Re: [libdc1394-devel] Dynamic Format 7 Parameter changes
Capture and control API for IIDC compliant cameras
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Re: [libdc1394-devel] Dynamic Format 7 Parameter changes
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From: Damien D. <da...@do...> - 2005-06-23 02:37:06
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Hi Paul,
On Wed, 2005-06-22 at 17:07 -0500, pj...@en... wrote:
> Damien,
>
> I can't figure out what's going on for the life of me. I've attached actual
> code to show what it is I'm doing.
>
> When this code is run, the camera is already setup and running. It always runs
> until the second time it checks the ISO status. At that point, ISO status is
> always off, even though the call to start_iso_transmission always succeeds.
>
> Its getting a bit irritating really.
I can understand that...
> I'm not exactly sure what you meant by checking the max byte_per_packet. I
> think I've done it right. But then again, I'm not too sure.
It seems that you are already checking the bpp so this should not be the
problem. To be perfectly sure replace the call for "recommended" bpp by
a request for the max bpp.
> Its still exhibiting the same behavior as before. That coriander can't start
> ISO transmission after this code fails, but if I start and stop its receive
> service, ISO transmissions start working again. Grrrrr.
Another idea: the sizes that you specify might not be allowed by the
camera. Some cameras only accept a very limited number of
positions/sizes (Sony). You can play with coriander to see which sizes
are allowed.
> Oh and I must apologize for cursing you so many times while going through the
> coriander source.
That's OK, I do it too. Including cursing myself ;-)
> All those threads just make following the execution so much fun.
Yeah it's kind of ugly but it works. Somewhat. ;-)
Another thing to try: after setting the camera in the 'bad state' try
setting it back to the original settings (size/pos/bpp). If this unlocks
the camera it means that some combination of those parameters is wrong.
You can also test something more stupid: set the camera size/pos/bpp to
the current values (therefor changing nothing). If it still does not
work then it means the problem is somewhere else. If it works, wrong
parameters are probably the cause.
At last, try adding a 100ms delay between each command. Some cameras
(Sony again) require 50ms delay minimum because when you change some
parameters it has to recompute other registers (like the max allowed
bpp).
Well, I still have another idea: add some exit() statement in the
StartIsoThread function. Executing coriander only up to a certain point
and then launching your program might give you a clue on what resets the
camera in a good state.
Damien
> int top, left, width, height ;
>
> unsigned int bpp ;
> dc1394bool_t iso_status ;
> string camera_interface = theConfigObject->GetCameraFrameInterface() ;
>
> left = 0 ;
> top = 224 ;
> width = 672 ;
> height = 64 ;
>
> if( dc1394_stop_iso_transmission (_handle, _camera.node) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to stop ISO transmission.\n" ) ;
> return false ;
> }
>
> sleep( 1 ) ;
>
> if( dc1394_get_iso_status( _handle, _camera.node, &iso_status ) !=
> DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to get ISO transmission status.\n" ) ;
> return false ;
> }
> if( iso_status )
> {
> fprintf( stderr, "ERROR: ISO Transmission refuses to stop.\n" ) ;
> return false ;
> }
>
> if( dc1394_dma_unlisten (_handle, &_camera) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to stop dma listening.\n" ) ;
> return false ;
> }
>
> if( dc1394_dma_release_camera (_handle, &_camera) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to shutdown dma connection.\n" ) ;
> return false ;
> }
>
> if( dc1394_set_format7_image_position( _handle, _camera.node, _mode, 0, 0)
> != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to position image at origin.\n" ) ;
> return false ;
> }
>
> if( dc1394_set_format7_image_size( _handle, _camera.node, _mode, width,
> height ) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to set image size.\n" ) ;
> return false ;
> }
>
> if( dc1394_set_format7_image_position( _handle, _camera.node, _mode, left,
> top) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to set image position.\n" ) ;
> return false ;
> }
>
> if( dc1394_query_format7_recommended_byte_per_packet( _handle, _camera.node,
> _mode, &bpp ) != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to get maximum number of bytes per
> packet.\n" ) ;
> return false ;
> }
>
> fprintf( stderr, "Recommended BPP: %d\n", bpp ) ;
>
> if( dc1394_set_format7_byte_per_packet( _handle, _camera.node, _mode, bpp )
> != DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to set bytes per packet.\n" ) ;
> return false ;
> } if (
> dc1394_dma_setup_format7_capture (
> _handle,
> _camera_nodes [0],
> _channel,
> _mode,
> _speed,
> bpp,
> left,
> top,
> width,
> height,
> _num_dma_buffers,
> _drop_frames,
> camera_interface.c_str(),
> &_camera
> )
> != DC1394_SUCCESS)
> {
> fprintf (stderr, "ERROR: Failed to setup Format 7 Capture for
> focusing.\n") ;
> return false ;
> }
>
> if( dc1394_start_iso_transmission( _handle, _camera.node ) != DC1394_SUCCESS)
> {
> fprintf (stderr, "Unable to start camera iso transmission\n");
> return false ;
> }
>
> if( dc1394_get_iso_status( _handle, _camera.node, &iso_status ) !=
> DC1394_SUCCESS )
> {
> fprintf( stderr, "ERROR: Failed to get ISO transmission status.\n" ) ;
> return false ;
> }
>
> if( !iso_status )
> {
> fprintf( stderr, "ERROR: ISO Transmission refuses to start.\n" ) ;
> return false ;
> }
>
> return true;
>
>
>
--
_ Damien 'Takahara' Douxchamps, PhD
('- Post-doctoral investigator
//\ Image Processing Group, Nara Institute of Science and Technology
V_/_ http://chihara.aist-nara.ac.jp/
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