[FFmpeg-devel] [PATCH] lavc/mediacodecdec_h264: use ff_h264_decode_extradata to extract PPS/SPS

Matthieu Bouron matthieu.bouron at gmail.com
Mon Jun 13 14:37:29 CEST 2016

On Mon, Jun 13, 2016 at 12:23:07PM +0200, Hendrik Leppkes wrote:
> On Mon, Jun 13, 2016 at 11:51 AM, Matthieu Bouron
> <matthieu.bouron at gmail.com> wrote:
> > On Fri, Jun 10, 2016 at 03:08:48PM +0200, Matthieu Bouron wrote:
> >> From: Matthieu Bouron <matthieu.bouron at stupeflix.com>
> >>
> >> Fixes playback of HLS streams on MediaTek devices which requires PPS/SPS
> >> to be set in their respective csd-{0,1} buffers.
> >> ---
> >>
> >> Hello,
> >>
> >> The attached patch fixes playback of HLS streams on MediaTek devices which
> >> requires PPS/SPS to be set in their respetive csd-{0,1} buffers (instead of
> >> having sps+pps in the csd-0 which works on other devices).
> >>
> >> I'm not sure if I can use the ff_h264_decode_extradata this way (or at least
> >> initialize the H264Context with zeroes minus the avctx field).
> >
> > Rebased patch (after the h264 ps merged) attached.
> >
> > I still have the same question, is my use of
> > H264Context + ff_h264_decode_extradata correct ?
> >
> Using H264 decoder internals seems to be a rather unfortunate
> solution, as its prone to breakage, often subtle, as the h264 decoder
> gets changed and not all inter-module dependencies are known.
> So if possible at all, not using something that uses H264Context for
> example would be nice.
> For the record, ff_h264_decode_extradata is scheduled for refactoring
> to make it independent of H264Context so it can be more easily shared
> with the h264 decoder and the h264 parser.
> Once that is done, it may give you a cleaner interface to use it from
> mediacodec as well.

Ok. I can wait for the refactor to be merged but the MediaCodec decoder
will remain broken on those devices. I'm not too happy about that if a
release is to be made in those following days. Do we have an ETA ?  I'm
also not too happy to write the same parsing code as I did before for the
AVCC format to split/extract the PPS/SPS.

Or ..., I can push this code (if its use is valid) and update it when the
merge lands (I'm helping Clément with the merges, so I will take care
about this part).



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