Alexey Khit
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
package mov
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const (
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MoovTrakMdiaMinfStblStsdAvc1 = "avc1"
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MoovTrakMdiaMinfStblStsdAvc1AvcC = "avcC"
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MoovTrakMdiaMinfStblStsdHev1 = "hev1"
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MoovTrakMdiaMinfStblStsdHev1HvcC = "hvcC"
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MoovTrakMdiaMinfStblStsdMp4a = "mp4a"
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)
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func (m *Movie) WriteH26X(width, height uint16, conf []byte, h264 bool) {
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// https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
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if h264 {
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m.StartAtom(MoovTrakMdiaMinfStblStsdAvc1)
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} else {
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m.StartAtom(MoovTrakMdiaMinfStblStsdHev1)
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}
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m.Skip(6)
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m.WriteUint16(1) // data_reference_index
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m.Skip(2) // version
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m.Skip(2) // revision
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m.Skip(4) // vendor
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m.Skip(4) // temporal quality
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m.Skip(4) // spatial quality
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m.WriteUint16(width) // width
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m.WriteUint16(height) // height
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m.WriteFloat32(72) // horizontal resolution
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m.WriteFloat32(72) // vertical resolution
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m.Skip(4) // reserved
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m.WriteUint16(1) // frame count
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m.Skip(32) // compressor name
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m.WriteUint16(24) // depth
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m.WriteUint16(0xFFFF) // color table id (-1)
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if h264 {
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m.StartAtom(MoovTrakMdiaMinfStblStsdAvc1AvcC)
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} else {
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m.StartAtom(MoovTrakMdiaMinfStblStsdHev1HvcC)
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}
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m.Write(conf)
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m.EndAtom() // AVCC
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m.EndAtom() // AVC1
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}
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func (m *Movie) WriteMP4A(channels, sampleSize uint16, sampleRate uint32, conf []byte) {
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m.StartAtom(MoovTrakMdiaMinfStblStsdMp4a)
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m.Skip(6)
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m.WriteUint16(1) // data_reference_index
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m.Skip(2) // version
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m.Skip(2) // revision
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m.Skip(4) // vendor
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m.WriteUint16(channels) // channel_count
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m.WriteUint16(sampleSize) // sample_size
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m.Skip(2) // compression id
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m.Skip(2) // reserved
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m.WriteFloat32(float64(sampleRate)) // sample_rate
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m.WriteESDS(conf)
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m.EndAtom() // MP4A
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}
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func (m *Movie) WriteESDS(conf []byte) {
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m.StartAtom("esds")
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m.Skip(1) // version
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m.Skip(3) // flags
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// MP4ESDescrTag[3]:
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// - MP4DecConfigDescrTag[4]:
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// - MP4DecSpecificDescrTag[5]: conf
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// - Other[6]
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const header = 5
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const size3 = 3
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const size4 = 13
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size5 := byte(len(conf))
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const size6 = 1
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m.WriteBytes(3, 0x80, 0x80, 0x80, size3+header+size4+header+size5+header+size6)
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m.Skip(2) // es id
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m.Skip(1) // es flags
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m.WriteBytes(4, 0x80, 0x80, 0x80, size4+header+size5)
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m.WriteBytes(0x40) // object id
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m.WriteBytes(0x15) // stream type
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m.Skip(3) // buffer size db
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m.Skip(4) // max bitraga
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m.Skip(4) // avg bitraga
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m.WriteBytes(5, 0x80, 0x80, 0x80, size5)
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m.Write(conf)
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m.WriteBytes(6, 0x80, 0x80, 0x80, 1)
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m.WriteBytes(2) // ?
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m.EndAtom() // ESDS
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}
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