[media] saa7164: allow the IBP reference distance to be configurable

Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/saa7164/saa7164-api.c

@@ -32,7 +32,7 @@ int saa7164_api_set_gop_size(struct saa7164_port *port)
 
 	dprintk(DBGLVL_ENC, "%s()\n", __func__);
 
-	gs.ucRefFrameDist = SAA7164_ENCODER_DEFAULT_GOP_DIST;
+	gs.ucRefFrameDist = port->encoder_params.refdist;
 	gs.ucGOPSize = SAA7164_ENCODER_DEFAULT_GOP_SIZE;
 	ret = saa7164_cmd_send(port->dev, port->hwcfg.sourceid, SET_CUR,
 		EU_VIDEO_GOP_STRUCTURE_CONTROL,

drivers/media/video/saa7164/saa7164-encoder.c

@@ -47,6 +47,7 @@ static const u32 saa7164_v4l2_ctrls[] = {
 	V4L2_CID_MPEG_AUDIO_MUTE,
 	V4L2_CID_MPEG_VIDEO_BITRATE_MODE,
 	V4L2_CID_MPEG_VIDEO_BITRATE,
+	V4L2_CID_MPEG_VIDEO_B_FRAMES,
 	0
 };
 
@@ -383,6 +384,9 @@ static int saa7164_get_ctrl(struct saa7164_port *port,
 	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 		ctrl->value = params->bitrate_mode;
 		break;
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
+		ctrl->value = params->refdist;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -447,6 +451,11 @@ static int saa7164_try_ctrl(struct v4l2_ext_control *ctrl, int ac3)
 			(ctrl->value == V4L2_MPEG_VIDEO_BITRATE_MODE_CBR))
 			ret = 0;
 		break;
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
+		if ((ctrl->value >= 1) &&
+			(ctrl->value <= 3))
+			ret = 0;
+		break;
 	default:
 		ret = -EINVAL;
 	}
@@ -509,6 +518,9 @@ static int saa7164_set_ctrl(struct saa7164_port *port,
 	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
 		params->bitrate_mode = ctrl->value;
 		break;
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
+		params->refdist = ctrl->value;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -683,6 +695,9 @@ static int fill_queryctrl(struct saa7164_encoder_params *params,
 		return v4l2_ctrl_query_fill(c,
 			V4L2_MPEG_VIDEO_BITRATE_MODE_VBR, V4L2_MPEG_VIDEO_BITRATE_MODE_CBR,
 			1, V4L2_MPEG_VIDEO_BITRATE_MODE_VBR);
+	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
+		return v4l2_ctrl_query_fill(c,
+			1, 3, 1, 1);
 	default:
 		return -EINVAL;
 	}
@@ -1307,6 +1322,7 @@ int saa7164_encoder_register(struct saa7164_port *port)
 	port->encoder_params.stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_PS;
 	port->encoder_params.ctl_mute = 0;
 	port->encoder_params.ctl_aspect = V4L2_MPEG_VIDEO_ASPECT_4x3;
+	port->encoder_params.refdist = 1;
 
 	if (port->encodernorm.id & V4L2_STD_525_60)
 		port->height = 480;

drivers/media/video/saa7164/saa7164.h

@@ -261,6 +261,7 @@ struct saa7164_encoder_params {
 	u32 audio_sampling_freq;
 	u32 ctl_mute;
 	u32 ctl_aspect;
+	u32 refdist;
 };
 
 struct saa7164_port;