mirror of
https://github.com/langhuihui/monibuca.git
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64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package box
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import (
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"encoding/binary"
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"io"
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)
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// aligned(8) class TimeToSampleBox extends FullBox(’stts’, version = 0, 0) {
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// unsigned int(32) entry_count;
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// int i;
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// for (i=0; i < entry_count; i++) {
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// unsigned int(32) sample_count;
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// unsigned int(32) sample_delta;
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// }
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// }
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type TimeToSampleBox []STTSEntry
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func (stts TimeToSampleBox) Size() uint64 {
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return FullBoxLen + 4 + 8*uint64(len(stts))
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}
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func (stts *TimeToSampleBox) Decode(r io.Reader) (offset int, err error) {
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var fullbox FullBox
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if _, err = fullbox.Decode(r); err != nil {
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return
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}
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entryCountBuf := make([]byte, 4)
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if _, err = io.ReadFull(r, entryCountBuf); err != nil {
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return
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}
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offset = 8
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l := binary.BigEndian.Uint32(entryCountBuf)
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*stts = make([]STTSEntry, l)
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buf := make([]byte, l*8)
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if _, err = io.ReadFull(r, buf); err != nil {
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return
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}
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idx := 0
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for i := 0; i < int(l); i++ {
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(*stts)[i].SampleCount = binary.BigEndian.Uint32(buf[idx:])
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idx += 4
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(*stts)[i].SampleDelta = binary.BigEndian.Uint32(buf[idx:])
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idx += 4
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}
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offset += idx
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return
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}
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func (stts TimeToSampleBox) Encode() (int, []byte) {
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fullbox := NewFullBox(TypeSTTS, 0)
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fullbox.Box.Size = stts.Size()
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offset, buf := fullbox.Encode()
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binary.BigEndian.PutUint32(buf[offset:], uint32(len(stts)))
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offset += 4
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for _, entry := range stts {
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binary.BigEndian.PutUint32(buf[offset:], entry.SampleCount)
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offset += 4
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binary.BigEndian.PutUint32(buf[offset:], entry.SampleDelta)
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offset += 4
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}
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return offset, buf
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}
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