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https://github.com/FFmpeg/FFmpeg.git
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avcodec/hevc_parser: move slice header parsing to its own function
Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com> Reviewed-by: Aaron Levinson <alevinsn@aracnet.com> Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
parent
1c088632e9
commit
bf1e3be5a3
@ -92,6 +92,122 @@ static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
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return END_NOT_FOUND;
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}
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static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
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AVCodecContext *avctx)
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{
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HEVCParserContext *ctx = s->priv_data;
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HEVCParamSets *ps = &ctx->ps;
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HEVCSEIContext *sei = &ctx->sei;
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SliceHeader *sh = &ctx->sh;
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GetBitContext *gb = &nal->gb;
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int i, num = 0, den = 0;
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sh->first_slice_in_pic_flag = get_bits1(gb);
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s->picture_structure = sei->picture_timing.picture_struct;
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s->field_order = sei->picture_timing.picture_struct;
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if (IS_IRAP_NAL(nal)) {
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s->key_frame = 1;
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sh->no_output_of_prior_pics_flag = get_bits1(gb);
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}
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sh->pps_id = get_ue_golomb(gb);
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if (sh->pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[sh->pps_id]) {
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av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
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return AVERROR_INVALIDDATA;
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}
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ps->pps = (HEVCPPS*)ps->pps_list[sh->pps_id]->data;
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if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
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av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
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return AVERROR_INVALIDDATA;
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}
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if (ps->sps != (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data) {
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ps->sps = (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data;
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ps->vps = (HEVCVPS*)ps->vps_list[ps->sps->vps_id]->data;
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}
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s->coded_width = ps->sps->width;
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s->coded_height = ps->sps->height;
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s->width = ps->sps->output_width;
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s->height = ps->sps->output_height;
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s->format = ps->sps->pix_fmt;
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avctx->profile = ps->sps->ptl.general_ptl.profile_idc;
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avctx->level = ps->sps->ptl.general_ptl.level_idc;
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if (ps->vps->vps_timing_info_present_flag) {
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num = ps->vps->vps_num_units_in_tick;
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den = ps->vps->vps_time_scale;
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} else if (ps->sps->vui.vui_timing_info_present_flag) {
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num = ps->sps->vui.vui_num_units_in_tick;
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den = ps->sps->vui.vui_time_scale;
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}
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if (num != 0 && den != 0)
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av_reduce(&avctx->framerate.den, &avctx->framerate.num,
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num, den, 1 << 30);
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if (!sh->first_slice_in_pic_flag) {
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int slice_address_length;
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if (ps->pps->dependent_slice_segments_enabled_flag)
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sh->dependent_slice_segment_flag = get_bits1(gb);
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else
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sh->dependent_slice_segment_flag = 0;
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slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
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ps->sps->ctb_height);
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sh->slice_segment_addr = get_bitsz(gb, slice_address_length);
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if (sh->slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
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av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
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sh->slice_segment_addr);
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return AVERROR_INVALIDDATA;
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}
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} else
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sh->dependent_slice_segment_flag = 0;
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if (sh->dependent_slice_segment_flag)
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return 0; /* break; */
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for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
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skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
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sh->slice_type = get_ue_golomb(gb);
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if (!(sh->slice_type == HEVC_SLICE_I || sh->slice_type == HEVC_SLICE_P ||
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sh->slice_type == HEVC_SLICE_B)) {
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av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
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sh->slice_type);
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return AVERROR_INVALIDDATA;
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}
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s->pict_type = sh->slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
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sh->slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
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AV_PICTURE_TYPE_I;
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if (ps->pps->output_flag_present_flag)
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sh->pic_output_flag = get_bits1(gb);
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if (ps->sps->separate_colour_plane_flag)
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sh->colour_plane_id = get_bits(gb, 2);
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if (!IS_IDR_NAL(nal)) {
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sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
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s->output_picture_number = ctx->poc = ff_hevc_compute_poc(ps->sps, ctx->pocTid0, sh->pic_order_cnt_lsb, nal->type);
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} else
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s->output_picture_number = ctx->poc = 0;
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if (nal->temporal_id == 0 &&
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nal->type != HEVC_NAL_TRAIL_N &&
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nal->type != HEVC_NAL_TSA_N &&
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nal->type != HEVC_NAL_STSA_N &&
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nal->type != HEVC_NAL_RADL_N &&
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nal->type != HEVC_NAL_RASL_N &&
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nal->type != HEVC_NAL_RADL_R &&
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nal->type != HEVC_NAL_RASL_R)
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ctx->pocTid0 = ctx->poc;
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return 1; /* no need to evaluate the rest */
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}
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/**
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* Parse NAL units of found picture and decode some basic information.
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*
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@ -104,7 +220,6 @@ static inline int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
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int buf_size, AVCodecContext *avctx)
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{
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HEVCParserContext *ctx = s->priv_data;
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SliceHeader *sh = &ctx->sh;
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HEVCParamSets *ps = &ctx->ps;
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HEVCSEIContext *sei = &ctx->sei;
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int is_global = buf == avctx->extradata;
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@ -125,8 +240,6 @@ static inline int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
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for (i = 0; i < ctx->pkt.nb_nals; i++) {
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H2645NAL *nal = &ctx->pkt.nals[i];
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GetBitContext *gb = &nal->gb;
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int num = 0, den = 0;
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switch (nal->type) {
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case HEVC_NAL_VPS:
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@ -164,110 +277,10 @@ static inline int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
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return AVERROR_INVALIDDATA;
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}
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sh->first_slice_in_pic_flag = get_bits1(gb);
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s->picture_structure = sei->picture_timing.picture_struct;
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s->field_order = sei->picture_timing.picture_struct;
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if (IS_IRAP_NAL(nal)) {
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s->key_frame = 1;
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sh->no_output_of_prior_pics_flag = get_bits1(gb);
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}
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sh->pps_id = get_ue_golomb(gb);
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if (sh->pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[sh->pps_id]) {
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av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
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return AVERROR_INVALIDDATA;
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}
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ps->pps = (HEVCPPS*)ps->pps_list[sh->pps_id]->data;
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if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
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av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
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return AVERROR_INVALIDDATA;
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}
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if (ps->sps != (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data) {
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ps->sps = (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data;
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ps->vps = (HEVCVPS*)ps->vps_list[ps->sps->vps_id]->data;
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}
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s->coded_width = ps->sps->width;
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s->coded_height = ps->sps->height;
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s->width = ps->sps->output_width;
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s->height = ps->sps->output_height;
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s->format = ps->sps->pix_fmt;
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avctx->profile = ps->sps->ptl.general_ptl.profile_idc;
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avctx->level = ps->sps->ptl.general_ptl.level_idc;
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if (ps->vps->vps_timing_info_present_flag) {
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num = ps->vps->vps_num_units_in_tick;
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den = ps->vps->vps_time_scale;
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} else if (ps->sps->vui.vui_timing_info_present_flag) {
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num = ps->sps->vui.vui_num_units_in_tick;
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den = ps->sps->vui.vui_time_scale;
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}
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if (num != 0 && den != 0)
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av_reduce(&avctx->framerate.den, &avctx->framerate.num,
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num, den, 1 << 30);
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if (!sh->first_slice_in_pic_flag) {
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int slice_address_length;
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if (ps->pps->dependent_slice_segments_enabled_flag)
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sh->dependent_slice_segment_flag = get_bits1(gb);
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else
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sh->dependent_slice_segment_flag = 0;
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slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
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ps->sps->ctb_height);
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sh->slice_segment_addr = get_bitsz(gb, slice_address_length);
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if (sh->slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
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av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
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sh->slice_segment_addr);
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return AVERROR_INVALIDDATA;
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}
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} else
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sh->dependent_slice_segment_flag = 0;
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if (sh->dependent_slice_segment_flag)
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break;
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for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
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skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
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sh->slice_type = get_ue_golomb(gb);
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if (!(sh->slice_type == HEVC_SLICE_I || sh->slice_type == HEVC_SLICE_P ||
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sh->slice_type == HEVC_SLICE_B)) {
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av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
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sh->slice_type);
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return AVERROR_INVALIDDATA;
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}
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s->pict_type = sh->slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
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sh->slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
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AV_PICTURE_TYPE_I;
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if (ps->pps->output_flag_present_flag)
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sh->pic_output_flag = get_bits1(gb);
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if (ps->sps->separate_colour_plane_flag)
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sh->colour_plane_id = get_bits(gb, 2);
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if (!IS_IDR_NAL(nal)) {
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sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
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s->output_picture_number = ctx->poc = ff_hevc_compute_poc(ps->sps, ctx->pocTid0, sh->pic_order_cnt_lsb, nal->type);
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} else
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s->output_picture_number = ctx->poc = 0;
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if (nal->temporal_id == 0 &&
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nal->type != HEVC_NAL_TRAIL_N &&
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nal->type != HEVC_NAL_TSA_N &&
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nal->type != HEVC_NAL_STSA_N &&
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nal->type != HEVC_NAL_RADL_N &&
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nal->type != HEVC_NAL_RASL_N &&
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nal->type != HEVC_NAL_RADL_R &&
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nal->type != HEVC_NAL_RASL_R)
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ctx->pocTid0 = ctx->poc;
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return 0; /* no need to evaluate the rest */
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ret = hevc_parse_slice_header(s, nal, avctx);
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if (ret)
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return ret;
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break;
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}
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}
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/* didn't find a picture! */
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