2
* H.26L/H.264/AVC/JVT/14496-10/... reference picture handling
3
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
8
* 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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* FFmpeg is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* Lesser General Public License for more details.
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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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* H.264 / AVC / MPEG4 part10 reference picture handling.
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* @author Michael Niedermayer <michaelni@gmx.at>
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static void pic_as_field(Picture *pic, const int parity){
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;
46
pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];
49
static int split_field_copy(Picture *dest, Picture *src,
50
int parity, int id_add){
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int match = !!(src->reference & parity);
55
if(parity != PICT_FRAME){
56
pic_as_field(dest, parity);
58
dest->pic_id += id_add;
65
static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){
69
while(i[0]<len || i[1]<len){
70
while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel)))
72
while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3))))
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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);
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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);
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static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){
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best_poc= dir ? INT_MIN : INT_MAX;
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const int poc= src[i]->poc;
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if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){
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sorted[out_i]= src[i];
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if(best_poc == (dir ? INT_MIN : INT_MAX))
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limit= sorted[out_i++]->poc - dir;
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int ff_h264_fill_default_ref_list(H264Context *h){
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MpegEncContext * const s = &h->s;
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if(h->slice_type_nos==FF_B_TYPE){
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cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];
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cur_poc= s->current_picture_ptr->poc;
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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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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);
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if(len < h->ref_count[list])
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memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
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if(lens[0] == lens[1] && lens[1] > 1){
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for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
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FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
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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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if(len < h->ref_count[0])
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memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));
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for (i=0; i<h->ref_count[0]; i++) {
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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
if(h->slice_type_nos==FF_B_TYPE){
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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]);
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static void print_short_term(H264Context *h);
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static void print_long_term(H264Context *h);
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* Extract structure information about the picture described by pic_num in
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* the current decoding context (frame or field). Note that pic_num is
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* picture number without wrapping (so, 0<=pic_num<max_pic_num).
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* @param pic_num picture number for which to extract structure information
168
* @param structure one of PICT_XXX describing structure of picture
170
* @return frame number (short term) or long term index of picture
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* described by pic_num
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static int pic_num_extract(H264Context *h, int pic_num, int *structure){
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MpegEncContext * const s = &h->s;
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*structure = s->picture_structure;
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*structure ^= PICT_FRAME;
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int ff_h264_decode_ref_pic_list_reordering(H264Context *h){
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MpegEncContext * const s = &h->s;
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int list, index, pic_structure;
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for(list=0; list<h->list_count; list++){
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memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]);
197
if(get_bits1(&s->gb)){
198
int pred= h->curr_pic_num;
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for(index=0; ; index++){
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unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb);
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if(reordering_of_pic_nums_idc==3)
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if(index >= h->ref_count[list]){
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av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n");
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if(reordering_of_pic_nums_idc<3){
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if(reordering_of_pic_nums_idc<2){
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const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1;
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if(abs_diff_pic_num > h->max_pic_num){
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av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");
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if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num;
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else pred+= abs_diff_pic_num;
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pred &= h->max_pic_num - 1;
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frame_num = pic_num_extract(h, pred, &pic_structure);
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for(i= h->short_ref_count-1; i>=0; i--){
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ref = h->short_ref[i];
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assert(ref->reference);
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assert(!ref->long_ref);
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ref->frame_num == frame_num &&
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(ref->reference & pic_structure)
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pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx
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long_idx= pic_num_extract(h, pic_id, &pic_structure);
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av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
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ref = h->long_ref[long_idx];
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assert(!(ref && !ref->reference));
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if(ref && (ref->reference & pic_structure)){
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assert(ref->long_ref);
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av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");
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memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
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for(i=index; i+1<h->ref_count[list]; i++){
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if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id)
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for(; i > index; i--){
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h->ref_list[list][i]= h->ref_list[list][i-1];
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h->ref_list[list][index]= *ref;
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pic_as_field(&h->ref_list[list][index], pic_structure);
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av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");
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for(list=0; list<h->list_count; list++){
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for(index= 0; index < h->ref_count[list]; index++){
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if(!h->ref_list[list][index].data[0]){
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av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n");
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if(h->default_ref_list[list][0].data[0])
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h->ref_list[list][index]= h->default_ref_list[list][0];
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void ff_h264_fill_mbaff_ref_list(H264Context *h){
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for(list=0; list<2; list++){ //FIXME try list_count
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for(i=0; i<h->ref_count[list]; i++){
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Picture *frame = &h->ref_list[list][i];
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Picture *field = &h->ref_list[list][16+2*i];
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field[0].linesize[j] <<= 1;
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field[0].reference = PICT_TOP_FIELD;
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field[0].poc= field[0].field_poc[0];
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field[1].data[j] += frame->linesize[j];
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field[1].reference = PICT_BOTTOM_FIELD;
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field[1].poc= field[1].field_poc[1];
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h->luma_weight[16+2*i][list][0] = h->luma_weight[16+2*i+1][list][0] = h->luma_weight[i][list][0];
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h->luma_weight[16+2*i][list][1] = h->luma_weight[16+2*i+1][list][1] = h->luma_weight[i][list][1];
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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];
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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];
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* Mark a picture as no longer needed for reference. The refmask
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* argument allows unreferencing of individual fields or the whole frame.
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* If the picture becomes entirely unreferenced, but is being held for
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* display purposes, it is marked as such.
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* @param refmask mask of fields to unreference; the mask is bitwise
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* anded with the reference marking of pic
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* @return non-zero if pic becomes entirely unreferenced (except possibly
336
* for display purposes) zero if one of the fields remains in
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static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){
341
if (pic->reference &= refmask) {
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for(i = 0; h->delayed_pic[i]; i++)
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if(pic == h->delayed_pic[i]){
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pic->reference=DELAYED_PIC_REF;
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* Find a Picture in the short term reference list by frame number.
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* @param frame_num frame number to search for
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* @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
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* frame number is found
361
static Picture * find_short(H264Context *h, int frame_num, int *idx){
362
MpegEncContext * const s = &h->s;
365
for(i=0; i<h->short_ref_count; i++){
366
Picture *pic= h->short_ref[i];
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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);
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if(pic->frame_num == frame_num) {
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.
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*));
392
* @return the removed picture or NULL if an error occurs
394
static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){
395
MpegEncContext * const s = &h->s;
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);
402
pic = find_short(h, frame_num, &i);
404
if(unreference_pic(h, pic, ref_mask))
405
remove_short_at_index(h, i);
412
* Remove a picture from the long term reference list by its index in
414
* @return the removed picture or NULL if an error occurs
416
static Picture * remove_long(H264Context *h, int i, int ref_mask){
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;
432
void ff_h264_remove_all_refs(H264Context *h){
436
remove_long(h, i, 0);
438
assert(h->long_ref_count==0);
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;
444
h->short_ref_count=0;
448
* print short term list
450
static void print_short_term(H264Context *h) {
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]);
462
* print long term list
464
static void print_long_term(H264Context *h) {
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];
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]);
477
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){
478
MpegEncContext * const s = &h->s;
480
int current_ref_assigned=0;
481
Picture *av_uninit(pic);
483
if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0)
484
av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n");
486
for(i=0; i<mmco_count; i++){
487
int av_uninit(structure), av_uninit(frame_num);
488
if(s->avctx->debug&FF_DEBUG_MMCO)
489
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);
491
if( mmco[i].opcode == MMCO_SHORT2UNUSED
492
|| mmco[i].opcode == MMCO_SHORT2LONG){
493
frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
494
pic = find_short(h, frame_num, &j);
496
if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg]
497
|| h->long_ref[mmco[i].long_arg]->frame_num != frame_num)
498
av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
503
switch(mmco[i].opcode){
504
case MMCO_SHORT2UNUSED:
505
if(s->avctx->debug&FF_DEBUG_MMCO)
506
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);
507
remove_short(h, frame_num, structure ^ PICT_FRAME);
509
case MMCO_SHORT2LONG:
510
if (h->long_ref[mmco[i].long_arg] != pic)
511
remove_long(h, mmco[i].long_arg, 0);
513
remove_short_at_index(h, j);
514
h->long_ref[ mmco[i].long_arg ]= pic;
515
if (h->long_ref[ mmco[i].long_arg ]){
516
h->long_ref[ mmco[i].long_arg ]->long_ref=1;
520
case MMCO_LONG2UNUSED:
521
j = pic_num_extract(h, mmco[i].long_arg, &structure);
522
pic = h->long_ref[j];
524
remove_long(h, j, structure ^ PICT_FRAME);
525
} else if(s->avctx->debug&FF_DEBUG_MMCO)
526
av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");
529
// Comment below left from previous code as it is an interresting note.
530
/* First field in pair is in short term list or
531
* at a different long term index.
532
* This is not allowed; see 7.4.3.3, notes 2 and 3.
533
* Report the problem and keep the pair where it is,
534
* and mark this field valid.
537
if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) {
538
remove_long(h, mmco[i].long_arg, 0);
540
h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr;
541
h->long_ref[ mmco[i].long_arg ]->long_ref=1;
545
s->current_picture_ptr->reference |= s->picture_structure;
546
current_ref_assigned=1;
548
case MMCO_SET_MAX_LONG:
549
assert(mmco[i].long_arg <= 16);
550
// just remove the long term which index is greater than new max
551
for(j = mmco[i].long_arg; j<16; j++){
552
remove_long(h, j, 0);
556
while(h->short_ref_count){
557
remove_short(h, h->short_ref[0]->frame_num, 0);
559
for(j = 0; j < 16; j++) {
560
remove_long(h, j, 0);
562
s->current_picture_ptr->poc=
563
s->current_picture_ptr->field_poc[0]=
564
s->current_picture_ptr->field_poc[1]=
568
s->current_picture_ptr->frame_num= 0;
569
s->current_picture_ptr->mmco_reset=1;
575
if (!current_ref_assigned) {
576
/* Second field of complementary field pair; the first field of
577
* which is already referenced. If short referenced, it
578
* should be first entry in short_ref. If not, it must exist
579
* in long_ref; trying to put it on the short list here is an
580
* error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).
582
if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) {
583
/* Just mark the second field valid */
584
s->current_picture_ptr->reference = PICT_FRAME;
585
} else if (s->current_picture_ptr->long_ref) {
586
av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference "
587
"assignment for second field "
588
"in complementary field pair "
589
"(first field is long term)\n");
591
pic= remove_short(h, s->current_picture_ptr->frame_num, 0);
593
av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
596
if(h->short_ref_count)
597
memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*));
599
h->short_ref[0]= s->current_picture_ptr;
600
h->short_ref_count++;
601
s->current_picture_ptr->reference |= s->picture_structure;
605
if (h->long_ref_count + h->short_ref_count > h->sps.ref_frame_count){
607
/* We have too many reference frames, probably due to corrupted
608
* stream. Need to discard one frame. Prevents overrun of the
609
* short_ref and long_ref buffers.
611
av_log(h->s.avctx, AV_LOG_ERROR,
612
"number of reference frames exceeds max (probably "
613
"corrupt input), discarding one\n");
615
if (h->long_ref_count && !h->short_ref_count) {
616
for (i = 0; i < 16; ++i)
621
remove_long(h, i, 0);
623
pic = h->short_ref[h->short_ref_count - 1];
624
remove_short(h, pic->frame_num, 0);
633
int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb){
634
MpegEncContext * const s = &h->s;
638
if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
639
s->broken_link= get_bits1(gb) -1;
641
h->mmco[0].opcode= MMCO_LONG;
642
h->mmco[0].long_arg= 0;
646
if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag
647
for(i= 0; i<MAX_MMCO_COUNT; i++) {
648
MMCOOpcode opcode= get_ue_golomb_31(gb);
650
h->mmco[i].opcode= opcode;
651
if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){
652
h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1);
653
/* if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){
654
av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco);
658
if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){
659
unsigned int long_arg= get_ue_golomb_31(gb);
660
if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){
661
av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode);
664
h->mmco[i].long_arg= long_arg;
667
if(opcode > (unsigned)MMCO_LONG){
668
av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode);
671
if(opcode == MMCO_END)
676
assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
678
if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
679
!(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) {
680
h->mmco[0].opcode= MMCO_SHORT2UNUSED;
681
h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num;
684
h->mmco[0].short_pic_num *= 2;
685
h->mmco[1].opcode= MMCO_SHORT2UNUSED;
686
h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1;
added
removed
libavcodec/h264_refs.c
