/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
#ifndef __DRM_ENGINE_BASE_H__
#define __DRM_ENGINE_BASE_H__
#include <drm/drm_framework_common.h>
#include "IDrmEngine.h"
namespace android {
/**
* This class is an interface for plug-in developers
*
* Responsibility of this class is control the sequence of actual plug-in.
* All each plug-in developer has to do is implement onXXX() type virtual interfaces.
*/
class DrmEngineBase : public IDrmEngine {
public:
DrmEngineBase();
virtual ~DrmEngineBase();
public:
DrmConstraints* getConstraints(int uniqueId, const String8* path, int action);
DrmMetadata* getMetadata(int uniqueId, const String8* path);
status_t initialize(int uniqueId);
status_t setOnInfoListener(int uniqueId, const IDrmEngine::OnInfoListener* infoListener);
status_t terminate(int uniqueId);
bool canHandle(int uniqueId, const String8& path);
DrmInfoStatus* processDrmInfo(int uniqueId, const DrmInfo* drmInfo);
status_t saveRights(int uniqueId, const DrmRights& drmRights,
const String8& rightsPath, const String8& contentPath);
DrmInfo* acquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInfoRequest);
String8 getOriginalMimeType(int uniqueId, const String8& path, int fd);
int getDrmObjectType(int uniqueId, const String8& path, const String8& mimeType);
int checkRightsStatus(int uniqueId, const String8& path, int action);
status_t consumeRights(int uniqueId, DecryptHandle* decryptHandle, int action, bool reserve);
status_t setPlaybackStatus(
int uniqueId, DecryptHandle* decryptHandle, int playbackStatus, int64_t position);
bool validateAction(
int uniqueId, const String8& path, int action, const ActionDescription& description);
status_t removeRights(int uniqueId, const String8& path);
status_t removeAllRights(int uniqueId);
status_t openConvertSession(int uniqueId, int convertId);
DrmConvertedStatus* convertData(int uniqueId, int convertId, const DrmBuffer* inputData);
DrmConvertedStatus* closeConvertSession(int uniqueId, int convertId);
DrmSupportInfo* getSupportInfo(int uniqueId);
status_t openDecryptSession(
int uniqueId, DecryptHandle* decryptHandle,
int fd, off64_t offset, off64_t length, const char* mime);
status_t openDecryptSession(
int uniqueId, DecryptHandle* decryptHandle,
const char* uri, const char* mime);
status_t openDecryptSession(int uniqueId, DecryptHandle* decryptHandle,
const DrmBuffer& buf, const String8& mimeType);
status_t closeDecryptSession(int uniqueId, DecryptHandle* decryptHandle);
status_t initializeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle,
int decryptUnitId, const DrmBuffer* headerInfo);
status_t decrypt(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId,
const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV);
status_t finalizeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId);
ssize_t pread(int uniqueId, DecryptHandle* decryptHandle,
void* buffer, ssize_t numBytes, off64_t offset);
protected:
/////////////////////////////////////////////////////
// Interface for plug-in developers //
// each plug-in has to implement following method //
/////////////////////////////////////////////////////
/**
* Get constraint information associated with input content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @param[in] action Actions defined such as,
* Action::DEFAULT, Action::PLAY, etc
* @return DrmConstraints
* key-value pairs of constraint are embedded in it
* @note
* In case of error, return NULL
*/
virtual DrmConstraints* onGetConstraints(
int uniqueId, const String8* path, int action) = 0;
/**
* Get metadata information associated with input content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @return DrmMetadata
* key-value pairs of metadata
* @note
* In case of error, return NULL
*/
virtual DrmMetadata* onGetMetadata(int uniqueId, const String8* path) = 0;
/**
* Initialize plug-in
*
* @param[in] uniqueId Unique identifier for a session
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onInitialize(int uniqueId) = 0;
/**
* Register a callback to be invoked when the caller required to
* receive necessary information
*
* @param[in] uniqueId Unique identifier for a session. uniqueId is a random
* number generated in the DRM service. If the DrmManagerClient
* is created in native code, uniqueId will be a number ranged
* from 0x1000 to 0x1fff. If it comes from Java code, the uniqueId
* will be a number ranged from 0x00 to 0xfff. So bit 0x1000 in
* uniqueId could be used in DRM plugins to differentiate native
* OnInfoListener and Java OnInfoListener.
* @param[in] infoListener Listener
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onSetOnInfoListener(
int uniqueId, const IDrmEngine::OnInfoListener* infoListener) = 0;
/**
* Terminate the plug-in
* and release resource bound to plug-in
*
* @param[in] uniqueId Unique identifier for a session
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onTerminate(int uniqueId) = 0;
/**
* Get whether the given content can be handled by this plugin or not
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path the protected object
* @return bool
* Returns true if this plugin can handle , false in case of not able to handle
*/
virtual bool onCanHandle(int uniqueId, const String8& path) = 0;
/**
* Executes given drm information based on its type
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] drmInfo Information needs to be processed
* @return DrmInfoStatus
* instance as a result of processing given input
*/
virtual DrmInfoStatus* onProcessDrmInfo(int uniqueId, const DrmInfo* drmInfo) = 0;
/**
* Save DRM rights to specified rights path
* and make association with content path
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] drmRights DrmRights to be saved
* @param[in] rightsPath File path where rights to be saved
* @param[in] contentPath File path where content was saved
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onSaveRights(int uniqueId, const DrmRights& drmRights,
const String8& rightspath, const String8& contentPath) = 0;
/**
* Retrieves necessary information for registration, unregistration or rights
* acquisition information.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] drmInfoRequest Request information to retrieve drmInfo
* @return DrmInfo
* instance as a result of processing given input
*/
virtual DrmInfo* onAcquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInforequest) = 0;
/**
* Retrieves the mime type embedded inside the original content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @param[in] fd descriptor of the protected content as a file source
* @return String8
* Returns mime-type of the original content, such as "video/mpeg"
*/
virtual String8 onGetOriginalMimeType(int uniqueId, const String8& path, int fd) = 0;
/**
* Retrieves the type of the protected object (content, rights, etc..)
* using specified path or mimetype. At least one parameter should be non null
* to retrieve DRM object type
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the content or null.
* @param[in] mimeType Mime type of the content or null.
* @return type of the DRM content,
* such as DrmObjectType::CONTENT, DrmObjectType::RIGHTS_OBJECT
*/
virtual int onGetDrmObjectType(
int uniqueId, const String8& path, const String8& mimeType) = 0;
/**
* Check whether the given content has valid rights or not
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @param[in] action Action to perform (Action::DEFAULT, Action::PLAY, etc)
* @return the status of the rights for the protected content,
* such as RightsStatus::RIGHTS_VALID, RightsStatus::RIGHTS_EXPIRED, etc.
*/
virtual int onCheckRightsStatus(int uniqueId, const String8& path, int action) = 0;
/**
* Consumes the rights for a content.
* If the reserve parameter is true the rights is reserved until the same
* application calls this api again with the reserve parameter set to false.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the decryption session
* @param[in] action Action to perform. (Action::DEFAULT, Action::PLAY, etc)
* @param[in] reserve True if the rights should be reserved.
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onConsumeRights(int uniqueId, DecryptHandle* decryptHandle,
int action, bool reserve) = 0;
/**
* Informs the DRM Engine about the playback actions performed on the DRM files.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the decryption session
* @param[in] playbackStatus Playback action (Playback::START, Playback::STOP, Playback::PAUSE)
* @param[in] position Position in the file (in milliseconds) where the start occurs.
* Only valid together with Playback::START.
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onSetPlaybackStatus(
int uniqueId, DecryptHandle* decryptHandle, int playbackStatus, int64_t position) = 0;
/**
* Validates whether an action on the DRM content is allowed or not.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @param[in] action Action to validate (Action::PLAY, Action::TRANSFER, etc)
* @param[in] description Detailed description of the action
* @return true if the action is allowed.
*/
virtual bool onValidateAction(int uniqueId, const String8& path,
int action, const ActionDescription& description) = 0;
/**
* Removes the rights associated with the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] path Path of the protected content
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onRemoveRights(int uniqueId, const String8& path) = 0;
/**
* Removes all the rights information of each plug-in associated with
* DRM framework. Will be used in master reset
*
* @param[in] uniqueId Unique identifier for a session
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onRemoveAllRights(int uniqueId) = 0;
/**
* This API is for Forward Lock based DRM scheme.
* Each time the application tries to download a new DRM file
* which needs to be converted, then the application has to
* begin with calling this API.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] convertId Handle for the convert session
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onOpenConvertSession(int uniqueId, int convertId) = 0;
/**
* Accepts and converts the input data which is part of DRM file.
* The resultant converted data and the status is returned in the DrmConvertedInfo
* object. This method will be called each time there are new block
* of data received by the application.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] convertId Handle for the convert session
* @param[in] inputData Input Data which need to be converted
* @return Return object contains the status of the data conversion,
* the output converted data and offset. In this case the
* application will ignore the offset information.
*/
virtual DrmConvertedStatus* onConvertData(
int uniqueId, int convertId, const DrmBuffer* inputData) = 0;
/**
* Informs the Drm Agent when there is no more data which need to be converted
* or when an error occurs. Upon successful conversion of the complete data,
* the agent will inform that where the header and body signature
* should be added. This signature appending is needed to integrity
* protect the converted file.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] convertId Handle for the convert session
* @return Return object contains the status of the data conversion,
* the header and body signature data. It also informs
* the application on which offset these signature data
* should be appended.
*/
virtual DrmConvertedStatus* onCloseConvertSession(int uniqueId, int convertId) = 0;
/**
* Returns the information about the Drm Engine capabilities which includes
* supported MimeTypes and file suffixes.
*
* @param[in] uniqueId Unique identifier for a session
* @return DrmSupportInfo
* instance which holds the capabilities of a plug-in
*/
virtual DrmSupportInfo* onGetSupportInfo(int uniqueId) = 0;
/**
* Open the decrypt session to decrypt the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the current decryption session
* @param[in] fd File descriptor of the protected content to be decrypted
* @param[in] offset Start position of the content
* @param[in] length The length of the protected content
* @return
* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
*/
virtual status_t onOpenDecryptSession(
int uniqueId, DecryptHandle* decryptHandle,
int fd, off64_t offset, off64_t length) = 0;
/**
* Open the decrypt session to decrypt the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the current decryption session
* @param[in] fd File descriptor of the protected content to be decrypted
* @param[in] offset Start position of the content
* @param[in] length The length of the protected content
* @param[in] mime Mime type of the protected content
* drm plugin may do some optimization since the mime type is known.
* @return
* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
*/
virtual status_t onOpenDecryptSession(
int /* uniqueId */, DecryptHandle* /* decryptHandle */,
int /* fd */, off64_t /* offset */, off64_t /* length */,
const char* /* mime */) {
return DRM_ERROR_CANNOT_HANDLE;
}
/**
* Open the decrypt session to decrypt the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the current decryption session
* @param[in] uri Path of the protected content to be decrypted
* @return
* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
*/
virtual status_t onOpenDecryptSession(
int uniqueId, DecryptHandle* decryptHandle,
const char* uri) = 0;
/**
* Open the decrypt session to decrypt the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the current decryption session
* @param[in] uri Path of the protected content to be decrypted
* @param[in] mime Mime type of the protected content. The corresponding
* drm plugin may do some optimization since the mime type is known.
* @return
* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
*/
virtual status_t onOpenDecryptSession(
int /* uniqueId */, DecryptHandle* /* decryptHandle */,
const char* /* uri */, const char* /* mime */) {
return DRM_ERROR_CANNOT_HANDLE;
}
/**
* Open the decrypt session to decrypt the given protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the current decryption session
* @param[in] buf Data to initiate decrypt session
* @param[in] mimeType Mime type of the protected content
* @return
* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
*/
virtual status_t onOpenDecryptSession(int /* uniqueId */,
DecryptHandle* /* decryptHandle */,
const DrmBuffer& /* buf */,
const String8& /* mimeType */) {
return DRM_ERROR_CANNOT_HANDLE;
}
/**
* Close the decrypt session for the given handle
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the decryption session
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onCloseDecryptSession(int uniqueId, DecryptHandle* decryptHandle) = 0;
/**
* Initialize decryption for the given unit of the protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptId Handle for the decryption session
* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
* @param[in] headerInfo Information for initializing decryption of this decrypUnit
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onInitializeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle,
int decryptUnitId, const DrmBuffer* headerInfo) = 0;
/**
* Decrypt the protected content buffers for the given unit
* This method will be called any number of times, based on number of
* encrypted streams received from application.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptId Handle for the decryption session
* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
* @param[in] encBuffer Encrypted data block
* @param[out] decBuffer Decrypted data block
* @param[in] IV Optional buffer
* @return status_t
* Returns the error code for this API
* DRM_NO_ERROR for success, and one of DRM_ERROR_UNKNOWN, DRM_ERROR_LICENSE_EXPIRED
* DRM_ERROR_SESSION_NOT_OPENED, DRM_ERROR_DECRYPT_UNIT_NOT_INITIALIZED,
* DRM_ERROR_DECRYPT for failure.
*/
virtual status_t onDecrypt(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId,
const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV) = 0;
/**
* Finalize decryption for the given unit of the protected content
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the decryption session
* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
* @return status_t
* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
*/
virtual status_t onFinalizeDecryptUnit(
int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId) = 0;
/**
* Reads the specified number of bytes from an open DRM file.
*
* @param[in] uniqueId Unique identifier for a session
* @param[in] decryptHandle Handle for the decryption session
* @param[out] buffer Reference to the buffer that should receive the read data.
* @param[in] numBytes Number of bytes to read.
* @param[in] offset Offset with which to update the file position.
*
* @return Number of bytes read. Returns -1 for Failure.
*/
virtual ssize_t onPread(int uniqueId, DecryptHandle* decryptHandle,
void* buffer, ssize_t numBytes, off64_t offset) = 0;
};
};
#endif /* __DRM_ENGINE_BASE_H__ */