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52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
6 years ago
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package httpflv
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import (
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"github.com/q191201771/lal/bele"
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"github.com/q191201771/lal/log"
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)
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// TODO chef: move me to other packet
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// H.264-AVC-ISO_IEC_14496-15.pdf
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// 5.2.4 Decoder configuration information
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// <buf> body of tag
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func parseAvcSeqHeader(buf []byte) (sps, pps []byte, err error) {
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// TODO chef: check if read out of <buf> range
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if buf[0] != AvcKey || buf[1] != AvcPacketTypeSeqHeader || buf[2] != 0 || buf[3] != 0 || buf[4] != 0 {
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log.Error("parse avc seq header failed.")
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err = fxxkErr
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return
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}
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//configurationVersion := buf[5]
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//avcProfileIndication := buf[6]
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//profileCompatibility := buf[7]
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//avcLevelIndication := buf[8]
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//lengthSizeMinusOne := buf[9] & 0x03
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index := 10
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numOfSps := int(buf[index] & 0x1F)
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index++
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// TODO chef: if the situation of multi sps exist?
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// only take the last one.
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for i := 0; i < numOfSps; i++ {
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lenOfSps := int(bele.BeUInt16(buf[index:]))
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index += 2
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sps = append(sps, buf[index:index+lenOfSps]...)
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index += lenOfSps
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}
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numOfPps := int(buf[index] & 0x1F)
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index++
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for i := 0; i < numOfPps; i++ {
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lenOfPps := int(bele.BeUInt16(buf[index:]))
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index += 2
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pps = append(pps, buf[index:index+lenOfPps]...)
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index += lenOfPps
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}
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return
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}
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