Statistics
| Branch: | Revision:

ffmpeg / libavcodec / h264_refs.c @ 2912e87a

History | View | Annotate | Download (25.3 KB)

1
/*
2
 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * Libav is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with Libav; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file
24
 * H.264 / AVC / MPEG4 part10  reference picture handling.
25
 * @author Michael Niedermayer <michaelni@gmx.at>
26
 */
27

    
28
#include "internal.h"
29
#include "dsputil.h"
30
#include "avcodec.h"
31
#include "h264.h"
32
#include "golomb.h"
33

    
34
//#undef NDEBUG
35
#include <assert.h>
36

    
37

    
38
static void pic_as_field(Picture *pic, const int parity){
39
    int i;
40
    for (i = 0; i < 4; ++i) {
41
        if (parity == PICT_BOTTOM_FIELD)
42
            pic->data[i] += pic->linesize[i];
43
        pic->reference = parity;
44
        pic->linesize[i] *= 2;
45
    }
46
    pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
47
}
48

    
49
static int split_field_copy(Picture *dest, Picture *src,
50
                            int parity, int id_add){
51
    int match = !!(src->reference & parity);
52

    
53
    if (match) {
54
        *dest = *src;
55
        if(parity != PICT_FRAME){
56
            pic_as_field(dest, parity);
57
            dest->pic_id *= 2;
58
            dest->pic_id += id_add;
59
        }
60
    }
61

    
62
    return match;
63
}
64

    
65
static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){
66
    int i[2]={0};
67
    int index=0;
68

    
69
    while(i[0]<len || i[1]<len){
70
        while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel)))
71
            i[0]++;
72
        while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3))))
73
            i[1]++;
74
        if(i[0] < len){
75
            in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num;
76
            split_field_copy(&def[index++], in[ i[0]++ ], sel  , 1);
77
        }
78
        if(i[1] < len){
79
            in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num;
80
            split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0);
81
        }
82
    }
83

    
84
    return index;
85
}
86

    
87
static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){
88
    int i, best_poc;
89
    int out_i= 0;
90

    
91
    for(;;){
92
        best_poc= dir ? INT_MIN : INT_MAX;
93

    
94
        for(i=0; i<len; i++){
95
            const int poc= src[i]->poc;
96
            if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){
97
                best_poc= poc;
98
                sorted[out_i]= src[i];
99
            }
100
        }
101
        if(best_poc == (dir ? INT_MIN : INT_MAX))
102
            break;
103
        limit= sorted[out_i++]->poc - dir;
104
    }
105
    return out_i;
106
}
107

    
108
int ff_h264_fill_default_ref_list(H264Context *h){
109
    MpegEncContext * const s = &h->s;
110
    int i, len;
111

    
112
    if(h->slice_type_nos==FF_B_TYPE){
113
        Picture *sorted[32];
114
        int cur_poc, list;
115
        int lens[2];
116

    
117
        if(FIELD_PICTURE)
118
            cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];
119
        else
120
            cur_poc= s->current_picture_ptr->poc;
121

    
122
        for(list= 0; list<2; list++){
123
            len= add_sorted(sorted    , h->short_ref, h->short_ref_count, cur_poc, 1^list);
124
            len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list);
125
            assert(len<=32);
126
            len= build_def_list(h->default_ref_list[list]    , sorted     , len, 0, s->picture_structure);
127
            len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure);
128
            assert(len<=32);
129

    
130
            if(len < h->ref_count[list])
131
                memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
132
            lens[list]= len;
133
        }
134

    
135
        if(lens[0] == lens[1] && lens[1] > 1){
136
            for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
137
            if(i == lens[0])
138
                FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
139
        }
140
    }else{
141
        len = build_def_list(h->default_ref_list[0]    , h->short_ref, h->short_ref_count, 0, s->picture_structure);
142
        len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16                , 1, s->picture_structure);
143
        assert(len <= 32);
144
        if(len < h->ref_count[0])
145
            memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));
146
    }
147
#ifdef TRACE
148
    for (i=0; i<h->ref_count[0]; i++) {
149
        tprintf(h->s.avctx, "List0: %s fn:%d 0x%p\n", (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), h->default_ref_list[0][i].pic_id, h->default_ref_list[0][i].data[0]);
150
    }
151
    if(h->slice_type_nos==FF_B_TYPE){
152
        for (i=0; i<h->ref_count[1]; i++) {
153
            tprintf(h->s.avctx, "List1: %s fn:%d 0x%p\n", (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), h->default_ref_list[1][i].pic_id, h->default_ref_list[1][i].data[0]);
154
        }
155
    }
156
#endif
157
    return 0;
158
}
159

    
160
static void print_short_term(H264Context *h);
161
static void print_long_term(H264Context *h);
162

    
163
/**
164
 * Extract structure information about the picture described by pic_num in
165
 * the current decoding context (frame or field). Note that pic_num is
166
 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
167
 * @param pic_num picture number for which to extract structure information
168
 * @param structure one of PICT_XXX describing structure of picture
169
 *                      with pic_num
170
 * @return frame number (short term) or long term index of picture
171
 *         described by pic_num
172
 */
173
static int pic_num_extract(H264Context *h, int pic_num, int *structure){
174
    MpegEncContext * const s = &h->s;
175

    
176
    *structure = s->picture_structure;
177
    if(FIELD_PICTURE){
178
        if (!(pic_num & 1))
179
            /* opposite field */
180
            *structure ^= PICT_FRAME;
181
        pic_num >>= 1;
182
    }
183

    
184
    return pic_num;
185
}
186

    
187
int ff_h264_decode_ref_pic_list_reordering(H264Context *h){
188
    MpegEncContext * const s = &h->s;
189
    int list, index, pic_structure;
190

    
191
    print_short_term(h);
192
    print_long_term(h);
193

    
194
    for(list=0; list<h->list_count; list++){
195
        memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]);
196

    
197
        if(get_bits1(&s->gb)){
198
            int pred= h->curr_pic_num;
199

    
200
            for(index=0; ; index++){
201
                unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb);
202
                unsigned int pic_id;
203
                int i;
204
                Picture *ref = NULL;
205

    
206
                if(reordering_of_pic_nums_idc==3)
207
                    break;
208

    
209
                if(index >= h->ref_count[list]){
210
                    av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n");
211
                    return -1;
212
                }
213

    
214
                if(reordering_of_pic_nums_idc<3){
215
                    if(reordering_of_pic_nums_idc<2){
216
                        const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1;
217
                        int frame_num;
218

    
219
                        if(abs_diff_pic_num > h->max_pic_num){
220
                            av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
221
                            return -1;
222
                        }
223

    
224
                        if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num;
225
                        else                                pred+= abs_diff_pic_num;
226
                        pred &= h->max_pic_num - 1;
227

    
228
                        frame_num = pic_num_extract(h, pred, &pic_structure);
229

    
230
                        for(i= h->short_ref_count-1; i>=0; i--){
231
                            ref = h->short_ref[i];
232
                            assert(ref->reference);
233
                            assert(!ref->long_ref);
234
                            if(
235
                                   ref->frame_num == frame_num &&
236
                                   (ref->reference & pic_structure)
237
                              )
238
                                break;
239
                        }
240
                        if(i>=0)
241
                            ref->pic_id= pred;
242
                    }else{
243
                        int long_idx;
244
                        pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx
245

    
246
                        long_idx= pic_num_extract(h, pic_id, &pic_structure);
247

    
248
                        if(long_idx>31){
249
                            av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
250
                            return -1;
251
                        }
252
                        ref = h->long_ref[long_idx];
253
                        assert(!(ref && !ref->reference));
254
                        if(ref && (ref->reference & pic_structure)){
255
                            ref->pic_id= pic_id;
256
                            assert(ref->long_ref);
257
                            i=0;
258
                        }else{
259
                            i=-1;
260
                        }
261
                    }
262

    
263
                    if (i < 0) {
264
                        av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
265
                        memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
266
                    } else {
267
                        for(i=index; i+1<h->ref_count[list]; i++){
268
                            if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id)
269
                                break;
270
                        }
271
                        for(; i > index; i--){
272
                            h->ref_list[list][i]= h->ref_list[list][i-1];
273
                        }
274
                        h->ref_list[list][index]= *ref;
275
                        if (FIELD_PICTURE){
276
                            pic_as_field(&h->ref_list[list][index], pic_structure);
277
                        }
278
                    }
279
                }else{
280
                    av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
281
                    return -1;
282
                }
283
            }
284
        }
285
    }
286
    for(list=0; list<h->list_count; list++){
287
        for(index= 0; index < h->ref_count[list]; index++){
288
            if(!h->ref_list[list][index].data[0]){
289
                av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n");
290
                if(h->default_ref_list[list][0].data[0])
291
                    h->ref_list[list][index]= h->default_ref_list[list][0];
292
                else
293
                    return -1;
294
            }
295
        }
296
    }
297

    
298
    return 0;
299
}
300

    
301
void ff_h264_fill_mbaff_ref_list(H264Context *h){
302
    int list, i, j;
303
    for(list=0; list<2; list++){ //FIXME try list_count
304
        for(i=0; i<h->ref_count[list]; i++){
305
            Picture *frame = &h->ref_list[list][i];
306
            Picture *field = &h->ref_list[list][16+2*i];
307
            field[0] = *frame;
308
            for(j=0; j<3; j++)
309
                field[0].linesize[j] <<= 1;
310
            field[0].reference = PICT_TOP_FIELD;
311
            field[0].poc= field[0].field_poc[0];
312
            field[1] = field[0];
313
            for(j=0; j<3; j++)
314
                field[1].data[j] += frame->linesize[j];
315
            field[1].reference = PICT_BOTTOM_FIELD;
316
            field[1].poc= field[1].field_poc[1];
317

    
318
            h->luma_weight[16+2*i][list][0] = h->luma_weight[16+2*i+1][list][0] = h->luma_weight[i][list][0];
319
            h->luma_weight[16+2*i][list][1] = h->luma_weight[16+2*i+1][list][1] = h->luma_weight[i][list][1];
320
            for(j=0; j<2; j++){
321
                h->chroma_weight[16+2*i][list][j][0] = h->chroma_weight[16+2*i+1][list][j][0] = h->chroma_weight[i][list][j][0];
322
                h->chroma_weight[16+2*i][list][j][1] = h->chroma_weight[16+2*i+1][list][j][1] = h->chroma_weight[i][list][j][1];
323
            }
324
        }
325
    }
326
}
327

    
328
/**
329
 * Mark a picture as no longer needed for reference. The refmask
330
 * argument allows unreferencing of individual fields or the whole frame.
331
 * If the picture becomes entirely unreferenced, but is being held for
332
 * display purposes, it is marked as such.
333
 * @param refmask mask of fields to unreference; the mask is bitwise
334
 *                anded with the reference marking of pic
335
 * @return non-zero if pic becomes entirely unreferenced (except possibly
336
 *         for display purposes) zero if one of the fields remains in
337
 *         reference
338
 */
339
static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){
340
    int i;
341
    if (pic->reference &= refmask) {
342
        return 0;
343
    } else {
344
        for(i = 0; h->delayed_pic[i]; i++)
345
            if(pic == h->delayed_pic[i]){
346
                pic->reference=DELAYED_PIC_REF;
347
                break;
348
            }
349
        return 1;
350
    }
351
}
352

    
353
/**
354
 * Find a Picture in the short term reference list by frame number.
355
 * @param frame_num frame number to search for
356
 * @param idx the index into h->short_ref where returned picture is found
357
 *            undefined if no picture found.
358
 * @return pointer to the found picture, or NULL if no pic with the provided
359
 *                 frame number is found
360
 */
361
static Picture * find_short(H264Context *h, int frame_num, int *idx){
362
    MpegEncContext * const s = &h->s;
363
    int i;
364

    
365
    for(i=0; i<h->short_ref_count; i++){
366
        Picture *pic= h->short_ref[i];
367
        if(s->avctx->debug&FF_DEBUG_MMCO)
368
            av_log(h->s.avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
369
        if(pic->frame_num == frame_num) {
370
            *idx = i;
371
            return pic;
372
        }
373
    }
374
    return NULL;
375
}
376

    
377
/**
378
 * Remove a picture from the short term reference list by its index in
379
 * that list.  This does no checking on the provided index; it is assumed
380
 * to be valid. Other list entries are shifted down.
381
 * @param i index into h->short_ref of picture to remove.
382
 */
383
static void remove_short_at_index(H264Context *h, int i){
384
    assert(i >= 0 && i < h->short_ref_count);
385
    h->short_ref[i]= NULL;
386
    if (--h->short_ref_count)
387
        memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*));
388
}
389

    
390
/**
391
 *
392
 * @return the removed picture or NULL if an error occurs
393
 */
394
static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){
395
    MpegEncContext * const s = &h->s;
396
    Picture *pic;
397
    int i;
398

    
399
    if(s->avctx->debug&FF_DEBUG_MMCO)
400
        av_log(h->s.avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
401

    
402
    pic = find_short(h, frame_num, &i);
403
    if (pic){
404
        if(unreference_pic(h, pic, ref_mask))
405
        remove_short_at_index(h, i);
406
    }
407

    
408
    return pic;
409
}
410

    
411
/**
412
 * Remove a picture from the long term reference list by its index in
413
 * that list.
414
 * @return the removed picture or NULL if an error occurs
415
 */
416
static Picture * remove_long(H264Context *h, int i, int ref_mask){
417
    Picture *pic;
418

    
419
    pic= h->long_ref[i];
420
    if (pic){
421
        if(unreference_pic(h, pic, ref_mask)){
422
            assert(h->long_ref[i]->long_ref == 1);
423
            h->long_ref[i]->long_ref= 0;
424
            h->long_ref[i]= NULL;
425
            h->long_ref_count--;
426
        }
427
    }
428

    
429
    return pic;
430
}
431

    
432
void ff_h264_remove_all_refs(H264Context *h){
433
    int i;
434

    
435
    for(i=0; i<16; i++){
436
        remove_long(h, i, 0);
437
    }
438
    assert(h->long_ref_count==0);
439

    
440
    for(i=0; i<h->short_ref_count; i++){
441
        unreference_pic(h, h->short_ref[i], 0);
442
        h->short_ref[i]= NULL;
443
    }
444
    h->short_ref_count=0;
445
}
446

    
447
/**
448
 * print short term list
449
 */
450
static void print_short_term(H264Context *h) {
451
    uint32_t i;
452
    if(h->s.avctx->debug&FF_DEBUG_MMCO) {
453
        av_log(h->s.avctx, AV_LOG_DEBUG, "short term list:\n");
454
        for(i=0; i<h->short_ref_count; i++){
455
            Picture *pic= h->short_ref[i];
456
            av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
457
        }
458
    }
459
}
460

    
461
/**
462
 * print long term list
463
 */
464
static void print_long_term(H264Context *h) {
465
    uint32_t i;
466
    if(h->s.avctx->debug&FF_DEBUG_MMCO) {
467
        av_log(h->s.avctx, AV_LOG_DEBUG, "long term list:\n");
468
        for(i = 0; i < 16; i++){
469
            Picture *pic= h->long_ref[i];
470
            if (pic) {
471
                av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
472
            }
473
        }
474
    }
475
}
476

    
477
void ff_generate_sliding_window_mmcos(H264Context *h) {
478
    MpegEncContext * const s = &h->s;
479
    assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
480

    
481
    h->mmco_index= 0;
482
    if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
483
            !(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) {
484
        h->mmco[0].opcode= MMCO_SHORT2UNUSED;
485
        h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num;
486
        h->mmco_index= 1;
487
        if (FIELD_PICTURE) {
488
            h->mmco[0].short_pic_num *= 2;
489
            h->mmco[1].opcode= MMCO_SHORT2UNUSED;
490
            h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1;
491
            h->mmco_index= 2;
492
        }
493
    }
494
}
495

    
496
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){
497
    MpegEncContext * const s = &h->s;
498
    int i, av_uninit(j);
499
    int current_ref_assigned=0;
500
    Picture *av_uninit(pic);
501

    
502
    if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0)
503
        av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n");
504

    
505
    for(i=0; i<mmco_count; i++){
506
        int av_uninit(structure), av_uninit(frame_num);
507
        if(s->avctx->debug&FF_DEBUG_MMCO)
508
            av_log(h->s.avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, h->mmco[i].short_pic_num, h->mmco[i].long_arg);
509

    
510
        if(   mmco[i].opcode == MMCO_SHORT2UNUSED
511
           || mmco[i].opcode == MMCO_SHORT2LONG){
512
            frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
513
            pic = find_short(h, frame_num, &j);
514
            if(!pic){
515
                if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg]
516
                   || h->long_ref[mmco[i].long_arg]->frame_num != frame_num)
517
                av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
518
                continue;
519
            }
520
        }
521

    
522
        switch(mmco[i].opcode){
523
        case MMCO_SHORT2UNUSED:
524
            if(s->avctx->debug&FF_DEBUG_MMCO)
525
                av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", h->mmco[i].short_pic_num, h->short_ref_count);
526
            remove_short(h, frame_num, structure ^ PICT_FRAME);
527
            break;
528
        case MMCO_SHORT2LONG:
529
                if (h->long_ref[mmco[i].long_arg] != pic)
530
                    remove_long(h, mmco[i].long_arg, 0);
531

    
532
                remove_short_at_index(h, j);
533
                h->long_ref[ mmco[i].long_arg ]= pic;
534
                if (h->long_ref[ mmco[i].long_arg ]){
535
                    h->long_ref[ mmco[i].long_arg ]->long_ref=1;
536
                    h->long_ref_count++;
537
                }
538
            break;
539
        case MMCO_LONG2UNUSED:
540
            j = pic_num_extract(h, mmco[i].long_arg, &structure);
541
            pic = h->long_ref[j];
542
            if (pic) {
543
                remove_long(h, j, structure ^ PICT_FRAME);
544
            } else if(s->avctx->debug&FF_DEBUG_MMCO)
545
                av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
546
            break;
547
        case MMCO_LONG:
548
                    // Comment below left from previous code as it is an interresting note.
549
                    /* First field in pair is in short term list or
550
                     * at a different long term index.
551
                     * This is not allowed; see 7.4.3.3, notes 2 and 3.
552
                     * Report the problem and keep the pair where it is,
553
                     * and mark this field valid.
554
                     */
555

    
556
            if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) {
557
                remove_long(h, mmco[i].long_arg, 0);
558

    
559
                h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr;
560
                h->long_ref[ mmco[i].long_arg ]->long_ref=1;
561
                h->long_ref_count++;
562
            }
563

    
564
            s->current_picture_ptr->reference |= s->picture_structure;
565
            current_ref_assigned=1;
566
            break;
567
        case MMCO_SET_MAX_LONG:
568
            assert(mmco[i].long_arg <= 16);
569
            // just remove the long term which index is greater than new max
570
            for(j = mmco[i].long_arg; j<16; j++){
571
                remove_long(h, j, 0);
572
            }
573
            break;
574
        case MMCO_RESET:
575
            while(h->short_ref_count){
576
                remove_short(h, h->short_ref[0]->frame_num, 0);
577
            }
578
            for(j = 0; j < 16; j++) {
579
                remove_long(h, j, 0);
580
            }
581
            s->current_picture_ptr->poc=
582
            s->current_picture_ptr->field_poc[0]=
583
            s->current_picture_ptr->field_poc[1]=
584
            h->poc_lsb=
585
            h->poc_msb=
586
            h->frame_num=
587
            s->current_picture_ptr->frame_num= 0;
588
            s->current_picture_ptr->mmco_reset=1;
589
            break;
590
        default: assert(0);
591
        }
592
    }
593

    
594
    if (!current_ref_assigned) {
595
        /* Second field of complementary field pair; the first field of
596
         * which is already referenced. If short referenced, it
597
         * should be first entry in short_ref. If not, it must exist
598
         * in long_ref; trying to put it on the short list here is an
599
         * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
600
         */
601
        if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) {
602
            /* Just mark the second field valid */
603
            s->current_picture_ptr->reference = PICT_FRAME;
604
        } else if (s->current_picture_ptr->long_ref) {
605
            av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference "
606
                                             "assignment for second field "
607
                                             "in complementary field pair "
608
                                             "(first field is long term)\n");
609
        } else {
610
            pic= remove_short(h, s->current_picture_ptr->frame_num, 0);
611
            if(pic){
612
                av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
613
            }
614

    
615
            if(h->short_ref_count)
616
                memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*));
617

    
618
            h->short_ref[0]= s->current_picture_ptr;
619
            h->short_ref_count++;
620
            s->current_picture_ptr->reference |= s->picture_structure;
621
        }
622
    }
623

    
624
    if (h->long_ref_count + h->short_ref_count > h->sps.ref_frame_count){
625

    
626
        /* We have too many reference frames, probably due to corrupted
627
         * stream. Need to discard one frame. Prevents overrun of the
628
         * short_ref and long_ref buffers.
629
         */
630
        av_log(h->s.avctx, AV_LOG_ERROR,
631
               "number of reference frames exceeds max (probably "
632
               "corrupt input), discarding one\n");
633

    
634
        if (h->long_ref_count && !h->short_ref_count) {
635
            for (i = 0; i < 16; ++i)
636
                if (h->long_ref[i])
637
                    break;
638

    
639
            assert(i < 16);
640
            remove_long(h, i, 0);
641
        } else {
642
            pic = h->short_ref[h->short_ref_count - 1];
643
            remove_short(h, pic->frame_num, 0);
644
        }
645
    }
646

    
647
    print_short_term(h);
648
    print_long_term(h);
649
    return 0;
650
}
651

    
652
int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb){
653
    MpegEncContext * const s = &h->s;
654
    int i;
655

    
656
    h->mmco_index= 0;
657
    if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
658
        s->broken_link= get_bits1(gb) -1;
659
        if(get_bits1(gb)){
660
            h->mmco[0].opcode= MMCO_LONG;
661
            h->mmco[0].long_arg= 0;
662
            h->mmco_index= 1;
663
        }
664
    }else{
665
        if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag
666
            for(i= 0; i<MAX_MMCO_COUNT; i++) {
667
                MMCOOpcode opcode= get_ue_golomb_31(gb);
668

    
669
                h->mmco[i].opcode= opcode;
670
                if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){
671
                    h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1);
672
/*                    if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){
673
                        av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco);
674
                        return -1;
675
                    }*/
676
                }
677
                if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){
678
                    unsigned int long_arg= get_ue_golomb_31(gb);
679
                    if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){
680
                        av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode);
681
                        return -1;
682
                    }
683
                    h->mmco[i].long_arg= long_arg;
684
                }
685

    
686
                if(opcode > (unsigned)MMCO_LONG){
687
                    av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode);
688
                    return -1;
689
                }
690
                if(opcode == MMCO_END)
691
                    break;
692
            }
693
            h->mmco_index= i;
694
        }else{
695
            ff_generate_sliding_window_mmcos(h);
696
        }
697
    }
698

    
699
    return 0;
700
}