Google Tango C API connected onFrameAvailable callback never called

Question

I'm trying to retrieve the TANGO_CAMERA_COLOR image pixel data by registering a callback function using

static void onFrameAvailable( void* context, const TangoCameraId id, const TangoImageBuffer* buffer )
{

    LOGVI( "\nGOOGLE TANGO FRAME AVAILABLE" );

}

...

if(TangoService_connectOnFrameAvailable( TANGO_CAMERA_COLOR, NULL, onFrameAvailable ) == TANGO_SUCCESS)
{
    LOGVI( "\nGOOGLE TANGO ONFRAMEAVAILABLE CONNECTED" );
}

I actually get my success log as output but the callback function is never called.

output:

01-13 12:04:02.655: I/tango_client_api(187): Tango Service: connect, internal status 0
01-13 12:04:02.655: I/VR(8529): GOOGLE TANGO CONNECTED
01-13 12:04:02.655: I/VR(8529): GOOGLE TANGO EVENT HANDLER CONNECTED
01-13 12:04:02.656: I/tango_client_api(187): Tango Service: getCameraIntrinsics, internal status 0
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE WIDTH 1280
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE HEIGHT 720
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE FOCAL X 1039.630000
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE FOCAL Y 1039.900000
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE PRINCIPAL X 634.922000
01-13 12:04:02.656: I/VR(8529): GOOGLE TANGO CAMERA IMAGE PRINCIPAL Y 362.981000
01-13 12:04:02.656: I/tango_client_api(187): Tango Service: connectSurface, internal status 0
01-13 12:04:02.657: I/VR(8529): GOOGLE TANGO ONFRAMEAVAILABLE CONNECTED
01-13 12:04:02.694: I/chromium(8529): [INFO:async_pixel_transfer_manager_android.cc(56)] Async pixel transfers not supported
01-13 12:04:02.823: I/Camera3-OutputStream(168): enqueue first Preview frame or first video frame
01-13 12:04:02.825: I/native-camera(187): Dropping VGA with too much latency 92240.015085 > 0.000000 + 2 * 0.033328
01-13 12:04:02.899: I/native-camera(187): VGA Stats: 3 frames, 0 locked_buffer_drops, 0 sensor_hub_drops, 1 ambiguous, 0 feature_tracking_drops
01-13 12:04:02.899: I/native-camera(187): COLOR Stats: 0 frames, 0 locked_buffer_drops, 0 sensor_hub_drops, 0 ambiguous

... what follows are only event notifications like FisheyeUnderExposed, TooFewFeaturesTracked

I'm using C-API version Descartes. The permissions in the Manifest are defined. What should be necessary for the callback to work ( init, connecting, .. )?

Could you provide more information from the logcat? It looks like you filtered only your application's output. — xuguo, Jan 12 '15 at 19:57

score 1 · Answer 1 · answered Jan 12 '15 at 19:57

1

One thing worth to check is the permission. To use the color camera, you will need to add the camera permission to the manifest file.

answered Jan 12 '15 at 19:57

xuguo

1,816
1
11
15

is already in my AndroidManifest.xml. Did you mean that one? – mastamonito Jan 14 '15 at 08:17

score 1 · Answer 2 · answered Jan 16 '15 at 13:26

Try building the augmented reality C sample - I hacked it up (poorly) to do exactly this and it worked OK - AquireTangoImage gets called (I chopped the guts out cause the call happens and then I fail to update the texture :-)) - ConnectTexture is part of the original sample, I just added the secondary connectOnFrameAvailable - note that, at least in my experience, as soon as you do start getting callbacks you stop getting texture updates :-(

GLuint cached_single_texture_id;
void AcquireTangoImage(void *context, TangoCameraId id, const TangoImageBuffer *buffer)
{
    TangoData* td = (TangoData*)context;


}
void TangoData::ConnectTexture(GLuint texture_id) {
    cached_single_texture_id = texture_id;
  if (TangoService_connectTextureId(TANGO_CAMERA_COLOR, texture_id, nullptr,
                                    nullptr) == TANGO_SUCCESS) {
    LOGI("TangoService_connectTextureId(): Success!");
  } else {
    LOGE("TangoService_connectTextureId(): Failed!");
  }
  if (TangoService_connectOnFrameAvailable(TANGO_CAMERA_COLOR, this, AcquireTangoImage) == TANGO_SUCCESS) {
      LOGI("TangoService_connectOnFrameAvailable(): Success!");
  }
  else {
      LOGE("TangoService_connectOnFrameAvailable(): Failed!");
  }
}

On a related note, if you got the Hilbert release of the Tango core on 2/13 or thereabouts, seems the image format has changed from YUV to straight RGB - indicator is that stride == width — Mark Mullin, Feb 14 '15 at 12:05

Google Tango C API connected onFrameAvailable callback never called

2 Answers2