| Microsoft DirectX 8.1 (C++) |
The VIDEO_STREAM_CONFIG_CAPS structure contains information about possible connections.
Syntax
typedef struct _VIDEO_STREAM_CONFIG_CAPS {
GUID guid;
ULONG VideoStandard;
SIZE InputSize;
SIZE MinCroppingSize;
SIZE MaxCroppingSize;
int CropGranularityX;
int CropGranularityY;
int CropAlignX;
int CropAlignY;
SIZE MinOutputSize;
SIZE MaxOutputSize;
int OutputGranularityX;
int OutputGranularityY;
int StretchTapsX;
int StretchTapsY;
int ShrinkTapsX;
int ShrinkTapsY;
LONGLONG MinFrameInterval;
LONGLONG MaxFrameInterval;
LONG MinBitsPerSecond;
LONG MaxBitsPerSecond;
} VIDEO_STREAM_CONFIG_CAPS;
Members
guid
GUID that identifies the format type. For example, FORMAT_VideoInfo or FORMAT_VideoInfo2. For more information, see the formattype member of the AM_MEDIA_TYPE structure.
VideoStandard
The analog video standard supported. Set in the AnalogVideoStandard enumeration type (0 if not supported).
InputSize
Size of the incoming signal, expressed through the Win32 SIZE structure as the image rectangle's width and height in pixels. For a compressor, the size is taken from the width and height members of the BITMAPINFOHEADER structure in the input pin's AM_MEDIA_TYPE structure. For a capture filter, the size is the largest signal the filter can digitize with every pixel remaining unique.
MinCroppingSize
Smallest cropping rectangle allowed, as specified in the VIDEOINFOHEADER structure's rcSource member.
MaxCroppingSize
Largest cropping rectangle allowed, as specified in the VIDEOINFOHEADER structure's rcSource member.
CropGranularityX
Granularity of the cropping size. For example, you could specify that the only valid widths are an even multiple of four.
CropGranularityY
Granularity of the cropping size. For example, you could specify that the only valid heights are an even multiple of four.
CropAlignX
Alignment of the cropping rectangle inside InputSize. For example, you could specify that rectangles must start on a boundary that is a multiple of four.
CropAlignY
Alignment of the cropping rectangle inside InputSize. For example, you could specify that rectangles must start on a boundary that is a multiple of four.
MinOutputSize
Smallest bitmap this pin can produce.
MaxOutputSize
Largest bitmap this pin can produce.
OutputGranularityX
Granularity of output bitmap width.
OutputGranularityY
Granularity of output bitmap height.
StretchTapsX
Value indicating how well the filter can stretch the image's width. A value of 0 means the filter can't stretch; 1 means it uses pixel doubling; 2 means it uses interpolation (2 taps); 3 and higher indicate it implements better interpolation.
StretchTapsY
Value indicating how well the filter can stretch the image's height. A value of 0 means the filter can't stretch; 1 means it uses pixel doubling; 2 means it uses interpolation (2 taps); 3 and higher indicate it implements better interpolation.
ShrinkTapsX
Value indicating how well the filter can shrink the image's width. A value of 0 means the filter can't shrink; 1 means it just eliminates some rows of pixels; 2 means it uses interpolation (2 taps); 3 and higher indicate it implements better interpolation.
ShrinkTapsY
Value indicating how well the filter can shrink the image's height. A value of 0 means the filter can't shrink; 1 means it just eliminates some rows of pixels; 2 means it uses interpolation (2 taps); 3 and higher indicate it implements better interpolation.
MinFrameInterval
Minimum frame rate allowed. This applies to the capture filter only.
MaxFrameInterval
Maximum frame rate allowed. This applies to the capture filter only.
MinBitsPerSecond
Minimum data rate this pin can produce.
MaxBitsPerSecond
Maximum data rate this pin can produce.
Remarks
For example, assume the following values for some of the structure members.
These values indicate that valid cropping sizes begin at MinCroppingSize and increase in steps in the x-direction by CropGranularityX and in the y-direction by CropGranularityY. In this case the x-value can be anywhere from 160 to 320 pixels in steps of 4 and the y-value can be anywhere from 120 to 240 pixels in steps of 8.
In this scenario a few of the valid sizes are:
CropAlignX and CropAlignY indicate where the cropping rectangle can be inside the input size rectangle. Given a 160 × 120 sized cropping rectangle and the following:
Some of the valid values for the VIDEOINFOHEADER structure's rcSource member are:
For a 320 × 240 cropping rectangle and the same cropping alignment values, (2, 4, 322, 244) is one example of the many legal rectangles.
The structure members discussed in this section work together to specify what values of rcSource are valid for the VIDEOINFOHEADER structure that describes the output pin's media type. Of the remaining structure members, MinOutputSize, MaxOutputSize, OutputGranularityX, and OutputGranularityY describe the biWidth and biHeight members of the BITMAPINFOHEADER structure contained in the output pin's media type VIDEOINFOHEADER structure.
See Also