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// Copyright (c) 2011 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 MEDIA_BASE_MEDIA_FORMAT_H_
#define MEDIA_BASE_MEDIA_FORMAT_H_
#include <map>
#include <string>
#include "base/values.h"
namespace media {
// MediaFormat is used to describe the output of a Filter to determine whether
// a downstream filter can accept the output from an upstream filter.
//
// For example, an audio decoder could output key-values for the number of
// channels and the sample rate. A downstream audio renderer would use this
// information to properly initialize the audio hardware before playback
// started.
class MediaFormat {
public:
// Common keys.
static const char kURL[];
static const char kSurfaceType[];
static const char kSurfaceFormat[];
static const char kSampleRate[];
static const char kSampleBits[];
static const char kChannels[];
static const char kWidth[];
static const char kHeight[];
MediaFormat();
~MediaFormat();
// Basic map operations.
bool empty() const { return value_map_.empty(); }
bool Contains(const std::string& key) const;
void Clear();
// Value accessors.
void SetAsBoolean(const std::string& key, bool in_value);
void SetAsInteger(const std::string& key, int in_value);
void SetAsReal(const std::string& key, double in_value);
void SetAsString(const std::string& key, const std::string& in_value);
bool GetAsBoolean(const std::string& key, bool* out_value) const;
bool GetAsInteger(const std::string& key, int* out_value) const;
bool GetAsReal(const std::string& key, double* out_value) const;
bool GetAsString(const std::string& key, std::string* out_value) const;
private:
// Helper to return a value.
Value* GetValue(const std::string& key) const;
// Helper to release Value of the key
void ReleaseValue(const std::string& key);
typedef std::map<std::string, Value*> ValueMap;
ValueMap value_map_;
DISALLOW_COPY_AND_ASSIGN(MediaFormat);
};
} // namespace media
#endif // MEDIA_BASE_MEDIA_FORMAT_H_
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