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https://github.com/mpv-player/mpv
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21017aa526
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4670 b3059339-0415-0410-9bf9-f77b7e298cf2
119 lines
5.8 KiB
C
119 lines
5.8 KiB
C
/* These are the MJPEG API extensions for the Video4Linux API,
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first introduced by the Iomega Buz driver by Rainer Johanni
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<rainer@johanni.de>
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*/
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/* This is identical with the mgavideo internal params struct,
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please tell me if you change this struct here ! <gz@lysator.liu.se) */
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struct mjpeg_params
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{
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/* The following parameters can only be queried */
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int major_version; /* Major version number of driver */
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int minor_version; /* Minor version number of driver */
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/* Main control parameters */
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int input; /* Input channel: 0 = Composite, 1 = S-VHS */
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int norm; /* Norm: VIDEO_MODE_PAL or VIDEO_MODE_NTSC */
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int decimation; /* decimation of captured video,
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enlargement of video played back.
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Valid values are 1, 2, 4 or 0.
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0 is a special value where the user
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has full control over video scaling */
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/* The following parameters only have to be set if decimation==0,
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for other values of decimation they provide the data how the image is captured */
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int HorDcm; /* Horizontal decimation: 1, 2 or 4 */
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int VerDcm; /* Vertical decimation: 1 or 2 */
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int TmpDcm; /* Temporal decimation: 1 or 2,
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if TmpDcm==2 in capture every second frame is dropped,
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in playback every frame is played twice */
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int field_per_buff; /* Number of fields per buffer: 1 or 2 */
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int img_x; /* start of image in x direction */
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int img_y; /* start of image in y direction */
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int img_width; /* image width BEFORE decimation,
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must be a multiple of HorDcm*16 */
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int img_height; /* image height BEFORE decimation,
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must be a multiple of VerDcm*8 */
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/* --- End of parameters for decimation==0 only --- */
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/* JPEG control parameters */
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int quality; /* Measure for quality of compressed images.
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Scales linearly with the size of the compressed images.
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Must be beetween 0 and 100, 100 is a compression
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ratio of 1:4 */
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int odd_even; /* Which field should come first ???
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This is more aptly named "top_first",
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i.e. (odd_even==1) --> top-field-first */
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int APPn; /* Number of APP segment to be written, must be 0..15 */
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int APP_len; /* Length of data in JPEG APPn segment */
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char APP_data[60]; /* Data in the JPEG APPn segment. */
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int COM_len; /* Length of data in JPEG COM segment */
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char COM_data[60]; /* Data in JPEG COM segment */
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unsigned long jpeg_markers; /* Which markers should go into the JPEG output.
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Unless you exactly know what you do, leave them untouched.
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Inluding less markers will make the resulting code
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smaller, but there will be fewer aplications
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which can read it.
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The presence of the APP and COM marker is
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influenced by APP0_len and COM_len ONLY! */
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#define JPEG_MARKER_DHT (1<<3) /* Define Huffman Tables */
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#define JPEG_MARKER_DQT (1<<4) /* Define Quantization Tables */
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#define JPEG_MARKER_DRI (1<<5) /* Define Restart Interval */
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#define JPEG_MARKER_COM (1<<6) /* Comment segment */
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#define JPEG_MARKER_APP (1<<7) /* App segment, driver will allways use APP0 */
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int VFIFO_FB; /* Flag for enabling Video Fifo Feedback.
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If this flag is turned on and JPEG decompressing
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is going to the screen, the decompress process
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is stopped every time the Video Fifo is full.
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This enables a smooth decompress to the screen
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but the video output signal will get scrambled */
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/* Misc */
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char reserved[312]; /* Makes 512 bytes for this structure */
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};
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struct mjpeg_requestbuffers
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{
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unsigned long count; /* Number of buffers for MJPEG grabbing */
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unsigned long size; /* Size PER BUFFER in bytes */
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};
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struct mjpeg_sync
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{
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unsigned long frame; /* Frame (0 - n) for double buffer */
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unsigned long length; /* number of code bytes in buffer (capture only) */
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unsigned long seq; /* frame sequence number */
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struct timeval timestamp; /* timestamp */
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};
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struct mjpeg_status
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{
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int input; /* Input channel, has to be set prior to BUZIOC_G_STATUS */
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int signal; /* Returned: 1 if valid video signal detected */
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int norm; /* Returned: VIDEO_MODE_PAL or VIDEO_MODE_NTSC */
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int color; /* Returned: 1 if color signal detected */
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};
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/*
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Private IOCTL to set up for displaying MJPEG
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*/
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#define MJPIOC_G_PARAMS _IOR ('v', BASE_VIDIOCPRIVATE+0, struct mjpeg_params)
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#define MJPIOC_S_PARAMS _IOWR('v', BASE_VIDIOCPRIVATE+1, struct mjpeg_params)
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#define MJPIOC_REQBUFS _IOWR('v', BASE_VIDIOCPRIVATE+2, struct mjpeg_requestbuffers)
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#define MJPIOC_QBUF_CAPT _IOW ('v', BASE_VIDIOCPRIVATE+3, int)
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#define MJPIOC_QBUF_PLAY _IOW ('v', BASE_VIDIOCPRIVATE+4, int)
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#define MJPIOC_SYNC _IOR ('v', BASE_VIDIOCPRIVATE+5, struct mjpeg_sync)
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#define MJPIOC_G_STATUS _IOWR('v', BASE_VIDIOCPRIVATE+6, struct mjpeg_status)
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