1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 //#define LOG_NDEBUG 0 18 #define LOG_TAG "DrmSessionManager" 19 #include <utils/Log.h> 20 21 #include <binder/IPCThreadState.h> 22 #include <binder/IProcessInfoService.h> 23 #include <binder/IServiceManager.h> 24 #include <media/DrmSessionManager.h> 25 #include <media/DrmSessionClientInterface.h> 26 #include <media/stagefright/ProcessInfo.h> 27 #include <unistd.h> 28 #include <utils/String8.h> 29 30 namespace android { 31 32 static String8 GetSessionIdString(const Vector<uint8_t> &sessionId) { 33 String8 sessionIdStr; 34 for (size_t i = 0; i < sessionId.size(); ++i) { 35 sessionIdStr.appendFormat("%u ", sessionId[i]); 36 } 37 return sessionIdStr; 38 } 39 40 bool isEqualSessionId(const Vector<uint8_t> &sessionId1, const Vector<uint8_t> &sessionId2) { 41 if (sessionId1.size() != sessionId2.size()) { 42 return false; 43 } 44 for (size_t i = 0; i < sessionId1.size(); ++i) { 45 if (sessionId1[i] != sessionId2[i]) { 46 return false; 47 } 48 } 49 return true; 50 } 51 52 sp<DrmSessionManager> DrmSessionManager::Instance() { 53 static sp<DrmSessionManager> drmSessionManager = new DrmSessionManager(); 54 return drmSessionManager; 55 } 56 57 DrmSessionManager::DrmSessionManager() 58 : mProcessInfo(new ProcessInfo()), 59 mTime(0) {} 60 61 DrmSessionManager::DrmSessionManager(sp<ProcessInfoInterface> processInfo) 62 : mProcessInfo(processInfo), 63 mTime(0) {} 64 65 DrmSessionManager::~DrmSessionManager() {} 66 67 void DrmSessionManager::addSession( 68 int pid, sp<DrmSessionClientInterface> drm, const Vector<uint8_t> &sessionId) { 69 ALOGV("addSession(pid %d, drm %p, sessionId %s)", pid, drm.get(), 70 GetSessionIdString(sessionId).string()); 71 72 Mutex::Autolock lock(mLock); 73 SessionInfo info; 74 info.drm = drm; 75 info.sessionId = sessionId; 76 info.timeStamp = getTime_l(); 77 ssize_t index = mSessionMap.indexOfKey(pid); 78 if (index < 0) { 79 // new pid 80 SessionInfos infosForPid; 81 infosForPid.push_back(info); 82 mSessionMap.add(pid, infosForPid); 83 } else { 84 mSessionMap.editValueAt(index).push_back(info); 85 } 86 } 87 88 void DrmSessionManager::useSession(const Vector<uint8_t> &sessionId) { 89 ALOGV("useSession(%s)", GetSessionIdString(sessionId).string()); 90 91 Mutex::Autolock lock(mLock); 92 for (size_t i = 0; i < mSessionMap.size(); ++i) { 93 SessionInfos& infos = mSessionMap.editValueAt(i); 94 for (size_t j = 0; j < infos.size(); ++j) { 95 SessionInfo& info = infos.editItemAt(j); 96 if (isEqualSessionId(sessionId, info.sessionId)) { 97 info.timeStamp = getTime_l(); 98 return; 99 } 100 } 101 } 102 } 103 104 void DrmSessionManager::removeSession(const Vector<uint8_t> &sessionId) { 105 ALOGV("removeSession(%s)", GetSessionIdString(sessionId).string()); 106 107 Mutex::Autolock lock(mLock); 108 for (size_t i = 0; i < mSessionMap.size(); ++i) { 109 SessionInfos& infos = mSessionMap.editValueAt(i); 110 for (size_t j = 0; j < infos.size(); ++j) { 111 if (isEqualSessionId(sessionId, infos[j].sessionId)) { 112 infos.removeAt(j); 113 return; 114 } 115 } 116 } 117 } 118 119 void DrmSessionManager::removeDrm(sp<DrmSessionClientInterface> drm) { 120 ALOGV("removeDrm(%p)", drm.get()); 121 122 Mutex::Autolock lock(mLock); 123 bool found = false; 124 for (size_t i = 0; i < mSessionMap.size(); ++i) { 125 SessionInfos& infos = mSessionMap.editValueAt(i); 126 for (size_t j = 0; j < infos.size();) { 127 if (infos[j].drm == drm) { 128 ALOGV("removed session (%s)", GetSessionIdString(infos[j].sessionId).string()); 129 j = infos.removeAt(j); 130 found = true; 131 } else { 132 ++j; 133 } 134 } 135 if (found) { 136 break; 137 } 138 } 139 } 140 141 bool DrmSessionManager::reclaimSession(int callingPid) { 142 ALOGV("reclaimSession(%d)", callingPid); 143 144 sp<DrmSessionClientInterface> drm; 145 Vector<uint8_t> sessionId; 146 int lowestPriorityPid; 147 int lowestPriority; 148 { 149 Mutex::Autolock lock(mLock); 150 int callingPriority; 151 if (!mProcessInfo->getPriority(callingPid, &callingPriority)) { 152 return false; 153 } 154 if (!getLowestPriority_l(&lowestPriorityPid, &lowestPriority)) { 155 return false; 156 } 157 if (lowestPriority <= callingPriority) { 158 return false; 159 } 160 161 if (!getLeastUsedSession_l(lowestPriorityPid, &drm, &sessionId)) { 162 return false; 163 } 164 } 165 166 if (drm == NULL) { 167 return false; 168 } 169 170 ALOGV("reclaim session(%s) opened by pid %d", 171 GetSessionIdString(sessionId).string(), lowestPriorityPid); 172 173 return drm->reclaimSession(sessionId); 174 } 175 176 int64_t DrmSessionManager::getTime_l() { 177 return mTime++; 178 } 179 180 bool DrmSessionManager::getLowestPriority_l(int* lowestPriorityPid, int* lowestPriority) { 181 int pid = -1; 182 int priority = -1; 183 for (size_t i = 0; i < mSessionMap.size(); ++i) { 184 if (mSessionMap.valueAt(i).size() == 0) { 185 // no opened session by this process. 186 continue; 187 } 188 int tempPid = mSessionMap.keyAt(i); 189 int tempPriority; 190 if (!mProcessInfo->getPriority(tempPid, &tempPriority)) { 191 // shouldn't happen. 192 return false; 193 } 194 if (pid == -1) { 195 pid = tempPid; 196 priority = tempPriority; 197 } else { 198 if (tempPriority > priority) { 199 pid = tempPid; 200 priority = tempPriority; 201 } 202 } 203 } 204 if (pid != -1) { 205 *lowestPriorityPid = pid; 206 *lowestPriority = priority; 207 } 208 return (pid != -1); 209 } 210 211 bool DrmSessionManager::getLeastUsedSession_l( 212 int pid, sp<DrmSessionClientInterface>* drm, Vector<uint8_t>* sessionId) { 213 ssize_t index = mSessionMap.indexOfKey(pid); 214 if (index < 0) { 215 return false; 216 } 217 218 int leastUsedIndex = -1; 219 int64_t minTs = LLONG_MAX; 220 const SessionInfos& infos = mSessionMap.valueAt(index); 221 for (size_t j = 0; j < infos.size(); ++j) { 222 if (leastUsedIndex == -1) { 223 leastUsedIndex = j; 224 minTs = infos[j].timeStamp; 225 } else { 226 if (infos[j].timeStamp < minTs) { 227 leastUsedIndex = j; 228 minTs = infos[j].timeStamp; 229 } 230 } 231 } 232 if (leastUsedIndex != -1) { 233 *drm = infos[leastUsedIndex].drm; 234 *sessionId = infos[leastUsedIndex].sessionId; 235 } 236 return (leastUsedIndex != -1); 237 } 238 239 } // namespace android 240
