linux-kernel - [PATCH] media: v4l-ctrl: add control for variable frame rate

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Date:   Wed, 20 Mar 2019 11:10:22 +0800
From:   Fish Lin <linfish@...gle.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Keiichi Watanabe <keiichiw@...omium.org>,
        Will Deacon <will.deacon@....com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Smitha T Murthy <smitha.t@...sung.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fish Lin <linfish@...gle.com>
Subject: [PATCH] media: v4l-ctrl: add control for variable frame rate

These flag are added
* V4L2_CID_MPEG_VIDEO_VFR_ENABLE
* V4L2_CID_MPEG_VIDEO_VFR_MIN_FRAMERATE
One is to set variable frame rate enable or not, another is to control
minimal frame rate that video encoder should keep per second.

Signed-off-by: Fish Lin <linfish@...gle.com>
---
 Documentation/media/uapi/v4l/ext-ctrls-codec.rst | 9 +++++++++
 drivers/media/v4l2-core/v4l2-ctrls.c             | 3 +++
 include/uapi/linux/v4l2-controls.h               | 3 +++
 3 files changed, 15 insertions(+)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
index c97fb7923be5..4bc013d71b67 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
@@ -620,7 +620,16 @@ enum v4l2_mpeg_video_bitrate_mode -
     * - Bit 24:31
       - Must be zero.
 
+.. _v4l2-mpeg-video-variable-framerate:
 
+``V4L2_CID_MPEG_VIDEO_VFR_ENABLE (boolean)``
+    Set variable framerate enable or not. When enabled, video encoder is able
+    to drop frames based on some mechanism, like frame similarity or bitrate
+    control (default disable).
+
+``V4L2_CID_MPEG_VIDEO_VFR_MIN_FRAMERATE (integer)``
+    Minimal kept frame per second when variable framerate is enabled (default
+    is input framerate).
 
 .. _v4l2-mpeg-video-dec-pts:
 
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index b79d3bbd8350..566c6552c9a0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -786,6 +786,8 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:			return "H264 MB Level Rate Control";
 	case V4L2_CID_MPEG_VIDEO_HEADER_MODE:			return "Sequence Header Mode";
 	case V4L2_CID_MPEG_VIDEO_MAX_REF_PIC:			return "Max Number of Reference Pics";
+	case V4L2_CID_MPEG_VIDEO_VFR_ENABLE:			return "Variable Frame Rate Enable";
+	case V4L2_CID_MPEG_VIDEO_VFR_MIN_FRAMERATE:		return "VFR Minimal Frame Rate";
 	case V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP:		return "H263 I-Frame QP Value";
 	case V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP:		return "H263 P-Frame QP Value";
 	case V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP:		return "H263 B-Frame QP Value";
@@ -1108,6 +1110,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE:
 	case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE:
 	case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE:
+	case V4L2_CID_MPEG_VIDEO_VFR_ENABLE:
 	case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM:
 	case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE:
 	case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL:
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 06479f2fb3ae..f1bf52eb0152 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -404,6 +404,9 @@ enum v4l2_mpeg_video_multi_slice_mode {
 #define V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE		(V4L2_CID_MPEG_BASE+228)
 #define V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME		(V4L2_CID_MPEG_BASE+229)
 
+#define V4L2_CID_MPEG_VIDEO_VFR_ENABLE (V4L2_CID_MPEG_BASE + 250)
+#define V4L2_CID_MPEG_VIDEO_VFR_MIN_FRAMERATE (V4L2_CID_MPEG_BASE + 251)
+
 #define V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP		(V4L2_CID_MPEG_BASE+300)
 #define V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP		(V4L2_CID_MPEG_BASE+301)
 #define V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP		(V4L2_CID_MPEG_BASE+302)
-- 
2.21.0.225.g810b269d1ac-goog