dlls/avicap32/v4l.c

   1 /*
   2  * Copyright 2002 Dmitry Timoshkov for CodeWeavers
   3  * Copyright 2005 Maarten Lankhorst
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  */
  19
  20 #if 0
  21 #pragma makedep unix
  22 #endif
  23
  24 #include "config.h"
  25
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <unistd.h>
  31 #include <sys/stat.h>
  32 #include <sys/ioctl.h>
  33 #ifdef HAVE_LINUX_VIDEODEV2_H
  34 # include <linux/videodev2.h>
  35 #endif
  36
  37 #include "ntstatus.h"
  38 #define WIN32_NO_STATUS
  39 #include "windef.h"
  40 #include "winternl.h"
  41 #include "wine/debug.h"
  42
  43 #include "unixlib.h"
  44
  45 #ifdef HAVE_LINUX_VIDEODEV2_H
  46
  47 WINE_DEFAULT_DEBUG_CHANNEL(avicap);
  48
  49 static int xioctl(int fd, int request, void *arg)
  50 {
  51     int ret;
  52
  53     do
  54         ret = ioctl(fd, request, arg);
  55     while (ret < 0 && errno == EINTR);
  56
  57     return ret;
  58 }
  59
  60 static void v4l_umbstowcs(const char *src, DWORD srclen, WCHAR *dst, DWORD dstlen)
  61 {
  62     DWORD ret = ntdll_umbstowcs(src, srclen, dst, dstlen - 1);
  63
  64     dst[ret] = 0;
  65 }
  66
  67 static NTSTATUS get_device_desc(void *args)
  68 {
  69     struct get_device_desc_params *params = args;
  70     struct v4l2_capability caps = {{0}};
  71     char device[16];
  72     struct stat st;
  73     int fd;
  74
  75     snprintf(device, sizeof(device), "/dev/video%u", params->index);
  76
  77     if (stat(device, &st) < 0)
  78     {
  79         /* This is probably because the device does not exist */
  80         WARN("Failed to stat %s: %s\n", device, strerror(errno));
  81         return STATUS_OBJECT_NAME_NOT_FOUND;
  82     }
  83
  84     if (!S_ISCHR(st.st_mode))
  85     {
  86         ERR("%s is not a character device.\n", device);
  87         return STATUS_OBJECT_TYPE_MISMATCH;
  88     }
  89
  90     if ((fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
  91     {
  92         ERR("%s: Failed to open: %s\n", device, strerror(errno));
  93         return STATUS_UNSUCCESSFUL;
  94     }
  95
  96     if (!xioctl(fd, VIDIOC_QUERYCAP, &caps))
  97     {
  98         BOOL is_capture_device;
  99 #ifdef V4L2_CAP_DEVICE_CAPS
 100         if (caps.capabilities & V4L2_CAP_DEVICE_CAPS)
 101             is_capture_device = caps.device_caps & V4L2_CAP_VIDEO_CAPTURE;
 102         else
 103 #endif
 104             is_capture_device = caps.capabilities & V4L2_CAP_VIDEO_CAPTURE;
 105         if (is_capture_device)
 106         {
 107             char version[CAP_DESC_MAX];
 108             int ret;
 109
 110             v4l_umbstowcs((char *)caps.card, strlen((char *)caps.card),
 111                     params->name, ARRAY_SIZE(params->name));
 112
 113             ret = snprintf(version, ARRAY_SIZE(version), "%s v%u.%u.%u", (char *)caps.driver,
 114                     (caps.version >> 16) & 0xff, (caps.version >> 8) & 0xff, caps.version & 0xff);
 115             v4l_umbstowcs(version, ret, params->version, ARRAY_SIZE(params->version));
 116         }
 117         close(fd);
 118         return is_capture_device ? STATUS_SUCCESS : STATUS_UNSUCCESSFUL;
 119     }
 120
 121     /* errno 515 is used by some webcam drivers for unknown IOCTL commands. */
 122     ERR("Failed to get capabilities for %s: %s\n", device, strerror(errno));
 123
 124     close(fd);
 125     return STATUS_UNSUCCESSFUL;
 126 }
 127
 128 const unixlib_entry_t __wine_unix_call_funcs[] =
 129 {
 130     get_device_desc,
 131 };
 132
 133 #ifdef _WIN64
 134
 135 const unixlib_entry_t __wine_unix_call_wow64_funcs[] =
 136 {
 137     get_device_desc,
 138 };
 139
 140 #endif  /* _WIN64 */
 141
 142 #endif /* HAVE_LINUX_VIDEODEV2_H */