确保线程安全

player/AudioSRC.cpp

@@ -113,6 +113,7 @@ int AudioPlayer::getPCMChannel() {
 }
 
 int AudioPlayer::getPCMData(char *buf, int size) {
+    lock_guard<mutex> lck(_mtx);
     if (_buffer.size() < size) {
         return 0;
     }
@@ -122,5 +123,6 @@ int AudioPlayer::getPCMData(char *buf, int size) {
 }
 
 void AudioPlayer::inputFrame(const char *data, size_t size) {
+    lock_guard<mutex> lck(_mtx);
     _buffer.append(data, size);
 }

player/AudioSRC.h

@@ -79,6 +79,7 @@ private:
 private:
     int _sample_rate, _channel;
     SDL_AudioFormat _format;
+    mutex _mtx;
     BufferLikeString _buffer;
     SDLAudioDevice::Ptr _device;
 };