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// Copyright 2014 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.
#ifndef COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_LIST_H_
#define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_LIST_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
namespace base {
class TickClock;
}
namespace media {
class AudioBusRefCounted;
}
namespace copresence {
struct AudioDirective final {
// Default ctor, required by the priority queue.
AudioDirective();
AudioDirective(const std::string& op_id, base::TimeTicks end_time);
std::string op_id;
// We're currently using TimeTicks to track time. This may not work for cases
// where your machine suspends. See crbug.com/426136
base::TimeTicks end_time;
};
// This class maintains a list of active audio directives. It fetches the audio
// samples associated with a audio transmit directives and expires directives
// that have outlived their TTL.
// TODO(rkc): Once we implement more token technologies, move reusable code
// from here to a base class and inherit various XxxxDirectiveList
// classes from it.
class AudioDirectiveList {
public:
AudioDirectiveList();
~AudioDirectiveList();
void AddDirective(const std::string& op_id, base::TimeDelta ttl);
void RemoveDirective(const std::string& op_id);
scoped_ptr<AudioDirective> GetActiveDirective();
private:
// Comparator for comparing end_times on audio tokens.
class LatestFirstComparator {
public:
// This will sort our queue with the 'latest' time being the top.
bool operator()(const AudioDirective& left,
const AudioDirective& right) const {
return left.end_time < right.end_time;
}
};
std::vector<AudioDirective>::iterator FindDirectiveByOpId(
const std::string& op_id);
// This vector will be organized as a heap with the latest time as the first
// element. Only currently active directives will exist in this list.
std::vector<AudioDirective> active_directives_;
scoped_ptr<base::TickClock> clock_;
DISALLOW_COPY_AND_ASSIGN(AudioDirectiveList);
};
} // namespace copresence
#endif // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_LIST_H_
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