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h264: store {curr,max}_pic_num in the per-slice context

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While the value of those variables will be constant for the whole frame,
they are only used in two functions called from slice header decoding.
Moving them to the per-slice context allows us to make the H264Context
passed to slice_header_parse() constant.
This commit is contained in:
Anton Khirnov 2016-05-17 16:45:15 +02:00
parent f966498e43
commit debca90863
3 changed files with 12 additions and 23 deletions
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12
libavcodec/h264.h
View File

@ -451,6 +451,8 @@ typedef struct H264SliceContext {
int poc_lsb;
int delta_poc_bottom;
int delta_poc[2];
int curr_pic_num;
int max_pic_num;
} H264SliceContext;
/**
@ -565,16 +567,6 @@ typedef struct H264Context {
H264POCContext poc;
/**
* frame_num for frames or 2 * frame_num + 1 for field pics.
*/
int curr_pic_num;
/**
* max_frame_num or 2 * max_frame_num for field pics.
*/
int max_pic_num;
H264Picture *short_ref[32];
H264Picture *long_ref[32];
H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?

10
libavcodec/h264_refs.c
View File

@ -262,7 +262,7 @@ int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl)
h264_initialise_ref_list(h, sl);
for (list = 0; list < sl->list_count; list++) {
int pred = h->curr_pic_num;
int pred = sl->curr_pic_num;
for (index = 0; index < sl->nb_ref_modifications[list]; index++) {
unsigned int modification_of_pic_nums_idc = sl->ref_modifications[list][index].op;
@ -277,7 +277,7 @@ int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl)
const unsigned int abs_diff_pic_num = val + 1;
int frame_num;
if (abs_diff_pic_num > h->max_pic_num) {
if (abs_diff_pic_num > sl->max_pic_num) {
av_log(h->avctx, AV_LOG_ERROR,
"abs_diff_pic_num overflow\n");
return AVERROR_INVALIDDATA;
@ -287,7 +287,7 @@ int ff_h264_build_ref_list(const H264Context *h, H264SliceContext *sl)
pred -= abs_diff_pic_num;
else
pred += abs_diff_pic_num;
pred &= h->max_pic_num - 1;
pred &= sl->max_pic_num - 1;
frame_num = pic_num_extract(h, pred, &pic_structure);
@ -751,8 +751,8 @@ int ff_h264_decode_ref_pic_marking(const H264Context *h, H264SliceContext *sl,
mmco[i].opcode = opcode;
if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) {
mmco[i].short_pic_num =
(h->curr_pic_num - get_ue_golomb(gb) - 1) &
(h->max_pic_num - 1);
(sl->curr_pic_num - get_ue_golomb(gb) - 1) &
(sl->max_pic_num - 1);
#if 0
if (mmco[i].short_pic_num >= h->short_ref_count ||
!h->short_ref[mmco[i].short_pic_num]) {

13
libavcodec/h264_slice.c
View File

@ -405,9 +405,6 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
memcpy(&h->poc, &h1->poc, sizeof(h->poc));
h->curr_pic_num = h1->curr_pic_num;
h->max_pic_num = h1->max_pic_num;
memcpy(h->short_ref, h1->short_ref, sizeof(h->short_ref));
memcpy(h->long_ref, h1->long_ref, sizeof(h->long_ref));
memcpy(h->delayed_pic, h1->delayed_pic, sizeof(h->delayed_pic));
@ -1173,7 +1170,7 @@ static int h264_field_start(H264Context *h, const H264SliceContext *sl,
return 0;
}
static int h264_slice_header_parse(H264Context *h, H264SliceContext *sl,
static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
const H2645NAL *nal)
{
const SPS *sps;
@ -1248,11 +1245,11 @@ static int h264_slice_header_parse(H264Context *h, H264SliceContext *sl,
sl->mb_field_decoding_flag = picture_structure != PICT_FRAME;
if (picture_structure == PICT_FRAME) {
h->curr_pic_num = sl->frame_num;
h->max_pic_num = 1 << sps->log2_max_frame_num;
sl->curr_pic_num = sl->frame_num;
sl->max_pic_num = 1 << sps->log2_max_frame_num;
} else {
h->curr_pic_num = 2 * sl->frame_num + 1;
h->max_pic_num = 1 << (sps->log2_max_frame_num + 1);
sl->curr_pic_num = 2 * sl->frame_num + 1;
sl->max_pic_num = 1 << (sps->log2_max_frame_num + 1);
}
if (nal->type == NAL_IDR_SLICE)