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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.
// MSVC++ requires this to be set before any other includes to get M_PI.
#define _USE_MATH_DEFINES
#include <cmath>
#include "media/base/fake_audio_render_callback.h"
namespace media {
FakeAudioRenderCallback::FakeAudioRenderCallback(double step)
: half_fill_(false),
step_(step),
last_audio_delay_milliseconds_(-1),
volume_(1) {
reset();
}
FakeAudioRenderCallback::~FakeAudioRenderCallback() {}
int FakeAudioRenderCallback::Render(AudioBus* audio_bus,
int audio_delay_milliseconds) {
last_audio_delay_milliseconds_ = audio_delay_milliseconds;
int number_of_frames = audio_bus->frames();
if (half_fill_)
number_of_frames /= 2;
// Fill first channel with a sine wave.
for (int i = 0; i < number_of_frames; ++i)
audio_bus->channel(0)[i] = sin(2 * M_PI * (x_ + step_ * i));
x_ += number_of_frames * step_;
// Copy first channel into the rest of the channels.
for (int i = 1; i < audio_bus->channels(); ++i)
memcpy(audio_bus->channel(i), audio_bus->channel(0),
number_of_frames * sizeof(*audio_bus->channel(i)));
return number_of_frames;
}
double FakeAudioRenderCallback::ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) {
Render(audio_bus, buffer_delay.InMillisecondsF() + 0.5);
return volume_;
}
} // namespace media
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