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      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 #ifndef MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
      6 #define MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
      7 
      8 #include "media/base/audio_converter.h"
      9 #include "media/base/audio_renderer_sink.h"
     10 #include "testing/gmock/include/gmock/gmock.h"
     11 
     12 namespace media {
     13 
     14 // Fake RenderCallback which will fill each request with a sine wave.  Sine
     15 // state is kept across callbacks.  State can be reset to default via reset().
     16 // Also provide an interface to AudioTransformInput.
     17 class FakeAudioRenderCallback
     18     : public AudioRendererSink::RenderCallback,
     19       public AudioConverter::InputCallback {
     20  public:
     21   // The function used to fulfill Render() is f(x) = sin(2 * PI * x * |step|),
     22   // where x = [|number_of_frames| * m, |number_of_frames| * (m + 1)] and m =
     23   // the number of Render() calls fulfilled thus far.
     24   explicit FakeAudioRenderCallback(double step);
     25   virtual ~FakeAudioRenderCallback();
     26 
     27   // Renders a sine wave into the provided audio data buffer.  If |half_fill_|
     28   // is set, will only fill half the buffer.
     29   virtual int Render(AudioBus* audio_bus,
     30                      int audio_delay_milliseconds) OVERRIDE;
     31   MOCK_METHOD0(OnRenderError, void());
     32 
     33   // AudioTransform::ProvideAudioTransformInput implementation.
     34   virtual double ProvideInput(AudioBus* audio_bus,
     35                               base::TimeDelta buffer_delay) OVERRIDE;
     36 
     37   // Toggles only filling half the requested amount during Render().
     38   void set_half_fill(bool half_fill) { half_fill_ = half_fill; }
     39 
     40   // Reset the sine state to initial value.
     41   void reset() { x_ = 0; }
     42 
     43   // Returns the last |audio_delay_milliseconds| provided to Render() or -1 if
     44   // no Render() call occurred.
     45   int last_audio_delay_milliseconds() { return last_audio_delay_milliseconds_; }
     46 
     47   // Set volume information used by ProvideAudioTransformInput().
     48   void set_volume(double volume) { volume_ = volume; }
     49 
     50  private:
     51   bool half_fill_;
     52   double x_;
     53   double step_;
     54   int last_audio_delay_milliseconds_;
     55   double volume_;
     56 
     57   DISALLOW_COPY_AND_ASSIGN(FakeAudioRenderCallback);
     58 };
     59 
     60 }  // namespace media
     61 
     62 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
     63