Don't fallback if we've successfully opened a stream previously.

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 "base/threading/platform_thread.h"
@@ skipping 849 matching lines @@
   EXPECT_CALL(manager(), MakeAudioOutputStream(_))
       .Times(2)
       .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));
 
   AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
   EXPECT_FALSE(proxy->Open());
   proxy->Close();
   WaitForCloseTimer(kTestCloseDelayMs);
 }
 
+TEST_F(AudioOutputResamplerTest, LowLatencyOpenEventuallyFails) {
+  MockAudioOutputStream stream1(params_);
+  MockAudioOutputStream stream2(params_);
+  MockAudioOutputStream stream3(params_);
+
+  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
+      .WillOnce(Return(&stream1))
+      .WillOnce(Return(&stream2))
+      .WillOnce(Return(&stream3))
+      .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));
+
+  EXPECT_CALL(stream1, Open())

[scherkus (not reviewing), 2012/09/21 01:24:18]

can you sprinkle a one-liner comment before each stream block so we know what's
going on?

[DaleCurtis, 2012/09/21 02:57:27]

Done.

+      .WillOnce(Return(true));
+  EXPECT_CALL(stream1, Close())
+      .Times(1);
+  EXPECT_CALL(stream1, SetVolume(_))
+      .Times(1);
+
+  EXPECT_CALL(stream2, Open())
+      .WillOnce(Return(true));
+  EXPECT_CALL(stream2, Close())
+      .Times(1);
+  EXPECT_CALL(stream2, SetVolume(_))
+      .Times(1);
+
+  EXPECT_CALL(stream3, Open())
+      .WillOnce(Return(false));
+  EXPECT_CALL(stream3, Close())
+      .Times(1);
+
+  AudioOutputProxy* proxy1 = new AudioOutputProxy(resampler_);
+  EXPECT_TRUE(proxy1->Open());
+  proxy1->Start(&callback_);
+  OnStart();
+
+  AudioOutputProxy* proxy2 = new AudioOutputProxy(resampler_);
+  EXPECT_TRUE(proxy2->Open());
+  proxy2->Start(&callback_);
+  OnStart();
+
+  AudioOutputProxy* proxy3 = new AudioOutputProxy(resampler_);
+  EXPECT_FALSE(proxy3->Open());
+
+  proxy3->Stop();
+  proxy3->Close();
+  proxy2->Stop();
+  proxy2->Close();
+  proxy1->Stop();
+  proxy1->Close();
+
+  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