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media: v4l2-ctrls: Add encoder constant quality control 

When V4L2_CID_MPEG_VIDEO_BITRATE_MODE value is
V4L2_MPEG_VIDEO_BITRATE_MODE_CQ, encoder will produce
constant quality output indicated by
V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY control value.
Encoder will choose appropriate quantization parameter
and bitrate to produce requested frame quality level.

Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Maheshwar Ajja 2020-05-23 03:05:26 +02:00 committed by Mauro Carvalho Chehab
parent 73d513e45a
commit 4ad1b0d410
3 changed files with 14 additions and 0 deletions
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10
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
View File

@ -581,6 +581,8 @@ enum v4l2_mpeg_video_bitrate_mode -
- Variable bitrate - Variable bitrate
* - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CBR`` * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CBR``
- Constant bitrate - Constant bitrate
* - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CQ``
- Constant quality
@ -592,6 +594,14 @@ enum v4l2_mpeg_video_bitrate_mode -
the average video bitrate. It is ignored if the video bitrate mode the average video bitrate. It is ignored if the video bitrate mode
is set to constant bitrate. is set to constant bitrate.
``V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY (integer)``
Constant quality level control. This control is applicable when
``V4L2_CID_MPEG_VIDEO_BITRATE_MODE`` value is
``V4L2_MPEG_VIDEO_BITRATE_MODE_CQ``. Valid range is 1 to 100
where 1 indicates lowest quality and 100 indicates highest quality.
Encoder will decide the appropriate quantization parameter and
bitrate to produce requested frame quality.
``V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION (integer)`` ``V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION (integer)``
For every captured frame, skip this many subsequent frames (default For every captured frame, skip this many subsequent frames (default
0). 0).

2
drivers/media/v4l2-core/v4l2-ctrls.c
View File

@ -200,6 +200,7 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
static const char * const mpeg_video_bitrate_mode[] = { static const char * const mpeg_video_bitrate_mode[] = {
"Variable Bitrate", "Variable Bitrate",
"Constant Bitrate", "Constant Bitrate",
"Constant Quality",
NULL NULL
}; };
static const char * const mpeg_stream_type[] = { static const char * const mpeg_stream_type[] = {
@ -832,6 +833,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure"; case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure";
case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown"; case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown";
case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode"; case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode";
case V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY: return "Constant Quality";
case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate"; case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate";
case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate"; case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate";
case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation"; case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";

2
include/uapi/linux/v4l2-controls.h
View File

@ -375,6 +375,7 @@ enum v4l2_mpeg_video_aspect {
enum v4l2_mpeg_video_bitrate_mode { enum v4l2_mpeg_video_bitrate_mode {
V4L2_MPEG_VIDEO_BITRATE_MODE_VBR = 0, V4L2_MPEG_VIDEO_BITRATE_MODE_VBR = 0,
V4L2_MPEG_VIDEO_BITRATE_MODE_CBR = 1, V4L2_MPEG_VIDEO_BITRATE_MODE_CBR = 1,
V4L2_MPEG_VIDEO_BITRATE_MODE_CQ = 2,
}; };
#define V4L2_CID_MPEG_VIDEO_BITRATE (V4L2_CID_MPEG_BASE+207) #define V4L2_CID_MPEG_VIDEO_BITRATE (V4L2_CID_MPEG_BASE+207)
#define V4L2_CID_MPEG_VIDEO_BITRATE_PEAK (V4L2_CID_MPEG_BASE+208) #define V4L2_CID_MPEG_VIDEO_BITRATE_PEAK (V4L2_CID_MPEG_BASE+208)
@ -742,6 +743,7 @@ enum v4l2_cid_mpeg_video_hevc_size_of_length_field {
#define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR (V4L2_CID_MPEG_BASE + 642) #define V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR (V4L2_CID_MPEG_BASE + 642)
#define V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES (V4L2_CID_MPEG_BASE + 643) #define V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES (V4L2_CID_MPEG_BASE + 643)
#define V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (V4L2_CID_MPEG_BASE + 644) #define V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (V4L2_CID_MPEG_BASE + 644)
#define V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY (V4L2_CID_MPEG_BASE + 645)
/* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */ /* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */
#define V4L2_CID_MPEG_CX2341X_BASE (V4L2_CTRL_CLASS_MPEG | 0x1000) #define V4L2_CID_MPEG_CX2341X_BASE (V4L2_CTRL_CLASS_MPEG | 0x1000)