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

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Message-ID: <6e54af5243d324c5df1c9ec18d4b091fbd52150f.camel@ndufresne.ca>
Date:   Mon, 04 Jul 2022 12:05:35 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: amphion: only insert the first sequence
 startcode for vc1l format

Hi Ming,

Le mardi 28 juin 2022 à 13:20 +0800, Ming Qian a écrit :
> For some formats, the amphion vpu requires startcode
> before sequence and frame, such as vc1, vp8.

I'm not sure why VP8 is being mentioned here. There is no specified sartcode for
VP8, and no split of headers either.

> 
> 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.
> 
> 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,