0bade0df3b
WebRTC no longer has any restriction on what thread frames should be delivered on. One possible problem with this CL is that NV21->I420 conversion and scaling is done on the thread that delivers frames, which might cause fps regressions. R=nisse@webrtc.org, perkj@webrtc.org, tkchin@webrtc.org Review URL: https://codereview.webrtc.org/2137503003 . Cr-Commit-Position: refs/heads/master@{#14021}
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_TIMESTAMPALIGNER_H_
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#define WEBRTC_BASE_TIMESTAMPALIGNER_H_
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#include "webrtc/base/basictypes.h"
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/optional.h"
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namespace rtc {
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// This class is not thread safe, so all calls to it must be synchronized
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// externally.
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class TimestampAligner {
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public:
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TimestampAligner();
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~TimestampAligner();
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public:
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// Update the estimated offset between camera time and system monotonic time.
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int64_t UpdateOffset(int64_t camera_time_us, int64_t system_time_us);
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int64_t ClipTimestamp(int64_t filtered_time_us, int64_t system_time_us);
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private:
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// State for the timestamp translation.
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int frames_seen_;
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// Estimated offset between camera time and system monotonic time.
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int64_t offset_us_;
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// State for timestamp clipping, applied after the filter, to ensure
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// that translated timestamps are monotonic and not in the future.
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// Subtracted from the translated timestamps.
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int64_t clip_bias_us_;
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rtc::Optional<int64_t> prev_translated_time_us_;
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RTC_DISALLOW_COPY_AND_ASSIGN(TimestampAligner);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_TIMESTAMPALIGNER_H_
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