libavfilter: Unify Execution Modes in DNN Filters

This commit unifies the async and sync mode from the DNN filters'
perspective. As of this commit, the Native backend only supports
synchronous execution mode.

Now the user can switch between async and sync mode by using the
'async' option in the backend_configs. The values can be 1 for
async and 0 for sync mode of execution.

This commit affects the following filters:
1. vf_dnn_classify
2. vf_dnn_detect
3. vf_dnn_processing
4. vf_sr
5. vf_derain

This commit also updates the filters vf_dnn_detect and vf_dnn_classify
to send only the input frame and send NULL as output frame instead of
input frame to the DNN backends.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/libavfilter/dnn/dnn_backend_common.c b/libavfilter/dnn/dnn_backend_common.c
index 426683b73d..6a9c4cc87f 100644
--- a/libavfilter/dnn/dnn_backend_common.c
+++ b/libavfilter/dnn/dnn_backend_common.c
@@ -38,7 +38,7 @@ int ff_check_exec_params(void *ctx, DNNBackendType backend, DNNFunctionType func
         return AVERROR(EINVAL);
     }
 
-    if (!exec_params->out_frame) {
+    if (!exec_params->out_frame && func_type == DFT_PROCESS_FRAME) {
         av_log(ctx, AV_LOG_ERROR, "out frame is NULL when execute model.\n");
         return AVERROR(EINVAL);
     }
@@ -138,7 +138,7 @@ DNNReturnType ff_dnn_start_inference_async(void *ctx, DNNAsyncExecModule *async_
     return DNN_SUCCESS;
 }
 
-DNNAsyncStatusType ff_dnn_get_async_result_common(Queue *task_queue, AVFrame **in, AVFrame **out)
+DNNAsyncStatusType ff_dnn_get_result_common(Queue *task_queue, AVFrame **in, AVFrame **out)
 {
     TaskItem *task = ff_queue_peek_front(task_queue);