linux-kernel - RE: [EXT] Re: [PATCH v13 08/13] media: amphion: add v4l2 m2m vpu decoder stateful driver

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Date:   Sat, 4 Dec 2021 02:39:25 +0000
From:   Ming Qian <ming.qian@....com>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        "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 v13 08/13] media: amphion: add v4l2 m2m vpu
 decoder stateful driver


> -----Original Message-----
> From: Nicolas Dufresne [mailto:nicolas@...fresne.ca]
> Sent: Friday, December 3, 2021 11:10 PM
> To: Ming Qian <ming.qian@....com>; mchehab@...nel.org;
> shawnguo@...nel.org; robh+dt@...nel.org; s.hauer@...gutronix.de
> Cc: hverkuil-cisco@...all.nl; kernel@...gutronix.de; festevam@...il.com;
> dl-linux-imx <linux-imx@....com>; Aisheng Dong <aisheng.dong@....com>;
> linux-media@...r.kernel.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [EXT] Re: [PATCH v13 08/13] media: amphion: add v4l2 m2m vpu
> decoder stateful driver
> 
> Caution: EXT Email
> 
> Le vendredi 03 décembre 2021 à 06:01 +0000, Ming Qian a écrit :
> > > -----Original Message-----
> > > From: Ming Qian
> > > Sent: Friday, December 3, 2021 1:43 PM
> > > To: Nicolas Dufresne <nicolas@...fresne.ca>; mchehab@...nel.org;
> > > shawnguo@...nel.org; robh+dt@...nel.org; s.hauer@...gutronix.de
> > > Cc: hverkuil-cisco@...all.nl; kernel@...gutronix.de;
> > > festevam@...il.com; dl-linux-imx <linux-imx@....com>; Aisheng Dong
> > > <aisheng.dong@....com>; linux-media@...r.kernel.org;
> > > linux-kernel@...r.kernel.org; devicetree@...r.kernel.org;
> > > linux-arm-kernel@...ts.infradead.org
> > > Subject: RE: [EXT] Re: [PATCH v13 08/13] media: amphion: add v4l2
> > > m2m vpu decoder stateful driver
> > >
> > > > -----Original Message-----
> > > > From: Nicolas Dufresne [mailto:nicolas@...fresne.ca]
> > > > Sent: Friday, December 3, 2021 12:56 PM
> > > > To: Ming Qian <ming.qian@....com>; mchehab@...nel.org;
> > > > shawnguo@...nel.org; robh+dt@...nel.org; s.hauer@...gutronix.de
> > > > Cc: hverkuil-cisco@...all.nl; kernel@...gutronix.de;
> > > > festevam@...il.com; dl-linux-imx <linux-imx@....com>; Aisheng Dong
> > > > <aisheng.dong@....com>; linux-media@...r.kernel.org;
> > > > linux-kernel@...r.kernel.org; devicetree@...r.kernel.org;
> > > > linux-arm-kernel@...ts.infradead.org
> > > > Subject: [EXT] Re: [PATCH v13 08/13] media: amphion: add v4l2 m2m
> > > > vpu decoder stateful driver
> > > >
> > > > Caution: EXT Email
> > > >
> > > > Le mardi 30 novembre 2021 à 17:48 +0800, Ming Qian a écrit :
> > > > > This consists of video decoder implementation plus decoder controls.
> > > > >
> > > > > Signed-off-by: Ming Qian <ming.qian@....com>
> > > > > Signed-off-by: Shijie Qin <shijie.qin@....com>
> > > > > Signed-off-by: Zhou Peng <eagle.zhou@....com>
> > > > > ---
> > > > >  drivers/media/platform/amphion/vdec.c | 1680
> > > > +++++++++++++++++++++++++
> > >
> > >
> > > > > +
> > > > > +static void vdec_init_fmt(struct vpu_inst *inst) {
> > > > > +     struct vdec_t *vdec = inst->priv;
> > > > > +     const struct vpu_format *fmt;
> > > > > +     int i;
> > > > > +
> > > > > +     fmt = vpu_helper_find_format(inst, inst->cap_format.type,
> > > > vdec->codec_info.pixfmt);
> > > > > +     inst->out_format.width = vdec->codec_info.width;
> > > > > +     inst->out_format.height = vdec->codec_info.height;
> > > > > +     inst->cap_format.width = vdec->codec_info.decoded_width;
> > > > > +     inst->cap_format.height = vdec->codec_info.decoded_height;
> > > > > +     inst->cap_format.pixfmt = vdec->codec_info.pixfmt;
> > > > > +     if (fmt) {
> > > > > +             inst->cap_format.num_planes = fmt->num_planes;
> > > > > +             inst->cap_format.flags = fmt->flags;
> > > > > +     }
> > > > > +     for (i = 0; i < inst->cap_format.num_planes; i++) {
> > > > > +             inst->cap_format.bytesperline[i] =
> > > > vdec->codec_info.bytesperline[i];
> > > > > +             inst->cap_format.sizeimage[i] =
> > > > vdec->codec_info.sizeimage[i];
> > > > > +     }
> > > > > +     if (vdec->codec_info.progressive)
> > > > > +             inst->cap_format.field = V4L2_FIELD_NONE;
> > > > > +     else
> > > > > +             inst->cap_format.field = V4L2_FIELD_INTERLACED;
> > > >
> > > > As a followup, this should be conditional to the chosen pixel format.
> > > > If I understood correct, you produce interlaced is only produce
> > > > for linear NV12, for tiled the fields are outputed seperated in
> > > > their respective v4l2_buffer. Note sure where yet, but the V4L2
> > > > spec requires you to pair the fields by using the same seq_num on both.
> > >
> > > The amphion vpu will store the two fields into one v4l2_buf, So I'll
> > > change V4L2_FIELD_INTERLACED to V4L2_FIELD_SEQ_TB
> > >
> >
> > Hi Nicolas,
> >     Seems gstreamer doesn't support V4L2_FIELD_SEQ_TB yet.
> >
> >   switch (fmt.fmt.pix.field) {
> >     case V4L2_FIELD_ANY:
> >     case V4L2_FIELD_NONE:
> >       interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE;
> >       break;
> >     case V4L2_FIELD_INTERLACED:
> >     case V4L2_FIELD_INTERLACED_TB:
> >     case V4L2_FIELD_INTERLACED_BT:
> >       interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
> >       break;
> >     case V4L2_FIELD_ALTERNATE:
> >       interlace_mode = GST_VIDEO_INTERLACE_MODE_ALTERNATE;
> >       break;
> >     default:
> >       goto unsupported_field;
> >   }
> 
> This is correct, I had never had the chance to implement it. So far I only know
> IMX6 camera pipeline producing that, but rarely used in practice. What
> matters here is that your driver does report the right information so that
> userspace don't get fooled into thinking it's interleaved.
> 
OK, then no problem.

> >
> > > >
> > > > > +     if (vdec->codec_info.color_primaries ==
> > > V4L2_COLORSPACE_DEFAULT)
> > > > > +             vdec->codec_info.color_primaries =
> > > > V4L2_COLORSPACE_REC709;
> > > > > +     if (vdec->codec_info.transfer_chars ==
> V4L2_XFER_FUNC_DEFAULT)
> > > > > +             vdec->codec_info.transfer_chars =
> V4L2_XFER_FUNC_709;
> > > > > +     if (vdec->codec_info.matrix_coeffs ==
> V4L2_YCBCR_ENC_DEFAULT)
> > > > > +             vdec->codec_info.matrix_coeffs =
> V4L2_YCBCR_ENC_709;
> > > > > +     if (vdec->codec_info.full_range ==
> V4L2_QUANTIZATION_DEFAULT)
> > > > > +             vdec->codec_info.full_range =
> > > > V4L2_QUANTIZATION_LIM_RANGE;
> > > > > +}
> > > > > +