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0829c167cc
Basic support, can also do CER and DER but without any extra validation. No schema support. Redo format doc.md usage a bit, now format/<dir>/<format>.md instead. Related to #20
120 lines
4.4 KiB
Go
120 lines
4.4 KiB
Go
package mpeg
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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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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.AVC_SEI,
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Description: "H.264/AVC Supplemental Enhancement Information",
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DecodeFn: avcSEIDecode,
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})
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}
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const (
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avcSEIUserDataUnregistered = 5
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)
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var seiNames = scalar.UToSymStr{
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0: "buffering_period",
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1: "pic_timing",
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2: "pan_scan_rect",
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3: "filler_payload",
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4: "user_data_registered_itu_t_t35",
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avcSEIUserDataUnregistered: "user_data_unregistered",
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6: "recovery_point",
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7: "dec_ref_pic_marking_repetition",
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8: "spare_pic",
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9: "scene_info",
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10: "sub_seq_info",
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11: "sub_seq_layer_characteristics",
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12: "sub_seq_characteristics",
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13: "full_frame_freeze",
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14: "full_frame_freeze_release",
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15: "full_frame_snapshot",
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16: "progressive_refinement_segment_start",
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17: "progressive_refinement_segment_end",
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18: "motion_constrained_slice_group_set",
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19: "film_grain_characteristics",
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20: "deblocking_filter_display_preference",
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21: "stereo_video_info",
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22: "post_filter_hint",
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23: "tone_mapping_info",
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24: "scalability_info",
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25: "sub_pic_scalable_layer",
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26: "non_required_layer_rep",
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27: "priority_layer_info",
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28: "layers_not_present",
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29: "layer_dependency_change",
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30: "scalable_nesting",
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31: "base_layer_temporal_hrd",
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32: "quality_layer_integrity_check",
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33: "redundant_pic_property",
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34: "tl0_dep_rep_index",
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35: "tl_switching_point",
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36: "parallel_decoding_info",
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37: "mvc_scalable_nesting",
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38: "view_scalability_info",
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39: "multiview_scene_info",
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40: "multiview_acquisition_info",
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41: "non_required_view_component",
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42: "view_dependency_change",
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43: "operation_points_not_present",
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44: "base_view_temporal_hrd",
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45: "frame_packing_arrangement",
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46: "multiview_view_position",
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47: "display_orientation",
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48: "mvcd_scalable_nesting",
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49: "mvcd_view_scalability_info",
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50: "depth_representation_info",
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51: "three_dimensional_reference_displays_info",
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52: "depth_timing",
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53: "depth_sampling_info",
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54: "constrained_depth_parameter_set_identifier",
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56: "green_metadata",
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137: "mastering_display_colour_volume",
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181: "alternative_depth_info",
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}
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var (
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x264Bytes = [16]byte{0xdc, 0x45, 0xe9, 0xbd, 0xe6, 0xd9, 0x48, 0xb7, 0x96, 0x2c, 0xd8, 0x20, 0xd9, 0x23, 0xee, 0xef}
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)
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var userDataUnregisteredNames = scalar.BytesToScalar{
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{Bytes: x264Bytes[:], Scalar: scalar.S{Sym: "x264"}},
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}
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// sum bytes until < 0xff
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func ffSum(d *decode.D) uint64 {
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var s uint64
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for {
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b := d.U8()
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s += b
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if b < 0xff {
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break
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}
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}
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return s
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}
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func avcSEIDecode(d *decode.D, in interface{}) interface{} {
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payloadType := d.FieldUFn("payload_type", func(d *decode.D) uint64 { return ffSum(d) }, seiNames)
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payloadSize := d.FieldUFn("payload_size", func(d *decode.D) uint64 { return ffSum(d) })
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d.FramedFn(int64(payloadSize)*8, func(d *decode.D) {
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switch payloadType {
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case avcSEIUserDataUnregistered:
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d.FieldRawLen("uuid", 16*8, userDataUnregisteredNames)
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}
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d.FieldRawLen("data", d.BitsLeft())
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})
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d.FieldRawLen("rbsp_trailing_bits", d.BitsLeft())
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return nil
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}
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