[Hotword] Adding audio parameters to handle audio coming from the DSP.

media/audio/cras/cras_input_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/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
 #include "base/time/time.h"
 #include "media/audio/cras/audio_manager_cras.h"
@@ skipping 194 matching lines @@
     SCOPED_TRACE(testing::Message() << "Stereo " << rates[i] << "Hz");
     AudioParameters params_stereo(kTestFormat,
                                   CHANNEL_LAYOUT_STEREO,
                                   rates[i],
                                   kTestBitsPerSample,
                                   kTestFramesPerPacket);
     CaptureSomeFrames(params_stereo, kTestCaptureDurationMs);
   }
 }
 
+TEST_F(CrasInputStreamTest, HotwordSampleReady) {
+  AudioParameters params(kTestFormat,
+                         CHANNEL_LAYOUT_MONO,
+                         kTestSampleRate,
+                         kTestBitsPerSample,
+                         kTestFramesPerPacket,
+                         HARDWARE_INPUT);
+  CrasInputStream* test_stream =
+      new CrasInputStream(params, mock_manager_.get(),
+                          AudioManagerBase::kDefaultDeviceId);
+  ASSERT_TRUE(test_stream->Open());
+
+  MockAudioInputCallback mock_callback;
+  base::WaitableEvent event(false, false);
+  EXPECT_CALL(mock_callback, OnData(test_stream, _, _, _))
+    .WillOnce(InvokeWithoutArgs(&event, &base::WaitableEvent::Signal));
+  test_stream->Start(&mock_callback);
+
+  // Wait for samples to be captured.
+  EXPECT_TRUE(event.TimedWait(TestTimeouts::action_timeout()));
+
+  test_stream->Stop();
+  test_stream->Close();
+}
+
 }  // namespace media