//----------------------------------------------------------------------------
//
// Test: test_tuner
//
// Description: Iterates through each of the known local channels,
// and attempts to save an image from each of them.
//
// Setup: - Source is TV tuner
// - Tunes to each local channel sequentially
// - Uses standard window sizing
// - Saves in RGB24 format
//
//----------------------------------------------------------------------------
int test_tuner( FRAMEGRABBER* fg )
{
FRAME* frame = NULL;
char fname[32];
int i;
_T( fg_set_format( fg, VIDEO_PALETTE_RGB32 ) );
_T( fg_set_capture_window( fg, 0, 0, 320, 240 ) );
_N( frame = fg_new_compatible_frame( fg ) );
for ( i = 0; i < sizeof(local)/sizeof(CHANNEL); i++ )
{
printf( "%u. Saving %s @ %fMHz\n", i, local[i].name, local[i].freq );
_T( fg_set_channel( fg, local[i].freq ) );
// Catch up to the new tuning
_N( fg_grab_frame( fg, frame ) );
_N( fg_grab_frame( fg, frame ) );
snprintf( fname, sizeof(fname), "test_%s.ppm", local[i].name );
_T( frame_save( frame, fname ) );
}
frame_release( frame );
return 0;
}
FRAME* fg_grab( FRAMEGRABBER* fg )
{
return fg_grab_frame( fg,
frame_new( fg->window.width,
fg->window.height,
fg->picture.palette ) );
}
//----------------------------------------------------------------------------
//
// Test: test_timing
//
// Description: Grabs a series of frames, and times how long each takes
// in a tight loop that also pretends to do some "processing"
// (by sleeping).
//
// Setup: - Source is default
// - Tuned to default
// - Uses standard window sizing and format
//
//----------------------------------------------------------------------------
int test_timing( FRAMEGRABBER* fg )
{
FRAME* frame = NULL;
struct timeval start_time, end_time;
int i;
printf( "Capture timings...\n" );
_T( fg_set_channel( fg, local[0].freq ) );
_T( fg_set_format( fg, VIDEO_PALETTE_RGB32 ) );
_T( fg_set_capture_window( fg, 0, 0, 768, 576 ) );
_N( frame = frame_new( 768, 576, VIDEO_PALETTE_RGB32 ) );
for ( i = 0; i < 20; i++ )
{
gettimeofday( &start_time, NULL );
fg_grab_frame( fg, frame );
// Image crunching step would be here
usleep(35);
gettimeofday( &end_time, NULL );
// This subtraction doesn't handle wrapping
printf( "Elapsed time = %lu secs %lu usecs\n",
( end_time.tv_sec - start_time.tv_sec ),
( end_time.tv_usec - start_time.tv_usec ) );
}
return 0;
}
fg_frame *fg_grab(fg_grabber *fg)
{
fg_frame *fr = fg_frame_new(fg);
if (fr == NULL)
{
fg_debug_error("fg_grab(): ran out of memory allocating frame");
return NULL;
}
if (fg_grab_frame(fg, fr) == -1)
{
free(fr);
return NULL;
}
return fr;
}
