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Message-ID: <e8594414-eaea-4022-8835-0c093657b005@xs4all.nl>
Date:   Wed, 22 Nov 2023 17:03:53 +0100
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Subject: Re: [PATCH v2 2/5] media: visl: Add a stable_output parameter
Content-Language: en-US, nl
To:     Detlev Casanova <detlev.casanova@collabora.com>,
        linux-kernel@vger.kernel.org
Cc:     linux-media@vger.kernel.org,
        Daniel Almeida <daniel.almeida@collabora.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>
References: <20231024191027.305622-1-detlev.casanova@collabora.com>
 <20231024191027.305622-3-detlev.casanova@collabora.com>
From:   Hans Verkuil <hverkuil@xs4all.nl>
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In-Reply-To: <20231024191027.305622-3-detlev.casanova@collabora.com>
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On 24/10/2023 21:09, Detlev Casanova wrote:
> This parameter is used to ensure that for a given input, the output
> frames are always identical so that it can be compared against
> a reference in automatic tests.
> 
> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
> Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
> ---
>  drivers/media/test-drivers/visl/visl-core.c |   5 +
>  drivers/media/test-drivers/visl/visl-dec.c  | 125 +++++++++++---------
>  drivers/media/test-drivers/visl/visl.h      |   1 +
>  3 files changed, 77 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/visl/visl-core.c b/drivers/media/test-drivers/visl/visl-core.c
> index df6515530fbf..d28d50afec02 100644
> --- a/drivers/media/test-drivers/visl/visl-core.c
> +++ b/drivers/media/test-drivers/visl/visl-core.c
> @@ -88,6 +88,11 @@ module_param(bitstream_trace_nframes, uint, 0);
>  MODULE_PARM_DESC(bitstream_trace_nframes,
>  		 " the number of frames to dump the bitstream through debugfs");
>  
> +bool stable_output;
> +module_param(stable_output, bool, 0644);
> +MODULE_PARM_DESC(stable_output,
> +		 " only write stable data for a given input on the output frames");
> +
>  static const struct visl_ctrl_desc visl_fwht_ctrl_descs[] = {
>  	{
>  		.cfg.id = V4L2_CID_STATELESS_FWHT_PARAMS,
> diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
> index 318d675e5668..61cfca49ead9 100644
> --- a/drivers/media/test-drivers/visl/visl-dec.c
> +++ b/drivers/media/test-drivers/visl/visl-dec.c
> @@ -197,19 +197,30 @@ static void visl_tpg_fill_sequence(struct visl_ctx *ctx,
>  {
>  	u32 stream_ms;
>  
> -	stream_ms = jiffies_to_msecs(get_jiffies_64() - ctx->capture_streamon_jiffies);
> -
> -	scnprintf(buf, bufsz,
> -		  "stream time: %02d:%02d:%02d:%03d sequence:%u timestamp:%lld field:%s",
> -		  (stream_ms / (60 * 60 * 1000)) % 24,
> -		  (stream_ms / (60 * 1000)) % 60,
> -		  (stream_ms / 1000) % 60,
> -		  stream_ms % 1000,
> -		  run->dst->sequence,
> -		  run->dst->vb2_buf.timestamp,
> -		  (run->dst->field == V4L2_FIELD_ALTERNATE) ?
> -		  (run->dst->field == V4L2_FIELD_TOP ?
> -		  " top" : " bottom") : "none");
> +	if (!stable_output) {
> +		stream_ms = jiffies_to_msecs(get_jiffies_64() - ctx->capture_streamon_jiffies);
> +
> +		scnprintf(buf, bufsz,
> +			  "stream time: %02d:%02d:%02d:%03d sequence:%u timestamp:%lld field:%s",
> +			  (stream_ms / (60 * 60 * 1000)) % 24,
> +			  (stream_ms / (60 * 1000)) % 60,
> +			  (stream_ms / 1000) % 60,
> +			  stream_ms % 1000,

How useful is this 'stream time' anyway? I don't think this adds anything
useful.

> +			  run->dst->sequence,
> +			  run->dst->vb2_buf.timestamp,
> +			  (run->dst->field == V4L2_FIELD_ALTERNATE) ?
> +			  (run->dst->field == V4L2_FIELD_TOP ?
> +			  " top" : " bottom") : "none");
> +	} else {
> +		scnprintf(buf, bufsz,
> +			  "sequence:%u timestamp:%lld field:%s",
> +			  run->dst->sequence,
> +			  run->dst->vb2_buf.timestamp,
> +			  (run->dst->field == V4L2_FIELD_ALTERNATE) ?
> +			  (run->dst->field == V4L2_FIELD_TOP ?
> +			  " top" : " bottom") : "none");
> +
> +	}
>  }
>  
>  static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
> @@ -244,15 +255,17 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>  	frame_dprintk(ctx->dev, run->dst->sequence, "");
>  	line++;
>  
> -	visl_get_ref_frames(ctx, buf, TPG_STR_BUF_SZ, run);

This function shows both the ts of the ref frames and the buffer
index. Is it just the buffer index that causes the problem? If so,
then wouldn't it be better to either never show the buffer index
or only if !stable_output.

> +	if (!stable_output) {
> +		visl_get_ref_frames(ctx, buf, TPG_STR_BUF_SZ, run);
>  
> -	while ((line_str = strsep(&tmp, "\n")) && strlen(line_str)) {
> -		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, line_str);
> -		frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", line_str);
> -	}
> +		while ((line_str = strsep(&tmp, "\n")) && strlen(line_str)) {
> +			tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, line_str);
> +			frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", line_str);
> +		}
>  
> -	frame_dprintk(ctx->dev, run->dst->sequence, "");
> -	line++;
> +		frame_dprintk(ctx->dev, run->dst->sequence, "");
> +		line++;
> +	}
>  
>  	scnprintf(buf,
>  		  TPG_STR_BUF_SZ,
> @@ -280,28 +293,30 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>  		frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>  	}
>  
> -	line++;
> -	frame_dprintk(ctx->dev, run->dst->sequence, "");
> -	scnprintf(buf, TPG_STR_BUF_SZ, "Output queue status:");
> -	tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, buf);
> -	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
> +	if (!stable_output) {
> +		line++;
> +		frame_dprintk(ctx->dev, run->dst->sequence, "");
> +		scnprintf(buf, TPG_STR_BUF_SZ, "Output queue status:");
> +		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, buf);
> +		frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>  
> -	len = 0;
> -	for (i = 0; i < out_q->num_buffers; i++) {
> -		char entry[] = "index: %u, state: %s, request_fd: %d, ";
> -		u32 old_len = len;
> -		char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
> +		len = 0;
> +		for (i = 0; i < out_q->num_buffers; i++) {
> +			char entry[] = "index: %u, state: %s, request_fd: %d, ";
> +			u32 old_len = len;
> +			char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
>  
> -		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
> -				 entry, i, q_status,
> -				 to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
> +			len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
> +					 entry, i, q_status,
> +					 to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
>  
> -		len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
> -					   &buf[len],
> -					   TPG_STR_BUF_SZ - len);
> +			len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
> +						   &buf[len],
> +						   TPG_STR_BUF_SZ - len);
>  
> -		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
> -		frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
> +			tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
> +			frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
> +		}
>  	}
>  
>  	line++;
> @@ -333,25 +348,27 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>  		frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>  	}
>  
> -	line++;
> -	frame_dprintk(ctx->dev, run->dst->sequence, "");
> -	scnprintf(buf, TPG_STR_BUF_SZ, "Capture queue status:");
> -	tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, buf);
> -	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
> +	if (!stable_output) {
> +		line++;
> +		frame_dprintk(ctx->dev, run->dst->sequence, "");
> +		scnprintf(buf, TPG_STR_BUF_SZ, "Capture queue status:");
> +		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, buf);
> +		frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>  
> -	len = 0;
> -	for (i = 0; i < cap_q->num_buffers; i++) {
> -		u32 old_len = len;
> -		char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
> +		len = 0;
> +		for (i = 0; i < cap_q->num_buffers; i++) {
> +			u32 old_len = len;
> +			char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
>  
> -		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
> -				 "index: %u, status: %s, timestamp: %llu, is_held: %d",
> -				 cap_q->bufs[i]->index, q_status,
> -				 cap_q->bufs[i]->timestamp,
> -				 to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
> +			len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
> +					 "index: %u, status: %s, timestamp: %llu, is_held: %d",
> +					 cap_q->bufs[i]->index, q_status,
> +					 cap_q->bufs[i]->timestamp,
> +					 to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
>  
> -		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
> -		frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
> +			tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
> +			frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
> +		}
>  	}
>  }
>  
> diff --git a/drivers/media/test-drivers/visl/visl.h b/drivers/media/test-drivers/visl/visl.h
> index 31639f2e593d..5a81b493f121 100644
> --- a/drivers/media/test-drivers/visl/visl.h
> +++ b/drivers/media/test-drivers/visl/visl.h
> @@ -85,6 +85,7 @@ extern unsigned int visl_dprintk_nframes;
>  extern bool keep_bitstream_buffers;
>  extern int bitstream_trace_frame_start;
>  extern unsigned int bitstream_trace_nframes;
> +extern bool stable_output;
>  
>  #define frame_dprintk(dev, current, fmt, arg...) \
>  	do { \

Should stable_output perhaps be 1 by default?

Regards,

	Hans