lavfi/dnn: Common Function to Get Async Result in DNN Backends

This commits refactors the get async result function for common
use in all three backends.

Signed-off-by: Shubhanshu Saxena <shubhanshu.e01@gmail.com>

libavfilter/dnn/dnn_backend_common.c

@@ -122,3 +122,23 @@ DNNReturnType ff_dnn_start_inference_async(void *ctx, DNNAsyncExecModule *async_
 #endif
     return DNN_SUCCESS;
 }
+
+DNNAsyncStatusType ff_dnn_get_async_result_common(Queue *task_queue, AVFrame **in, AVFrame **out)
+{
+    TaskItem *task = ff_queue_peek_front(task_queue);
+
+    if (!task) {
+        return DAST_EMPTY_QUEUE;
+    }
+
+    if (task->inference_done != task->inference_todo) {
+        return DAST_NOT_READY;
+    }
+
+    *in = task->in_frame;
+    *out = task->out_frame;
+    ff_queue_pop_front(task_queue);
+    av_freep(&task);
+
+    return DAST_SUCCESS;
+}

libavfilter/dnn/dnn_backend_common.h

@@ -24,6 +24,7 @@
 #ifndef AVFILTER_DNN_DNN_BACKEND_COMMON_H
 #define AVFILTER_DNN_DNN_BACKEND_COMMON_H
 
+#include "queue.h"
 #include "../dnn_interface.h"
 #include "libavutil/thread.h"
 
@@ -122,4 +123,18 @@ DNNReturnType ff_dnn_async_module_cleanup(DNNAsyncExecModule *async_module);
  */
 DNNReturnType ff_dnn_start_inference_async(void *ctx, DNNAsyncExecModule *async_module);
 
+/**
+ * Extract input and output frame from the Task Queue after
+ * asynchronous inference.
+ *
+ * @param task_queue pointer to the task queue of the backend
+ * @param in double pointer to the input frame
+ * @param out double pointer to the output frame
+ *
+ * @retval DAST_EMPTY_QUEUE if task queue is empty
+ * @retval DAST_NOT_READY if inference not completed yet.
+ * @retval DAST_SUCCESS if result successfully extracted
+ */
+DNNAsyncStatusType ff_dnn_get_async_result_common(Queue *task_queue, AVFrame **in, AVFrame **out);
+
 #endif

libavfilter/dnn/dnn_backend_openvino.c

@@ -32,7 +32,6 @@
 #include "libavutil/avstring.h"
 #include "libavutil/detection_bbox.h"
 #include "../internal.h"
-#include "queue.h"
 #include "safe_queue.h"
 #include <c_api/ie_c_api.h>
 #include "dnn_backend_common.h"
@@ -883,22 +882,7 @@ DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, DNNExecBasePa
 DNNAsyncStatusType ff_dnn_get_async_result_ov(const DNNModel *model, AVFrame **in, AVFrame **out)
 {
     OVModel *ov_model = model->model;
-    TaskItem *task = ff_queue_peek_front(ov_model->task_queue);
-
-    if (!task) {
-        return DAST_EMPTY_QUEUE;
-    }
-
-    if (task->inference_done != task->inference_todo) {
-        return DAST_NOT_READY;
-    }
-
-    *in = task->in_frame;
-    *out = task->out_frame;
-    ff_queue_pop_front(ov_model->task_queue);
-    av_freep(&task);
-
-    return DAST_SUCCESS;
+    return ff_dnn_get_async_result_common(ov_model->task_queue, in, out);
 }
 
 DNNReturnType ff_dnn_flush_ov(const DNNModel *model)

libavfilter/dnn/queue.h

@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 
 #ifndef AVFILTER_DNN_QUEUE_H
 #define AVFILTER_DNN_QUEUE_H