media/base/audio_renderer_mixer_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // MSVC++ requires this to be set before any other includes to get M_PI.
   6 #define _USE_MATH_DEFINES
   7 #include <cmath>
   8
   9 #include "base/bind.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/scoped_vector.h"
  13 #include "base/synchronization/waitable_event.h"
  14 #include "base/threading/platform_thread.h"
  15 #include "media/base/audio_renderer_mixer.h"
  16 #include "media/base/audio_renderer_mixer_input.h"
  17 #include "media/base/fake_audio_render_callback.h"
  18 #include "media/base/mock_audio_renderer_sink.h"
  19 #include "testing/gmock/include/gmock/gmock.h"
  20 #include "testing/gtest/include/gtest/gtest.h"
  21
  22 namespace media {
  23
  24 // Parameters which control the many input case tests.
  25 const int kMixerInputs = 8;
  26 const int kMixerCycles = 3;
  27
  28 // Parameters used for testing.
  29 const int kBitsPerChannel = 32;
  30 const ChannelLayout kChannelLayout = CHANNEL_LAYOUT_STEREO;
  31 const int kHighLatencyBufferSize = 8192;
  32 const int kLowLatencyBufferSize = 256;
  33
  34 // Number of full sine wave cycles for each Render() call.
  35 const int kSineCycles = 4;
  36
  37 // Tuple of <input sampling rate, output sampling rate, epsilon>.
  38 typedef std::tr1::tuple<int, int, double> AudioRendererMixerTestData;
  39 class AudioRendererMixerTest
  40     : public testing::TestWithParam<AudioRendererMixerTestData> {
  41  public:
  42   AudioRendererMixerTest()
  43       : epsilon_(std::tr1::get<2>(GetParam())),
  44         half_fill_(false) {
  45     // Create input and output parameters based on test parameters.
  46     input_parameters_ = AudioParameters(
  47         AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout,
  48         std::tr1::get<0>(GetParam()), kBitsPerChannel, kHighLatencyBufferSize);
  49     output_parameters_ = AudioParameters(
  50         AudioParameters::AUDIO_PCM_LOW_LATENCY, kChannelLayout,
  51         std::tr1::get<1>(GetParam()), 16, kLowLatencyBufferSize);
  52
  53     sink_ = new MockAudioRendererSink();
  54     EXPECT_CALL(*sink_.get(), Start());
  55     EXPECT_CALL(*sink_.get(), Stop());
  56
  57     mixer_.reset(new AudioRendererMixer(
  58         input_parameters_, output_parameters_, sink_));
  59     mixer_callback_ = sink_->callback();
  60
  61     audio_bus_ = AudioBus::Create(output_parameters_);
  62     expected_audio_bus_ = AudioBus::Create(output_parameters_);
  63
  64     // Allocate one callback for generating expected results.
  65     double step = kSineCycles / static_cast<double>(
  66         output_parameters_.frames_per_buffer());
  67     expected_callback_.reset(new FakeAudioRenderCallback(step));
  68   }
  69
  70   AudioRendererMixer* GetMixer(const AudioParameters& params) {
  71     return mixer_.get();
  72   }
  73
  74   MOCK_METHOD1(RemoveMixer, void(const AudioParameters&));
  75
  76   void InitializeInputs(int count) {
  77     mixer_inputs_.reserve(count);
  78     fake_callbacks_.reserve(count);
  79
  80     // Setup FakeAudioRenderCallback step to compensate for resampling.
  81     double scale_factor = input_parameters_.sample_rate() /
  82         static_cast<double>(output_parameters_.sample_rate());
  83     double step = kSineCycles / (scale_factor *
  84         static_cast<double>(output_parameters_.frames_per_buffer()));
  85
  86     for (int i = 0; i < count; ++i) {
  87       fake_callbacks_.push_back(new FakeAudioRenderCallback(step));
  88       mixer_inputs_.push_back(new AudioRendererMixerInput(
  89           base::Bind(&AudioRendererMixerTest::GetMixer,
  90                      base::Unretained(this)),
  91           base::Bind(&AudioRendererMixerTest::RemoveMixer,
  92                      base::Unretained(this))));
  93       mixer_inputs_[i]->Initialize(input_parameters_, fake_callbacks_[i]);
  94       mixer_inputs_[i]->SetVolume(1.0f);
  95     }
  96     EXPECT_CALL(*this, RemoveMixer(testing::_)).Times(count);
  97   }
  98
  99   bool ValidateAudioData(int index, int frames, float scale, double epsilon) {
 100     for (int i = 0; i < audio_bus_->channels(); ++i) {
 101       for (int j = index; j < frames; j++) {
 102         double error = fabs(audio_bus_->channel(i)[j] -
 103             expected_audio_bus_->channel(i)[j] * scale);
 104         if (error > epsilon) {
 105           EXPECT_NEAR(expected_audio_bus_->channel(i)[j] * scale,
 106                       audio_bus_->channel(i)[j], epsilon)
 107               << " i=" << i << ", j=" << j;
 108           return false;
 109         }
 110       }
 111     }
 112     return true;
 113   }
 114
 115   bool ValidateAudioData(int index, int frames, float scale) {
 116     return ValidateAudioData(index, frames, scale, epsilon_);
 117   }
 118
 119   bool RenderAndValidateAudioData(float scale) {
 120     if (half_fill_) {
 121       for (size_t i = 0; i < fake_callbacks_.size(); ++i)
 122         fake_callbacks_[i]->set_half_fill(true);
 123       expected_callback_->set_half_fill(true);
 124       // Initialize the AudioBus completely or we'll run into Valgrind problems
 125       // during the verification step below.
 126       expected_audio_bus_->Zero();
 127     }
 128
 129     // Render actual audio data.
 130     int frames = mixer_callback_->Render(audio_bus_.get(), 0);
 131     if (frames != audio_bus_->frames())
 132       return false;
 133
 134     // Render expected audio data (without scaling).
 135     expected_callback_->Render(expected_audio_bus_.get(), 0);
 136
 137     if (half_fill_) {
 138       // In this case, just verify that every frame was initialized, this will
 139       // only fail under tooling such as valgrind.
 140       return ValidateAudioData(
 141           0, frames, 0, std::numeric_limits<double>::max());
 142     } else {
 143       return ValidateAudioData(0, frames, scale);
 144     }
 145   }
 146
 147   // Fill |audio_bus_| fully with |value|.
 148   void FillAudioData(float value) {
 149     for (int i = 0; i < audio_bus_->channels(); ++i) {
 150       std::fill(audio_bus_->channel(i),
 151                 audio_bus_->channel(i) + audio_bus_->frames(), value);
 152     }
 153   }
 154
 155   // Verify silence when mixer inputs are in pre-Start() and post-Start().
 156   void StartTest(int inputs) {
 157     InitializeInputs(inputs);
 158
 159     // Verify silence before any inputs have been started.  Fill the buffer
 160     // before hand with non-zero data to ensure we get zeros back.
 161     FillAudioData(1.0f);
 162     EXPECT_TRUE(RenderAndValidateAudioData(0.0f));
 163
 164     // Start() all even numbered mixer inputs and ensure we still get silence.
 165     for (size_t i = 0; i < mixer_inputs_.size(); i += 2)
 166       mixer_inputs_[i]->Start();
 167     FillAudioData(1.0f);
 168     EXPECT_TRUE(RenderAndValidateAudioData(0.0f));
 169
 170     // Start() all mixer inputs and ensure we still get silence.
 171     for (size_t i = 1; i < mixer_inputs_.size(); i += 2)
 172       mixer_inputs_[i]->Start();
 173     FillAudioData(1.0f);
 174     EXPECT_TRUE(RenderAndValidateAudioData(0.0f));
 175
 176     for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 177       mixer_inputs_[i]->Stop();
 178   }
 179
 180   // Verify output when mixer inputs are in post-Play() state.
 181   void PlayTest(int inputs) {
 182     InitializeInputs(inputs);
 183
 184     // Play() all mixer inputs and ensure we get the right values.
 185     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 186       mixer_inputs_[i]->Start();
 187       mixer_inputs_[i]->Play();
 188     }
 189
 190     for (int i = 0; i < kMixerCycles; ++i)
 191       ASSERT_TRUE(RenderAndValidateAudioData(mixer_inputs_.size()));
 192
 193     for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 194       mixer_inputs_[i]->Stop();
 195   }
 196
 197   // Verify volume adjusted output when mixer inputs are in post-Play() state.
 198   void PlayVolumeAdjustedTest(int inputs) {
 199     InitializeInputs(inputs);
 200
 201     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 202       mixer_inputs_[i]->Start();
 203       mixer_inputs_[i]->Play();
 204     }
 205
 206     // Set a different volume for each mixer input and verify the results.
 207     float total_scale = 0;
 208     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 209       float volume = static_cast<float>(i) / mixer_inputs_.size();
 210       total_scale += volume;
 211       EXPECT_TRUE(mixer_inputs_[i]->SetVolume(volume));
 212     }
 213     for (int i = 0; i < kMixerCycles; ++i)
 214       ASSERT_TRUE(RenderAndValidateAudioData(total_scale));
 215
 216     for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 217       mixer_inputs_[i]->Stop();
 218   }
 219
 220   // Verify output when mixer inputs can only partially fulfill a Render().
 221   void PlayPartialRenderTest(int inputs) {
 222     InitializeInputs(inputs);
 223
 224     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 225       mixer_inputs_[i]->Start();
 226       mixer_inputs_[i]->Play();
 227     }
 228
 229     // Verify a properly filled buffer when half filled (remainder zeroed).
 230     half_fill_ = true;
 231     ASSERT_TRUE(RenderAndValidateAudioData(mixer_inputs_.size()));
 232
 233     for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 234       mixer_inputs_[i]->Stop();
 235   }
 236
 237   // Verify output when mixer inputs are in Pause() state.
 238   void PauseTest(int inputs) {
 239     InitializeInputs(inputs);
 240
 241     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 242       mixer_inputs_[i]->Start();
 243       mixer_inputs_[i]->Play();
 244     }
 245
 246     // Pause() all even numbered mixer inputs and ensure we get the right value.
 247     for (size_t i = 0; i < mixer_inputs_.size(); i += 2)
 248       mixer_inputs_[i]->Pause();
 249     for (int i = 0; i < kMixerCycles; ++i)
 250       ASSERT_TRUE(RenderAndValidateAudioData(mixer_inputs_.size() / 2));
 251
 252     for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 253       mixer_inputs_[i]->Stop();
 254   }
 255
 256   // Verify output when mixer inputs are in post-Stop() state.
 257   void StopTest(int inputs) {
 258     InitializeInputs(inputs);
 259
 260     // Start() and Stop() all inputs.
 261     for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 262       mixer_inputs_[i]->Start();
 263       mixer_inputs_[i]->Stop();
 264     }
 265
 266     // Verify we get silence back; fill |audio_bus_| before hand to be sure.
 267     FillAudioData(1.0f);
 268     EXPECT_TRUE(RenderAndValidateAudioData(0.0f));
 269   }
 270
 271  protected:
 272   virtual ~AudioRendererMixerTest() {}
 273
 274   scoped_refptr<MockAudioRendererSink> sink_;
 275   scoped_ptr<AudioRendererMixer> mixer_;
 276   AudioRendererSink::RenderCallback* mixer_callback_;
 277   AudioParameters input_parameters_;
 278   AudioParameters output_parameters_;
 279   scoped_ptr<AudioBus> audio_bus_;
 280   scoped_ptr<AudioBus> expected_audio_bus_;
 281   std::vector< scoped_refptr<AudioRendererMixerInput> > mixer_inputs_;
 282   ScopedVector<FakeAudioRenderCallback> fake_callbacks_;
 283   scoped_ptr<FakeAudioRenderCallback> expected_callback_;
 284   double epsilon_;
 285   bool half_fill_;
 286
 287   DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerTest);
 288 };
 289
 290 class AudioRendererMixerBehavioralTest : public AudioRendererMixerTest {};
 291
 292 ACTION_P(SignalEvent, event) {
 293   event->Signal();
 294 }
 295
 296 // Verify a mixer with no inputs returns silence for all requested frames.
 297 TEST_P(AudioRendererMixerTest, NoInputs) {
 298   FillAudioData(1.0f);
 299   EXPECT_TRUE(RenderAndValidateAudioData(0.0f));
 300 }
 301
 302 // Test mixer output with one input in the pre-Start() and post-Start() state.
 303 TEST_P(AudioRendererMixerTest, OneInputStart) {
 304   StartTest(1);
 305 }
 306
 307 // Test mixer output with many inputs in the pre-Start() and post-Start() state.
 308 TEST_P(AudioRendererMixerTest, ManyInputStart) {
 309   StartTest(kMixerInputs);
 310 }
 311
 312 // Test mixer output with one input in the post-Play() state.
 313 TEST_P(AudioRendererMixerTest, OneInputPlay) {
 314   PlayTest(1);
 315 }
 316
 317 // Test mixer output with many inputs in the post-Play() state.
 318 TEST_P(AudioRendererMixerTest, ManyInputPlay) {
 319   PlayTest(kMixerInputs);
 320 }
 321
 322 // Test volume adjusted mixer output with one input in the post-Play() state.
 323 TEST_P(AudioRendererMixerTest, OneInputPlayVolumeAdjusted) {
 324   PlayVolumeAdjustedTest(1);
 325 }
 326
 327 // Test volume adjusted mixer output with many inputs in the post-Play() state.
 328 TEST_P(AudioRendererMixerTest, ManyInputPlayVolumeAdjusted) {
 329   PlayVolumeAdjustedTest(kMixerInputs);
 330 }
 331
 332 // Test mixer output with one input and partial Render() in post-Play() state.
 333 TEST_P(AudioRendererMixerTest, OneInputPlayPartialRender) {
 334   PlayPartialRenderTest(1);
 335 }
 336
 337 // Test mixer output with many inputs and partial Render() in post-Play() state.
 338 TEST_P(AudioRendererMixerTest, ManyInputPlayPartialRender) {
 339   PlayPartialRenderTest(kMixerInputs);
 340 }
 341
 342 // Test mixer output with one input in the post-Pause() state.
 343 TEST_P(AudioRendererMixerTest, OneInputPause) {
 344   PauseTest(1);
 345 }
 346
 347 // Test mixer output with many inputs in the post-Pause() state.
 348 TEST_P(AudioRendererMixerTest, ManyInputPause) {
 349   PauseTest(kMixerInputs);
 350 }
 351
 352 // Test mixer output with one input in the post-Stop() state.
 353 TEST_P(AudioRendererMixerTest, OneInputStop) {
 354   StopTest(1);
 355 }
 356
 357 // Test mixer output with many inputs in the post-Stop() state.
 358 TEST_P(AudioRendererMixerTest, ManyInputStop) {
 359   StopTest(kMixerInputs);
 360 }
 361
 362 // Test mixer with many inputs in mixed post-Stop() and post-Play() states.
 363 TEST_P(AudioRendererMixerTest, ManyInputMixedStopPlay) {
 364   InitializeInputs(kMixerInputs);
 365
 366   // Start() all inputs.
 367   for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 368     mixer_inputs_[i]->Start();
 369
 370   // Stop() all even numbered mixer inputs and Play() all odd numbered inputs
 371   // and ensure we get the right value.
 372   for (size_t i = 1; i < mixer_inputs_.size(); i += 2) {
 373     mixer_inputs_[i - 1]->Stop();
 374     mixer_inputs_[i]->Play();
 375   }
 376   ASSERT_TRUE(RenderAndValidateAudioData(std::max(
 377       mixer_inputs_.size() / 2, static_cast<size_t>(1))));
 378
 379   for (size_t i = 1; i < mixer_inputs_.size(); i += 2)
 380     mixer_inputs_[i]->Stop();
 381 }
 382
 383 TEST_P(AudioRendererMixerBehavioralTest, OnRenderError) {
 384   InitializeInputs(kMixerInputs);
 385   for (size_t i = 0; i < mixer_inputs_.size(); ++i) {
 386     mixer_inputs_[i]->Start();
 387     mixer_inputs_[i]->Play();
 388     EXPECT_CALL(*fake_callbacks_[i], OnRenderError()).Times(1);
 389   }
 390
 391   mixer_callback_->OnRenderError();
 392   for (size_t i = 0; i < mixer_inputs_.size(); ++i)
 393     mixer_inputs_[i]->Stop();
 394 }
 395
 396 // Ensure constructing an AudioRendererMixerInput, but not initializing it does
 397 // not call RemoveMixer().
 398 TEST_P(AudioRendererMixerBehavioralTest, NoInitialize) {
 399   EXPECT_CALL(*this, RemoveMixer(testing::_)).Times(0);
 400   scoped_refptr<AudioRendererMixerInput> audio_renderer_mixer =
 401       new AudioRendererMixerInput(
 402           base::Bind(&AudioRendererMixerTest::GetMixer,
 403                      base::Unretained(this)),
 404           base::Bind(&AudioRendererMixerTest::RemoveMixer,
 405                      base::Unretained(this)));
 406 }
 407
 408 // Ensure the physical stream is paused after a certain amount of time with no
 409 // inputs playing.  The test will hang if the behavior is incorrect.
 410 TEST_P(AudioRendererMixerBehavioralTest, MixerPausesStream) {
 411   const base::TimeDelta kPauseTime = base::TimeDelta::FromMilliseconds(500);
 412   // This value can't be too low or valgrind, tsan will timeout on the bots.
 413   const base::TimeDelta kTestTimeout = 10 * kPauseTime;
 414   mixer_->set_pause_delay_for_testing(kPauseTime);
 415
 416   base::WaitableEvent pause_event(true, false);
 417   EXPECT_CALL(*sink_.get(), Pause()).Times(2)
 418       .WillRepeatedly(SignalEvent(&pause_event));
 419   InitializeInputs(1);
 420
 421   // Ensure never playing the input results in a sink pause.
 422   const base::TimeDelta kSleepTime = base::TimeDelta::FromMilliseconds(100);
 423   base::TimeTicks start_time = base::TimeTicks::Now();
 424   while (!pause_event.IsSignaled()) {
 425     mixer_callback_->Render(audio_bus_.get(), 0);
 426     base::PlatformThread::Sleep(kSleepTime);
 427     ASSERT_TRUE(base::TimeTicks::Now() - start_time < kTestTimeout);
 428   }
 429   pause_event.Reset();
 430
 431   // Playing the input for the first time should cause a sink play.
 432   mixer_inputs_[0]->Start();
 433   EXPECT_CALL(*sink_.get(), Play());
 434   mixer_inputs_[0]->Play();
 435   mixer_inputs_[0]->Pause();
 436
 437   // Ensure once the input is paused the sink eventually pauses.
 438   start_time = base::TimeTicks::Now();
 439   while (!pause_event.IsSignaled()) {
 440     mixer_callback_->Render(audio_bus_.get(), 0);
 441     base::PlatformThread::Sleep(kSleepTime);
 442     ASSERT_TRUE(base::TimeTicks::Now() - start_time < kTestTimeout);
 443   }
 444
 445   mixer_inputs_[0]->Stop();
 446 }
 447
 448 INSTANTIATE_TEST_CASE_P(
 449     AudioRendererMixerTest, AudioRendererMixerTest, testing::Values(
 450         // No resampling.
 451         std::tr1::make_tuple(44100, 44100, 0.00000048),
 452
 453         // Upsampling.
 454         std::tr1::make_tuple(44100, 48000, 0.033),
 455
 456         // Downsampling.
 457         std::tr1::make_tuple(48000, 41000, 0.042)));
 458
 459 // Test cases for behavior which is independent of parameters.  Values() doesn't
 460 // support single item lists and we don't want these test cases to run for every
 461 // parameter set.
 462 INSTANTIATE_TEST_CASE_P(
 463     AudioRendererMixerBehavioralTest, AudioRendererMixerBehavioralTest,
 464     testing::ValuesIn(std::vector<AudioRendererMixerTestData>(
 465         1, std::tr1::make_tuple(44100, 44100, 0))));
 466
 467 }  // namespace media