Don't switch to fake audio output until stream open fails.

media/audio/audio_output_proxy_unittest.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "media/audio/audio_output_dispatcher_impl.h"
@@ skipping 599 matching lines @@
   EXPECT_CALL(okay_stream, Close())
       .Times(1);
 
   AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
   EXPECT_TRUE(proxy->Open());
   proxy->Close();
   WaitForCloseTimer(kTestCloseDelayMs);
 }
 
 // Simulate failures to open both the low latency and the fallback high latency
-// stream and ensure AudioOutputResampler terminates normally.
-TEST_F(AudioOutputResamplerTest, LowLatencyFallbackFailed) {
+// stream and ensure AudioOutputResampler falls back to a fake stream.
+TEST_F(AudioOutputResamplerTest, HighLatencyFallbackFailed) {
+  MockAudioOutputStream okay_stream(&manager_, params_);
+
   EXPECT_CALL(manager(), MakeAudioOutputStream(_))
       .Times(2)
       .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));
 
+  // To prevent shared memory issues the sample rate and buffer size should
+  // match the input stream parameters.
+  EXPECT_CALL(manager(), MakeAudioOutputStream(AllOf(
+      testing::Property(&AudioParameters::format, AudioParameters::AUDIO_FAKE),
+      testing::Property(&AudioParameters::sample_rate, params_.sample_rate()),
+      testing::Property(
+          &AudioParameters::frames_per_buffer, params_.frames_per_buffer()))))
+      .Times(1)
+      .WillOnce(Return(&okay_stream));
+  EXPECT_CALL(okay_stream, Open())
+      .WillOnce(Return(true));
+  EXPECT_CALL(okay_stream, Close())
+      .Times(1);
+
+  AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
+  EXPECT_TRUE(proxy->Open());
+  proxy->Close();
+  WaitForCloseTimer(kTestCloseDelayMs);
+}
+
+// Simulate failures to open both the low latency, the fallback high latency
+// stream, and the fake audio output stream and ensure AudioOutputResampler
+// terminates normally.
+TEST_F(AudioOutputResamplerTest, AllFallbackFailed) {
+  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
+      .Times(3)
+      .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));
+
   AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
   EXPECT_FALSE(proxy->Open());
   proxy->Close();
   WaitForCloseTimer(kTestCloseDelayMs);
 }
 
 // Simulate an eventual OpenStream() failure; i.e. successful OpenStream() calls
 // eventually followed by one which fails; root cause of http://crbug.com/150619
 TEST_F(AudioOutputResamplerTest, LowLatencyOpenEventuallyFails) {
   MockAudioOutputStream stream1(&manager_, params_);
@@ skipping 60 matching lines @@
   WaitForCloseTimer(kTestCloseDelayMs);
   EXPECT_TRUE(stream1.stop_called());
   EXPECT_TRUE(stream1.start_called());
   EXPECT_TRUE(stream2.stop_called());
   EXPECT_TRUE(stream2.start_called());
   EXPECT_FALSE(stream3.stop_called());
   EXPECT_FALSE(stream3.start_called());
 }
 
 }  // namespace media