/// <summary>
/// By default, we use the WMVideo9 Encoder DMO, WMV1 media type
///
/// We support 3 basic default bit rates for video
/// 100 Kbps for video < 320 x 240
/// 300 Kbps for video >e; 320 x 240 && < 640 x 480
/// 1 Mbps for video >e; 640 x 480
/// </summary>
private void DefaultVideoCompressorSettings()
{
// Read camera's current media type
_AMMediaType mt;
object fb;
cg.Source.GetMediaType(out mt, out fb);
int bmpRes = 640 * 480;
if (fb is VIDEOINFOHEADER)
{
VIDEOINFOHEADER vih = (VIDEOINFOHEADER)fb;
bmpRes = vih.BitmapInfo.Height * vih.BitmapInfo.Width;
}
else if (fb is DVINFO)
{
DVCaptureGraph dvcg = cg as DVCaptureGraph;
if (dvcg != null)
{
dvcg.GetVideoMediaType(out mt, out fb);
if (fb is VIDEOINFOHEADER)
{
VIDEOINFOHEADER vih = (VIDEOINFOHEADER)fb;
bmpRes = vih.BitmapInfo.Height * vih.BitmapInfo.Width;
}
}
}
else
{
Debug.Fail(string.Format(CultureInfo.CurrentCulture,
"We were expecting a DVINFO or VIDEOINFOHEADER format block, not a {0}",
MediaType.FormatType.GuidToString(mt.formattype)));
return;
}
// Construct the compressor settings
VideoCompressorQualityInfo vcqi = DefaultQualityInfo();
if (bmpRes < 320 * 240)
{
vcqi.BitRate = 100000;
}
else if (bmpRes < 640 * 480)
{
vcqi.BitRate = 300000;
}
else
{
vcqi.BitRate = 1000000;
}
// Set the Video Compressor's Quality
vcg.VideoCompressor.QualityInfo = vcqi;
}
private void UpdateVideoSettings()
{
_AMMediaType mt;
object formatBlock;
vc.CaptureGraph.Source.GetMediaType(out mt, out formatBlock);
VIDEOINFOHEADER vih = new VIDEOINFOHEADER();
bool unknownFormat = false;
if (formatBlock is VIDEOINFOHEADER)
{
vih = (VIDEOINFOHEADER)formatBlock;
}
else if (formatBlock is DVINFO)
{
DVCaptureGraph dvcg = vc.CaptureGraph as DVCaptureGraph;
if (dvcg != null)
{
dvcg.GetVideoMediaType(out mt, out formatBlock);
if (formatBlock is VIDEOINFOHEADER)
{
vih = (VIDEOINFOHEADER)formatBlock;
}
else
{
unknownFormat = true;
}
}
else
{
unknownFormat = true;
}
}
else
{
unknownFormat = true;
}
if (unknownFormat)
{
lblCurrentSettings.Text += "Unknown Video Format";
return;
}
BITMAPINFOHEADER bmih = vih.BitmapInfo;
if (lblCurrentSettings.Text == String.Empty)
{
lblCurrentSettings.Text = Strings.VideoStream;
}
else
{
lblCurrentSettings.Text += "\r\n\r\n" + Strings.VideoStream;
}
lblCurrentSettings.Text += string.Format(CultureInfo.CurrentCulture, "\r\n" +
Strings.AdvancedVideoSettingsStatus, TAB, bmih.Width, bmih.Height,
vih.FrameRate.ToString("F2", CultureInfo.InvariantCulture), MediaType.SubType.GuidToString(mt.subtype),
bmih.BitCount, (uint)(bmih.Width * bmih.Height * bmih.BitCount * vih.FrameRate) / 1000);
}