if non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw an horizontal band. It improve cache usage. Not all codecs can do that. You must check the codec capabilities before
- encoding: unused
- decoding: set by user.
|height ||the height of the slice |
|y ||the y position of the slice |
|type ||1->top field, 2->bottom field, 3->frame |
|offset ||offset into the AVFrame.data from which the slice should be read |
Referenced by ff_draw_horiz_band().