Adds Analog Gain Control (AGC) to the WebRTC client.

media/audio/mac/audio_low_latency_input_mac_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 "base/basictypes.h"
 #include "base/environment.h"
 #include "base/message_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/platform_thread.h"
 #include "media/audio/audio_io.h"
@@ skipping 10 matching lines @@
 using ::testing::NotNull;
 
 ACTION_P3(CheckCountAndPostQuitTask, count, limit, loop) {
   if (++*count >= limit) {
     loop->PostTask(FROM_HERE, MessageLoop::QuitClosure());
   }
 }
 
 class MockAudioInputCallback : public AudioInputStream::AudioInputCallback {
  public:
-  MOCK_METHOD4(OnData, void(AudioInputStream* stream,
+  MOCK_METHOD5(OnData, void(AudioInputStream* stream,
                             const uint8* src, uint32 size,
-                            uint32 hardware_delay_bytes));
+                            uint32 hardware_delay_bytes, double volume));
   MOCK_METHOD1(OnClose, void(AudioInputStream* stream));
   MOCK_METHOD2(OnError, void(AudioInputStream* stream, int code));
 };
 
 // This audio sink implementation should be used for manual tests only since
 // the recorded data is stored on a raw binary data file.
 // The last test (WriteToFileAudioSink) - which is disabled by default -
 // can use this audio sink to store the captured data on a file for offline
 // analysis.
 class WriteToFileAudioSink : public AudioInputStream::AudioInputCallback {
@@ skipping 22 matching lines @@
       fwrite(chunk, 1, chunk_size, file_);
       buffer_.Seek(chunk_size);
       bytes_written += chunk_size;
     }
     fclose(file_);
   }
 
   // AudioInputStream::AudioInputCallback implementation.
   virtual void OnData(AudioInputStream* stream,
                       const uint8* src, uint32 size,
-                      uint32 hardware_delay_bytes) {
+                      uint32 hardware_delay_bytes, double volume) {
     // Store data data in a temporary buffer to avoid making blocking
     // fwrite() calls in the audio callback. The complete buffer will be
     // written to file in the destructor.
     if (buffer_.Append(src, size)) {
       bytes_to_write_ += size;
     }
   }
 
   virtual void OnClose(AudioInputStream* stream) {}
   virtual void OnError(AudioInputStream* stream, int code) {}
@@ skipping 138 matching lines @@
   int samples_per_packet = fs / 100;
   int bits_per_sample = 16;
   uint32 bytes_per_packet = samples_per_packet * (bits_per_sample / 8);
 
   MockAudioInputCallback sink;
 
   // We use 10ms packets and will run the test until ten packets are received.
   // All should contain valid packets of the same size and a valid delay
   // estimate.
   EXPECT_CALL(sink, OnData(ais, NotNull(), bytes_per_packet,
-                           Ge(bytes_per_packet)))
+                           Ge(bytes_per_packet), _))
       .Times(AtLeast(10))
       .WillRepeatedly(CheckCountAndPostQuitTask(&count, 10, &loop));
   ais->Start(&sink);
   loop.Run();
   ais->Stop();
 
   // Verify that the sink receieves OnClose() call when calling Close().
   EXPECT_CALL(sink, OnClose(ais))
       .Times(1);
   ais->Close();
@@ skipping 15 matching lines @@
   int samples_per_packet = fs / 100;
   int bits_per_sample = 16;
   uint32 bytes_per_packet = 2 * samples_per_packet * (bits_per_sample / 8);
 
   MockAudioInputCallback sink;
 
   // We use 10ms packets and will run the test until ten packets are received.
   // All should contain valid packets of the same size and a valid delay
   // estimate.
   EXPECT_CALL(sink, OnData(ais, NotNull(), bytes_per_packet,
-                           Ge(bytes_per_packet)))
+                           Ge(bytes_per_packet), _))
       .Times(AtLeast(10))
       .WillRepeatedly(CheckCountAndPostQuitTask(&count, 10, &loop));
   ais->Start(&sink);
   loop.Run();
   ais->Stop();
 
   // Verify that the sink receieves OnClose() call when calling Close().
   EXPECT_CALL(sink, OnClose(ais))
       .Times(1);
   ais->Close();
@@ skipping 18 matching lines @@
   fprintf(stderr, "               Sample rate: %d\n", fs);
   WriteToFileAudioSink file_sink(file_name);
   fprintf(stderr, "               >> Speak into the mic while recording...\n");
   ais->Start(&file_sink);
   base::PlatformThread::Sleep(TestTimeouts::action_timeout());
   ais->Stop();
   fprintf(stderr, "               >> Recording has stopped.\n");
   ais->Close();
 }