[Live-devel] get H.264 frame width and height out of SPS

[Ross Finlayson]

> On Mar 23, 2017, at 8:45 AM, Ross Finlayson <finlayson at live555.com> wrote:
> 
>> Given that I would expect this to be a quite common task, I wanted to ask if there are some helper classes/functions in live555 that already prase the SPS and give me what I want.
> 
> No there aren’t

I realized just now that this isn’t totally correct.

We *do* have some H.264 (and H.265) parsing code in the file “liveMedia/H264or5VideoStreamFramer.cpp”.  This is used to parse raw H.264 (and H.265) video byte streams - in particular, so that our servers know the proper frame rate for the video.

Note in particular the function “analyze_seq_parameter_set_data()”, which does some parsing of SPS NAL units.  (It does this to look for timing information, not width/height, but you might still find it useful.)


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/