add notify_all functions

src/zm_packet.h

@@ -79,6 +79,9 @@ class ZMPacket {
     //AVFrame *get_out_frame(const AVCodecContext *ctx);
     AVFrame *get_out_frame(int width, int height, AVPixelFormat format);
     int get_codec_imgsize() { return codec_imgsize; };
+    void notify_all() {
+      this->condition_.notify_all();
+    }
 };
 
 class ZMLockedPacket {
@@ -120,6 +123,10 @@ class ZMLockedPacket {
       Debug(4, "packet %d waiting", packet_->image_index);
       packet_->condition_.wait(lck_);
     }
+    void notify_all() {
+      packet_->notify_all();
+    }
+    
 };
 
 #endif /* ZM_PACKET_H */