mirror of
https://github.com/langhuihui/monibuca.git
synced 2026-04-23 01:07:03 +08:00
pggiroro
398 lines
11 KiB
Go
398 lines
11 KiB
Go
package mp4
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import (
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"slices"
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"m7s.live/v5/pkg"
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"m7s.live/v5/pkg/codec"
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. "m7s.live/v5/plugin/mp4/pkg/box"
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)
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type (
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Track struct {
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codec.ICodecCtx
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Cid MP4_CODEC_TYPE
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TrackId uint32
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SampleTable
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Duration uint32
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Timescale uint32
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// StartDts uint64
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// EndDts uint64
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// StartPts uint64
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// EndPts uint64
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Samplelist []Sample
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isFragment bool
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fragments []Fragment
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defaultSize uint32
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defaultDuration uint32
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// defaultSampleFlags uint32
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// baseDataOffset uint64
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// stbl []byte
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// FragmentSequenceNumber uint32
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//for subsample
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// defaultIsProtected uint8
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// defaultPerSampleIVSize uint8
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// defaultCryptByteBlock uint8
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// defaultSkipByteBlock uint8
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// defaultConstantIV []byte
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// defaultKID [16]byte
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// lastSeig *SeigSampleGroupEntry
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// lastSaiz *SaizBox
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// subSamples []SencEntry
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}
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Fragment struct {
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Offset uint64
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Duration uint32
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FirstTs uint64
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LastTs uint64
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}
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)
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func (track *Track) makeElstBox() *EditListBox {
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delay := track.Samplelist[0].Timestamp * 1000 / uint32(track.Timescale)
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entryCount := 1
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version := byte(0)
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boxSize := 12
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entrySize := 12
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if delay > 0xFFFFFFFF {
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version = 1
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entrySize = 20
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}
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// if delay > 0 {
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// entryCount += 1
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// }
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boxSize += 4 + entrySize*entryCount
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entrys := make([]ELSTEntry, entryCount)
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// if entryCount > 1 {
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// elst.entrys.entrys[0].segmentDuration = startCt
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// elst.entrys.entrys[0].mediaTime = -1
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// elst.entrys.entrys[0].mediaRateInteger = 0x0001
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// elst.entrys.entrys[0].mediaRateFraction = 0
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// }
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//使用第一个sample的时间戳作为MediaTime，确保时间轴对齐
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firstTimestamp := track.Samplelist[0].Timestamp
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firstCTS := track.Samplelist[0].CTS
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mediaTime := int64(firstTimestamp) + int64(firstCTS)
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entrys[entryCount-1].SegmentDuration = uint64(track.Duration)
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// MediaTime应该是第一个sample的PTS (DTS + CTS)
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entrys[entryCount-1].MediaTime = mediaTime
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entrys[entryCount-1].MediaRateInteger = 0x0001
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entrys[entryCount-1].MediaRateFraction = 0
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return CreateEditListBox(version, entrys)
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}
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func (track *Track) Seek(dts uint64) (idx int) {
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idx = -1
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for i, sample := range track.Samplelist {
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if track.Cid.IsVideo() && sample.KeyFrame {
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idx = i
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}
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if sample.Timestamp*1000/uint32(track.Timescale) > uint32(dts) {
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break
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}
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}
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return
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}
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func (track *Track) makeEdtsBox() *ContainerBox {
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return CreateContainerBox(TypeEDTS, track.makeElstBox())
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}
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func (track *Track) AddSampleEntry(entry Sample) {
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if len(track.Samplelist) < 1 {
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track.Duration = 0
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} else {
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delta := int64(entry.Timestamp - track.Samplelist[len(track.Samplelist)-1].Timestamp)
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track.Samplelist[len(track.Samplelist)-1].Duration = uint32(delta)
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if delta < 0 {
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track.Duration += 1
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} else {
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track.Duration += uint32(delta)
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}
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}
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track.Samplelist = append(track.Samplelist, entry)
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}
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func (track *Track) makeTkhdBox() *TrackHeaderBox {
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duration := uint64(track.Duration)
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tkhd := CreateTrackHeaderBox(track.TrackId, duration)
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switch ctx := track.ICodecCtx.(type) {
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case pkg.IVideoCodecCtx:
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tkhd.Width = uint32(ctx.Width()) << 16
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tkhd.Height = uint32(ctx.Height()) << 16
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case pkg.IAudioCodecCtx:
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tkhd.Volume = 0x0100
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}
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return tkhd
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}
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func (track *Track) makeMinfBox() *ContainerBox {
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var mhdbox IBox
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switch track.Cid {
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case MP4_CODEC_H264, MP4_CODEC_H265:
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mhdbox = CreateVideoMediaHeaderBox()
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case MP4_CODEC_G711A, MP4_CODEC_G711U, MP4_CODEC_AAC,
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MP4_CODEC_MP2, MP4_CODEC_MP3, MP4_CODEC_OPUS:
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mhdbox = CreateSoundMediaHeaderBox()
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default:
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panic("unsupport codec id")
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}
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dinfbox := CreateDataInformationBox()
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stblbox := track.makeStblBox()
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return CreateContainerBox(TypeMINF, mhdbox, dinfbox, stblbox)
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}
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func (track *Track) makeMdiaBox() *ContainerBox {
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duration := uint64(track.Duration)
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if track.isFragment {
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duration = 0
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}
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mdhdbox := CreateMediaHeaderBox(track.Timescale, duration)
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hdlrbox := MakeHdlrBox(GetHandlerType(track.Cid))
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minfbox := track.makeMinfBox()
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return CreateContainerBox(TypeMDIA, mdhdbox, hdlrbox, minfbox)
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}
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func (track *Track) makeStblBox() IBox {
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track.STSD = track.makeStsd()
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if !track.isFragment {
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if track.Cid == MP4_CODEC_H264 || track.Cid == MP4_CODEC_H265 {
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track.STSS = track.makeStssBox()
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}
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} else {
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track.STTS = CreateSTTSBox(nil)
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track.STSC = CreateSTSCBox(nil)
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track.STSZ = CreateSTSZBox(0, nil)
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track.STCO = CreateSTCOBox(nil)
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}
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return CreateContainerBox(TypeSTBL, track.STSD, track.STSS, track.STSZ, track.STSC, track.STTS, track.CTTS, track.STCO)
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}
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func (track *Track) makeStsd() *STSDBox {
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var avbox IBox
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var entry IBox
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switch ctx := track.ICodecCtx.(type) {
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case pkg.IVideoCodecCtx:
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switch track.Cid {
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case MP4_CODEC_H264:
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avbox = CreateDataBox(TypeAVCC, track.GetRecord())
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case MP4_CODEC_H265:
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avbox = CreateDataBox(TypeHVCC, track.GetRecord())
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}
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entry = CreateVisualSampleEntry(GetCodecNameWithCodecId(track.Cid), uint16(ctx.Width()), uint16(ctx.Height()), avbox)
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case pkg.IAudioCodecCtx:
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if track.Cid == MP4_CODEC_OPUS {
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avbox = CreateOpusSpecificBox(track.GetRecord())
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} else {
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avbox = CreateESDSBox(uint16(track.TrackId), track.Cid, track.GetRecord())
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}
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entry = CreateAudioSampleEntry(GetCodecNameWithCodecId(track.Cid), uint16(ctx.GetChannels()), uint16(ctx.GetSampleSize()), uint32(ctx.GetSampleRate()), avbox)
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}
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return CreateSTSDBox(entry)
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}
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func (track *Track) MakeMoof(fragmentId uint32) *ContainerBox {
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tfhd := track.makeTfhdBox(0)
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tfdt := track.makeTfdtBox()
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turnEntries := make([]TrunEntry, 0)
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for _, sample := range track.Samplelist {
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var sampleFlags uint32
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if sample.KeyFrame {
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sampleFlags = SAMPLE_FLAG_IS_LEADING | SAMPLE_FLAG_IS_DEPENDED_ON | SAMPLE_FLAG_DEPENDS_ON_NO
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} else {
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sampleFlags = SAMPLE_FLAG_DEPENDS_ON_YES
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}
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turnEntries = append(turnEntries, TrunEntry{
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SampleSize: uint32(sample.Size),
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SampleDuration: uint32(sample.Duration),
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SampleCompositionTimeOffset: int32(sample.CTS),
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SampleFlags: sampleFlags,
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})
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}
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trun := CreateTrackRunBox(TR_FLAG_DATA_OFFSET|TR_FLAG_DATA_SAMPLE_DURATION|TR_FLAG_DATA_SAMPLE_SIZE|TR_FLAG_DATA_SAMPLE_FLAGS|TR_FLAG_DATA_SAMPLE_COMPOSITION_TIME, turnEntries)
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traf := CreateContainerBox(TypeTRAF, tfhd, tfdt, trun)
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result := CreateContainerBox(TypeMOOF, CreateMovieFragmentHeaderBox(fragmentId), traf)
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trun.DataOffset = int32(result.Size()) + int32(BasicBoxLen) // TODO: mdat large than 4GB
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return result
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}
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func (track *Track) makeTfhdBox(moofOffset uint64) *TrackFragmentHeaderBox {
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tfFlags := uint32(0)
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// tfFlags |= TF_FLAG_DEFAULT_BASE_IS_MOOF
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// tfFlags |= TF_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT
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tfhd := CreateTrackFragmentHeaderBox(track.TrackId, tfFlags)
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tfhd.BaseDataOffset = moofOffset
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// Calculate default sample duration
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if len(track.Samplelist) > 1 {
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var totalDuration uint64 = 0
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var count int = 0
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for i := 1; i < len(track.Samplelist); i++ {
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duration := track.Samplelist[i].Timestamp - track.Samplelist[i-1].Timestamp
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if duration > 0 {
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totalDuration += uint64(duration)
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count++
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}
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}
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if count > 0 {
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tfhd.DefaultSampleDuration = uint32(totalDuration / uint64(count))
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}
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}
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// Set default sample size
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if len(track.Samplelist) > 0 {
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tfhd.DefaultSampleSize = uint32(track.Samplelist[0].Size)
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}
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// Set default sample flags
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if track.Cid.IsVideo() {
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tfhd.DefaultSampleFlags = 16842752
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} else {
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tfhd.DefaultSampleFlags = 0
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}
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return tfhd
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}
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func (track *Track) makeTfdtBox() *TrackFragmentBaseMediaDecodeTimeBox {
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return CreateTrackFragmentBaseMediaDecodeTimeBox(uint64(track.Samplelist[0].Timestamp))
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}
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func (track *Track) makeStssBox() *STSSBox {
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var stss []uint32
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for i, sample := range track.Samplelist {
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if sample.KeyFrame {
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stss = append(stss, uint32(i+1))
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}
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}
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return CreateSTSSBox(stss)
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}
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func (track *Track) makeTfraBox() *TrackFragmentRandomAccessBox {
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return CreateTrackFragmentRandomAccessBox(track.TrackId, slices.Collect(func(yield func(TFRAEntry) bool) {
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for _, f := range track.fragments {
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if !yield(TFRAEntry{
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Time: f.FirstTs,
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MoofOffset: f.Offset,
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TrafNumber: uint32(1),
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TrunNumber: uint32(1),
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SampleNumber: uint32(1),
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}) {
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break
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}
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}
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}))
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}
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func (track *Track) makeStblTable() {
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sameSize := true
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movchunks := make([]movchunk, 0)
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ckn := uint32(0)
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var stts []STTSEntry
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var ctts []CTTSEntry
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var stco []uint64
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for i, sample := range track.Samplelist {
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sttsEntry := STTSEntry{SampleCount: 1, SampleDelta: 1}
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cttsEntry := CTTSEntry{SampleCount: 1, SampleOffset: uint32(sample.CTS)}
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if i == len(track.Samplelist)-1 {
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stts = append(stts, sttsEntry)
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} else {
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var delta uint32 = 1
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if track.Samplelist[i+1].Timestamp >= sample.Timestamp {
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delta = track.Samplelist[i+1].Timestamp - sample.Timestamp
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}
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if len(stts) > 0 && delta == uint32(stts[len(stts)-1].SampleDelta) {
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stts[len(stts)-1].SampleCount++
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} else {
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sttsEntry.SampleDelta = uint32(delta)
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stts = append(stts, sttsEntry)
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}
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}
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if len(ctts) == 0 {
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ctts = append(ctts, cttsEntry)
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} else {
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if ctts[len(ctts)-1].SampleOffset == cttsEntry.SampleOffset {
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ctts[len(ctts)-1].SampleCount++
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} else {
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ctts = append(ctts, cttsEntry)
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}
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}
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if sameSize && i < len(track.Samplelist)-1 && track.Samplelist[i+1].Size != track.Samplelist[i].Size {
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sameSize = false
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}
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if i > 0 && sample.Offset == track.Samplelist[i-1].Offset+int64(track.Samplelist[i-1].Size) {
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movchunks[ckn-1].samplenum++
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} else {
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ck := movchunk{chunknum: ckn, samplenum: 1, chunkoffset: uint64(sample.Offset)}
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movchunks = append(movchunks, ck)
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stco = append(stco, uint64(sample.Offset))
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ckn++
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}
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}
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var sampleSize uint32
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var entrySizelist []uint32
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if sameSize {
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sampleSize = uint32(track.Samplelist[0].Size)
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} else {
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entrySizelist = make([]uint32, len(track.Samplelist))
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for i := 0; i < len(track.Samplelist); i++ {
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entrySizelist[i] = uint32(track.Samplelist[i].Size)
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}
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}
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var stsc []STSCEntry
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for i, chunk := range movchunks {
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if i == 0 || chunk.samplenum != movchunks[i-1].samplenum {
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stsc = append(stsc, STSCEntry{FirstChunk: chunk.chunknum + 1, SampleDescriptionIndex: 1, SamplesPerChunk: chunk.samplenum})
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}
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}
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if track.Cid == MP4_CODEC_H264 || track.Cid == MP4_CODEC_H265 {
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track.CTTS = CreateCTTSBox(ctts)
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}
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track.STTS = CreateSTTSBox(stts)
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track.STSC = CreateSTSCBox(stsc)
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track.STCO = CreateSTCOBox(stco)
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track.STSZ = CreateSTSZBox(sampleSize, entrySizelist)
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track.STSZ.SampleCount = uint32(len(track.Samplelist))
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}
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// func (track *Track) makeSidxBox(totalSidxSize uint32, refsize uint32) []byte {
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// sidx := NewSegmentIndexBox()
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// sidx.ReferenceID = track.TrackId
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// sidx.TimeScale = track.Timescale
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// sidx.EarliestPresentationTime = track.StartPts
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// sidx.ReferenceCount = 1
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// sidx.FirstOffset = 52 + uint64(totalSidxSize)
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// entry := SidxEntry{
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// ReferenceType: 0,
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// ReferencedSize: refsize,
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// SubsegmentDuration: 0,
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// StartsWithSAP: 1,
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// SAPType: 0,
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// SAPDeltaTime: 0,
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// }
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// if len(track.Samplelist) > 0 {
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// entry.SubsegmentDuration = uint32(track.Samplelist[len(track.Samplelist)-1].DTS) - uint32(track.StartDts)
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// }
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// sidx.Entrys = append(sidx.Entrys, entry)
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// sidx.Box.Box.Size = sidx.Size()
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// _, boxData := sidx.Encode()
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// return boxData
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// }
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