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//------------------------------------------------------------------------
// Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#ifndef _ZBAR_VIDEO_H_
#define _ZBAR_VIDEO_H_
/// @file
/// Video Input C++ wrapper
#ifndef _ZBAR_H_
#error "include zbar.h in your application, **not** zbar/Video.h"
#endif
#include "Image.h"
namespace zbar
{
/// mid-level video source abstraction.
/// captures images from a video device
class Video
{
public:
/// constructor.
Video(zbar_video_t *video = NULL)
{
if (video)
_video = video;
else
_video = zbar_video_create();
}
/// constructor.
Video(std::string &device)
{
_video = zbar_video_create();
open(device);
}
~Video()
{
zbar_video_destroy(_video);
}
/// cast to C video object.
operator zbar_video_t *() const
{
return (_video);
}
/// open and probe a video device.
void open(std::string &device)
{
if (zbar_video_open(_video, device.c_str()))
throw_exception(_video);
}
/// close video device if open.
void close()
{
if (zbar_video_open(_video, NULL))
throw_exception(_video);
}
/// initialize video using a specific format for debug.
/// see zbar_video_init()
void init(unsigned long fourcc)
{
if (zbar_video_init(_video, fourcc))
throw_exception(_video);
}
/// initialize video using a specific format for debug.
/// see zbar_video_init()
void init(std::string &format)
{
unsigned int fourcc = zbar_fourcc_parse(format.c_str());
if (zbar_video_init(_video, fourcc))
throw_exception(_video);
}
/// retrieve file descriptor associated with open *nix video device.
/// see zbar_video_get_fd()
int get_fd()
{
return (zbar_video_get_fd(_video));
}
/// retrieve current output image width.
/// see zbar_video_get_width()
int get_width()
{
return (zbar_video_get_width(_video));
}
/// retrieve current output image height.
/// see zbar_video_get_height()
int get_height()
{
return (zbar_video_get_height(_video));
}
/// start/stop video capture.
/// see zbar_video_enable()
void enable(bool enable = true)
{
if (zbar_video_enable(_video, enable))
throw_exception(_video);
}
/// retrieve next captured image.
/// see zbar_video_next_image()
Image next_image()
{
zbar_image_t *img = zbar_video_next_image(_video);
if (!img)
throw_exception(_video);
return (Image(img));
}
/// request a preferred size for the video image from the device.
/// see zbar_video_request_size()
/// @since 0.6
void request_size(int width, int height)
{
zbar_video_request_size(_video, width, height);
}
/// request a preferred driver interface version for debug/testing.
/// see zbar_video_request_interface()
/// @since 0.6
void request_interface(int version)
{
zbar_video_request_interface(_video, version);
}
/// request a preferred I/O mode for debug/testing.
/// see zbar_video_request_iomode()
/// @since 0.7
void request_iomode(int iomode)
{
if (zbar_video_request_iomode(_video, iomode))
throw_exception(_video);
}
/// get the information about a control at a given index
/// see zbar_video_get_controls()
/// @since 0.11
struct video_controls_s *get_controls(int index)
{
return (zbar_video_get_controls(_video, index));
}
/// set the value on an integer control
/// see zbar_video_set_control_n()
/// @since 0.11
int set_control(const char *name, int value)
{
return zbar_video_set_control(_video, name, value);
}
/// set the value on a boolean control
/// see zbar_video_set_control_b()
/// @since 0.11
int set_control(const char *name, bool value)
{
return zbar_video_set_control(_video, name, value ? 1 : 0);
}
/// get the value on a boolean control
/// see zbar_video_get_control_b()
/// @since 0.11
int get_control(const char *name, int *value)
{
return zbar_video_get_control(_video, name, value);
}
/// get the value on an integer control
/// see zbar_video_get_control_n()
/// @since 0.11
int get_control(const char *name, bool *value)
{
int __value;
int ret = zbar_video_get_control(_video, name, &__value);
*value = __value ? true : false;
return ret;
}
/// get the information about a control at a given index
/// see zbar_video_get_resolutions()
/// @since 0.22
struct video_resolution_s *get_resolution(int index)
{
return (zbar_video_get_resolutions(_video, index));
}
private:
zbar_video_t *_video;
};
} // namespace zbar
#endif
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