/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Does everything to copy a file. Opens the Source Reader and Sink Writer
/// configures the streams and then, because a Synchronous version
/// of the Source Reader is used, we sit in a loop and perform the copy.
///
/// Any errors here simply throw an exception and must be trapped elsewhere
///
/// Note that because this code is intended for demo purposes, it has been
/// kept very simple and linear. Most of the things that could have been
/// refactored in a common procedure (audio and video streams) are simply
/// written out in duplicate in order to make it obvious what is going on.
/// </summary>
/// <param name="sourceFileName">the source file name</param>
/// <param name="outputFileName">the name of the output file</param>
/// <history>
/// 01 Nov 18 Cynic - Originally Written
/// </history>
public void CopyFile(string sourceFileName, string outputFileName)
{
HResult hr;
int sinkWriterOutputVideoStreamId = -1;
int videoSamplesProcessed = 0;
bool videoStreamIsAtEOS = false;
int sourceReaderVideoStreamId = -1;
int sinkWriterOutputAudioStreamId = -1;
int audioSamplesProcessed = 0;
bool audioStreamIsAtEOS = false;
int sourceReaderAudioStreamId = -1;
// not keen on endless loops. This is the maximum number
// of streams we will check in the source reader.
const int MAX_SOURCEREADER_STREAMS = 100;
// create the SourceReader
sourceReader = TantaWMFUtils.CreateSourceReaderSyncFromFile(sourceFileName, DEFAULT_ALLOW_HARDWARE_TRANSFORMS);
if (sourceReader == null)
{
// we failed
throw new Exception("CopyFile: Failed to create SourceReader, Nothing will work.");
}
// create the SinkWriter
sinkWriter = TantaWMFUtils.CreateSinkWriterFromFile(outputFileName, DEFAULT_ALLOW_HARDWARE_TRANSFORMS);
if (sinkWriter == null)
{
// we failed
throw new Exception("CopyFile: Failed to create Sink Writer, Nothing will work.");
}
// find the first audio and video stream and identify the default Media Type
// they are using. We could look into the streams and enumerate all of the
// types on offer and choose one from the list - but for a copy operation
// the default will be quite suitable.
sourceReaderNativeVideoMediaType = null;
sourceReaderNativeAudioMediaType = null;
for (int streamIndex = 0; streamIndex < MAX_SOURCEREADER_STREAMS; streamIndex++)
{
IMFMediaType workingType = null;
Guid guidMajorType = Guid.Empty;
// if we have found both the video and audio types (and their stream ids) leave now
if ((sourceReaderNativeVideoMediaType != null) && (sourceReaderNativeAudioMediaType != null))
{
break;
}
hr = sourceReader.GetNativeMediaType(streamIndex, 0, out workingType);
if (hr == HResult.MF_E_NO_MORE_TYPES)
{
break;
}
if (hr == HResult.MF_E_INVALIDSTREAMNUMBER)
{
break;
}
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: failed on call to GetNativeMediaType, retVal=" + hr.ToString());
}
if (workingType == null)
{
// we failed
throw new Exception("CopyFile: failed on call to GetNativeMediaType, workingType == null");
}
// what major type does this stream have?
hr = workingType.GetMajorType(out guidMajorType);
if (hr != HResult.S_OK)
{
throw new Exception("CopyFile: call to workingType.GetMajorType failed. Err=" + hr.ToString());
}
if (guidMajorType == null)
{
throw new Exception("CopyFile: call to workingType.GetMajorType failed. guidMajorType == null");
}
// test for video or audio (there can be others)
if ((guidMajorType == MFMediaType.Video) && (sourceReaderNativeVideoMediaType == null))
{
// this stream represents a video type
sourceReaderNativeVideoMediaType = workingType;
sourceReaderVideoStreamId = streamIndex;
// the sourceReaderNativeVideoMediaType will be released elsewhere
continue;
}
else if ((guidMajorType == MFMediaType.Audio) && (sourceReaderNativeAudioMediaType == null))
{
// this stream represents a audio type
sourceReaderNativeAudioMediaType = workingType;
sourceReaderAudioStreamId = streamIndex;
// the sourceReaderNativeAudioMediaType will be released elsewhere
continue;
}
// if we get here release the type - we do not use it
if (workingType != null)
{
Marshal.ReleaseComObject(workingType);
workingType = null;
}
}
// at this point we expect we can have a native video or a native audio media type
// or both, but not neither. if we don't we cannot carry on
if ((sourceReaderNativeVideoMediaType == null) && (sourceReaderNativeAudioMediaType == null))
{
// we failed
throw new Exception("CopyFile: failed on call to GetNativeMediaType, sourceReaderNativeVideoMediaType == null");
}
// if we have a video stream in the source file we now set it up
if (sourceReaderNativeVideoMediaType != null)
{
// set the media type on the reader - this is the media type it will output
hr = sourceReader.SetCurrentMediaType(sourceReaderVideoStreamId, null, sourceReaderNativeVideoMediaType);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: failed on call to SetCurrentMediaType(v), retVal=" + hr.ToString());
}
// add a stream to the sink writer. The mediaType specifies the format of the samples that will be written
// to the file. Note that it does not necessarily need to match the input format. To set the input format
// use SetInputMediaType. In this case it does match because we copied the video encoder information directly
// out of the video source type
hr = sinkWriter.AddStream(sourceReaderNativeVideoMediaType, out sinkWriterOutputVideoStreamId);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed adding the output stream(v), retVal=" + hr.ToString());
}
// Set the input format for a stream on the sink writer. Note the use of the stream index here
// The input format does not have to match the target format that is written to the media sink
// If the formats do not match, this call attempts to load an transform
// that can convert from the input format to the target format. If it cannot find one, and this is not
// a sure thing, it will throw an exception.
hr = sinkWriter.SetInputMediaType(sinkWriterOutputVideoStreamId, sourceReaderNativeVideoMediaType, null);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling SetInputMediaType(v) on the writer, retVal=" + hr.ToString());
}
}
// if we have an audio stream in the source file we now set it up
if (sourceReaderNativeAudioMediaType != null)
{
// set the media type on the reader - this is the media type it will output
hr = sourceReader.SetCurrentMediaType(sourceReaderAudioStreamId, null, sourceReaderNativeAudioMediaType);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: failed on call to SetCurrentMediaType(a), retVal=" + hr.ToString());
}
// add a stream to the sink writer. The mediaType specifies the format of the samples that will be written
// to the file. Note that it does not necessarily need to match the input format. To set the input format
// use SetInputMediaType. In this case it does match because we copied the video encoder information directly
// out of the video source type
hr = sinkWriter.AddStream(sourceReaderNativeAudioMediaType, out sinkWriterOutputAudioStreamId);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed adding the output stream(a), retVal=" + hr.ToString());
}
// Set the input format for a stream on the sink writer. Note the use of the stream index here
// The input format does not have to match the target format that is written to the media sink
// If the formats do not match, this call attempts to load an transform
// that can convert from the input format to the target format. If it cannot find one, and this is not
// a sure thing, it will throw an exception.
hr = sinkWriter.SetInputMediaType(sinkWriterOutputAudioStreamId, sourceReaderNativeAudioMediaType, null);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling SetInputMediaType(a) on the writer, retVal=" + hr.ToString());
}
}
// begin writing on the sink writer
hr = sinkWriter.BeginWriting();
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: failed on call to BeginWriting, retVal=" + hr.ToString());
}
// we sit in a loop here and get the sample from the source reader and write it out
// to the sink writer. An EOS (end of sample) value in the flags will signal the end.
while (true)
{
int actualStreamIndex;
MF_SOURCE_READER_FLAG actualStreamFlags;
long timeStamp = 0;
IMFSample workingMediaSample = null;
// Request the next sample from the media source. Note that this could be
// any type of media sample (video, audio, subtitles etc). We do not know
// until we look at the stream ID. We saved the stream ID earlier when
// we obtained the media types and so we can branch based on that.
hr = sourceReader.ReadSample(
TantaWMFUtils.MF_SOURCE_READER_ANY_STREAM,
0,
out actualStreamIndex,
out actualStreamFlags,
out timeStamp,
out workingMediaSample
);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling the ReadSample on the reader, retVal=" + hr.ToString());
}
// the sample may be null if either end of stream or a stream tick is returned
if (workingMediaSample == null)
{
// just ignore, the flags will have the information we need.
}
else
{
// the sample is not null
if (actualStreamIndex == sourceReaderAudioStreamId)
{
// audio data
// ensure discontinuity is set for the first sample in each stream
if (audioSamplesProcessed == 0)
{
// audio data
hr = workingMediaSample.SetUINT32(MFAttributesClsid.MFSampleExtension_Discontinuity, 1);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling SetUINT32 on the sample, retVal=" + hr.ToString());
}
// remember this - we only do it once
audioSamplesProcessed++;
}
hr = sinkWriter.WriteSample(sinkWriterOutputAudioStreamId, workingMediaSample);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling the WriteSample on the writer, retVal=" + hr.ToString());
}
}
else if (actualStreamIndex == sourceReaderVideoStreamId)
{
// video data
// ensure discontinuity is set for the first sample in each stream
if (videoSamplesProcessed == 0)
{
// video data
hr = workingMediaSample.SetUINT32(MFAttributesClsid.MFSampleExtension_Discontinuity, 1);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling SetUINT32 on the sample, retVal=" + hr.ToString());
}
// remember this - we only do it once
videoSamplesProcessed++;
}
hr = sinkWriter.WriteSample(sinkWriterOutputVideoStreamId, workingMediaSample);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling the WriteSample on the writer, retVal=" + hr.ToString());
}
}
// release the sample
if (workingMediaSample != null)
{
Marshal.ReleaseComObject(workingMediaSample);
workingMediaSample = null;
}
}
// do we have a stream tick event?
if ((actualStreamFlags & MF_SOURCE_READER_FLAG.StreamTick) != 0)
{
if (actualStreamIndex == sourceReaderVideoStreamId)
{
// video stream
hr = sinkWriter.SendStreamTick(sinkWriterOutputVideoStreamId, timeStamp);
}
else if (actualStreamIndex == sourceReaderAudioStreamId)
{
// audio stream
hr = sinkWriter.SendStreamTick(sinkWriterOutputAudioStreamId, timeStamp);
}
else
{
}
}
// is this stream at an END of Segment
if ((actualStreamFlags & MF_SOURCE_READER_FLAG.EndOfStream) != 0)
{
// We have an EOS - but is it on the video or audio channel?
// we have to get it on both
if (actualStreamIndex == sourceReaderVideoStreamId)
{
// video stream
// have we seen this before?
if (videoStreamIsAtEOS == false)
{
hr = sinkWriter.NotifyEndOfSegment(sinkWriterOutputVideoStreamId);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling the NotifyEndOfSegment on video stream, retVal=" + hr.ToString());
}
videoStreamIsAtEOS = true;
}
}
else if (actualStreamIndex == sourceReaderAudioStreamId)
{
// audio stream
// have we seen this before?
if (audioStreamIsAtEOS == false)
{
hr = sinkWriter.NotifyEndOfSegment(sinkWriterOutputAudioStreamId);
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("CopyFile: Failed on calling the NotifyEndOfSegment on audio stream, retVal=" + hr.ToString());
}
audioStreamIsAtEOS = true;
}
// audio stream
}
else
{
}
// our exit condition depends on which streams are in use
if ((sourceReaderNativeVideoMediaType != null) && (sourceReaderNativeAudioMediaType != null))
{
// if both streams are at EOS we can leave
if ((videoStreamIsAtEOS == true) && (audioStreamIsAtEOS == true))
{
break;
}
}
else if (sourceReaderNativeVideoMediaType != null)
{
// only video is active, if the video stream is EOS we can leave
if (videoStreamIsAtEOS == true)
{
break;
}
}
else if (sourceReaderNativeAudioMediaType != null)
{
// only audio is active, if the audio stream is EOS we can leave
if (audioStreamIsAtEOS == true)
{
break;
}
}
}
} // bottom of endless for loop
hr = sinkWriter.Finalize_();
if (hr != HResult.S_OK)
{
// we failed
throw new Exception("Failed on call tosinkWriter.Finalize(), retVal=" + hr.ToString());
}
}