diff options
Diffstat (limited to 'src/uca-camera.c')
| -rw-r--r-- | src/uca-camera.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/uca-camera.c b/src/uca-camera.c index cc0c1cf..98d4373 100644 --- a/src/uca-camera.c +++ b/src/uca-camera.c @@ -360,6 +360,7 @@ uca_camera_class_init (UcaCameraClass *klass) klass->start_recording = NULL; klass->stop_recording = NULL; klass->grab = NULL; + klass->readout = NULL; klass->write = NULL; camera_properties[PROP_NAME] = @@ -1066,6 +1067,78 @@ uca_camera_grab (UcaCamera *camera, gpointer data, GError **error) return result; } +/** + * uca_camera_readout: + * @camera: A #UcaCamera object + * @data: (type gulong): Pointer to suitably sized data buffer. Must not be + * %NULL. + * @index: Index of in-camera frame to be grabbed + * @error: Location to store a #UcaCameraError error or %NULL + * + * Grab a frame a single frame and store the result in @data. + * + * You must have called uca_camera_start_recording() before, otherwise you will + * get a #UCA_CAMERA_ERROR_NOT_RECORDING error. + * + * Since: 2.1 + */ +gboolean +uca_camera_readout (UcaCamera *camera, gpointer data, guint index, GError **error) +{ + UcaCameraClass *klass; + gboolean result = FALSE; + + /* FIXME: this prevents accessing two independent cameras simultanously. */ + static GStaticMutex mutex = G_STATIC_MUTEX_INIT; + + g_return_val_if_fail (UCA_IS_CAMERA(camera), FALSE); + + klass = UCA_CAMERA_GET_CLASS (camera); + + g_return_val_if_fail (klass != NULL, FALSE); + g_return_val_if_fail (klass->readout != NULL, FALSE); + g_return_val_if_fail (data != NULL, FALSE); + + if (camera->priv->buffered) { + g_set_error (error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_RECORDING, + "Cannot grab specific frame in buffered mode"); + return FALSE; + } + + g_static_mutex_lock (&mutex); + + if (!camera->priv->is_recording && !camera->priv->is_readout) { + g_set_error (error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_NOT_RECORDING, + "Camera is not in readout or record mode"); + } + else { + g_static_mutex_lock (&access_lock); + +#ifdef WITH_PYTHON_MULTITHREADING + if (Py_IsInitialized ()) { + PyGILState_STATE state = PyGILState_Ensure (); + Py_BEGIN_ALLOW_THREADS + + result = (*klass->readout) (camera, data, index, error); + + Py_END_ALLOW_THREADS + PyGILState_Release (state); + } + else { + result = (*klass->readout) (camera, data, index, error); + } +#else + result = (*klass->readout) (camera, data, index, error); +#endif + + g_static_mutex_unlock (&access_lock); + } + + g_static_mutex_unlock (&mutex); + + return result; +} + static GParamSpec * get_param_spec_by_name (UcaCamera *camera, const gchar *prop_name) |