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package mpeg
// https://www.itu.int/rec/T-REC-H.265
import (
"github.com/wader/fq/format"
"github.com/wader/fq/pkg/decode"
"github.com/wader/fq/pkg/interp"
)
func init() {
interp.RegisterFormat(
format.HEVC_PPS,
&decode.Format{
Description: "H.265/HEVC Picture Parameter Set",
DecodeFn: hevcPPSDecode,
})
}
// H.265 page 36
func hevcPPSDecode(d *decode.D) any {
d.FieldUintFn("pps_pic_parameter_set_id", uEV)
d.FieldUintFn("pps_seq_parameter_set_id", uEV)
d.FieldBool("dependent_slice_segments_enabled_flag")
d.FieldBool("output_flag_present_flag")
d.FieldU3("num_extra_slice_header_bits")
d.FieldBool("sign_data_hiding_enabled_flag")
d.FieldBool("cabac_init_present_flag")
d.FieldUintFn("num_ref_idx_l0_default_active_minus1", uEV)
d.FieldUintFn("num_ref_idx_l1_default_active_minus1", uEV)
d.FieldSintFn("init_qp_minus26", sEV)
d.FieldBool("constrained_intra_pred_flag")
d.FieldBool("transform_skip_enabled_flag")
cuQpDeltaEnabledFlag := d.FieldBool("cu_qp_delta_enabled_flag")
if cuQpDeltaEnabledFlag {
d.FieldUintFn("diff_cu_qp_delta_depth", uEV)
}
d.FieldSintFn("pps_cb_qp_offset", sEV)
d.FieldSintFn("pps_cr_qp_offset", sEV)
d.FieldBool("pps_slice_chroma_qp_offsets_present_flag")
d.FieldBool("weighted_pred_flag")
d.FieldBool("weighted_bipred_flag")
d.FieldBool("transquant_bypass_enabled_flag")
tilesEnabledFlag := d.FieldBool("tiles_enabled_flag")
d.FieldBool("entropy_coding_sync_enabled_flag")
if tilesEnabledFlag {
numTileColumnsMinus1 := d.FieldUintFn("num_tile_columns_minus1", uEV)
numTileRowsMinus1 := d.FieldUintFn("num_tile_rows_minus1", uEV)
uniformSpacingFlag := d.FieldBool("uniform_spacing_flag")
if !uniformSpacingFlag {
d.FieldArray("column_widths", func(d *decode.D) {
for i := uint64(0); i < numTileColumnsMinus1; i++ {
d.FieldUintFn("column_width", uEV)
}
})
d.FieldArray("row_heights", func(d *decode.D) {
for i := uint64(0); i < numTileRowsMinus1; i++ {
d.FieldUintFn("row_height", uEV)
}
})
}
d.FieldBool("loop_filter_across_tiles_enabled_flag")
}
d.FieldBool("pps_loop_filter_across_slices_enabled_flag")
deblockingFilterControlPresentFlag := d.FieldBool("deblocking_filter_control_present_flag")
if deblockingFilterControlPresentFlag {
d.FieldBool("deblocking_filter_override_enabled_flag")
ppsDeblockingFilterDisabledFlag := d.FieldBool("pps_deblocking_filter_disabled_flag")
if !ppsDeblockingFilterDisabledFlag {
d.FieldSintFn("pps_beta_offset_div2", sEV)
d.FieldSintFn("pps_tc_offset_div2", sEV)
}
}
ppsScalingListDataPresentFlag := d.FieldBool("pps_scaling_list_data_present_flag")
if ppsScalingListDataPresentFlag {
// TODO: scaling_list_data
return nil
}
d.FieldBool("lists_modification_present_flag")
d.FieldUintFn("log2_parallel_merge_level_minus2", uEV)
d.FieldBool("slice_segment_header_extension_present_flag")
ppsExtensionPresentFlag := d.FieldBool("pps_extension_present_flag")
if ppsExtensionPresentFlag {
d.FieldBool("pps_range_extension_flag")
d.FieldBool("pps_multilayer_extension_flag")
d.FieldBool("pps_3d_extension_flag")
d.FieldBool("pps_scc_extension_flag")
d.FieldU4("pps_extension_4bits")
}
// TODO: extensions
return nil
}
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