private void FillAudioProperty(AudioInfo info, MediaFoundation.Misc.PropertyKey key, PropVariant pv)
{
if (key.IsEqual(SystemProperties.System.Audio.ChannelCount))
{
info.ChannelCount = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Audio.EncodingBitrate))
{
info.EncodingBitrate = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Audio.SampleRate))
{
info.SampleRate = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Audio.Format))
{
info.Format = (string)pv;
}
if (key.IsEqual(SystemProperties.System.Audio.StreamNumber))
{
info.StreamNumber = (uint)pv;
}
}
void TestSetValue()
{
PropVariant var = new PropVariant("asdf");
PropertyKey key = new PropertyKey();
key.fmtid = Guid.NewGuid();
key.pID = 3;
int hr = m_ps.SetValue(key, var);
MFError.ThrowExceptionForHR(hr);
}
private static void FillVideoProperty(VideoInfo info, MediaFoundation.Misc.PropertyKey key, PropVariant pv)
{
if (key.IsEqual(SystemProperties.System.Video.Compression))
{
info.Compression = (string)pv;
}
if (key.IsEqual(SystemProperties.System.Video.Director))
{
info.Director = (string)pv;
}
if (key.IsEqual(SystemProperties.System.Video.EncodingBitrate))
{
info.EncodingBitrate = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.FrameHeight))
{
info.FrameHeight = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.FrameWidth))
{
info.FrameWidth = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.FrameRate))
{
info.FrameRate = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.HorizontalAspectRatio))
{
info.HorizontalAspectRatio = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.VerticalAspectRatio))
{
info.VerticalAspectRatio = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.TotalBitrate))
{
info.TotalBitrate = (uint)pv;
}
if (key.IsEqual(SystemProperties.System.Video.StreamNumber))
{
info.StreamNumber = (uint)pv;
}
}
void TestGetAt()
{
PropVariant var = new PropVariant();
PropertyKey key = new PropertyKey();
int hr = m_ps.GetAt(0, key);
MFError.ThrowExceptionForHR(hr);
Debug.Assert(key.pID == 3);
hr = m_ps.GetValue(key, var);
MFError.ThrowExceptionForHR(hr);
Debug.Assert(var.GetString() == "asdf");
}
/// <summary>
/// Based on https://docs.microsoft.com/en-us/windows/desktop/medfound/shell-metadata-providers
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void infoToolStripMenuItem_Click(object sender, EventArgs e)
{
IMFSourceResolver pSourceResolver = null;
IMFMediaSource pSource = null;
object pPropsObject = null;
var url = this.listView1.SelectedItems[0].Text;
try
{
// Create the source resolver.
HResult hr = MFExtern.MFCreateSourceResolver(out pSourceResolver);
Validate(hr);
if (pSourceResolver == null)
{
throw new Exception("pSourceResolver is null");
}
// Get a pointer to the IMFMediaSource interface of the media source.
hr = pSourceResolver.CreateObjectFromURL(url, MFResolution.MediaSource, null, out pSource);
Validate(hr);
if (pSource == null)
{
throw new Exception("pSource is null");
}
hr = MFExtern.MFGetService(pSource, MFServices.MF_PROPERTY_HANDLER_SERVICE, typeof(IPropertyStore).GUID, out pPropsObject);
Validate(hr);
if (pPropsObject == null)
{
throw new Exception("pPropsObject is null");
}
IPropertyStore pProps = pPropsObject as IPropertyStore;
hr = pProps.GetCount(out int cProps);
Validate(hr);
var audioInfo = new AudioInfo();
var videoInfo = new VideoInfo();
for (int i = 0; i < cProps; ++i)
{
var key = new MediaFoundation.Misc.PropertyKey();
hr = pProps.GetAt(i, key);
Validate(hr);
using (PropVariant pv = new PropVariant())
{
hr = pProps.GetValue(key, pv);
Validate(hr);
FillAudioProperty(audioInfo, key, pv);
FillVideoProperty(videoInfo, key, pv);
}
}
MessageBox.Show("Audio =\n" + audioInfo + ";\nVideo =\n" + videoInfo);
}
finally
{
if (pSource != null)
{
Marshal.ReleaseComObject(pSource);
}
if (pSourceResolver != null)
{
Marshal.ReleaseComObject(pSourceResolver);
}
if (pPropsObject != null)
{
Marshal.ReleaseComObject(pPropsObject);
}
}
// MessageBox.Show(url);
}
