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533 lines
22 KiB
533 lines
22 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __DRM_ENGINE_BASE_H__
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#define __DRM_ENGINE_BASE_H__
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#include <drm/drm_framework_common.h>
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#include "IDrmEngine.h"
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namespace android {
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/**
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* This class is an interface for plug-in developers
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*
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* Responsibility of this class is control the sequence of actual plug-in.
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* All each plug-in developer has to do is implement onXXX() type virtual interfaces.
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*/
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class DrmEngineBase : public IDrmEngine {
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public:
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DrmEngineBase();
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virtual ~DrmEngineBase();
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public:
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DrmConstraints* getConstraints(int uniqueId, const String8* path, int action);
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DrmMetadata* getMetadata(int uniqueId, const String8* path);
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status_t initialize(int uniqueId);
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status_t setOnInfoListener(int uniqueId, const IDrmEngine::OnInfoListener* infoListener);
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status_t terminate(int uniqueId);
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bool canHandle(int uniqueId, const String8& path);
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DrmInfoStatus* processDrmInfo(int uniqueId, const DrmInfo* drmInfo);
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status_t saveRights(int uniqueId, const DrmRights& drmRights,
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const String8& rightsPath, const String8& contentPath);
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DrmInfo* acquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInfoRequest);
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String8 getOriginalMimeType(int uniqueId, const String8& path, int fd);
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int getDrmObjectType(int uniqueId, const String8& path, const String8& mimeType);
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int checkRightsStatus(int uniqueId, const String8& path, int action);
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status_t consumeRights(int uniqueId, sp<DecryptHandle>& decryptHandle, int action,
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bool reserve);
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status_t setPlaybackStatus(
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int uniqueId, sp<DecryptHandle>& decryptHandle, int playbackStatus, int64_t position);
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bool validateAction(
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int uniqueId, const String8& path, int action, const ActionDescription& description);
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status_t removeRights(int uniqueId, const String8& path);
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status_t removeAllRights(int uniqueId);
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status_t openConvertSession(int uniqueId, int convertId);
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DrmConvertedStatus* convertData(int uniqueId, int convertId, const DrmBuffer* inputData);
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DrmConvertedStatus* closeConvertSession(int uniqueId, int convertId);
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DrmSupportInfo* getSupportInfo(int uniqueId);
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status_t openDecryptSession(
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int uniqueId, sp<DecryptHandle>& decryptHandle,
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int fd, off64_t offset, off64_t length, const char* mime);
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status_t openDecryptSession(
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int uniqueId, sp<DecryptHandle>& decryptHandle,
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const char* uri, const char* mime);
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status_t openDecryptSession(int uniqueId, sp<DecryptHandle>& decryptHandle,
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const DrmBuffer& buf, const String8& mimeType);
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status_t closeDecryptSession(int uniqueId, sp<DecryptHandle>& decryptHandle);
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status_t initializeDecryptUnit(int uniqueId, sp<DecryptHandle>& decryptHandle,
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int decryptUnitId, const DrmBuffer* headerInfo);
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status_t decrypt(int uniqueId, sp<DecryptHandle>& decryptHandle, int decryptUnitId,
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const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV);
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status_t finalizeDecryptUnit(int uniqueId, sp<DecryptHandle>& decryptHandle,
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int decryptUnitId);
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ssize_t pread(int uniqueId, sp<DecryptHandle>& decryptHandle,
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void* buffer, ssize_t numBytes, off64_t offset);
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protected:
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/////////////////////////////////////////////////////
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// Interface for plug-in developers //
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// each plug-in has to implement following method //
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/////////////////////////////////////////////////////
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/**
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* Get constraint information associated with input content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @param[in] action Actions defined such as,
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* Action::DEFAULT, Action::PLAY, etc
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* @return DrmConstraints
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* key-value pairs of constraint are embedded in it
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* @note
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* In case of error, return NULL
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*/
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virtual DrmConstraints* onGetConstraints(
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int uniqueId, const String8* path, int action) = 0;
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/**
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* Get metadata information associated with input content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @return DrmMetadata
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* key-value pairs of metadata
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* @note
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* In case of error, return NULL
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*/
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virtual DrmMetadata* onGetMetadata(int uniqueId, const String8* path) = 0;
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/**
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* Initialize plug-in
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*
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* @param[in] uniqueId Unique identifier for a session
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onInitialize(int uniqueId) = 0;
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/**
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* Register a callback to be invoked when the caller required to
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* receive necessary information
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*
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* @param[in] uniqueId Unique identifier for a session. uniqueId is a random
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* number generated in the DRM service. If the DrmManagerClient
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* is created in native code, uniqueId will be a number ranged
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* from 0x1000 to 0x1fff. If it comes from Java code, the uniqueId
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* will be a number ranged from 0x00 to 0xfff. So bit 0x1000 in
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* uniqueId could be used in DRM plugins to differentiate native
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* OnInfoListener and Java OnInfoListener.
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* @param[in] infoListener Listener
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onSetOnInfoListener(
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int uniqueId, const IDrmEngine::OnInfoListener* infoListener) = 0;
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/**
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* Terminate the plug-in
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* and release resource bound to plug-in
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*
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* @param[in] uniqueId Unique identifier for a session
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onTerminate(int uniqueId) = 0;
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/**
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* Get whether the given content can be handled by this plugin or not
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path the protected object
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* @return bool
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* Returns true if this plugin can handle , false in case of not able to handle
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*/
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virtual bool onCanHandle(int uniqueId, const String8& path) = 0;
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/**
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* Executes given drm information based on its type
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] drmInfo Information needs to be processed
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* @return DrmInfoStatus
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* instance as a result of processing given input
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*/
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virtual DrmInfoStatus* onProcessDrmInfo(int uniqueId, const DrmInfo* drmInfo) = 0;
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/**
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* Save DRM rights to specified rights path
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* and make association with content path
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] drmRights DrmRights to be saved
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* @param[in] rightsPath File path where rights to be saved
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* @param[in] contentPath File path where content was saved
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onSaveRights(int uniqueId, const DrmRights& drmRights,
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const String8& rightspath, const String8& contentPath) = 0;
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/**
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* Retrieves necessary information for registration, unregistration or rights
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* acquisition information.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] drmInfoRequest Request information to retrieve drmInfo
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* @return DrmInfo
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* instance as a result of processing given input
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*/
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virtual DrmInfo* onAcquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInforequest) = 0;
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/**
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* Retrieves the mime type embedded inside the original content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @param[in] fd descriptor of the protected content as a file source
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* @return String8
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* Returns mime-type of the original content, such as "video/mpeg"
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*/
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virtual String8 onGetOriginalMimeType(int uniqueId, const String8& path, int fd) = 0;
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/**
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* Retrieves the type of the protected object (content, rights, etc..)
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* using specified path or mimetype. At least one parameter should be non null
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* to retrieve DRM object type
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the content or null.
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* @param[in] mimeType Mime type of the content or null.
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* @return type of the DRM content,
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* such as DrmObjectType::CONTENT, DrmObjectType::RIGHTS_OBJECT
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*/
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virtual int onGetDrmObjectType(
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int uniqueId, const String8& path, const String8& mimeType) = 0;
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/**
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* Check whether the given content has valid rights or not
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @param[in] action Action to perform (Action::DEFAULT, Action::PLAY, etc)
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* @return the status of the rights for the protected content,
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* such as RightsStatus::RIGHTS_VALID, RightsStatus::RIGHTS_EXPIRED, etc.
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*/
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virtual int onCheckRightsStatus(int uniqueId, const String8& path, int action) = 0;
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/**
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* Consumes the rights for a content.
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* If the reserve parameter is true the rights is reserved until the same
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* application calls this api again with the reserve parameter set to false.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the decryption session
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* @param[in] action Action to perform. (Action::DEFAULT, Action::PLAY, etc)
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* @param[in] reserve True if the rights should be reserved.
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onConsumeRights(int uniqueId, sp<DecryptHandle>& decryptHandle,
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int action, bool reserve) = 0;
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/**
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* Informs the DRM Engine about the playback actions performed on the DRM files.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the decryption session
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* @param[in] playbackStatus Playback action (Playback::START, Playback::STOP, Playback::PAUSE)
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* @param[in] position Position in the file (in milliseconds) where the start occurs.
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* Only valid together with Playback::START.
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onSetPlaybackStatus(
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int uniqueId, sp<DecryptHandle>& decryptHandle, int playbackStatus,
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int64_t position) = 0;
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/**
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* Validates whether an action on the DRM content is allowed or not.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @param[in] action Action to validate (Action::PLAY, Action::TRANSFER, etc)
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* @param[in] description Detailed description of the action
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* @return true if the action is allowed.
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*/
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virtual bool onValidateAction(int uniqueId, const String8& path,
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int action, const ActionDescription& description) = 0;
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/**
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* Removes the rights associated with the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] path Path of the protected content
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onRemoveRights(int uniqueId, const String8& path) = 0;
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/**
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* Removes all the rights information of each plug-in associated with
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* DRM framework.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onRemoveAllRights(int uniqueId) = 0;
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/**
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* This API is for Forward Lock based DRM scheme.
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* Each time the application tries to download a new DRM file
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* which needs to be converted, then the application has to
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* begin with calling this API.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] convertId Handle for the convert session
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onOpenConvertSession(int uniqueId, int convertId) = 0;
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/**
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* Accepts and converts the input data which is part of DRM file.
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* The resultant converted data and the status is returned in the DrmConvertedInfo
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* object. This method will be called each time there are new block
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* of data received by the application.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] convertId Handle for the convert session
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* @param[in] inputData Input Data which need to be converted
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* @return Return object contains the status of the data conversion,
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* the output converted data and offset. In this case the
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* application will ignore the offset information.
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*/
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virtual DrmConvertedStatus* onConvertData(
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int uniqueId, int convertId, const DrmBuffer* inputData) = 0;
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/**
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* Informs the Drm Agent when there is no more data which need to be converted
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* or when an error occurs. Upon successful conversion of the complete data,
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* the agent will inform that where the header and body signature
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* should be added. This signature appending is needed to integrity
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* protect the converted file.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] convertId Handle for the convert session
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* @return Return object contains the status of the data conversion,
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* the header and body signature data. It also informs
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* the application on which offset these signature data
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* should be appended.
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*/
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virtual DrmConvertedStatus* onCloseConvertSession(int uniqueId, int convertId) = 0;
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/**
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* Returns the information about the Drm Engine capabilities which includes
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* supported MimeTypes and file suffixes.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @return DrmSupportInfo
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* instance which holds the capabilities of a plug-in
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*/
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virtual DrmSupportInfo* onGetSupportInfo(int uniqueId) = 0;
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/**
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* Open the decrypt session to decrypt the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the current decryption session
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* @param[in] fd File descriptor of the protected content to be decrypted
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* @param[in] offset Start position of the content
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* @param[in] length The length of the protected content
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* @return
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* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
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*/
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virtual status_t onOpenDecryptSession(
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int uniqueId, sp<DecryptHandle>& decryptHandle,
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int fd, off64_t offset, off64_t length) = 0;
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/**
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* Open the decrypt session to decrypt the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the current decryption session
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* @param[in] fd File descriptor of the protected content to be decrypted
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* @param[in] offset Start position of the content
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* @param[in] length The length of the protected content
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* @param[in] mime Mime type of the protected content
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* drm plugin may do some optimization since the mime type is known.
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* @return
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* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
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*/
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virtual status_t onOpenDecryptSession(
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int /* uniqueId */, sp<DecryptHandle>& /* decryptHandle */,
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int /* fd */, off64_t /* offset */, off64_t /* length */,
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const char* /* mime */) {
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return DRM_ERROR_CANNOT_HANDLE;
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}
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/**
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* Open the decrypt session to decrypt the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the current decryption session
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* @param[in] uri Path of the protected content to be decrypted
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* @return
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* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
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*/
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virtual status_t onOpenDecryptSession(
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int uniqueId, sp<DecryptHandle>& decryptHandle,
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const char* uri) = 0;
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/**
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* Open the decrypt session to decrypt the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the current decryption session
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* @param[in] uri Path of the protected content to be decrypted
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* @param[in] mime Mime type of the protected content. The corresponding
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* drm plugin may do some optimization since the mime type is known.
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* @return
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* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
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*/
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virtual status_t onOpenDecryptSession(
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int /* uniqueId */, sp<DecryptHandle>& /* decryptHandle */,
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const char* /* uri */, const char* /* mime */) {
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return DRM_ERROR_CANNOT_HANDLE;
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}
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/**
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* Open the decrypt session to decrypt the given protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the current decryption session
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* @param[in] buf Data to initiate decrypt session
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* @param[in] mimeType Mime type of the protected content
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* @return
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* DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success
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*/
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virtual status_t onOpenDecryptSession(int /* uniqueId */,
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sp<DecryptHandle>& /* decryptHandle */,
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const DrmBuffer& /* buf */,
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const String8& /* mimeType */) {
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return DRM_ERROR_CANNOT_HANDLE;
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}
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/**
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* Close the decrypt session for the given handle
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the decryption session
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onCloseDecryptSession(int uniqueId, sp<DecryptHandle>& decryptHandle) = 0;
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/**
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* Initialize decryption for the given unit of the protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptId Handle for the decryption session
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* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
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* @param[in] headerInfo Information for initializing decryption of this decrypUnit
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onInitializeDecryptUnit(int uniqueId, sp<DecryptHandle>& decryptHandle,
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int decryptUnitId, const DrmBuffer* headerInfo) = 0;
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/**
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* Decrypt the protected content buffers for the given unit
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* This method will be called any number of times, based on number of
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* encrypted streams received from application.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptId Handle for the decryption session
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* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
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* @param[in] encBuffer Encrypted data block
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* @param[out] decBuffer Decrypted data block
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* @param[in] IV Optional buffer
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* @return status_t
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* Returns the error code for this API
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* DRM_NO_ERROR for success, and one of DRM_ERROR_UNKNOWN, DRM_ERROR_LICENSE_EXPIRED
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* DRM_ERROR_SESSION_NOT_OPENED, DRM_ERROR_DECRYPT_UNIT_NOT_INITIALIZED,
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* DRM_ERROR_DECRYPT for failure.
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*/
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virtual status_t onDecrypt(int uniqueId, sp<DecryptHandle>& decryptHandle, int decryptUnitId,
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const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV) = 0;
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/**
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* Finalize decryption for the given unit of the protected content
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the decryption session
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* @param[in] decryptUnitId ID Specifies decryption unit, such as track ID
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* @return status_t
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* Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure
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*/
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virtual status_t onFinalizeDecryptUnit(
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int uniqueId, sp<DecryptHandle>& decryptHandle, int decryptUnitId) = 0;
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/**
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* Reads the specified number of bytes from an open DRM file.
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*
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* @param[in] uniqueId Unique identifier for a session
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* @param[in] decryptHandle Handle for the decryption session
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* @param[out] buffer Reference to the buffer that should receive the read data.
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* @param[in] numBytes Number of bytes to read.
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* @param[in] offset Offset with which to update the file position.
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*
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* @return Number of bytes read. Returns -1 for Failure.
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*/
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virtual ssize_t onPread(int uniqueId, sp<DecryptHandle>& decryptHandle,
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void* buffer, ssize_t numBytes, off64_t offset) = 0;
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};
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};
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#endif /* __DRM_ENGINE_BASE_H__ */
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