A2DPStream provide access to buffer

Author: pschatzmann

src/AudioLibs/A2DPStream.h

@@ -258,27 +258,34 @@ class A2DPStream : public AudioStream, public VolumeSupport {
             return result;
         }
 
+        /// Provides the number of bytes available to read
         int available() override {
             // only supported in tx mode
             if (config.mode!=RX_MODE) return 0;
             return a2dp_buffer.available();
         }
 
+        /// Provides the number of bytes available to write
         int availableForWrite() override {
             // only supported in tx mode
             if (config.mode!=TX_MODE ) return 0;
             // return infor from buffer
             return a2dp_buffer.availableForWrite();
         }
 
-        // Define the volme (values between 0.0 and 1.0)
+        /// Define the volume (values between 0.0 and 1.0)
         bool setVolume(float volume) override {
             VolumeSupport::setVolume(volume);
             // 128 is max volume
             if (a2dp!=nullptr) a2dp->set_volume(volume * A2DP_MAX_VOL);
             return true;
         }
 
+        /// Provides access to the buffer
+        BaseBuffer<uint8_t> &buffer() {
+            return a2dp_buffer;
+        }
+
     protected:
         A2DPConfig config;
         BluetoothA2DPSource *a2dp_source = nullptr;

src/AudioTools/Buffers.h

@@ -144,6 +144,13 @@ class BaseBuffer {
 
   virtual size_t size() = 0;
 
+  /// Returns the level of the buffer in %
+  virtual float levelPercent() {
+    // prevent div by 0.
+    if (size()==0) return 0.0;
+    return 100.0 * static_cast<float>(available()) / static_cast<float>(size());
+  }
+
  protected:
   void setWritePos(int pos){};