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media: v4l: add I / P frame min max QP definitions 

Add following V4L2 QP parameters for H.264:
* V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP
* V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP
* V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP
* V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP

These controls will limit QP range for intra and inter frame,
provide more manual control to improve video encode quality.

Signed-off-by: Fish Lin <linfish@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Fish Lin 2019-03-28 23:20:46 -04:00 committed by Mauro Carvalho Chehab
parent 1c3ec30bb2
commit 87effaae9e
3 changed files with 32 additions and 0 deletions
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24
Documentation/media/uapi/v4l/ext-ctrls-codec.rst
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@ -1055,6 +1055,30 @@ enum v4l2_mpeg_video_h264_entropy_mode -
Quantization parameter for an B frame for H264. Valid range: from 0
to 51.
``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP (integer)``
Minimum quantization parameter for the H264 I frame to limit I frame
quality to a range. Valid range: from 0 to 51. If
V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter
should be chosen to meet both requirements.
``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (integer)``
Maximum quantization parameter for the H264 I frame to limit I frame
quality to a range. Valid range: from 0 to 51. If
V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
should be chosen to meet both requirements.
``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (integer)``
Minimum quantization parameter for the H264 P frame to limit P frame
quality to a range. Valid range: from 0 to 51. If
V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter
should be chosen to meet both requirements.
``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (integer)``
Maximum quantization parameter for the H264 P frame to limit P frame
quality to a range. Valid range: from 0 to 51. If
V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
should be chosen to meet both requirements.
``V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (integer)``
Quantization parameter for an I frame for MPEG4. Valid range: from 1
to 31.

4
drivers/media/v4l2-core/v4l2-ctrls.c
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@ -828,6 +828,10 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
return "H264 Constrained Intra Pred";
case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP: return "H264 I-Frame Minimum QP Value";
case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value";
case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value";
case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value";
case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";

4
include/uapi/linux/v4l2-controls.h
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@ -539,6 +539,10 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type {
#define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP (V4L2_CID_MPEG_BASE+382)
#define V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION (V4L2_CID_MPEG_BASE+383)
#define V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET (V4L2_CID_MPEG_BASE+384)
#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+385)
#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+386)
#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+387)
#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+388)
#define V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (V4L2_CID_MPEG_BASE+400)
#define V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP (V4L2_CID_MPEG_BASE+401)
#define V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP (V4L2_CID_MPEG_BASE+402)