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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.
// A fake implementation of AudioInputStream, useful for testing purpose.
#include <memory>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/scoped_refptr.h"
#include "base/threading/thread.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_parameters.h"
#include "media/base/fake_audio_worker.h"
namespace media {
class AudioBus;
class AudioManagerBase;
// This class acts as a fake audio input stream. The default is to generate a
// beeping sound unless --use-file-for-fake-audio-capture=<file> is specified,
// in which case the indicated .wav file will be read and played into the
// stream.
class MEDIA_EXPORT FakeAudioInputStream
: public AudioInputStream {
static AudioInputStream* MakeFakeStream(
AudioManagerBase* manager, const AudioParameters& params);
bool Open() override;
void Start(AudioInputCallback* callback) override;
void Stop() override;
void Close() override;
double GetMaxVolume() override;
void SetVolume(double volume) override;
double GetVolume() override;
bool IsMuted() override;
bool SetAutomaticGainControl(bool enabled) override;
bool GetAutomaticGainControl() override;
void SetOutputDeviceForAec(const std::string& output_device_id) override;
// Generate one beep sound. This method is called by FakeVideoCaptureDevice to
// test audio/video synchronization. This is a static method because
// FakeVideoCaptureDevice is disconnected from an audio device. This means
// only one instance of this class gets to respond, which is okay because we
// assume there's only one stream for this testing purpose. Furthermore this
// method will do nothing if --use-file-for-fake-audio-capture is specified
// since the input stream will be playing from a file instead of beeping.
// TODO(hclam): Make this non-static. To do this we'll need to fix
// such that video capture device is aware of audio
// input stream.
static void BeepOnce();
// Set the muted state for _all_ FakeAudioInputStreams. The value is global,
// so it can be set before any FakeAudioInputStreams have been created.
static void SetGlobalMutedState(bool is_muted);
FakeAudioInputStream(AudioManagerBase* manager,
const AudioParameters& params);
~FakeAudioInputStream() override;
std::unique_ptr<AudioOutputStream::AudioSourceCallback> ChooseSource();
void ReadAudioFromSource(base::TimeTicks ideal_time, base::TimeTicks now);
AudioManagerBase* audio_manager_;
// |callback_| needs the lock as ReadAudioFromSource reads callback_
// on the capture thread, while callback_ is set on the audio thread.
base::Lock callback_lock_;
AudioInputCallback* callback_ GUARDED_BY(callback_lock_);
AudioParameters params_;
std::unique_ptr<FakeAudioWorker> fake_audio_worker_;
std::unique_ptr<AudioOutputStream::AudioSourceCallback> audio_source_;
std::unique_ptr<media::AudioBus> audio_bus_;
// We will delete the capture thread on the AudioManager worker task runner
// since the audio thread is the main UI thread on Mac.
std::unique_ptr<base::Thread, base::OnTaskRunnerDeleter> capture_thread_;
} // namespace media