public static uint GetUInt32(this IMFAttributes obj, Guid key, uint defaultValue = 0)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (obj.GetUINT32(key, out var value).IsError)
{
return(defaultValue);
}
return(value);
}
public static int GetInt32(this IMFAttributes input, Guid key, int defaultValue = 0)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (input.GetUINT32(key, out var value).IsError)
{
return(defaultValue);
}
return((int)value);
}
public static bool GetBoolean(this IMFAttributes obj, Guid key, bool defaultValue = false)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (obj.GetUINT32(key, out var value).IsError)
{
return(defaultValue);
}
return(value != 0);
}
/// <summary>
/// Retrieves a UInt32 value associated with a key.
/// </summary>
/// <param name="attributes">A valid IMFAttributes instance.</param>
/// <param name="guidKey">Guid that identifies which value to retrieve.</param>
/// <param name="value">Receives the requested value.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult GetUINT32(this IMFAttributes attributes, Guid guidKey, out uint value)
{
if (attributes == null)
{
throw new ArgumentNullException("attributes");
}
int result = 0;
HResult hr = attributes.GetUINT32(guidKey, out result);
value = hr.Succeeded() ? (uint)result : default(uint);
return(hr);
}
/// <summary>
/// Retrieves a Boolean value associated with a key.
/// </summary>
/// <param name="attributes">A valid IMFAttributes instance.</param>
/// <param name="guidKey">Guid that identifies which value to retrieve.</param>
/// <param name="value">Receives the requested value.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
/// <remarks>Media Foundation attributes don't support boolean values. This method get them as a 32-bits unsigned integer and return true for any non-zero value and false otherwise.</remarks>
public static HResult GetBoolean(this IMFAttributes attributes, Guid guidKey, out bool value)
{
if (attributes == null)
{
throw new ArgumentNullException("attributes");
}
uint result;
HResult hr = attributes.GetUINT32(guidKey, out result);
value = hr.Succeeded() ? (result != 0) : default(bool);
return(hr);
}
private static IMFAttributes CreateAudioAttributes(AudioFormat audioOutput)
{
uint codecConfig = 0;
object supportedAttributes = null;
// Create the audio attributes
IMFAttributes audioAttributes = null;
// Generate the audio media type
uint elementsNumber = 0;
uint selectedType = 0;
int avgBitrateDiff = int.MaxValue;
uint avgBytePerSecond = uint.MaxValue;
// Get the available audio ouput types for the required sub type
IMFCollection availableTypes = null;
MFHelper.MFTranscodeGetAudioOutputAvailableTypes(audioOutput.Subtype, (uint)Enums.MFT_ENUM_FLAG.MFT_ENUM_FLAG_ALL, codecConfig, out availableTypes);
// Get the number of types
availableTypes.GetElementCount(out elementsNumber);
// Find the best match for our needs
for (uint elementIndex = 0; elementIndex < elementsNumber; elementIndex++)
{
// Get the next element
availableTypes.GetElement(elementIndex, out supportedAttributes);
audioAttributes = (IMFAttributes)supportedAttributes;
// Get the byte per second
audioAttributes.GetUINT32(new Guid(Consts.MF_MT_AUDIO_AVG_BYTES_PER_SECOND), out avgBytePerSecond);
// If this is better than the last one found remember the index
if (Math.Abs((int)avgBytePerSecond - (int)audioOutput.AvgBytePerSecond) < avgBitrateDiff)
{
selectedType = elementIndex;
avgBitrateDiff = Math.Abs((int)avgBytePerSecond - (int)audioOutput.AvgBytePerSecond);
}
audioAttributes = null;
}
// Get the best audio type found
availableTypes.GetElement(selectedType, out supportedAttributes);
audioAttributes = (IMFAttributes)supportedAttributes;
return(audioAttributes);
}
MFGetAttributeUINT32(
IMFAttributes pAttributes,
Guid guidKey,
int unDefault
)
{
HResult hr;
int unRet;
try
{
hr = pAttributes.GetUINT32(guidKey, out unRet);
MFError.ThrowExceptionForHR(hr);
}
catch
{
unRet = unDefault;
}
return(unRet);
}
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
switch (e.KeyChar)
{
// Space key toggles between running and paused
case ' ':
e.Handled = true;
if (g_pPlayer.GetState() == CPlayer.PlayerState.Started)
{
g_pPlayer.Pause();
}
else if (g_pPlayer.GetState() == CPlayer.PlayerState.Paused)
{
g_pPlayer.Play();
}
break;
case 'r':
e.Handled = true;
if (rotateAsyncToolStripMenuItem.Checked)
{
IMFAttributes ia = g_pPlayer.GetVideoAttributes();
if (ia != null)
{
Guid ClsidRotate = new Guid("AC776FB5-858F-4891-A5DC-FD01E79B5AD6");
int i;
HResult hr;
hr = ia.GetUINT32(ClsidRotate, out i);
if (hr >= 0)
{
i = i < 7 ? i + 1 : 0;
hr = ia.SetUINT32(ClsidRotate, i);
}
System.Runtime.InteropServices.Marshal.ReleaseComObject(ia);
}
}
break;
}
}
public static int MFGetAttributeUINT32(
IMFAttributes pAttributes,
Guid guidKey,
int unDefault
)
{
int hr;
int unRet;
try
{
hr = pAttributes.GetUINT32(guidKey, out unRet);
MFError.ThrowExceptionForHR(hr);
}
catch
{
unRet = unDefault;
}
return unRet;
}
public HResult GetUINT32(Guid guidKey, out int punValue)
{
return(m_Attribs.GetUINT32(guidKey, out punValue));
}