mirror of
https://github.com/langhuihui/monibuca.git
synced 2025-12-24 13:48:04 +08:00
396 lines
11 KiB
Go
396 lines
11 KiB
Go
package mp4
|
||
|
||
import (
|
||
"slices"
|
||
|
||
. "m7s.live/v5/plugin/mp4/pkg/box"
|
||
)
|
||
|
||
type (
|
||
Track struct {
|
||
Cid MP4_CODEC_TYPE
|
||
TrackId uint32
|
||
SampleTable
|
||
Duration uint32
|
||
Height uint32
|
||
Width uint32
|
||
SampleRate uint32
|
||
SampleSize uint16
|
||
SampleCount uint32
|
||
ChannelCount uint8
|
||
Timescale uint32
|
||
// StartDts uint64
|
||
// EndDts uint64
|
||
// StartPts uint64
|
||
// EndPts uint64
|
||
Samplelist []Sample
|
||
ExtraData []byte
|
||
isFragment bool
|
||
fragments []Fragment
|
||
defaultSize uint32
|
||
defaultDuration uint32
|
||
// defaultSampleFlags uint32
|
||
// baseDataOffset uint64
|
||
// stbl []byte
|
||
// FragmentSequenceNumber uint32
|
||
|
||
//for subsample
|
||
// defaultIsProtected uint8
|
||
// defaultPerSampleIVSize uint8
|
||
// defaultCryptByteBlock uint8
|
||
// defaultSkipByteBlock uint8
|
||
// defaultConstantIV []byte
|
||
// defaultKID [16]byte
|
||
// lastSeig *SeigSampleGroupEntry
|
||
// lastSaiz *SaizBox
|
||
// subSamples []SencEntry
|
||
}
|
||
Fragment struct {
|
||
Offset uint64
|
||
Duration uint32
|
||
FirstTs uint64
|
||
LastTs uint64
|
||
}
|
||
)
|
||
|
||
func (track *Track) makeElstBox() *EditListBox {
|
||
delay := track.Samplelist[0].Timestamp * 1000 / uint32(track.Timescale)
|
||
entryCount := 1
|
||
version := byte(0)
|
||
boxSize := 12
|
||
entrySize := 12
|
||
if delay > 0xFFFFFFFF {
|
||
version = 1
|
||
entrySize = 20
|
||
}
|
||
// if delay > 0 {
|
||
// entryCount += 1
|
||
// }
|
||
boxSize += 4 + entrySize*entryCount
|
||
entrys := make([]ELSTEntry, entryCount)
|
||
|
||
// if entryCount > 1 {
|
||
// elst.entrys.entrys[0].segmentDuration = startCt
|
||
// elst.entrys.entrys[0].mediaTime = -1
|
||
|
||
// elst.entrys.entrys[0].mediaRateInteger = 0x0001
|
||
// elst.entrys.entrys[0].mediaRateFraction = 0
|
||
// }
|
||
|
||
//简单起见，mediaTime先固定为0,即不延迟播放
|
||
entrys[entryCount-1].SegmentDuration = uint64(track.Duration)
|
||
entrys[entryCount-1].MediaTime = 0
|
||
entrys[entryCount-1].MediaRateInteger = 0x0001
|
||
entrys[entryCount-1].MediaRateFraction = 0
|
||
|
||
return CreateEditListBox(version, entrys)
|
||
|
||
}
|
||
|
||
func (track *Track) Seek(dts uint64) int {
|
||
for i, sample := range track.Samplelist {
|
||
if sample.Timestamp*1000/uint32(track.Timescale) < uint32(dts) {
|
||
continue
|
||
} else if track.Cid.IsVideo() {
|
||
if sample.KeyFrame {
|
||
return i
|
||
}
|
||
} else {
|
||
return i
|
||
}
|
||
}
|
||
return -1
|
||
}
|
||
|
||
func (track *Track) makeEdtsBox() *ContainerBox {
|
||
return CreateContainerBox(TypeEDTS, track.makeElstBox())
|
||
}
|
||
|
||
func (track *Track) AddSampleEntry(entry Sample) {
|
||
if len(track.Samplelist) < 1 {
|
||
track.Duration = 0
|
||
} else {
|
||
delta := int64(entry.Timestamp - track.Samplelist[len(track.Samplelist)-1].Timestamp)
|
||
track.Samplelist[len(track.Samplelist)-1].Duration = uint32(delta)
|
||
if delta < 0 {
|
||
track.Duration += 1
|
||
} else {
|
||
track.Duration += uint32(delta)
|
||
}
|
||
}
|
||
track.Samplelist = append(track.Samplelist, entry)
|
||
}
|
||
|
||
func (track *Track) makeTkhdBox() *TrackHeaderBox {
|
||
duration := uint64(track.Duration)
|
||
tkhd := CreateTrackHeaderBox(track.TrackId, duration, track.Width, track.Height)
|
||
|
||
if track.Cid == MP4_CODEC_AAC || track.Cid == MP4_CODEC_G711A || track.Cid == MP4_CODEC_G711U || track.Cid == MP4_CODEC_OPUS {
|
||
tkhd.Volume = 0x0100
|
||
} else {
|
||
tkhd.Width = track.Width << 16
|
||
tkhd.Height = track.Height << 16
|
||
}
|
||
return tkhd
|
||
}
|
||
|
||
func (track *Track) makeMinfBox() *ContainerBox {
|
||
var mhdbox IBox
|
||
switch track.Cid {
|
||
case MP4_CODEC_H264, MP4_CODEC_H265:
|
||
mhdbox = CreateVideoMediaHeaderBox()
|
||
|
||
case MP4_CODEC_G711A, MP4_CODEC_G711U, MP4_CODEC_AAC,
|
||
MP4_CODEC_MP2, MP4_CODEC_MP3, MP4_CODEC_OPUS:
|
||
mhdbox = CreateSoundMediaHeaderBox()
|
||
default:
|
||
panic("unsupport codec id")
|
||
}
|
||
dinfbox := CreateDataInformationBox()
|
||
stblbox := track.makeStblBox()
|
||
return CreateContainerBox(TypeMINF, mhdbox, dinfbox, stblbox)
|
||
}
|
||
|
||
func (track *Track) makeMdiaBox() *ContainerBox {
|
||
duration := uint64(track.Duration)
|
||
if track.isFragment {
|
||
duration = 0
|
||
}
|
||
mdhdbox := CreateMediaHeaderBox(track.Timescale, duration)
|
||
hdlrbox := MakeHdlrBox(GetHandlerType(track.Cid))
|
||
minfbox := track.makeMinfBox()
|
||
return CreateContainerBox(TypeMDIA, mdhdbox, hdlrbox, minfbox)
|
||
}
|
||
|
||
func (track *Track) makeStblBox() IBox {
|
||
track.STSD = track.makeStsd(GetHandlerType(track.Cid))
|
||
if !track.isFragment {
|
||
if track.Cid == MP4_CODEC_H264 || track.Cid == MP4_CODEC_H265 {
|
||
track.STSS = track.makeStssBox()
|
||
}
|
||
} else {
|
||
track.STTS = CreateSTTSBox(nil)
|
||
track.STSC = CreateSTSCBox(nil)
|
||
track.STSZ = CreateSTSZBox(0, nil)
|
||
track.STCO = CreateSTCOBox(nil)
|
||
}
|
||
return CreateContainerBox(TypeSTBL, track.STSD, track.STSS, track.STSZ, track.STSC, track.STTS, track.CTTS, track.STCO)
|
||
}
|
||
|
||
func (track *Track) makeStsd(handler_type HandlerType) *STSDBox {
|
||
var avbox IBox
|
||
if track.Cid == MP4_CODEC_H264 {
|
||
avbox = CreateDataBox(TypeAVCC, track.ExtraData)
|
||
} else if track.Cid == MP4_CODEC_H265 {
|
||
avbox = CreateDataBox(TypeHVCC, track.ExtraData)
|
||
} else if track.Cid == MP4_CODEC_AAC || track.Cid == MP4_CODEC_MP2 || track.Cid == MP4_CODEC_MP3 {
|
||
avbox = CreateESDSBox(uint16(track.TrackId), track.Cid, track.ExtraData)
|
||
} else if track.Cid == MP4_CODEC_OPUS {
|
||
avbox = CreateOpusSpecificBox(track.ExtraData)
|
||
}
|
||
var entry IBox
|
||
if handler_type == TypeVIDE {
|
||
entry = CreateVisualSampleEntry(GetCodecNameWithCodecId(track.Cid), uint16(track.Width), uint16(track.Height), avbox)
|
||
} else if handler_type == TypeSOUN {
|
||
entry = CreateAudioSampleEntry(GetCodecNameWithCodecId(track.Cid), uint16(track.ChannelCount), uint16(track.SampleSize), track.SampleRate, avbox)
|
||
}
|
||
return CreateSTSDBox(entry)
|
||
}
|
||
|
||
func (track *Track) MakeMoof(fragmentId uint32) *ContainerBox {
|
||
tfhd := track.makeTfhdBox(0)
|
||
tfdt := track.makeTfdtBox()
|
||
|
||
turnEntries := make([]TrunEntry, 0)
|
||
for _, sample := range track.Samplelist {
|
||
var sampleFlags uint32
|
||
if sample.KeyFrame {
|
||
sampleFlags = SAMPLE_FLAG_IS_LEADING | SAMPLE_FLAG_IS_DEPENDED_ON | SAMPLE_FLAG_DEPENDS_ON_NO
|
||
} else {
|
||
sampleFlags = SAMPLE_FLAG_DEPENDS_ON_YES
|
||
}
|
||
turnEntries = append(turnEntries, TrunEntry{
|
||
SampleSize: uint32(sample.Size),
|
||
SampleDuration: uint32(sample.Duration),
|
||
SampleCompositionTimeOffset: int32(sample.CTS),
|
||
SampleFlags: sampleFlags,
|
||
})
|
||
}
|
||
|
||
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)
|
||
|
||
traf := CreateContainerBox(TypeTRAF, tfhd, tfdt, trun)
|
||
result := CreateContainerBox(TypeMOOF, CreateMovieFragmentHeaderBox(fragmentId), traf)
|
||
trun.DataOffset = int32(result.Size()) + int32(BasicBoxLen) // TODO: mdat large than 4GB
|
||
return result
|
||
}
|
||
|
||
func (track *Track) makeTfhdBox(moofOffset uint64) *TrackFragmentHeaderBox {
|
||
tfFlags := uint32(0)
|
||
// tfFlags |= TF_FLAG_DEFAULT_BASE_IS_MOOF
|
||
// tfFlags |= TF_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT
|
||
tfhd := CreateTrackFragmentHeaderBox(track.TrackId, tfFlags)
|
||
tfhd.BaseDataOffset = moofOffset
|
||
// Calculate default sample duration
|
||
if len(track.Samplelist) > 1 {
|
||
var totalDuration uint64 = 0
|
||
var count int = 0
|
||
for i := 1; i < len(track.Samplelist); i++ {
|
||
duration := track.Samplelist[i].Timestamp - track.Samplelist[i-1].Timestamp
|
||
if duration > 0 {
|
||
totalDuration += uint64(duration)
|
||
count++
|
||
}
|
||
}
|
||
if count > 0 {
|
||
tfhd.DefaultSampleDuration = uint32(totalDuration / uint64(count))
|
||
}
|
||
}
|
||
|
||
// Set default sample size
|
||
if len(track.Samplelist) > 0 {
|
||
tfhd.DefaultSampleSize = uint32(track.Samplelist[0].Size)
|
||
}
|
||
|
||
// Set default sample flags
|
||
if track.Cid.IsVideo() {
|
||
tfhd.DefaultSampleFlags = 16842752
|
||
} else {
|
||
tfhd.DefaultSampleFlags = 0
|
||
}
|
||
return tfhd
|
||
}
|
||
|
||
func (track *Track) makeTfdtBox() *TrackFragmentBaseMediaDecodeTimeBox {
|
||
return CreateTrackFragmentBaseMediaDecodeTimeBox(uint64(track.Samplelist[0].Timestamp))
|
||
}
|
||
|
||
func (track *Track) makeStssBox() *STSSBox {
|
||
var stss []uint32
|
||
for i, sample := range track.Samplelist {
|
||
if sample.KeyFrame {
|
||
stss = append(stss, uint32(i+1))
|
||
}
|
||
}
|
||
return CreateSTSSBox(stss)
|
||
}
|
||
|
||
func (track *Track) makeTfraBox() *TrackFragmentRandomAccessBox {
|
||
return CreateTrackFragmentRandomAccessBox(track.TrackId, slices.Collect(func(yield func(TFRAEntry) bool) {
|
||
for _, f := range track.fragments {
|
||
if !yield(TFRAEntry{
|
||
Time: f.FirstTs,
|
||
MoofOffset: f.Offset,
|
||
TrafNumber: uint32(1),
|
||
TrunNumber: uint32(1),
|
||
SampleNumber: uint32(1),
|
||
}) {
|
||
break
|
||
}
|
||
}
|
||
}))
|
||
}
|
||
|
||
func (track *Track) makeStblTable() {
|
||
sameSize := true
|
||
movchunks := make([]movchunk, 0)
|
||
ckn := uint32(0)
|
||
var stts []STTSEntry
|
||
var ctts []CTTSEntry
|
||
var stco []uint64
|
||
|
||
for i, sample := range track.Samplelist {
|
||
sttsEntry := STTSEntry{SampleCount: 1, SampleDelta: 1}
|
||
cttsEntry := CTTSEntry{SampleCount: 1, SampleOffset: uint32(sample.CTS)}
|
||
if i == len(track.Samplelist)-1 {
|
||
stts = append(stts, sttsEntry)
|
||
} else {
|
||
var delta uint32 = 1
|
||
if track.Samplelist[i+1].Timestamp >= sample.Timestamp {
|
||
delta = track.Samplelist[i+1].Timestamp - sample.Timestamp
|
||
}
|
||
|
||
if len(stts) > 0 && delta == uint32(stts[len(stts)-1].SampleDelta) {
|
||
stts[len(stts)-1].SampleCount++
|
||
} else {
|
||
sttsEntry.SampleDelta = uint32(delta)
|
||
stts = append(stts, sttsEntry)
|
||
}
|
||
}
|
||
|
||
if len(ctts) == 0 {
|
||
ctts = append(ctts, cttsEntry)
|
||
} else {
|
||
if ctts[len(ctts)-1].SampleOffset == cttsEntry.SampleOffset {
|
||
ctts[len(ctts)-1].SampleCount++
|
||
} else {
|
||
ctts = append(ctts, cttsEntry)
|
||
}
|
||
}
|
||
if sameSize && i < len(track.Samplelist)-1 && track.Samplelist[i+1].Size != track.Samplelist[i].Size {
|
||
sameSize = false
|
||
}
|
||
if i > 0 && sample.Offset == track.Samplelist[i-1].Offset+int64(track.Samplelist[i-1].Size) {
|
||
movchunks[ckn-1].samplenum++
|
||
} else {
|
||
ck := movchunk{chunknum: ckn, samplenum: 1, chunkoffset: uint64(sample.Offset)}
|
||
movchunks = append(movchunks, ck)
|
||
stco = append(stco, uint64(sample.Offset))
|
||
ckn++
|
||
}
|
||
}
|
||
var sampleSize uint32
|
||
var entrySizelist []uint32
|
||
|
||
if sameSize {
|
||
sampleSize = uint32(track.Samplelist[0].Size)
|
||
} else {
|
||
entrySizelist = make([]uint32, len(track.Samplelist))
|
||
|
||
for i := 0; i < len(track.Samplelist); i++ {
|
||
entrySizelist[i] = uint32(track.Samplelist[i].Size)
|
||
}
|
||
|
||
}
|
||
|
||
var stsc []STSCEntry
|
||
for i, chunk := range movchunks {
|
||
if i == 0 || chunk.samplenum != movchunks[i-1].samplenum {
|
||
stsc = append(stsc, STSCEntry{FirstChunk: chunk.chunknum + 1, SampleDescriptionIndex: 1, SamplesPerChunk: chunk.samplenum})
|
||
}
|
||
}
|
||
if track.Cid == MP4_CODEC_H264 || track.Cid == MP4_CODEC_H265 {
|
||
track.CTTS = CreateCTTSBox(ctts)
|
||
}
|
||
track.STTS = CreateSTTSBox(stts)
|
||
track.STSC = CreateSTSCBox(stsc)
|
||
track.STCO = CreateSTCOBox(stco)
|
||
track.STSZ = CreateSTSZBox(sampleSize, entrySizelist)
|
||
track.STSZ.SampleCount = uint32(len(track.Samplelist))
|
||
}
|
||
|
||
// func (track *Track) makeSidxBox(totalSidxSize uint32, refsize uint32) []byte {
|
||
// sidx := NewSegmentIndexBox()
|
||
// sidx.ReferenceID = track.TrackId
|
||
// sidx.TimeScale = track.Timescale
|
||
// sidx.EarliestPresentationTime = track.StartPts
|
||
// sidx.ReferenceCount = 1
|
||
// sidx.FirstOffset = 52 + uint64(totalSidxSize)
|
||
// entry := SidxEntry{
|
||
// ReferenceType: 0,
|
||
// ReferencedSize: refsize,
|
||
// SubsegmentDuration: 0,
|
||
// StartsWithSAP: 1,
|
||
// SAPType: 0,
|
||
// SAPDeltaTime: 0,
|
||
// }
|
||
|
||
// if len(track.Samplelist) > 0 {
|
||
// entry.SubsegmentDuration = uint32(track.Samplelist[len(track.Samplelist)-1].DTS) - uint32(track.StartDts)
|
||
// }
|
||
// sidx.Entrys = append(sidx.Entrys, entry)
|
||
// sidx.Box.Box.Size = sidx.Size()
|
||
// _, boxData := sidx.Encode()
|
||
// return boxData
|
||
// }
|