From: Jonas Karlman <jonas@xxxxxxxxx> Using the field information attached to v4l2 buffers is not enough to determine the type of field referenced by a DPB entry: the decoded frame might contain the full picture (both top and bottom fields) but the reference only point to one of them. Let's add new V4L2_H264_DPB_ENTRY_FLAG_ flags to express that. Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx> [Keep only 2 flags and add some details about they mean] Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> --- Changes in v3: * This patch was previously part of https://lkml.org/lkml/2019/10/28/956 * Kept the FIELD and BOTTOM_FIELD flags * Updated the doc with more details --- Documentation/media/uapi/v4l/ext-ctrls-codec.rst | 16 ++++++++++++++++ include/media/h264-ctrls.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst index 28313c0f4e7c..d4fc5f25aa14 100644 --- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst +++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst @@ -2028,6 +2028,22 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - * - ``V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM`` - 0x00000004 - The DPB entry is a long term reference frame + * - ``V4L2_H264_DPB_ENTRY_FLAG_FIELD`` + - 0x00000008 + - The DPB entry is a field reference, which means only one of the field + will be used when decoding the new frame/field. When not set the DPB + entry is a frame reference (both fields will be used). Note that this + flag does not say anything about the number of fields contained in the + reference frame, it just describes the one used to decode the new + field/frame + * - ``V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD`` + - 0x00000010 + - The DPB entry is a bottom field reference (only the bottom field of the + reference frame is needed to decode the new frame/field). Only valid if + V4L2_H264_DPB_ENTRY_FLAG_FIELD is set. When + V4L2_H264_DPB_ENTRY_FLAG_FIELD is set but + V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD is not, that means the + DPB entry is a top field reference ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE (enum)`` Specifies the decoding mode to use. Currently exposes slice-based and diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h index e877bf1d537c..1c6ff7d63bca 100644 --- a/include/media/h264-ctrls.h +++ b/include/media/h264-ctrls.h @@ -185,6 +185,8 @@ struct v4l2_ctrl_h264_slice_params { #define V4L2_H264_DPB_ENTRY_FLAG_VALID 0x01 #define V4L2_H264_DPB_ENTRY_FLAG_ACTIVE 0x02 #define V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM 0x04 +#define V4L2_H264_DPB_ENTRY_FLAG_FIELD 0x08 +#define V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD 0x10 struct v4l2_h264_dpb_entry { __u64 reference_ts; -- 2.23.0
