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Code Issues Releases Activity

hevc_parser: drop the use of SliceHeader

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It is only used to store a few local variables within one function,
which is better accomplished by just declaring them on stack explicitly.
This commit is contained in:
Anton Khirnov 2020-05-27 11:01:12 +02:00
parent 2a9bed8fc1
commit fb30c9107a
1 changed files with 30 additions and 27 deletions
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57
libavcodec/hevc_parser.c
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@ -42,7 +42,6 @@ typedef struct HEVCParserContext {
H2645Packet pkt;
HEVCParamSets ps;
HEVCSEI sei;
SliceHeader sh;
int is_avc;
int nal_length_size;
@ -58,26 +57,28 @@ static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
HEVCParserContext *ctx = s->priv_data;
HEVCParamSets *ps = &ctx->ps;
HEVCSEI *sei = &ctx->sei;
SliceHeader *sh = &ctx->sh;
GetBitContext *gb = &nal->gb;
const HEVCWindow *ow;
int i, num = 0, den = 0;
sh->first_slice_in_pic_flag = get_bits1(gb);
unsigned int pps_id, first_slice_in_pic_flag, dependent_slice_segment_flag;
enum HEVCSliceType slice_type;
first_slice_in_pic_flag = get_bits1(gb);
s->picture_structure = sei->picture_timing.picture_struct;
s->field_order = sei->picture_timing.picture_struct;
if (IS_IRAP_NAL(nal)) {
s->key_frame = 1;
sh->no_output_of_prior_pics_flag = get_bits1(gb);
skip_bits1(gb); // no_output_of_prior_pics_flag
}
sh->pps_id = get_ue_golomb(gb);
if (sh->pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[sh->pps_id]) {
av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
pps_id = get_ue_golomb(gb);
if (pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[pps_id]) {
av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);
return AVERROR_INVALIDDATA;
}
ps->pps = (HEVCPPS*)ps->pps_list[sh->pps_id]->data;
ps->pps = (HEVCPPS*)ps->pps_list[pps_id]->data;
if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
@ -109,51 +110,53 @@ static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
av_reduce(&avctx->framerate.den, &avctx->framerate.num,
num, den, 1 << 30);
if (!sh->first_slice_in_pic_flag) {
if (!first_slice_in_pic_flag) {
unsigned int slice_segment_addr;
int slice_address_length;
if (ps->pps->dependent_slice_segments_enabled_flag)
sh->dependent_slice_segment_flag = get_bits1(gb);
dependent_slice_segment_flag = get_bits1(gb);
else
sh->dependent_slice_segment_flag = 0;
dependent_slice_segment_flag = 0;
slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
ps->sps->ctb_height);
sh->slice_segment_addr = get_bitsz(gb, slice_address_length);
if (sh->slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
slice_segment_addr = get_bitsz(gb, slice_address_length);
if (slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
sh->slice_segment_addr);
slice_segment_addr);
return AVERROR_INVALIDDATA;
}
} else
sh->dependent_slice_segment_flag = 0;
dependent_slice_segment_flag = 0;
if (sh->dependent_slice_segment_flag)
if (dependent_slice_segment_flag)
return 0; /* break; */
for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
sh->slice_type = get_ue_golomb(gb);
if (!(sh->slice_type == HEVC_SLICE_I || sh->slice_type == HEVC_SLICE_P ||
sh->slice_type == HEVC_SLICE_B)) {
slice_type = get_ue_golomb(gb);
if (!(slice_type == HEVC_SLICE_I || slice_type == HEVC_SLICE_P ||
slice_type == HEVC_SLICE_B)) {
av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
sh->slice_type);
slice_type);
return AVERROR_INVALIDDATA;
}
s->pict_type = sh->slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
sh->slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
AV_PICTURE_TYPE_I;
s->pict_type = slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
AV_PICTURE_TYPE_I;
if (ps->pps->output_flag_present_flag)
sh->pic_output_flag = get_bits1(gb);
skip_bits1(gb); // pic_output_flag
if (ps->sps->separate_colour_plane_flag)
sh->colour_plane_id = get_bits(gb, 2);
skip_bits(gb, 2); // colour_plane_id
if (!IS_IDR_NAL(nal)) {
sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
s->output_picture_number = ctx->poc = ff_hevc_compute_poc(ps->sps, ctx->pocTid0, sh->pic_order_cnt_lsb, nal->type);
int pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
s->output_picture_number = ctx->poc =
ff_hevc_compute_poc(ps->sps, ctx->pocTid0, pic_order_cnt_lsb, nal->type);
} else
s->output_picture_number = ctx->poc = 0;