Got it, I'll submit another patch after your patch merged. Thanks, Fish Hans Verkuil <hverkuil-cisco@xxxxxxxxx> 於 2019年2月8日 週五 下午5:58寫道： > > On 1/30/19 10:11 AM, Fish Lin wrote: > > 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@xxxxxxxxxx> > > --- > > Changelog since v2: > > - Add interaction with V4L2_CID_MPEG_VIDEO_H264_MIN/MAX_QP > > description in the document. > > > > Changelog since v1: > > - Add description in document. > > > > .../media/uapi/v4l/extended-controls.rst | 24 +++++++++++++++++++ > > drivers/media/v4l2-core/v4l2-ctrls.c | 4 ++++ > > include/uapi/linux/v4l2-controls.h | 6 +++++ > > 3 files changed, 34 insertions(+) > > > > diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst > > index 286a2dd7ec36..402e41eb24ee 100644 > > --- a/Documentation/media/uapi/v4l/extended-controls.rst > > +++ b/Documentation/media/uapi/v4l/extended-controls.rst > > @@ -1214,6 +1214,30 @@ 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 H264 I frame, to limit I frame > > + quality in a range. Valid range: from 0 to 51. If > > + V4L2_CID_MPEG_VIDEO_H264_MIN_QP is set, the quantization parameter > > is set -> is also set > > > + should be chosen to meet both of the requirement. > > both of the requirement -> both requirements > > Ditto for the other three controls below. > > However, you might want to wait a little bit since I have this patch pending: > > https://patchwork.linuxtv.org/patch/54388/ > > which will require a rebase of your patch anyway. > > Regards, > > Hans > > > + > > +``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (integer)`` > > + Maximum quantization parameter for H264 I frame, to limit I frame > > + quality in a range. Valid range: from 0 to 51. If > > + V4L2_CID_MPEG_VIDEO_H264_MAX_QP is set, the quantization parameter > > + should be chosen to meet both of the requirement. > > + > > +``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (integer)`` > > + Minimum quantization parameter for H264 P frame, to limit P frame > > + quality in a range. Valid range: from 0 to 51. If > > + V4L2_CID_MPEG_VIDEO_H264_MIN_QP is set, the quantization parameter > > + should be chosen to meet both of the requirement. > > + > > +``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (integer)`` > > + Maximum quantization parameter for H264 P frame, to limit P frame > > + quality in a range. Valid range: from 0 to 51. If > > + V4L2_CID_MPEG_VIDEO_H264_MAX_QP is set, the quantization parameter > > + should be chosen to meet both of the requirement. > > + > > ``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 5e3806feb5d7..e2b0af0d2283 100644 > > --- a/drivers/media/v4l2-core/v4l2-ctrls.c > > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c > > @@ -825,6 +825,10 @@ const char *v4l2_ctrl_get_name(u32 id) > > case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of HC Layers"; > > case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP: > > return "H264 Set QP Value for HC Layers"; > > + 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 3dcfc6148f99..9519673e6437 100644 > > --- a/include/uapi/linux/v4l2-controls.h > > +++ b/include/uapi/linux/v4l2-controls.h > > @@ -533,6 +533,12 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type { > > }; > > #define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER (V4L2_CID_MPEG_BASE+381) > > #define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP (V4L2_CID_MPEG_BASE+382) > > + > > +#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+390) > > +#define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+391) > > +#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+392) > > +#define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+393) > > + > > #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) > > >
