2 * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/intmath.h"
22 #include "libavutil/log.h"
23 #include "libavutil/opt.h"
29 #include "rangecoder.h"
32 #include "mpegvideo.h"
35 static 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;
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];
50 if(s->keyframe || (s->avctx->debug&512)){
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];
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));
62 if(v&(~255)) v= ~(v>>31);
63 dst8[x + y*ref_stride]= v;
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];
71 line[x] -= 128 << FRAC_BITS;
72 // buf[x + y*w]-= 128<<FRAC_BITS;
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,
86 w, ref_stride, obmc_stride,
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];
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;
117 static 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;
120 const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
121 int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
122 int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
125 if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
130 /* If we are on the second or later slice, restore our index. */
132 new_index = save_state[0];
135 for(y=start_y; y<h; y++){
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;
143 register int t= (int)( (v>>1)*(unsigned)qmul + qadd)>>QEXPSHIFT;
144 register int u= -(v&1);
147 v = b->x_coeff[new_index].coeff;
148 x = b->x_coeff[new_index++].x;
152 /* Save our variables for the next slice. */
153 save_state[0] = new_index;
158 static 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;
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);
175 if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
177 int l = left->color[0];
178 int cb= left->color[1];
179 int cr= left->color[2];
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));
185 type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
188 pred_mv(s, &mx, &my, 0, left, top, tr);
189 ld = get_symbol(&s->c, &s->block_state[32], 1);
190 if (ld < -255 || ld > 255) {
191 return AVERROR_INVALIDDATA;
194 if (s->nb_planes > 2) {
195 cbd = get_symbol(&s->c, &s->block_state[64], 1);
196 crd = get_symbol(&s->c, &s->block_state[96], 1);
197 if (cbd < -255 || cbd > 255 || crd < -255 || crd > 255) {
198 return AVERROR_INVALIDDATA;
204 if(s->ref_frames > 1)
205 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
206 if (ref >= s->ref_frames) {
207 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
208 return AVERROR_INVALIDDATA;
210 pred_mv(s, &mx, &my, ref, left, top, tr);
211 mx+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
212 my+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
214 set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
216 if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
217 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
218 (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
219 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
225 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
226 const int w= b->width;
227 const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
228 const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
229 const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
232 if(s->qlog == LOSSLESS_QLOG) return;
234 for(y=start_y; y<end_y; y++){
235 // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
236 IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
240 line[x]= -((-i*(unsigned)qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
242 line[x]= (( i*(unsigned)qmul + qadd)>>(QEXPSHIFT));
248 static 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){
249 const int w= b->width;
252 IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
256 line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
258 for(y=start_y; y<end_y; y++){
260 // line = slice_buffer_get_line_from_address(sb, src + (y * stride));
261 line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
265 if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
266 else line[x] += line[x - 1];
268 if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
269 else line[x] += line[x - 1];
272 if(y) line[x] += prev[x];
278 static void decode_qlogs(SnowContext *s){
279 int plane_index, level, orientation;
281 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
282 for(level=0; level<s->spatial_decomposition_count; level++){
283 for(orientation=level ? 1:0; orientation<4; orientation++){
285 if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
286 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
287 else q= get_symbol(&s->c, s->header_state, 1);
288 s->plane[plane_index].band[level][orientation].qlog= q;
294 #define GET_S(dst, check) \
295 tmp= get_symbol(&s->c, s->header_state, 0);\
297 av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
298 return AVERROR_INVALIDDATA;\
302 static int decode_header(SnowContext *s){
303 int plane_index, tmp;
306 memset(kstate, MID_STATE, sizeof(kstate));
308 s->keyframe= get_rac(&s->c, kstate);
309 if(s->keyframe || s->always_reset){
310 ff_snow_reset_contexts(s);
311 s->spatial_decomposition_type=
315 s->block_max_depth= 0;
318 GET_S(s->version, tmp <= 0U)
319 s->always_reset= get_rac(&s->c, s->header_state);
320 s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
321 s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
322 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
323 s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
324 if (s->colorspace_type == 1) {
325 s->avctx->pix_fmt= AV_PIX_FMT_GRAY8;
327 } else if(s->colorspace_type == 0) {
328 s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
329 s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
331 if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
332 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
333 }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
334 s->avctx->pix_fmt= AV_PIX_FMT_YUV444P;
335 }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
336 s->avctx->pix_fmt= AV_PIX_FMT_YUV410P;
338 av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
339 s->chroma_h_shift = s->chroma_v_shift = 1;
340 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
341 return AVERROR_INVALIDDATA;
345 av_log(s, AV_LOG_ERROR, "unsupported color space\n");
346 s->chroma_h_shift = s->chroma_v_shift = 1;
347 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;
348 return AVERROR_INVALIDDATA;
352 s->spatial_scalability= get_rac(&s->c, s->header_state);
353 // s->rate_scalability= get_rac(&s->c, s->header_state);
354 GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
361 if(get_rac(&s->c, s->header_state)){
362 for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
364 Plane *p= &s->plane[plane_index];
365 p->diag_mc= get_rac(&s->c, s->header_state);
366 htaps= get_symbol(&s->c, s->header_state, 0);
367 if((unsigned)htaps >= HTAPS_MAX/2 - 1)
368 return AVERROR_INVALIDDATA;
371 for(i= htaps/2; i; i--){
372 unsigned hcoeff = get_symbol(&s->c, s->header_state, 0);
374 return AVERROR_INVALIDDATA;
375 p->hcoeff[i]= hcoeff * (1-2*(i&1));
378 p->hcoeff[0]= 32-sum;
380 s->plane[2].diag_mc= s->plane[1].diag_mc;
381 s->plane[2].htaps = s->plane[1].htaps;
382 memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
384 if(get_rac(&s->c, s->header_state)){
385 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
390 s->spatial_decomposition_type+= (unsigned)get_symbol(&s->c, s->header_state, 1);
391 if(s->spatial_decomposition_type > 1U){
392 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
393 return AVERROR_INVALIDDATA;
395 if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
396 s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
397 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
398 return AVERROR_INVALIDDATA;
400 if (s->avctx->width > 65536-4) {
401 av_log(s->avctx, AV_LOG_ERROR, "Width %d is too large\n", s->avctx->width);
402 return AVERROR_INVALIDDATA;
406 s->qlog += (unsigned)get_symbol(&s->c, s->header_state, 1);
407 s->mv_scale += (unsigned)get_symbol(&s->c, s->header_state, 1);
408 s->qbias += (unsigned)get_symbol(&s->c, s->header_state, 1);
409 s->block_max_depth+= (unsigned)get_symbol(&s->c, s->header_state, 1);
410 if(s->block_max_depth > 1 || s->block_max_depth < 0 || s->mv_scale > 256U){
411 av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
412 s->block_max_depth= 0;
414 return AVERROR_INVALIDDATA;
416 if (FFABS(s->qbias) > 127) {
417 av_log(s->avctx, AV_LOG_ERROR, "qbias %d is too large\n", s->qbias);
419 return AVERROR_INVALIDDATA;
425 static int decode_blocks(SnowContext *s){
433 if (s->c.bytestream >= s->c.bytestream_end)
434 return AVERROR_INVALIDDATA;
435 if ((res = decode_q_branch(s, 0, x, y)) < 0)
442 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
445 const uint8_t *buf = avpkt->data;
446 int buf_size = avpkt->size;
447 SnowContext *s = avctx->priv_data;
448 RangeCoder * const c= &s->c;
450 AVFrame *picture = data;
451 int level, orientation, plane_index;
454 ff_init_range_decoder(c, buf, buf_size);
455 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
457 s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
458 if ((res = decode_header(s)) < 0)
460 if ((res=ff_snow_common_init_after_header(avctx)) < 0)
463 // realloc slice buffer for the case that spatial_decomposition_count changed
464 ff_slice_buffer_destroy(&s->sb);
465 if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
466 (MB_SIZE >> s->block_max_depth) +
467 s->spatial_decomposition_count * 11 + 1,
469 s->spatial_idwt_buffer)) < 0)
472 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
473 Plane *p= &s->plane[plane_index];
474 p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
479 ff_snow_alloc_blocks(s);
481 if((res = ff_snow_frame_start(s)) < 0)
484 s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
486 //keyframe flag duplication mess FIXME
487 if(avctx->debug&FF_DEBUG_PICT_INFO)
488 av_log(avctx, AV_LOG_ERROR,
489 "keyframe:%d qlog:%d qbias: %d mvscale: %d "
490 "decomposition_type:%d decomposition_count:%d\n",
491 s->keyframe, s->qlog, s->qbias, s->mv_scale,
492 s->spatial_decomposition_type,
493 s->spatial_decomposition_count
496 av_assert0(!s->avmv);
497 if (s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) {
498 s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));
502 if ((res = decode_blocks(s)) < 0)
505 for(plane_index=0; plane_index < s->nb_planes; plane_index++){
506 Plane *p= &s->plane[plane_index];
510 int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
512 if(s->avctx->debug&2048){
513 memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
514 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
518 int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
519 s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
524 for(level=0; level<s->spatial_decomposition_count; level++){
525 for(orientation=level ? 1 : 0; orientation<4; orientation++){
526 SubBand *b= &p->band[level][orientation];
527 unpack_coeffs(s, b, b->parent, orientation);
532 const int mb_h= s->b_height << s->block_max_depth;
533 const int block_size = MB_SIZE >> s->block_max_depth;
534 const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
536 DWTCompose cs[MAX_DECOMPOSITIONS];
541 ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);
542 for(mb_y=0; mb_y<=mb_h; mb_y++){
544 int slice_starty = block_h*mb_y;
545 int slice_h = block_h*(mb_y+1);
547 if (!(s->keyframe || s->avctx->debug&512)){
548 slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
549 slice_h -= (block_h >> 1);
552 for(level=0; level<s->spatial_decomposition_count; level++){
553 for(orientation=level ? 1 : 0; orientation<4; orientation++){
554 SubBand *b= &p->band[level][orientation];
557 int our_mb_start = mb_y;
558 int our_mb_end = (mb_y + 1);
560 start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
561 end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
562 if (!(s->keyframe || s->avctx->debug&512)){
563 start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
564 end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
566 start_y = FFMIN(b->height, start_y);
567 end_y = FFMIN(b->height, end_y);
569 if (start_y != end_y){
570 if (orientation == 0){
571 SubBand * correlate_band = &p->band[0][0];
572 int correlate_end_y = FFMIN(b->height, end_y + 1);
573 int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
574 decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
575 correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
576 dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
579 decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
584 for(; yd<slice_h; yd+=4){
585 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);
588 if(s->qlog == LOSSLESS_QLOG){
589 for(; yq<slice_h && yq<h; yq++){
590 IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
592 line[x] *= 1<<FRAC_BITS;
597 predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
599 y = FFMIN(p->height, slice_starty);
600 end_y = FFMIN(p->height, slice_h);
602 ff_slice_buffer_release(&s->sb, y++);
605 ff_slice_buffer_flush(&s->sb);
612 ff_snow_release_buffer(avctx);
614 if(!(s->avctx->debug&2048))
615 res = av_frame_ref(picture, s->current_picture);
617 res = av_frame_ref(picture, s->mconly_picture);
618 if (res >= 0 && s->avmv_index) {
621 sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector));
623 return AVERROR(ENOMEM);
624 memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));
634 bytes_read= c->bytestream - c->bytestream_start;
635 if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
640 static av_cold int decode_end(AVCodecContext *avctx)
642 SnowContext *s = avctx->priv_data;
644 ff_slice_buffer_destroy(&s->sb);
646 ff_snow_common_end(s);
651 const AVCodec ff_snow_decoder = {
653 .long_name = NULL_IF_CONFIG_SMALL("Snow"),
654 .type = AVMEDIA_TYPE_VIDEO,
655 .id = AV_CODEC_ID_SNOW,
656 .priv_data_size = sizeof(SnowContext),
657 .init = ff_snow_common_init,
659 .decode = decode_frame,
660 .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
661 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
662 FF_CODEC_CAP_INIT_CLEANUP,