| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 | #include <linux/compiler.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/videodev2.h> |
| 27 | |
| 28 | /* ivtv knows several distinct output modes: MPEG streaming, |
| 29 | YUV streaming, YUV updates through user DMA and the passthrough |
| 30 | mode. |
| 31 | |
| 32 | In order to clearly tell the driver that we are in user DMA |
| 33 | YUV mode you need to call IVTV_IOC_DMA_FRAME with y_source == NULL |
| 34 | first (althrough if you don't then the first time |
| 35 | DMA_FRAME is called the mode switch is done automatically). |
| 36 | |
| 37 | When you close the file handle the user DMA mode is exited again. |
| 38 | |
| 39 | While in one mode, you cannot use another mode (EBUSY is returned). |
| 40 | |
| 41 | All this means that if you want to change the YUV interlacing |
| 42 | for the user DMA YUV mode you first need to do call IVTV_IOC_DMA_FRAME |
| 43 | with y_source == NULL before you can set the correct format using |
| 44 | VIDIOC_S_FMT. |
| 45 | |
| 46 | Eventually all this should be replaced with a proper V4L2 API, |
| 47 | but for now we have to do it this way. */ |
| 48 | |
| 49 | struct ivtv_dma_frame { |
| 50 | enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_OUTPUT */ |
| 51 | __u32 pixelformat; /* 0 == same as destination */ |
| 52 | void __user *y_source; /* if NULL and type == V4L2_BUF_TYPE_VIDEO_OUTPUT, |
| 53 | then just switch to user DMA YUV output mode */ |
| 54 | void __user *uv_source; /* Unused for RGB pixelformats */ |
| 55 | struct v4l2_rect src; |
| 56 | struct v4l2_rect dst; |
| 57 | __u32 src_width; |
| 58 | __u32 src_height; |
| 59 | }; |
| 60 | |
| 61 | #define IVTV_IOC_DMA_FRAME _IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame) |
| 62 | |
| 63 | /* Select the passthrough mode (if the argument is non-zero). In the passthrough |
| 64 | mode the output of the encoder is passed immediately into the decoder. */ |
| 65 | #define IVTV_IOC_PASSTHROUGH_MODE _IOW ('V', BASE_VIDIOC_PRIVATE+1, int) |
| 66 | |
| 67 | /* Deprecated defines: applications should use the defines from videodev2.h */ |
| 68 | #define IVTV_SLICED_TYPE_TELETEXT_B V4L2_MPEG_VBI_IVTV_TELETEXT_B |
| 69 | #define IVTV_SLICED_TYPE_CAPTION_525 V4L2_MPEG_VBI_IVTV_CAPTION_525 |
| 70 | #define IVTV_SLICED_TYPE_WSS_625 V4L2_MPEG_VBI_IVTV_WSS_625 |
| 71 | #define IVTV_SLICED_TYPE_VPS V4L2_MPEG_VBI_IVTV_VPS |
| 72 | |
| 73 | #endif /* _LINUX_IVTV_H */ |