Complete async xfer infrastructure

3 files changed, 97 insertions, 5 deletions

diff --git a/src/cameras/uca-mock-camera.c b/src/cameras/uca-mock-camera.c
index 8dacf5d..b1c325e 100644
--- a/src/cameras/uca-mock-camera.c
+++ b/src/cameras/uca-mock-camera.c
@@ -59,23 +59,84 @@ struct _UcaMockCameraPrivate {
     guint framerate;
     guint16 *dummy_data;
 
+    gboolean thread_running;
+
+    GThread *grab_thread;
     GValueArray *binnings;
 };
 
+/**
+ * uca_mock_camera_new:
+ * @error: Location for error
+ *
+ * Create a new #UcaMockCamera object.
+ *
+ * Returns: A newly created #UcaMockCamera object
+ */
 UcaMockCamera *uca_mock_camera_new(GError **error)
 {
     UcaMockCamera *camera = g_object_new(UCA_TYPE_MOCK_CAMERA, NULL);
     return camera;
 }
 
+static gpointer mock_grab_func(gpointer data)
+{
+    UcaMockCamera *mock_camera = UCA_MOCK_CAMERA(data);
+    g_return_val_if_fail(UCA_IS_MOCK_CAMERA(mock_camera), NULL);
+
+    UcaMockCameraPrivate *priv = UCA_MOCK_CAMERA_GET_PRIVATE(mock_camera);
+    UcaCamera *camera = UCA_CAMERA(mock_camera);
+    const gulong sleep_time = G_USEC_PER_SEC / priv->framerate;
+
+    while (priv->thread_running) {
+        camera->grab_func(NULL, camera->user_data);
+        g_usleep(sleep_time);
+    }
+
+    return NULL;
+}
+
 static void uca_mock_camera_start_recording(UcaCamera *camera, GError **error)
 {
     g_return_if_fail(UCA_IS_MOCK_CAMERA(camera));
+
+    /*
+     * In case asynchronous transfer is requested, we start a new thread that
+     * invokes the grab callback, otherwise nothing will be done here.
+     */
+
+    UcaMockCameraPrivate *priv = UCA_MOCK_CAMERA_GET_PRIVATE(camera);
+    gboolean transfer_async = FALSE;
+    g_object_get(G_OBJECT(camera),
+            "transfer-asynchronously", &transfer_async,
+            NULL);
+
+    if (transfer_async) {
+        GError *tmp_error = NULL;
+        priv->thread_running = TRUE;
+        priv->grab_thread = g_thread_create(mock_grab_func, camera, TRUE, &tmp_error); 
+
+        if (tmp_error != NULL) {
+            priv->thread_running = FALSE;
+            g_propagate_error(error, tmp_error);
+        }
+    }
 }
 
 static void uca_mock_camera_stop_recording(UcaCamera *camera, GError **error)
 {
     g_return_if_fail(UCA_IS_MOCK_CAMERA(camera));
+
+    UcaMockCameraPrivate *priv = UCA_MOCK_CAMERA_GET_PRIVATE(camera);
+    gboolean transfer_async = FALSE;
+    g_object_get(G_OBJECT(camera),
+            "transfer-asynchronously", &transfer_async,
+            NULL);
+
+    if (transfer_async) {
+        priv->thread_running = FALSE;    
+        g_thread_join(priv->grab_thread);
+    }
 }
 
 static void uca_mock_camera_grab(UcaCamera *camera, gpointer data, GError **error)
@@ -145,6 +206,11 @@ static void uca_mock_camera_finalize(GObject *object)
 {
     UcaMockCameraPrivate *priv = UCA_MOCK_CAMERA_GET_PRIVATE(object);
 
+    if (priv->thread_running) {
+        priv->thread_running = FALSE;    
+        g_thread_join(priv->grab_thread);
+    }
+
     g_free(priv->dummy_data);
     g_value_array_free(priv->binnings);
 
@@ -185,6 +251,7 @@ static void uca_mock_camera_init(UcaMockCamera *self)
     self->priv->width = 640;
     self->priv->height = 480;
     self->priv->dummy_data = (guint16 *) g_malloc0(self->priv->width * self->priv->height);
+    self->priv->grab_thread = NULL;
 
     self->priv->binnings = g_value_array_new(1);
     GValue val = {0};
diff --git a/src/uca-camera.c b/src/uca-camera.c
index 88b6ddd..ac04b86 100644
--- a/src/uca-camera.c
+++ b/src/uca-camera.c
@@ -64,7 +64,16 @@ static GParamSpec *camera_properties[N_PROPERTIES] = { NULL, };
 
 static void uca_camera_set_property(GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
 {
-    G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
+    UcaCameraPrivate *priv = UCA_CAMERA_GET_PRIVATE(object);
+
+    switch (property_id) {
+        case PROP_TRANSFER_ASYNCHRONOUSLY:
+            priv->transfer_async = g_value_get_boolean(value);
+            break;
+
+        default:
+            G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
+    }
 }
 
 static void uca_camera_get_property(GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
@@ -76,6 +85,10 @@ static void uca_camera_get_property(GObject *object, guint property_id, GValue *
             g_value_set_boolean(value, priv->is_recording);
             break;
 
+        case PROP_TRANSFER_ASYNCHRONOUSLY:
+            g_value_set_boolean(value, priv->transfer_async);
+            break;
+
         default:
             G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
     }
@@ -180,6 +193,8 @@ static void uca_camera_class_init(UcaCameraClass *klass)
 
 static void uca_camera_init(UcaCamera *camera)
 {
+    camera->grab_func = NULL;
+
     camera->priv = UCA_CAMERA_GET_PRIVATE(camera);
     camera->priv->is_recording = FALSE;
     camera->priv->transfer_async = FALSE;
@@ -230,6 +245,12 @@ void uca_camera_start_recording(UcaCamera *camera, GError **error)
         return;
     }
 
+    if (camera->priv->transfer_async && (camera->grab_func == NULL)) {
+        g_set_error(error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_NO_GRAB_FUNC,
+                "No grab callback function set");
+        return;
+    }
+
     GError *tmp_error = NULL;
     (*klass->start_recording)(camera, &tmp_error);
 
@@ -280,9 +301,10 @@ void uca_camera_stop_recording(UcaCamera *camera, GError **error)
  *
  * Set the grab function that is called whenever a frame is readily transfered.
  */
-void uca_camera_set_grab_func(UcaCamera *camera, UcaCameraGrabFunc func)
+void uca_camera_set_grab_func(UcaCamera *camera, UcaCameraGrabFunc func, gpointer user_data)
 {
-    /* TODO: implement */
+    camera->grab_func = func;
+    camera->user_data = user_data;
 }
 
 void uca_camera_grab(UcaCamera *camera, gpointer data, GError **error)
diff --git a/src/uca-camera.h b/src/uca-camera.h
index dc5901a..0370466 100644
--- a/src/uca-camera.h
+++ b/src/uca-camera.h
@@ -30,7 +30,8 @@
 #define UCA_CAMERA_ERROR uca_camera_error_quark()
 typedef enum {
     UCA_CAMERA_ERROR_RECORDING,
-    UCA_CAMERA_ERROR_NOT_RECORDING
+    UCA_CAMERA_ERROR_NOT_RECORDING,
+    UCA_CAMERA_ERROR_NO_GRAB_FUNC
 } UcaCameraError;
 
 typedef struct _UcaCamera           UcaCamera;
@@ -51,6 +52,8 @@ struct _UcaCamera {
     GObject parent;
 
     UcaCameraGrabFunc grab_func;
+    gpointer user_data;
+
     UcaCameraPrivate *priv;
 };
 
@@ -74,7 +77,7 @@ struct _UcaCameraClass {
 void uca_camera_start_recording(UcaCamera *camera, GError **error);
 void uca_camera_stop_recording(UcaCamera *camera, GError **error);
 void uca_camera_grab(UcaCamera *camera, gpointer data, GError **error);
-void uca_camera_set_grab_func(UcaCamera *camera, UcaCameraGrabFunc func);
+void uca_camera_set_grab_func(UcaCamera *camera, UcaCameraGrabFunc func, gpointer user_data);
 
 GType uca_camera_get_type(void);