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1.. SPDX-License-Identifier: GPL-2.02 3The ivtv driver4===============5 6Author: Hans Verkuil <hverkuil@xs4all.nl>7 8This is a v4l2 device driver for the Conexant cx23415/6 MPEG encoder/decoder.9The cx23415 can do both encoding and decoding, the cx23416 can only do MPEG10encoding. Currently the only card featuring full decoding support is the11Hauppauge PVR-350.12 13.. note::14 15 #) This driver requires the latest encoder firmware (version 2.06.039, size16 376836 bytes). Get the firmware from here:17 18 https://linuxtv.org/downloads/firmware/#conexant19 20 #) 'normal' TV applications do not work with this driver, you need21 an application that can handle MPEG input such as mplayer, xine, MythTV,22 etc.23 24The primary goal of the IVTV project is to provide a "clean room" Linux25Open Source driver implementation for video capture cards based on the26iCompression iTVC15 or Conexant CX23415/CX23416 MPEG Codec.27 28Features29--------30 31 * Hardware mpeg2 capture of broadcast video (and sound) via the tuner or32 S-Video/Composite and audio line-in.33 * Hardware mpeg2 capture of FM radio where hardware support exists34 * Supports NTSC, PAL, SECAM with stereo sound35 * Supports SAP and bilingual transmissions.36 * Supports raw VBI (closed captions and teletext).37 * Supports sliced VBI (closed captions and teletext) and is able to insert38 this into the captured MPEG stream.39 * Supports raw YUV and PCM input.40 41Additional features for the PVR-350 (CX23415 based)42---------------------------------------------------43 44 * Provides hardware mpeg2 playback45 * Provides comprehensive OSD (On Screen Display: ie. graphics overlaying the46 video signal)47 * Provides a framebuffer (allowing X applications to appear on the video48 device)49 * Supports raw YUV output.50 51IMPORTANT: In case of problems first read this page:52 https://help.ubuntu.com/community/Install_IVTV_Troubleshooting53 54See also55--------56 57https://linuxtv.org58 59IRC60---61 62irc://irc.freenode.net/#v4l63 64----------------------------------------------------------65 66Devices67-------68 69A maximum of 12 ivtv boards are allowed at the moment.70 71Cards that don't have a video output capability (i.e. non PVR350 cards)72lack the vbi8, vbi16, video16 and video48 devices. They also do not73support the framebuffer device /dev/fbx for OSD.74 75The radio0 device may or may not be present, depending on whether the76card has a radio tuner or not.77 78Here is a list of the base v4l devices:79 80.. code-block:: none81 82 crw-rw---- 1 root video 81, 0 Jun 19 22:22 /dev/video083 crw-rw---- 1 root video 81, 16 Jun 19 22:22 /dev/video1684 crw-rw---- 1 root video 81, 24 Jun 19 22:22 /dev/video2485 crw-rw---- 1 root video 81, 32 Jun 19 22:22 /dev/video3286 crw-rw---- 1 root video 81, 48 Jun 19 22:22 /dev/video4887 crw-rw---- 1 root video 81, 64 Jun 19 22:22 /dev/radio088 crw-rw---- 1 root video 81, 224 Jun 19 22:22 /dev/vbi089 crw-rw---- 1 root video 81, 228 Jun 19 22:22 /dev/vbi890 crw-rw---- 1 root video 81, 232 Jun 19 22:22 /dev/vbi1691 92Base devices93------------94 95For every extra card you have the numbers increased by one. For example,96/dev/video0 is listed as the 'base' encoding capture device so we have:97 98- /dev/video0 is the encoding capture device for the first card (card 0)99- /dev/video1 is the encoding capture device for the second card (card 1)100- /dev/video2 is the encoding capture device for the third card (card 2)101 102Note that if the first card doesn't have a feature (eg no decoder, so no103video16, the second card will still use video17. The simple rule is 'add104the card number to the base device number'. If you have other capture105cards (e.g. WinTV PCI) that are detected first, then you have to tell106the ivtv module about it so that it will start counting at 1 (or 2, or107whatever). Otherwise the device numbers can get confusing. The ivtv108'ivtv_first_minor' module option can be used for that.109 110 111- /dev/video0112 113 The encoding capture device(s).114 115 Read-only.116 117 Reading from this device gets you the MPEG1/2 program stream.118 Example:119 120 .. code-block:: none121 122 cat /dev/video0 > my.mpg (you need to hit ctrl-c to exit)123 124 125- /dev/video16126 127 The decoder output device(s)128 129 Write-only. Only present if the MPEG decoder (i.e. CX23415) exists.130 131 An mpeg2 stream sent to this device will appear on the selected video132 display, audio will appear on the line-out/audio out. It is only133 available for cards that support video out. Example:134 135 .. code-block:: none136 137 cat my.mpg >/dev/video16138 139 140- /dev/video24141 142 The raw audio capture device(s).143 144 Read-only145 146 The raw audio PCM stereo stream from the currently selected147 tuner or audio line-in. Reading from this device results in a raw148 (signed 16 bit Little Endian, 48000 Hz, stereo pcm) capture.149 This device only captures audio. This should be replaced by an ALSA150 device in the future.151 Note that there is no corresponding raw audio output device, this is152 not supported in the decoder firmware.153 154 155- /dev/video32156 157 The raw video capture device(s)158 159 Read-only160 161 The raw YUV video output from the current video input. The YUV format162 is a 16x16 linear tiled NV12 format (V4L2_PIX_FMT_NV12_16L16)163 164 Note that the YUV and PCM streams are not synchronized, so they are of165 limited use.166 167 168- /dev/video48169 170 The raw video display device(s)171 172 Write-only. Only present if the MPEG decoder (i.e. CX23415) exists.173 174 Writes a YUV stream to the decoder of the card.175 176 177- /dev/radio0178 179 The radio tuner device(s)180 181 Cannot be read or written.182 183 Used to enable the radio tuner and tune to a frequency. You cannot184 read or write audio streams with this device. Once you use this185 device to tune the radio, use /dev/video24 to read the raw pcm stream186 or /dev/video0 to get an mpeg2 stream with black video.187 188 189- /dev/vbi0190 191 The 'vertical blank interval' (Teletext, CC, WSS etc) capture device(s)192 193 Read-only194 195 Captures the raw (or sliced) video data sent during the Vertical Blank196 Interval. This data is used to encode teletext, closed captions, VPS,197 widescreen signalling, electronic program guide information, and other198 services.199 200 201- /dev/vbi8202 203 Processed vbi feedback device(s)204 205 Read-only. Only present if the MPEG decoder (i.e. CX23415) exists.206 207 The sliced VBI data embedded in an MPEG stream is reproduced on this208 device. So while playing back a recording on /dev/video16, you can209 read the embedded VBI data from /dev/vbi8.210 211 212- /dev/vbi16213 214 The vbi 'display' device(s)215 216 Write-only. Only present if the MPEG decoder (i.e. CX23415) exists.217 218 Can be used to send sliced VBI data to the video-out connector.219