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// Copyright (c) 2010 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"
using base::Time;
using base::TimeDelta;
AudioInputStream* FakeAudioInputStream::MakeFakeStream(int channels,
int bits_per_sample,
int sampling_rate,
int samples_per_packet) {
return new FakeAudioInputStream(channels, bits_per_sample, sampling_rate,
samples_per_packet);
}
FakeAudioInputStream::FakeAudioInputStream(int channels, int bits_per_sample,
int sampling_rate,
int samples_per_packet)
: callback_(NULL),
buffer_size_((channels * bits_per_sample * samples_per_packet) / 8),
thread_("FakeAudioRecordingThread"),
callback_interval_ms_((samples_per_packet * 1000) / sampling_rate) {
// This object is ref counted (so that it can be used with Thread, PostTask)
// but the caller expects a plain pointer. So we take a reference here and
// will Release() ourselves in Close().
AddRef();
}
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,
NewRunnableMethod(this, &FakeAudioInputStream::DoCallback),
callback_interval_ms_);
}
void FakeAudioInputStream::DoCallback() {
DCHECK(callback_);
callback_->OnData(this, buffer_.get(), buffer_size_);
Time now = Time::Now();
int64 next_callback_ms = (last_callback_time_ +
TimeDelta::FromMilliseconds(callback_interval_ms_ * 2) -
now).InMilliseconds();
// If we are falling behind, try to catch up as much as we can in the next
// callback.
if (next_callback_ms < 0)
next_callback_ms = 0;
last_callback_time_ = now;
thread_.message_loop()->PostDelayedTask(
FROM_HERE,
NewRunnableMethod(this, &FakeAudioInputStream::DoCallback),
next_callback_ms);
}
void FakeAudioInputStream::Stop() {
thread_.Stop();
}
void FakeAudioInputStream::Close() {
if (callback_) {
callback_->OnClose(this);
callback_ = NULL;
}
Release(); // Destoys this object.
}
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