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cut.go
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cut.go
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package ad_cutter
import (
"os"
)
func Cut(video string) CutResult {
result := CutResult{}
result.Video = video
output, err := generateRawData(video)
if err != nil {
result.ErrorMessage = err.Error()
return result
} else {
outputFile, err := os.Open(output)
if err != nil {
result.ErrorMessage = err.Error()
return result
}
stat, err := outputFile.Stat()
if err != nil {
result.ErrorMessage = err.Error()
return result
}
duration := int(stat.Size() / 8000)
pcmData := make([]byte, stat.Size())
if _, err := outputFile.Read(pcmData); err != nil {
result.ErrorMessage = err.Error()
return result
}
os.Remove(output)
resolution := 1000
sliceWidth := stat.Size() / int64(resolution)
i := int64(0)
resample := make([]int, 0)
for i+sliceWidth < stat.Size() {
resample = append(resample, int(pcmData[i])-127)
i += sliceWidth
}
zeroIndexCandidates := make([]int, 0)
for index, value := range resample {
if value == 0 {
zeroIndexCandidates = append(zeroIndexCandidates, index)
}
}
// 初次过滤零点,零点左边至少大于两倍右边的零点保留
zeroAccept := make([]int, 0)
for _, zeroIndex := range zeroIndexCandidates {
leftSlice := resample[0:zeroIndex]
rightSlice := resample[zeroIndex+1:]
if zeroIndex > resolution-zeroIndex {
continue
}
leftSum := int64(0)
for _, value := range leftSlice {
if value > 0 {
leftSum += int64(value)
}
}
rightSum := int64(0)
for _, value := range rightSlice {
if value > 0 {
rightSum += int64(value)
}
}
if leftSum > 2*rightSum {
zeroAccept = append(zeroAccept, zeroIndex)
}
}
cutIndex := 0
maxRate := 0
if len(zeroAccept) > 0 {
result.IsAd = true
for _, zeroIndex := range zeroAccept {
leftSlice := resample[0:zeroIndex]
rightSlice := resample[zeroIndex+1:]
leftCount := float64(0)
rightCount := float64(0)
for _, value := range leftSlice {
tmp := 0
if value < 0 {
tmp = -value
} else {
tmp = value
}
if tmp > 20 {
leftCount++
}
}
for _, value := range rightSlice {
tmp := 0
if value < 0 {
tmp = -value
} else {
tmp = value
}
if tmp > 20 {
rightCount++
}
}
leftDensity := leftCount / float64(zeroIndex)
rightDensity := rightCount / float64(resolution-zeroIndex-1)
if int(leftDensity/rightDensity) > maxRate {
cutIndex = zeroIndex
maxRate = int(leftDensity / rightDensity)
}
}
second := int(float64(duration) * (float64(cutIndex) / float64(resolution)))
_, err := cutMoive(video, second)
if err != nil {
result.IsCutted = false
result.ErrorMessage = err.Error()
} else {
result.IsCutted = true
}
} else {
result.IsAd = false
}
return result
}
}