On Tue Mar 24 14:03:58 2026 +0900, Jackson Lee wrote:
> Implement V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION in the Wave5 encoder
> driver. When enabled, the hardware detects background regions in a frame
> and uses fewer bits or skip mode to encode them, reducing bitrate for
> streams with stationary scenes.
>
> Signed-off-by: Jackson Lee <[email protected]>
> Signed-off-by: Nas Chung <[email protected]>
> Reviewed-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Nicolas Dufresne <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/platform/chips-media/wave5/wave5-hw.c | 4 +++-
drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c | 7 +++++++
drivers/media/platform/chips-media/wave5/wave5-vpuapi.h | 1 +
3 files changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/platform/chips-media/wave5/wave5-hw.c
b/drivers/media/platform/chips-media/wave5/wave5-hw.c
index 687ce6ccf3ae..c516d125f553 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-hw.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-hw.c
@@ -49,6 +49,7 @@
#define FASTIO_ADDRESS_MASK GENMASK(15, 0)
#define SEQ_PARAM_PROFILE_MASK GENMASK(30, 24)
+#define SEQ_BG_PARAM_REG_DATA 0x3800410
static void _wave5_print_reg_err(struct vpu_device *vpu_dev, u32
reg_fail_reason,
const char *func);
@@ -1838,7 +1839,8 @@ int wave5_vpu_enc_init_seq(struct vpu_instance *inst)
vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_RC_BIT_RATIO_LAYER_4_7, 0);
vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_ROT_PARAM, rot_mir_mode);
- vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_BG_PARAM, 0);
+ vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_BG_PARAM,
+ SEQ_BG_PARAM_REG_DATA | p_param->bg_detection);
vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_CUSTOM_LAMBDA_ADDR, 0);
vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_CONF_WIN_TOP_BOT,
p_param->conf_win_bot << 16 | p_param->conf_win_top);
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
index c605a91718d8..e806973305ce 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
@@ -759,6 +759,9 @@ static int wave5_vpu_enc_s_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_MPEG_VIDEO_BITRATE:
inst->bit_rate = ctrl->val;
break;
+ case V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION:
+ inst->enc_param.bg_detection = ctrl->val;
+ break;
case V4L2_CID_MPEG_VIDEO_GOP_SIZE:
inst->enc_param.avc_idr_period = ctrl->val;
break;
@@ -1184,6 +1187,7 @@ static int wave5_set_enc_openparam(struct enc_open_param
*open_param,
open_param->wave_param.beta_offset_div2 = input.beta_offset_div2;
open_param->wave_param.decoding_refresh_type =
input.decoding_refresh_type;
open_param->wave_param.intra_period = input.intra_period;
+ open_param->wave_param.bg_detection = input.bg_detection;
if (inst->std == W_HEVC_ENC) {
if (input.intra_period == 0) {
open_param->wave_param.decoding_refresh_type =
DEC_REFRESH_TYPE_IDR;
@@ -1679,6 +1683,9 @@ static int wave5_vpu_open_enc(struct file *filp)
v4l2_ctrl_new_std(v4l2_ctrl_hdl, &wave5_vpu_enc_ctrl_ops,
V4L2_CID_MPEG_VIDEO_AU_DELIMITER,
0, 1, 1, 1);
+ v4l2_ctrl_new_std(v4l2_ctrl_hdl, &wave5_vpu_enc_ctrl_ops,
+ V4L2_CID_MPEG_VIDEO_BACKGROUND_DETECTION,
+ 0, 1, 1, 0);
v4l2_ctrl_new_std(v4l2_ctrl_hdl, &wave5_vpu_enc_ctrl_ops,
V4L2_CID_HFLIP,
0, 1, 1, 0);
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
index c64135769869..dc31689e0d27 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
@@ -570,6 +570,7 @@ struct enc_wave_param {
u32 transform8x8_enable: 1; /* enable 8x8 intra prediction and 8x8
transform */
u32 mb_level_rc_enable: 1; /* enable MB-level rate control */
u32 forced_idr_header_enable: 1; /* enable header encoding before IDR
frame */
+ u32 bg_detection: 1; /* enable background detection */
};
struct enc_open_param {
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