/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "cobalt/audio/audio_node_output.h"

#include "base/logging.h"
#include "cobalt/audio/audio_context.h"
#include "cobalt/audio/audio_node.h"
#include "cobalt/audio/audio_node_input.h"

namespace cobalt {
namespace audio {

typedef ::media::ShellAudioBus ShellAudioBus;

AudioNodeOutput::~AudioNodeOutput() {
  owner_node_->audio_lock()->AssertLocked();

  DCHECK(inputs_.empty());
}

void AudioNodeOutput::AddInput(AudioNodeInput* input) {
  owner_node_->audio_lock()->AssertLocked();

  DCHECK(input);

  inputs_.insert(input);
}

void AudioNodeOutput::RemoveInput(AudioNodeInput* input) {
  owner_node_->audio_lock()->AssertLocked();

  DCHECK(input);

  inputs_.erase(input);
}

void AudioNodeOutput::DisconnectAll() {
  owner_node_->audio_lock()->AssertLocked();

  while (!inputs_.empty()) {
    AudioNodeInput* input = *inputs_.begin();
    input->Disconnect(this);
  }
}

scoped_ptr<ShellAudioBus> AudioNodeOutput::PassAudioBusFromSource(
    int32 number_of_frames, SampleType sample_type) {
  // This is called by Audio thread.
  owner_node_->audio_lock()->AssertLocked();

  // Pull audio buffer from its owner node.
  return owner_node_->PassAudioBusFromSource(number_of_frames, sample_type)
      .Pass();
}

}  // namespace audio
}  // namespace cobalt