[FFmpeg-devel] [PATCH] lavfi/dnn: Fix OpenVINO missing model file corrupt issue.

[Ting Fu]

DNN OpenVINO backend would not report missing model file if it does not
exist. It would corrupt directly with out any error infomation. This commit
would check both .xml and .bin file existance before loading model.

Signed-off-by: Ting Fu <ting.fu at intel.com>
---
 libavfilter/dnn/dnn_backend_openvino.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/libavfilter/dnn/dnn_backend_openvino.c b/libavfilter/dnn/dnn_backend_openvino.c
index b494f26f55..47e3fc8280 100644
--- a/libavfilter/dnn/dnn_backend_openvino.c
+++ b/libavfilter/dnn/dnn_backend_openvino.c
@@ -34,6 +34,7 @@
 #include "../internal.h"
 #include "safe_queue.h"
 #include <c_api/ie_c_api.h>
+#include <unistd.h>
 #include "dnn_backend_common.h"
 
 typedef struct OVOptions{
@@ -728,7 +729,7 @@ DNNModel *ff_dnn_load_model_ov(const char *model_filename, DNNFunctionType func_
     OVContext *ctx = NULL;
     IEStatusCode status;
     size_t node_count = 0;
-    char *node_name = NULL;
+    char *node_name, *model_binary_file, *extension_chr = NULL;
 
     model = av_mallocz(sizeof(DNNModel));
     if (!model){
@@ -758,6 +759,22 @@ DNNModel *ff_dnn_load_model_ov(const char *model_filename, DNNFunctionType func_
     if (status != OK)
         goto err;
 
+    //file existance check
+    model_binary_file = (char *)malloc(sizeof(model_filename));
+    strcpy(model_binary_file, model_filename);
+    extension_chr = strstr(model_binary_file, ".xml");
+    if (!extension_chr) {
+        av_log(ctx, AV_LOG_ERROR, "Model file name \"%s\" with incorrect extension.",
+               model_filename);
+        goto err;
+    }
+    strcpy(extension_chr, ".bin");
+    if (access(model_filename, F_OK) || access(model_binary_file, F_OK)) {
+        av_log(ctx, AV_LOG_ERROR, "Model file \"%s\" or \"%s\" does not exist.",
+               model_filename, model_binary_file);
+        goto err;
+    }
+
     status = ie_core_read_network(ov_model->core, model_filename, NULL, &ov_model->network);
     if (status != OK) {
         ie_version_t ver;
@@ -806,6 +823,7 @@ DNNModel *ff_dnn_load_model_ov(const char *model_filename, DNNFunctionType func_
     return model;
 
 err:
+    free(model_binary_file);
     ff_dnn_free_model_ov(&model);
     return NULL;
 }
-- 
2.17.1