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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 if(s->avmv && mb_y < mb_h && plane_index == 0)
92 for(mb_x=0; mb_x<mb_w; mb_x++){
93 AVMotionVector *avmv = s->avmv + s->avmv_index;
94 const int b_width = s->b_width << s->block_max_depth;
95 const int b_stride= b_width;
96 BlockNode *bn= &s->block[mb_x + mb_y*b_stride];
97
98 if (bn->type)
99 continue;
100
101 s->avmv_index++;
102
103 avmv->w = block_w;
104 avmv->h = block_h;
105 avmv->dst_x = block_w*mb_x - block_w/2;
106 avmv->dst_y = block_h*mb_y - block_h/2;
107 avmv->motion_scale = 8;
108 avmv->motion_x = bn->mx * s->mv_scale;
109 avmv->motion_y = bn->my * s->mv_scale;
110 avmv->src_x = avmv->dst_x + avmv->motion_x / 8;
111 avmv->src_y = avmv->dst_y + avmv->motion_y / 8;
112 avmv->source= -1 - bn->ref;
113 avmv->flags = 0;
114 }
115}
116
117static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
118 const int w= b->width;
119 int y;
120 const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
121 int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
122 int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
123 int new_index = 0;
124
125 if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
126 qadd= 0;
127 qmul= 1<<QEXPSHIFT;
128 }
129
130 /* If we are on the second or later slice, restore our index. */
131 if (start_y != 0)
132 new_index = save_state[0];
133
134
135 for(y=start_y; y<h; y++){
136 int x = 0;
137 int v;
138 IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset;
139 memset(line, 0, b->width*sizeof(IDWTELEM));
140 v = b->x_coeff[new_index].coeff;
141 x = b->x_coeff[new_index++].x;
142 while(x < w){
143 register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
144 register int u= -(v&1);
145 line[x] = (t^u) - u;
146
147 v = b->x_coeff[new_index].coeff;
148 x = b->x_coeff[new_index++].x;
149 }
150 }
151
152 /* Save our variables for the next slice. */
153 save_state[0] = new_index;
154
155 return;
156}
157
158static int decode_q_branch(SnowContext *s, int level, int x, int y){
159 const int w= s->b_width << s->block_max_depth;
160 const int rem_depth= s->block_max_depth - level;
161 const int index= (x + y*w) << rem_depth;
162 int trx= (x+1)<<rem_depth;
163 const BlockNode *left = x ? &s->block[index-1] : &null_block;
164 const BlockNode *top = y ? &s->block[index-w] : &null_block;
165 const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
166 const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
167 int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
168 int res;
169
170 if(s->keyframe){
171 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);
172 return 0;
173 }
174
175 if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
176 int type, mx, my;
177 int l = left->color[0];
178 int cb= left->color[1];
179 int cr= left->color[2];
180 unsigned ref = 0;
181 int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
182 int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
183 int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
184
185 type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
186
187 if(type){
188 pred_mv(s, &mx, &my, 0, left, top, tr);
189 l += get_symbol(&s->c, &s->block_state[32], 1);
190 if (s->nb_planes > 2) {
191 cb+= get_symbol(&s->c, &s->block_state[64], 1);
192 cr+= get_symbol(&s->c, &s->block_state[96], 1);
193 }
194 }else{
195 if(s->ref_frames > 1)
196 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
197 if (ref >= s->ref_frames) {
198 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
199 return AVERROR_INVALIDDATA;
200 }
201 pred_mv(s, &mx, &my, ref, left, top, tr);
202 mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
203 my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
204 }
205 set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
206 }else{
207 if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
208 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
209 (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
210 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
211 return res;
212 }
213 return 0;
214}
215
216static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
217 const int w= b->width;
218 const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
219 const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
220 const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
221 int x,y;
222
223 if(s->qlog == LOSSLESS_QLOG) return;
224
225 for(y=start_y; y<end_y; y++){
226// DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
227 IDWTELEM * 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 int i= line[x];
230 if(i<0){
231 line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
232 }else if(i>0){
233 line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));
234 }
235 }
236 }
237}
238
239static 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){
240 const int w= b->width;
241 int x,y;
242
243 IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
244 IDWTELEM * prev;
245
246 if (start_y != 0)
247 line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
248
249 for(y=start_y; y<end_y; y++){
250 prev = line;
251// line = slice_buffer_get_line_from_address(sb, src + (y * stride));
252 line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
253 for(x=0; x<w; x++){
254 if(x){
255 if(use_median){
256 if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
257 else line[x] += line[x - 1];
258 }else{
259 if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
260 else line[x] += line[x - 1];
261 }
262 }else{
263 if(y) line[x] += prev[x];
264 }
265 }
266 }
267}
268
269static void decode_qlogs(SnowContext *s){
270 int plane_index, level, orientation;
271
272 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
273 for(level=0; level<s->spatial_decomposition_count; level++){
274 for(orientation=level ? 1:0; orientation<4; orientation++){
275 int q;
276 if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
277 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
278 else q= get_symbol(&s->c, s->header_state, 1);
279 s->plane[plane_index].band[level][orientation].qlog= q;
280 }
281 }
282 }
283}
284
285#define GET_S(dst, check) \
286 tmp= get_symbol(&s->c, s->header_state, 0);\
287 if(!(check)){\
288 av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
289 return AVERROR_INVALIDDATA;\
290 }\
291 dst= tmp;
292
293static int decode_header(SnowContext *s){
294 int plane_index, tmp;
295 uint8_t kstate[32];
296
297 memset(kstate, MID_STATE, sizeof(kstate));
298
299 s->keyframe= get_rac(&s->c, kstate);
300 if(s->keyframe || s->always_reset){
301 ff_snow_reset_contexts(s);
302 s->spatial_decomposition_type=
303 s->qlog=
304 s->qbias=
305 s->mv_scale=
306 s->block_max_depth= 0;
307 }
308 if(s->keyframe){
309 GET_S(s->version, tmp <= 0U)
310 s->always_reset= get_rac(&s->c, s->header_state);
311 s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
312 s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
313 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
314 s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
315 if (s->colorspace_type == 1) {
316 s->avctx->pix_fmt= AV_PIX_FMT_GRAY8;
317 s->nb_planes = 1;
318 } else if(s->colorspace_type == 0) {
319 s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
320 s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
321
322 if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
323 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
324 }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
325 s->avctx->pix_fmt= AV_PIX_FMT_YUV444P;
326 }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
327 s->avctx->pix_fmt= AV_PIX_FMT_YUV410P;
328 } else {
329 av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
330 s->chroma_h_shift = s->chroma_v_shift = 1;
331 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
332 return AVERROR_INVALIDDATA;
333 }
334 s->nb_planes = 3;
335 } else {
336 av_log(s, AV_LOG_ERROR, "unsupported color space\n");
337 s->chroma_h_shift = s->chroma_v_shift = 1;
338 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
339 return AVERROR_INVALIDDATA;
340 }
341
342
343 s->spatial_scalability= get_rac(&s->c, s->header_state);
344// s->rate_scalability= get_rac(&s->c, s->header_state);
345 GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
346 s->max_ref_frames++;
347
348 decode_qlogs(s);
349 }
350
351 if(!s->keyframe){
352 if(get_rac(&s->c, s->header_state)){
353 for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
354 int htaps, i, sum=0;
355 Plane *p= &s->plane[plane_index];
356 p->diag_mc= get_rac(&s->c, s->header_state);
357 htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
358 if((unsigned)htaps > HTAPS_MAX || htaps==0)
359 return AVERROR_INVALIDDATA;
360 p->htaps= htaps;
361 for(i= htaps/2; i; i--){
362 p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
363 sum += p->hcoeff[i];
364 }
365 p->hcoeff[0]= 32-sum;
366 }
367 s->plane[2].diag_mc= s->plane[1].diag_mc;
368 s->plane[2].htaps = s->plane[1].htaps;
369 memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
370 }
371 if(get_rac(&s->c, s->header_state)){
372 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
373 decode_qlogs(s);
374 }
375 }
376
377 s->spatial_decomposition_type+= get_symbol(&s->c, s->header_state, 1);
378 if(s->spatial_decomposition_type > 1U){
379 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
380 return AVERROR_INVALIDDATA;
381 }
382 if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
383 s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
384 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
385 return AVERROR_INVALIDDATA;
386 }
387
388
389 s->qlog += get_symbol(&s->c, s->header_state, 1);
390 s->mv_scale += get_symbol(&s->c, s->header_state, 1);
391 s->qbias += get_symbol(&s->c, s->header_state, 1);
392 s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
393 if(s->block_max_depth > 1 || s->block_max_depth < 0){
394 av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
395 s->block_max_depth= 0;
396 return AVERROR_INVALIDDATA;
397 }
398
399 return 0;
400}
401
402static av_cold int decode_init(AVCodecContext *avctx)
403{
404 int ret;
405
406 if ((ret = ff_snow_common_init(avctx)) < 0) {
407 return ret;
408 }
409
410 return 0;
411}
412
413static int decode_blocks(SnowContext *s){
414 int x, y;
415 int w= s->b_width;
416 int h= s->b_height;
417 int res;
418
419 for(y=0; y<h; y++){
420 for(x=0; x<w; x++){
421 if ((res = decode_q_branch(s, 0, x, y)) < 0)
422 return res;
423 }
424 }
425 return 0;
426}
427
428static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
429 AVPacket *avpkt)
430{
431 const uint8_t *buf = avpkt->data;
432 int buf_size = avpkt->size;
433 SnowContext *s = avctx->priv_data;
434 RangeCoder * const c= &s->c;
435 int bytes_read;
436 AVFrame *picture = data;
437 int level, orientation, plane_index;
438 int res;
439
440 ff_init_range_decoder(c, buf, buf_size);
441 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
442
443 s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
444 if ((res = decode_header(s)) < 0)
445 return res;
446 if ((res=ff_snow_common_init_after_header(avctx)) < 0)
447 return res;
448
449 // realloc slice buffer for the case that spatial_decomposition_count changed
450 ff_slice_buffer_destroy(&s->sb);
451 if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
452 (MB_SIZE >> s->block_max_depth) +
453 s->spatial_decomposition_count * 11 + 1,
454 s->plane[0].width,
455 s->spatial_idwt_buffer)) < 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 p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
461 && p->hcoeff[1]==-10
462 && p->hcoeff[2]==2;
463 }
464
465 ff_snow_alloc_blocks(s);
466
467 if((res = ff_snow_frame_start(s)) < 0)
468 return res;
469
470 s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
471
472 //keyframe flag duplication mess FIXME
473 if(avctx->debug&FF_DEBUG_PICT_INFO)
474 av_log(avctx, AV_LOG_ERROR,
475 "keyframe:%d qlog:%d qbias: %d mvscale: %d "
476 "decomposition_type:%d decomposition_count:%d\n",
477 s->keyframe, s->qlog, s->qbias, s->mv_scale,
478 s->spatial_decomposition_type,
479 s->spatial_decomposition_count
480 );
481
482 av_assert0(!s->avmv);
483 if (s->avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) {
484 s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));
485 }
486 s->avmv_index = 0;
487
488 if ((res = decode_blocks(s)) < 0)
489 return res;
490
491 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
492 Plane *p= &s->plane[plane_index];
493 int w= p->width;
494 int h= p->height;
495 int x, y;
496 int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
497
498 if(s->avctx->debug&2048){
499 memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
500 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
501
502 for(y=0; y<h; y++){
503 for(x=0; x<w; x++){
504 int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
505 s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
506 }
507 }
508 }
509
510 {
511 for(level=0; level<s->spatial_decomposition_count; level++){
512 for(orientation=level ? 1 : 0; orientation<4; orientation++){
513 SubBand *b= &p->band[level][orientation];
514 unpack_coeffs(s, b, b->parent, orientation);
515 }
516 }
517 }
518
519 {
520 const int mb_h= s->b_height << s->block_max_depth;
521 const int block_size = MB_SIZE >> s->block_max_depth;
522 const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
523 int mb_y;
524 DWTCompose cs[MAX_DECOMPOSITIONS];
525 int yd=0, yq=0;
526 int y;
527 int end_y;
528
529 ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);
530 for(mb_y=0; mb_y<=mb_h; mb_y++){
531
532 int slice_starty = block_h*mb_y;
533 int slice_h = block_h*(mb_y+1);
534
535 if (!(s->keyframe || s->avctx->debug&512)){
536 slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
537 slice_h -= (block_h >> 1);
538 }
539
540 for(level=0; level<s->spatial_decomposition_count; level++){
541 for(orientation=level ? 1 : 0; orientation<4; orientation++){
542 SubBand *b= &p->band[level][orientation];
543 int start_y;
544 int end_y;
545 int our_mb_start = mb_y;
546 int our_mb_end = (mb_y + 1);
547 const int extra= 3;
548 start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
549 end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
550 if (!(s->keyframe || s->avctx->debug&512)){
551 start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
552 end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
553 }
554 start_y = FFMIN(b->height, start_y);
555 end_y = FFMIN(b->height, end_y);
556
557 if (start_y != end_y){
558 if (orientation == 0){
559 SubBand * correlate_band = &p->band[0][0];
560 int correlate_end_y = FFMIN(b->height, end_y + 1);
561 int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
562 decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
563 correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
564 dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
565 }
566 else
567 decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
568 }
569 }
570 }
571
572 for(; yd<slice_h; yd+=4){
573 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);
574 }
575
576 if(s->qlog == LOSSLESS_QLOG){
577 for(; yq<slice_h && yq<h; yq++){
578 IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
579 for(x=0; x<w; x++){
580 line[x] <<= FRAC_BITS;
581 }
582 }
583 }
584
585 predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
586
587 y = FFMIN(p->height, slice_starty);
588 end_y = FFMIN(p->height, slice_h);
589 while(y < end_y)
590 ff_slice_buffer_release(&s->sb, y++);
591 }
592
593 ff_slice_buffer_flush(&s->sb);
594 }
595
596 }
597
598 emms_c();
599
600 ff_snow_release_buffer(avctx);
601
602 if(!(s->avctx->debug&2048))
603 res = av_frame_ref(picture, s->current_picture);
604 else
605 res = av_frame_ref(picture, s->mconly_picture);
606 if (res >= 0 && s->avmv_index) {
607 AVFrameSideData *sd;
608
609 sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector));
610 if (!sd)
611 return AVERROR(ENOMEM);
612 memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));
613 }
614
615 av_freep(&s->avmv);
616
617 if (res < 0)
618 return res;
619
620 *got_frame = 1;
621
622 bytes_read= c->bytestream - c->bytestream_start;
623 if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
624
625 return bytes_read;
626}
627
628static av_cold int decode_end(AVCodecContext *avctx)
629{
630 SnowContext *s = avctx->priv_data;
631
632 ff_slice_buffer_destroy(&s->sb);
633
634 ff_snow_common_end(s);
635
636 return 0;
637}
638
639AVCodec ff_snow_decoder = {
640 .name = "snow",
641 .long_name = NULL_IF_CONFIG_SMALL("Snow"),
642 .type = AVMEDIA_TYPE_VIDEO,
643 .id = AV_CODEC_ID_SNOW,
644 .priv_data_size = sizeof(SnowContext),
645 .init = decode_init,
646 .close = decode_end,
647 .decode = decode_frame,
648 .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
649 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
650 FF_CODEC_CAP_INIT_CLEANUP,
651};
652
generated by cgit at 2024-05-17 18:53:17 (GMT)