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# (C) 2008 Hans de Goede <hdegoede@redhat.com>
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#endif /* __cplusplus */
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#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
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/* Point this to a FILE opened for writing when you want to log error and
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status messages to a file, when NULL errors will get send to stderr */
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LIBV4L_PUBLIC extern FILE *v4l1_log_file;
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/* Just like your regular open/close/etc, except that when opening a v4l2
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capture only device, full v4l1 emulation is done including emulating the
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often not implemented in v4l2 drivers CGMBUF ioctl and v4l1 style mmap call
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Format conversion is done if necessary when capturing. That is if you
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(try to) set a capture format which is not supported by the cam, but is
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supported by libv4lconvert then SPICT will succeed and on SYNC / read the
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data will be converted for you and returned in the request format.
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Note that currently libv4l1 depends on the kernel v4l1 compatibility layer
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for: 1) Devices which are not capture only, 2) Emulation of many basic
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v4l1 ioctl's which require no driver specific handling.
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Note that no functionality is added to v4l1 devices, so if for example an
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obscure v4l1 device is opened which only supports some weird capture format
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then libv4l1 will not be of any help (in this case it would be best to get
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the driver converted to v4l2, as v4l2 has been designed to include weird
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capture formats, like hw specific bayer compression methods).
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LIBV4L_PUBLIC int v4l1_open (const char *file, int oflag, ...);
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LIBV4L_PUBLIC int v4l1_close(int fd);
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LIBV4L_PUBLIC int v4l1_dup(int fd);
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LIBV4L_PUBLIC int v4l1_ioctl (int fd, unsigned long int request, ...);
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LIBV4L_PUBLIC ssize_t v4l1_read (int fd, void* buffer, size_t n);
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LIBV4L_PUBLIC void *v4l1_mmap(void *start, size_t length, int prot, int flags, int fd,
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LIBV4L_PUBLIC int v4l1_munmap(void *_start, size_t length);
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#endif /* __cplusplus */
added
removed
lib/include/libv4l1.h
