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// Copyright 2016 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 CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_MANAGER_H_
#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_MANAGER_H_
#include <map>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "chromecast/public/media/media_pipeline_backend.h"
#include "chromecast/public/media/media_pipeline_device_params.h"
namespace base {
template <typename T>
struct DefaultLazyInstanceTraits;
} // namespace base
namespace chromecast {
namespace media {
// This class manages created media pipelines, and provides volume control by
// stream type.
// All functions in this class should be called on the media thread.
class MediaPipelineBackendManager {
public:
// Create media pipeline backend.
static MediaPipelineBackend* CreateMediaPipelineBackend(
const MediaPipelineDeviceParams& params);
// Create media pipeline backend with a specific stream_type.
static MediaPipelineBackend* CreateMediaPipelineBackend(
const MediaPipelineDeviceParams& params,
int stream_type);
// Internal clean up when a new media pipeline backend is destroyed.
static void OnMediaPipelineBackendDestroyed(
const MediaPipelineBackend* backend);
// Sets the relative volume for a specified stream type,
// with range [0.0, 1.0] inclusive. If |multiplier| is outside the
// range [0.0, 1.0], it is clamped to that range.
// TODO(tianyuwang): change stream_type to use a enum.
static void SetVolumeMultiplier(int stream_type, float volume);
private:
friend struct base::DefaultLazyInstanceTraits<MediaPipelineBackendManager>;
// Returns a pointer to a singleton instance of the
// MediaPipelineBackendManager.
static MediaPipelineBackendManager* Get();
MediaPipelineBackendManager();
~MediaPipelineBackendManager();
float GetVolumeMultiplier(int stream_type);
// A vector that stores all of the existing media_pipeline_backends_.
std::vector<MediaPipelineBackend*> media_pipeline_backends_;
// Volume multiplier for each type of audio streams.
std::map<int, float> volume_by_stream_type_;
DISALLOW_COPY_AND_ASSIGN(MediaPipelineBackendManager);
};
} // namespace media
} // namespace chromecast
#endif // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_BACKEND_MANAGER_H_
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