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WIP: Passthrough Export #21

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WIP: Passthrough Export #21

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84 changes: 14 additions & 70 deletions LoveLiver/QuickTimeMov.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -58,76 +58,20 @@ class QuickTimeMov {
}

func write(_ dest : String, assetIdentifier : String) {
do {
// --------------------------------------------------
// reader for source video
// --------------------------------------------------
guard let track = self.track(AVMediaTypeVideo) else {
print("not found video track")
return
}
let (reader, output) = try self.reader(track,
settings: [kCVPixelBufferPixelFormatTypeKey as String:
NSNumber(value: kCVPixelFormatType_32BGRA as UInt32)])

// --------------------------------------------------
// writer for mov
// --------------------------------------------------
let writer = try AVAssetWriter(outputURL: URL(fileURLWithPath: dest), fileType: AVFileTypeQuickTimeMovie)
writer.metadata = [metadataFor(assetIdentifier)]

// video track
let input = AVAssetWriterInput(mediaType: AVMediaTypeVideo,
outputSettings: videoSettings(track.naturalSize))
input.expectsMediaDataInRealTime = true
input.transform = track.preferredTransform
writer.add(input)

// metadata track
let adapter = metadataAdapter()
writer.add(adapter.assetWriterInput)

// --------------------------------------------------
// creating video
// --------------------------------------------------
writer.startWriting()
reader.startReading()
writer.startSession(atSourceTime: kCMTimeZero)

// write metadata track
adapter.append(AVTimedMetadataGroup(items: [metadataForStillImageTime()],
timeRange: dummyTimeRange))

// write video track
input.requestMediaDataWhenReady(on: DispatchQueue(label: "assetAudioWriterQueue", attributes: [])) {
while(input.isReadyForMoreMediaData) {
if reader.status == .reading {
if let buffer = output.copyNextSampleBuffer() {
if !input.append(buffer) {
print("cannot write: \(writer.error)")
reader.cancelReading()
}
}
} else {
input.markAsFinished()
writer.finishWriting() {
if let e = writer.error {
print("cannot write: \(e)")
} else {
print("finish writing.")
}
}
}
}
}
while writer.status == .writing {
RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.5))
}
if let e = writer.error {
print("cannot write: \(e)")
}
} catch {
print("error")
guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetPassthrough) else {
print("cannot read asset: \(asset.debugDescription)")
return
}
exportSession.outputURL = URL(fileURLWithPath: dest)
exportSession.outputFileType = AVFileTypeQuickTimeMovie
exportSession.metadata = [metadataFor(assetIdentifier), metadataForStillImageTime()]
exportSession.exportAsynchronously {
}
while exportSession.status == .exporting || exportSession.status == .waiting {
RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.5))
}
if let e = exportSession.error {
print("cannot write: \(e)")
}
}

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