public async Task <IAsyncActionWithProgress <double> > StartTranscodeMedia(StorageFile inputFile, StorageFile outFile, MediaEncodingProfile profile)
{
MediaTranscoder transcoder = new MediaTranscoder();
PrepareTranscodeResult prepareOp = await transcoder.PrepareFileTranscodeAsync(inputFile, outFile, profile);
if (prepareOp.CanTranscode)
{
var transcodeOp = prepareOp.TranscodeAsync();
transcodeOp.Progress += new AsyncActionProgressHandler <double>((asyncInfo, e) =>
{
ProcessingProgressChanged?.Invoke(this, e);
});
transcodeOp.Completed += new AsyncActionWithProgressCompletedHandler <double>((asyncInfo, status) =>
{
asyncInfo.GetResults();
switch (status)
{
case AsyncStatus.Canceled:
ProcessingCanceled?.Invoke(this, new EventArgs());
break;
case AsyncStatus.Completed:
ProcessingCompleted?.Invoke(this, new EventArgs());
break;
case AsyncStatus.Started:
break;
case AsyncStatus.Error:
default:
ProcessingError?.Invoke(this, "转码失败");
break;
}
});
return(transcodeOp);
}
else
{
switch (prepareOp.FailureReason)
{
case TranscodeFailureReason.CodecNotFound:
ProcessingError?.Invoke(this, "转码失败:找不到编解码器");
break;
case TranscodeFailureReason.InvalidProfile:
ProcessingError?.Invoke(this, "转码失败:配置文件无效");
break;
default:
ProcessingError?.Invoke(this, "转码失败:未知错误");
break;
}
return(null);
}
}
public async Task <IAsyncOperationWithProgress <TranscodeFailureReason, double> > StartCompositionDashMedia(IList <StorageFile> inputFiles, StorageFile outFile, MediaEncodingProfile profile = null)
{
MediaComposition composition = new MediaComposition();
var clip = await MediaClip.CreateFromFileAsync(inputFiles.FirstOrDefault(x => x.Name == "video.m4s"));
composition.Clips.Add(clip);
var backgroundTrack = await BackgroundAudioTrack.CreateFromFileAsync(inputFiles.FirstOrDefault(x => x.Name == "audio.m4s"));
composition.BackgroundAudioTracks.Add(backgroundTrack);
IAsyncOperationWithProgress <TranscodeFailureReason, double> saveOperation = null;
if (profile != null)
{
saveOperation = composition.RenderToFileAsync(outFile, MediaTrimmingPreference.Fast, profile);
}
else
{
saveOperation = composition.RenderToFileAsync(outFile, MediaTrimmingPreference.Fast);
}
saveOperation.Progress = new AsyncOperationProgressHandler <TranscodeFailureReason, double>((info, progress) =>
{
ProcessingProgressChanged?.Invoke(this, progress);
});
saveOperation.Completed = new AsyncOperationWithProgressCompletedHandler <TranscodeFailureReason, double>((info, status) =>
{
if (status == AsyncStatus.Canceled)
{
ProcessingCanceled?.Invoke(this, new EventArgs());
return;
}
var results = info.GetResults();
if (results != TranscodeFailureReason.None || status != AsyncStatus.Completed)
{
ProcessingError?.Invoke(this, "合并失败:未知错误");
}
else
{
ProcessingCompleted?.Invoke(this, new EventArgs());
}
});
return(saveOperation);
}
protected virtual void OnProcessingCanceled()
{
ProcessingCanceled?.Invoke(this, new ImageProcessingEventArgs());
}
