| 1 | /* ======================================================================== *\
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| 2 | !
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| 3 | ! *
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| 4 | ! * This file is part of MARS, the MAGIC Analysis and Reconstruction
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| 5 | ! * Software. It is distributed to you in the hope that it can be a useful
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| 6 | ! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
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| 7 | ! * It is distributed WITHOUT ANY WARRANTY.
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| 8 | ! *
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| 9 | ! * Permission to use, copy, modify and distribute this software and its
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| 10 | ! * documentation for any purpose is hereby granted without fee,
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| 11 | ! * provided that the above copyright notice appear in all copies and
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| 12 | ! * that both that copyright notice and this permission notice appear
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| 13 | ! * in supporting documentation. It is provided "as is" without express
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| 14 | ! * or implied warranty.
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| 15 | ! *
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| 16 | !
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| 17 | !
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| 18 | ! Author(s): Thomas Bretz 1/2008 <mailto:tbretz@astro.uni-wuerzburg.de>
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| 19 | !
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| 20 | ! Copyright: MAGIC Software Development, 2000-2008
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| 21 | !
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| 22 | !
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| 23 | \* ======================================================================== */
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| 24 |
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| 25 | /////////////////////////////////////////////////////////////////////////////
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| 26 | //
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| 27 | // MVideo
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| 28 | //
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| 29 | // Interface to Video4Linux at a simple level
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| 30 | //
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| 31 | /////////////////////////////////////////////////////////////////////////////
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| 32 | #include "MVideo.h"
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| 33 |
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| 34 | // iostream
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| 35 | #include <iostream>
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| 36 |
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| 37 | // open
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| 38 | #include <sys/types.h>
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| 39 | #include <sys/stat.h>
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| 40 | #include <fcntl.h>
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| 41 |
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| 42 | #include <unistd.h> // usleep
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| 43 | #include <errno.h> // errno
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| 44 | #include <sys/mman.h> // mmap
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| 45 | #include <sys/ioctl.h> // ioctl
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| 46 |
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| 47 | #include <TString.h>
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| 48 |
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| 49 | #include "MLog.h"
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| 50 | #include "MLogManip.h"
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| 51 |
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| 52 | using namespace std;
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| 53 |
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| 54 | //ClassImp(MVideo);
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| 55 |
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| 56 | // -------------------------------------------------------------
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| 57 | //
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| 58 | // Constructor. Specify the device (e.g. "/dev/video") to be used
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| 59 | //
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| 60 | MVideo::MVideo(const char *path) : fPath(path), fFileDesc(-1), fMapBuffer(0)
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| 61 | {
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| 62 | Reset();
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| 63 | }
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| 64 |
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| 65 | // -------------------------------------------------------------
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| 66 | //
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| 67 | // Internal function to reset the descriptors of the device
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| 68 | //
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| 69 | void MVideo::Reset()
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| 70 | {
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| 71 | memset(&fCaps, 0, sizeof(fCaps));
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| 72 | memset(&fChannel, 0, sizeof(fChannel));
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| 73 | memset(&fBuffer, 0, sizeof(fBuffer));
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| 74 |
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| 75 | fFileDesc = -1;
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| 76 | fMapBuffer = 0;
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| 77 | fChannel.channel = -1;
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| 78 | }
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| 79 |
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| 80 | // -------------------------------------------------------------
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| 81 | //
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| 82 | // Mapper around ioctl for easier access to the device
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| 83 | //
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| 84 | int MVideo::Ioctl(int req, void *opt, bool allowirq) const
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| 85 | {
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| 86 | if (fFileDesc<0)
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| 87 | {
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| 88 | gLog << err << "ERROR - Ioctl: Device " << fPath << " not open." << endl;
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| 89 | return -1;
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| 90 | }
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| 91 |
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| 92 | while (1)
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| 93 | {
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| 94 | // FIXME: This call is a possible source for a hangup
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| 95 | const int rc = ioctl(fFileDesc, req, opt);
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| 96 | if (rc>=0)
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| 97 | return rc;
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| 98 |
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| 99 | // errno== 4: Interrupted system call (e.g. by alarm())
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| 100 | // errno==16: Device or resource busy
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| 101 | if (errno==4 || errno==16)
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| 102 | {
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| 103 | if (!allowirq && errno==4)
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| 104 | return -4;
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| 105 |
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| 106 | gLog << err << "ERROR - MVideo::Ioctl 0x" << hex << req << ": errno=" << dec << errno << " - ";
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| 107 | gLog << strerror(errno) << " (rc=" << rc << ")" << endl;
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| 108 | usleep(10);
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| 109 | continue;
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| 110 | }
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| 111 |
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| 112 | gLog << err << "ERROR - MVideo::Ioctl 0x" << hex << req << ": errno=" << dec << errno << " - ";
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| 113 | gLog << strerror(errno) << " (rc=" << rc << ")" << endl;
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| 114 | return rc;
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| 115 | }
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| 116 | return -1;
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| 117 | }
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| 118 |
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| 119 | // -------------------------------------------------------------
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| 120 | //
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| 121 | // Read the capabilities of the device
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| 122 | //
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| 123 | Bool_t MVideo::GetCapabilities()
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| 124 | {
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| 125 | return Ioctl(VIDIOCGCAP, &fCaps)!=-1;
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| 126 | }
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| 127 |
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| 128 | // -------------------------------------------------------------
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| 129 | //
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| 130 | // Read the properties of the device
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| 131 | //
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| 132 | Bool_t MVideo::GetProperties()
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| 133 | {
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| 134 | return Ioctl(VIDIOCGPICT, &fProp)!=-1;
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| 135 | }
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| 136 |
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| 137 | // -------------------------------------------------------------
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| 138 | //
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| 139 | // Open channel ch of the device
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| 140 | //
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| 141 | Bool_t MVideo::Open(Int_t ch)
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| 142 | {
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| 143 | Bool_t rc = Init(ch);
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| 144 | if (!rc)
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| 145 | Close();
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| 146 | return rc;
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| 147 | }
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| 148 |
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| 149 | // -------------------------------------------------------------
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| 150 | //
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| 151 | // Open a channel of the device and retriev all necessary
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| 152 | // informations from the driver. Initialize the shared
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| 153 | // memory. Other access methods are not supported yet.
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| 154 | //
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| 155 | Bool_t MVideo::Init(Int_t channel)
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| 156 | {
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| 157 | if (IsOpen())
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| 158 | {
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| 159 | gLog << warn << "WARNING - Device " << fPath << " already open." << endl;
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| 160 | return kTRUE;
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| 161 | }
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| 162 |
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| 163 | gLog << all << "Opening " << fPath << "... " << flush;
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| 164 | do
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| 165 | {
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| 166 | fFileDesc = open(fPath, O_RDWR);
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| 167 | usleep(1);
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| 168 | }
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| 169 | while (errno==19 && fFileDesc==-1);
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| 170 |
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| 171 | if (fFileDesc == -1)
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| 172 | {
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| 173 | gLog << err << "ERROR: " << strerror(errno) << endl;
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| 174 | return kFALSE;
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| 175 | }
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| 176 |
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| 177 | gLog << "done (" << fFileDesc << ")." << endl;
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| 178 |
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| 179 | // Close device on exit
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| 180 | if (fcntl(fFileDesc, F_SETFD, FD_CLOEXEC)<0)
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| 181 | {
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| 182 | gLog << err << "ERROR - Call to fnctl (F_SETFD, FD_CLOEXEC) failed." << endl;
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| 183 | return kFALSE;
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| 184 | }
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| 185 |
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| 186 | if (!GetCapabilities())
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| 187 | {
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| 188 | gLog << err << "ERROR - Getting device capabilities failed." << endl;
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| 189 | return kFALSE;
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| 190 | }
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| 191 |
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| 192 | if (!SetChannel(channel))
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| 193 | return kFALSE;
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| 194 |
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| 195 | if (!GetProperties())
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| 196 | {
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| 197 | gLog << err << "ERROR - Couldn't get picture properties." << endl;
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| 198 | return kFALSE;
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| 199 | }
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| 200 |
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| 201 | // get mmap grab buffer info
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| 202 | if (Ioctl(VIDIOCGMBUF, &fBuffer)==-1)
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| 203 | {
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| 204 | gLog << err << "ERROR - Couldn't get info about memory map buffer." << endl;
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| 205 | return kFALSE;
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| 206 | }
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| 207 |
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| 208 | // map file (device) into memory
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| 209 | fMapBuffer = (char*)mmap(0, fBuffer.size, PROT_READ|PROT_WRITE, MAP_SHARED, fFileDesc, 0);
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| 210 | if (fMapBuffer == (void*)-1)
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| 211 | {
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| 212 | gLog << err << "ERROR - Couldn't map device buffer into memory." << endl;
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| 213 | fMapBuffer = 0;
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| 214 | return kFALSE;
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| 215 | }
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| 216 |
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| 217 | Print();
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| 218 |
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| 219 | return kTRUE;
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| 220 | }
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| 221 |
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| 222 | // -------------------------------------------------------------
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| 223 | //
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| 224 | // Close device. Free the shared memory
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| 225 | //
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| 226 | Int_t MVideo::Close()
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| 227 | {
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| 228 | // if (!IsOpen())
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| 229 | // return kTRUE;
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| 230 |
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| 231 | Bool_t rc = kTRUE;
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| 232 |
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| 233 | gLog << all << "Closing " << fPath << " (" << fFileDesc << ")... " << flush;
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| 234 | if (fFileDesc != -1)
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| 235 | {
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| 236 | if (close(fFileDesc)<0)
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| 237 | {
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| 238 | gLog << err << "ERROR!" << endl;
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| 239 | rc = kFALSE;
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| 240 | }
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| 241 | fFileDesc = -1;
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| 242 | }
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| 243 | gLog << "done." << endl;
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| 244 |
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| 245 | // unmap device memory
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| 246 | if (fMapBuffer)
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| 247 | munmap(fMapBuffer, fBuffer.size);
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| 248 |
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| 249 | Reset();
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| 250 |
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| 251 | return rc;
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| 252 | }
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| 253 |
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| 254 | // -------------------------------------------------------------
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| 255 | //
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| 256 | // Instruct hardware to start capture into framebuffer frame
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| 257 | //
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| 258 | Bool_t MVideo::CaptureStart(unsigned int frame) const
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| 259 | {
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| 260 | struct video_mmap gb =
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| 261 | {
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| 262 | frame%fBuffer.frames, // frame
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| 263 | fCaps.maxheight, fCaps.maxwidth, // height, width
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| 264 | VIDEO_PALETTE_RGB24 // palette
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| 265 | };
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| 266 |
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| 267 | //
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| 268 | // capture frame
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| 269 | //
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| 270 | if (Ioctl(VIDIOCMCAPTURE, &gb) != -1)
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| 271 | return kTRUE;
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| 272 |
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| 273 | // if (errno == EAGAIN)
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| 274 | gLog << err;
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| 275 | gLog << "ERROR - Couldn't start capturing frame " << frame << " - unable to sync." << endl;
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| 276 | gLog << " Maybe your card doesn't support VIDEO_PALETTE_RGB24." << endl;
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| 277 |
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| 278 | return kFALSE;
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| 279 | }
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| 280 |
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| 281 | // -------------------------------------------------------------
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| 282 | //
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| 283 | // Wait until hardware has finished capture into framebuffer frame
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| 284 | //
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| 285 | Int_t MVideo::CaptureWait(unsigned int frame, char **ptr) const
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| 286 | {
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| 287 | frame %= fBuffer.frames;
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| 288 |
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| 289 | *ptr = NULL;
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| 290 |
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| 291 | const int SYNC_TIMEOUT = 1;
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| 292 |
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| 293 | alarm(SYNC_TIMEOUT);
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| 294 | const Int_t rc = Ioctl(VIDIOCSYNC, &frame, false);
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| 295 | if (rc==-4)
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| 296 | {
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| 297 | //cout << "ERROR - Waiting for frame " << frame << " timed out." << endl;
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| 298 | return kSKIP;
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| 299 | }
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| 300 | alarm(0);
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| 301 |
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| 302 | if (rc==-1)
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| 303 | {
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| 304 | gLog << err << "ERROR - Waiting for captured frame failed." << endl;
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| 305 | return kFALSE;
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| 306 | }
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| 307 |
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| 308 | *ptr = fMapBuffer+fBuffer.offsets[frame];
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| 309 |
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| 310 | return kTRUE;
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| 311 | }
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| 312 |
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| 313 | // -------------------------------------------------------------
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| 314 | //
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| 315 | // Change the channel of a priviously opened device
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| 316 | //
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| 317 | Bool_t MVideo::SetChannel(Int_t chan)
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| 318 | {
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| 319 | if (fChannel.channel==chan)
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| 320 | return kTRUE;
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| 321 |
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| 322 | if (chan<0 || chan>=fCaps.channels)
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| 323 | {
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| 324 | gLog << err << "ERROR - Set channel " << chan << " out of range." << endl;
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| 325 | return kFALSE;
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| 326 | }
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| 327 |
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| 328 | // Switch to channel
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| 329 | struct video_channel ch = { chan, "", 0, 0, 0, 0 };
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| 330 | if (Ioctl(VIDIOCSCHAN, &ch)==-1)
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| 331 | {
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| 332 | gLog << err << "ERROR - Couldn't switch to channel " << chan << "." << endl;
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| 333 | gLog << " You might need a bttv version > 0.5.13" << endl;
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| 334 | return kFALSE;
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| 335 | }
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| 336 |
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| 337 | // Get information about channel
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| 338 | if (Ioctl(VIDIOCGCHAN, &ch)==-1)
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| 339 | {
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| 340 | gLog << err << "ERROR - Getting information for channel " << chan << " failed." << endl;
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| 341 | return kFALSE;
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| 342 | }
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| 343 |
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| 344 | memcpy(&fChannel, &ch, sizeof(fChannel));
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| 345 |
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| 346 | gLog << all << "Switched to channel " << chan << endl;
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| 347 |
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| 348 | return kTRUE;
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| 349 | }
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| 350 |
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| 351 | // -------------------------------------------------------------
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| 352 | //
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| 353 | // Has the device capture capabilities?
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| 354 | //
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| 355 | Bool_t MVideo::CanCapture() const
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| 356 | {
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| 357 | return fCaps.type&VID_TYPE_CAPTURE;
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| 358 | }
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| 359 |
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| 360 | // -------------------------------------------------------------
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| 361 | //
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| 362 | // Returns the number of frame buffers which can be used
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| 363 | //
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| 364 | Int_t MVideo::GetNumBuffers() const
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| 365 | {
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| 366 | return fBuffer.frames;
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| 367 | }
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| 368 |
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| 369 | // -------------------------------------------------------------
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| 370 | //
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| 371 | // Maximum width of the frame which can be captured
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| 372 | //
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| 373 | Int_t MVideo::GetWidth() const
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| 374 | {
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| 375 | return fCaps.maxwidth;
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| 376 | }
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| 377 |
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| 378 | // -------------------------------------------------------------
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| 379 | //
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| 380 | // Maximum height of the frame which can be captured
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| 381 | //
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| 382 | Int_t MVideo::GetHeight() const
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| 383 | {
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| 384 | return fCaps.maxheight;
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| 385 | }
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| 386 |
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| 387 | // -------------------------------------------------------------
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| 388 | //
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| 389 | // Return the device type as string
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| 390 | //
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| 391 | TString MVideo::GetDevType(int type) const
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| 392 | {
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| 393 | TString rc;
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| 394 | if (CanCapture())
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| 395 | rc += " capture";
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| 396 | if (type&VID_TYPE_TUNER)
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| 397 | rc += " tuner";
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| 398 | if (type&VID_TYPE_TELETEXT)
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| 399 | rc += " teletext";
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| 400 | if (type&VID_TYPE_OVERLAY)
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| 401 | rc += " overlay";
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| 402 | if (type&VID_TYPE_CHROMAKEY)
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| 403 | rc += " chromakey";
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| 404 | if (type&VID_TYPE_CLIPPING)
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| 405 | rc += " clipping";
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| 406 | if (type&VID_TYPE_FRAMERAM)
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| 407 | rc += " frameram";
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| 408 | if (type&VID_TYPE_SCALES)
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| 409 | rc += " scales";
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| 410 | if (type&VID_TYPE_MONOCHROME)
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| 411 | rc += " monochrom";
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| 412 | if (type&VID_TYPE_SUBCAPTURE)
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| 413 | rc += " subcapature";
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| 414 | return rc;
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| 415 | }
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| 416 |
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| 417 | // -------------------------------------------------------------
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| 418 | //
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| 419 | // Return the channel flags as string
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| 420 | //
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| 421 | TString MVideo::GetChannelFlags(Int_t flags) const
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| 422 | {
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| 423 | TString rc = "video";
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| 424 | if (flags&VIDEO_VC_TUNER)
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| 425 | rc += " tuner";
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| 426 | if (flags&VIDEO_VC_AUDIO)
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| 427 | rc += " audio";
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| 428 | return rc;
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| 429 | }
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| 430 |
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| 431 | // -------------------------------------------------------------
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| 432 | //
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| 433 | // Return the channel type as string
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| 434 | //
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| 435 | TString MVideo::GetChannelType(Int_t type) const
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| 436 | {
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| 437 | if (type&VIDEO_TYPE_TV)
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| 438 | return "TV";
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| 439 | if (type&VIDEO_TYPE_CAMERA)
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| 440 | return "camera";
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| 441 | return "unknown";
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| 442 | }
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| 443 |
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| 444 | // -------------------------------------------------------------
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| 445 | //
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| 446 | // Return the palette pal as string
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| 447 | //
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| 448 | TString MVideo::GetPalette(Int_t pal) const
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| 449 | {
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| 450 | if (pal&VIDEO_PALETTE_GREY)
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| 451 | return "Linear intensity grey scale";
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| 452 | if (pal&VIDEO_PALETTE_HI240)
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| 453 | return "BT848 8-bit color cube";
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| 454 | if (pal&VIDEO_PALETTE_RGB565)
|
|---|
| 455 | return "RGB565 packed into 16-bit words";
|
|---|
| 456 | if (pal&VIDEO_PALETTE_RGB555)
|
|---|
| 457 | return "RGB555 packed into 16-bit words, top bit undefined";
|
|---|
| 458 | if (pal&VIDEO_PALETTE_RGB24)
|
|---|
| 459 | return "RGB888 packed into 24-bit words";
|
|---|
| 460 | if (pal&VIDEO_PALETTE_RGB32)
|
|---|
| 461 | return "RGB888 packed into the low three bytes of 32-bit words. Top bits undefined.";
|
|---|
| 462 | if (pal&VIDEO_PALETTE_YUV422)
|
|---|
| 463 | return "Video style YUV422 - 8-bit packed, 4-bit Y, 2-bits U, 2-bits V";
|
|---|
| 464 | if (pal&VIDEO_PALETTE_YUYV)
|
|---|
| 465 | return "YUYV";
|
|---|
| 466 | if (pal&VIDEO_PALETTE_UYVY)
|
|---|
| 467 | return "UYVY";
|
|---|
| 468 | if (pal&VIDEO_PALETTE_YUV420)
|
|---|
| 469 | return "YUV420";
|
|---|
| 470 | if (pal&VIDEO_PALETTE_YUV411)
|
|---|
| 471 | return "YUV411";
|
|---|
| 472 | if (pal&VIDEO_PALETTE_RAW)
|
|---|
| 473 | return "Raw capture (Bt848)";
|
|---|
| 474 | if (pal&VIDEO_PALETTE_YUV422P)
|
|---|
| 475 | return "YUV 4:2:2 planar";
|
|---|
| 476 | if (pal&VIDEO_PALETTE_YUV411P)
|
|---|
| 477 | return "YUV 4:1:1 planar";
|
|---|
| 478 |
|
|---|
| 479 | return "unknown";
|
|---|
| 480 | }
|
|---|
| 481 |
|
|---|
| 482 | // -------------------------------------------------------------
|
|---|
| 483 | //
|
|---|
| 484 | // Print informations about the device, the capabilities, the
|
|---|
| 485 | // channel and all available information
|
|---|
| 486 | //
|
|---|
| 487 | void MVideo::Print() const
|
|---|
| 488 | {
|
|---|
| 489 | gLog << all;
|
|---|
| 490 |
|
|---|
| 491 | gLog << "Device " << fPath << " " << (IsOpen()?"open":"closed") << "." << endl;
|
|---|
| 492 |
|
|---|
| 493 | if (!IsOpen())
|
|---|
| 494 | return;
|
|---|
| 495 |
|
|---|
| 496 | gLog << " - Name: " << fCaps.name << endl;
|
|---|
| 497 | gLog << " - DevType: " << GetDevType(fCaps.type) << endl;
|
|---|
| 498 | gLog << " - Channels: " << fCaps.channels << endl;
|
|---|
| 499 | gLog << " - Audios: " << fCaps.audios << endl;
|
|---|
| 500 | gLog << " - Size: ";
|
|---|
| 501 | gLog << fCaps.minwidth << "x" << fCaps.minheight << " to ";
|
|---|
| 502 | gLog << fCaps.maxwidth << "x" << fCaps.maxheight << endl;
|
|---|
| 503 | gLog << endl;
|
|---|
| 504 | if (fChannel.channel>=0)
|
|---|
| 505 | {
|
|---|
| 506 | gLog << " - Channel: " << fChannel.channel << " (" << fChannel.name << ")" << endl;
|
|---|
| 507 | gLog << " - IsA: " << GetChannelType(fChannel.type) << " with " << GetChannelFlags(fChannel.flags) << endl;
|
|---|
| 508 | //if (fChannel.flags&VIDEO_VC_NORM)
|
|---|
| 509 | gLog << " - Norm: " << fChannel.norm << endl;
|
|---|
| 510 | gLog << endl;
|
|---|
| 511 | }
|
|---|
| 512 | gLog << " - Brightness: " << fProp.brightness << endl;
|
|---|
| 513 | gLog << " - Hue: " << fProp.hue << endl;
|
|---|
| 514 | gLog << " - Color: " << fProp.colour << endl;
|
|---|
| 515 | gLog << " - Contrast: " << fProp.contrast << endl;
|
|---|
| 516 | gLog << " - Whiteness: " << fProp.whiteness << endl;
|
|---|
| 517 | gLog << " - Depth: " << fProp.depth << endl;
|
|---|
| 518 | gLog << " - Palette: " << GetPalette(fProp.palette) << " (" << fProp.palette << ")" << endl;
|
|---|
| 519 | gLog << endl;
|
|---|
| 520 |
|
|---|
| 521 | gLog << " - BufferSize: 0x" << hex << fBuffer.size << " (" << dec << fBuffer.frames << " frames)" << endl;
|
|---|
| 522 | gLog << " - Offsets: " << hex;
|
|---|
| 523 | for (int i=0; i<fBuffer.frames; i++)
|
|---|
| 524 | gLog << " 0x" << fBuffer.offsets[i];
|
|---|
| 525 | gLog << dec << endl;
|
|---|
| 526 | }
|
|---|
| 527 |
|
|---|
| 528 | /*
|
|---|
| 529 | void MVideo::SetPicPar(int bright, int hue, int contrast)
|
|---|
| 530 | {
|
|---|
| 531 | struct video_picture pict;
|
|---|
| 532 |
|
|---|
| 533 | Ioctl(VIDIOCGPICT, &pict); // get
|
|---|
| 534 |
|
|---|
| 535 | if (contrast != -1)
|
|---|
| 536 | pict.contrast = contrast;
|
|---|
| 537 |
|
|---|
| 538 | if (bright != -1)
|
|---|
| 539 | pict.brightness = bright;
|
|---|
| 540 |
|
|---|
| 541 | if (hue != -1)
|
|---|
| 542 | pict.hue = hue;
|
|---|
| 543 |
|
|---|
| 544 | Ioctl(VIDIOCSPICT, &pict); //set
|
|---|
| 545 | }
|
|---|
| 546 |
|
|---|
| 547 | void MVideo::GetPicPar(int *bright, int *hue, int *contrast)
|
|---|
| 548 | {
|
|---|
| 549 | struct video_picture pict;
|
|---|
| 550 |
|
|---|
| 551 | Ioctl(VIDIOCGPICT, &pict); // get
|
|---|
| 552 |
|
|---|
| 553 | *contrast = pict.contrast;
|
|---|
| 554 | *bright = pict.brightness;
|
|---|
| 555 | *hue = pict.hue;
|
|---|
| 556 | }
|
|---|
| 557 | */
|
|---|
