 + 64, buf + 2*128, c->short_win, 64);
768 c->fdsp->vector_fmul_window(wout + 3*128, buf + 2*128 + 64, buf + 3*128, c->short_win, 64);
769 c->fdsp->vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, c->short_win, 64);
770 memcpy(wout + 4*128, temp, 64 * sizeof(float));
771 } else {
772 c->fdsp->vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
773 memcpy(wout + 128, buf + 64, 448 * sizeof(float));
774 }
775 }
776
777 // buffer update
778 switch (c->window_type) {
779 case WINDOW_TYPE_8SHORT:
780 memcpy(saved, temp + 64, 64 * sizeof(float));
781 c->fdsp->vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, c->short_win, 64);
782 c->fdsp->vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, c->short_win, 64);
783 c->fdsp->vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, c->short_win, 64);
784 memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
785 break;
786 case WINDOW_TYPE_LONG_START:
787 memcpy(saved, buf + 512, 448 * sizeof(float));
788 memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
789 break;
790 case WINDOW_TYPE_LONG_STOP:
791 case WINDOW_TYPE_LONG:
792 memcpy(saved, buf + 512, 512 * sizeof(float));
793 break;
794 }
795 return 0;
796}
797
798static int on2avc_decode_subframe(On2AVCContext *c, const uint8_t *buf,
799 int buf_size, AVFrame *dst, int offset)
800{
801 GetBitContext gb;
802 int i, ret;
803
804 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
805 return ret;
806
807 if (get_bits1(&gb)) {
808 av_log(c->avctx, AV_LOG_ERROR, "enh bit set\n");
809 return AVERROR_INVALIDDATA;
810 }
811 c->prev_window_type = c->window_type;
812 c->window_type = get_bits(&gb, 3);
813
814 c->band_start = c->modes[c->window_type].band_start;
815 c->num_windows = c->modes[c->window_type].num_windows;
816 c->num_bands = c->modes[c->window_type].num_bands;
817 c->is_long = (c->window_type != WINDOW_TYPE_8SHORT);
818
819 c->grouping[0] = 1;
820 for (i = 1; i < c->num_windows; i++)
821 c->grouping[i] = !get_bits1(&gb);
822
823 on2avc_read_ms_info(c, &gb);
824 for (i = 0; i < c->avctx->channels; i++)
825 if ((ret = on2avc_read_channel_data(c, &gb, i)) < 0)
826 return AVERROR_INVALIDDATA;
827 if (c->avctx->channels == 2 && c->ms_present)
828 on2avc_apply_ms(c);
829 if (c->window_type < WINDOW_TYPE_EXT4) {
830 for (i = 0; i < c->avctx->channels; i++)
831 on2avc_reconstruct_channel(c, i, dst, offset);
832 } else {
833 on2avc_reconstruct_channel_ext(c, dst, offset);
834 }
835
836 return 0;
837}
838
839static int on2avc_decode_frame(AVCodecContext * avctx, void *data,
840 int *got_frame_ptr, AVPacket *avpkt)
841{
842 AVFrame *frame = data;
843 const uint8_t *buf = avpkt->data;
844 int buf_size = avpkt->size;
845 On2AVCContext *c = avctx->priv_data;
846 GetByteContext gb;
847 int num_frames = 0, frame_size, audio_off;
848 int ret;
849
850 if (c->is_av500) {
851 /* get output buffer */
852 frame->nb_samples = ON2AVC_SUBFRAME_SIZE;
853 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
854 return ret;
855
856 if ((ret = on2avc_decode_subframe(c, buf, buf_size, frame, 0)) < 0)
857 return ret;
858 } else {
859 bytestream2_init(&gb, buf, buf_size);
860 while (bytestream2_get_bytes_left(&gb) > 2) {
861 frame_size = bytestream2_get_le16(&gb);
862 if (!frame_size || frame_size > bytestream2_get_bytes_left(&gb)) {
863 av_log(avctx, AV_LOG_ERROR, "Invalid subframe size %d\n",
864 frame_size);
865 return AVERROR_INVALIDDATA;
866 }
867 num_frames++;
868 bytestream2_skip(&gb, frame_size);
869 }
870 if (!num_frames) {
871 av_log(avctx, AV_LOG_ERROR, "No subframes present\n");
872 return AVERROR_INVALIDDATA;
873 }
874
875 /* get output buffer */
876 frame->nb_samples = ON2AVC_SUBFRAME_SIZE * num_frames;
877 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
878 return ret;
879
880 audio_off = 0;
881 bytestream2_init(&gb, buf, buf_size);
882 while (bytestream2_get_bytes_left(&gb) > 2) {
883 frame_size = bytestream2_get_le16(&gb);
884 if ((ret = on2avc_decode_subframe(c, gb.buffer, frame_size,
885 frame, audio_off)) < 0)
886 return ret;
887 audio_off += ON2AVC_SUBFRAME_SIZE;
888 bytestream2_skip(&gb, frame_size);
889 }
890 }
891
892 *got_frame_ptr = 1;
893
894 return buf_size;
895}
896
897static av_cold void on2avc_free_vlcs(On2AVCContext *c)
898{
899 int i;
900
901 ff_free_vlc(&c->scale_diff);
902 for (i = 1; i < 16; i++)
903 ff_free_vlc(&c->cb_vlc[i]);
904}
905
906static av_cold int on2avc_decode_init(AVCodecContext *avctx)
907{
908 On2AVCContext *c = avctx->priv_data;
909 int i;
910
911 if (avctx->channels > 2U) {
912 avpriv_request_sample(avctx, "Decoding more than 2 channels");
913 return AVERROR_PATCHWELCOME;
914 }
915
916 c->avctx = avctx;
917 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
918 avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO
919 : AV_CH_LAYOUT_MONO;
920
921 c->is_av500 = (avctx->codec_tag == 0x500);
922
923 if (avctx->channels == 2)
924 av_log(avctx, AV_LOG_WARNING,
925 "Stereo mode support is not good, patch is welcome\n");
926
927 // We add -0.01 before ceil() to avoid any values to fall at exactly the
928 // midpoint between different ceil values. The results are identical to
929 // using pow(10, i / 10.0) without such bias
930 for (i = 0; i < 20; i++)
931 c->scale_tab[i] = ceil(ff_exp10(i * 0.1) * 16 - 0.01) / 32;
932 for (; i < 128; i++)
933 c->scale_tab[i] = ceil(ff_exp10(i * 0.1) * 0.5 - 0.01);
934
935 if (avctx->sample_rate < 32000 || avctx->channels == 1)
936 memcpy(c->long_win, ff_on2avc_window_long_24000,
937 1024 * sizeof(*c->long_win));
938 else
939 memcpy(c->long_win, ff_on2avc_window_long_32000,
940 1024 * sizeof(*c->long_win));
941 memcpy(c->short_win, ff_on2avc_window_short, 128 * sizeof(*c->short_win));
942
943 c->modes = (avctx->sample_rate <= 40000) ? ff_on2avc_modes_40
944 : ff_on2avc_modes_44;
945 c->wtf = (avctx->sample_rate <= 40000) ? wtf_40
946 : wtf_44;
947
948 ff_mdct_init(&c->mdct, 11, 1, 1.0 / (32768.0 * 1024.0));
949 ff_mdct_init(&c->mdct_half, 10, 1, 1.0 / (32768.0 * 512.0));
950 ff_mdct_init(&c->mdct_small, 8, 1, 1.0 / (32768.0 * 128.0));
951 ff_fft_init(&c->fft128, 6, 0);
952 ff_fft_init(&c->fft256, 7, 0);
953 ff_fft_init(&c->fft512, 8, 1);
954 ff_fft_init(&c->fft1024, 9, 1);
955 c->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
956 if (!c->fdsp)
957 return AVERROR(ENOMEM);
958
959 if (init_vlc(&c->scale_diff, 9, ON2AVC_SCALE_DIFFS,
960 ff_on2avc_scale_diff_bits, 1, 1,
961 ff_on2avc_scale_diff_codes, 4, 4, 0)) {
962 goto vlc_fail;
963 }
964 for (i = 1; i < 9; i++) {
965 int idx = i - 1;
966 if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_quad_cb_elems[idx],
967 ff_on2avc_quad_cb_bits[idx], 1, 1,
968 ff_on2avc_quad_cb_codes[idx], 4, 4,
969 ff_on2avc_quad_cb_syms[idx], 2, 2, 0)) {
970 goto vlc_fail;
971 }
972 }
973 for (i = 9; i < 16; i++) {
974 int idx = i - 9;
975 if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_pair_cb_elems[idx],
976 ff_on2avc_pair_cb_bits[idx], 1, 1,
977 ff_on2avc_pair_cb_codes[idx], 2, 2,
978 ff_on2avc_pair_cb_syms[idx], 2, 2, 0)) {
979 goto vlc_fail;
980 }
981 }
982
983 return 0;
984vlc_fail:
985 av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");
986 on2avc_free_vlcs(c);
987 av_freep(&c->fdsp);
988 return AVERROR(ENOMEM);
989}
990
991static av_cold int on2avc_decode_close(AVCodecContext *avctx)
992{
993 On2AVCContext *c = avctx->priv_data;
994
995 ff_mdct_end(&c->mdct);
996 ff_mdct_end(&c->mdct_half);
997 ff_mdct_end(&c->mdct_small);
998 ff_fft_end(&c->fft128);
999 ff_fft_end(&c->fft256);
1000 ff_fft_end(&c->fft512);
1001 ff_fft_end(&c->fft1024);
1002
1003 av_freep(&c->fdsp);
1004
1005 on2avc_free_vlcs(c);
1006
1007 return 0;
1008}
1009
1010
1011AVCodec ff_on2avc_decoder = {
1012 .name = "on2avc",
1013 .long_name = NULL_IF_CONFIG_SMALL("On2 Audio for Video Codec"),
1014 .type = AVMEDIA_TYPE_AUDIO,
1015 .id = AV_CODEC_ID_ON2AVC,
1016 .priv_data_size = sizeof(On2AVCContext),
1017 .init = on2avc_decode_init,
1018 .decode = on2avc_decode_frame,
1019 .close = on2avc_decode_close,
1020 .capabilities = AV_CODEC_CAP_DR1,
1021 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1022 AV_SAMPLE_FMT_NONE },
1023};
1024
generated by cgit at 2024-05-17 06:59:52 (GMT)