[linux-dvb] [RFC] ioctls to read PTS of a decoder

Johannes Stezenbach js at linuxtv.org
Thu Feb 16 18:54:19 CET 2006


On Thu, Feb 16, 2006, Andreas Oberritter wrote:
> we'd like to read the presentation timestamp of audio and video
> decoders. That is (in preferred order) the PTS of the currently played
> frame or the last decoded frame or the last extracted PTS from a PES.
> The intention is to gain knowledge about the currently display picture
> or sound. Using this it is easier to calculate how far playback or
> trickmode has progressed, where to jump during fast forward or which
> picture is actually displayed during a pause.
> 
> To make it possible I propose adding these two ioctls to audio.h and
> video.h:
> 
> #define AUDIO_GET_PTS              _IOR('o', 19, __u64)
> #define VIDEO_GET_PTS              _IOR('o', 57, __u64)

No objections from my side. Are you going to send
a complete patch? If so, please document the exact
semantics of the calls and the format/unit of the
pts value in video.h/audio.h.

Johannes



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