linux-kernel - Re: [EXT] Re: [PATCH v12 00/13] amphion video decoder/encoder driver

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Date:   Thu, 25 Nov 2021 10:36:17 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Ming Qian <ming.qian@....com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Cc:     "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXT] Re: [PATCH v12 00/13] amphion video decoder/encoder driver

Le jeudi 25 novembre 2021 à 05:25 +0000, Ming Qian a écrit :
> For test [JCT-VC-HEVC_V1] (GStreamer-H.265-V4L2-Gst1.0) VPSSPSPPS_A_MainConcept_1,
> The vpu report an unsupported message to driver, so driver report pollerr to gstreamer.
> But this stream can be decoded using the amphion vpu when I test it using our unit test,
> I checked the difference, there are many vps, sps and pps at the beginning, 
> gstreamer will skip the first vpu and two pps, totally skip 56 bytes. It leds to vpu can't decode
> And our unit test won't skip anthing, so the vpu can decode the stream.

This specific test triggers a bug in GStreamer HEVC parser, I'm aware of this
one, and it is on my todo to fix (just not as trivial as it looks like, the VCL
nal detection code was implemented wrong and that ended up leaking into the rest
of the design). This specific test will of course be marked and skipped for CI
test that uses GStreamer.

regards,
Nicolas