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// Copyright (c) 2013 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_consumer.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/message_loop_proxy.h"
#include "media/base/audio_bus.h"
namespace media {
FakeAudioConsumer::FakeAudioConsumer(
const scoped_refptr<base::MessageLoopProxy>& message_loop,
const AudioParameters& params)
: message_loop_(message_loop),
audio_bus_(AudioBus::Create(params)),
buffer_duration_(base::TimeDelta::FromMicroseconds(
params.frames_per_buffer() * base::Time::kMicrosecondsPerSecond /
static_cast<float>(params.sample_rate()))) {
audio_bus_->Zero();
}
FakeAudioConsumer::~FakeAudioConsumer() {
DCHECK(read_cb_.is_null());
}
void FakeAudioConsumer::Start(const ReadCB& read_cb) {
DCHECK(message_loop_->BelongsToCurrentThread());
DCHECK(read_cb_.is_null());
DCHECK(!read_cb.is_null());
read_cb_ = read_cb;
next_read_time_ = base::Time::Now();
read_task_cb_.Reset(base::Bind(
&FakeAudioConsumer::DoRead, base::Unretained(this)));
message_loop_->PostTask(FROM_HERE, read_task_cb_.callback());
}
void FakeAudioConsumer::Stop() {
DCHECK(message_loop_->BelongsToCurrentThread());
read_cb_.Reset();
read_task_cb_.Cancel();
}
void FakeAudioConsumer::DoRead() {
DCHECK(message_loop_->BelongsToCurrentThread());
DCHECK(!read_cb_.is_null());
read_cb_.Run(audio_bus_.get());
// Need to account for time spent here due to the cost of |read_cb_| as well
// as the imprecision of PostDelayedTask().
base::Time now = base::Time::Now();
base::TimeDelta delay = next_read_time_ + buffer_duration_ - now;
// If we're behind, find the next nearest ontime interval.
if (delay < base::TimeDelta())
delay += buffer_duration_ * (-delay / buffer_duration_ + 1);
next_read_time_ = now + delay;
message_loop_->PostDelayedTask(FROM_HERE, read_task_cb_.callback(), delay);
}
} // namespace media
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