addTrack/inputFrame接口支持返回值；新增全局添加静音音频接口

player/test_player.cpp

@@ -84,7 +84,7 @@ int main(int argc, char *argv[]) {
                 });
             });
             auto delegate = std::make_shared<FrameWriterInterfaceHelper>([decoder](const Frame::Ptr &frame) {
-                decoder->inputFrame(frame);
+                return decoder->inputFrame(frame);
             });
             videoTrack->addDelegate(delegate);
         }
@@ -106,7 +106,7 @@ int main(int argc, char *argv[]) {
                 audio_player->playPCM((const char *) (pcm->get()->data[0]), len);
             });
             auto audio_delegate = std::make_shared<FrameWriterInterfaceHelper>( [decoder](const Frame::Ptr &frame) {
-                decoder->inputFrame(frame);
+                return decoder->inputFrame(frame);
             });
             audioTrack->addDelegate(audio_delegate);
         }