[FFmpeg-cvslog] lavfi/dnn: Common Function to Get Async Result in DNN Backends

[Shubhanshu Saxena]

ffmpeg | branch: master | Shubhanshu Saxena <shubhanshu.e01 at gmail.com> | Sun Aug  8 16:43:32 2021 +0530| [c71657858833008d2c17990ee78d2ec792996a1a] | committer: Guo Yejun

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 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c71657858833008d2c17990ee78d2ec792996a1a
---

 libavfilter/dnn/dnn_backend_common.c   | 20 ++++++++++++++++++++
 libavfilter/dnn/dnn_backend_common.h   | 15 +++++++++++++++
 libavfilter/dnn/dnn_backend_openvino.c | 18 +-----------------
 libavfilter/dnn/queue.h                |  1 +
 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/libavfilter/dnn/dnn_backend_common.c b/libavfilter/dnn/dnn_backend_common.c
index 4c9045501f..df4bab85e0 100644
--- a/libavfilter/dnn/dnn_backend_common.c
+++ b/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;
+}
diff --git a/libavfilter/dnn/dnn_backend_common.h b/libavfilter/dnn/dnn_backend_common.h
index 96e4df9676..e1d678b230 100644
--- a/libavfilter/dnn/dnn_backend_common.h
+++ b/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
diff --git a/libavfilter/dnn/dnn_backend_openvino.c b/libavfilter/dnn/dnn_backend_openvino.c
index 8d23446296..47cbd48ba2 100644
--- a/libavfilter/dnn/dnn_backend_openvino.c
+++ b/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)
diff --git a/libavfilter/dnn/queue.h b/libavfilter/dnn/queue.h
index 2524d5fa59..9ab5c89f65 100644
--- a/libavfilter/dnn/queue.h
+++ b/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