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h264: move the block starting a new field out of slice_header_parse() 

There is no bitstream parsing in that block and messing with
decoder-global state is not something that belongs into header parsing.

Nothing else in this function depends on the value of current_slice,
except for two validity checks. Those checks are also moved out of
slice_header_parse().
This commit is contained in:
Anton Khirnov 2016-05-17 14:51:01 +02:00
parent b25cd7540e
commit 8d36932c8d
1 changed files with 33 additions and 35 deletions
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68
libavcodec/h264_slice.c
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@ -1177,21 +1177,6 @@ static int h264_slice_header_parse(H264Context *h, H264SliceContext *sl,
sl->first_mb_addr = get_ue_golomb(&sl->gb);
if (sl->first_mb_addr == 0) { // FIXME better field boundary detection
if (h->current_slice && h->cur_pic_ptr && FIELD_PICTURE(h)) {
ff_h264_field_end(h, sl, 1);
}
h->current_slice = 0;
if (!h->first_field) {
if (h->cur_pic_ptr && !h->droppable) {
ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
h->picture_structure == PICT_BOTTOM_FIELD);
}
h->cur_pic_ptr = NULL;
}
}
slice_type = get_ue_golomb_31(&sl->gb);
if (slice_type > 9) {
av_log(h->avctx, AV_LOG_ERROR,
@ -1226,11 +1211,6 @@ static int h264_slice_header_parse(H264Context *h, H264SliceContext *sl,
sl->pps_id);
return AVERROR_INVALIDDATA;
}
if (h->current_slice > 0 &&
h->ps.pps != (const PPS*)h->ps.pps_list[sl->pps_id]->data) {
av_log(h->avctx, AV_LOG_ERROR, "PPS changed between slices\n");
return AVERROR_INVALIDDATA;
}
pps = (const PPS*)h->ps.pps_list[sl->pps_id]->data;
if (!h->ps.sps_list[pps->sps_id]) {
@ -1265,21 +1245,6 @@ static int h264_slice_header_parse(H264Context *h, H264SliceContext *sl,
sl->picture_structure = picture_structure;
sl->mb_field_decoding_flag = picture_structure != PICT_FRAME;
if (h->current_slice != 0) {
if (h->picture_structure != picture_structure ||
h->droppable != droppable) {
av_log(h->avctx, AV_LOG_ERROR,
"Changing field mode (%d -> %d) between slices is not allowed\n",
h->picture_structure, picture_structure);
return AVERROR_INVALIDDATA;
} else if (!h->cur_pic_ptr) {
av_log(h->avctx, AV_LOG_ERROR,
"unset cur_pic_ptr on slice %d\n",
h->current_slice + 1);
return AVERROR_INVALIDDATA;
}
}
if (picture_structure == PICT_FRAME) {
h->curr_pic_num = h->poc.frame_num;
h->max_pic_num = 1 << sps->log2_max_frame_num;
@ -1430,10 +1395,43 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl,
if (ret < 0)
return ret;
if (sl->first_mb_addr == 0) { // FIXME better field boundary detection
if (h->current_slice && h->cur_pic_ptr && FIELD_PICTURE(h)) {
ff_h264_field_end(h, sl, 1);
}
h->current_slice = 0;
if (!h->first_field) {
if (h->cur_pic_ptr && !h->droppable) {
ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
h->picture_structure == PICT_BOTTOM_FIELD);
}
h->cur_pic_ptr = NULL;
}
}
if (h->current_slice == 0) {
ret = h264_field_start(h, sl, nal);
if (ret < 0)
return ret;
} else {
if (h->ps.pps != (const PPS*)h->ps.pps_list[sl->pps_id]->data) {
av_log(h->avctx, AV_LOG_ERROR, "PPS changed between slices\n");
return AVERROR_INVALIDDATA;
}
if (h->picture_structure != sl->picture_structure ||
h->droppable != (nal->ref_idc == 0)) {
av_log(h->avctx, AV_LOG_ERROR,
"Changing field mode (%d -> %d) between slices is not allowed\n",
h->picture_structure, sl->picture_structure);
return AVERROR_INVALIDDATA;
} else if (!h->cur_pic_ptr) {
av_log(h->avctx, AV_LOG_ERROR,
"unset cur_pic_ptr on slice %d\n",
h->current_slice + 1);
return AVERROR_INVALIDDATA;
}
}
assert(h->mb_num == h->mb_width * h->mb_height);