Clean up mediadrm dependencies

Move various things around so mediadrmserver doesn't need
libstagefright and libmedia

Test: build/boot
Change-Id: I48b713cd679b992cb6ad1262c20394a9892d7027
diff --git a/media/utils/Android.mk b/media/utils/Android.mk
index f482d1a..21d1b5b 100644
--- a/media/utils/Android.mk
+++ b/media/utils/Android.mk
@@ -20,6 +20,7 @@
   BatteryNotifier.cpp \
   ISchedulingPolicyService.cpp \
   MemoryLeakTrackUtil.cpp \
+  ProcessInfo.cpp \
   SchedulingPolicyService.cpp
 
 LOCAL_SHARED_LIBRARIES := \
diff --git a/media/utils/ProcessInfo.cpp b/media/utils/ProcessInfo.cpp
new file mode 100644
index 0000000..27f1a79
--- /dev/null
+++ b/media/utils/ProcessInfo.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "ProcessInfo"
+#include <utils/Log.h>
+
+#include <media/stagefright/ProcessInfo.h>
+
+#include <binder/IPCThreadState.h>
+#include <binder/IProcessInfoService.h>
+#include <binder/IServiceManager.h>
+
+namespace android {
+
+ProcessInfo::ProcessInfo() {}
+
+bool ProcessInfo::getPriority(int pid, int* priority) {
+    sp<IBinder> binder = defaultServiceManager()->getService(String16("processinfo"));
+    sp<IProcessInfoService> service = interface_cast<IProcessInfoService>(binder);
+
+    size_t length = 1;
+    int32_t state;
+    static const int32_t INVALID_ADJ = -10000;
+    static const int32_t NATIVE_ADJ = -1000;
+    int32_t score = INVALID_ADJ;
+    status_t err = service->getProcessStatesAndOomScoresFromPids(length, &pid, &state, &score);
+    if (err != OK) {
+        ALOGE("getProcessStatesAndOomScoresFromPids failed");
+        return false;
+    }
+    ALOGV("pid %d state %d score %d", pid, state, score);
+    if (score <= NATIVE_ADJ) {
+        ALOGE("pid %d invalid OOM adjustments value %d", pid, score);
+        return false;
+    }
+
+    // Use OOM adjustments value as the priority. Lower the value, higher the priority.
+    *priority = score;
+    return true;
+}
+
+bool ProcessInfo::isValidPid(int pid) {
+    int callingPid = IPCThreadState::self()->getCallingPid();
+    // Trust it if this is called from the same process otherwise pid has to match the calling pid.
+    return (callingPid == getpid()) || (callingPid == pid);
+}
+
+ProcessInfo::~ProcessInfo() {}
+
+}  // namespace android