1 files changed, 57 insertions, 0 deletions
diff --git a/libs/common_time/common_clock.h b/libs/common_time/common_clock.h
new file mode 100644
index 0000000..b786fdc
--- /dev/null
+++ b/libs/common_time/common_clock.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2012 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 __COMMON_CLOCK_H__
+#define __COMMON_CLOCK_H__
+
+#include <stdint.h>
+
+#include <utils/Errors.h>
+#include <utils/LinearTransform.h>
+#include <utils/threads.h>
+
+namespace android {
+
+class CommonClock {
+  public:
+    CommonClock();
+
+    bool      init(uint64_t local_freq);
+
+    status_t  localToCommon(int64_t local, int64_t *common_out) const;
+    status_t  commonToLocal(int64_t common, int64_t *local_out) const;
+    int64_t   localDurationToCommonDuration(int64_t localDur) const;
+    uint64_t  getCommonFreq() const { return kCommonFreq; }
+    bool      isValid() const { return cur_trans_valid_; }
+    status_t  setSlew(int64_t change_time, int32_t ppm);
+    void      setBasis(int64_t local, int64_t common);
+    void      resetBasis();
+  private:
+    mutable Mutex lock_;
+
+    int32_t  cur_slew_;
+    uint32_t local_to_common_freq_numer_;
+    uint32_t local_to_common_freq_denom_;
+
+    LinearTransform duration_trans_;
+    LinearTransform cur_trans_;
+    bool cur_trans_valid_;
+
+    static const uint64_t kCommonFreq = 1000000ull;
+};
+
+}  // namespace android
+#endif  // __COMMON_CLOCK_H__