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

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Message-ID: <AM6PR04MB634164BB9F5AD2AFD962187DE7BB9@AM6PR04MB6341.eurprd04.prod.outlook.com>
Date:   Wed, 29 Jun 2022 13:08:07 +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 9:03 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: Re: [EXT] Re: [PATCH] media: amphion: only insert the first
> sequence startcode for vc1l format
> 
> Caution: EXT Email
> 
> On 29/06/2022 14:53, Ming Qian wrote:
> >> 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?
> 
> Yes. That flag only applies if resolution changes can happen after the first
> frame was decoded. It does not apply to the initial resolution change which
> happens before decoding the first frame (i.e. after reading the header(s) at
> the start).

Got it, I'll remove it in V2 patch

> 
> Regards,
> 
>         Hans
> 
> >
> > 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,
> >