If V4L2_CID_MPEG_VIDEO_ENC_SKIP_FRAMES control is enabled encoder can drop frames, if required, to achieve target bitrate instead of modifying the quantization parameter which lowers the encoded frame quality. Reference: 4.3.8.1 OMX_Video_ControlRateConstantSkipFrames https://www.khronos.org/registry/OpenMAX-IL/specs/OpenMAX_IL_1_1_2_Specification.pdf Signed-off-by: Maheshwar Ajja <majja@xxxxxxxxxxxxxx> --- Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 7 +++++++ drivers/media/v4l2-core/v4l2-ctrls.c | 2 ++ include/uapi/linux/v4l2-controls.h | 1 + 3 files changed, 10 insertions(+) diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index d0d506a..bc9265d 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1081,6 +1081,13 @@ enum v4l2_mpeg_video_h264_entropy_mode - Macroblock level rate control enable. Applicable to the MPEG4 and H264 encoders. +``V4L2_CID_MPEG_VIDEO_ENC_SKIP_FRAMES (boolean)`` + Encoder skip frames enable. This control is applicable only if + ``V4L2_CID_MPEG_VIDEO_BITRATE_MODE`` control is set. If this control + is enabled encoder can drop frames, if required, to achieve target + bitrate instead of modifying the quantization parameter which lowers + the encoded frame quality. + ``V4L2_CID_MPEG_VIDEO_MPEG4_QPEL (boolean)`` Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder. diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index 1c617b4..d2cb766 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -914,6 +914,7 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_FWHT_PARAMS: return "FWHT Stateless Parameters"; case V4L2_CID_FWHT_I_FRAME_QP: return "FWHT I-Frame QP Value"; case V4L2_CID_FWHT_P_FRAME_QP: return "FWHT P-Frame QP Value"; + case V4L2_CID_MPEG_VIDEO_ENC_SKIP_FRAMES: return "Encoder Skip Frames"; /* VPX controls */ case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS: return "VPX Number of Partitions"; @@ -1180,6 +1181,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, case V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE: case V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE: case V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE: + case V4L2_CID_MPEG_VIDEO_ENC_SKIP_FRAMES: case V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM: case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: case V4L2_CID_MPEG_VIDEO_MPEG4_QPEL: diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h index 0ba1005..d3bc015 100644 --- a/include/uapi/linux/v4l2-controls.h +++ b/include/uapi/linux/v4l2-controls.h @@ -742,6 +742,7 @@ 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_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_ENC_SKIP_FRAMES (V4L2_CID_MPEG_BASE + 645) /* MPEG-class control IDs specific to the CX2341x driver as defined by V4L2 */ #define V4L2_CID_MPEG_CX2341X_BASE (V4L2_CTRL_CLASS_MPEG | 0x1000) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
