mirror of
https://github.com/wader/fq.git
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288 lines
10 KiB
Go
288 lines
10 KiB
Go
package mpeg
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import (
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"fmt"
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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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var mpegASCFormat []*decode.Format
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var vorbisPacketFormat []*decode.Format
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func init() {
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registry.MustRegister(&decode.Format{
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Name: format.MPEG_ES,
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Description: "MPEG Elementary Stream",
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DecodeFn: esDecode,
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Dependencies: []decode.Dependency{
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{Names: []string{format.MPEG_ASC}, Formats: &mpegASCFormat},
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{Names: []string{format.VORBIS_PACKET}, Formats: &vorbisPacketFormat},
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},
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})
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}
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const (
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Forbidden0 = 0x00
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ObjectDescrTag = 0x01
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InitialObjectDescrTag = 0x02
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ES_DescrTag = 0x03
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DecoderConfigDescrTag = 0x04
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DecSpecificInfoTag = 0x05
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SLConfigDescrTag = 0x06
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ContentIdentDescrTag = 0x07
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SupplContentIdentDescrTag = 0x08
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IPI_DescrPointerTag = 0x09
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IPMP_DescrPointerTag = 0x0A
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IPMP_DescrTag = 0x0B
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QoS_DescrTag = 0x0C
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RegistrationDescrTag = 0x0D
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ES_ID_IncTag = 0x0E
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ES_ID_RefTag = 0x0F
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MP4_IOD_Tag = 0x10
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MP4_OD_Tag = 0x11
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IPL_DescrPointerRefTag = 0x12
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ExtensionProfileLevelDescrTag = 0x13
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profileLevelIndicationIndexDescrTag = 0x14
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ContentClassificationDescrTag = 0x40
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KeyWordDescrTag = 0x41
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RatingDescrTag = 0x42
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LanguageDescrTag = 0x43
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ShortTextualDescrTag = 0x44
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ExpandedTextualDescrTag = 0x45
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ContentCreatorNameDescrTag = 0x46
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ContentCreationDateDescrTag = 0x47
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OCICreatorNameDescrTag = 0x48
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OCICreationDateDescrTag = 0x49
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SmpteCameraPositionDescrTag = 0x4A
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SegmentDescrTag = 0x4B
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MediaTimeDescrTag = 0x4C
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IPMP_ToolsListDescrTag = 0x60
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IPMP_ToolTag = 0x61
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M4MuxTimingDescrTag = 0x62
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M4MuxCodeTableDescrTag = 0x63
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ExtSLConfigDescrTag = 0x64
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M4MuxBufferSizeDescrTag = 0x65
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M4MuxIdentDescrTag = 0x66
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DependencyPointerTag = 0x67
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DependencyMarkerTag = 0x68
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M4MuxChannelDescrTag = 0x69
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Forbidden1 = 0xFF
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)
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var odTagNames = map[uint64]string{
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Forbidden0: "Forbidden",
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ObjectDescrTag: "ObjectDescrTag",
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InitialObjectDescrTag: "InitialObjectDescrTag",
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ES_DescrTag: "ES_DescrTag",
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DecoderConfigDescrTag: "DecoderConfigDescrTag",
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DecSpecificInfoTag: "DecSpecificInfoTag",
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SLConfigDescrTag: "SLConfigDescrTag",
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ContentIdentDescrTag: "ContentIdentDescrTag",
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SupplContentIdentDescrTag: "SupplContentIdentDescrTag",
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IPI_DescrPointerTag: "IPI_DescrPointerTag",
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IPMP_DescrPointerTag: "IPMP_DescrPointerTag",
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IPMP_DescrTag: "IPMP_DescrTag",
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QoS_DescrTag: "QoS_DescrTag",
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RegistrationDescrTag: "RegistrationDescrTag",
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ES_ID_IncTag: "ES_ID_IncTag",
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ES_ID_RefTag: "ES_ID_RefTag",
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MP4_IOD_Tag: "MP4_IOD_Tag",
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MP4_OD_Tag: "MP4_OD_Tag",
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IPL_DescrPointerRefTag: "IPL_DescrPointerRefTag",
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ExtensionProfileLevelDescrTag: "ExtensionProfileLevelDescrTag",
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profileLevelIndicationIndexDescrTag: "profileLevelIndicationIndexDescrTag",
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ContentClassificationDescrTag: "ContentClassificationDescrTag",
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KeyWordDescrTag: "KeyWordDescrTag",
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RatingDescrTag: "RatingDescrTag",
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LanguageDescrTag: "LanguageDescrTag",
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ShortTextualDescrTag: "ShortTextualDescrTag",
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ExpandedTextualDescrTag: "ExpandedTextualDescrTag",
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ContentCreatorNameDescrTag: "ContentCreatorNameDescrTag",
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ContentCreationDateDescrTag: "ContentCreationDateDescrTag",
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OCICreatorNameDescrTag: "OCICreatorNameDescrTag",
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OCICreationDateDescrTag: "OCICreationDateDescrTag",
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SmpteCameraPositionDescrTag: "SmpteCameraPositionDescrTag",
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SegmentDescrTag: "SegmentDescrTag",
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MediaTimeDescrTag: "MediaTimeDescrTag",
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IPMP_ToolsListDescrTag: "IPMP_ToolsListDescrTag",
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IPMP_ToolTag: "IPMP_ToolTag",
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M4MuxTimingDescrTag: "M4MuxTimingDescrTag",
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M4MuxCodeTableDescrTag: "M4MuxCodeTableDescrTag",
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ExtSLConfigDescrTag: "ExtSLConfigDescrTag",
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M4MuxBufferSizeDescrTag: "M4MuxBufferSizeDescrTag",
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M4MuxIdentDescrTag: "M4MuxIdentDescrTag",
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DependencyPointerTag: "DependencyPointerTag",
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DependencyMarkerTag: "DependencyMarkerTag",
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M4MuxChannelDescrTag: "M4MuxChannelDescrTag",
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Forbidden1: "Forbidden",
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}
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const (
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Forbidden = 0x00
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ObjectDescriptorStream = 0x01
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ClockReferenceStream = 0x02
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SceneDescriptionStream = 0x03
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VisualStream = 0x04
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AudioStream = 0x05
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MPEG7Stream = 0x06
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IPMPStream = 0x07
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ObjectContentInfoStream = 0x08
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MPEGJStream = 0x09
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InteractionStream = 0x0A
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IPMPToolStream = 0x0B
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)
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var streamTypeNames = map[uint64]string{
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Forbidden: "Forbidden",
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ObjectDescriptorStream: "ObjectDescriptorStream",
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ClockReferenceStream: "ClockReferenceStream",
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SceneDescriptionStream: "SceneDescriptionStream",
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VisualStream: "VisualStream",
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AudioStream: "AudioStream",
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MPEG7Stream: "MPEG7Stream",
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IPMPStream: "IPMPStream",
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ObjectContentInfoStream: "ObjectContentInfoStream",
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MPEGJStream: "MPEGJStream",
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InteractionStream: "InteractionStream",
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IPMPToolStream: "IPMPToolStream",
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}
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func esLengthEncoding(d *decode.D) uint64 {
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v := uint64(0)
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nextByte := true
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for nextByte {
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nextByte = d.Bool()
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v = v<<7 | d.U7()
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}
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return v
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}
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func fieldESLengthEncoding(d *decode.D, name string) uint64 {
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return d.FieldUFn(name, func() (uint64, decode.DisplayFormat, string) {
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return esLengthEncoding(d), decode.NumberDecimal, ""
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})
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}
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func fieldODDecodeTag(d *decode.D, edc *esDecodeContext, name string, expectedTagID int, fn func(d *decode.D)) { //nolint:unparam
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d.FieldStructFn(name, func(d *decode.D) {
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odDecodeTag(d, edc, expectedTagID, fn)
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})
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}
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type esDecodeContext struct {
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currentDecoderConfig *format.MpegDecoderConfig
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decoderConfigs []format.MpegDecoderConfig
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}
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func odDecodeTag(d *decode.D, edc *esDecodeContext, expectedTagID int, fn func(d *decode.D)) { //nolint:unparam
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odDecoders := map[uint64]func(d *decode.D){
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ES_DescrTag: func(d *decode.D) {
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d.FieldU16("es_id")
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streamDependencyFlag := d.FieldBool("stream_dependency_flag")
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urlFlag := d.FieldBool("url_flag")
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ocrStreamFlag := d.FieldBool("ocr_stream_flag")
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d.FieldU5("stream_priority")
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if streamDependencyFlag {
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d.FieldU16("dependency_on_es_id")
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}
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if urlFlag {
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urlLen := d.FieldU8("url_length")
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d.FieldUTF8("url", int(urlLen))
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}
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if ocrStreamFlag {
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d.FieldU16("ocr_es_id")
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}
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fieldODDecodeTag(d, edc, "dec_config_descr", -1, nil)
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fieldODDecodeTag(d, edc, "sl_config_descr", -1, nil)
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},
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DecoderConfigDescrTag: func(d *decode.D) {
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objectType, _ := d.FieldStringMapFn("object_type_indication", format.MpegObjectTypeNames, "Unknown", d.U8, decode.NumberDecimal)
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edc.decoderConfigs = append(edc.decoderConfigs, format.MpegDecoderConfig{
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ObjectType: int(objectType),
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})
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edc.currentDecoderConfig = &edc.decoderConfigs[len(edc.decoderConfigs)-1]
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d.FieldStringMapFn("stream_type", streamTypeNames, "Unknown", d.U6, decode.NumberDecimal)
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d.FieldBool("upstream")
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d.FieldBool("specific_info_flag")
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d.FieldU24("buffer_size_db")
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d.FieldU32("max_bit_rate")
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d.FieldU32("avg_bit_rate")
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// TODO: seems to be optional
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if d.BitsLeft() > 0 {
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switch objectType {
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// TODO: vorbis is special case?
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case format.MPEGObjectTypeVORBIS:
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fieldODDecodeTag(d, edc, "decoder_specific_info", -1, func(d *decode.D) {
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numPackets := d.FieldU8("num_packets")
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// TODO: lacing
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packetLengths := []int64{}
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// Xiph-style lacing (similar to ogg) of n-1 packets, last is reset of block
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d.FieldArrayFn("laces", func(d *decode.D) {
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for i := uint64(0); i < numPackets; i++ {
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l := d.FieldUFn("lace", func() (uint64, decode.DisplayFormat, string) {
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var l uint64
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for {
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n := d.U8()
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l += n
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if n < 255 {
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return l, decode.NumberDecimal, ""
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}
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}
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})
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packetLengths = append(packetLengths, int64(l))
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}
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})
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d.FieldArrayFn("packets", func(d *decode.D) {
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for _, l := range packetLengths {
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d.FieldFormatLen("packet", l*8, vorbisPacketFormat, nil)
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}
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d.FieldFormatLen("packet", d.BitsLeft(), vorbisPacketFormat, nil)
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})
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})
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default:
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switch format.MpegObjectTypeStreamType[objectType] {
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case format.MPEGStreamTypeAudio:
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fieldODDecodeTag(d, edc, "decoder_specific_info", -1, func(d *decode.D) {
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_, v := d.FieldFormat("audio_specific_config", mpegASCFormat, nil)
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mpegASCout, ok := v.(format.MPEGASCOut)
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if !ok {
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panic(fmt.Sprintf("expected MPEGASCOut got %#+v", v))
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}
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if edc.currentDecoderConfig != nil {
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edc.currentDecoderConfig.ASCObjectType = mpegASCout.ObjectType
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}
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})
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case format.MPEGStreamTypeVideo:
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// TODO:
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case format.MPEGStreamTypeText:
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// TODO:
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}
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}
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}
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},
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}
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// TODO: expectedTagID
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tagID, _ := d.FieldStringMapFn("tag_id", odTagNames, "Unknown", d.U8, decode.NumberDecimal)
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tagLen := fieldESLengthEncoding(d, "length")
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if fn != nil {
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d.DecodeLenFn(int64(tagLen)*8, fn)
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} else if tagDecoder, ok := odDecoders[tagID]; ok {
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d.DecodeLenFn(int64(tagLen)*8, tagDecoder)
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} else {
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d.FieldBitBufLen("data", d.BitsLeft())
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}
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}
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func esDecode(d *decode.D, in interface{}) interface{} {
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var edc esDecodeContext
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odDecodeTag(d, &edc, -1, nil)
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return format.MpegEsOut{DecoderConfigs: edc.decoderConfigs}
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}
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