int ISampleGrabberCB.SampleCB(double sampleTime, IMediaSample pSample)
{
var mediaType = new AMMediaType();
/* We query for the media type the sample grabber is using */
int hr = m_sampleGrabber.GetConnectedMediaType(mediaType);
var videoInfo = new VideoInfoHeader();
/* 'Cast' the pointer to our managed struct */
Marshal.PtrToStructure(mediaType.formatPtr, videoInfo);
/* The stride is "How many bytes across for each pixel line (0 to width)" */
int stride = Math.Abs(videoInfo.BmiHeader.Width * (videoInfo.BmiHeader.BitCount / 8 /* eight bits per byte */));
int width = videoInfo.BmiHeader.Width;
int height = videoInfo.BmiHeader.Height;
if (m_videoFrame == null)
{
InitializeBitmapFrame(width, height);
}
if (m_videoFrame == null)
{
return(0);
}
BitmapData bmpData = m_videoFrame.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite,
PixelFormat.Format24bppRgb);
/* Get the pointer to the pixels */
IntPtr pBmp = bmpData.Scan0;
IntPtr samplePtr;
/* Get the native pointer to the sample */
pSample.GetPointer(out samplePtr);
int pSize = stride * height;
/* Copy the memory from the sample pointer to our bitmap pixel pointer */
CopyMemory(pBmp, samplePtr, pSize);
m_videoFrame.UnlockBits(bmpData);
InvokeNewVideoSample(new VideoSampleArgs {
VideoFrame = m_videoFrame
});
DsUtils.FreeAMMediaType(mediaType);
/* Dereference the sample COM object */
Marshal.ReleaseComObject(pSample);
return(0);
}
/// <summary>
/// Finds a pin that exists in a graph.
/// </summary>
/// <param name="majorOrMinorMediaType">The GUID of the major or minor type of the media</param>
/// <param name="pinDirection">The direction of the pin - in/out</param>
/// <param name="graph">The graph to search in</param>
/// <returns>Returns null if the pin was not found, or if a pin is found, returns the first instance of it</returns>
protected static IPin FindPinInGraphByMediaType(Guid majorOrMinorMediaType, PinDirection pinDirection, IGraphBuilder graph)
{
IEnumFilters enumFilters;
/* Get the filter enum */
graph.EnumFilters(out enumFilters);
/* Init our vars */
var filters = new IBaseFilter[1];
var fetched = IntPtr.Zero;
IPin pin = null;
IEnumMediaTypes mediaTypesEnum = null;
/* Loop over each filter in the graph */
while (enumFilters.Next(1, filters, fetched) == 0)
{
var filter = filters[0];
int i = 0;
/* Loop over each pin in the filter */
while ((pin = DsFindPin.ByDirection(filter, pinDirection, i)) != null)
{
/* Get the pin enumerator */
pin.EnumMediaTypes(out mediaTypesEnum);
var mediaTypesFetched = IntPtr.Zero;
var mediaTypes = new AMMediaType[1];
/* Enumerate the media types on the pin */
while (mediaTypesEnum.Next(1, mediaTypes, mediaTypesFetched) == 0)
{
/* See if the major or subtype meets our requirements */
if (mediaTypes[0].majorType.Equals(majorOrMinorMediaType) || mediaTypes[0].subType.Equals(majorOrMinorMediaType))
{
/* We found a match */
goto done;
}
}
i++;
}
}
done:
if (mediaTypesEnum != null)
{
mediaTypesEnum.Reset();
Marshal.ReleaseComObject(mediaTypesEnum);
}
enumFilters.Reset();
Marshal.ReleaseComObject(enumFilters);
return(pin);
}
private void SetupSampleGrabber(ISampleGrabber sampleGrabber)
{
var mediaType = new AMMediaType
{
majorType = MediaType.Video,
subType = MediaSubType.RGB24,
formatType = FormatType.VideoInfo
};
int hr = sampleGrabber.SetMediaType(mediaType);
DsUtils.FreeAMMediaType(mediaType);
DsError.ThrowExceptionForHR(hr);
hr = sampleGrabber.SetCallback(this, 0);
DsError.ThrowExceptionForHR(hr);
}
/// <summary>
/// Gets the video resolution of a pin on a renderer.
/// </summary>
/// <param name="renderer">The renderer to inspect</param>
/// <param name="direction">The direction the pin is</param>
/// <param name="pinIndex">The zero based index of the pin to inspect</param>
/// <returns>If successful a video resolution is returned. If not, a 0x0 size is returned</returns>
protected static Size GetVideoSize(IBaseFilter renderer, PinDirection direction, int pinIndex)
{
var size = new Size();
var mediaType = new AMMediaType();
IPin pin = DsFindPin.ByDirection(renderer, direction, pinIndex);
if (pin == null)
{
goto done;
}
int hr = pin.ConnectionMediaType(mediaType);
if (hr != 0)
{
goto done;
}
/* Check to see if its a video media type */
if (mediaType.formatType != FormatType.VideoInfo2 &&
mediaType.formatType != FormatType.VideoInfo)
{
goto done;
}
var videoInfo = new VideoInfoHeader();
/* Read the video info header struct from the native pointer */
Marshal.PtrToStructure(mediaType.formatPtr, videoInfo);
Rectangle rect = videoInfo.SrcRect.ToRectangle();
size = new Size(rect.Width, rect.Height);
done:
DsUtils.FreeAMMediaType(mediaType);
if (pin != null)
{
Marshal.ReleaseComObject(pin);
}
return(size);
}
/// <summary>
/// Gets the video resolution of a pin on a renderer.
/// </summary>
/// <param name="renderer">The renderer to inspect</param>
/// <param name="direction">The direction the pin is</param>
/// <param name="pinIndex">The zero based index of the pin to inspect</param>
/// <returns>If successful a video resolution is returned. If not, a 0x0 size is returned</returns>
protected static Size GetVideoSize(IBaseFilter renderer, PinDirection direction, int pinIndex)
{
var size = new Size();
var mediaType = new AMMediaType();
IPin pin = DsFindPin.ByDirection(renderer, direction, pinIndex);
if (pin == null)
goto done;
int hr = pin.ConnectionMediaType(mediaType);
if (hr != 0)
goto done;
/* Check to see if its a video media type */
if (mediaType.formatType != FormatType.VideoInfo2 && mediaType.formatType != FormatType.VideoInfo)
{
goto done;
}
var videoInfo = new VideoInfoHeader();
/* Read the video info header struct from the native pointer */
Marshal.PtrToStructure(mediaType.formatPtr, videoInfo);
Rectangle rect = videoInfo.SrcRect.ToRectangle();
size = new Size(rect.Width, rect.Height);
done:
DsUtils.FreeAMMediaType(mediaType);
return size;
}
/// <summary>
/// Finds a pin that exists in a graph.
/// </summary>
/// <param name="majorOrMinorMediaType">The GUID of the major or minor type of the media</param>
/// <param name="pinDirection">The direction of the pin - in/out</param>
/// <param name="graph">The graph to search in</param>
/// <returns>Returns null if the pin was not found, or if a pin is found, returns the first instance of it</returns>
protected static IPin FindPinInGraphByMediaType(Guid majorOrMinorMediaType, PinDirection pinDirection, IGraphBuilder graph)
{
IEnumFilters enumFilters;
/* Get the filter enum */
graph.EnumFilters(out enumFilters);
/* Init our vars */
var filters = new IBaseFilter[1];
var fetched = IntPtr.Zero;
IPin pin = null;
IEnumMediaTypes mediaTypesEnum = null;
/* Loop over each filter in the graph */
while (enumFilters.Next(1, filters, fetched) == 0)
{
var filter = filters[0];
int i = 0;
/* Loop over each pin in the filter */
while ((pin = DsFindPin.ByDirection(filter, pinDirection, i)) != null)
{
/* Get the pin enumerator */
pin.EnumMediaTypes(out mediaTypesEnum);
var mediaTypesFetched = IntPtr.Zero;
var mediaTypes = new AMMediaType[1];
/* Enumerate the media types on the pin */
while (mediaTypesEnum.Next(1, mediaTypes, mediaTypesFetched) == 0)
{
/* See if the major or subtype meets our requirements */
if (mediaTypes[0].majorType.Equals(majorOrMinorMediaType) || mediaTypes[0].subType.Equals(majorOrMinorMediaType))
{
/* We found a match */
goto done;
}
}
i++;
}
}
done:
if (mediaTypesEnum != null)
{
mediaTypesEnum.Reset();
Marshal.ReleaseComObject(mediaTypesEnum);
}
enumFilters.Reset();
Marshal.ReleaseComObject(enumFilters);
return pin;
}
/// <summary>
/// Sets the number of DVD buttons found in the current DVD video
/// </summary>
/// <param name="buttonCount">The total number of buttons</param>
private void SetDvdButtonCount(int buttonCount)
{
m_dvdButtonCount = buttonCount;
if (m_dvdButtonCount == 0)
{
m_isOverButton = false;
InvokeOnOverDvdButton(m_isOverButton);
}
var mediaType = new AMMediaType();
m_dummyRendererPin.ConnectionMediaType(mediaType);
/* Check to see if its a video media type */
if (mediaType.formatType != FormatType.VideoInfo2 &&
mediaType.formatType != FormatType.VideoInfo)
{
DsUtils.FreeAMMediaType(mediaType);
return;
}
var videoInfo = new VideoInfoHeader();
/* Read the video info header struct from the native pointer */
Marshal.PtrToStructure(mediaType.formatPtr, videoInfo);
/* Get the target rect */
m_renderTargetRect = videoInfo.TargetRect.ToRectangle();
DsUtils.FreeAMMediaType(mediaType);
}
/// <summary>
/// Builds the DVD DirectShow graph
/// </summary>
private void BuildGraph()
{
try
{
FreeResources();
int hr;
/* Create our new graph */
m_graph = (IGraphBuilder)new FilterGraphNoThread();
#if DEBUG
m_rot = new DsROTEntry(m_graph);
#endif
/* We are going to use the VMR9 for now. The EVR does not
* seem to work with the interactive menus yet. It should
* play Dvds fine otherwise */
var rendererType = VideoRendererType.VideoMixingRenderer9;
/* Creates and initializes a new renderer ready to render to WPF */
m_renderer = CreateVideoRenderer(rendererType, m_graph, 2);
/* Do some VMR9 specific stuff */
if (rendererType == VideoRendererType.VideoMixingRenderer9)
{
var mixer = m_renderer as IVMRMixerControl9;
if(mixer != null)
{
VMR9MixerPrefs dwPrefs;
mixer.GetMixingPrefs(out dwPrefs);
dwPrefs &= ~VMR9MixerPrefs.RenderTargetMask;
dwPrefs |= VMR9MixerPrefs.RenderTargetYUV;
/* Enable this line to prefer YUV */
//hr = mixer.SetMixingPrefs(dwPrefs);
}
}
/* Create a new DVD Navigator. */
var dvdNav = (IBaseFilter)new DVDNavigator();
/* The DVDControl2 interface lets us control DVD features */
m_dvdControl = dvdNav as IDvdControl2;
if (m_dvdControl == null)
throw new Exception("Could not QueryInterface the IDvdControl2 interface");
/* QueryInterface the DVDInfo2 */
m_dvdInfo = dvdNav as IDvdInfo2;
/* If a Dvd directory has been set then use it, if not, let DShow find the Dvd */
if (!string.IsNullOrEmpty(DvdDirectory))
{
hr = m_dvdControl.SetDVDDirectory(DvdDirectory);
DsError.ThrowExceptionForHR(hr);
}
/* This gives us the DVD time in Hours-Minutes-Seconds-Frame time format, and other options */
hr = m_dvdControl.SetOption(DvdOptionFlag.HMSFTimeCodeEvents, true);
DsError.ThrowExceptionForHR(hr);
/* If the graph stops, resume at the same point */
m_dvdControl.SetOption(DvdOptionFlag.ResetOnStop, false);
hr = m_graph.AddFilter(dvdNav, "DVD Navigator");
DsError.ThrowExceptionForHR(hr);
IPin dvdVideoPin = null;
IPin dvdAudioPin = null;
IPin dvdSubPicturePin = null;
IPin dvdNavPin;
int i = 0;
/* Loop all the output pins on the DVD Navigator, trying to find which pins are which.
* We could more easily find the pins by name, but this is more fun...and more flexible
* if we ever want to use a 3rd party DVD navigator that used different pin names */
while ((dvdNavPin = DsFindPin.ByDirection(dvdNav, PinDirection.Output, i)) != null)
{
var mediaTypes = new AMMediaType[1];
IntPtr pFetched = IntPtr.Zero;
IEnumMediaTypes mediaTypeEnum;
dvdNavPin.EnumMediaTypes(out mediaTypeEnum);
/* Loop over each of the mediaTypes of each pin */
while (mediaTypeEnum.Next(1, mediaTypes, pFetched) == 0)
{
AMMediaType mediaType = mediaTypes[0];
/* This will be the video stream pin */
if (mediaType.subType == MediaSubType.Mpeg2Video)
{
/* Keep the ref and we'll work with it later */
dvdVideoPin = dvdNavPin;
break;
}
/* This will be the audio stream pin */
if (mediaType.subType == MediaSubType.DolbyAC3 ||
mediaType.subType == MediaSubType.Mpeg2Audio)
{
/* Keep the ref and we'll work with it later */
dvdAudioPin = dvdNavPin;
break;
}
/* This is the Dvd sub picture pin. This generally
* shows overlays for Dvd menus and sometimes closed captions */
if (mediaType.subType == DVD_SUBPICTURE_TYPE)
{
/* Keep the ref and we'll work with it later */
dvdSubPicturePin = dvdNavPin;
break;
}
}
mediaTypeEnum.Reset();
Marshal.ReleaseComObject(mediaTypeEnum);
i++;
}
/* This is the windowed renderer. This is *NEEDED* in order
* for interactive menus to work with the other VMR9 in renderless mode */
var dummyRenderer = (IBaseFilter)new VideoMixingRenderer9();
var dummyRendererConfig = (IVMRFilterConfig9)dummyRenderer;
/* In order for this interactive menu trick to work, the VMR9
* must be set to Windowed. We will make sure the window is hidden later on */
hr = dummyRendererConfig.SetRenderingMode(VMR9Mode.Windowed);
DsError.ThrowExceptionForHR(hr);
hr = dummyRendererConfig.SetNumberOfStreams(1);
DsError.ThrowExceptionForHR(hr);
hr = m_graph.AddFilter(dummyRenderer, "Dummy Windowed");
DsError.ThrowExceptionForHR(hr);
if (dvdAudioPin != null)
{
/* This should render out to the default audio device. We
* could modify this code here to go out any audio
* device, such as SPDIF or another sound card */
hr = m_graph.Render(dvdAudioPin);
DsError.ThrowExceptionForHR(hr);
}
/* Get the first input pin on our dummy renderer */
m_dummyRendererPin = DsFindPin.ByConnectionStatus(dummyRenderer, /* Filter to search */
PinConnectedStatus.Unconnected,
0);
/* Get an available pin on our real renderer */
IPin rendererPin = DsFindPin.ByConnectionStatus(m_renderer, /* Filter to search */
PinConnectedStatus.Unconnected,
0); /* Pin index */
/* Connect the pin to the renderer */
hr = m_graph.Connect(dvdVideoPin, rendererPin);
DsError.ThrowExceptionForHR(hr);
/* Get the next available pin on our real renderer */
rendererPin = DsFindPin.ByConnectionStatus(m_renderer, /* Filter to search */
PinConnectedStatus.Unconnected,
0); /* Pin index */
/* Render the sub picture, which will connect
* the DVD navigator to the codec, not the renderer */
hr = m_graph.Render(dvdSubPicturePin);
DsError.ThrowExceptionForHR(hr);
/* These are the subtypes most likely to be our dvd subpicture */
var preferedSubpictureTypes = new[]{MediaSubType.ARGB4444,
MediaSubType.AI44,
MediaSubType.AYUV,
MediaSubType.ARGB32};
IPin dvdSubPicturePinOut = null;
/* Find what should be the subpicture pin out */
foreach (var guidType in preferedSubpictureTypes)
{
dvdSubPicturePinOut = FindPinInGraphByMediaType(guidType, /* GUID of the media type being searched for */
PinDirection.Output,
m_graph); /* Our current graph */
if (dvdSubPicturePinOut != null)
break;
}
if (dvdSubPicturePinOut == null)
throw new Exception("Could not find the sub picture pin out");
/* Here we connec thte Dvd sub picture pin to the video renderer.
* This enables the overlays on Dvd menus and some closed
* captions to be rendered. */
hr = m_graph.Connect(dvdSubPicturePinOut, rendererPin);
DsError.ThrowExceptionForHR(hr);
/* Search for the Line21 out in the graph */
IPin line21Out = FindPinInGraphByMediaType(MediaType.AuxLine21Data,
PinDirection.Output,
m_graph);
if (line21Out == null)
throw new Exception("Could not find the Line21 pin out");
/* We connect our line21Out out in to the dummy renderer
* this is what ultimatly makes interactive DVDs work with
* VMR9 in renderless (for WPF) */
hr = m_graph.Connect(line21Out, m_dummyRendererPin);
DsError.ThrowExceptionForHR(hr);
/* This is the dummy renderers Win32 window. */
m_dummyRenderWindow = dummyRenderer as IVideoWindow;
if (m_dummyRenderWindow == null)
throw new Exception("Could not QueryInterface for IVideoWindow");
ConfigureDummyWindow();
/* Setup our base classes with this filter graph */
SetupFilterGraph(m_graph);
/* Sets the NaturalVideoWidth/Height */
SetNativePixelSizes(m_renderer);
}
catch (Exception ex)
{
FreeResources();
InvokeMediaFailed(new MediaFailedEventArgs(ex.Message, ex));
return;
}
InvokeMediaOpened();
}
private void SetupSampleGrabber(ISampleGrabber sampleGrabber)
{
var mediaType = new AMMediaType
{
majorType = MediaType.Video,
subType = MediaSubType.RGB24,
formatType = FormatType.VideoInfo
};
int hr = sampleGrabber.SetMediaType(mediaType);
DsUtils.FreeAMMediaType(mediaType);
DsError.ThrowExceptionForHR(hr);
hr = sampleGrabber.SetCallback(this, 0);
DsError.ThrowExceptionForHR(hr);
}
int ISampleGrabberCB.SampleCB(double sampleTime, IMediaSample pSample)
{
var mediaType = new AMMediaType();
/* We query for the media type the sample grabber is using */
int hr = m_sampleGrabber.GetConnectedMediaType(mediaType);
var videoInfo = new VideoInfoHeader();
/* 'Cast' the pointer to our managed struct */
Marshal.PtrToStructure(mediaType.formatPtr, videoInfo);
/* The stride is "How many bytes across for each pixel line (0 to width)" */
int stride = Math.Abs(videoInfo.BmiHeader.Width * (videoInfo.BmiHeader.BitCount / 8 /* eight bits per byte */));
int width = videoInfo.BmiHeader.Width;
int height = videoInfo.BmiHeader.Height;
if(m_videoFrame == null)
InitializeBitmapFrame(width, height);
if (m_videoFrame == null)
return 0;
BitmapData bmpData = m_videoFrame.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite,
PixelFormat.Format24bppRgb);
/* Get the pointer to the pixels */
IntPtr pBmp = bmpData.Scan0;
IntPtr samplePtr;
/* Get the native pointer to the sample */
pSample.GetPointer(out samplePtr);
int pSize = stride * height;
/* Copy the memory from the sample pointer to our bitmap pixel pointer */
CopyMemory(pBmp, samplePtr, pSize);
m_videoFrame.UnlockBits(bmpData);
InvokeNewVideoSample(new VideoSampleArgs { VideoFrame = m_videoFrame });
DsUtils.FreeAMMediaType(mediaType);
/* Dereference the sample COM object */
Marshal.ReleaseComObject(pSample);
return 0;
}
private void SetupSampleGrabber()
{
if (_graph == null)
return;
int hr;
//Get directsound filter
IBaseFilter directSoundFilter;
hr = _graph.FindFilterByName(DEFAULT_AUDIO_RENDERER_NAME, out directSoundFilter);
DsError.ThrowExceptionForHR(hr);
IPin rendererPinIn = DsFindPin.ByConnectionStatus(directSoundFilter, PinConnectedStatus.Connected, 0);
if (rendererPinIn != null)
{
IPin audioPinOut;
hr = rendererPinIn.ConnectedTo(out audioPinOut);
DsError.ThrowExceptionForHR(hr);
if (audioPinOut != null)
{
//Disconect audio decoder to directsound renderer
hr = audioPinOut.Disconnect();
DsError.ThrowExceptionForHR(hr);
hr = _graph.RemoveFilter(directSoundFilter);
DsError.ThrowExceptionForHR(hr);
//Add Sample Grabber
ISampleGrabber sampleGrabber = new SampleGrabber() as ISampleGrabber;
hr = sampleGrabber.SetCallback(this, 1);
DsError.ThrowExceptionForHR(hr);
AMMediaType media;
media = new AMMediaType();
media.majorType = MediaType.Audio;
media.subType = MediaSubType.PCM;
media.formatType = FormatType.WaveEx;
hr = sampleGrabber.SetMediaType(media);
DsError.ThrowExceptionForHR(hr);
IPin sampleGrabberPinIn = DsFindPin.ByDirection((IBaseFilter)sampleGrabber, PinDirection.Input, 0);
IPin sampleGrabberPinOut = DsFindPin.ByDirection((IBaseFilter)sampleGrabber, PinDirection.Output, 0);
hr = _graph.AddFilter((IBaseFilter)sampleGrabber, "SampleGrabber");
DsError.ThrowExceptionForHR(hr);
PinInfo pinInfo;
hr = audioPinOut.QueryPinInfo(out pinInfo);
DsError.ThrowExceptionForHR(hr);
FilterInfo filterInfo;
hr = pinInfo.filter.QueryFilterInfo(out filterInfo);
DsError.ThrowExceptionForHR(hr);
hr = _graph.Connect(audioPinOut, sampleGrabberPinIn);
DsError.ThrowExceptionForHR(hr);
//Add null renderer
NullRenderer nullRenderer = new NullRenderer();
hr = _graph.AddFilter((IBaseFilter)nullRenderer, "NullRenderer");
DsError.ThrowExceptionForHR(hr);
IPin nullRendererPinIn = DsFindPin.ByDirection((IBaseFilter)nullRenderer, PinDirection.Input, 0);
hr = _graph.Connect(sampleGrabberPinOut, nullRendererPinIn);
DsError.ThrowExceptionForHR(hr);
_audioEngine.Setup(this.GetSampleGrabberFormat(sampleGrabber));
}
}
}
public WaveFormatEx GetSampleGrabberFormat(ISampleGrabber sampleGrabber)
{
int hr;
AMMediaType mediaInfo = new AMMediaType();
hr = sampleGrabber.GetConnectedMediaType(mediaInfo);
DsError.ThrowExceptionForHR(hr);
if ((mediaInfo.formatType != FormatType.WaveEx) || (mediaInfo.formatPtr == IntPtr.Zero))
{
throw new NotSupportedException("Unknown Grabber Media Format");
}
WaveFormatEx format = new WaveFormatEx();
format = (WaveFormatEx)Marshal.PtrToStructure(mediaInfo.formatPtr, typeof(WaveFormatEx));
Marshal.FreeCoTaskMem(mediaInfo.formatPtr);
mediaInfo.formatPtr = IntPtr.Zero;
return format;
}
/// <summary>
/// Reads the video stream information for the media file
/// </summary>
private void ReadVideoFormat(AMMediaType mediaType)
{
m_videoSubType = mediaType.subType;
int hr = m_mediaDet.get_StreamLength(out m_videoStreamLength);
DsError.ThrowExceptionForHR(hr);
if(mediaType.formatType == FormatType.VideoInfo) /* Most common video major type */
{
HasVideo = true;
/* 'Cast' the unmanaged pointer to our managed struct so we can read the meta data */
var header = (VideoInfoHeader)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader));
m_fourCC = ConvertFourCC(header.BmiHeader.Compression);
m_videoBitsPerPixel = header.BmiHeader.BitCount;
m_videoResolution = new Size(header.BmiHeader.Width, header.BmiHeader.Height);
}
else if (mediaType.formatType == FormatType.VideoInfo2) /* Usually for interlaced video */
{
HasVideo = true;
/* 'Cast' the unmanaged pointer to our managed struct so we can read the meta data */
var header = (VideoInfoHeader2)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader2));
m_fourCC = ConvertFourCC(header.BmiHeader.Compression);
m_videoResolution = new Size(header.BmiHeader.Width, header.BmiHeader.Height);
m_videoBitsPerPixel = header.BmiHeader.BitCount;
/* TODO: Pull out VideoInfoHeader2 specifics */
}
}
/// <summary>
/// Reads the audio stream information from the media file
/// </summary>
private void ReadAudioFormat(AMMediaType mediaType)
{
m_audioSubType = mediaType.subType;
int hr = m_mediaDet.get_StreamLength(out m_audioStreamLength);
DsError.ThrowExceptionForHR(hr);
if(mediaType.formatType == FormatType.WaveEx)
{
HasAudio = true;
var waveFormatEx = (WaveFormatEx)Marshal.PtrToStructure(mediaType.formatPtr, typeof(WaveFormatEx));
m_audioChannels = waveFormatEx.nChannels;
m_audioSamplesPerSecond = (waveFormatEx.nSamplesPerSec);
m_audioBitsPerSample = waveFormatEx.wBitsPerSample;
}
}
private void LoadMedia()
{
/*Create the COM object and query the IMediaDet interface */
m_mediaDet = new MediaDet() as IMediaDet;
if (m_mediaDet == null)
throw new NullReferenceException("Could not create an instance of MediaDet COM");
int hr = m_mediaDet.put_Filename(m_filename);
DsError.ThrowExceptionForHR(hr);
/* We find out how many streams exist in the
* media file. These can be audio, video, etc */
hr = m_mediaDet.get_OutputStreams(out m_streamCount);
DsError.ThrowExceptionForHR(hr);
/* Loop over each of the streams and extract info from them */
for(int i = 0; i < m_streamCount; i++)
{
/* Set the interface to look at a specific stream */
hr = m_mediaDet.put_CurrentStream(i);
DsError.ThrowExceptionForHR(hr);
Guid majorType;
/* Get the major type of the media */
hr = m_mediaDet.get_StreamType(out majorType);
DsError.ThrowExceptionForHR(hr);
var mediaType = new AMMediaType();
/* Gets the AMMediaType so we can read some
* metadata on the stream */
hr = m_mediaDet.get_StreamMediaType(mediaType);
DsError.ThrowExceptionForHR(hr);
if(majorType == MediaType.Video)
{
ReadVideoFormat(mediaType);
}
else if(majorType == MediaType.Audio)
{
ReadAudioFormat(mediaType);
}
/* We need to free this with the helper
* because it has an unmanaged pointer
* and we don't want any leaks */
DsUtils.FreeAMMediaType(mediaType);
}
}
