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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_VPS,
&decode.Format{
Description: "H.265/HEVC Video Parameter Set",
DecodeFn: hevcVPSDecode,
})
}
const maxVpsLayers = 1000
// H.265 page 33
func hevcVPSDecode(d *decode.D) any {
d.FieldU4("vps_video_parameter_set_id")
d.FieldBool("vps_base_layer_internal_flag")
d.FieldBool("vps_base_layer_available_flag")
d.FieldU6("vps_max_layers_minus1")
vpsMaxSubLayersMinus1 := d.FieldU3("vps_max_sub_layers_minus1")
d.FieldBool("vps_temporal_id_nesting_flag")
d.FieldU16("vps_reserved_0xffff_16bits")
profileTierLevelDecode(d, true, vpsMaxSubLayersMinus1)
vpsSubLayerOrderingInfoPresentFlag := d.FieldBool("vps_sub_layer_ordering_info_present_flag")
d.FieldArray("vps_sub_layer_ordering_infos", func(d *decode.D) {
i := vpsMaxSubLayersMinus1
if vpsSubLayerOrderingInfoPresentFlag {
i = 0
}
for ; i <= vpsMaxSubLayersMinus1; i++ {
d.FieldStruct("sps_sub_layer_ordering_info", func(d *decode.D) {
d.FieldUintFn("sps_max_dec_pic_buffering_minus1", uEV)
d.FieldUintFn("sps_max_num_reorder_pics", uEV)
d.FieldUintFn("sps_max_latency_increase_plus1", uEV)
})
}
})
vpsMaxLayerID := d.FieldU6("vps_max_layer_id")
vpsNumLayerSetsMinus1 := d.FieldUintFn("vps_num_layer_sets_minus1", uEV)
if vpsNumLayerSetsMinus1 > maxVpsLayers {
d.Errorf("too many vps layers %d > %d", vpsNumLayerSetsMinus1, maxVpsLayers)
}
d.FieldArray("layer_id_included_sets_flags", func(d *decode.D) {
for i := uint64(0); i <= vpsNumLayerSetsMinus1; i++ {
d.FieldArray("layer_id_included_sets_flags", func(d *decode.D) {
for j := uint64(0); j <= vpsMaxLayerID; j++ {
d.FieldBool("layer_id_included_flag_sets_flag")
}
})
}
})
vpsTimingInfoPresentFlag := d.FieldBool("vps_timing_info_present_flag")
if vpsTimingInfoPresentFlag {
d.FieldU32("vps_num_units_in_tick")
d.FieldU32("vps_time_scale")
vpsPocProportionalToTimingFlag := d.FieldBool("vps_poc_proportional_to_timing_flag")
if vpsPocProportionalToTimingFlag {
d.FieldUintFn("vps_num_ticks_poc_diff_one_minus1", uEV)
}
vpsHrdParametersPresentFlag := d.FieldBool("vps_hrd_parameters_present_flag")
if vpsHrdParametersPresentFlag {
hevcHrdParameters(d, true, vpsMaxSubLayersMinus1)
}
}
// TODO:
return nil
}
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