ringbuffer: add write lock

Change-Id: Idde24be13daf0fca55ce5a2607e6b9835c18f3c5

src/media/audio/ringbuffer.cpp

@@ -163,6 +163,7 @@ RingBuffer::hasNoReadOffsets() const
 void
 RingBuffer::put(std::shared_ptr<AudioFrame>&& data)
 {
+    std::lock_guard<std::mutex> l(writeLock_);
     resizer_.enqueue(resampler_.resample(std::move(data), format_));
 }
 

src/media/audio/ringbuffer.h

@@ -72,6 +72,7 @@ public:
 
     inline void setFormat(const AudioFormat& format)
     {
+        std::lock_guard<std::mutex> l(writeLock_);
         format_ = format;
         resizer_.setFormat(format, format.sample_rate / 50);
     }
@@ -201,6 +202,7 @@ private:
 
     mutable std::mutex lock_;
     mutable std::condition_variable not_empty_;
+    std::mutex writeLock_;
 
     ReadOffsetMap readoffsets_;