mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 21172 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Michael Niedermayer
15 years ago
parent
099809d19b
commit
ea6f00c448
4 changed files with 733 additions and 682 deletions
@ -0,0 +1,700 @@ |
||||
/*
|
||||
* H.26L/H.264/AVC/JVT/14496-10/... reference picture handling |
||||
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
||||
* |
||||
* This file is part of FFmpeg. |
||||
* |
||||
* FFmpeg is free software; you can redistribute it and/or |
||||
* modify it under the terms of the GNU Lesser General Public |
||||
* License as published by the Free Software Foundation; either |
||||
* version 2.1 of the License, or (at your option) any later version. |
||||
* |
||||
* FFmpeg is distributed in the hope that it will be useful, |
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||||
* Lesser General Public License for more details. |
||||
* |
||||
* You should have received a copy of the GNU Lesser General Public |
||||
* License along with FFmpeg; if not, write to the Free Software |
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||
*/ |
||||
|
||||
/**
|
||||
* @file libavcodec/h264_refs.c |
||||
* H.264 / AVC / MPEG4 part10 reference picture handling. |
||||
* @author Michael Niedermayer <michaelni@gmx.at> |
||||
*/ |
||||
|
||||
#include "internal.h" |
||||
#include "dsputil.h" |
||||
#include "avcodec.h" |
||||
#include "h264.h" |
||||
#include "golomb.h" |
||||
|
||||
//#undef NDEBUG
|
||||
#include <assert.h> |
||||
|
||||
|
||||
static void pic_as_field(Picture *pic, const int parity){ |
||||
int i; |
||||
for (i = 0; i < 4; ++i) { |
||||
if (parity == PICT_BOTTOM_FIELD) |
||||
pic->data[i] += pic->linesize[i]; |
||||
pic->reference = parity; |
||||
pic->linesize[i] *= 2; |
||||
} |
||||
pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD]; |
||||
} |
||||
|
||||
static int split_field_copy(Picture *dest, Picture *src, |
||||
int parity, int id_add){ |
||||
int match = !!(src->reference & parity); |
||||
|
||||
if (match) { |
||||
*dest = *src; |
||||
if(parity != PICT_FRAME){ |
||||
pic_as_field(dest, parity); |
||||
dest->pic_id *= 2; |
||||
dest->pic_id += id_add; |
||||
} |
||||
} |
||||
|
||||
return match; |
||||
} |
||||
|
||||
static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){ |
||||
int i[2]={0}; |
||||
int index=0; |
||||
|
||||
while(i[0]<len || i[1]<len){ |
||||
while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel))) |
||||
i[0]++; |
||||
while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3)))) |
||||
i[1]++; |
||||
if(i[0] < len){ |
||||
in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num; |
||||
split_field_copy(&def[index++], in[ i[0]++ ], sel , 1); |
||||
} |
||||
if(i[1] < len){ |
||||
in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num; |
||||
split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0); |
||||
} |
||||
} |
||||
|
||||
return index; |
||||
} |
||||
|
||||
static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){ |
||||
int i, best_poc; |
||||
int out_i= 0; |
||||
|
||||
for(;;){ |
||||
best_poc= dir ? INT_MIN : INT_MAX; |
||||
|
||||
for(i=0; i<len; i++){ |
||||
const int poc= src[i]->poc; |
||||
if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){ |
||||
best_poc= poc; |
||||
sorted[out_i]= src[i]; |
||||
} |
||||
} |
||||
if(best_poc == (dir ? INT_MIN : INT_MAX)) |
||||
break; |
||||
limit= sorted[out_i++]->poc - dir; |
||||
} |
||||
return out_i; |
||||
} |
||||
|
||||
int ff_h264_fill_default_ref_list(H264Context *h){ |
||||
MpegEncContext * const s = &h->s; |
||||
int i, len; |
||||
|
||||
if(h->slice_type_nos==FF_B_TYPE){ |
||||
Picture *sorted[32]; |
||||
int cur_poc, list; |
||||
int lens[2]; |
||||
|
||||
if(FIELD_PICTURE) |
||||
cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ]; |
||||
else |
||||
cur_poc= s->current_picture_ptr->poc; |
||||
|
||||
for(list= 0; list<2; list++){ |
||||
len= add_sorted(sorted , h->short_ref, h->short_ref_count, cur_poc, 1^list); |
||||
len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list); |
||||
assert(len<=32); |
||||
len= build_def_list(h->default_ref_list[list] , sorted , len, 0, s->picture_structure); |
||||
len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure); |
||||
assert(len<=32); |
||||
|
||||
if(len < h->ref_count[list]) |
||||
memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len)); |
||||
lens[list]= len; |
||||
} |
||||
|
||||
if(lens[0] == lens[1] && lens[1] > 1){ |
||||
for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++); |
||||
if(i == lens[0]) |
||||
FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]); |
||||
} |
||||
}else{ |
||||
len = build_def_list(h->default_ref_list[0] , h->short_ref, h->short_ref_count, 0, s->picture_structure); |
||||
len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16 , 1, s->picture_structure); |
||||
assert(len <= 32); |
||||
if(len < h->ref_count[0]) |
||||
memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len)); |
||||
} |
||||
#ifdef TRACE |
||||
for (i=0; i<h->ref_count[0]; i++) { |
||||
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]); |
||||
} |
||||
if(h->slice_type_nos==FF_B_TYPE){ |
||||
for (i=0; i<h->ref_count[1]; i++) { |
||||
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]); |
||||
} |
||||
} |
||||
#endif |
||||
return 0; |
||||
} |
||||
|
||||
static void print_short_term(H264Context *h); |
||||
static void print_long_term(H264Context *h); |
||||
|
||||
/**
|
||||
* Extract structure information about the picture described by pic_num in |
||||
* the current decoding context (frame or field). Note that pic_num is |
||||
* picture number without wrapping (so, 0<=pic_num<max_pic_num). |
||||
* @param pic_num picture number for which to extract structure information |
||||
* @param structure one of PICT_XXX describing structure of picture |
||||
* with pic_num |
||||
* @return frame number (short term) or long term index of picture |
||||
* described by pic_num |
||||
*/ |
||||
static int pic_num_extract(H264Context *h, int pic_num, int *structure){ |
||||
MpegEncContext * const s = &h->s; |
||||
|
||||
*structure = s->picture_structure; |
||||
if(FIELD_PICTURE){ |
||||
if (!(pic_num & 1)) |
||||
/* opposite field */ |
||||
*structure ^= PICT_FRAME; |
||||
pic_num >>= 1; |
||||
} |
||||
|
||||
return pic_num; |
||||
} |
||||
|
||||
int ff_h264_decode_ref_pic_list_reordering(H264Context *h){ |
||||
MpegEncContext * const s = &h->s; |
||||
int list, index, pic_structure; |
||||
|
||||
print_short_term(h); |
||||
print_long_term(h); |
||||
|
||||
for(list=0; list<h->list_count; list++){ |
||||
memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]); |
||||
|
||||
if(get_bits1(&s->gb)){ |
||||
int pred= h->curr_pic_num; |
||||
|
||||
for(index=0; ; index++){ |
||||
unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb); |
||||
unsigned int pic_id; |
||||
int i; |
||||
Picture *ref = NULL; |
||||
|
||||
if(reordering_of_pic_nums_idc==3) |
||||
break; |
||||
|
||||
if(index >= h->ref_count[list]){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n"); |
||||
return -1; |
||||
} |
||||
|
||||
if(reordering_of_pic_nums_idc<3){ |
||||
if(reordering_of_pic_nums_idc<2){ |
||||
const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1; |
||||
int frame_num; |
||||
|
||||
if(abs_diff_pic_num > h->max_pic_num){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n"); |
||||
return -1; |
||||
} |
||||
|
||||
if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num; |
||||
else pred+= abs_diff_pic_num; |
||||
pred &= h->max_pic_num - 1; |
||||
|
||||
frame_num = pic_num_extract(h, pred, &pic_structure); |
||||
|
||||
for(i= h->short_ref_count-1; i>=0; i--){ |
||||
ref = h->short_ref[i]; |
||||
assert(ref->reference); |
||||
assert(!ref->long_ref); |
||||
if( |
||||
ref->frame_num == frame_num && |
||||
(ref->reference & pic_structure) |
||||
) |
||||
break; |
||||
} |
||||
if(i>=0) |
||||
ref->pic_id= pred; |
||||
}else{ |
||||
int long_idx; |
||||
pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx
|
||||
|
||||
long_idx= pic_num_extract(h, pic_id, &pic_structure); |
||||
|
||||
if(long_idx>31){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n"); |
||||
return -1; |
||||
} |
||||
ref = h->long_ref[long_idx]; |
||||
assert(!(ref && !ref->reference)); |
||||
if(ref && (ref->reference & pic_structure)){ |
||||
ref->pic_id= pic_id; |
||||
assert(ref->long_ref); |
||||
i=0; |
||||
}else{ |
||||
i=-1; |
||||
} |
||||
} |
||||
|
||||
if (i < 0) { |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n"); |
||||
memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME
|
||||
} else { |
||||
for(i=index; i+1<h->ref_count[list]; i++){ |
||||
if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id) |
||||
break; |
||||
} |
||||
for(; i > index; i--){ |
||||
h->ref_list[list][i]= h->ref_list[list][i-1]; |
||||
} |
||||
h->ref_list[list][index]= *ref; |
||||
if (FIELD_PICTURE){ |
||||
pic_as_field(&h->ref_list[list][index], pic_structure); |
||||
} |
||||
} |
||||
}else{ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n"); |
||||
return -1; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
for(list=0; list<h->list_count; list++){ |
||||
for(index= 0; index < h->ref_count[list]; index++){ |
||||
if(!h->ref_list[list][index].data[0]){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n"); |
||||
if(h->default_ref_list[list][0].data[0]) |
||||
h->ref_list[list][index]= h->default_ref_list[list][0]; |
||||
else |
||||
return -1; |
||||
} |
||||
} |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
void ff_h264_fill_mbaff_ref_list(H264Context *h){ |
||||
int list, i, j; |
||||
for(list=0; list<2; list++){ //FIXME try list_count
|
||||
for(i=0; i<h->ref_count[list]; i++){ |
||||
Picture *frame = &h->ref_list[list][i]; |
||||
Picture *field = &h->ref_list[list][16+2*i]; |
||||
field[0] = *frame; |
||||
for(j=0; j<3; j++) |
||||
field[0].linesize[j] <<= 1; |
||||
field[0].reference = PICT_TOP_FIELD; |
||||
field[0].poc= field[0].field_poc[0]; |
||||
field[1] = field[0]; |
||||
for(j=0; j<3; j++) |
||||
field[1].data[j] += frame->linesize[j]; |
||||
field[1].reference = PICT_BOTTOM_FIELD; |
||||
field[1].poc= field[1].field_poc[1]; |
||||
|
||||
h->luma_weight[list][16+2*i] = h->luma_weight[list][16+2*i+1] = h->luma_weight[list][i]; |
||||
h->luma_offset[list][16+2*i] = h->luma_offset[list][16+2*i+1] = h->luma_offset[list][i]; |
||||
for(j=0; j<2; j++){ |
||||
h->chroma_weight[list][16+2*i][j] = h->chroma_weight[list][16+2*i+1][j] = h->chroma_weight[list][i][j]; |
||||
h->chroma_offset[list][16+2*i][j] = h->chroma_offset[list][16+2*i+1][j] = h->chroma_offset[list][i][j]; |
||||
} |
||||
} |
||||
} |
||||
for(j=0; j<h->ref_count[1]; j++){ |
||||
for(i=0; i<h->ref_count[0]; i++) |
||||
h->implicit_weight[j][16+2*i] = h->implicit_weight[j][16+2*i+1] = h->implicit_weight[j][i]; |
||||
memcpy(h->implicit_weight[16+2*j], h->implicit_weight[j], sizeof(*h->implicit_weight)); |
||||
memcpy(h->implicit_weight[16+2*j+1], h->implicit_weight[j], sizeof(*h->implicit_weight)); |
||||
} |
||||
} |
||||
|
||||
/**
|
||||
* Mark a picture as no longer needed for reference. The refmask |
||||
* argument allows unreferencing of individual fields or the whole frame. |
||||
* If the picture becomes entirely unreferenced, but is being held for |
||||
* display purposes, it is marked as such. |
||||
* @param refmask mask of fields to unreference; the mask is bitwise |
||||
* anded with the reference marking of pic |
||||
* @return non-zero if pic becomes entirely unreferenced (except possibly |
||||
* for display purposes) zero if one of the fields remains in |
||||
* reference |
||||
*/ |
||||
static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){ |
||||
int i; |
||||
if (pic->reference &= refmask) { |
||||
return 0; |
||||
} else { |
||||
for(i = 0; h->delayed_pic[i]; i++) |
||||
if(pic == h->delayed_pic[i]){ |
||||
pic->reference=DELAYED_PIC_REF; |
||||
break; |
||||
} |
||||
return 1; |
||||
} |
||||
} |
||||
|
||||
/**
|
||||
* Find a Picture in the short term reference list by frame number. |
||||
* @param frame_num frame number to search for |
||||
* @param idx the index into h->short_ref where returned picture is found |
||||
* undefined if no picture found. |
||||
* @return pointer to the found picture, or NULL if no pic with the provided |
||||
* frame number is found |
||||
*/ |
||||
static Picture * find_short(H264Context *h, int frame_num, int *idx){ |
||||
MpegEncContext * const s = &h->s; |
||||
int i; |
||||
|
||||
for(i=0; i<h->short_ref_count; i++){ |
||||
Picture *pic= h->short_ref[i]; |
||||
if(s->avctx->debug&FF_DEBUG_MMCO) |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic); |
||||
if(pic->frame_num == frame_num) { |
||||
*idx = i; |
||||
return pic; |
||||
} |
||||
} |
||||
return NULL; |
||||
} |
||||
|
||||
/**
|
||||
* Remove a picture from the short term reference list by its index in |
||||
* that list. This does no checking on the provided index; it is assumed |
||||
* to be valid. Other list entries are shifted down. |
||||
* @param i index into h->short_ref of picture to remove. |
||||
*/ |
||||
static void remove_short_at_index(H264Context *h, int i){ |
||||
assert(i >= 0 && i < h->short_ref_count); |
||||
h->short_ref[i]= NULL; |
||||
if (--h->short_ref_count) |
||||
memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*)); |
||||
} |
||||
|
||||
/**
|
||||
* |
||||
* @return the removed picture or NULL if an error occurs |
||||
*/ |
||||
static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){ |
||||
MpegEncContext * const s = &h->s; |
||||
Picture *pic; |
||||
int i; |
||||
|
||||
if(s->avctx->debug&FF_DEBUG_MMCO) |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count); |
||||
|
||||
pic = find_short(h, frame_num, &i); |
||||
if (pic){ |
||||
if(unreference_pic(h, pic, ref_mask)) |
||||
remove_short_at_index(h, i); |
||||
} |
||||
|
||||
return pic; |
||||
} |
||||
|
||||
/**
|
||||
* Remove a picture from the long term reference list by its index in |
||||
* that list. |
||||
* @return the removed picture or NULL if an error occurs |
||||
*/ |
||||
static Picture * remove_long(H264Context *h, int i, int ref_mask){ |
||||
Picture *pic; |
||||
|
||||
pic= h->long_ref[i]; |
||||
if (pic){ |
||||
if(unreference_pic(h, pic, ref_mask)){ |
||||
assert(h->long_ref[i]->long_ref == 1); |
||||
h->long_ref[i]->long_ref= 0; |
||||
h->long_ref[i]= NULL; |
||||
h->long_ref_count--; |
||||
} |
||||
} |
||||
|
||||
return pic; |
||||
} |
||||
|
||||
void ff_h264_remove_all_refs(H264Context *h){ |
||||
int i; |
||||
|
||||
for(i=0; i<16; i++){ |
||||
remove_long(h, i, 0); |
||||
} |
||||
assert(h->long_ref_count==0); |
||||
|
||||
for(i=0; i<h->short_ref_count; i++){ |
||||
unreference_pic(h, h->short_ref[i], 0); |
||||
h->short_ref[i]= NULL; |
||||
} |
||||
h->short_ref_count=0; |
||||
} |
||||
|
||||
/**
|
||||
* print short term list |
||||
*/ |
||||
static void print_short_term(H264Context *h) { |
||||
uint32_t i; |
||||
if(h->s.avctx->debug&FF_DEBUG_MMCO) { |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "short term list:\n"); |
||||
for(i=0; i<h->short_ref_count; i++){ |
||||
Picture *pic= h->short_ref[i]; |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]); |
||||
} |
||||
} |
||||
} |
||||
|
||||
/**
|
||||
* print long term list |
||||
*/ |
||||
static void print_long_term(H264Context *h) { |
||||
uint32_t i; |
||||
if(h->s.avctx->debug&FF_DEBUG_MMCO) { |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "long term list:\n"); |
||||
for(i = 0; i < 16; i++){ |
||||
Picture *pic= h->long_ref[i]; |
||||
if (pic) { |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]); |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){ |
||||
MpegEncContext * const s = &h->s; |
||||
int i, av_uninit(j); |
||||
int current_ref_assigned=0; |
||||
Picture *av_uninit(pic); |
||||
|
||||
if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0) |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n"); |
||||
|
||||
for(i=0; i<mmco_count; i++){ |
||||
int av_uninit(structure), av_uninit(frame_num); |
||||
if(s->avctx->debug&FF_DEBUG_MMCO) |
||||
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); |
||||
|
||||
if( mmco[i].opcode == MMCO_SHORT2UNUSED |
||||
|| mmco[i].opcode == MMCO_SHORT2LONG){ |
||||
frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure); |
||||
pic = find_short(h, frame_num, &j); |
||||
if(!pic){ |
||||
if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg] |
||||
|| h->long_ref[mmco[i].long_arg]->frame_num != frame_num) |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n"); |
||||
continue; |
||||
} |
||||
} |
||||
|
||||
switch(mmco[i].opcode){ |
||||
case MMCO_SHORT2UNUSED: |
||||
if(s->avctx->debug&FF_DEBUG_MMCO) |
||||
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); |
||||
remove_short(h, frame_num, structure ^ PICT_FRAME); |
||||
break; |
||||
case MMCO_SHORT2LONG: |
||||
if (h->long_ref[mmco[i].long_arg] != pic) |
||||
remove_long(h, mmco[i].long_arg, 0); |
||||
|
||||
remove_short_at_index(h, j); |
||||
h->long_ref[ mmco[i].long_arg ]= pic; |
||||
if (h->long_ref[ mmco[i].long_arg ]){ |
||||
h->long_ref[ mmco[i].long_arg ]->long_ref=1; |
||||
h->long_ref_count++; |
||||
} |
||||
break; |
||||
case MMCO_LONG2UNUSED: |
||||
j = pic_num_extract(h, mmco[i].long_arg, &structure); |
||||
pic = h->long_ref[j]; |
||||
if (pic) { |
||||
remove_long(h, j, structure ^ PICT_FRAME); |
||||
} else if(s->avctx->debug&FF_DEBUG_MMCO) |
||||
av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n"); |
||||
break; |
||||
case MMCO_LONG: |
||||
// Comment below left from previous code as it is an interresting note.
|
||||
/* First field in pair is in short term list or
|
||||
* at a different long term index. |
||||
* This is not allowed; see 7.4.3.3, notes 2 and 3. |
||||
* Report the problem and keep the pair where it is, |
||||
* and mark this field valid. |
||||
*/ |
||||
|
||||
if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) { |
||||
remove_long(h, mmco[i].long_arg, 0); |
||||
|
||||
h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr; |
||||
h->long_ref[ mmco[i].long_arg ]->long_ref=1; |
||||
h->long_ref_count++; |
||||
} |
||||
|
||||
s->current_picture_ptr->reference |= s->picture_structure; |
||||
current_ref_assigned=1; |
||||
break; |
||||
case MMCO_SET_MAX_LONG: |
||||
assert(mmco[i].long_arg <= 16); |
||||
// just remove the long term which index is greater than new max
|
||||
for(j = mmco[i].long_arg; j<16; j++){ |
||||
remove_long(h, j, 0); |
||||
} |
||||
break; |
||||
case MMCO_RESET: |
||||
while(h->short_ref_count){ |
||||
remove_short(h, h->short_ref[0]->frame_num, 0); |
||||
} |
||||
for(j = 0; j < 16; j++) { |
||||
remove_long(h, j, 0); |
||||
} |
||||
s->current_picture_ptr->poc= |
||||
s->current_picture_ptr->field_poc[0]= |
||||
s->current_picture_ptr->field_poc[1]= |
||||
h->poc_lsb= |
||||
h->poc_msb= |
||||
h->frame_num= |
||||
s->current_picture_ptr->frame_num= 0; |
||||
s->current_picture_ptr->mmco_reset=1; |
||||
break; |
||||
default: assert(0); |
||||
} |
||||
} |
||||
|
||||
if (!current_ref_assigned) { |
||||
/* Second field of complementary field pair; the first field of
|
||||
* which is already referenced. If short referenced, it |
||||
* should be first entry in short_ref. If not, it must exist |
||||
* in long_ref; trying to put it on the short list here is an |
||||
* error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3). |
||||
*/ |
||||
if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) { |
||||
/* Just mark the second field valid */ |
||||
s->current_picture_ptr->reference = PICT_FRAME; |
||||
} else if (s->current_picture_ptr->long_ref) { |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference " |
||||
"assignment for second field " |
||||
"in complementary field pair " |
||||
"(first field is long term)\n"); |
||||
} else { |
||||
pic= remove_short(h, s->current_picture_ptr->frame_num, 0); |
||||
if(pic){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n"); |
||||
} |
||||
|
||||
if(h->short_ref_count) |
||||
memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*)); |
||||
|
||||
h->short_ref[0]= s->current_picture_ptr; |
||||
h->short_ref_count++; |
||||
s->current_picture_ptr->reference |= s->picture_structure; |
||||
} |
||||
} |
||||
|
||||
if (h->long_ref_count + h->short_ref_count > h->sps.ref_frame_count){ |
||||
|
||||
/* We have too many reference frames, probably due to corrupted
|
||||
* stream. Need to discard one frame. Prevents overrun of the |
||||
* short_ref and long_ref buffers. |
||||
*/ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, |
||||
"number of reference frames exceeds max (probably " |
||||
"corrupt input), discarding one\n"); |
||||
|
||||
if (h->long_ref_count && !h->short_ref_count) { |
||||
for (i = 0; i < 16; ++i) |
||||
if (h->long_ref[i]) |
||||
break; |
||||
|
||||
assert(i < 16); |
||||
remove_long(h, i, 0); |
||||
} else { |
||||
pic = h->short_ref[h->short_ref_count - 1]; |
||||
remove_short(h, pic->frame_num, 0); |
||||
} |
||||
} |
||||
|
||||
print_short_term(h); |
||||
print_long_term(h); |
||||
return 0; |
||||
} |
||||
|
||||
int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb){ |
||||
MpegEncContext * const s = &h->s; |
||||
int i; |
||||
|
||||
h->mmco_index= 0; |
||||
if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields
|
||||
s->broken_link= get_bits1(gb) -1; |
||||
if(get_bits1(gb)){ |
||||
h->mmco[0].opcode= MMCO_LONG; |
||||
h->mmco[0].long_arg= 0; |
||||
h->mmco_index= 1; |
||||
} |
||||
}else{ |
||||
if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag
|
||||
for(i= 0; i<MAX_MMCO_COUNT; i++) { |
||||
MMCOOpcode opcode= get_ue_golomb_31(gb); |
||||
|
||||
h->mmco[i].opcode= opcode; |
||||
if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){ |
||||
h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1); |
||||
/* if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco); |
||||
return -1; |
||||
}*/ |
||||
} |
||||
if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){ |
||||
unsigned int long_arg= get_ue_golomb_31(gb); |
||||
if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode); |
||||
return -1; |
||||
} |
||||
h->mmco[i].long_arg= long_arg; |
||||
} |
||||
|
||||
if(opcode > (unsigned)MMCO_LONG){ |
||||
av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode); |
||||
return -1; |
||||
} |
||||
if(opcode == MMCO_END) |
||||
break; |
||||
} |
||||
h->mmco_index= i; |
||||
}else{ |
||||
assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count); |
||||
|
||||
if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count && |
||||
!(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) { |
||||
h->mmco[0].opcode= MMCO_SHORT2UNUSED; |
||||
h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num; |
||||
h->mmco_index= 1; |
||||
if (FIELD_PICTURE) { |
||||
h->mmco[0].short_pic_num *= 2; |
||||
h->mmco[1].opcode= MMCO_SHORT2UNUSED; |
||||
h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1; |
||||
h->mmco_index= 2; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
return 0; |
||||
} |
||||
Loading…
Reference in new issue