Filter SDK/C API/AVS VideoInfo

The AVS_VideoInfo structure holds global information about a clip (i.e. information that does not depend on the frame number). It's a member of the AVS_FilterInfo structure. Below is a description of it (for AVISYNTH_INTERFACE_VERSION=6).

Properties and constants

• Colorspace constants, Colorformat constants and Image_type constants:

These constants are the same as the ones in the C++ API with a AVS_ prefix. For example, the C++ API constant CS_BGR becomes AVS_CS_BGR.

For some reason these constants are not part of the AVS_VideoInfo structure. Why not???

• Colorspace properties, Image_type properties and General properties:

These are the same as in the C++ API.

• Chroma placement constants (bits 20 -> 23):

They are missing in the C API. Todo: add them in the API.

• Remaining constants (they are not present in the C++ API):

enum {
 AVS_FILTER_TYPE=1,
 AVS_FILTER_INPUT_COLORSPACE=2,
 AVS_FILTER_OUTPUT_TYPE=9,
 AVS_FILTER_NAME=4,
 AVS_FILTER_AUTHOR=5,
 AVS_FILTER_VERSION=6,
 AVS_FILTER_ARGS=7,
 AVS_FILTER_ARGS_INFO=8,
 AVS_FILTER_ARGS_DESCRIPTION=10,
 AVS_FILTER_DESCRIPTION=11
};

enum {  //SUBTYPES
 AVS_FILTER_TYPE_AUDIO=1,
 AVS_FILTER_TYPE_VIDEO=2,
 AVS_FILTER_OUTPUT_TYPE_SAME=3,
 AVS_FILTER_OUTPUT_TYPE_DIFFERENT=4
};

Todo: add description.