Use more flexible error codes

6 files changed, 112 insertions, 87 deletions

diff --git a/src/cameras/dummy.c b/src/cameras/dummy.c
index 0d6c9d1..5bb609a 100644
--- a/src/cameras/dummy.c
+++ b/src/cameras/dummy.c
@@ -159,8 +159,9 @@ static void *uca_dummy_grab_thread(void *arg)
  */
 static uint32_t uca_dummy_set_property(struct uca_camera *cam, enum uca_property_ids property, void *data)
 {
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_PROP;
     if (cam->state == UCA_CAM_RECORDING)
-        return UCA_ERR_PROP_CAMERA_RECORDING;
+        return err | UCA_ERR_IS_RECORDING;
 
     switch (property) {
         case UCA_PROP_WIDTH:
@@ -176,7 +177,7 @@ static uint32_t uca_dummy_set_property(struct uca_camera *cam, enum uca_property
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return err | UCA_ERR_INVALID;
     }
 
     return UCA_NO_ERROR;
@@ -218,7 +219,7 @@ static uint32_t uca_dummy_get_property(struct uca_camera *cam, enum uca_property
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
     }
     return UCA_NO_ERROR;
 }
@@ -258,7 +259,7 @@ uint32_t uca_dummy_register_callback(struct uca_camera *cam, uca_cam_grab_callba
         cam->callback_user = user;
     }
     else
-        return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
+        return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
 
     return UCA_NO_ERROR;
 }
@@ -266,7 +267,7 @@ uint32_t uca_dummy_register_callback(struct uca_camera *cam, uca_cam_grab_callba
 uint32_t uca_dummy_grab(struct uca_camera *cam, char *buffer, void *meta_data)
 {
     if (cam->callback != NULL)
-        return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
+        return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
 
     uca_dummy_memcpy(cam, buffer);
     cam->current_frame++;
diff --git a/src/cameras/pco.c b/src/cameras/pco.c
index 1cad698..1b9c8b8 100644
--- a/src/cameras/pco.c
+++ b/src/cameras/pco.c
@@ -14,21 +14,23 @@
 
 static uint32_t uca_pco_set_exposure(struct uca_camera *cam, uint32_t *exposure)
 {
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_PROP;
     uint32_t e, d;
     if (pco_get_delay_exposure(GET_PCO(cam), &d, &e) != PCO_NOERROR)
-        return UCA_ERR_PROP_GENERAL;
+        return err | UCA_ERR_INVALID;
     if (pco_set_delay_exposure(GET_PCO(cam), d, *exposure) != PCO_NOERROR)
-        return UCA_ERR_PROP_GENERAL;
+        return err | UCA_ERR_INVALID;
     return UCA_NO_ERROR;
 }
 
 static uint32_t uca_pco_set_delay(struct uca_camera *cam, uint32_t *delay)
 {
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_PROP;
     uint32_t e, d;
     if (pco_get_delay_exposure(GET_PCO(cam), &d, &e) != PCO_NOERROR)
-        return UCA_ERR_PROP_GENERAL;
+        return err | UCA_ERR_INVALID;
     if (pco_set_delay_exposure(GET_PCO(cam), *delay, e) != PCO_NOERROR)
-        return UCA_ERR_PROP_GENERAL;
+        return err | UCA_ERR_INVALID;
     return UCA_NO_ERROR;
 }
 
@@ -42,28 +44,29 @@ static uint32_t uca_pco_destroy(struct uca_camera *cam)
 static uint32_t uca_pco_set_property(struct uca_camera *cam, enum uca_property_ids property, void *data)
 {
     struct uca_grabber *grabber = cam->grabber;
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_PROP;
 
     switch (property) {
         case UCA_PROP_WIDTH:
             if (grabber->set_property(grabber, UCA_GRABBER_WIDTH, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             cam->frame_width = *((uint32_t *) data);
             break;
 
         case UCA_PROP_HEIGHT:
             if (grabber->set_property(grabber, UCA_GRABBER_HEIGHT, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             cam->frame_height = *((uint32_t *) data);
             break;
 
         case UCA_PROP_X_OFFSET:
             if (grabber->set_property(grabber, UCA_GRABBER_OFFSET_X, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_Y_OFFSET:
             if (grabber->set_property(grabber, UCA_GRABBER_OFFSET_Y, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_EXPOSURE:
@@ -77,11 +80,11 @@ static uint32_t uca_pco_set_property(struct uca_camera *cam, enum uca_property_i
 
         case UCA_PROP_GRAB_TIMEOUT:
             if (grabber->set_property(grabber, UCA_GRABBER_TIMEOUT, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return err | UCA_ERR_INVALID;
     }
     return UCA_NO_ERROR;
 }
@@ -148,20 +151,15 @@ static uint32_t uca_pco_get_property(struct uca_camera *cam, enum uca_property_i
             break;
 
         case UCA_PROP_X_OFFSET:
-            if (grabber->get_property(grabber, UCA_GRABBER_OFFSET_X, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_GENERAL;
-            break;
+            return grabber->get_property(grabber, UCA_GRABBER_OFFSET_X, (uint32_t *) data);
 
         case UCA_PROP_Y_OFFSET:
-            if (grabber->get_property(grabber, UCA_GRABBER_OFFSET_Y, (uint32_t *) data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_GENERAL;
-            break;
+            return grabber->get_property(grabber, UCA_GRABBER_OFFSET_Y, (uint32_t *) data);
 
         case UCA_PROP_DELAY:
             {
                 uint32_t exposure;
-                if (pco_get_delay_exposure(pco, (uint32_t *) data, &exposure) != PCO_NOERROR)
-                    return UCA_ERR_PROP_INVALID;
+                return pco_get_delay_exposure(pco, (uint32_t *) data, &exposure);
             }
             break;
 
@@ -176,8 +174,7 @@ static uint32_t uca_pco_get_property(struct uca_camera *cam, enum uca_property_i
         case UCA_PROP_EXPOSURE:
             {
                 uint32_t delay;
-                if (pco_get_delay_exposure(pco, &delay, (uint32_t *) data) != PCO_NOERROR)
-                    return UCA_ERR_PROP_INVALID;
+                return pco_get_delay_exposure(pco, &delay, (uint32_t *) data);
             }
             break;
 
@@ -196,31 +193,34 @@ static uint32_t uca_pco_get_property(struct uca_camera *cam, enum uca_property_i
         case UCA_PROP_GRAB_TIMEOUT:
             {
                 uint32_t timeout;
-                cam->grabber->get_property(cam->grabber, UCA_GRABBER_TIMEOUT, &timeout);
+                uint32_t err = cam->grabber->get_property(cam->grabber, UCA_GRABBER_TIMEOUT, &timeout);
+                if (err != UCA_NO_ERROR)
+                    return err;
                 set_void(data, uint32_t, timeout);
             }
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
     }
     return UCA_NO_ERROR;
 }
 
 uint32_t uca_pco_start_recording(struct uca_camera *cam)
 {
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_INIT;
     struct pco_edge *pco = GET_PCO(cam);
     if (pco_arm_camera(pco) != PCO_NOERROR)
-        return UCA_ERR_CAM_ARM;
+        return err | UCA_ERR_UNCLASSIFIED;
     if (pco_set_rec_state(pco, 1) != PCO_NOERROR)
-        return UCA_ERR_CAM_RECORD;
+        return err | UCA_ERR_UNCLASSIFIED;
     return cam->grabber->acquire(cam->grabber, -1);
 }
 
 uint32_t uca_pco_stop_recording(struct uca_camera *cam)
 {
     if (pco_set_rec_state(GET_PCO(cam), 0) != PCO_NOERROR)
-        return UCA_ERR_PROP_GENERAL;
+        return UCA_ERR_CAMERA | UCA_ERR_INIT | UCA_ERR_UNCLASSIFIED;
     return UCA_NO_ERROR;
 }
 
@@ -240,24 +240,24 @@ uint32_t uca_pco_register_callback(struct uca_camera *cam, uca_cam_grab_callback
     if (cam->callback == NULL) {
         cam->callback = callback;
         cam->callback_user = user;
-        cam->grabber->register_callback(cam->grabber, callback, NULL, user);
-        return UCA_NO_ERROR;
+        return cam->grabber->register_callback(cam->grabber, callback, NULL, user);
     }
-    return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
+    return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
 }
 
 uint32_t uca_pco_init(struct uca_camera **cam, struct uca_grabber *grabber)
 {
+    uint32_t err = UCA_ERR_CAMERA | UCA_ERR_INIT;
     if (grabber == NULL)
-        return UCA_ERR_CAM_NOT_FOUND;
+        return err | UCA_ERR_NOT_FOUND;
 
     struct pco_edge *pco = pco_init();
     if (pco == NULL)
-        return UCA_ERR_CAM_NOT_FOUND;
+        return err | UCA_ERR_NOT_FOUND;
 
     if ((pco->serial_ref == NULL) || !pco_is_active(pco)) {
         pco_destroy(pco);
-        return UCA_ERR_CAM_NOT_FOUND;
+        return err | UCA_ERR_NOT_FOUND;
     }
 
     struct uca_camera *uca = uca_cam_new();
diff --git a/src/cameras/pf.c b/src/cameras/pf.c
index 0bcf674..4688cd4 100644
--- a/src/cameras/pf.c
+++ b/src/cameras/pf.c
@@ -54,6 +54,7 @@ static uint32_t uca_pf_set_property(struct uca_camera *cam, enum uca_property_id
     struct uca_grabber *grabber = cam->grabber;
     TOKEN token = INVALID_TOKEN;
     int i = 0;
+    int err = UCA_ERR_CAMERA | UCA_ERR_PROP;
 
     /* Find a valid pf token for the property */
     while (uca_to_pf[i].uca_prop != -1) {
@@ -64,33 +65,33 @@ static uint32_t uca_pf_set_property(struct uca_camera *cam, enum uca_property_id
         i++;
     }
     if (token == INVALID_TOKEN)
-        return UCA_ERR_PROP_INVALID;
+        return err | UCA_ERR_INVALID;
 
     PFValue value;
 
     switch (property) {
         case UCA_PROP_WIDTH:
             if (grabber->set_property(grabber, UCA_GRABBER_WIDTH, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             if (uca_pf_set_uint32_property(token, data, &cam->frame_width) < 0)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_HEIGHT:
             if (grabber->set_property(grabber, UCA_GRABBER_HEIGHT, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             if (uca_pf_set_uint32_property(token, data, &cam->frame_height) < 0)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_X_OFFSET:
             if (grabber->set_property(grabber, UCA_GRABBER_OFFSET_X, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_Y_OFFSET:
             if (grabber->set_property(grabber, UCA_GRABBER_OFFSET_Y, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_EXPOSURE:
@@ -99,16 +100,16 @@ static uint32_t uca_pf_set_property(struct uca_camera *cam, enum uca_property_id
             value.type = PF_FLOAT;
             value.value.f = (float) *((uint32_t *) data) / 1000.0;
             if (pfDevice_SetProperty(0, token, &value) < 0)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         case UCA_PROP_GRAB_TIMEOUT:
             if (grabber->set_property(grabber, UCA_GRABBER_TIMEOUT, data) != UCA_NO_ERROR)
-                return UCA_ERR_PROP_VALUE_OUT_OF_RANGE;
+                return err | UCA_ERR_OUT_OF_RANGE;
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return err | UCA_ERR_INVALID;
     }
     return UCA_NO_ERROR;
 }
@@ -124,7 +125,7 @@ static uint32_t uca_pf_get_property(struct uca_camera *cam, enum uca_property_id
         if (uca_to_pf[i].uca_prop == property) {
             t = pfProperty_ParseName(0, uca_to_pf[i].pf_prop);
             if (t == INVALID_TOKEN || (pfDevice_GetProperty(0, t, &value) < 0))
-                return UCA_ERR_PROP_INVALID;
+                return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
 
             switch (value.type) {
                 case PF_INT:
@@ -171,7 +172,7 @@ static uint32_t uca_pf_get_property(struct uca_camera *cam, enum uca_property_id
             break;
 
         default:
-            return UCA_ERR_PROP_INVALID;
+            return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
     }
     return UCA_NO_ERROR;
 }
@@ -192,7 +193,7 @@ uint32_t uca_pf_grab(struct uca_camera *cam, char *buffer, void *metadata)
     uint32_t err = cam->grabber->grab(cam->grabber, (void **) &frame, &cam->current_frame);
     if (err != UCA_NO_ERROR)
         return err;
-    /* FIXME: choose according to data format */
+
     memcpy(buffer, frame, cam->frame_width*cam->frame_height);
     return UCA_NO_ERROR;
 }
@@ -202,10 +203,9 @@ uint32_t uca_pf_register_callback(struct uca_camera *cam, uca_cam_grab_callback
     if (cam->callback == NULL) {
         cam->callback = callback;
         cam->callback_user = user;
-        cam->grabber->register_callback(cam->grabber, callback, NULL, user);
-        return UCA_NO_ERROR;
+        return cam->grabber->register_callback(cam->grabber, callback, NULL, user);
     }
-    return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
+    return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
 }
 
 static uint32_t uca_pf_destroy(struct uca_camera *cam)
@@ -218,7 +218,7 @@ uint32_t uca_pf_init(struct uca_camera **cam, struct uca_grabber *grabber)
 {
     int num_ports;
     if ((grabber == NULL) || (pfPortInit(&num_ports) < 0) || (pfDeviceOpen(0) < 0))
-        return UCA_ERR_CAM_NOT_FOUND;
+        return UCA_ERR_CAMERA | UCA_ERR_INIT | UCA_ERR_NOT_FOUND;
 
     /* We could check if a higher baud rate is supported, but... forget about
      * it. We don't need high speed configuration. */
diff --git a/src/grabbers/me4.c b/src/grabbers/me4.c
index 6cd72ae..01b908d 100644
--- a/src/grabbers/me4.c
+++ b/src/grabbers/me4.c
@@ -72,9 +72,10 @@ static struct uca_sisofg_map_t *uca_me4_find_property(enum uca_grabber_constants
 
 uint32_t uca_me4_set_property(struct uca_grabber *grabber, enum uca_grabber_constants property, void *data)
 {
+    uint32_t err = UCA_ERR_GRABBER | UCA_ERR_PROP;
     struct uca_sisofg_map_t *fg_prop = uca_me4_find_property(property);
     if (fg_prop == NULL)
-        return UCA_ERR_PROP_INVALID;
+        return err | UCA_ERR_INVALID;
 
     switch (property) {
         case UCA_GRABBER_TIMEOUT:
@@ -91,21 +92,25 @@ uint32_t uca_me4_set_property(struct uca_grabber *grabber, enum uca_grabber_cons
          * the map. */
         struct uca_sisofg_map_t *constant = uca_me4_find_property(*((uint32_t *) data));
         if (constant != NULL)
-            return Fg_setParameter(GET_FG(grabber), fg_prop->fg_id, &constant->fg_id, PORT_A) == FG_OK ? UCA_NO_ERROR : UCA_ERR_PROP_INVALID;
-        return UCA_ERR_PROP_INVALID;
+            return Fg_setParameter(GET_FG(grabber), fg_prop->fg_id, &constant->fg_id, PORT_A) == FG_OK ? \
+                UCA_NO_ERROR : err | UCA_ERR_INVALID;
+        return err | UCA_ERR_INVALID;
     }
     else
-        return Fg_setParameter(GET_FG(grabber), fg_prop->fg_id, data, PORT_A) == FG_OK ? UCA_NO_ERROR : UCA_ERR_PROP_GENERAL;
+        return Fg_setParameter(GET_FG(grabber), fg_prop->fg_id, data, PORT_A) == FG_OK ? \
+            UCA_NO_ERROR : err | UCA_ERR_INVALID;
 }
 
 uint32_t uca_me4_get_property(struct uca_grabber *grabber, enum uca_grabber_constants property, void *data)
 {
+    uint32_t err = UCA_ERR_GRABBER | UCA_ERR_PROP;
     struct uca_sisofg_map_t *fg_prop = uca_me4_find_property(property);
     if (fg_prop == NULL)
-        return UCA_ERR_PROP_INVALID;
+        return err | UCA_ERR_INVALID;
 
     /* FIXME: translate data back to UCA_ normalized constants */
-    return Fg_getParameter(GET_FG(grabber), fg_prop->fg_id, data, PORT_A) == FG_OK ? UCA_NO_ERROR : UCA_ERR_PROP_GENERAL;
+    return Fg_getParameter(GET_FG(grabber), fg_prop->fg_id, data, PORT_A) == FG_OK ? \
+        UCA_NO_ERROR : err | UCA_ERR_INVALID;
 }
 
 uint32_t uca_me4_alloc(struct uca_grabber *grabber, uint32_t pixel_size, uint32_t n_buffers)
@@ -125,27 +130,27 @@ uint32_t uca_me4_alloc(struct uca_grabber *grabber, uint32_t pixel_size, uint32_
         ((struct fg_apc_data *) grabber->user)->mem = mem;
         return UCA_NO_ERROR;
     }
-    return UCA_ERR_PROP_GENERAL;
+    return UCA_ERR_GRABBER | UCA_ERR_NO_MEMORY;
 }
 
 uint32_t uca_me4_acquire(struct uca_grabber *grabber, int32_t n_frames)
 {
     if (GET_MEM(grabber) == NULL)
-        return UCA_ERR_GRABBER_NOMEM;
+        return UCA_ERR_GRABBER | UCA_ERR_NO_MEMORY;
 
     int flag = grabber->asynchronous ? ACQ_STANDARD : ACQ_BLOCK;
     n_frames = n_frames < 0 ? GRAB_INFINITE : n_frames;
     if (Fg_AcquireEx(GET_FG(grabber), 0, n_frames, flag, GET_MEM(grabber)) == FG_OK)
         return UCA_NO_ERROR;
 
-    return UCA_ERR_GRABBER_ACQUIRE;
+    return UCA_ERR_GRABBER | UCA_ERR_ACQUIRE;
 }
 
 uint32_t uca_me4_stop_acquire(struct uca_grabber *grabber)
 {
     if (GET_MEM(grabber) != NULL)
         if (Fg_stopAcquireEx(GET_FG(grabber), 0, GET_MEM(grabber), STOP_SYNC) != FG_OK)
-            return UCA_ERR_PROP_GENERAL;
+            return UCA_ERR_GRABBER | UCA_ERR_ACQUIRE;
     return UCA_NO_ERROR;
 }
 
@@ -160,7 +165,7 @@ uint32_t uca_me4_grab(struct uca_grabber *grabber, void **buffer, uint64_t *fram
         last_frame = Fg_getLastPicNumberBlockingEx(me4->fg, last_frame+1, PORT_A, me4->timeout, me4->mem);
 
     if (last_frame <= 0)
-        return UCA_ERR_PROP_GENERAL;
+        return UCA_ERR_GRABBER | UCA_ERR_FRAME_TRANSFER;
 
     *frame_number = (uint64_t) last_frame;
     *buffer = Fg_getImagePtrEx(me4->fg, last_frame, PORT_A, me4->mem);
@@ -191,10 +196,10 @@ uint32_t uca_me4_register_callback(struct uca_grabber *grabber, uca_cam_grab_cal
         ctrl.timeout = 1;
 
         if (Fg_registerApcHandler(GET_FG(grabber), PORT_A, &ctrl, FG_APC_CONTROL_BASIC) != FG_OK)
-            return UCA_ERR_GRABBER_CALLBACK_REGISTRATION_FAILED;
+            return UCA_ERR_GRABBER | UCA_ERR_CALLBACK;
     }
     else
-        return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
+        return UCA_ERR_GRABBER | UCA_ERR_CALLBACK;
 
     return UCA_NO_ERROR;
 }
@@ -203,7 +208,7 @@ uint32_t uca_me4_init(struct uca_grabber **grabber)
 {
     Fg_Struct *fg = Fg_Init("libFullAreaGray8.so", 0);
     if (fg == NULL)
-        return UCA_ERR_GRABBER_NOT_FOUND;
+        return UCA_ERR_GRABBER | UCA_ERR_NOT_FOUND;
 
     struct uca_grabber *uca = (struct uca_grabber *) malloc(sizeof(struct uca_grabber));
     memset(uca, 0, sizeof(struct uca_grabber));
diff --git a/src/uca.c b/src/uca.c
index 5b0ad85..aa41417 100644
--- a/src/uca.c
+++ b/src/uca.c
@@ -138,7 +138,7 @@ struct uca *uca_init(const char *config_filename)
     while (grabber_inits[i] != NULL) {
         uca_grabber_init init = grabber_inits[i];
         /* FIXME: we don't only want to take the first one */
-        if (init(&grabber) != UCA_ERR_GRABBER_NOT_FOUND)
+        if (init(&grabber) == UCA_NO_ERROR)
             break;
         i++;
     }
@@ -159,7 +159,7 @@ struct uca *uca_init(const char *config_filename)
     while (cam_inits[i] != NULL) {
         struct uca_camera *cam = NULL;
         uca_cam_init init = cam_inits[i];
-        if (init(&cam, grabber) != UCA_ERR_CAM_NOT_FOUND) {
+        if (init(&cam, grabber) == UCA_NO_ERROR) {
             if (current == NULL) 
                 g_uca->cameras = current = cam;
             else {
@@ -214,7 +214,7 @@ enum uca_property_ids uca_get_property_id(const char *property_name)
             return i;
         i++;
     }
-    return UCA_ERR_PROP_INVALID;
+    return UCA_ERR_CAMERA | UCA_ERR_PROP | UCA_ERR_INVALID;
 }
 
 struct uca_property *uca_get_full_property(enum uca_property_ids property_id)
diff --git a/src/uca.h b/src/uca.h
index 1664fb3..08aebfd 100644
--- a/src/uca.h
+++ b/src/uca.h
@@ -199,23 +199,42 @@ typedef struct uca_property {
 
 extern const char *uca_unit_map[];      /**< maps unit numbers to corresponding strings */
 
-enum uca_errors {
-    UCA_NO_ERROR = 0,
-    UCA_ERR_GRABBER_NOT_FOUND,
-    UCA_ERR_CAM_NOT_FOUND,              /**< camera probing or initialization failed */
-    UCA_ERR_PROP_INVALID,               /**< the requested property is not supported by the camera */
-    UCA_ERR_PROP_GENERAL,               /**< error occured reading/writing the property */
-    UCA_ERR_PROP_VALUE_OUT_OF_RANGE,    /**< error occured writing the property */
-    UCA_ERR_PROP_CAMERA_RECORDING,      /**< cannot set/get property because camera is recording */
-
-    UCA_ERR_CAM_ARM,                    /**< camera is not armed */
-    UCA_ERR_CAM_RECORD,                 /**< could not record */
-
-    UCA_ERR_GRABBER_ACQUIRE,            /**< grabber couldn't acquire a frame */
-    UCA_ERR_GRABBER_NOMEM,               /**< no memory was allocated using uca_grabber->alloc() */
-    UCA_ERR_GRABBER_CALLBACK_REGISTRATION_FAILED,
-    UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED
-};
+
+/*
+ * 16 bits error code
+ * 4 bits error source
+ * 4 bits error class
+ * 4 bits reserved
+ * 4 bits error level
+ */
+
+#define UCA_NO_ERROR            0x00000000
+
+#define UCA_ERR_MASK_CODE       0x0000FFFF
+#define UCA_ERR_MASK_SOURCE     0x000F0000
+#define UCA_ERR_MASK_TYPE       0x00F00000
+#define UCA_ERR_MASK_RESRV      0x0F000000
+#define UCA_ERR_MASK_LEVEL      0xF0000000
+
+#define UCA_ERR_GRABBER         0x00010000
+#define UCA_ERR_CAMERA          0x00020000
+
+#define UCA_ERR_INIT            0x00100000  /**< error during initialization */
+#define UCA_ERR_PROP            0x00200000  /**< error while setting/getting property */
+#define UCA_ERR_CALLBACK        0x00300000  /**< callback-related errors */
+
+#define UCA_ERR_FAILURE         0x10000000
+#define UCA_ERR_WARNING         0x20000000
+
+#define UCA_ERR_UNCLASSIFIED    0x10000001
+#define UCA_ERR_NOT_FOUND       0x10000002
+#define UCA_ERR_INVALID         0x10000003
+#define UCA_ERR_NO_MEMORY       0x10000004
+#define UCA_ERR_OUT_OF_RANGE    0x10000005
+#define UCA_ERR_ACQUIRE         0x10000006
+#define UCA_ERR_IS_RECORDING    0x10000007 /**< error because device is recording */
+#define UCA_ERR_FRAME_TRANSFER  0x10000008
+#define UCA_ERR_ALREADY_REGISTERED 0x10000009
 
 /**
  * Keeps a list of cameras and grabbers.