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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.
#include "media/audio/fake_audio_input_stream.h"
#include "base/bind.h"
#include "media/audio/audio_manager_base.h"
using base::Time;
using base::TimeDelta;
AudioInputStream* FakeAudioInputStream::MakeFakeStream(
AudioManagerBase* manager,
const AudioParameters& params) {
return new FakeAudioInputStream(manager, params);
}
FakeAudioInputStream::FakeAudioInputStream(AudioManagerBase* manager,
const AudioParameters& params)
: audio_manager_(manager),
callback_(NULL),
buffer_size_((params.channels() * params.bits_per_sample() *
params.frames_per_buffer()) / 8),
thread_("FakeAudioRecordingThread"),
callback_interval_(base::TimeDelta::FromMilliseconds(
(params.frames_per_buffer() * 1000) / params.sample_rate())) {
}
FakeAudioInputStream::~FakeAudioInputStream() {}
bool FakeAudioInputStream::Open() {
buffer_.reset(new uint8[buffer_size_]);
memset(buffer_.get(), 0, buffer_size_);
return true;
}
void FakeAudioInputStream::Start(AudioInputCallback* callback) {
DCHECK(!thread_.IsRunning());
callback_ = callback;
last_callback_time_ = Time::Now();
thread_.Start();
thread_.message_loop()->PostDelayedTask(
FROM_HERE,
base::Bind(&FakeAudioInputStream::DoCallback, base::Unretained(this)),
callback_interval_);
}
void FakeAudioInputStream::DoCallback() {
DCHECK(callback_);
callback_->OnData(this, buffer_.get(), buffer_size_, buffer_size_);
Time now = Time::Now();
base::TimeDelta next_callback_time =
last_callback_time_ + callback_interval_ * 2 - now;
// If we are falling behind, try to catch up as much as we can in the next
// callback.
if (next_callback_time < base::TimeDelta())
next_callback_time = base::TimeDelta();
last_callback_time_ = now;
thread_.message_loop()->PostDelayedTask(
FROM_HERE,
base::Bind(&FakeAudioInputStream::DoCallback, base::Unretained(this)),
next_callback_time);
}
void FakeAudioInputStream::Stop() {
thread_.Stop();
}
void FakeAudioInputStream::Close() {
if (callback_) {
callback_->OnClose(this);
callback_ = NULL;
}
audio_manager_->ReleaseInputStream(this);
}
double FakeAudioInputStream::GetMaxVolume() {
return 0.0;
}
void FakeAudioInputStream::SetVolume(double volume) {}
double FakeAudioInputStream::GetVolume() {
return 0.0;
}
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