private async Task UpdateRecordPreview(GeneratePreviewAction action, string previewPath)
{
using (var stream = File.OpenRead(previewPath))
{
await _facade.SetPreview(action.RecordId, new FileModel
{
Stream = stream,
FileName = Path.GetFileName(previewPath)
});
}
}
private TimeSpan GetSnapshotTime(GeneratePreviewAction action, IVideoStream stream)
{
if (action.TimeOfSnapshot.HasValue)
{
return(action.TimeOfSnapshot.Value);
}
var snapshotTime = stream.Duration.TotalMilliseconds / 5;
return(TimeSpan.FromMilliseconds(snapshotTime));
}
private async Task <ActionHandlerResult> Handle(GeneratePreviewAction action)
{
EnsureActionOutputIsImage(action);
var previewPath = await GeneratePreview(action);
if (previewPath == null)
{
return(ActionHandlerResult.Successful(action.OutputPath));
}
await UpdateRecordPreview(action, previewPath);
return(ActionHandlerResult.Successful(action.OutputPath, createNewRecord: false));
}
private Task <string> GeneratePreview(GeneratePreviewAction action)
{
var mediaType = _typeMapper.Map(Path.GetExtension(action.InputPath));
if (mediaType.Contains(MediaType.Video) || mediaType.Contains(MediaType.Gif))
{
return(GenerateForVideo(action));
}
//if (mediaType.Contains(MediaType.Image))
//{
// //
//}
return(Task.FromResult <string>(null));
}
private async Task <string> GenerateForVideo(GeneratePreviewAction action)
{
var info = await Xabe.FFmpeg.FFmpeg.GetMediaInfo(action.InputPath);
var snapshotTime = GetSnapshotTime(action, info.VideoStreams.First());
var conversion = await Xabe.FFmpeg.FFmpeg.Conversions.FromSnippet
.Snapshot(
action.InputPath,
action.OutputPath,
snapshotTime);
var result = await conversion.Start();
return(action.OutputPath);
}
private void EnsureActionOutputIsImage(GeneratePreviewAction action)
{
action.OutputPath = Path.Combine(
Path.GetDirectoryName(action.OutputPath),
Path.GetFileNameWithoutExtension(action.OutputPath) + ".jpg");
}
