Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / snowdec.c
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2ba45a60
DM
1/*
2 * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "libavutil/intmath.h"
22#include "libavutil/log.h"
23#include "libavutil/opt.h"
24#include "avcodec.h"
25#include "snow_dwt.h"
26#include "internal.h"
27#include "snow.h"
28
29#include "rangecoder.h"
30#include "mathops.h"
31
32#include "mpegvideo.h"
33#include "h263.h"
34
35static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){
36 Plane *p= &s->plane[plane_index];
37 const int mb_w= s->b_width << s->block_max_depth;
38 const int mb_h= s->b_height << s->block_max_depth;
39 int x, y, mb_x;
40 int block_size = MB_SIZE >> s->block_max_depth;
41 int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;
42 int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
43 const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
44 int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
45 int ref_stride= s->current_picture->linesize[plane_index];
46 uint8_t *dst8= s->current_picture->data[plane_index];
47 int w= p->width;
48 int h= p->height;
49
50 if(s->keyframe || (s->avctx->debug&512)){
51 if(mb_y==mb_h)
52 return;
53
54 if(add){
55 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
56// DWTELEM * line = slice_buffer_get_line(sb, y);
57 IDWTELEM * line = sb->line[y];
58 for(x=0; x<w; x++){
59// int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
60 int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
61 v >>= FRAC_BITS;
62 if(v&(~255)) v= ~(v>>31);
63 dst8[x + y*ref_stride]= v;
64 }
65 }
66 }else{
67 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
68// DWTELEM * line = slice_buffer_get_line(sb, y);
69 IDWTELEM * line = sb->line[y];
70 for(x=0; x<w; x++){
71 line[x] -= 128 << FRAC_BITS;
72// buf[x + y*w]-= 128<<FRAC_BITS;
73 }
74 }
75 }
76
77 return;
78 }
79
80 for(mb_x=0; mb_x<=mb_w; mb_x++){
81 add_yblock(s, 1, sb, old_buffer, dst8, obmc,
82 block_w*mb_x - block_w/2,
83 block_h*mb_y - block_h/2,
84 block_w, block_h,
85 w, h,
86 w, ref_stride, obmc_stride,
87 mb_x - 1, mb_y - 1,
88 add, 0, plane_index);
89 }
90}
91
92static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
93 const int w= b->width;
94 int y;
95 const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
96 int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
97 int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
98 int new_index = 0;
99
100 if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
101 qadd= 0;
102 qmul= 1<<QEXPSHIFT;
103 }
104
105 /* If we are on the second or later slice, restore our index. */
106 if (start_y != 0)
107 new_index = save_state[0];
108
109
110 for(y=start_y; y<h; y++){
111 int x = 0;
112 int v;
113 IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset;
114 memset(line, 0, b->width*sizeof(IDWTELEM));
115 v = b->x_coeff[new_index].coeff;
116 x = b->x_coeff[new_index++].x;
117 while(x < w){
118 register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
119 register int u= -(v&1);
120 line[x] = (t^u) - u;
121
122 v = b->x_coeff[new_index].coeff;
123 x = b->x_coeff[new_index++].x;
124 }
125 }
126
127 /* Save our variables for the next slice. */
128 save_state[0] = new_index;
129
130 return;
131}
132
133static int decode_q_branch(SnowContext *s, int level, int x, int y){
134 const int w= s->b_width << s->block_max_depth;
135 const int rem_depth= s->block_max_depth - level;
136 const int index= (x + y*w) << rem_depth;
137 int trx= (x+1)<<rem_depth;
138 const BlockNode *left = x ? &s->block[index-1] : &null_block;
139 const BlockNode *top = y ? &s->block[index-w] : &null_block;
140 const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
141 const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
142 int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
143 int res;
144
145 if(s->keyframe){
146 set_blocks(s, level, x, y, null_block.color[0], null_block.color[1], null_block.color[2], null_block.mx, null_block.my, null_block.ref, BLOCK_INTRA);
147 return 0;
148 }
149
150 if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
151 int type, mx, my;
152 int l = left->color[0];
153 int cb= left->color[1];
154 int cr= left->color[2];
155 int ref = 0;
156 int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
157 int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
158 int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
159
160 type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
161
162 if(type){
163 pred_mv(s, &mx, &my, 0, left, top, tr);
164 l += get_symbol(&s->c, &s->block_state[32], 1);
165 if (s->nb_planes > 2) {
166 cb+= get_symbol(&s->c, &s->block_state[64], 1);
167 cr+= get_symbol(&s->c, &s->block_state[96], 1);
168 }
169 }else{
170 if(s->ref_frames > 1)
171 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
172 if (ref >= s->ref_frames) {
173 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
174 return AVERROR_INVALIDDATA;
175 }
176 pred_mv(s, &mx, &my, ref, left, top, tr);
177 mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
178 my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
179 }
180 set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
181 }else{
182 if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
183 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
184 (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
185 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
186 return res;
187 }
188 return 0;
189}
190
191static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
192 const int w= b->width;
193 const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
194 const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
195 const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
196 int x,y;
197
198 if(s->qlog == LOSSLESS_QLOG) return;
199
200 for(y=start_y; y<end_y; y++){
201// DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
202 IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
203 for(x=0; x<w; x++){
204 int i= line[x];
205 if(i<0){
206 line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
207 }else if(i>0){
208 line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));
209 }
210 }
211 }
212}
213
214static void correlate_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y){
215 const int w= b->width;
216 int x,y;
217
218 IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
219 IDWTELEM * prev;
220
221 if (start_y != 0)
222 line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
223
224 for(y=start_y; y<end_y; y++){
225 prev = line;
226// line = slice_buffer_get_line_from_address(sb, src + (y * stride));
227 line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
228 for(x=0; x<w; x++){
229 if(x){
230 if(use_median){
231 if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
232 else line[x] += line[x - 1];
233 }else{
234 if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
235 else line[x] += line[x - 1];
236 }
237 }else{
238 if(y) line[x] += prev[x];
239 }
240 }
241 }
242}
243
244static void decode_qlogs(SnowContext *s){
245 int plane_index, level, orientation;
246
247 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
248 for(level=0; level<s->spatial_decomposition_count; level++){
249 for(orientation=level ? 1:0; orientation<4; orientation++){
250 int q;
251 if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
252 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
253 else q= get_symbol(&s->c, s->header_state, 1);
254 s->plane[plane_index].band[level][orientation].qlog= q;
255 }
256 }
257 }
258}
259
260#define GET_S(dst, check) \
261 tmp= get_symbol(&s->c, s->header_state, 0);\
262 if(!(check)){\
263 av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
264 return AVERROR_INVALIDDATA;\
265 }\
266 dst= tmp;
267
268static int decode_header(SnowContext *s){
269 int plane_index, tmp;
270 uint8_t kstate[32];
271
272 memset(kstate, MID_STATE, sizeof(kstate));
273
274 s->keyframe= get_rac(&s->c, kstate);
275 if(s->keyframe || s->always_reset){
276 ff_snow_reset_contexts(s);
277 s->spatial_decomposition_type=
278 s->qlog=
279 s->qbias=
280 s->mv_scale=
281 s->block_max_depth= 0;
282 }
283 if(s->keyframe){
284 GET_S(s->version, tmp <= 0U)
285 s->always_reset= get_rac(&s->c, s->header_state);
286 s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
287 s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
288 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
289 s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
290 if (s->colorspace_type == 1) {
291 s->avctx->pix_fmt= AV_PIX_FMT_GRAY8;
292 s->nb_planes = 1;
293 } else if(s->colorspace_type == 0) {
294 s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
295 s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
296
297 if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
298 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
299 }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
300 s->avctx->pix_fmt= AV_PIX_FMT_YUV444P;
301 }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
302 s->avctx->pix_fmt= AV_PIX_FMT_YUV410P;
303 } else {
304 av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
305 s->chroma_h_shift = s->chroma_v_shift = 1;
306 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
307 return AVERROR_INVALIDDATA;
308 }
309 s->nb_planes = 3;
310 } else {
311 av_log(s, AV_LOG_ERROR, "unsupported color space\n");
312 s->chroma_h_shift = s->chroma_v_shift = 1;
313 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
314 return AVERROR_INVALIDDATA;
315 }
316
317
318 s->spatial_scalability= get_rac(&s->c, s->header_state);
319// s->rate_scalability= get_rac(&s->c, s->header_state);
320 GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
321 s->max_ref_frames++;
322
323 decode_qlogs(s);
324 }
325
326 if(!s->keyframe){
327 if(get_rac(&s->c, s->header_state)){
328 for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
329 int htaps, i, sum=0;
330 Plane *p= &s->plane[plane_index];
331 p->diag_mc= get_rac(&s->c, s->header_state);
332 htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
333 if((unsigned)htaps > HTAPS_MAX || htaps==0)
334 return AVERROR_INVALIDDATA;
335 p->htaps= htaps;
336 for(i= htaps/2; i; i--){
337 p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
338 sum += p->hcoeff[i];
339 }
340 p->hcoeff[0]= 32-sum;
341 }
342 s->plane[2].diag_mc= s->plane[1].diag_mc;
343 s->plane[2].htaps = s->plane[1].htaps;
344 memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
345 }
346 if(get_rac(&s->c, s->header_state)){
347 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
348 decode_qlogs(s);
349 }
350 }
351
352 s->spatial_decomposition_type+= get_symbol(&s->c, s->header_state, 1);
353 if(s->spatial_decomposition_type > 1U){
354 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
355 return AVERROR_INVALIDDATA;
356 }
357 if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
358 s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
359 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
360 return AVERROR_INVALIDDATA;
361 }
362
363
364 s->qlog += get_symbol(&s->c, s->header_state, 1);
365 s->mv_scale += get_symbol(&s->c, s->header_state, 1);
366 s->qbias += get_symbol(&s->c, s->header_state, 1);
367 s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
368 if(s->block_max_depth > 1 || s->block_max_depth < 0){
369 av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
370 s->block_max_depth= 0;
371 return AVERROR_INVALIDDATA;
372 }
373
374 return 0;
375}
376
377static av_cold int decode_init(AVCodecContext *avctx)
378{
379 int ret;
380
381 if ((ret = ff_snow_common_init(avctx)) < 0) {
382 ff_snow_common_end(avctx->priv_data);
383 return ret;
384 }
385
386 return 0;
387}
388
389static int decode_blocks(SnowContext *s){
390 int x, y;
391 int w= s->b_width;
392 int h= s->b_height;
393 int res;
394
395 for(y=0; y<h; y++){
396 for(x=0; x<w; x++){
397 if ((res = decode_q_branch(s, 0, x, y)) < 0)
398 return res;
399 }
400 }
401 return 0;
402}
403
404static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
405 AVPacket *avpkt)
406{
407 const uint8_t *buf = avpkt->data;
408 int buf_size = avpkt->size;
409 SnowContext *s = avctx->priv_data;
410 RangeCoder * const c= &s->c;
411 int bytes_read;
412 AVFrame *picture = data;
413 int level, orientation, plane_index;
414 int res;
415
416 ff_init_range_decoder(c, buf, buf_size);
417 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
418
419 s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
420 if ((res = decode_header(s)) < 0)
421 return res;
422 if ((res=ff_snow_common_init_after_header(avctx)) < 0)
423 return res;
424
425 // realloc slice buffer for the case that spatial_decomposition_count changed
426 ff_slice_buffer_destroy(&s->sb);
427 if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
428 (MB_SIZE >> s->block_max_depth) +
429 s->spatial_decomposition_count * 11 + 1,
430 s->plane[0].width,
431 s->spatial_idwt_buffer)) < 0)
432 return res;
433
434 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
435 Plane *p= &s->plane[plane_index];
436 p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
437 && p->hcoeff[1]==-10
438 && p->hcoeff[2]==2;
439 }
440
441 ff_snow_alloc_blocks(s);
442
443 if((res = ff_snow_frame_start(s)) < 0)
444 return res;
445 //keyframe flag duplication mess FIXME
446 if(avctx->debug&FF_DEBUG_PICT_INFO)
447 av_log(avctx, AV_LOG_ERROR,
448 "keyframe:%d qlog:%d qbias: %d mvscale: %d "
449 "decomposition_type:%d decomposition_count:%d\n",
450 s->keyframe, s->qlog, s->qbias, s->mv_scale,
451 s->spatial_decomposition_type,
452 s->spatial_decomposition_count
453 );
454
455 if ((res = decode_blocks(s)) < 0)
456 return res;
457
458 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
459 Plane *p= &s->plane[plane_index];
460 int w= p->width;
461 int h= p->height;
462 int x, y;
463 int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
464
465 if(s->avctx->debug&2048){
466 memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
467 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
468
469 for(y=0; y<h; y++){
470 for(x=0; x<w; x++){
471 int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
472 s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
473 }
474 }
475 }
476
477 {
478 for(level=0; level<s->spatial_decomposition_count; level++){
479 for(orientation=level ? 1 : 0; orientation<4; orientation++){
480 SubBand *b= &p->band[level][orientation];
481 unpack_coeffs(s, b, b->parent, orientation);
482 }
483 }
484 }
485
486 {
487 const int mb_h= s->b_height << s->block_max_depth;
488 const int block_size = MB_SIZE >> s->block_max_depth;
489 const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
490 int mb_y;
491 DWTCompose cs[MAX_DECOMPOSITIONS];
492 int yd=0, yq=0;
493 int y;
494 int end_y;
495
496 ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);
497 for(mb_y=0; mb_y<=mb_h; mb_y++){
498
499 int slice_starty = block_h*mb_y;
500 int slice_h = block_h*(mb_y+1);
501
502 if (!(s->keyframe || s->avctx->debug&512)){
503 slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
504 slice_h -= (block_h >> 1);
505 }
506
507 for(level=0; level<s->spatial_decomposition_count; level++){
508 for(orientation=level ? 1 : 0; orientation<4; orientation++){
509 SubBand *b= &p->band[level][orientation];
510 int start_y;
511 int end_y;
512 int our_mb_start = mb_y;
513 int our_mb_end = (mb_y + 1);
514 const int extra= 3;
515 start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
516 end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
517 if (!(s->keyframe || s->avctx->debug&512)){
518 start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
519 end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
520 }
521 start_y = FFMIN(b->height, start_y);
522 end_y = FFMIN(b->height, end_y);
523
524 if (start_y != end_y){
525 if (orientation == 0){
526 SubBand * correlate_band = &p->band[0][0];
527 int correlate_end_y = FFMIN(b->height, end_y + 1);
528 int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
529 decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
530 correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
531 dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
532 }
533 else
534 decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
535 }
536 }
537 }
538
539 for(; yd<slice_h; yd+=4){
540 ff_spatial_idwt_buffered_slice(&s->dwt, cs, &s->sb, s->temp_idwt_buffer, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count, yd);
541 }
542
543 if(s->qlog == LOSSLESS_QLOG){
544 for(; yq<slice_h && yq<h; yq++){
545 IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
546 for(x=0; x<w; x++){
547 line[x] <<= FRAC_BITS;
548 }
549 }
550 }
551
552 predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
553
554 y = FFMIN(p->height, slice_starty);
555 end_y = FFMIN(p->height, slice_h);
556 while(y < end_y)
557 ff_slice_buffer_release(&s->sb, y++);
558 }
559
560 ff_slice_buffer_flush(&s->sb);
561 }
562
563 }
564
565 emms_c();
566
567 ff_snow_release_buffer(avctx);
568
569 if(!(s->avctx->debug&2048))
570 res = av_frame_ref(picture, s->current_picture);
571 else
572 res = av_frame_ref(picture, s->mconly_picture);
573
574 if (res < 0)
575 return res;
576
577 *got_frame = 1;
578
579 bytes_read= c->bytestream - c->bytestream_start;
580 if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
581
582 return bytes_read;
583}
584
585static av_cold int decode_end(AVCodecContext *avctx)
586{
587 SnowContext *s = avctx->priv_data;
588
589 ff_slice_buffer_destroy(&s->sb);
590
591 ff_snow_common_end(s);
592
593 return 0;
594}
595
596AVCodec ff_snow_decoder = {
597 .name = "snow",
598 .long_name = NULL_IF_CONFIG_SMALL("Snow"),
599 .type = AVMEDIA_TYPE_VIDEO,
600 .id = AV_CODEC_ID_SNOW,
601 .priv_data_size = sizeof(SnowContext),
602 .init = decode_init,
603 .close = decode_end,
604 .decode = decode_frame,
605 .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
606};