On 20/04/2020 16:38, Stanimir Varbanov wrote: > Hi, > > I need to port a decoder v4l2 control in mainline Venus driver which > instructs the decoder to decode sync frames only (I frame/ IDR frame). > In practice the usage of such control is to generate thumbnails for > particular video. > > To do that I researched what we have currently in v4l2-controls.h and > found something similar but for encoders: > > V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME > "Force a key frame for the next queued buffer. Applicable to encoders. > This is a general, codec-agnostic keyframe control." > > I think I have two options: > > 1. reuse V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME for the decoder and document it > > 2. create a new v4l control V4L2_CID_MPEG_VIDC_VIDEO_SYNC_FRAME_DECODE Make a new v4l control. The encoder control is for something quite different. How about V4L2_CID_MPEG_VIDEO_DEC_KEY_FRAMES_ONLY? Regards, Hans
