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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/virtual_audio_output_stream.h"
#include "base/message_loop_proxy.h"
#include "media/audio/virtual_audio_input_stream.h"
namespace media {
VirtualAudioOutputStream::VirtualAudioOutputStream(
const AudioParameters& params, base::MessageLoopProxy* message_loop,
VirtualAudioInputStream* target, const AfterCloseCallback& after_close_cb)
: params_(params), message_loop_(message_loop),
target_input_stream_(target), after_close_cb_(after_close_cb),
callback_(NULL), volume_(1.0f) {
DCHECK(params_.IsValid());
DCHECK(message_loop_);
DCHECK(target);
}
VirtualAudioOutputStream::~VirtualAudioOutputStream() {
DCHECK(!callback_);
}
bool VirtualAudioOutputStream::Open() {
DCHECK(message_loop_->BelongsToCurrentThread());
return true;
}
void VirtualAudioOutputStream::Start(AudioSourceCallback* callback) {
DCHECK(message_loop_->BelongsToCurrentThread());
DCHECK(!callback_);
callback_ = callback;
target_input_stream_->AddOutputStream(this, params_);
}
void VirtualAudioOutputStream::Stop() {
DCHECK(message_loop_->BelongsToCurrentThread());
if (callback_) {
callback_ = NULL;
target_input_stream_->RemoveOutputStream(this, params_);
}
}
void VirtualAudioOutputStream::Close() {
DCHECK(message_loop_->BelongsToCurrentThread());
Stop();
// If a non-null AfterCloseCallback was provided to the constructor, invoke it
// here. The callback is moved to a stack-local first since |this| could be
// destroyed during Run().
if (!after_close_cb_.is_null()) {
const AfterCloseCallback cb = after_close_cb_;
after_close_cb_.Reset();
cb.Run(this);
}
}
void VirtualAudioOutputStream::SetVolume(double volume) {
DCHECK(message_loop_->BelongsToCurrentThread());
volume_ = volume;
}
void VirtualAudioOutputStream::GetVolume(double* volume) {
DCHECK(message_loop_->BelongsToCurrentThread());
*volume = volume_;
}
double VirtualAudioOutputStream::ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) {
DCHECK(message_loop_->BelongsToCurrentThread());
DCHECK(callback_);
const int frames = callback_->OnMoreData(audio_bus, AudioBuffersState());
if (frames < audio_bus->frames())
audio_bus->ZeroFramesPartial(frames, audio_bus->frames() - frames);
return frames > 0 ? volume_ : 0;
}
} // namespace media
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