73 строки
2.6 KiB
C
73 строки
2.6 KiB
C
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/*
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Public ivtv API header
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Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
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Copyright (C) 2004-2007 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __LINUX_IVTV_H__
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#define __LINUX_IVTV_H__
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#ifdef __KERNEL__
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#include <linux/compiler.h> /* need __user */
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#else
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#define __user
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#endif
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#include <linux/types.h>
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/* ivtv knows several distinct output modes: MPEG streaming,
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YUV streaming, YUV updates through user DMA and the passthrough
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mode.
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In order to clearly tell the driver that we are in user DMA
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YUV mode you need to call IVTV_IOC_DMA_FRAME with y_source == NULL
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first (althrough if you don't then the first time
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DMA_FRAME is called the mode switch is done automatically).
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When you close the file handle the user DMA mode is exited again.
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While in one mode, you cannot use another mode (EBUSY is returned).
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All this means that if you want to change the YUV interlacing
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for the user DMA YUV mode you first need to do call IVTV_IOC_DMA_FRAME
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with y_source == NULL before you can set the correct format using
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VIDIOC_S_FMT.
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Eventually all this should be replaced with a proper V4L2 API,
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but for now we have to do it this way. */
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struct ivtv_dma_frame {
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enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_OUTPUT */
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__u32 pixelformat; /* 0 == same as destination */
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void __user *y_source; /* if NULL and type == V4L2_BUF_TYPE_VIDEO_OUTPUT,
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then just switch to user DMA YUV output mode */
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void __user *uv_source; /* Unused for RGB pixelformats */
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struct v4l2_rect src;
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struct v4l2_rect dst;
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__u32 src_width;
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__u32 src_height;
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};
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#define IVTV_IOC_DMA_FRAME _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)
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/* These are the VBI types as they appear in the embedded VBI private packets. */
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#define IVTV_SLICED_TYPE_TELETEXT_B (1)
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#define IVTV_SLICED_TYPE_CAPTION_525 (4)
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#define IVTV_SLICED_TYPE_WSS_625 (5)
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#define IVTV_SLICED_TYPE_VPS (7)
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#endif /* _LINUX_IVTV_H */
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