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ffmpeg / libavcodec / h264_refs.c @ 0ae4aba6

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/*
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 * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
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 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * H.264 / AVC / MPEG4 part10  reference picture handling.
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 * @author Michael Niedermayer <michaelni@gmx.at>
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 */
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#include "libavutil/avassert.h"
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#include "internal.h"
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#include "dsputil.h"
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#include "avcodec.h"
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#include "h264.h"
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#include "golomb.h"
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35
//#undef NDEBUG
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#include <assert.h>
37

    
38

    
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static void pic_as_field(Picture *pic, const int parity){
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    int i;
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    for (i = 0; i < 4; ++i) {
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        if (parity == PICT_BOTTOM_FIELD)
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            pic->data[i] += pic->linesize[i];
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        pic->reference = parity;
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        pic->linesize[i] *= 2;
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    }
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    pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
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}
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static int split_field_copy(Picture *dest, Picture *src,
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                            int parity, int id_add){
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    int match = !!(src->reference & parity);
53

    
54
    if (match) {
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        *dest = *src;
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        if(parity != PICT_FRAME){
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            pic_as_field(dest, parity);
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            dest->pic_id *= 2;
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            dest->pic_id += id_add;
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        }
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    }
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    return match;
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}
65

    
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static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){
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    int i[2]={0};
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    int index=0;
69

    
70
    while(i[0]<len || i[1]<len){
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        while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel)))
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            i[0]++;
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        while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3))))
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            i[1]++;
75
        if(i[0] < len){
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            in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num;
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            split_field_copy(&def[index++], in[ i[0]++ ], sel  , 1);
78
        }
79
        if(i[1] < len){
80
            in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num;
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            split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0);
82
        }
83
    }
84

    
85
    return index;
86
}
87

    
88
static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){
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    int i, best_poc;
90
    int out_i= 0;
91

    
92
    for(;;){
93
        best_poc= dir ? INT_MIN : INT_MAX;
94

    
95
        for(i=0; i<len; i++){
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            const int poc= src[i]->poc;
97
            if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){
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                best_poc= poc;
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                sorted[out_i]= src[i];
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            }
101
        }
102
        if(best_poc == (dir ? INT_MIN : INT_MAX))
103
            break;
104
        limit= sorted[out_i++]->poc - dir;
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    }
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    return out_i;
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}
108

    
109
int ff_h264_fill_default_ref_list(H264Context *h){
110
    MpegEncContext * const s = &h->s;
111
    int i, len;
112

    
113
    if(h->slice_type_nos==FF_B_TYPE){
114
        Picture *sorted[32];
115
        int cur_poc, list;
116
        int lens[2];
117

    
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        if(FIELD_PICTURE)
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            cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];
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        else
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            cur_poc= s->current_picture_ptr->poc;
122

    
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        for(list= 0; list<2; list++){
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            len= add_sorted(sorted    , h->short_ref, h->short_ref_count, cur_poc, 1^list);
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            len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list);
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            assert(len<=32);
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            len= build_def_list(h->default_ref_list[list]    , sorted     , len, 0, s->picture_structure);
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            len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure);
129
            assert(len<=32);
130

    
131
            if(len < h->ref_count[list])
132
                memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
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            lens[list]= len;
134
        }
135

    
136
        if(lens[0] == lens[1] && lens[1] > 1){
137
            for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
138
            if(i == lens[0])
139
                FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
140
        }
141
    }else{
142
        len = build_def_list(h->default_ref_list[0]    , h->short_ref, h->short_ref_count, 0, s->picture_structure);
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        len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16                , 1, s->picture_structure);
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        assert(len <= 32);
145
        if(len < h->ref_count[0])
146
            memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));
147
    }
148
#ifdef TRACE
149
    for (i=0; i<h->ref_count[0]; i++) {
150
        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]);
151
    }
152
    if(h->slice_type_nos==FF_B_TYPE){
153
        for (i=0; i<h->ref_count[1]; i++) {
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            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]);
155
        }
156
    }
157
#endif
158
    return 0;
159
}
160

    
161
static void print_short_term(H264Context *h);
162
static void print_long_term(H264Context *h);
163

    
164
/**
165
 * Extract structure information about the picture described by pic_num in
166
 * the current decoding context (frame or field). Note that pic_num is
167
 * picture number without wrapping (so, 0<=pic_num<max_pic_num).
168
 * @param pic_num picture number for which to extract structure information
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 * @param structure one of PICT_XXX describing structure of picture
170
 *                      with pic_num
171
 * @return frame number (short term) or long term index of picture
172
 *         described by pic_num
173
 */
174
static int pic_num_extract(H264Context *h, int pic_num, int *structure){
175
    MpegEncContext * const s = &h->s;
176

    
177
    *structure = s->picture_structure;
178
    if(FIELD_PICTURE){
179
        if (!(pic_num & 1))
180
            /* opposite field */
181
            *structure ^= PICT_FRAME;
182
        pic_num >>= 1;
183
    }
184

    
185
    return pic_num;
186
}
187

    
188
int ff_h264_decode_ref_pic_list_reordering(H264Context *h){
189
    MpegEncContext * const s = &h->s;
190
    int list, index, pic_structure;
191

    
192
    print_short_term(h);
193
    print_long_term(h);
194

    
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    for(list=0; list<h->list_count; list++){
196
        memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]);
197

    
198
        if(get_bits1(&s->gb)){
199
            int pred= h->curr_pic_num;
200

    
201
            for(index=0; ; index++){
202
                unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb);
203
                unsigned int pic_id;
204
                int i;
205
                Picture *ref = NULL;
206

    
207
                if(reordering_of_pic_nums_idc==3)
208
                    break;
209

    
210
                if(index >= h->ref_count[list]){
211
                    av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n");
212
                    return -1;
213
                }
214

    
215
                if(reordering_of_pic_nums_idc<3){
216
                    if(reordering_of_pic_nums_idc<2){
217
                        const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1;
218
                        int frame_num;
219

    
220
                        if(abs_diff_pic_num > h->max_pic_num){
221
                            av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
222
                            return -1;
223
                        }
224

    
225
                        if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num;
226
                        else                                pred+= abs_diff_pic_num;
227
                        pred &= h->max_pic_num - 1;
228

    
229
                        frame_num = pic_num_extract(h, pred, &pic_structure);
230

    
231
                        for(i= h->short_ref_count-1; i>=0; i--){
232
                            ref = h->short_ref[i];
233
                            assert(ref->reference);
234
                            assert(!ref->long_ref);
235
                            if(
236
                                   ref->frame_num == frame_num &&
237
                                   (ref->reference & pic_structure)
238
                              )
239
                                break;
240
                        }
241
                        if(i>=0)
242
                            ref->pic_id= pred;
243
                    }else{
244
                        int long_idx;
245
                        pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx
246

    
247
                        long_idx= pic_num_extract(h, pic_id, &pic_structure);
248

    
249
                        if(long_idx>31){
250
                            av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
251
                            return -1;
252
                        }
253
                        ref = h->long_ref[long_idx];
254
                        assert(!(ref && !ref->reference));
255
                        if(ref && (ref->reference & pic_structure)){
256
                            ref->pic_id= pic_id;
257
                            assert(ref->long_ref);
258
                            i=0;
259
                        }else{
260
                            i=-1;
261
                        }
262
                    }
263

    
264
                    if (i < 0) {
265
                        av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
266
                        memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
267
                    } else {
268
                        for(i=index; i+1<h->ref_count[list]; i++){
269
                            if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id)
270
                                break;
271
                        }
272
                        for(; i > index; i--){
273
                            h->ref_list[list][i]= h->ref_list[list][i-1];
274
                        }
275
                        h->ref_list[list][index]= *ref;
276
                        if (FIELD_PICTURE){
277
                            pic_as_field(&h->ref_list[list][index], pic_structure);
278
                        }
279
                    }
280
                }else{
281
                    av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
282
                    return -1;
283
                }
284
            }
285
        }
286
    }
287
    for(list=0; list<h->list_count; list++){
288
        for(index= 0; index < h->ref_count[list]; index++){
289
            if(!h->ref_list[list][index].data[0]){
290
                av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n");
291
                if(h->default_ref_list[list][0].data[0])
292
                    h->ref_list[list][index]= h->default_ref_list[list][0];
293
                else
294
                    return -1;
295
            }
296
        }
297
    }
298

    
299
    return 0;
300
}
301

    
302
void ff_h264_fill_mbaff_ref_list(H264Context *h){
303
    int list, i, j;
304
    for(list=0; list<2; list++){ //FIXME try list_count
305
        for(i=0; i<h->ref_count[list]; i++){
306
            Picture *frame = &h->ref_list[list][i];
307
            Picture *field = &h->ref_list[list][16+2*i];
308
            field[0] = *frame;
309
            for(j=0; j<3; j++)
310
                field[0].linesize[j] <<= 1;
311
            field[0].reference = PICT_TOP_FIELD;
312
            field[0].poc= field[0].field_poc[0];
313
            field[1] = field[0];
314
            for(j=0; j<3; j++)
315
                field[1].data[j] += frame->linesize[j];
316
            field[1].reference = PICT_BOTTOM_FIELD;
317
            field[1].poc= field[1].field_poc[1];
318

    
319
            h->luma_weight[16+2*i][list][0] = h->luma_weight[16+2*i+1][list][0] = h->luma_weight[i][list][0];
320
            h->luma_weight[16+2*i][list][1] = h->luma_weight[16+2*i+1][list][1] = h->luma_weight[i][list][1];
321
            for(j=0; j<2; j++){
322
                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];
323
                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];
324
            }
325
        }
326
    }
327
}
328

    
329
/**
330
 * Mark a picture as no longer needed for reference. The refmask
331
 * argument allows unreferencing of individual fields or the whole frame.
332
 * If the picture becomes entirely unreferenced, but is being held for
333
 * display purposes, it is marked as such.
334
 * @param refmask mask of fields to unreference; the mask is bitwise
335
 *                anded with the reference marking of pic
336
 * @return non-zero if pic becomes entirely unreferenced (except possibly
337
 *         for display purposes) zero if one of the fields remains in
338
 *         reference
339
 */
340
static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){
341
    int i;
342
    if (pic->reference &= refmask) {
343
        return 0;
344
    } else {
345
        for(i = 0; h->delayed_pic[i]; i++)
346
            if(pic == h->delayed_pic[i]){
347
                pic->reference=DELAYED_PIC_REF;
348
                break;
349
            }
350
        return 1;
351
    }
352
}
353

    
354
/**
355
 * Find a Picture in the short term reference list by frame number.
356
 * @param frame_num frame number to search for
357
 * @param idx the index into h->short_ref where returned picture is found
358
 *            undefined if no picture found.
359
 * @return pointer to the found picture, or NULL if no pic with the provided
360
 *                 frame number is found
361
 */
362
static Picture * find_short(H264Context *h, int frame_num, int *idx){
363
    MpegEncContext * const s = &h->s;
364
    int i;
365

    
366
    for(i=0; i<h->short_ref_count; i++){
367
        Picture *pic= h->short_ref[i];
368
        if(s->avctx->debug&FF_DEBUG_MMCO)
369
            av_log(h->s.avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);
370
        if(pic->frame_num == frame_num) {
371
            *idx = i;
372
            return pic;
373
        }
374
    }
375
    return NULL;
376
}
377

    
378
/**
379
 * Remove a picture from the short term reference list by its index in
380
 * that list.  This does no checking on the provided index; it is assumed
381
 * to be valid. Other list entries are shifted down.
382
 * @param i index into h->short_ref of picture to remove.
383
 */
384
static void remove_short_at_index(H264Context *h, int i){
385
    assert(i >= 0 && i < h->short_ref_count);
386
    h->short_ref[i]= NULL;
387
    if (--h->short_ref_count)
388
        memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*));
389
}
390

    
391
/**
392
 *
393
 * @return the removed picture or NULL if an error occurs
394
 */
395
static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){
396
    MpegEncContext * const s = &h->s;
397
    Picture *pic;
398
    int i;
399

    
400
    if(s->avctx->debug&FF_DEBUG_MMCO)
401
        av_log(h->s.avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
402

    
403
    pic = find_short(h, frame_num, &i);
404
    if (pic){
405
        if(unreference_pic(h, pic, ref_mask))
406
        remove_short_at_index(h, i);
407
    }
408

    
409
    return pic;
410
}
411

    
412
/**
413
 * Remove a picture from the long term reference list by its index in
414
 * that list.
415
 * @return the removed picture or NULL if an error occurs
416
 */
417
static Picture * remove_long(H264Context *h, int i, int ref_mask){
418
    Picture *pic;
419

    
420
    pic= h->long_ref[i];
421
    if (pic){
422
        if(unreference_pic(h, pic, ref_mask)){
423
            assert(h->long_ref[i]->long_ref == 1);
424
            h->long_ref[i]->long_ref= 0;
425
            h->long_ref[i]= NULL;
426
            h->long_ref_count--;
427
        }
428
    }
429

    
430
    return pic;
431
}
432

    
433
void ff_h264_remove_all_refs(H264Context *h){
434
    int i;
435

    
436
    for(i=0; i<16; i++){
437
        remove_long(h, i, 0);
438
    }
439
    assert(h->long_ref_count==0);
440

    
441
    for(i=0; i<h->short_ref_count; i++){
442
        unreference_pic(h, h->short_ref[i], 0);
443
        h->short_ref[i]= NULL;
444
    }
445
    h->short_ref_count=0;
446
}
447

    
448
/**
449
 * print short term list
450
 */
451
static void print_short_term(H264Context *h) {
452
    uint32_t i;
453
    if(h->s.avctx->debug&FF_DEBUG_MMCO) {
454
        av_log(h->s.avctx, AV_LOG_DEBUG, "short term list:\n");
455
        for(i=0; i<h->short_ref_count; i++){
456
            Picture *pic= h->short_ref[i];
457
            av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
458
        }
459
    }
460
}
461

    
462
/**
463
 * print long term list
464
 */
465
static void print_long_term(H264Context *h) {
466
    uint32_t i;
467
    if(h->s.avctx->debug&FF_DEBUG_MMCO) {
468
        av_log(h->s.avctx, AV_LOG_DEBUG, "long term list:\n");
469
        for(i = 0; i < 16; i++){
470
            Picture *pic= h->long_ref[i];
471
            if (pic) {
472
                av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
473
            }
474
        }
475
    }
476
}
477

    
478
void ff_generate_sliding_window_mmcos(H264Context *h) {
479
    MpegEncContext * const s = &h->s;
480
    av_assert0(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
481

    
482
    h->mmco_index= 0;
483
    if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
484
            !(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) {
485
        h->mmco[0].opcode= MMCO_SHORT2UNUSED;
486
        h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num;
487
        h->mmco_index= 1;
488
        if (FIELD_PICTURE) {
489
            h->mmco[0].short_pic_num *= 2;
490
            h->mmco[1].opcode= MMCO_SHORT2UNUSED;
491
            h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1;
492
            h->mmco_index= 2;
493
        }
494
    }
495
}
496

    
497
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){
498
    MpegEncContext * const s = &h->s;
499
    int i, av_uninit(j);
500
    int current_ref_assigned=0;
501
    Picture *av_uninit(pic);
502

    
503
    if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0)
504
        av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n");
505

    
506
    for(i=0; i<mmco_count; i++){
507
        int av_uninit(structure), av_uninit(frame_num);
508
        if(s->avctx->debug&FF_DEBUG_MMCO)
509
            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);
510

    
511
        if(   mmco[i].opcode == MMCO_SHORT2UNUSED
512
           || mmco[i].opcode == MMCO_SHORT2LONG){
513
            frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
514
            pic = find_short(h, frame_num, &j);
515
            if(!pic){
516
                if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg]
517
                   || h->long_ref[mmco[i].long_arg]->frame_num != frame_num)
518
                av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
519
                continue;
520
            }
521
        }
522

    
523
        switch(mmco[i].opcode){
524
        case MMCO_SHORT2UNUSED:
525
            if(s->avctx->debug&FF_DEBUG_MMCO)
526
                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);
527
            remove_short(h, frame_num, structure ^ PICT_FRAME);
528
            break;
529
        case MMCO_SHORT2LONG:
530
                if (h->long_ref[mmco[i].long_arg] != pic)
531
                    remove_long(h, mmco[i].long_arg, 0);
532

    
533
                remove_short_at_index(h, j);
534
                h->long_ref[ mmco[i].long_arg ]= pic;
535
                if (h->long_ref[ mmco[i].long_arg ]){
536
                    h->long_ref[ mmco[i].long_arg ]->long_ref=1;
537
                    h->long_ref_count++;
538
                }
539
            break;
540
        case MMCO_LONG2UNUSED:
541
            j = pic_num_extract(h, mmco[i].long_arg, &structure);
542
            pic = h->long_ref[j];
543
            if (pic) {
544
                remove_long(h, j, structure ^ PICT_FRAME);
545
            } else if(s->avctx->debug&FF_DEBUG_MMCO)
546
                av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
547
            break;
548
        case MMCO_LONG:
549
                    // Comment below left from previous code as it is an interresting note.
550
                    /* First field in pair is in short term list or
551
                     * at a different long term index.
552
                     * This is not allowed; see 7.4.3.3, notes 2 and 3.
553
                     * Report the problem and keep the pair where it is,
554
                     * and mark this field valid.
555
                     */
556

    
557
            if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) {
558
                remove_long(h, mmco[i].long_arg, 0);
559

    
560
                h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr;
561
                h->long_ref[ mmco[i].long_arg ]->long_ref=1;
562
                h->long_ref_count++;
563
            }
564

    
565
            s->current_picture_ptr->reference |= s->picture_structure;
566
            current_ref_assigned=1;
567
            break;
568
        case MMCO_SET_MAX_LONG:
569
            assert(mmco[i].long_arg <= 16);
570
            // just remove the long term which index is greater than new max
571
            for(j = mmco[i].long_arg; j<16; j++){
572
                remove_long(h, j, 0);
573
            }
574
            break;
575
        case MMCO_RESET:
576
            while(h->short_ref_count){
577
                remove_short(h, h->short_ref[0]->frame_num, 0);
578
            }
579
            for(j = 0; j < 16; j++) {
580
                remove_long(h, j, 0);
581
            }
582
            s->current_picture_ptr->poc=
583
            s->current_picture_ptr->field_poc[0]=
584
            s->current_picture_ptr->field_poc[1]=
585
            h->poc_lsb=
586
            h->poc_msb=
587
            h->frame_num=
588
            s->current_picture_ptr->frame_num= 0;
589
            s->current_picture_ptr->mmco_reset=1;
590
            break;
591
        default: assert(0);
592
        }
593
    }
594

    
595
    if (!current_ref_assigned) {
596
        /* Second field of complementary field pair; the first field of
597
         * which is already referenced. If short referenced, it
598
         * should be first entry in short_ref. If not, it must exist
599
         * in long_ref; trying to put it on the short list here is an
600
         * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
601
         */
602
        if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) {
603
            /* Just mark the second field valid */
604
            s->current_picture_ptr->reference = PICT_FRAME;
605
        } else if (s->current_picture_ptr->long_ref) {
606
            av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference "
607
                                             "assignment for second field "
608
                                             "in complementary field pair "
609
                                             "(first field is long term)\n");
610
        } else {
611
            pic= remove_short(h, s->current_picture_ptr->frame_num, 0);
612
            if(pic){
613
                av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
614
            }
615

    
616
            if(h->short_ref_count)
617
                memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*));
618

    
619
            h->short_ref[0]= s->current_picture_ptr;
620
            h->short_ref_count++;
621
            s->current_picture_ptr->reference |= s->picture_structure;
622
        }
623
    }
624

    
625
    if (h->long_ref_count + h->short_ref_count > h->sps.ref_frame_count){
626

    
627
        /* We have too many reference frames, probably due to corrupted
628
         * stream. Need to discard one frame. Prevents overrun of the
629
         * short_ref and long_ref buffers.
630
         */
631
        av_log(h->s.avctx, AV_LOG_ERROR,
632
               "number of reference frames exceeds max (probably "
633
               "corrupt input), discarding one long:%d short:%d max:%d\n", h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count);
634

    
635
        if (h->long_ref_count && !h->short_ref_count) {
636
            for (i = 0; i < 16; ++i)
637
                if (h->long_ref[i])
638
                    break;
639

    
640
            assert(i < 16);
641
            remove_long(h, i, 0);
642
        } else {
643
            pic = h->short_ref[h->short_ref_count - 1];
644
            remove_short(h, pic->frame_num, 0);
645
        }
646
    }
647

    
648
    print_short_term(h);
649
    print_long_term(h);
650
    return 0;
651
}
652

    
653
int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb){
654
    MpegEncContext * const s = &h->s;
655
    int i;
656

    
657
    h->mmco_index= 0;
658
    if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
659
        s->broken_link= get_bits1(gb) -1;
660
        if(get_bits1(gb)){
661
            h->mmco[0].opcode= MMCO_LONG;
662
            h->mmco[0].long_arg= 0;
663
            h->mmco_index= 1;
664
        }
665
    }else{
666
        if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag
667
            for(i= 0; i<MAX_MMCO_COUNT; i++) {
668
                MMCOOpcode opcode= get_ue_golomb_31(gb);
669

    
670
                h->mmco[i].opcode= opcode;
671
                if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){
672
                    h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1);
673
/*                    if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){
674
                        av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco);
675
                        return -1;
676
                    }*/
677
                }
678
                if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){
679
                    unsigned int long_arg= get_ue_golomb_31(gb);
680
                    if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){
681
                        av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode);
682
                        return -1;
683
                    }
684
                    h->mmco[i].long_arg= long_arg;
685
                }
686

    
687
                if(opcode > (unsigned)MMCO_LONG){
688
                    av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode);
689
                    return -1;
690
                }
691
                if(opcode == MMCO_END)
692
                    break;
693
            }
694
            h->mmco_index= i;
695
        }else{
696
            ff_generate_sliding_window_mmcos(h);
697
        }
698
    }
699

    
700
    return 0;
701
}