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media: v4l2-ctrl: Add frame-skip std encoder control

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Adds encoders standard v4l2 control for frame-skip. The control
is a copy of a custom encoder control so that other v4l2 encoder
drivers can use it.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Stanimir Varbanov 2020-07-05 01:41:00 +02:00 committed by Mauro Carvalho Chehab
parent 69ff4b2caa
commit 44f5b2fffc
3 changed files with 54 additions and 0 deletions
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38
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
View File

@ -602,6 +602,40 @@ enum v4l2_mpeg_video_bitrate_mode -
Encoder will decide the appropriate quantization parameter and
bitrate to produce requested frame quality.
``V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE (enum)``
enum v4l2_mpeg_video_frame_skip_mode -
Indicates in what conditions the encoder should skip frames. If
encoding a frame would cause the encoded stream to be larger then a
chosen data limit then the frame will be skipped. Possible values
are:
.. tabularcolumns:: |p{9.2cm}|p{8.3cm}|
.. raw:: latex
\small
.. flat-table::
:header-rows: 0
:stub-columns: 0
* - ``V4L2_MPEG_FRAME_SKIP_MODE_DISABLED``
- Frame skip mode is disabled.
* - ``V4L2_MPEG_FRAME_SKIP_MODE_LEVEL_LIMIT``
- Frame skip mode enabled and buffer limit is set by the chosen
level and is defined by the standard.
* - ``V4L2_MPEG_FRAME_SKIP_MODE_BUF_LIMIT``
- Frame skip mode enabled and buffer limit is set by the
:ref:`VBV (MPEG1/2/4) <v4l2-mpeg-video-vbv-size>` or
:ref:`CPB (H264) buffer size <v4l2-mpeg-video-h264-cpb-size>` control.
.. raw:: latex
\normalsize
``V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION (integer)``
For every captured frame, skip this many subsequent frames (default
0).
@ -1173,6 +1207,8 @@ enum v4l2_mpeg_video_h264_entropy_mode -
Quantization parameter for an B frame for MPEG4. Valid range: from 1
to 31.
.. _v4l2-mpeg-video-vbv-size:
``V4L2_CID_MPEG_VIDEO_VBV_SIZE (integer)``
The Video Buffer Verifier size in kilobytes, it is used as a
limitation of frame skip. The VBV is defined in the standard as a
@ -1210,6 +1246,8 @@ enum v4l2_mpeg_video_h264_entropy_mode -
Force a key frame for the next queued buffer. Applicable to
encoders. This is a general, codec-agnostic keyframe control.
.. _v4l2-mpeg-video-h264-cpb-size:
``V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE (integer)``
The Coded Picture Buffer size in kilobytes, it is used as a
limitation of frame skip. The CPB is defined in the H264 standard as

10
drivers/media/v4l2-core/v4l2-ctrls.c
View File

@ -591,6 +591,12 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
"External",
NULL,
};
static const char * const mpeg_video_frame_skip[] = {
"Disabled",
"Level Limit",
"VBV/CPB Limit",
NULL,
};
switch (id) {
case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
@ -652,6 +658,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
return flash_strobe_source;
case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
return header_mode;
case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
return mpeg_video_frame_skip;
case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
return multi_slice;
case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
@ -846,6 +854,7 @@ 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_FRAME_SKIP_MODE: return "Frame Skip Mode";
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";
@ -1268,6 +1277,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_FLASH_LED_MODE:
case V4L2_CID_FLASH_STROBE_SOURCE:
case V4L2_CID_MPEG_VIDEO_HEADER_MODE:
case V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE:
case V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE:
case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
case V4L2_CID_MPEG_VIDEO_H264_LEVEL:

6
include/uapi/linux/v4l2-controls.h
View File

@ -744,6 +744,12 @@ enum v4l2_cid_mpeg_video_hevc_size_of_length_field {
#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_CONSTANT_QUALITY (V4L2_CID_MPEG_BASE + 645)
#define V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE (V4L2_CID_MPEG_BASE + 646)
enum v4l2_mpeg_video_frame_skip_mode {
V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_DISABLED = 0,
V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_LEVEL_LIMIT = 1,
V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_BUF_LIMIT = 2,
};
/* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */
#define V4L2_CID_MPEG_CX2341X_BASE (V4L2_CTRL_CLASS_MPEG | 0x1000)