Configurable rgb origin

[cblc]

When using functions like plm_frame_to_rgb(), the library assumes that row 0 is the top of the image. In some programming environments, like OpenGL for example, it's common to use row 0 at the bottom of the image, with rows increasing upwards. While you can do the vertical flip manually, it would have the overhead of an extra malloc() just for flipping the image. I think it would make sense that the library has a setting for specifying where's the origin of your image buffer (top-left, or bottom-left).

[phoboslab]

This seems a little contrived. Do you actually have that problem?

like OpenGL for example

If you care about performance here, you don't use plm_frame_to_rgb(), but instead do the RGB conversion in the pixel shader. You can also trivially flip in the vertex shader or tex coords. See pl_mpeg_player_gl.c.

it would have the overhead of an extra malloc()

it can be done in place.

Also, nothing is stopping you from implementing your own plm_frame_to_* function outside this library. You have access to the raw YCrCb buffers.