private static IEnumerable<string> ExecuteFFMPEGAndGetImageFiles(ImageJobGroup imageJobGroup, string mediaFilePath)
{
using (var ffmpeg = new FFMPEGProcess(new FFMPEGProcessSettings(mediaFilePath, imageJobGroup.Timestamp - TimeSpan.FromSeconds(1))))
{
ffmpeg.Execute();
}
return GetImageFilePaths(imageJobGroup, mediaFilePath);
}
private static IEnumerable<string> GetImageFilePaths(ImageJobGroup group, string mediaFilePath)
{
var rootMediaFileName = Path.GetFileNameWithoutExtension(mediaFilePath);
return Directory.EnumerateFiles(
Directory.GetCurrentDirectory(),
string.Format(
"AUTOGEN_({0})_TIME_({1})_SNAPSHOT*.png",
rootMediaFileName,
FFMPEGProcess.FormatTimeSpanFileName(group.Timestamp)
)
);
}
/// <summary>
/// Groups ImageJobs by their timestamp
/// </summary>
/// <param name="imageJobs">The ImageJobs object containing all of the individual ImageJob(s)</param>
/// <returns>A map between timestamps and ImageJobGroups</returns>
public static IDictionary<TimeSpan, ImageJobGroup> GroupImageJobs(ImageJobs imageJobs)
{
var groups = new Dictionary<TimeSpan, ImageJobGroup>();
foreach (var imageJob in imageJobs.Images)
{
var focusTimeSpan = imageJob.SnapshotTimestamp;
ImageJobGroup group;
if (groups.TryGetValue(focusTimeSpan, out group) == false)
{
group = new ImageJobGroup
{
Jobs = new HashSet<ImageJob>(),
Timestamp = focusTimeSpan,
};
groups.Add(focusTimeSpan, group);
}
group.Jobs.Add(imageJob);
}
return groups;
}
private static IEnumerable<string> TakeSnapshots(ImageJobGroup imageJobGroup, IEnumerable<string> mediaFilePaths)
{
return from mediaFilePath in mediaFilePaths.AsParallel()
from snapshotPath in ExecuteFFMPEGAndGetImageFiles(imageJobGroup, mediaFilePath)
select snapshotPath;
}