Adding AudioDeviceDataObserver interface

webrtc/modules/audio_device/include/audio_device_data_observer.h

Index: webrtc/modules/audio_device/include/audio_device_data_observer.h
diff --git a/webrtc/modules/audio_device/include/audio_device_data_observer.h b/webrtc/modules/audio_device/include/audio_device_data_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..f1a3d684da544cd6b185441f9e85aa8f00c4554e
--- /dev/null
+++ b/webrtc/modules/audio_device/include/audio_device_data_observer.h
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_DATA_OBSERVER_H_
+#define WEBRTC_MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_DATA_OBSERVER_H_
+
+#include "webrtc/base/scoped_ref_ptr.h"
+#include "webrtc/modules/audio_device/include/audio_device.h"
+
+namespace webrtc {
+
+// This interface will capture the raw PCM data of both the local captured as
+// well as the mixed/rendered remote audio.
+class AudioDeviceDataObserver {
+ public:
+  virtual void OnCaptureData(const void* audio_samples,
+                             const size_t num_samples,
+                             const size_t bytes_per_sample,
+                             const size_t num_channels,
+                             const uint32_t samples_per_sec) = 0;
+
+  virtual void OnRenderData(const void* audio_samples,
+                            const size_t num_samples,
+                            const size_t bytes_per_sample,
+                            const size_t num_channels,
+                            const uint32_t samples_per_sec) = 0;
+
+  AudioDeviceDataObserver() = default;
+  virtual ~AudioDeviceDataObserver() = default;
+};
+
+// Creates an ADM instance with AudioDeviceDataObserver registered.
+rtc::scoped_refptr<AudioDeviceModule> CreateAudioDeviceWithDataObserver(
+    const int32_t id,
+    const AudioDeviceModule::AudioLayer audio_layer,
+    AudioDeviceDataObserver* observer);
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_DATA_OBSERVER_H_