linux-headers (unknown)
1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 Public ivtv API header
4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
5 Copyright (C) 2004-2007 Hans Verkuil <hverkuil@xs4all.nl>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #ifndef __LINUX_IVTV_H__
23 #define __LINUX_IVTV_H__
24
25
26 #include <linux/types.h>
27 #include <linux/videodev2.h>
28
29 /* ivtv knows several distinct output modes: MPEG streaming,
30 YUV streaming, YUV updates through user DMA and the passthrough
31 mode.
32
33 In order to clearly tell the driver that we are in user DMA
34 YUV mode you need to call IVTV_IOC_DMA_FRAME with y_source == NULL
35 first (althrough if you don't then the first time
36 DMA_FRAME is called the mode switch is done automatically).
37
38 When you close the file handle the user DMA mode is exited again.
39
40 While in one mode, you cannot use another mode (EBUSY is returned).
41
42 All this means that if you want to change the YUV interlacing
43 for the user DMA YUV mode you first need to do call IVTV_IOC_DMA_FRAME
44 with y_source == NULL before you can set the correct format using
45 VIDIOC_S_FMT.
46
47 Eventually all this should be replaced with a proper V4L2 API,
48 but for now we have to do it this way. */
49
50 struct ivtv_dma_frame {
51 enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_OUTPUT */
52 __u32 pixelformat; /* 0 == same as destination */
53 void *y_source; /* if NULL and type == V4L2_BUF_TYPE_VIDEO_OUTPUT,
54 then just switch to user DMA YUV output mode */
55 void *uv_source; /* Unused for RGB pixelformats */
56 struct v4l2_rect src;
57 struct v4l2_rect dst;
58 __u32 src_width;
59 __u32 src_height;
60 };
61
62 #define IVTV_IOC_DMA_FRAME _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)
63
64 /* Select the passthrough mode (if the argument is non-zero). In the passthrough
65 mode the output of the encoder is passed immediately into the decoder. */
66 #define IVTV_IOC_PASSTHROUGH_MODE _IOW ('V', BASE_VIDIOC_PRIVATE+1, int)
67
68 /* Deprecated defines: applications should use the defines from videodev2.h */
69 #define IVTV_SLICED_TYPE_TELETEXT_B V4L2_MPEG_VBI_IVTV_TELETEXT_B
70 #define IVTV_SLICED_TYPE_CAPTION_525 V4L2_MPEG_VBI_IVTV_CAPTION_525
71 #define IVTV_SLICED_TYPE_WSS_625 V4L2_MPEG_VBI_IVTV_WSS_625
72 #define IVTV_SLICED_TYPE_VPS V4L2_MPEG_VBI_IVTV_VPS
73
74 #endif /* _LINUX_IVTV_H */
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