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| author | Fish Lin | 2019-03-29 04:20:46 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2019-04-22 16:25:36 +0200 |
| commit | 87effaae9e90474546d441b9123bca824e670a0b (patch) | |
| tree | a31c6bc888cab7395bb61e8288db27a2d8f2d1a4 | |
| parent | media: index.rst: exclude Indexes section from latex/pdf output (diff) | |
| download | kernel-qcow2-linux-87effaae9e90474546d441b9123bca824e670a0b.tar.gz kernel-qcow2-linux-87effaae9e90474546d441b9123bca824e670a0b.tar.xz kernel-qcow2-linux-87effaae9e90474546d441b9123bca824e670a0b.zip | |
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>
| -rw-r--r-- | Documentation/media/uapi/v4l/ext-ctrls-codec.rst | 24 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ctrls.c | 4 | ||||
| -rw-r--r-- | include/uapi/linux/v4l2-controls.h | 4 |
3 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst index 67a122339c0e..4a8446203085 100644 --- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst +++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst @@ -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. diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index b1ae2e555c68..89a1fe564675 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -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"; diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h index 78816ec88751..37807f23231e 100644 --- a/include/uapi/linux/v4l2-controls.h +++ b/include/uapi/linux/v4l2-controls.h @@ -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) |