AEC Refactoring:

* Adds pointer to low level AecCore struct.
* Adds a simple unit test of this new call.

Tested with audioproc_unittest, trybots

TEST=none
BUG=none

Review URL: https://webrtc-codereview.appspot.com/1121006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3577 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_processing/aec/echo_cancellation.c

@@ -700,6 +700,13 @@ WebRtc_Word32 WebRtcAec_get_error_code(void *aecInst)
     return aecpc->lastError;
 }
 
+AecCore* WebRtcAec_aec_core(void* handle) {
+  if (!handle) {
+    return NULL;
+  }
+  return ((aecpc_t*) handle)->aec;
+}
+
 static int EstBufDelay(aecpc_t* aecpc) {
   int nSampSndCard = aecpc->msInSndCardBuf * sampMsNb * aecpc->rate_factor;
   int current_delay = nSampSndCard - WebRtcAec_system_delay(aecpc->aec);

webrtc/modules/audio_processing/aec/echo_cancellation_unittest.cc

@@ -0,0 +1,50 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+// TODO(bjornv): Make this a comprehensive test.
+
+#include "webrtc/modules/audio_processing/aec/include/echo_cancellation.h"
+
+#include <cstdlib>
+#include <ctime>
+
+extern "C" {
+#include "webrtc/modules/audio_processing/aec/aec_core.h"
+}
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace webrtc {
+
+TEST(EchoCancellationTest, CreateAndFreeHandlesErrors) {
+  EXPECT_EQ(-1, WebRtcAec_Create(NULL));
+  void* handle = NULL;
+  ASSERT_EQ(0, WebRtcAec_Create(&handle));
+  EXPECT_TRUE(handle != NULL);
+  EXPECT_EQ(-1, WebRtcAec_Free(NULL));
+  EXPECT_EQ(0, WebRtcAec_Free(handle));
+}
+
+TEST(EchoCancellationTest, ApplyAecCoreHandle) {
+  void* handle = NULL;
+  ASSERT_EQ(0, WebRtcAec_Create(&handle));
+  EXPECT_TRUE(handle != NULL);
+  EXPECT_TRUE(WebRtcAec_aec_core(NULL) == NULL);
+  AecCore* aec_core = WebRtcAec_aec_core(handle);
+  EXPECT_TRUE(aec_core != NULL);
+  // A simple test to verify that we can set and get a value from the lower
+  // level |aec_core| handle.
+  int delay = 111;
+  WebRtcAec_SetSystemDelay(aec_core, delay);
+  EXPECT_EQ(delay, WebRtcAec_system_delay(aec_core));
+  EXPECT_EQ(0, WebRtcAec_Free(handle));
+}
+
+}  // namespace webrtc

webrtc/modules/audio_processing/aec/include/echo_cancellation.h

@@ -56,6 +56,8 @@ typedef struct {
     AecLevel aNlp;
 } AecMetrics;
 
+struct AecCore;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -240,6 +242,16 @@ int WebRtcAec_GetDelayMetrics(void* handle, int* median, int* std);
  */
 WebRtc_Word32 WebRtcAec_get_error_code(void *aecInst);
 
+// Returns a pointer to the low level AEC handle.
+//
+// Input:
+//  - handle                    : Pointer to the AEC instance.
+//
+// Return value:
+//  - AecCore pointer           : NULL for error.
+//
+struct AecCore* WebRtcAec_aec_core(void* handle);
+
 #ifdef __cplusplus
 }
 #endif

webrtc/modules/audio_processing/audio_processing_tests.gypi

@@ -31,6 +31,7 @@
       ],
       'sources': [
         'aec/system_delay_unittest.cc',
+        'aec/echo_cancellation_unittest.cc',
         'test/unit_test.cc',
         'utility/delay_estimator_unittest.cc',
         'utility/ring_buffer_unittest.cc',