compat/avisynth/avisynth_c_25.h

//  Copyright (c) 2011 FFmpegSource Project
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/* these are defines/functions that are used and were changed in the switch to 2.6
 * and are needed to maintain full compatility with 2.5 */

enum {
  AVS_CS_YV12_25 = 1<<3 | AVS_CS_YUV | AVS_CS_PLANAR,  // y-v-u, planar
  AVS_CS_I420_25 = 1<<4 | AVS_CS_YUV | AVS_CS_PLANAR,  // y-u-v, planar
};

AVSC_INLINE int avs_get_height_p_25(const AVS_VideoFrame * p, int plane) {
    switch (plane)
    {
        case AVS_PLANAR_U: case AVS_PLANAR_V:
            if (p->pitchUV)
                return p->height>>1;
            return 0;
    }
    return p->height;}

AVSC_INLINE int avs_get_row_size_p_25(const AVS_VideoFrame * p, int plane) {
    int r;
    switch (plane)
    {
    case AVS_PLANAR_U: case AVS_PLANAR_V:
        if (p->pitchUV)
            return p->row_size>>1;
        else
            return 0;
    case AVS_PLANAR_U_ALIGNED: case AVS_PLANAR_V_ALIGNED:
        if (p->pitchUV)
        {
            r = ((p->row_size+AVS_FRAME_ALIGN-1)&(~(AVS_FRAME_ALIGN-1)) )>>1; // Aligned rowsize
            if (r < p->pitchUV)
                return r;
            return p->row_size>>1;
        }
        else
            return 0;
    case AVS_PLANAR_Y_ALIGNED:
        r = (p->row_size+AVS_FRAME_ALIGN-1)&(~(AVS_FRAME_ALIGN-1)); // Aligned rowsize
        if (r <= p->pitch)
            return r;
        return p->row_size;
    }
    return p->row_size;
}

AVSC_INLINE int avs_is_yv12_25(const AVS_VideoInfo * p)
    { return ((p->pixel_type & AVS_CS_YV12_25) == AVS_CS_YV12_25)||((p->pixel_type & AVS_CS_I420_25) == AVS_CS_I420_25); }