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on2avc.c
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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/float_dsp.h"
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "fft.h"
28 #include "get_bits.h"
29 #include "golomb.h"
30 #include "internal.h"
31 #include "unary.h"
32 
33 #include "on2avcdata.h"
34 
35 #define ON2AVC_SUBFRAME_SIZE 1024
36 
37 enum WindowTypes {
38  WINDOW_TYPE_LONG = 0,
39  WINDOW_TYPE_LONG_STOP,
40  WINDOW_TYPE_LONG_START,
41  WINDOW_TYPE_8SHORT = 3,
42  WINDOW_TYPE_EXT4,
43  WINDOW_TYPE_EXT5,
44  WINDOW_TYPE_EXT6,
45  WINDOW_TYPE_EXT7,
46 };
47 
48 typedef struct On2AVCContext {
49  AVCodecContext *avctx;
50  AVFloatDSPContext fdsp;
51  FFTContext mdct, mdct_half, mdct_small;
52  FFTContext fft128, fft256, fft512, fft1024;
53  void (*wtf)(struct On2AVCContext *ctx, float *out, float *in, int size);
54 
55  int is_av500;
56 
57  const On2AVCMode *modes;
58  int window_type, prev_window_type;
59  int num_windows, num_bands;
60  int bits_per_section;
61  const int *band_start;
62 
63  int grouping[8];
64  int ms_present;
65  int ms_info[ON2AVC_MAX_BANDS];
66 
67  int is_long;
68 
69  uint8_t band_type[ON2AVC_MAX_BANDS];
70  uint8_t band_run_end[ON2AVC_MAX_BANDS];
71  int num_sections;
72 
73  float band_scales[ON2AVC_MAX_BANDS];
74 
75  VLC scale_diff;
76  VLC cb_vlc[16];
77 
78  float scale_tab[128];
79 
80  DECLARE_ALIGNED(32, float, coeffs)[2][ON2AVC_SUBFRAME_SIZE];
81  DECLARE_ALIGNED(32, float, delay) [2][ON2AVC_SUBFRAME_SIZE];
82 
83  DECLARE_ALIGNED(32, float, temp) [ON2AVC_SUBFRAME_SIZE * 2];
84  DECLARE_ALIGNED(32, float, mdct_buf) [ON2AVC_SUBFRAME_SIZE];
85  DECLARE_ALIGNED(32, float, long_win) [ON2AVC_SUBFRAME_SIZE];
86  DECLARE_ALIGNED(32, float, short_win)[ON2AVC_SUBFRAME_SIZE / 8];
87 } On2AVCContext;
88 
89 static void on2avc_read_ms_info(On2AVCContext *c, GetBitContext *gb)
90 {
91  int w, b, band_off = 0;
92 
93  c->ms_present = get_bits1(gb);
94  if (!c->ms_present)
95  return;
96  for (w = 0; w < c->num_windows; w++) {
97  if (!c->grouping[w]) {
98  memcpy(c->ms_info + band_off,
99  c->ms_info + band_off - c->num_bands,
100  c->num_bands * sizeof(*c->ms_info));
101  band_off += c->num_bands;
102  continue;
103  }
104  for (b = 0; b < c->num_bands; b++)
105  c->ms_info[band_off++] = get_bits1(gb);
106  }
107 }
108 
109 // do not see Table 17 in ISO/IEC 13818-7
110 static int on2avc_decode_band_types(On2AVCContext *c, GetBitContext *gb)
111 {
112  int bits_per_sect = c->is_long ? 5 : 3;
113  int esc_val = (1 << bits_per_sect) - 1;
114  int num_bands = c->num_bands * c->num_windows;
115  int band = 0, i, band_type, run_len, run;
116 
117  while (band < num_bands) {
118  band_type = get_bits(gb, 4);
119  run_len = 1;
120  do {
121  run = get_bits(gb, bits_per_sect);
122  run_len += run;
123  } while (run == esc_val);
124  if (band + run_len > num_bands) {
125  av_log(c->avctx, AV_LOG_ERROR, "Invalid band type run\n");
126  return AVERROR_INVALIDDATA;
127  }
128  for (i = band; i < band + run_len; i++) {
129  c->band_type[i] = band_type;
130  c->band_run_end[i] = band + run_len;
131  }
132  band += run_len;
133  }
134 
135  return 0;
136 }
137 
138 // completely not like Table 18 in ISO/IEC 13818-7
139 // (no intensity stereo, different coding for the first coefficient)
140 static int on2avc_decode_band_scales(On2AVCContext *c, GetBitContext *gb)
141 {
142  int w, w2, b, scale, first = 1;
143  int band_off = 0;
144 
145  for (w = 0; w < c->num_windows; w++) {
146  if (!c->grouping[w]) {
147  memcpy(c->band_scales + band_off,
148  c->band_scales + band_off - c->num_bands,
149  c->num_bands * sizeof(*c->band_scales));
150  band_off += c->num_bands;
151  continue;
152  }
153  for (b = 0; b < c->num_bands; b++) {
154  if (!c->band_type[band_off]) {
155  int all_zero = 1;
156  for (w2 = w + 1; w2 < c->num_windows; w2++) {
157  if (c->grouping[w2])
158  break;
159  if (c->band_type[w2 * c->num_bands + b]) {
160  all_zero = 0;
161  break;
162  }
163  }
164  if (all_zero) {
165  c->band_scales[band_off++] = 0;
166  continue;
167  }
168  }
169  if (first) {
170  scale = get_bits(gb, 7);
171  first = 0;
172  } else {
173  scale += get_vlc2(gb, c->scale_diff.table, 9, 3) - 60;
174  }
175  if (scale < 0 || scale > 127) {
176  av_log(c->avctx, AV_LOG_ERROR, "Invalid scale value %d\n",
177  scale);
178  return AVERROR_INVALIDDATA;
179  }
180  c->band_scales[band_off++] = c->scale_tab[scale];
181  }
182  }
183 
184  return 0;
185 }
186 
187 static inline float on2avc_scale(int v, float scale)
188 {
189  return v * sqrtf(fabsf(v)) * scale;
190 }
191 
192 // spectral data is coded completely differently - there are no unsigned codebooks
193 static int on2avc_decode_quads(On2AVCContext *c, GetBitContext *gb, float *dst,
194  int dst_size, int type, float band_scale)
195 {
196  int i, j, val, val1;
197 
198  for (i = 0; i < dst_size; i += 4) {
199  val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
200 
201  for (j = 0; j < 4; j++) {
202  val1 = sign_extend((val >> (12 - j * 4)) & 0xF, 4);
203  *dst++ = on2avc_scale(val1, band_scale);
204  }
205  }
206 
207  return 0;
208 }
209 
210 static inline int get_egolomb(GetBitContext *gb)
211 {
212  int v = 4;
213 
214  while (get_bits1(gb)) v++;
215 
216  return (1 << v) + get_bits(gb, v);
217 }
218 
219 static int on2avc_decode_pairs(On2AVCContext *c, GetBitContext *gb, float *dst,
220  int dst_size, int type, float band_scale)
221 {
222  int i, val, val1, val2, sign;
223 
224  for (i = 0; i < dst_size; i += 2) {
225  val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
226 
227  val1 = sign_extend(val >> 8, 8);
228  val2 = sign_extend(val & 0xFF, 8);
229  if (type == ON2AVC_ESC_CB) {
230  if (val1 <= -16 || val1 >= 16) {
231  sign = 1 - (val1 < 0) * 2;
232  val1 = sign * get_egolomb(gb);
233  }
234  if (val2 <= -16 || val2 >= 16) {
235  sign = 1 - (val2 < 0) * 2;
236  val2 = sign * get_egolomb(gb);
237  }
238  }
239 
240  *dst++ = on2avc_scale(val1, band_scale);
241  *dst++ = on2avc_scale(val2, band_scale);
242  }
243 
244  return 0;
245 }
246 
247 static int on2avc_read_channel_data(On2AVCContext *c, GetBitContext *gb, int ch)
248 {
249  int ret;
250  int w, b, band_idx;
251  float *coeff_ptr;
252 
253  if ((ret = on2avc_decode_band_types(c, gb)) < 0)
254  return ret;
255  if ((ret = on2avc_decode_band_scales(c, gb)) < 0)
256  return ret;
257 
258  coeff_ptr = c->coeffs[ch];
259  band_idx = 0;
260  memset(coeff_ptr, 0, ON2AVC_SUBFRAME_SIZE * sizeof(*coeff_ptr));
261  for (w = 0; w < c->num_windows; w++) {
262  for (b = 0; b < c->num_bands; b++) {
263  int band_size = c->band_start[b + 1] - c->band_start[b];
264  int band_type = c->band_type[band_idx + b];
265 
266  if (!band_type) {
267  coeff_ptr += band_size;
268  continue;
269  }
270  if (band_type < 9)
271  on2avc_decode_quads(c, gb, coeff_ptr, band_size, band_type,
272  c->band_scales[band_idx + b]);
273  else
274  on2avc_decode_pairs(c, gb, coeff_ptr, band_size, band_type,
275  c->band_scales[band_idx + b]);
276  coeff_ptr += band_size;
277  }
278  band_idx += c->num_bands;
279  }
280 
281  return 0;
282 }
283 
284 static int on2avc_apply_ms(On2AVCContext *c)
285 {
286  int w, b, i;
287  int band_off = 0;
288  float *ch0 = c->coeffs[0];
289  float *ch1 = c->coeffs[1];
290 
291  for (w = 0; w < c->num_windows; w++) {
292  for (b = 0; b < c->num_bands; b++) {
293  if (c->ms_info[band_off + b]) {
294  for (i = c->band_start[b]; i < c->band_start[b + 1]; i++) {
295  float l = *ch0, r = *ch1;
296  *ch0++ = l + r;
297  *ch1++ = l - r;
298  }
299  } else {
300  ch0 += c->band_start[b + 1] - c->band_start[b];
301  ch1 += c->band_start[b + 1] - c->band_start[b];
302  }
303  }
304  band_off += c->num_bands;
305  }
306  return 0;
307 }
308 
309 static void zero_head_and_tail(float *src, int len, int order0, int order1)
310 {
311  memset(src, 0, sizeof(*src) * order0);
312  memset(src + len - order1, 0, sizeof(*src) * order1);
313 }
314 
315 static void pretwiddle(float *src, float *dst, int dst_len, int tab_step,
316  int step, int order0, int order1, const double * const *tabs)
317 {
318  float *src2, *out;
319  const double *tab;
320  int i, j;
321 
322  out = dst;
323  tab = tabs[0];
324  for (i = 0; i < tab_step; i++) {
325  double sum = 0;
326  for (j = 0; j < order0; j++)
327  sum += src[j] * tab[j * tab_step + i];
328  out[i] += sum;
329  }
330 
331  out = dst + dst_len - tab_step;
332  tab = tabs[order0];
333  src2 = src + (dst_len - tab_step) / step + 1 + order0;
334  for (i = 0; i < tab_step; i++) {
335  double sum = 0;
336  for (j = 0; j < order1; j++)
337  sum += src2[j] * tab[j * tab_step + i];
338  out[i] += sum;
339  }
340 }
341 
342 static void twiddle(float *src1, float *src2, int src2_len,
343  const double *tab, int tab_len, int step,
344  int order0, int order1, const double * const *tabs)
345 {
346  int steps;
347  int mask;
348  int i, j;
349 
350  steps = (src2_len - tab_len) / step + 1;
351  pretwiddle(src1, src2, src2_len, tab_len, step, order0, order1, tabs);
352  mask = tab_len - 1;
353 
354  for (i = 0; i < steps; i++) {
355  float in0 = src1[order0 + i];
356  int pos = (src2_len - 1) & mask;
357 
358  if (pos < tab_len) {
359  const double *t = tab;
360  for (j = pos; j >= 0; j--)
361  src2[j] += in0 * *t++;
362  for (j = 0; j < tab_len - pos - 1; j++)
363  src2[src2_len - j - 1] += in0 * tab[pos + 1 + j];
364  } else {
365  for (j = 0; j < tab_len; j++)
366  src2[pos - j] += in0 * tab[j];
367  }
368  mask = pos + step;
369  }
370 }
371 
372 #define CMUL1_R(s, t, is, it) \
373  s[is + 0] * t[it + 0] - s[is + 1] * t[it + 1]
374 #define CMUL1_I(s, t, is, it) \
375  s[is + 0] * t[it + 1] + s[is + 1] * t[it + 0]
376 #define CMUL2_R(s, t, is, it) \
377  s[is + 0] * t[it + 0] + s[is + 1] * t[it + 1]
378 #define CMUL2_I(s, t, is, it) \
379  s[is + 0] * t[it + 1] - s[is + 1] * t[it + 0]
380 
381 #define CMUL0(dst, id, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
382  dst[id] = s0[is] * t0[it] + s1[is] * t1[it] \
383  + s2[is] * t2[it] + s3[is] * t3[it]; \
384  dst[id + 1] = s0[is] * t0[it + 1] + s1[is] * t1[it + 1] \
385  + s2[is] * t2[it + 1] + s3[is] * t3[it + 1];
386 
387 #define CMUL1(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
388  *dst++ = CMUL1_R(s0, t0, is, it) \
389  + CMUL1_R(s1, t1, is, it) \
390  + CMUL1_R(s2, t2, is, it) \
391  + CMUL1_R(s3, t3, is, it); \
392  *dst++ = CMUL1_I(s0, t0, is, it) \
393  + CMUL1_I(s1, t1, is, it) \
394  + CMUL1_I(s2, t2, is, it) \
395  + CMUL1_I(s3, t3, is, it);
396 
397 #define CMUL2(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it) \
398  *dst++ = CMUL2_R(s0, t0, is, it) \
399  + CMUL2_R(s1, t1, is, it) \
400  + CMUL2_R(s2, t2, is, it) \
401  + CMUL2_R(s3, t3, is, it); \
402  *dst++ = CMUL2_I(s0, t0, is, it) \
403  + CMUL2_I(s1, t1, is, it) \
404  + CMUL2_I(s2, t2, is, it) \
405  + CMUL2_I(s3, t3, is, it);
406 
407 static void combine_fft(float *s0, float *s1, float *s2, float *s3, float *dst,
408  const float *t0, const float *t1,
409  const float *t2, const float *t3, int len, int step)
410 {
411  const float *h0, *h1, *h2, *h3;
412  float *d1, *d2;
413  int tmp, half;
414  int len2 = len >> 1, len4 = len >> 2;
415  int hoff;
416  int i, j, k;
417 
418  tmp = step;
419  for (half = len2; tmp > 1; half <<= 1, tmp >>= 1);
420 
421  h0 = t0 + half;
422  h1 = t1 + half;
423  h2 = t2 + half;
424  h3 = t3 + half;
425 
426  CMUL0(dst, 0, s0, s1, s2, s3, t0, t1, t2, t3, 0, 0);
427 
428  hoff = 2 * step * (len4 >> 1);
429 
430  j = 2;
431  k = 2 * step;
432  d1 = dst + 2;
433  d2 = dst + 2 + (len >> 1);
434  for (i = 0; i < (len4 - 1) >> 1; i++) {
435  CMUL1(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
436  CMUL1(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
437  j += 2;
438  k += 2 * step;
439  }
440  CMUL0(dst, len4, s0, s1, s2, s3, t0, t1, t2, t3, 1, hoff);
441  CMUL0(dst, len4 + len2, s0, s1, s2, s3, h0, h1, h2, h3, 1, hoff);
442 
443  j = len4;
444  k = hoff + 2 * step * len4;
445  d1 = dst + len4 + 2;
446  d2 = dst + len4 + 2 + len2;
447  for (i = 0; i < (len4 - 2) >> 1; i++) {
448  CMUL2(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);
449  CMUL2(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);
450  j -= 2;
451  k += 2 * step;
452  }
453  CMUL0(dst, len2 + 4, s0, s1, s2, s3, t0, t1, t2, t3, 0, k);
454 }
455 
456 static void wtf_end_512(On2AVCContext *c, float *out, float *src,
457  float *tmp0, float *tmp1)
458 {
459  memcpy(src, tmp0, 384 * sizeof(*tmp0));
460  memcpy(tmp0 + 384, src + 384, 128 * sizeof(*tmp0));
461 
462  zero_head_and_tail(src, 128, 16, 4);
463  zero_head_and_tail(src + 128, 128, 16, 4);
464  zero_head_and_tail(src + 256, 128, 13, 7);
465  zero_head_and_tail(src + 384, 128, 15, 5);
466 
467  c->fft128.fft_permute(&c->fft128, (FFTComplex*)src);
468  c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 128));
469  c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 256));
470  c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 384));
471  c->fft128.fft_calc(&c->fft128, (FFTComplex*)src);
472  c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 128));
473  c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 256));
474  c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 384));
475  combine_fft(src, src + 128, src + 256, src + 384, tmp1,
476  ff_on2avc_ctab_1, ff_on2avc_ctab_2,
477  ff_on2avc_ctab_3, ff_on2avc_ctab_4, 512, 2);
478  c->fft512.fft_permute(&c->fft512, (FFTComplex*)tmp1);
479  c->fft512.fft_calc(&c->fft512, (FFTComplex*)tmp1);
480 
481  pretwiddle(&tmp0[ 0], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
482  pretwiddle(&tmp0[128], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
483  pretwiddle(&tmp0[256], tmp1, 512, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
484  pretwiddle(&tmp0[384], tmp1, 512, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
485 
486  memcpy(src, tmp1, 512 * sizeof(float));
487 }
488 
489 static void wtf_end_1024(On2AVCContext *c, float *out, float *src,
490  float *tmp0, float *tmp1)
491 {
492  memcpy(src, tmp0, 768 * sizeof(*tmp0));
493  memcpy(tmp0 + 768, src + 768, 256 * sizeof(*tmp0));
494 
495  zero_head_and_tail(src, 256, 16, 4);
496  zero_head_and_tail(src + 256, 256, 16, 4);
497  zero_head_and_tail(src + 512, 256, 13, 7);
498  zero_head_and_tail(src + 768, 256, 15, 5);
499 
500  c->fft256.fft_permute(&c->fft256, (FFTComplex*)src);
501  c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 256));
502  c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 512));
503  c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 768));
504  c->fft256.fft_calc(&c->fft256, (FFTComplex*)src);
505  c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 256));
506  c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 512));
507  c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 768));
508  combine_fft(src, src + 256, src + 512, src + 768, tmp1,
509  ff_on2avc_ctab_1, ff_on2avc_ctab_2,
510  ff_on2avc_ctab_3, ff_on2avc_ctab_4, 1024, 1);
511  c->fft1024.fft_permute(&c->fft1024, (FFTComplex*)tmp1);
512  c->fft1024.fft_calc(&c->fft1024, (FFTComplex*)tmp1);
513 
514  pretwiddle(&tmp0[ 0], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
515  pretwiddle(&tmp0[256], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
516  pretwiddle(&tmp0[512], tmp1, 1024, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
517  pretwiddle(&tmp0[768], tmp1, 1024, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
518 
519  memcpy(src, tmp1, 1024 * sizeof(float));
520 }
521 
522 static void wtf_40(On2AVCContext *c, float *out, float *src, int size)
523 {
524  float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
525 
526  memset(tmp0, 0, sizeof(*tmp0) * 1024);
527  memset(tmp1, 0, sizeof(*tmp1) * 1024);
528 
529  if (size == 512) {
530  twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
531  twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
532  twiddle(src + 16, &tmp0[ 16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
533  twiddle(src + 24, &tmp0[ 16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
534  twiddle(src + 32, &tmp0[ 32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
535  twiddle(src + 40, &tmp0[ 32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
536  twiddle(src + 48, &tmp0[ 48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
537  twiddle(src + 56, &tmp0[ 48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
538  twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
539  twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
540  twiddle(&tmp0[32], &tmp1[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
541  twiddle(&tmp0[48], &tmp1[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
542  twiddle(src + 64, &tmp1[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
543  twiddle(src + 80, &tmp1[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
544  twiddle(src + 96, &tmp1[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
545  twiddle(src + 112, &tmp1[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
546  twiddle(src + 128, &tmp1[128], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
547  twiddle(src + 144, &tmp1[128], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
548  twiddle(src + 160, &tmp1[160], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
549  twiddle(src + 176, &tmp1[160], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
550 
551  memset(tmp0, 0, 64 * sizeof(*tmp0));
552 
553  twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
554  twiddle(&tmp1[ 32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
555  twiddle(&tmp1[ 64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
556  twiddle(&tmp1[ 96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
557  twiddle(&tmp1[128], &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
558  twiddle(&tmp1[160], &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
559  twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
560  twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
561  twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
562  twiddle(src + 288, &tmp0[256], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
563  twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
564  twiddle(src + 352, &tmp0[256], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
565 
566  wtf_end_512(c, out, src, tmp0, tmp1);
567  } else {
568  twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
569  twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
570  twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
571  twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
572  twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
573  twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
574  twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
575  twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
576  twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
577  twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
578  twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
579  twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
580  twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
581  twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
582  twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
583  twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
584  twiddle(src + 256, &tmp1[256], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
585  twiddle(src + 288, &tmp1[256], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
586  twiddle(src + 320, &tmp1[320], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
587  twiddle(src + 352, &tmp1[320], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
588 
589  memset(tmp0, 0, 128 * sizeof(*tmp0));
590 
591  twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
592  twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
593  twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
594  twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
595  twiddle(&tmp1[256], &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
596  twiddle(&tmp1[320], &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
597  twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
598  twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
599  twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
600  twiddle(src + 576, &tmp0[512], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
601  twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
602  twiddle(src + 704, &tmp0[512], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
603 
604  wtf_end_1024(c, out, src, tmp0, tmp1);
605  }
606 }
607 
608 static void wtf_44(On2AVCContext *c, float *out, float *src, int size)
609 {
610  float *tmp0 = c->temp, *tmp1 = c->temp + 1024;
611 
612  memset(tmp0, 0, sizeof(*tmp0) * 1024);
613  memset(tmp1, 0, sizeof(*tmp1) * 1024);
614 
615  if (size == 512) {
616  twiddle(src, &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
617  twiddle(src + 8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
618  twiddle(src + 16, &tmp0[16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
619  twiddle(src + 24, &tmp0[16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
620  twiddle(src + 32, &tmp0[32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
621  twiddle(src + 40, &tmp0[32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
622  twiddle(src + 48, &tmp0[48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);
623  twiddle(src + 56, &tmp0[48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);
624  twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
625  twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
626  twiddle(&tmp0[32], &tmp1[32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
627  twiddle(&tmp0[48], &tmp1[32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
628  twiddle(src + 64, &tmp1[64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
629  twiddle(src + 80, &tmp1[64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
630  twiddle(src + 96, &tmp1[96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
631  twiddle(src + 112, &tmp1[96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
632 
633  memset(tmp0, 0, 64 * sizeof(*tmp0));
634 
635  twiddle(&tmp1[ 0], &tmp0[ 0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
636  twiddle(&tmp1[32], &tmp0[ 0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
637  twiddle(&tmp1[64], &tmp0[ 0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
638  twiddle(&tmp1[96], &tmp0[ 0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
639  twiddle(src + 128, &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
640  twiddle(src + 160, &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
641  twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
642  twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
643  twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
644  twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
645 
646  wtf_end_512(c, out, src, tmp0, tmp1);
647  } else {
648  twiddle(src, &tmp0[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
649  twiddle(src + 16, &tmp0[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
650  twiddle(src + 32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
651  twiddle(src + 48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
652  twiddle(src + 64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
653  twiddle(src + 80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
654  twiddle(src + 96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);
655  twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);
656  twiddle(&tmp0[ 0], &tmp1[ 0], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
657  twiddle(&tmp0[32], &tmp1[ 0], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
658  twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
659  twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
660  twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
661  twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
662  twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
663  twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
664 
665  memset(tmp0, 0, 128 * sizeof(*tmp0));
666 
667  twiddle(&tmp1[ 0], &tmp0[ 0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
668  twiddle(&tmp1[ 64], &tmp0[ 0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
669  twiddle(&tmp1[128], &tmp0[ 0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
670  twiddle(&tmp1[192], &tmp0[ 0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
671  twiddle(src + 256, &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);
672  twiddle(src + 320, &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);
673  twiddle(src + 384, &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);
674  twiddle(src + 448, &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);
675  twiddle(src + 512, &tmp0[512], 256, ff_on2avc_tab_40_1, 40, 2, 11, 8, ff_on2avc_tabs_19_40_1);
676  twiddle(src + 640, &tmp0[512], 256, ff_on2avc_tab_40_2, 40, 2, 8, 11, ff_on2avc_tabs_19_40_2);
677 
678  wtf_end_1024(c, out, src, tmp0, tmp1);
679  }
680 }
681 
682 static int on2avc_reconstruct_stereo(On2AVCContext *c, AVFrame *dst, int offset)
683 {
684  int ch, i;
685 
686  for (ch = 0; ch < 2; ch++) {
687  float *out = (float*)dst->extended_data[ch] + offset;
688  float *in = c->coeffs[ch];
689  float *saved = c->delay[ch];
690  float *buf = c->mdct_buf;
691  float *wout = out + 448;
692 
693  switch (c->window_type) {
694  case WINDOW_TYPE_EXT7:
695  c->mdct.imdct_half(&c->mdct, buf, in);
696  break;
697  case WINDOW_TYPE_EXT4:
698  c->wtf(c, buf, in, 1024);
699  break;
700  case WINDOW_TYPE_EXT5:
701  c->wtf(c, buf, in, 512);
702  c->mdct.imdct_half(&c->mdct_half, buf + 512, in + 512);
703  for (i = 0; i < 256; i++) {
704  FFSWAP(float, buf[i + 512], buf[1023 - i]);
705  }
706  break;
707  case WINDOW_TYPE_EXT6:
708  c->mdct.imdct_half(&c->mdct_half, buf, in);
709  for (i = 0; i < 256; i++) {
710  FFSWAP(float, buf[i], buf[511 - i]);
711  }
712  c->wtf(c, buf + 512, in + 512, 512);
713  break;
714  }
715 
716  memcpy(out, saved, 448 * sizeof(float));
717  c->fdsp.vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
718  memcpy(wout + 128, buf + 64, 448 * sizeof(float));
719  memcpy(saved, buf + 512, 448 * sizeof(float));
720  memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
721  }
722 
723  return 0;
724 }
725 
726 // not borrowed from aacdec.c - the codec has original design after all
727 static int on2avc_reconstruct_channel(On2AVCContext *c, int channel,
728  AVFrame *dst, int offset)
729 {
730  int i;
731  float *out = (float*)dst->extended_data[channel] + offset;
732  float *in = c->coeffs[channel];
733  float *saved = c->delay[channel];
734  float *buf = c->mdct_buf;
735  float *temp = c->temp;
736 
737  switch (c->window_type) {
738  case WINDOW_TYPE_LONG_START:
739  case WINDOW_TYPE_LONG_STOP:
740  case WINDOW_TYPE_LONG:
741  c->mdct.imdct_half(&c->mdct, buf, in);
742  break;
743  case WINDOW_TYPE_8SHORT:
744  for (i = 0; i < ON2AVC_SUBFRAME_SIZE; i += ON2AVC_SUBFRAME_SIZE / 8)
745  c->mdct_small.imdct_half(&c->mdct_small, buf + i, in + i);
746  break;
747  }
748 
749  if ((c->prev_window_type == WINDOW_TYPE_LONG ||
750  c->prev_window_type == WINDOW_TYPE_LONG_STOP) &&
751  (c->window_type == WINDOW_TYPE_LONG ||
752  c->window_type == WINDOW_TYPE_LONG_START)) {
753  c->fdsp.vector_fmul_window(out, saved, buf, c->long_win, 512);
754  } else {
755  float *wout = out + 448;
756  memcpy(out, saved, 448 * sizeof(float));
757 
758  if (c->window_type == WINDOW_TYPE_8SHORT) {
759  c->fdsp.vector_fmul_window(wout + 0*128, saved + 448, buf + 0*128, c->short_win, 64);
760  c->fdsp.vector_fmul_window(wout + 1*128, buf + 0*128 + 64, buf + 1*128, c->short_win, 64);
761  c->fdsp.vector_fmul_window(wout + 2*128, buf + 1*128 + 64, buf + 2*128, c->short_win, 64);
762  c->fdsp.vector_fmul_window(wout + 3*128, buf + 2*128 + 64, buf + 3*128, c->short_win, 64);
763  c->fdsp.vector_fmul_window(temp, buf + 3*128 + 64, buf + 4*128, c->short_win, 64);
764  memcpy(wout + 4*128, temp, 64 * sizeof(float));
765  } else {
766  c->fdsp.vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);
767  memcpy(wout + 128, buf + 64, 448 * sizeof(float));
768  }
769  }
770 
771  // buffer update
772  switch (c->window_type) {
773  case WINDOW_TYPE_8SHORT:
774  memcpy(saved, temp + 64, 64 * sizeof(float));
775  c->fdsp.vector_fmul_window(saved + 64, buf + 4*128 + 64, buf + 5*128, c->short_win, 64);
776  c->fdsp.vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, c->short_win, 64);
777  c->fdsp.vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, c->short_win, 64);
778  memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
779  break;
780  case WINDOW_TYPE_LONG_START:
781  memcpy(saved, buf + 512, 448 * sizeof(float));
782  memcpy(saved + 448, buf + 7*128 + 64, 64 * sizeof(float));
783  break;
784  case WINDOW_TYPE_LONG_STOP:
785  case WINDOW_TYPE_LONG:
786  memcpy(saved, buf + 512, 512 * sizeof(float));
787  break;
788  }
789  return 0;
790 }
791 
792 static int on2avc_decode_subframe(On2AVCContext *c, const uint8_t *buf,
793  int buf_size, AVFrame *dst, int offset)
794 {
795  GetBitContext gb;
796  int i, ret;
797 
798  init_get_bits(&gb, buf, buf_size * 8);
799  if (get_bits1(&gb)) {
800  av_log(c->avctx, AV_LOG_ERROR, "enh bit set\n");
801  return AVERROR_INVALIDDATA;
802  }
803  c->prev_window_type = c->window_type;
804  c->window_type = get_bits(&gb, 3);
805  if (c->window_type >= WINDOW_TYPE_EXT4 && c->avctx->channels == 1) {
806  av_log(c->avctx, AV_LOG_ERROR, "stereo mode window for mono audio\n");
807  return AVERROR_INVALIDDATA;
808  }
809 
810  c->band_start = c->modes[c->window_type].band_start;
811  c->num_windows = c->modes[c->window_type].num_windows;
812  c->num_bands = c->modes[c->window_type].num_bands;
813  c->is_long = (c->window_type != WINDOW_TYPE_8SHORT);
814 
815  c->grouping[0] = 1;
816  for (i = 1; i < c->num_windows; i++)
817  c->grouping[i] = !get_bits1(&gb);
818 
819  on2avc_read_ms_info(c, &gb);
820  for (i = 0; i < c->avctx->channels; i++)
821  if ((ret = on2avc_read_channel_data(c, &gb, i)) < 0)
822  return AVERROR_INVALIDDATA;
823  if (c->avctx->channels == 2 && c->ms_present)
824  on2avc_apply_ms(c);
825  if (c->window_type < WINDOW_TYPE_EXT4) {
826  for (i = 0; i < c->avctx->channels; i++)
827  on2avc_reconstruct_channel(c, i, dst, offset);
828  } else {
829  on2avc_reconstruct_stereo(c, dst, offset);
830  }
831 
832  return 0;
833 }
834 
835 static int on2avc_decode_frame(AVCodecContext * avctx, void *data,
836  int *got_frame_ptr, AVPacket *avpkt)
837 {
838  AVFrame *frame = data;
839  const uint8_t *buf = avpkt->data;
840  int buf_size = avpkt->size;
841  On2AVCContext *c = avctx->priv_data;
842  GetByteContext gb;
843  int num_frames = 0, frame_size, audio_off;
844  int ret;
845 
846  if (c->is_av500) {
847  /* get output buffer */
848  frame->nb_samples = ON2AVC_SUBFRAME_SIZE;
849  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
850  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
851  return ret;
852  }
853 
854  if ((ret = on2avc_decode_subframe(c, buf, buf_size, frame, 0)) < 0)
855  return ret;
856  } else {
857  bytestream2_init(&gb, buf, buf_size);
858  while (bytestream2_get_bytes_left(&gb) > 2) {
859  frame_size = bytestream2_get_le16(&gb);
860  if (!frame_size || frame_size > bytestream2_get_bytes_left(&gb)) {
861  av_log(avctx, AV_LOG_ERROR, "Invalid subframe size %d\n",
862  frame_size);
863  return AVERROR_INVALIDDATA;
864  }
865  num_frames++;
866  bytestream2_skip(&gb, frame_size);
867  }
868  if (!num_frames) {
869  av_log(avctx, AV_LOG_ERROR, "No subframes present\n");
870  return AVERROR_INVALIDDATA;
871  }
872 
873  /* get output buffer */
874  frame->nb_samples = ON2AVC_SUBFRAME_SIZE * num_frames;
875  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
876  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
877  return ret;
878  }
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 
897 static 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 
906 static av_cold int on2avc_decode_init(AVCodecContext *avctx)
907 {
908  On2AVCContext *c = avctx->priv_data;
909  int i;
910 
911  c->avctx = avctx;
912  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
913  avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO
914  : AV_CH_LAYOUT_MONO;
915 
916  c->is_av500 = (avctx->codec_tag == 0x500);
917  if (c->is_av500 && avctx->channels == 2) {
918  av_log(avctx, AV_LOG_ERROR, "0x500 version should be mono\n");
919  return AVERROR_INVALIDDATA;
920  }
921  if (avctx->channels == 2)
922  av_log(avctx, AV_LOG_WARNING,
923  "Stereo mode support is not good, patch is welcome\n");
924 
925  for (i = 0; i < 20; i++)
926  c->scale_tab[i] = ceil(pow(10.0, i * 0.1) * 16) / 32;
927  for (; i < 128; i++)
928  c->scale_tab[i] = ceil(pow(10.0, i * 0.1) * 0.5);
929 
930  if (avctx->sample_rate < 32000 || avctx->channels == 1)
931  memcpy(c->long_win, ff_on2avc_window_long_24000,
932  1024 * sizeof(*c->long_win));
933  else
934  memcpy(c->long_win, ff_on2avc_window_long_32000,
935  1024 * sizeof(*c->long_win));
936  memcpy(c->short_win, ff_on2avc_window_short, 128 * sizeof(*c->short_win));
937 
938  c->modes = (avctx->sample_rate <= 40000) ? ff_on2avc_modes_40
939  : ff_on2avc_modes_44;
940  c->wtf = (avctx->sample_rate <= 40000) ? wtf_40
941  : wtf_44;
942 
943  ff_mdct_init(&c->mdct, 11, 1, 1.0 / (32768.0 * 1024.0));
944  ff_mdct_init(&c->mdct_half, 10, 1, 1.0 / (32768.0 * 512.0));
945  ff_mdct_init(&c->mdct_small, 8, 1, 1.0 / (32768.0 * 128.0));
946  ff_fft_init(&c->fft128, 6, 0);
947  ff_fft_init(&c->fft256, 7, 0);
948  ff_fft_init(&c->fft512, 8, 1);
949  ff_fft_init(&c->fft1024, 9, 1);
950  avpriv_float_dsp_init(&c->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
951 
952  if (init_vlc(&c->scale_diff, 9, ON2AVC_SCALE_DIFFS,
953  ff_on2avc_scale_diff_bits, 1, 1,
954  ff_on2avc_scale_diff_codes, 4, 4, 0)) {
955  av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");
956  return AVERROR(ENOMEM);
957  }
958  for (i = 1; i < 9; i++) {
959  int idx = i - 1;
960  if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_quad_cb_elems[idx],
961  ff_on2avc_quad_cb_bits[idx], 1, 1,
962  ff_on2avc_quad_cb_codes[idx], 4, 4,
963  ff_on2avc_quad_cb_syms[idx], 2, 2, 0)) {
964  av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");
965  on2avc_free_vlcs(c);
966  return AVERROR(ENOMEM);
967  }
968  }
969  for (i = 9; i < 16; i++) {
970  int idx = i - 9;
971  if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_pair_cb_elems[idx],
972  ff_on2avc_pair_cb_bits[idx], 1, 1,
973  ff_on2avc_pair_cb_codes[idx], 2, 2,
974  ff_on2avc_pair_cb_syms[idx], 2, 2, 0)) {
975  av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");
976  on2avc_free_vlcs(c);
977  return AVERROR(ENOMEM);
978  }
979  }
980 
981  return 0;
982 }
983 
984 static av_cold int on2avc_decode_close(AVCodecContext *avctx)
985 {
986  On2AVCContext *c = avctx->priv_data;
987 
988  ff_mdct_end(&c->mdct);
989  ff_mdct_end(&c->mdct_half);
990  ff_mdct_end(&c->mdct_small);
991  ff_fft_end(&c->fft128);
992  ff_fft_end(&c->fft256);
993  ff_fft_end(&c->fft512);
994  ff_fft_end(&c->fft1024);
995 
996  on2avc_free_vlcs(c);
997 
998  return 0;
999 }
1000 
1001 
1002 AVCodec ff_on2avc_decoder = {
1003  .name = "on2avc",
1004  .long_name = NULL_IF_CONFIG_SMALL("On2 Audio for Video Codec"),
1005  .type = AVMEDIA_TYPE_AUDIO,
1006  .id = AV_CODEC_ID_ON2AVC,
1007  .priv_data_size = sizeof(On2AVCContext),
1008  .init = on2avc_decode_init,
1009  .decode = on2avc_decode_frame,
1010  .close = on2avc_decode_close,
1011  .capabilities = CODEC_CAP_DR1,
1012  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1013  AV_SAMPLE_FMT_NONE },
1014 };
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