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[media] coda: add h.264 min/max qp controls 

If the bitrate control is set, the encoder works in CBR mode, dynamically
changing the quantization parameters to achieve a constant bitrate.
With the min/max QP controls the quantization parameters can be limited
to a given range.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Philipp Zabel 2014-07-11 06:36:26 -03:00 committed by Mauro Carvalho Chehab
parent 39b06acc5f
commit 1a5567e3e0
1 changed files with 27 additions and 0 deletions
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27
drivers/media/platform/coda.c
View File

@ -159,6 +159,8 @@ struct coda_params {
u8 rot_mode;
u8 h264_intra_qp;
u8 h264_inter_qp;
u8 h264_min_qp;
u8 h264_max_qp;
u8 mpeg4_intra_qp;
u8 mpeg4_inter_qp;
u8 gop_size;
@ -2379,7 +2381,16 @@ static int coda_start_encoding(struct coda_ctx *ctx)
coda_write(dev, (gamma & CODA_GAMMA_MASK) << CODA_GAMMA_OFFSET,
CODA_CMD_ENC_SEQ_RC_GAMMA);
}
if (ctx->params.h264_min_qp || ctx->params.h264_max_qp) {
coda_write(dev,
ctx->params.h264_min_qp << CODA_QPMIN_OFFSET |
ctx->params.h264_max_qp << CODA_QPMAX_OFFSET,
CODA_CMD_ENC_SEQ_RC_QP_MIN_MAX);
}
if (dev->devtype->product == CODA_960) {
if (ctx->params.h264_max_qp)
value |= 1 << CODA9_OPTION_RCQPMAX_OFFSET;
if (CODA_DEFAULT_GAMMA > 0)
value |= 1 << CODA9_OPTION_GAMMA_OFFSET;
} else {
@ -2389,6 +2400,10 @@ static int coda_start_encoding(struct coda_ctx *ctx)
else
value |= 1 << CODA7_OPTION_GAMMA_OFFSET;
}
if (ctx->params.h264_min_qp)
value |= 1 << CODA7_OPTION_RCQPMIN_OFFSET;
if (ctx->params.h264_max_qp)
value |= 1 << CODA7_OPTION_RCQPMAX_OFFSET;
}
coda_write(dev, value, CODA_CMD_ENC_SEQ_OPTION);
@ -2617,6 +2632,12 @@ static int coda_s_ctrl(struct v4l2_ctrl *ctrl)
case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP:
ctx->params.h264_inter_qp = ctrl->val;
break;
case V4L2_CID_MPEG_VIDEO_H264_MIN_QP:
ctx->params.h264_min_qp = ctrl->val;
break;
case V4L2_CID_MPEG_VIDEO_H264_MAX_QP:
ctx->params.h264_max_qp = ctrl->val;
break;
case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP:
ctx->params.mpeg4_intra_qp = ctrl->val;
break;
@ -2664,6 +2685,12 @@ static int coda_ctrls_setup(struct coda_ctx *ctx)
V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP, 0, 51, 1, 25);
v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP, 0, 51, 1, 25);
if (ctx->dev->devtype->product != CODA_960) {
v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
V4L2_CID_MPEG_VIDEO_H264_MIN_QP, 0, 51, 1, 12);
}
v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
V4L2_CID_MPEG_VIDEO_H264_MAX_QP, 0, 51, 1, 51);
v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,
V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP, 1, 31, 1, 2);
v4l2_ctrl_new_std(&ctx->ctrls, &coda_ctrl_ops,