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// 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.
#ifndef MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
#define MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
#include <stdint.h>
#include "base/time/time.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_renderer_sink.h"
#include "testing/gmock/include/gmock/gmock.h"
namespace media {
// Fake RenderCallback which will fill each request with a sine wave. Sine
// state is kept across callbacks. State can be reset to default via reset().
// Also provide an interface to AudioTransformInput.
class FakeAudioRenderCallback
: public AudioRendererSink::RenderCallback,
public AudioConverter::InputCallback {
public:
// The function used to fulfill Render() is f(x) = sin(2 * PI * x * |step|),
// where x = [|number_of_frames| * m, |number_of_frames| * (m + 1)] and m =
// the number of Render() calls fulfilled thus far.
FakeAudioRenderCallback(double step, int sample_rate);
FakeAudioRenderCallback(const FakeAudioRenderCallback&) = delete;
FakeAudioRenderCallback& operator=(const FakeAudioRenderCallback&) = delete;
~FakeAudioRenderCallback() override;
// Renders a sine wave into the provided audio data buffer. If |half_fill_|
// is set, will only fill half the buffer.
int Render(base::TimeDelta delay,
base::TimeTicks delay_timestamp,
int prior_frames_skipped,
AudioBus* audio_bus) override;
MOCK_METHOD0(OnRenderError, void());
// AudioTransform::ProvideAudioTransformInput implementation.
double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
// Toggles only filling half the requested amount during Render().
void set_half_fill(bool half_fill) { half_fill_ = half_fill; }
// Reset the sine state to initial value.
void reset() { x_ = 0; }
// Returns the last |delay| provided to Render() or base::TimeDelta::Max()
// if no Render() call occurred.
base::TimeDelta last_delay() const { return last_delay_; }
// Set volume information used by ProvideAudioTransformInput().
void set_volume(double volume) { volume_ = volume; }
int last_channel_count() const { return last_channel_count_; }
private:
int RenderInternal(AudioBus* audio_bus, base::TimeDelta delay, double volume);
bool half_fill_;
double x_;
double step_;
base::TimeDelta last_delay_;
int last_channel_count_;
double volume_;
int sample_rate_;
};
} // namespace media
#endif // MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
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