/// <summary>
/// Gets the major media type of a IMFMediaType as a text string
///
/// Adapted from
/// https://msdn.microsoft.com/en-us/library/windows/desktop/ee663602(v=vs.85).aspx
/// </summary>
/// <returns>S_OK for success, nz for fail</returns>
/// <param name="mediaTypeObj">the media type object</param>
/// <param name="outSb">The output string</param>
public static HResult GetMediaMajorTypeAsText(IMFMediaType mediaTypeObj, out StringBuilder outSb)
{
// we always return something here
outSb = new StringBuilder();
// sanity check
if (mediaTypeObj == null)
{
return(HResult.E_FAIL);
}
// MF_MT_MAJOR_TYPE
// Major type GUID, we return this as human readable text
HResult hr = mediaTypeObj.GetMajorType(out Guid majorType);
if (hr == HResult.S_OK)
{
// only report success
outSb.Append("MF_MT_MAJOR_TYPE=" + WMFUtils.ConvertGuidToName(majorType));
}
return(HResult.S_OK);
}
/// <summary>
/// Gets the major media type of a IMFMediaType as a text string
///
/// Adapted from
/// https://msdn.microsoft.com/en-us/library/windows/desktop/ee663602(v=vs.85).aspx
/// </summary>
/// <returns>S_OK for success, nz for fail</returns>
/// <param name="mediaTypeObj">the media type object</param>
/// <param name="outSb">The output string</param>
public static HResult GetMediaSubTypeAsText(IMFMediaType mediaTypeObj, out StringBuilder outSb)
{
// we always return something here
outSb = new StringBuilder();
// sanity check
if (mediaTypeObj == null)
{
return(HResult.E_FAIL);
}
// MF_MT_SUBTYPE
// Subtype GUID which describes the basic media type, we return this as human readable text
HResult hr = mediaTypeObj.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid subType);
if (hr == HResult.S_OK)
{
// only report success
outSb.Append("MF_MT_SUBTYPE=" + WMFUtils.ConvertGuidToName(subType));
}
return(HResult.S_OK);
}
public override void StartStream()
{
Task.Run(() =>
{
// check our source filename is correct and usable
StreamReaderHandler = new StreamHandler(ProcessFrame, MFBPressed);
HResult hr;
IMFSourceResolver pSourceResolver = null;
IMFPresentationDescriptor sourcePresentationDescriptor = null;
IMFStreamDescriptor videoStreamDescriptor = null;
try
{
// reset everything
CloseAllMediaDevices();
// Create the media session.
hr = MFExtern.MFCreateMediaSession(null, out mediaSession);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to MFExtern.MFCreateMediaSession failed. Err=" + hr.ToString());
}
// set up our media session call back handler.
mediaSessionAsyncCallbackHandler = new AsyncCallbackHandler();
mediaSessionAsyncCallbackHandler.Initialize();
mediaSessionAsyncCallbackHandler.MediaSession = mediaSession;
mediaSessionAsyncCallbackHandler.MediaSessionAsyncCallBackError = HandleMediaSessionAsyncCallBackErrors;
mediaSessionAsyncCallbackHandler.MediaSessionAsyncCallBackEvent = HandleMediaSessionAsyncCallBackEvent;
// Register the callback handler with the session and tell it that events can
// start. This does not actually trigger an event it just lets the media session
// know that it can now send them if it wishes to do so.
hr = mediaSession.BeginGetEvent(mediaSessionAsyncCallbackHandler, null);
if (hr != HResult.S_OK)
{
throw new Exception("PrepareSessionAndTopology call to mediaSession.BeginGetEvent failed. Err=" + hr.ToString());
}
StreamReader = WMFUtils.CreateSourceReaderAsyncFromDevice(UnderlyingDevice, StreamReaderHandler);
try
{
SetCurrentMediaType(StreamReader, IMFStreamIndex, 0);
}
catch
{
}
try
{
SetCurrentMediaType(StreamReader, IMFSnapIndex, 1);
}
catch
{
}
StreamReaderHandler.StreamReader = StreamReader;
StreamReader.GetCurrentMediaType(1, out IMFMediaType ppMediaType);
StreamReader.GetNativeMediaType(1, 0, out IMFMediaType PPMediaType);
StreamReader.GetCurrentMediaType(0, out IMFMediaType ppMediaType1);
StreamReader.GetNativeMediaType(0, 0, out IMFMediaType PPMediaType1);
ppMediaType.GetMajorType(out Guid ppMediaTypeMGUID);
PPMediaType.GetMajorType(out Guid PPMediaTypeMGUID);
ppMediaType.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid ppMediaTypeSGUID);
PPMediaType.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid PPMediaTypeSGUID);
Console.WriteLine(WMFUtils.ConvertGuidToName(ppMediaTypeMGUID));
Console.WriteLine(WMFUtils.ConvertGuidToName(PPMediaTypeMGUID));
Console.WriteLine(WMFUtils.ConvertGuidToName(ppMediaTypeSGUID));
Console.WriteLine(WMFUtils.ConvertGuidToName(PPMediaTypeSGUID));
ppMediaType1.GetMajorType(out Guid ppMediaTypeMGUID1);
PPMediaType1.GetMajorType(out Guid PPMediaTypeMGUID1);
ppMediaType1.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid ppMediaTypeSGUID1);
PPMediaType1.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid PPMediaTypeSGUID1);
Console.WriteLine(WMFUtils.ConvertGuidToName(ppMediaTypeMGUID1));
Console.WriteLine(WMFUtils.ConvertGuidToName(PPMediaTypeMGUID1));
Console.WriteLine(WMFUtils.ConvertGuidToName(ppMediaTypeSGUID1));
Console.WriteLine(WMFUtils.ConvertGuidToName(PPMediaTypeSGUID1));
Paused = false;
StreamReader.SetStreamSelection(0, true);
StreamReader.SetStreamSelection(1, true);
hr = StreamReader.ReadSample(
0,
MediaFoundation.ReadWrite.MF_SOURCE_READER_CONTROL_FLAG.None,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero
);
hr = StreamReader.ReadSample(1,
MediaFoundation.ReadWrite.MF_SOURCE_READER_CONTROL_FLAG.None,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero
);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("Failed on calling the first ReadSample on the reader, retVal=" + hr.ToString());
}
}
catch (Exception ex)
{
Console.WriteLine("PrepareSessionAndTopology Error: " + ex.Message);
}
finally
{
// Clean up
if (pSourceResolver != null)
{
Marshal.ReleaseComObject(pSourceResolver);
}
if (sourcePresentationDescriptor != null)
{
Marshal.ReleaseComObject(sourcePresentationDescriptor);
}
if (videoStreamDescriptor != null)
{
Marshal.ReleaseComObject(videoStreamDescriptor);
}
}
});
}
/// <summary>
/// Gets a list of all supported video formats from a media type
/// as a nice displayable bit of text. outSb will never be null can be
/// empty.
///
/// Adapted from
/// https://msdn.microsoft.com/en-us/library/windows/desktop/ee663602(v=vs.85).aspx
/// </summary>
/// <returns>S_OK for success, nz for fail</returns>
/// <param name="mediaTypeObj">the media type object</param>
/// <param name="outSb">The output string</param>
public static HResult GetSupportedFormatsFromMediaTypeAsText(IMFMediaType mediaTypeObj, out StringBuilder outSb)
{
// we always return something here
outSb = new StringBuilder();
// sanity check
if (mediaTypeObj == null)
{
return(HResult.E_FAIL);
}
// Retrieves the number of attributes that are set on this object.
HResult hr = mediaTypeObj.GetCount(out int attributeCount);
if (hr != HResult.S_OK)
{
// if we failed here, bail out
outSb.Append("failed getting attributeCount, retVal=" + hr.ToString());
outSb.Append("\r\n");
return(HResult.E_FAIL);
}
// MF_MT_MAJOR_TYPE
// Major type GUID, we return this as human readable text
hr = mediaTypeObj.GetMajorType(out Guid majorType);
if (hr == HResult.S_OK)
{
// only report success
outSb.Append("MF_MT_MAJOR_TYPE=" + WMFUtils.ConvertGuidToName(majorType) + ", ");
}
// MF_MT_SUBTYPE
// Subtype GUID which describes the basic media type, we return this as human readable text
hr = mediaTypeObj.GetGUID(MFAttributesClsid.MF_MT_SUBTYPE, out Guid subType);
if (hr == HResult.S_OK)
{
// only report success
outSb.Append("MF_MT_SUBTYPE=" + WMFUtils.ConvertGuidToName(subType) + ", ");
}
// MF_MT_FRAME_SIZE
// the Width and height of a video frame, in pixels
hr = MFExtern.MFGetAttributeSize(mediaTypeObj, MFAttributesClsid.MF_MT_FRAME_SIZE, out int frameSizeWidth, out int frameSizeHeight);
if (hr == HResult.S_OK)
{
// only report success
outSb.Append("MF_MT_FRAME_SIZE (W,H)=(" + frameSizeWidth.ToString() + "," + frameSizeHeight.ToString() + "), ");
}
// MF_MT_FRAME_RATE
// The frame rate is expressed as a ratio.The upper 32 bits of the attribute value contain the numerator and the lower 32 bits contain the denominator.
// For example, if the frame rate is 30 frames per second(fps), the ratio is 30 / 1.If the frame rate is 29.97 fps, the ratio is 30,000 / 1001.
// we report this back to the user as a decimal
hr = MFExtern.MFGetAttributeRatio(mediaTypeObj, MFAttributesClsid.MF_MT_FRAME_RATE, out int frameRate, out int frameRateDenominator);
if (hr == HResult.S_OK)
{
// only report success
if (frameRateDenominator < 0)
{
outSb.Append("MF_MT_FRAME_RATE (frames/s)=(undefined),");
}
else
{
outSb.Append("MF_MT_FRAME_RATE=" + ((decimal)frameRate / (decimal)frameRateDenominator).ToString() + "f/s, ");
}
}
// MF_MT_FRAME_RATE_RANGE_MIN
// The frame rate is expressed as a ratio.The upper 32 bits of the attribute value contain the numerator and the lower 32 bits contain the denominator.
// For example, if the frame rate is 30 frames per second(fps), the ratio is 30 / 1.If the frame rate is 29.97 fps, the ratio is 30,000 / 1001.
// we report this back to the user as a decimal
hr = MFExtern.MFGetAttributeRatio(mediaTypeObj, MFAttributesClsid.MF_MT_FRAME_RATE_RANGE_MIN, out int frameRateMin, out int frameRateMinDenominator);
if (hr == HResult.S_OK)
{
// only report success
if (frameRateMinDenominator < 0)
{
outSb.Append("MF_MT_FRAME_RATE_RANGE_MIN (frames/s)=(undefined),");
}
else
{
outSb.Append("MF_MT_FRAME_RATE_RANGE_MIN=" + ((decimal)frameRateMin / (decimal)frameRateMinDenominator).ToString() + "f/s, ");
}
}
// MF_MT_FRAME_RATE_RANGE_MAX
// The frame rate is expressed as a ratio.The upper 32 bits of the attribute value contain the numerator and the lower 32 bits contain the denominator.
// For example, if the frame rate is 30 frames per second(fps), the ratio is 30 / 1.If the frame rate is 29.97 fps, the ratio is 30,000 / 1001.
// we report this back to the user as a decimal
hr = MFExtern.MFGetAttributeRatio(mediaTypeObj, MFAttributesClsid.MF_MT_FRAME_RATE_RANGE_MAX, out int frameRateMax, out int frameRateMaxDenominator);
if (hr == HResult.S_OK)
{
// only report success
if (frameRateMaxDenominator < 0)
{
outSb.Append("MF_MT_FRAME_RATE_RANGE_MAX (frames/s)=(undefined),");
}
else
{
outSb.Append("MF_MT_FRAME_RATE_RANGE_MAX=" + ((decimal)frameRateMax / (decimal)frameRateMaxDenominator).ToString() + "f/s, ");
}
}
// enumerate all of the possible Attributes so we can see which ones are present that we did not report on
hr = EnumerateAllAttributeNamesInMediaTypeAsText(mediaTypeObj, attributeCount, out StringBuilder allAttrs);
if (hr == HResult.S_OK)
{
outSb.Append("\r\n");
outSb.Append(" AllAttrs=" + allAttrs.ToString());
}
return(HResult.S_OK);
}
