1 files changed, 57 insertions, 0 deletions
diff --git a/webrtc/modules/video_coding/codec_timer.h b/webrtc/modules/video_coding/codec_timer.h
new file mode 100644
index 0000000000..8ebd82ab9c
--- /dev/null
+++ b/webrtc/modules/video_coding/codec_timer.h
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
+
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+// MAX_HISTORY_SIZE * SHORT_FILTER_MS defines the window size in milliseconds
+#define MAX_HISTORY_SIZE 10
+#define SHORT_FILTER_MS 1000
+
+class VCMShortMaxSample {
+ public:
+  VCMShortMaxSample() : shortMax(0), timeMs(-1) {}
+
+  int32_t shortMax;
+  int64_t timeMs;
+};
+
+class VCMCodecTimer {
+ public:
+  VCMCodecTimer();
+
+  // Updates the max filtered decode time.
+  void MaxFilter(int32_t newDecodeTimeMs, int64_t nowMs);
+
+  // Empty the list of timers.
+  void Reset();
+
+  // Get the required decode time in ms.
+  int32_t RequiredDecodeTimeMs(FrameType frameType) const;
+
+ private:
+  void UpdateMaxHistory(int32_t decodeTime, int64_t now);
+  void ProcessHistory(int64_t nowMs);
+
+  int32_t _filteredMax;
+  // The number of samples ignored so far.
+  int32_t _ignoredSampleCount;
+  int32_t _shortMax;
+  VCMShortMaxSample _history[MAX_HISTORY_SIZE];
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_