127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
//
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// ZoneMinder Local Camera Class Interface, $Date$, $Revision$
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// Copyright (C) 2003 Philip Coombes
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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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 General Public License for more details.
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//
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// You should have received a copy of the GNU 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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//
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#ifndef ZM_LOCAL_CAMERA_H
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#define ZM_LOCAL_CAMERA_H
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <linux/videodev.h>
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#include "zm_camera.h"
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//
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// Class representing 'local' cameras, i.e. those which are
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// directly connect to the host machine and which are accessed
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// via a video interface.
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//
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class LocalCamera : public Camera
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{
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protected:
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int device;
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int channel;
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int format;
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protected:
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static int m_cap_frame;
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static int m_sync_frame;
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static video_mbuf m_vmb;
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static video_mmap *m_vmm;
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static int m_videohandle;
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static unsigned char *m_buffer;
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static int camera_count;
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public:
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LocalCamera( int p_device, int p_channel, int p_format, int p_width, int p_height, int p_colours, bool p_capture=true );
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~LocalCamera();
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void Initialise();
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void Terminate();
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unsigned int Device() const { return( device ); }
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unsigned int Channel() const { return( channel ); }
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unsigned int Format() const { return( format ); }
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int PreCapture()
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{
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//Info(( "%s: Capturing image\n", id ));
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if ( camera_count > 1 )
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{
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//Info(( "Switching\n" ));
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struct video_channel vs;
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vs.channel = channel;
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//vs.norm = VIDEO_MODE_AUTO;
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vs.norm = format;
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vs.flags = 0;
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vs.type = VIDEO_TYPE_CAMERA;
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if(ioctl(m_videohandle, VIDIOCSCHAN, &vs))
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{
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Error(( "Failed to set camera source %d: %s\n", channel, strerror(errno) ));
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return( -1 );
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}
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}
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//Info(( "MC:%d\n", m_videohandle ));
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if ( ioctl(m_videohandle, VIDIOCMCAPTURE, &m_vmm[m_cap_frame]) )
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{
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Error(( "Capture failure for frame %d: %s\n", m_cap_frame, strerror(errno)));
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return( -1 );
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}
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m_cap_frame = (m_cap_frame+1)%m_vmb.frames;
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return( 0 );
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}
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unsigned char *PostCapture()
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{
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//Info(( "%s: Capturing image\n", id ));
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if ( ioctl(m_videohandle, VIDIOCSYNC, &m_sync_frame) )
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{
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Error(( "Sync failure for frame %d: %s\n", m_sync_frame, strerror(errno)));
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return( 0 );
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}
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unsigned char *buffer = m_buffer+(m_sync_frame*m_vmb.size/m_vmb.frames);
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m_sync_frame = (m_sync_frame+1)%m_vmb.frames;
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return( buffer );
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}
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int PostCapture( Image &image )
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{
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//Info(( "%s: Capturing image\n", id ));
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if ( ioctl(m_videohandle, VIDIOCSYNC, &m_sync_frame) )
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{
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Error(( "Sync failure for frame %d: %s\n", m_sync_frame, strerror(errno)));
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return( -1 );
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}
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unsigned char *buffer = m_buffer+(m_sync_frame*m_vmb.size/m_vmb.frames);
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m_sync_frame = (m_sync_frame+1)%m_vmb.frames;
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image.Assign( width, height, colours, buffer );
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return( 0 );
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}
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static bool GetCurrentSettings( int device, char *output, bool verbose );
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};
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#endif // ZM_LOCAL_CAMERA_H
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