d8dbdf7ead
This is a common time service used by Tungsten for synchronizing
distributed playback.
This is a squashed merge from master-tungsten of the following changes:
commit 43be3231034ff8537fdd84422a7954780038671f
Author: John Grossman <johngro@google.com>
Date: Mon Jun 27 18:59:12 2011 -0700
Move libaah_rtp over from the vendor directory.
Also move factor PipeEvent out into utils.
Change-Id: Id3877c66efe22d771cf3ef4877107e431b828e37
commit a148e2674b1d3cb73289b82b85c333f0a66824a9
Author: John Grossman <johngro@google.com>
Date: Mon Jun 20 17:02:24 2011 -0700
Move the A@H time service into frameworks/base
Change-Id: I5c570cde70e8931e205516cb33517585804ce841
commit 86c94c7d6780fcfa4e1146325706fb78bc30544c
Author: Jason Simmons <jsimmons@google.com>
Date: Mon Jun 20 15:44:31 2011 -0700
Update the service manager UID table to match the new name of the common clock service
Change-Id: I5a65e84e8dff743c69d182e9851e58fc68791564
commit 6ab14c34be8c1b10b1258bdebbba1e52743ff5b9
Author: Jason Simmons <jsimmons@google.com>
Date: Fri Jun 3 18:19:40 2011 -0700
Add tungsten_timesrv to init.rc
Change-Id: I851aa990612440e1df1af992ed6e4d64b54a4951
Change-Id: Id832a0a00d447aa562bb7476902799bfa5bbda8d
Signed-off-by: Mike J. Chen <mjchen@google.com>
Signed-off-by: John Grossman <johngro@google.com>
122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CLOCK_RECOVERY_H__
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#define __CLOCK_RECOVERY_H__
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#include <stdint.h>
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#include <utils/LinearTransform.h>
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#include <utils/threads.h>
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#ifdef AAH_TSDEBUG
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#include "diag_thread.h"
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#endif
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namespace android {
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class CommonClock;
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class LocalClock;
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class ClockRecoveryLoop {
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public:
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ClockRecoveryLoop(LocalClock* local_clock, CommonClock* common_clock);
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~ClockRecoveryLoop();
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void reset(bool position, bool frequency);
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bool pushDisciplineEvent(int64_t local_time,
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int64_t nominal_common_time,
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int64_t data_point_rtt);
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private:
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typedef struct {
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// Limits for the correction factor supplied to set_counter_slew_rate.
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// The controller will always clamp its output to the range expressed by
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// correction_(min|max)
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int32_t correction_min;
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int32_t correction_max;
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// Limits for the internal integration accumulator in the PID
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// controller. The value of the accumulator is scaled by gain_I to
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// produce the integral component of the PID controller output.
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// Platforms can use these limits to prevent windup in the system
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// if/when the correction factor needs to be driven to saturation for
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// extended periods of time.
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int32_t integrated_delta_min;
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int32_t integrated_delta_max;
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// Gain for the P, I and D components of the controller.
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LinearTransform gain_P;
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LinearTransform gain_I;
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LinearTransform gain_D;
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} PIDParams;
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typedef struct {
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int64_t local_time;
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int64_t observed_common_time;
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int64_t nominal_common_time;
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int64_t rtt;
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bool point_used;
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} DisciplineDataPoint;
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static uint32_t findMinRTTNdx(DisciplineDataPoint* data, uint32_t count);
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void computePIDParams();
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void reset_l(bool position, bool frequency);
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static int32_t doGainScale(const LinearTransform& gain, int32_t val);
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void applySlew();
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// The local clock HW abstraction we use as the basis for common time.
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LocalClock* local_clock_;
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bool local_clock_can_slew_;
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// The common clock we end up controlling along with the lock used to
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// serialize operations.
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CommonClock* common_clock_;
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Mutex lock_;
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// The parameters computed to be used for the PID Controller.
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PIDParams pid_params_;
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// The maximum allowed error (as indicated by a pushDisciplineEvent) before
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// we panic.
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int32_t panic_thresh_;
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// parameters maintained while running and reset during a reset
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// of the frequency correction.
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bool last_delta_valid_;
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int32_t last_delta_;
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int32_t integrated_error_;
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int32_t correction_cur_;
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// State kept for filtering the discipline data.
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static const uint32_t kFilterSize = 6;
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DisciplineDataPoint filter_data_[kFilterSize];
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uint32_t filter_wr_;
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bool filter_full_;
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static const uint32_t kStartupFilterSize = 4;
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DisciplineDataPoint startup_filter_data_[kStartupFilterSize];
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uint32_t startup_filter_wr_;
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#ifdef AAH_TSDEBUG
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sp<DiagThread> diag_thread_;
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#endif
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};
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} // namespace android
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#endif // __CLOCK_RECOVERY_H__
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