/// <summary>
/// Create a topology to be played with a MediaSession from a filepath.
/// </summary>
internal static Topology CreateTopology(ByteStream mediaInputStream, out MediaSource mediaSource)
{
// collector to dispose all the created Media Foundation native objects.
var collector = new ObjectCollector();
// Get the MediaSource object.
var sourceResolver = new SourceResolver();
collector.Add(sourceResolver);
ComObject mediaSourceObject;
// Try to load music
try
{
mediaSourceObject = sourceResolver.CreateObjectFromStream(mediaInputStream, null, SourceResolverFlags.MediaSource | SourceResolverFlags.ContentDoesNotHaveToMatchExtensionOrMimeType);
}
catch (SharpDXException)
{
collector.Dispose();
throw new InvalidOperationException("Music stream format not supported");
}
Topology retTopo;
try
{
mediaSource = mediaSourceObject.QueryInterface<MediaSource>();
collector.Add(mediaSourceObject);
// Get the PresentationDescriptor
PresentationDescriptor presDesc;
mediaSource.CreatePresentationDescriptor(out presDesc);
collector.Add(presDesc);
// Create the topology
MediaFactory.CreateTopology(out retTopo);
for (var i = 0; i < presDesc.StreamDescriptorCount; i++)
{
Bool selected;
StreamDescriptor desc;
presDesc.GetStreamDescriptorByIndex(i, out selected, out desc);
collector.Add(desc);
if (selected)
{
// Test that the audio file data is valid and supported.
var typeHandler = desc.MediaTypeHandler;
collector.Add(typeHandler);
var majorType = typeHandler.MajorType;
if (majorType != MediaTypeGuids.Audio)
throw new InvalidOperationException("The music stream is not a valid audio stream.");
for (int mType = 0; mType < typeHandler.MediaTypeCount; mType++)
{
MediaType type;
typeHandler.GetMediaTypeByIndex(mType, out type);
collector.Add(type);
var nbChannels = type.Get(MediaTypeAttributeKeys.AudioNumChannels);
if (nbChannels > 2)
throw new InvalidOperationException("The provided audio stream has more than 2 channels.");
}
// create the topology (source,...)
TopologyNode sourceNode;
MediaFactory.CreateTopologyNode(TopologyType.SourceStreamNode, out sourceNode);
collector.Add(sourceNode);
sourceNode.Set(TopologyNodeAttributeKeys.Source, mediaSource);
sourceNode.Set(TopologyNodeAttributeKeys.PresentationDescriptor, presDesc);
sourceNode.Set(TopologyNodeAttributeKeys.StreamDescriptor, desc);
TopologyNode outputNode;
MediaFactory.CreateTopologyNode(TopologyType.OutputNode, out outputNode);
collector.Add(outputNode);
Activate activate;
MediaFactory.CreateAudioRendererActivate(out activate);
collector.Add(activate);
outputNode.Object = activate;
retTopo.AddNode(sourceNode);
retTopo.AddNode(outputNode);
sourceNode.ConnectOutput(0, outputNode, 0);
}
}
}
finally
{
collector.Dispose();
}
return retTopo;
}
/// <summary>
/// Create a topology to be played with a MediaSession from a filepath.
/// </summary>
internal static Topology CreateTopology(ByteStream mediaInputStream, out MediaSource mediaSource)
{
// collector to dispose all the created Media Foundation native objects.
var collector = new ObjectCollector();
// Get the MediaSource object.
var sourceResolver = new SourceResolver();
collector.Add(sourceResolver);
ComObject mediaSourceObject;
// Try to load music
try
{
mediaSourceObject = sourceResolver.CreateObjectFromStream(mediaInputStream, null, SourceResolverFlags.MediaSource | SourceResolverFlags.ContentDoesNotHaveToMatchExtensionOrMimeType);
}
catch (SharpDXException)
{
collector.Dispose();
throw new InvalidOperationException("Music stream format not supported");
}
Topology retTopo;
try
{
mediaSource = mediaSourceObject.QueryInterface <MediaSource>();
collector.Add(mediaSourceObject);
// Get the PresentationDescriptor
PresentationDescriptor presDesc;
mediaSource.CreatePresentationDescriptor(out presDesc);
collector.Add(presDesc);
// Create the topology
MediaFactory.CreateTopology(out retTopo);
for (var i = 0; i < presDesc.StreamDescriptorCount; i++)
{
RawBool selected;
StreamDescriptor desc;
presDesc.GetStreamDescriptorByIndex(i, out selected, out desc);
collector.Add(desc);
if (selected)
{
// Test that the audio file data is valid and supported.
var typeHandler = desc.MediaTypeHandler;
collector.Add(typeHandler);
var majorType = typeHandler.MajorType;
if (majorType != MediaTypeGuids.Audio)
{
throw new InvalidOperationException("The music stream is not a valid audio stream.");
}
for (int mType = 0; mType < typeHandler.MediaTypeCount; mType++)
{
MediaType type;
typeHandler.GetMediaTypeByIndex(mType, out type);
collector.Add(type);
var nbChannels = type.Get(MediaTypeAttributeKeys.AudioNumChannels);
if (nbChannels > 2)
{
throw new InvalidOperationException("The provided audio stream has more than 2 channels.");
}
}
// create the topology (source,...)
TopologyNode sourceNode;
MediaFactory.CreateTopologyNode(TopologyType.SourceStreamNode, out sourceNode);
collector.Add(sourceNode);
sourceNode.Set(TopologyNodeAttributeKeys.Source, mediaSource);
sourceNode.Set(TopologyNodeAttributeKeys.PresentationDescriptor, presDesc);
sourceNode.Set(TopologyNodeAttributeKeys.StreamDescriptor, desc);
TopologyNode outputNode;
MediaFactory.CreateTopologyNode(TopologyType.OutputNode, out outputNode);
collector.Add(outputNode);
Activate activate;
MediaFactory.CreateAudioRendererActivate(out activate);
collector.Add(activate);
outputNode.Object = activate;
retTopo.AddNode(sourceNode);
retTopo.AddNode(outputNode);
sourceNode.ConnectOutput(0, outputNode, 0);
}
}
}
finally
{
collector.Dispose();
}
return(retTopo);
}
