[FFmpeg-devel] [PATCH] avcodec/wmaprodec: skip foreign XMA packets

[Paul B Mahol]

On Tue, Aug 31, 2021 at 11:19 PM Joel Linn <jl at conductive.de> wrote:

> On 2021-08-31 23:13, Paul B Mahol wrote:
> > On Tue, Aug 31, 2021 at 11:10 PM Joel Linn <jl at conductive.de> wrote:
> >
> >> Hello,
> >>
> >> On 2021-08-31 22:53, Paul B Mahol wrote:
> >> > What samples this fixes?
> >>
> >> No specific sample, it depends on the way the decoder is invoked.
> >>
> >> It fixes using the xma1/2 decoder directly on a memory buffer and not
> >> wanting to decode all channels in the stream.
> >> Say the stream has 6 channels and one wants to only decode 2.
> >> Previously this was not possible due to the skip logic of the channel
> >> interleaving.
> >>
> >> This should also make the decoder more robust because in theory it is
> >> possible to have an xma stream which has chunks of 2kB junk data
> >> (packets) which are expected to be skipped due to the skip_packets
> >> numbers.
> >> I haven't seen such streams though.
> >>
> >
> > Am I correct you already use XMA parser?
>
> In my case I was working with raw stream buffers, the XMA format (RIFF)
> headers are invisible to me.
> The format is parsed and processed by guest code (inside xenia
> emulator).
> ffmpeg replaces a hardware decoder dsp in this case.
>

You should really use XMA parser, it have nothing to do with RIFF.


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