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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 MEDIA_BASE_CDM_CONTEXT_H_
#define MEDIA_BASE_CDM_CONTEXT_H_
#include "base/callback.h"
#include "base/macros.h"
#include "media/base/media_export.h"
namespace media {
class Decryptor;
// An interface representing the context that a media pipeline needs from a
// content decryption module (CDM) to decrypt (and decode) encrypted buffers.
// Only used for implementing SetCdm().
class MEDIA_EXPORT CdmContext {
public:
// Indicates an invalid CDM ID. See GetCdmId() for details.
static const int kInvalidCdmId = 0;
virtual ~CdmContext();
// Gets the Decryptor object associated with the CDM. Returns nullptr if the
// CDM does not support a Decryptor. Must not return nullptr if GetCdmId()
// returns kInvalidCdmId. The returned object is only guaranteed to be valid
// during the CDM's lifetime.
virtual Decryptor* GetDecryptor() = 0;
// Returns an ID that identifies a CDM, or kInvalidCdmId. The interpretation
// is implementation-specific; current implementations use the ID to locate a
// remote CDM in a different process. The return value will not be
// kInvalidCdmId if GetDecryptor() returns nullptr.
virtual int GetCdmId() const = 0;
protected:
CdmContext();
private:
DISALLOW_COPY_AND_ASSIGN(CdmContext);
};
// An interface for looking up CdmContext objects by the CDM ID.
class MEDIA_EXPORT CdmContextProvider {
public:
virtual ~CdmContextProvider();
// Returns the CdmContext corresponding to |cdm_id|. Returns nullptr if no
// such CdmContext can be found.
// Note: Calling GetCdmId() on the returned CdmContext returns kInvalidCdmId
// (in all current cases) because the CDM will be local in the process where
// GetCdmContext() is called.
virtual CdmContext* GetCdmContext(int cdm_id) = 0;
protected:
CdmContextProvider();
private:
DISALLOW_COPY_AND_ASSIGN(CdmContextProvider);
};
// Callback to notify that the CdmContext has been completely attached to
// the media pipeline. Parameter indicates whether the operation succeeded.
typedef base::Callback<void(bool)> CdmAttachedCB;
// A dummy implementation of CdmAttachedCB.
MEDIA_EXPORT void IgnoreCdmAttached(bool success);
} // namespace media
#endif // MEDIA_BASE_CDM_CONTEXT_H_
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