--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/sys/v4l/videodev_mjpeg.h Wed Sep 01 12:16:41 2010 +0100
@@ -0,0 +1,123 @@
+/* These are the MJPEG API extensions for the Video4Linux API,
+ first introduced by the Iomega Buz driver by Rainer Johanni
+ <rainer@johanni.de>
+*/
+
+#ifndef __VIDEODEV_MJPEG_H__
+#define __VIDEODEV_MJPEG_H__
+
+/* This is identical with the mgavideo internal params struct,
+ please tell me if you change this struct here ! <gz@lysator.liu.se) */
+struct mjpeg_params
+{
+
+ /* The following parameters can only be queried */
+
+ int major_version; /* Major version number of driver */
+ int minor_version; /* Minor version number of driver */
+
+ /* Main control parameters */
+
+ int input; /* Input channel: 0 = Composite, 1 = S-VHS */
+ int norm; /* Norm: VIDEO_MODE_PAL or VIDEO_MODE_NTSC */
+ int decimation; /* decimation of captured video,
+ enlargement of video played back.
+ Valid values are 1, 2, 4 or 0.
+ 0 is a special value where the user
+ has full control over video scaling */
+
+ /* The following parameters only have to be set if decimation==0,
+ for other values of decimation they provide the data how the image is captured */
+
+ int HorDcm; /* Horizontal decimation: 1, 2 or 4 */
+ int VerDcm; /* Vertical decimation: 1 or 2 */
+ int TmpDcm; /* Temporal decimation: 1 or 2,
+ if TmpDcm==2 in capture every second frame is dropped,
+ in playback every frame is played twice */
+ int field_per_buff; /* Number of fields per buffer: 1 or 2 */
+ int img_x; /* start of image in x direction */
+ int img_y; /* start of image in y direction */
+ int img_width; /* image width BEFORE decimation,
+ must be a multiple of HorDcm*16 */
+ int img_height; /* image height BEFORE decimation,
+ must be a multiple of VerDcm*8 */
+
+ /* --- End of parameters for decimation==0 only --- */
+
+ /* JPEG control parameters */
+
+ int quality; /* Measure for quality of compressed images.
+ Scales linearly with the size of the compressed images.
+ Must be beetween 0 and 100, 100 is a compression
+ ratio of 1:4 */
+
+ int odd_even; /* Which field should come first ???
+ This is more aptly named "top_first",
+ i.e. (odd_even==1) --> top-field-first */
+
+ int APPn; /* Number of APP segment to be written, must be 0..15 */
+ int APP_len; /* Length of data in JPEG APPn segment */
+ char APP_data[60]; /* Data in the JPEG APPn segment. */
+
+ int COM_len; /* Length of data in JPEG COM segment */
+ char COM_data[60]; /* Data in JPEG COM segment */
+
+ unsigned long jpeg_markers; /* Which markers should go into the JPEG output.
+ Unless you exactly know what you do, leave them untouched.
+ Inluding less markers will make the resulting code
+ smaller, but there will be fewer applications
+ which can read it.
+ The presence of the APP and COM marker is
+ influenced by APP0_len and COM_len ONLY! */
+#define JPEG_MARKER_DHT (1<<3) /* Define Huffman Tables */
+#define JPEG_MARKER_DQT (1<<4) /* Define Quantization Tables */
+#define JPEG_MARKER_DRI (1<<5) /* Define Restart Interval */
+#define JPEG_MARKER_COM (1<<6) /* Comment segment */
+#define JPEG_MARKER_APP (1<<7) /* App segment, driver will allways use APP0 */
+
+ int VFIFO_FB; /* Flag for enabling Video Fifo Feedback.
+ If this flag is turned on and JPEG decompressing
+ is going to the screen, the decompress process
+ is stopped every time the Video Fifo is full.
+ This enables a smooth decompress to the screen
+ but the video output signal will get scrambled */
+
+ /* Misc */
+
+ char reserved[312]; /* Makes 512 bytes for this structure */
+};
+
+struct mjpeg_requestbuffers
+{
+ unsigned long count; /* Number of buffers for MJPEG grabbing */
+ unsigned long size; /* Size PER BUFFER in bytes */
+};
+
+struct mjpeg_sync
+{
+ unsigned long frame; /* Frame (0 - n) for double buffer */
+ unsigned long length; /* number of code bytes in buffer (capture only) */
+ unsigned long seq; /* frame sequence number */
+ struct timeval timestamp; /* timestamp */
+};
+
+struct mjpeg_status
+{
+ int input; /* Input channel, has to be set prior to BUZIOC_G_STATUS */
+ int signal; /* Returned: 1 if valid video signal detected */
+ int norm; /* Returned: VIDEO_MODE_PAL or VIDEO_MODE_NTSC */
+ int color; /* Returned: 1 if color signal detected */
+};
+
+/*
+Private IOCTL to set up for displaying MJPEG
+*/
+#define MJPIOC_G_PARAMS _IOR ('v', BASE_VIDIOCPRIVATE+0, struct mjpeg_params)
+#define MJPIOC_S_PARAMS _IOWR('v', BASE_VIDIOCPRIVATE+1, struct mjpeg_params)
+#define MJPIOC_REQBUFS _IOWR('v', BASE_VIDIOCPRIVATE+2, struct mjpeg_requestbuffers)
+#define MJPIOC_QBUF_CAPT _IOW ('v', BASE_VIDIOCPRIVATE+3, int)
+#define MJPIOC_QBUF_PLAY _IOW ('v', BASE_VIDIOCPRIVATE+4, int)
+#define MJPIOC_SYNC _IOR ('v', BASE_VIDIOCPRIVATE+5, struct mjpeg_sync)
+#define MJPIOC_G_STATUS _IOWR('v', BASE_VIDIOCPRIVATE+6, struct mjpeg_status)
+
+#endif /* __VIDEODEV_MJPEG_H__ */