V4L/DVB (5271): Add VIDIOC_TRY_ENCODER_CMD and VIDIOC_ENCODER_CMD ioctls.

Add support for starting, stopping, pausing and resuming an MPEG (or similar
compressed stream) encoder.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/v4l2-common.c

@@ -374,7 +374,9 @@ static const char *v4l2_ioctls[] = {
 #if 1
 	[_IOC_NR(VIDIOC_ENUM_FRAMESIZES)]  = "VIDIOC_ENUM_FRAMESIZES",
 	[_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
-	[_IOC_NR(VIDIOC_G_ENC_INDEX)] 	   = "VIDIOC_G_ENC_INDEX"
+	[_IOC_NR(VIDIOC_G_ENC_INDEX)] 	   = "VIDIOC_G_ENC_INDEX",
+	[_IOC_NR(VIDIOC_ENCODER_CMD)] 	   = "VIDIOC_ENCODER_CMD",
+	[_IOC_NR(VIDIOC_TRY_ENCODER_CMD)]  = "VIDIOC_TRY_ENCODER_CMD"
 #endif
 };
 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)

drivers/media/video/videodev.c

@@ -1354,6 +1354,30 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
 					p->entries,p->entries_cap);
 		break;
 	}
+	case VIDIOC_ENCODER_CMD:
+	{
+		struct v4l2_encoder_cmd *p=arg;
+
+		if (!vfd->vidioc_encoder_cmd)
+			break;
+		ret=vfd->vidioc_encoder_cmd(file, fh, p);
+		if (!ret)
+			dbgarg (cmd, "cmd=%d, flags=%d\n",
+					p->cmd,p->flags);
+		break;
+	}
+	case VIDIOC_TRY_ENCODER_CMD:
+	{
+		struct v4l2_encoder_cmd *p=arg;
+
+		if (!vfd->vidioc_try_encoder_cmd)
+			break;
+		ret=vfd->vidioc_try_encoder_cmd(file, fh, p);
+		if (!ret)
+			dbgarg (cmd, "cmd=%d, flags=%d\n",
+					p->cmd,p->flags);
+		break;
+	}
 	case VIDIOC_G_PARM:
 	{
 		struct v4l2_streamparm *p=arg;

include/linux/videodev2.h

@@ -1193,7 +1193,7 @@ struct v4l2_audioout
 };
 
 /*
- *	M P E G   I N D E X
+ *	M P E G   S E R V I C E S
  *
  *	NOTE: EXPERIMENTAL API
  */
@@ -1218,6 +1218,26 @@ struct v4l2_enc_idx {
 	__u32 reserved[4];
 	struct v4l2_enc_idx_entry entry[V4L2_ENC_IDX_ENTRIES];
 };
+
+
+#define V4L2_ENC_CMD_START      (0)
+#define V4L2_ENC_CMD_STOP       (1)
+#define V4L2_ENC_CMD_PAUSE      (2)
+#define V4L2_ENC_CMD_RESUME     (3)
+
+/* Flags for V4L2_ENC_CMD_STOP */
+#define V4L2_ENC_CMD_STOP_AT_GOP_END    (1 << 0)
+
+struct v4l2_encoder_cmd {
+	__u32 cmd;
+	__u32 flags;
+	union {
+		struct {
+			__u32 data[8];
+		} raw;
+	};
+};
+
 #endif
 
 
@@ -1415,6 +1435,8 @@ struct v4l2_register {
 #define VIDIOC_ENUM_FRAMESIZES	_IOWR ('V', 74, struct v4l2_frmsizeenum)
 #define VIDIOC_ENUM_FRAMEINTERVALS	_IOWR ('V', 75, struct v4l2_frmivalenum)
 #define VIDIOC_G_ENC_INDEX      _IOR  ('V', 76, struct v4l2_enc_idx)
+#define VIDIOC_ENCODER_CMD      _IOWR ('V', 77, struct v4l2_encoder_cmd)
+#define VIDIOC_TRY_ENCODER_CMD  _IOWR ('V', 78, struct v4l2_encoder_cmd)
 #endif
 /* only implemented if CONFIG_VIDEO_ADV_DEBUG is defined */
 #define	VIDIOC_DBG_S_REGISTER 	_IOW ('d', 100, struct v4l2_register)

include/media/v4l2-dev.h

@@ -273,6 +273,10 @@ struct video_device
 					struct v4l2_jpegcompression *a);
 	int (*vidioc_g_enc_index)      (struct file *file, void *fh,
 					struct v4l2_enc_idx *a);
+	int (*vidioc_encoder_cmd)      (struct file *file, void *fh,
+					struct v4l2_encoder_cmd *a);
+	int (*vidioc_try_encoder_cmd)  (struct file *file, void *fh,
+					struct v4l2_encoder_cmd *a);
 
 	/* Stream type-dependent parameter ioctls */
 	int (*vidioc_g_parm)           (struct file *file, void *fh,