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GstVideoAffineTransformationMeta *
gst_buffer_add_video_affine_transformation_meta
(GstBuffer *buffer);
#define gst_buffer_get_video_affine_transformation_meta(b)
void gst_video_affine_transformation_meta_apply_matrix (GstVideoAffineTransformationMeta *meta,const gfloat matrix[16]);