linux-kernel - RE: [EXT] Re: [PATCH] media: amphion: only insert the first sequence startcode for vc1l format

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Date:   Wed, 29 Jun 2022 12:53:07 +0000
From:   Ming Qian <ming.qian@....com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        "mchehab@...nel.org" <mchehab@...nel.org>
CC:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH] media: amphion: only insert the first sequence
 startcode for vc1l format

> From: Hans Verkuil <hverkuil-cisco@...all.nl>
> Sent: Wednesday, June 29, 2022 8:10 PM
> To: Ming Qian <ming.qian@....com>; mchehab@...nel.org
> Cc: shawnguo@...nel.org; robh+dt@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; dl-linux-imx <linux-
> imx@....com>; linux-media@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org
> Subject: [EXT] Re: [PATCH] media: amphion: only insert the first sequence
> startcode for vc1l format
> 
> Caution: EXT Email
> 
> On 28/06/2022 07:20, Ming Qian wrote:
> > For some formats, the amphion vpu requires startcode before sequence
> > and frame, such as vc1, vp8.
> >
> > But for V4L2_PIX_FMT_VC1_ANNEX_L, only the first sequence startcode is
> > needed, the extra startcode will cause decoding error.
> > So after seek, we don't need to insert the sequence startcode.
> >
> > In other words, for V4L2_PIX_FMT_VC1_ANNEX_L, the vpu doesn't
> support
> > dynamic resolution change.
> 
> Shouldn't V4L2_FMT_FLAG_DYN_RESOLUTION be removed from that format
> since it doesn't support this feature?
> 
> Regards,
> 
>         Hans
> 

I have a question, for format VC1L,  the V4L2_EVENT_SOURCE_CHANGE event still may be sent at the beginning,
If the parameters parsed from the first sequence header are different from those previously established.

So should I remove the V4L2_FMT_FLAG_DYN_RESOLUTION flag or not?

Ming

> >
> > Fixes: 145e936380edb ("media: amphion: implement malone decoder rpc
> > interface")
> > Signed-off-by: Ming Qian <ming.qian@....com>
> > ---
> >  drivers/media/platform/amphion/vdec.c       | 1 +
> >  drivers/media/platform/amphion/vpu.h        | 1 +
> >  drivers/media/platform/amphion/vpu_malone.c | 2 ++
> >  drivers/media/platform/amphion/vpu_rpc.h    | 7 ++++++-
> >  4 files changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/amphion/vdec.c
> > b/drivers/media/platform/amphion/vdec.c
> > index 09d4f27970ec..51218a41a5ac 100644
> > --- a/drivers/media/platform/amphion/vdec.c
> > +++ b/drivers/media/platform/amphion/vdec.c
> > @@ -731,6 +731,7 @@ static void vdec_stop_done(struct vpu_inst *inst)
> >       vdec->eos_received = 0;
> >       vdec->is_source_changed = false;
> >       vdec->source_change = 0;
> > +     inst->total_input_count = 0;
> >       vpu_inst_unlock(inst);
> >  }
> >
> > diff --git a/drivers/media/platform/amphion/vpu.h
> > b/drivers/media/platform/amphion/vpu.h
> > index e56b96a7e5d3..f914de6ed81e 100644
> > --- a/drivers/media/platform/amphion/vpu.h
> > +++ b/drivers/media/platform/amphion/vpu.h
> > @@ -258,6 +258,7 @@ struct vpu_inst {
> >       struct vpu_format cap_format;
> >       u32 min_buffer_cap;
> >       u32 min_buffer_out;
> > +     u32 total_input_count;
> >
> >       struct v4l2_rect crop;
> >       u32 colorspace;
> > diff --git a/drivers/media/platform/amphion/vpu_malone.c
> > b/drivers/media/platform/amphion/vpu_malone.c
> > index c62b49e85060..f4a488bf9880 100644
> > --- a/drivers/media/platform/amphion/vpu_malone.c
> > +++ b/drivers/media/platform/amphion/vpu_malone.c
> > @@ -1314,6 +1314,8 @@ static int
> vpu_malone_insert_scode_vc1_l_seq(struct malone_scode_t *scode)
> >       int size = 0;
> >       u8 rcv_seqhdr[MALONE_VC1_RCV_SEQ_HEADER_LEN];
> >
> > +     if (scode->inst->total_input_count)
> > +             return 0;
> >       scode->need_data = 0;
> >
> >       ret = vpu_malone_insert_scode_seq(scode,
> > MALONE_CODEC_ID_VC1_SIMPLE, sizeof(rcv_seqhdr)); diff --git
> > a/drivers/media/platform/amphion/vpu_rpc.h
> > b/drivers/media/platform/amphion/vpu_rpc.h
> > index 25119e5e807e..7eb6f01e6ab5 100644
> > --- a/drivers/media/platform/amphion/vpu_rpc.h
> > +++ b/drivers/media/platform/amphion/vpu_rpc.h
> > @@ -312,11 +312,16 @@ static inline int vpu_iface_input_frame(struct
> vpu_inst *inst,
> >                                       struct vb2_buffer *vb)  {
> >       struct vpu_iface_ops *ops = vpu_core_get_iface(inst->core);
> > +     int ret;
> >
> >       if (!ops || !ops->input_frame)
> >               return -EINVAL;
> >
> > -     return ops->input_frame(inst->core->iface, inst, vb);
> > +     ret = ops->input_frame(inst->core->iface, inst, vb);
> > +     if (ret < 0)
> > +             return ret;
> > +     inst->total_input_count++;
> > +     return ret;
> >  }
> >
> >  static inline int vpu_iface_config_memory_resource(struct vpu_inst *inst,