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

api/include/mk_media.h

@@ -59,6 +59,12 @@ API_EXPORT void API_CALL mk_media_init_video(mk_media ctx, int codec_id, int wid
  */
 API_EXPORT void API_CALL mk_media_init_audio(mk_media ctx, int codec_id, int sample_rate, int channels, int sample_bit);
 
+/**
+ * 添加静音音频轨道
+ * @param ctx 对象指针
+ */
+API_EXPORT void API_CALL mk_media_init_mute_audio(mk_media ctx);
+
 /**
  * 初始化h264/h265/aac完毕后调用此函数，
  * 在单track(只有音频或视频)时，因为ZLMediaKit不知道后续是否还要添加track，所以会多等待3秒钟

api/source/mk_media.cpp

@@ -196,6 +196,12 @@ API_EXPORT void API_CALL mk_media_init_audio(mk_media ctx, int codec_id, int sam
     (*obj)->getChannel()->initAudio(info);
 }
 
+API_EXPORT void API_CALL mk_media_init_mute_audio(mk_media ctx) {
+    assert(ctx);
+    MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;
+    (*obj)->getChannel()->addMuteAudioTrack();
+}
+
 API_EXPORT void API_CALL mk_media_init_complete(mk_media ctx){
     assert(ctx);
     MediaHelper::Ptr *obj = (MediaHelper::Ptr *) ctx;

api/source/mk_player.cpp

@@ -77,10 +77,11 @@ public:
         //播放成功,添加事件回调
         weak_ptr<MediaPlayerForC> weak_self = shared_from_this();
         auto delegate = std::make_shared<FrameWriterInterfaceHelper>([weak_self](const Frame::Ptr &frame) {
-            auto strong_self = weak_self.lock();
-            if (strong_self) {
+            if (auto strong_self = weak_self.lock()) {
                 strong_self->onData(frame);
+                return true;
             }
+            return false;
         });
         for (auto &track : _player->getTracks(false)) {
             track->addDelegate(delegate);