Modify frame data before rendering

[yangpenglove]

Hello,

Is there a way to get frame data before rendering on opengl context? I want to add some specical filter on mpv but they are not ffmpeg filters, I checked document and found it seems mpv_render_context_get_info can get the next frame, but I am not sure I can modify the data of MPV_RENDER_PARAM_SW_POINTER.

I googled but cannot find any sample codes, do we have some samples?

Thanks