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71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
package mpeg
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// https://www.itu.int/rec/T-REC-H.265
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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)
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.HEVC_VPS,
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Description: "H.265/HEVC Video Parameter Set",
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DecodeFn: hevcVPSDecode,
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})
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}
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// H.265 page 33
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func hevcVPSDecode(d *decode.D, in interface{}) interface{} {
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d.FieldU4("vps_video_parameter_set_id")
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d.FieldBool("vps_base_layer_internal_flag")
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d.FieldBool("vps_base_layer_available_flag")
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d.FieldU6("vps_max_layers_minus1")
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vpsMaxSubLayersMinus1 := d.FieldU3("vps_max_sub_layers_minus1")
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d.FieldBool("vps_temporal_id_nesting_flag")
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d.FieldU16("vps_reserved_0xffff_16bits")
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profileTierLevelDecode(d, true, vpsMaxSubLayersMinus1)
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vpsSubLayerOrderingInfoPresentFlag := d.FieldBool("vps_sub_layer_ordering_info_present_flag")
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d.FieldArray("vps_sub_layer_ordering_infos", func(d *decode.D) {
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i := vpsMaxSubLayersMinus1
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if vpsSubLayerOrderingInfoPresentFlag {
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i = 0
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}
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for ; i <= vpsMaxSubLayersMinus1; i++ {
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d.FieldStruct("sps_sub_layer_ordering_info", func(d *decode.D) {
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d.FieldUFn("sps_max_dec_pic_buffering_minus1", uEV)
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d.FieldUFn("sps_max_num_reorder_pics", uEV)
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d.FieldUFn("sps_max_latency_increase_plus1", uEV)
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})
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}
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})
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vpsMaxLayerID := d.FieldU6("vps_max_layer_id")
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vpsNumLayerSetsMinus1 := d.FieldUFn("vps_num_layer_sets_minus1", uEV)
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d.FieldArray("layer_id_included_sets_flags", func(d *decode.D) {
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for i := uint64(0); i <= vpsNumLayerSetsMinus1; i++ {
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d.FieldArray("layer_id_included_sets_flags", func(d *decode.D) {
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for j := uint64(0); j <= vpsMaxLayerID; j++ {
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d.FieldBool("layer_id_included_flag_sets_flag")
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}
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})
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}
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})
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vpsTimingInfoPresentFlag := d.FieldBool("vps_timing_info_present_flag")
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if vpsTimingInfoPresentFlag {
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d.FieldU32("vps_num_units_in_tick")
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d.FieldU32("vps_time_scale")
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vpsPocProportionalToTimingFlag := d.FieldBool("vps_poc_proportional_to_timing_flag")
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if vpsPocProportionalToTimingFlag {
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d.FieldUFn("vps_num_ticks_poc_diff_one_minus1", uEV)
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}
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vpsHrdParametersPresentFlag := d.FieldBool("vps_hrd_parameters_present_flag")
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if vpsHrdParametersPresentFlag {
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hevcHrdParameters(d, true, vpsMaxSubLayersMinus1)
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}
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}
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// TODO:
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return nil
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}
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