GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/snowdec.c Lines: 304 387 78.6 %
Date: 2020-09-25 14:59:26 Branches: 212 310 68.4 %

Line Branch Exec Source
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
35
21699
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
21699
    Plane *p= &s->plane[plane_index];
37
21699
    const int mb_w= s->b_width  << s->block_max_depth;
38
21699
    const int mb_h= s->b_height << s->block_max_depth;
39
    int x, y, mb_x;
40
21699
    int block_size = MB_SIZE >> s->block_max_depth;
41
21699
    int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;
42
21699
    int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
43
21699
    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
21699
    int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
45
21699
    int ref_stride= s->current_picture->linesize[plane_index];
46
21699
    uint8_t *dst8= s->current_picture->data[plane_index];
47
21699
    int w= p->width;
48
21699
    int h= p->height;
49
50

21699
    if(s->keyframe || (s->avctx->debug&512)){
51
2664
        if(mb_y==mb_h)
52
168
            return;
53
54
2496
        if(add){
55
18176
            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
15680
                IDWTELEM * line = sb->line[y];
58
3359552
                for(x=0; x<w; x++){
59
//                    int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
60
3343872
                    int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
61
3343872
                    v >>= FRAC_BITS;
62
3343872
                    if(v&(~255)) v= ~(v>>31);
63
3343872
                    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
2496
        return;
78
    }
79
80
729810
    for(mb_x=0; mb_x<=mb_w; mb_x++){
81
710775
        add_yblock(s, 1, sb, old_buffer, dst8, obmc,
82
710775
                   block_w*mb_x - block_w/2,
83
710775
                   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

19035
    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
117
157912
static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
118
157912
    const int w= b->width;
119
    int y;
120
157912
    const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
121
157912
    int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
122
157912
    int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
123
157912
    int new_index = 0;
124
125

157912
    if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
126
130726
        qadd= 0;
127
130726
        qmul= 1<<QEXPSHIFT;
128
    }
129
130
    /* If we are on the second or later slice, restore our index. */
131
157912
    if (start_y != 0)
132
135784
        new_index = save_state[0];
133
134
135
533912
    for(y=start_y; y<h; y++){
136
376000
        int x = 0;
137
        int v;
138
376000
        IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset;
139
376000
        memset(line, 0, b->width*sizeof(IDWTELEM));
140
376000
        v = b->x_coeff[new_index].coeff;
141
376000
        x = b->x_coeff[new_index++].x;
142
16873440
        while(x < w){
143
16497440
            register int t= (int)( (v>>1)*(unsigned)qmul + qadd)>>QEXPSHIFT;
144
16497440
            register int u= -(v&1);
145
16497440
            line[x] = (t^u) - u;
146
147
16497440
            v = b->x_coeff[new_index].coeff;
148
16497440
            x = b->x_coeff[new_index++].x;
149
        }
150
    }
151
152
    /* Save our variables for the next slice. */
153
157912
    save_state[0] = new_index;
154
155
157912
    return;
156
}
157
158
250860
static int decode_q_branch(SnowContext *s, int level, int x, int y){
159
250860
    const int w= s->b_width << s->block_max_depth;
160
250860
    const int rem_depth= s->block_max_depth - level;
161
250860
    const int index= (x + y*w) << rem_depth;
162
250860
    int trx= (x+1)<<rem_depth;
163
250860
    const BlockNode *left  = x ? &s->block[index-1] : &null_block;
164
250860
    const BlockNode *top   = y ? &s->block[index-w] : &null_block;
165

250860
    const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
166


250860
    const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
167
250860
    int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
168
    int res;
169
170
250860
    if(s->keyframe){
171
8708
        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
8708
        return 0;
173
    }
174
175

439291
    if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
176
        int type, mx, my;
177
197139
        int l = left->color[0];
178
197139
        int cb= left->color[1];
179
197139
        int cr= left->color[2];
180
197139
        unsigned ref = 0;
181
197139
        int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
182
197139
        int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
183
197139
        int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
184
185
197139
        type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
186
197139
        if(type){
187
            int ld, cbd, crd;
188
44
            pred_mv(s, &mx, &my, 0, left, top, tr);
189
44
            ld = get_symbol(&s->c, &s->block_state[32], 1);
190

44
            if (ld < -255 || ld > 255) {
191
                return AVERROR_INVALIDDATA;
192
            }
193
44
            l += ld;
194
44
            if (s->nb_planes > 2) {
195
44
                cbd = get_symbol(&s->c, &s->block_state[64], 1);
196
44
                crd = get_symbol(&s->c, &s->block_state[96], 1);
197


44
                if (cbd < -255 || cbd > 255 || crd < -255 || crd > 255) {
198
                    return AVERROR_INVALIDDATA;
199
                }
200
44
                cb += cbd;
201
44
                cr += crd;
202
            }
203
        }else{
204
197095
            if(s->ref_frames > 1)
205
                ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
206
197095
            if (ref >= s->ref_frames) {
207
                av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
208
                return AVERROR_INVALIDDATA;
209
            }
210
197095
            pred_mv(s, &mx, &my, ref, left, top, tr);
211
197095
            mx+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
212
197095
            my+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
213
        }
214
197139
        set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
215
    }else{
216

90026
        if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
217
90026
            (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
218
90026
            (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
219
45013
            (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
220
            return res;
221
    }
222
242152
    return 0;
223
}
224
225
1537
static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
226
1537
    const int w= b->width;
227
1537
    const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
228
1537
    const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
229
1537
    const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
230
    int x,y;
231
232
1537
    if(s->qlog == LOSSLESS_QLOG) return;
233
234
2149
    for(y=start_y; y<end_y; y++){
235
//        DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
236
1228
        IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
237
4912
        for(x=0; x<w; x++){
238
3684
            int i= line[x];
239
3684
            if(i<0){
240
1591
                line[x]= -((-i*(unsigned)qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
241
2093
            }else if(i>0){
242
974
                line[x]=  (( i*(unsigned)qmul + qadd)>>(QEXPSHIFT));
243
            }
244
        }
245
    }
246
}
247
248
1537
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
1537
    const int w= b->width;
250
    int x,y;
251
252
1537
    IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
253
    IDWTELEM * prev;
254
255
1537
    if (start_y != 0)
256
154
        line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
257
258
5691
    for(y=start_y; y<end_y; y++){
259
4154
        prev = line;
260
//        line = slice_buffer_get_line_from_address(sb, src + (y * stride));
261
4154
        line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
262
32324
        for(x=0; x<w; x++){
263
28170
            if(x){
264
24016
                if(use_median){
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];
267
                }else{
268
24016
                    if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
269
4615
                    else  line[x] += line[x - 1];
270
                }
271
            }else{
272
4154
                if(y) line[x] += prev[x];
273
            }
274
        }
275
    }
276
1537
}
277
278
56
static void decode_qlogs(SnowContext *s){
279
    int plane_index, level, orientation;
280
281
224
    for(plane_index=0; plane_index < s->nb_planes; plane_index++){
282
1008
        for(level=0; level<s->spatial_decomposition_count; level++){
283
3528
            for(orientation=level ? 1:0; orientation<4; orientation++){
284
                int q;
285
2688
                if     (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
286
1792
                else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
287
1232
                else                    q= get_symbol(&s->c, s->header_state, 1);
288
2688
                s->plane[plane_index].band[level][orientation].qlog= q;
289
            }
290
        }
291
    }
292
56
}
293
294
#define GET_S(dst, check) \
295
    tmp= get_symbol(&s->c, s->header_state, 0);\
296
    if(!(check)){\
297
        av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
298
        return AVERROR_INVALIDDATA;\
299
    }\
300
    dst= tmp;
301
302
461
static int decode_header(SnowContext *s){
303
    int plane_index, tmp;
304
    uint8_t kstate[32];
305
306
461
    memset(kstate, MID_STATE, sizeof(kstate));
307
308
461
    s->keyframe= get_rac(&s->c, kstate);
309

461
    if(s->keyframe || s->always_reset){
310
56
        ff_snow_reset_contexts(s);
311
56
        s->spatial_decomposition_type=
312
56
        s->qlog=
313
56
        s->qbias=
314
56
        s->mv_scale=
315
56
        s->block_max_depth= 0;
316
    }
317
461
    if(s->keyframe){
318
56
        GET_S(s->version, tmp <= 0U)
319
56
        s->always_reset= get_rac(&s->c, s->header_state);
320
56
        s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);
321
56
        s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);
322

56
        GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
323
56
        s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
324
56
        if (s->colorspace_type == 1) {
325
            s->avctx->pix_fmt= AV_PIX_FMT_GRAY8;
326
            s->nb_planes = 1;
327
56
        } else if(s->colorspace_type == 0) {
328
56
            s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
329
56
            s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
330
331

56
            if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
332
56
                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;
337
            } else {
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;
342
            }
343
56
            s->nb_planes = 3;
344
        } else {
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;
349
        }
350
351
352
56
        s->spatial_scalability= get_rac(&s->c, s->header_state);
353
//        s->rate_scalability= get_rac(&s->c, s->header_state);
354
56
        GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
355
56
        s->max_ref_frames++;
356
357
56
        decode_qlogs(s);
358
    }
359
360
461
    if(!s->keyframe){
361
405
        if(get_rac(&s->c, s->header_state)){
362
135
            for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
363
90
                int htaps, i, sum=0;
364
90
                Plane *p= &s->plane[plane_index];
365
90
                p->diag_mc= get_rac(&s->c, s->header_state);
366
90
                htaps= get_symbol(&s->c, s->header_state, 0);
367
90
                if((unsigned)htaps >= HTAPS_MAX/2 - 1)
368
                    return AVERROR_INVALIDDATA;
369
90
                htaps = htaps*2 + 2;
370
90
                p->htaps= htaps;
371
360
                for(i= htaps/2; i; i--){
372
270
                    unsigned hcoeff = get_symbol(&s->c, s->header_state, 0);
373
270
                    if (hcoeff > 127)
374
                        return AVERROR_INVALIDDATA;
375
270
                    p->hcoeff[i]= hcoeff * (1-2*(i&1));
376
270
                    sum += p->hcoeff[i];
377
                }
378
90
                p->hcoeff[0]= 32-sum;
379
            }
380
45
            s->plane[2].diag_mc= s->plane[1].diag_mc;
381
45
            s->plane[2].htaps  = s->plane[1].htaps;
382
45
            memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
383
        }
384
405
        if(get_rac(&s->c, s->header_state)){
385
            GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)
386
            decode_qlogs(s);
387
        }
388
    }
389
390
461
    s->spatial_decomposition_type+= (unsigned)get_symbol(&s->c, s->header_state, 1);
391
461
    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;
394
    }
395
461
    if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
396
461
             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;
399
    }
400
461
    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;
403
    }
404
405
406
461
    s->qlog           += (unsigned)get_symbol(&s->c, s->header_state, 1);
407
461
    s->mv_scale       += (unsigned)get_symbol(&s->c, s->header_state, 1);
408
461
    s->qbias          += (unsigned)get_symbol(&s->c, s->header_state, 1);
409
461
    s->block_max_depth+= (unsigned)get_symbol(&s->c, s->header_state, 1);
410

461
    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;
413
        s->mv_scale = 0;
414
        return AVERROR_INVALIDDATA;
415
    }
416
461
    if (FFABS(s->qbias) > 127) {
417
        av_log(s->avctx, AV_LOG_ERROR, "qbias %d is too large\n", s->qbias);
418
        s->qbias = 0;
419
        return AVERROR_INVALIDDATA;
420
    }
421
422
461
    return 0;
423
}
424
425
461
static int decode_blocks(SnowContext *s){
426
    int x, y;
427
461
    int w= s->b_width;
428
461
    int h= s->b_height;
429
    int res;
430
431
4461
    for(y=0; y<h; y++){
432
74808
        for(x=0; x<w; x++){
433
70808
            if (s->c.bytestream >= s->c.bytestream_end)
434
                return AVERROR_INVALIDDATA;
435
70808
            if ((res = decode_q_branch(s, 0, x, y)) < 0)
436
                return res;
437
        }
438
    }
439
461
    return 0;
440
}
441
442
461
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
443
                        AVPacket *avpkt)
444
{
445
461
    const uint8_t *buf = avpkt->data;
446
461
    int buf_size = avpkt->size;
447
461
    SnowContext *s = avctx->priv_data;
448
461
    RangeCoder * const c= &s->c;
449
    int bytes_read;
450
461
    AVFrame *picture = data;
451
    int level, orientation, plane_index;
452
    int res;
453
454
461
    ff_init_range_decoder(c, buf, buf_size);
455
461
    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
456
457
461
    s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
458
461
    if ((res = decode_header(s)) < 0)
459
        return res;
460
461
    if ((res=ff_snow_common_init_after_header(avctx)) < 0)
461
        return res;
462
463
    // realloc slice buffer for the case that spatial_decomposition_count changed
464
461
    ff_slice_buffer_destroy(&s->sb);
465
461
    if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
466
461
                                    (MB_SIZE >> s->block_max_depth) +
467
461
                                    s->spatial_decomposition_count * 11 + 1,
468
                                    s->plane[0].width,
469
                                    s->spatial_idwt_buffer)) < 0)
470
        return res;
471
472
1844
    for(plane_index=0; plane_index < s->nb_planes; plane_index++){
473
1383
        Plane *p= &s->plane[plane_index];
474

2706
        p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
475
1323
                                              && p->hcoeff[1]==-10
476

2706
                                              && p->hcoeff[2]==2;
477
    }
478
479
461
    ff_snow_alloc_blocks(s);
480
481
461
    if((res = ff_snow_frame_start(s)) < 0)
482
        return res;
483
484
461
    s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
485
486
    //keyframe flag duplication mess FIXME
487
461
    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
494
              );
495
496
461
    av_assert0(!s->avmv);
497
461
    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));
499
    }
500
461
    s->avmv_index = 0;
501
502
461
    if ((res = decode_blocks(s)) < 0)
503
        return res;
504
505
1844
    for(plane_index=0; plane_index < s->nb_planes; plane_index++){
506
1383
        Plane *p= &s->plane[plane_index];
507
1383
        int w= p->width;
508
1383
        int h= p->height;
509
        int x, y;
510
        int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
511
512
1383
        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);
515
516
            for(y=0; y<h; y++){
517
                for(x=0; x<w; x++){
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;
520
                }
521
            }
522
        }
523
524
8298
        for(level=0; level<s->spatial_decomposition_count; level++){
525
29043
            for(orientation=level ? 1 : 0; orientation<4; orientation++){
526
22128
                SubBand *b= &p->band[level][orientation];
527
22128
                unpack_coeffs(s, b, b->parent, orientation);
528
            }
529
        }
530
531
        {
532
1383
        const int mb_h= s->b_height << s->block_max_depth;
533
1383
        const int block_size = MB_SIZE >> s->block_max_depth;
534
1383
        const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
535
        int mb_y;
536
        DWTCompose cs[MAX_DECOMPOSITIONS];
537
1383
        int yd=0, yq=0;
538
        int y;
539
        int end_y;
540
541
1383
        ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);
542
23082
        for(mb_y=0; mb_y<=mb_h; mb_y++){
543
544
21699
            int slice_starty = block_h*mb_y;
545
21699
            int slice_h = block_h*(mb_y+1);
546
547

21699
            if (!(s->keyframe || s->avctx->debug&512)){
548
19035
                slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
549
19035
                slice_h -= (block_h >> 1);
550
            }
551
552
130194
            for(level=0; level<s->spatial_decomposition_count; level++){
553
455679
                for(orientation=level ? 1 : 0; orientation<4; orientation++){
554
347184
                    SubBand *b= &p->band[level][orientation];
555
                    int start_y;
556
                    int end_y;
557
347184
                    int our_mb_start = mb_y;
558
347184
                    int our_mb_end = (mb_y + 1);
559
347184
                    const int extra= 3;
560
347184
                    start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
561
347184
                    end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
562

347184
                    if (!(s->keyframe || s->avctx->debug&512)){
563
304560
                        start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
564
304560
                        end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
565
                    }
566
347184
                    start_y = FFMIN(b->height, start_y);
567
347184
                    end_y = FFMIN(b->height, end_y);
568
569
347184
                    if (start_y != end_y){
570
157912
                        if (orientation == 0){
571
1537
                            SubBand * correlate_band = &p->band[0][0];
572
1537
                            int correlate_end_y = FFMIN(b->height, end_y + 1);
573
1537
                            int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
574
1537
                            decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
575
1537
                            correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
576
1537
                            dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
577
                        }
578
                        else
579
156375
                            decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
580
                    }
581
                }
582
            }
583
584
55556
            for(; yd<slice_h; yd+=4){
585
33857
                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);
586
            }
587
588
21699
            if(s->qlog == LOSSLESS_QLOG){
589

105798
                for(; yq<slice_h && yq<h; yq++){
590
88704
                    IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
591
23506560
                    for(x=0; x<w; x++){
592
23417856
                        line[x] *= 1<<FRAC_BITS;
593
                    }
594
                }
595
            }
596
597
21699
            predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
598
599
21699
            y = FFMIN(p->height, slice_starty);
600
21699
            end_y = FFMIN(p->height, slice_h);
601
149699
            while(y < end_y)
602
128000
                ff_slice_buffer_release(&s->sb, y++);
603
        }
604
605
1383
        ff_slice_buffer_flush(&s->sb);
606
        }
607
608
    }
609
610
461
    emms_c();
611
612
461
    ff_snow_release_buffer(avctx);
613
614
461
    if(!(s->avctx->debug&2048))
615
461
        res = av_frame_ref(picture, s->current_picture);
616
    else
617
        res = av_frame_ref(picture, s->mconly_picture);
618

461
    if (res >= 0 && s->avmv_index) {
619
        AVFrameSideData *sd;
620
621
        sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector));
622
        if (!sd)
623
            return AVERROR(ENOMEM);
624
        memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));
625
    }
626
627
461
    av_freep(&s->avmv);
628
629
461
    if (res < 0)
630
        return res;
631
632
461
    *got_frame = 1;
633
634
461
    bytes_read= c->bytestream - c->bytestream_start;
635
461
    if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
636
637
461
    return bytes_read;
638
}
639
640
20
static av_cold int decode_end(AVCodecContext *avctx)
641
{
642
20
    SnowContext *s = avctx->priv_data;
643
644
20
    ff_slice_buffer_destroy(&s->sb);
645
646
20
    ff_snow_common_end(s);
647
648
20
    return 0;
649
}
650
651
AVCodec ff_snow_decoder = {
652
    .name           = "snow",
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,
658
    .close          = decode_end,
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,
663
};