linux-kernel - [RFC PATCH] [media] coda: Use S_PARM to set nominal framerate for h.264 encoder

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Date:	Mon, 22 Dec 2014 17:00:00 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Kamil Debski <k.debski@...sung.com>
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frédéric Sureau 
	<frederic.sureau@...alys.com>,
	Jean-Michel Hautbois <jean-michel.hautbois@...alys.com>,
	Nicolas Dufresne <nicolas.dufresne@...labora.com>,
	Philipp Zabel <p.zabel@...gutronix.de>
Subject: [RFC PATCH] [media] coda: Use S_PARM to set nominal framerate for h.264 encoder

The encoder needs to know the nominal framerate for the constant bitrate
control mechanism to work. Currently the only way to set the framerate is
by using VIDIOC_S_PARM on the output queue.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
---
 drivers/media/platform/coda/coda-common.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 39330a7..63eb510 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -803,6 +803,32 @@ static int coda_decoder_cmd(struct file *file, void *fh,
 	return 0;
 }
 
+static int coda_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct coda_ctx *ctx = fh_to_ctx(fh);
+
+	a->parm.output.timeperframe.denominator = 1;
+	a->parm.output.timeperframe.numerator = ctx->params.framerate;
+
+	return 0;
+}
+
+static int coda_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+	struct coda_ctx *ctx = fh_to_ctx(fh);
+
+	if (a->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
+	    a->parm.output.timeperframe.numerator != 0) {
+		ctx->params.framerate = a->parm.output.timeperframe.denominator
+				      / a->parm.output.timeperframe.numerator;
+	}
+
+	a->parm.output.timeperframe.denominator = 1;
+	a->parm.output.timeperframe.numerator = ctx->params.framerate;
+
+	return 0;
+}
+
 static int coda_subscribe_event(struct v4l2_fh *fh,
 				const struct v4l2_event_subscription *sub)
 {
@@ -843,6 +869,9 @@ static const struct v4l2_ioctl_ops coda_ioctl_ops = {
 	.vidioc_try_decoder_cmd	= coda_try_decoder_cmd,
 	.vidioc_decoder_cmd	= coda_decoder_cmd,
 
+	.vidioc_g_parm		= coda_g_parm,
+	.vidioc_s_parm		= coda_s_parm,
+
 	.vidioc_subscribe_event = coda_subscribe_event,
 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 };
-- 
2.1.4

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