include/linux/ivtv.h

   1 /*
   2     Public ivtv API header
   3     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   4     Copyright (C) 2004-2007  Hans Verkuil <hverkuil@xs4all.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef __LINUX_IVTV_H__
  22 #define __LINUX_IVTV_H__
  23
  24 #ifdef __KERNEL__
  25 #include <linux/compiler.h> /* need __user */
  26 #else
  27 #define __user
  28 #endif
  29 #include <linux/types.h>
  30
  31 /* ivtv knows several distinct output modes: MPEG streaming,
  32    YUV streaming, YUV updates through user DMA and the passthrough
  33    mode.
  34
  35    In order to clearly tell the driver that we are in user DMA
  36    YUV mode you need to call IVTV_IOC_DMA_FRAME with y_source == NULL
  37    first (althrough if you don't then the first time
  38    DMA_FRAME is called the mode switch is done automatically).
  39
  40    When you close the file handle the user DMA mode is exited again.
  41
  42    While in one mode, you cannot use another mode (EBUSY is returned).
  43
  44    All this means that if you want to change the YUV interlacing
  45    for the user DMA YUV mode you first need to do call IVTV_IOC_DMA_FRAME
  46    with y_source == NULL before you can set the correct format using
  47    VIDIOC_S_FMT.
  48
  49    Eventually all this should be replaced with a proper V4L2 API,
  50    but for now we have to do it this way. */
  51
  52 struct ivtv_dma_frame {
  53         enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_OUTPUT */
  54         __u32 pixelformat;       /* 0 == same as destination */
  55         void __user *y_source;   /* if NULL and type == V4L2_BUF_TYPE_VIDEO_OUTPUT,
  56                                     then just switch to user DMA YUV output mode */
  57         void __user *uv_source;  /* Unused for RGB pixelformats */
  58         struct v4l2_rect src;
  59         struct v4l2_rect dst;
  60         __u32 src_width;
  61         __u32 src_height;
  62 };
  63
  64 #define IVTV_IOC_DMA_FRAME  _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)
  65
  66 /* These are the VBI types as they appear in the embedded VBI private packets. */
  67 #define IVTV_SLICED_TYPE_TELETEXT_B     (1)
  68 #define IVTV_SLICED_TYPE_CAPTION_525    (4)
  69 #define IVTV_SLICED_TYPE_WSS_625        (5)
  70 #define IVTV_SLICED_TYPE_VPS            (7)
  71
  72 #endif /* _LINUX_IVTV_H */