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32 lines
644 B
Go
32 lines
644 B
Go
package utils
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// GetAmrDuration - return .amr file duration form bytesData
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func GetAmrDuration(bytesData []byte) int32 {
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duration := -1
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packedSize := [16]int{12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0}
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length := len(bytesData)
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pos := 6
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var datas []byte
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frameCount := 0
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packedPos := -1
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for pos <= length {
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datas = bytesData[pos : pos+1]
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if len(datas) != 1 {
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if length > 0 {
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duration = (length - 6) / 650
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} else {
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duration = 0
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}
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break
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}
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packedPos = int((datas[0] >> 3) & 0x0F)
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pos += packedSize[packedPos] + 1
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frameCount++
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}
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duration += frameCount * 20
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return int32(duration/1000 + 1)
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}
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