Added an "enable-audio-processor" flag and WebRtcAudioProcessor class

content/renderer/media/webrtc_audio_processor_unittest.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "content/public/common/content_switches.h"
+#include "content/renderer/media/rtc_media_constraints.h"
+#include "content/renderer/media/webrtc_audio_processor.h"
+#include "media/audio/audio_parameters.h"
+#include "media/base/audio_bus.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
+
+using ::testing::_;
+using ::testing::AnyNumber;
+using ::testing::AtLeast;
+using ::testing::Return;
+
+namespace content {
+
+namespace {
+
+#if defined(ANDROID)
+const int kAudioProcessingSampleRate = 16000;
+#else
+const int kAudioProcessingSampleRate = 32000;
+#endif
+const int kAudioProcessingNumberOfChannel = 1;
+
+// The number of packers used for testing.
+const int kNumberOfPacketsForTest = 100;
+
+void ReadDataFromSpeechFile(char* data, int length) {
+  base::FilePath file;
+  CHECK(PathService::Get(base::DIR_SOURCE_ROOT, &file));
+  file = file.Append(FILE_PATH_LITERAL("media"))
+             .Append(FILE_PATH_LITERAL("test"))
+             .Append(FILE_PATH_LITERAL("data"))
+             .Append(FILE_PATH_LITERAL("speech_16b_stereo_48kHz.raw"));
+  DCHECK(base::PathExists(file));
+  int64 data_file_size64 = 0;
+  DCHECK(file_util::GetFileSize(file, &data_file_size64));
+  EXPECT_EQ(length, file_util::ReadFile(file, data, length));
+  DCHECK(data_file_size64 > length);
+}
+
+// Constant constraint keys which enables default audio constraints on
+// mediastreams with audio.
+struct {
+  const char* key;
+  const char* value;
+} const kDefaultAudioConstraints[] = {
+  { webrtc::MediaConstraintsInterface::kEchoCancellation,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+#if defined(OS_CHROMEOS) || defined(OS_MACOSX)
+  // Enable the extended filter mode AEC on platforms with known echo issues.
+  { webrtc::MediaConstraintsInterface::kExperimentalEchoCancellation,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+#endif
+  { webrtc::MediaConstraintsInterface::kAutoGainControl,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+  { webrtc::MediaConstraintsInterface::kExperimentalAutoGainControl,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+  { webrtc::MediaConstraintsInterface::kNoiseSuppression,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+  { webrtc::MediaConstraintsInterface::kHighpassFilter,
+    webrtc::MediaConstraintsInterface::kValueTrue },
+};
+
+void ApplyFixedAudioConstraints(RTCMediaConstraints* constraints) {
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kDefaultAudioConstraints); ++i) {

[DaleCurtis, 2013/11/06 00:21:18]

just arraysize() should be fine here since it's a global value.

[no longer working on chromium, 2013/11/06 16:45:14]

The compiler complains about:
no matching function for call to ‘ArraySizeHelper(const
content::{anonymous}::<anonymous struct> [5])’

+    constraints->AddMandatory(kDefaultAudioConstraints[i].key,
+                              kDefaultAudioConstraints[i].value, false);
+  }
+}
+
+}  // namespace
+
+class WebRtcAudioProcessorTest : public ::testing::Test {
+ protected:
+  virtual void SetUp() OVERRIDE {

[DaleCurtis, 2013/11/06 00:21:18]

Why SetUp instead of constructor?

[no longer working on chromium, 2013/11/06 16:45:14]

Fine with using the constructor.

+    CommandLine::ForCurrentProcess()->AppendSwitch(

[DaleCurtis, 2013/11/06 00:21:18]

Is this the right way to do this?  Will this affect other tests?  Should you
instead have a enable_for_testing() method?

[no longer working on chromium, 2013/11/06 16:45:14]

I am going to see if this will affect other content unittest, and might have to
switch to enable_for_testing() if this approach turns on the switch for other
unittest.

[no longer working on chromium, 2013/11/07 14:43:12]

It proves to be the correct approach, and setting up the switch here won't
affect other content unittests.

+        switches::kEnableAudioTrackProcessing);
+    params_.Reset(media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
+                  media::CHANNEL_LAYOUT_STEREO, 2, 0, 48000, 16, 512);
+
+  }
+
+  media::AudioParameters params_;
+};
+
+TEST_F(WebRtcAudioProcessorTest, WithoutAudioProcessing) {
+  // Setup the audio processor with empty constraint.
+  RTCMediaConstraints constraints;
+  scoped_ptr<WebRtcAudioProcessor> audio_processor(
+      new WebRtcAudioProcessor(&constraints));
+  audio_processor->SetCaptureFormat(params_);
+  EXPECT_FALSE(audio_processor->has_audio_processing());
+
+  // Read the audio data from a file.

[DaleCurtis, 2013/11/06 00:21:18]

There's a lot of common setup here, move to a class method?

[no longer working on chromium, 2013/11/06 16:45:14]

OK, I will address this comment in a later version.

[no longer working on chromium, 2013/11/07 14:43:12]

Done

+  const int packet_size = params_.frames_per_buffer() * 2 * params_.channels();
+  const size_t length = packet_size * kNumberOfPacketsForTest;
+  scoped_ptr<char[]> capture_data(new char[length]);
+  ReadDataFromSpeechFile(capture_data.get(), length);
+  const int16* data_ptr = reinterpret_cast<const int16*>(capture_data.get());
+  scoped_ptr<media::AudioBus> data_bus = media::AudioBus::Create(
+      params_.channels(), params_.frames_per_buffer());
+  for (int i = 0; i < kNumberOfPacketsForTest; ++i) {
+    data_bus->FromInterleaved(data_ptr, data_bus->frames(), 2);
+    audio_processor->PushCaptureData(data_bus.get());
+
+    // Feed data as render data to the processor, this does not cost anything
+    // when the audio processing is off in the processor.
+    audio_processor->FeedRenderDataToAudioProcessing(

[DaleCurtis, 2013/11/06 00:21:18]

Not sure how this compiles??

[no longer working on chromium, 2013/11/06 16:45:14]

Done.

+        data_ptr,
+        params_.sample_rate(), params_.channels(),
+        params_.frames_per_buffer(), 10);
+
+    // Process and consume the data in the processor.

[DaleCurtis, 2013/11/06 00:21:18]

Ditto for all this.

[no longer working on chromium, 2013/11/07 14:43:12]

Done.

+    int16* output = NULL;
+    while(audio_processor->ProcessAndConsume10MsData(10, 255, false, &output)) {
+      EXPECT_TRUE(output != NULL);
+      EXPECT_EQ(audio_processor->OutputFormat().sample_rate(),
+                params_.sample_rate());
+      EXPECT_EQ(audio_processor->OutputFormat().channels(),
+                params_.channels());
+      EXPECT_EQ(audio_processor->OutputFormat().frames_per_buffer(),
+                params_.sample_rate() / 100);
+    }
+
+    data_ptr += params_.frames_per_buffer() * params_.channels();
+  }
+}
+
+TEST_F(WebRtcAudioProcessorTest, WithAudioProcessing) {
+  // Setup the audio processor with default constraint.
+  RTCMediaConstraints constraints;
+  ApplyFixedAudioConstraints(&constraints);
+  scoped_ptr<WebRtcAudioProcessor> audio_processor(
+      new WebRtcAudioProcessor(&constraints));
+  audio_processor->SetCaptureFormat(params_);
+  EXPECT_TRUE(audio_processor->has_audio_processing());
+
+  // Read the audio data from a file.
+  const int packet_size = params_.frames_per_buffer() * 2 * params_.channels();
+  const size_t length = packet_size * kNumberOfPacketsForTest;
+  scoped_ptr<char[]> capture_data(new char[length]);
+  ReadDataFromSpeechFile(capture_data.get(), length);
+  const int16* data_ptr = reinterpret_cast<const int16*>(capture_data.get());
+  scoped_ptr<media::AudioBus> data_bus = media::AudioBus::Create(
+      params_.channels(), params_.frames_per_buffer());
+  for (int i = 0; i < kNumberOfPacketsForTest; ++i) {
+    data_bus->FromInterleaved(data_ptr, data_bus->frames(), 2);
+    audio_processor->PushCaptureData(data_bus.get());
+
+    // Feed data as render data to the processor.
+    audio_processor->FeedRenderDataToAudioProcessing(
+        data_ptr,
+        params_.sample_rate(), params_.channels(),
+        params_.frames_per_buffer(), 10);
+
+    // Process and consume the data in the processor.
+    int16* output = NULL;
+    while(audio_processor->ProcessAndConsume10MsData(10, 255, false, &output)) {
+      EXPECT_TRUE(output != NULL);
+      EXPECT_EQ(audio_processor->OutputFormat().sample_rate(),
+                kAudioProcessingSampleRate);
+      EXPECT_EQ(audio_processor->OutputFormat().channels(),
+                kAudioProcessingNumberOfChannel);
+      EXPECT_EQ(audio_processor->OutputFormat().frames_per_buffer(),
+                kAudioProcessingSampleRate / 100);
+    }
+
+    data_ptr += params_.frames_per_buffer() * params_.channels();
+  }
+}
+
+}  // namespace content