/*
    unicap
    Copyright (C) 2004  Arne Caspari

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/**
   xv_display.c

   This example demonstrates how to display a live video stream using XVideo extensions

 **/


#include <stdlib.h>
#include <stdio.h>
#include <unicap.h>
#include <status.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xvlib.h>
#include <X11/keysym.h>

#include "xv.h"

#define UYVY 0x59565955 /* UYVY (packed, 16 bits) */

int main( int argc, char **argv )
{
   unicap_handle_t handle;
   unicap_device_t device;
   unicap_format_t format_spec;
   unicap_format_t format;
   unicap_data_buffer_t buffer;
   unicap_data_buffer_t *returned_buffer;
   
   int i;

   int quit=0;

   XEvent xevent;
   XGCValues xgcvalues;
   Display *display=NULL;
   Window window=(Window)NULL;
   GC gc;
   int connection=-1;  
   xv_handle_t xvhandle;



   printf( "select video device\n" );
   for( i = 0; SUCCESS( unicap_enumerate_devices( NULL, &device, i ) ); i++ )
   {
       printf( "%i: %s\n", i, device.identifier );
   }
   if( --i > 0 )
   {
       printf( "Select video capture device: %d" );
       scanf( "%d", &i );
   }

   if( !SUCCESS( unicap_enumerate_devices( NULL, &device, i ) ) )
   {
       fprintf( stderr, "Failed to get info for device '%s'\n", device.identifier );
       exit( 1 );
   }

   /*
     Acquire a handle to this device
    */
   if( !SUCCESS( unicap_open( &handle, &device ) ) )
   {
       fprintf( stderr, "Failed to open device: %s\n", device.identifier );
       exit( 1 );
   }

   printf( "Opened video capture device: %s\n", device.identifier );

   /*
     Create a format specification to limit the list of formats returned by 
     unicap_enumerate_formats to the ones with the color format 'UYVY'
    */
   unicap_void_format( &format_spec );
   format_spec.fourcc = UYVY;
   
   /*
     Get the list of video formats of the colorformat UYVY
    */
   for( i = 0; SUCCESS( unicap_enumerate_formats( handle, &format_spec, &format, i ) ); i++ )
   {
       if( format.fourcc == UYVY )
       {
           printf( "%d: %s [%dx%d]\n", 
                   i,
                   format.identifier, 
                   format.size.width, 
                   format.size.height );
       }
   }
   if( --i > 0 )
   {
       printf( "Select video format: " );
       scanf( "%d", &i );
   }
   if( !SUCCESS( unicap_enumerate_formats( handle, &format_spec, &format, i ) ) )
   {
       fprintf( stderr, "Failed to get video format\n" );
       exit( 1 );
   }
   
   /*
     Set this video format
    */
   if( !SUCCESS( unicap_set_format( handle, &format ) ) )
   {
       fprintf( stderr, "Failed to set video format\n" );
       exit( 1 );
   }
   if( !SUCCESS( unicap_get_format( handle, &format ) ) )
   {
       fprintf( stderr, "Failed to get video format\n" );
       exit( 1 );
   }

   /*
     Initialize the image buffer
    */
   memset( &buffer, 0x0, sizeof( unicap_data_buffer_t ) );

   /*
     Initialize Xv and create a X window
    */
   xvhandle = malloc( sizeof( struct _xv_handle ) );
   if( !xvhandle )
   {
       fprintf( stderr, "Failed to allocate memory for xvhandle!\n" );
       exit( 1 );
   }
   
   display = XOpenDisplay( getenv("DISPLAY") );
   if( !display )
   {
       fprintf( stderr, "Failed to open X display\n" );
       exit( 1 );
   }
   
   if( xv_init( xvhandle,
                display,
                format.fourcc,
                format.size.width,
                format.size.height,
                format.bpp ) < 0 )
   {
       fprintf( stderr, "Failed to initialize Xv\n" );
       exit( 1 );
   }

   window = XCreateSimpleWindow( display, DefaultRootWindow( display ), 0, 0,
                                 format.size.width, format.size.height,
                                 0, WhitePixel( display, DefaultScreen( display ) ), 0x010203 );
   
   XSelectInput(display,window,StructureNotifyMask|KeyPressMask);
   XMapWindow(display,window);
   connection=ConnectionNumber(display);
   gc=XCreateGC(display,window,0,&xgcvalues);
   
   xvhandle->drawable = window;
   xvhandle->gc = gc;
   
   /*
    */
   buffer.data = xvhandle->image->data;
   printf( "buffer_size: %d\n" , format.buffer_size );
   
   if( !buffer.data )
   {
       fprintf( stderr, "Failed to allocate memory for the image buffer\n" );
       exit( 1 );
   }
   
   /*
     Start the capture process on the device
    */
   if( !SUCCESS( unicap_start_capture( handle ) ) )
   {
       fprintf( stderr, "Failed to start capture on device: %s\n", device.identifier );
       exit( 1 );
   }
   

   while( !quit )
   {
       /*
         Queue the buffer
         
         The buffer now gets filled with image data by the capture device
       */
       if( !SUCCESS( unicap_queue_buffer( handle, &buffer ) ) )
       {
           fprintf( stderr, "Failed to queue a buffer on device: %s\n", device.identifier );
/*             exit( 1 ); */
       }
       
       /*
         Wait until the image buffer is ready
       */
       if( !SUCCESS( unicap_wait_buffer( handle, &returned_buffer ) ) )
       {
           fprintf( stderr, "Failed to wait for buffer on device: %s\n", device.identifier );
/*             exit( 1 ); */
       }

       /*
         Display the video data
        */
       xv_update_image( xvhandle,
                        returned_buffer->data,
                        returned_buffer->buffer_size,
                        returned_buffer->format.size.width,
                        returned_buffer->format.size.height );
/*         XFlush(display); */
       
       while(XPending(display)>0)
       {
           XNextEvent(display,&xevent);
           switch(xevent.type)
           {
               case XK_q:
               case XK_Q:
                   quit = 1;
                   break;
                   
               default:
                   break;
           }
       }
       
   }
   
   /*
     Stop the device
    */
   if( !SUCCESS( unicap_stop_capture( handle ) ) )
   {
       fprintf( stderr, "Failed to stop capture on device: %s\n", device.identifier );
   }

   /*
     Close the device 

     This invalidates the handle
    */
   if( !SUCCESS( unicap_close( handle ) ) )
   {
       fprintf( stderr, "Failed to close the device: %s\n", device.identifier );
   }

   return 0;
}