Filter SDK/Two-Five pixel type

From Avisynth

The internals of VideoInfo.pixel_type has been completely changed. The type has been changed from byte to int, and now contains different information than before. This is important when building a Source filter, when you have to set the pixel_type. You have to change your constants to reflect this change.

In general filters should not care about these values at all - only if they set or modify them. For checking what colorspace the video material is in, use one of the following functions in VideoInfo.

bool IsRGB();
bool IsRGB24();
bool IsRGB32();
bool IsYUV();
bool IsYUY2();
bool IsYV12();
bool IsPlanar();

If you need to set the pixel type, use a syntax like:

vi.pixel_type = VideoInfo::CS_YUY2;  // Version 2.5 syntax

instead of:

vi.pixel_type = VideoInfo::YUY2; // Version 2.0 syntax

Other possibilities are:

CS_BGR24,
CS_BGR32,
CS_YUY2,
CS_YV12,  // y-v-u, planar
CS_I420,  // y-u-v, planar
CS_IYUV   // same as above

The last two are automatically converted to YV12, so filter writers should not worry about these.

See also Working with Images.

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