Add opus codec test

tests/opus/OpusDecoderImpl.h

@@ -0,0 +1,28 @@
+
+#ifndef __OPUSDECODERIMPL_H
+#define __OPUSDECODERIMPL_H
+#include <stdio.h>
+
+#include <mutex>
+#include <queue>
+#include <thread>
+#include <vector>
+
+#include "base_type.h"
+#include "opus/opus.h"
+
+class OpusDecoderImpl {
+ private:
+  /* data */
+  OpusDecoder *decoder;
+  int sample_rate;
+  int channel_num;
+  FILE *pcm_file;
+
+ public:
+  bool Decode(unsigned char *in_data, int len);
+  OpusDecoderImpl(int sampleRate, int channel);
+  ~OpusDecoderImpl();
+};
+
+#endif