public static async Task Write(VideoSetting videoSetting)
{
var localFolder = ApplicationData.Current.LocalFolder;
var configurationFile = await localFolder.CreateFileAsync(CONFIGURATION_FILE_NAME, CreationCollisionOption.OpenIfExists);
var configuration = new JsonObject
{
{ "VideoResolution", JsonValue.CreateNumberValue((int)videoSetting.VideoResolution) },
{ "VideoSubtype", JsonValue.CreateStringValue(VideoSubtypeHelper.Get(videoSetting.VideoSubtype)) },
{ "VideoQuality", JsonValue.CreateNumberValue(videoSetting.VideoQuality) },
{ "UsedThreads", JsonValue.CreateNumberValue(videoSetting.UsedThreads) }
};
VideoSetting = configuration;
await FileIO.WriteTextAsync(configurationFile, configuration.Stringify());
}
public static async Task <VideoSetting> Read(List <MediaFrameFormat> mediaFrameFormats)
{
VideoSetting videoSetting = null;
JsonObject configuration = null;
var configurationFileExists = await ApplicationData.Current.LocalFolder.TryGetItemAsync(CONFIGURATION_FILE_NAME);
if (configurationFileExists != null)
{
var configurationFile = await ApplicationData.Current.LocalFolder.GetFileAsync(CONFIGURATION_FILE_NAME);
configuration = JsonObject.Parse(await FileIO.ReadTextAsync(configurationFile));
}
if (configuration != null)
{
var videoResolution = (VideoResolution)configuration["VideoResolution"].GetNumber();
var videoResolutionWidthHeight = VideoResolutionWidthHeight.Get(videoResolution);
var videoSubType = configuration["VideoSubtype"].GetString();
var videoQuality = configuration["VideoQuality"].GetNumber();
var usedThreads = configuration["UsedThreads"].GetNumber();
var mediaFrameFormat = mediaFrameFormats.Where(m => m.Subtype == videoSubType &&
m.VideoFormat.Width == videoResolutionWidthHeight.Width &&
m.VideoFormat.Height == videoResolutionWidthHeight.Height)
.OrderByDescending(m => m.FrameRate.Numerator / m.FrameRate.Denominator)
.FirstOrDefault();
if (mediaFrameFormat != null)
{
videoSetting = new VideoSetting
{
VideoResolution = videoResolution,
VideoSubtype = VideoSubtypeHelper.Get(videoSubType),
VideoQuality = videoQuality,
UsedThreads = (int)usedThreads
};
}
}
else
{
for (int videoSubType = 0; videoSubType <= 2; videoSubType++)
{
if (videoSetting != null)
{
break;
}
for (int videoResolutionId = 4; videoResolutionId >= 0; videoResolutionId--)
{
var videoResolutionLowWidthHeight = VideoResolutionWidthHeight.Get((VideoResolution)videoResolutionId);
var mediaFrameFormat = mediaFrameFormats.Where(m => m.Subtype == VideoSubtypeHelper.Get((VideoSubtype)videoSubType) &&
m.VideoFormat.Width == videoResolutionLowWidthHeight.Width &&
m.VideoFormat.Height == videoResolutionLowWidthHeight.Height)
.OrderByDescending(m => m.FrameRate.Numerator / m.FrameRate.Denominator)
.FirstOrDefault();
if (mediaFrameFormat != null)
{
videoSetting = new VideoSetting
{
VideoResolution = VideoResolution.SD640_480,
VideoSubtype = (VideoSubtype)videoSubType,
VideoQuality = 0.6,
UsedThreads = 1
};
break;
}
}
}
}
if (videoSetting != null)
{
VideoSetting = new JsonObject
{
{ "VideoResolution", JsonValue.CreateNumberValue((int)videoSetting.VideoResolution) },
{ "VideoSubtype", JsonValue.CreateStringValue(VideoSubtypeHelper.Get(videoSetting.VideoSubtype)) },
{ "VideoQuality", JsonValue.CreateNumberValue(videoSetting.VideoQuality) },
{ "UsedThreads", JsonValue.CreateNumberValue(videoSetting.UsedThreads) }
};
return(videoSetting);
}
else
{
throw new Exception("Webcam not supported. Could not found correct video resolution and subtype. Please change code.");
}
}