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/*
* 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.
*/
#define __STDC_LIMIT_MACROS
#define LOG_TAG "common_time"
#include <utils/Log.h>
#include <stdint.h>
#include <utils/Errors.h>
#include <utils/LinearTransform.h>
#include "common_clock.h"
namespace android {
CommonClock::CommonClock() {
cur_slew_ = 0;
cur_trans_valid_ = false;
cur_trans_.a_zero = 0;
cur_trans_.b_zero = 0;
cur_trans_.a_to_b_numer = local_to_common_freq_numer_ = 1;
cur_trans_.a_to_b_denom = local_to_common_freq_denom_ = 1;
duration_trans_ = cur_trans_;
}
bool CommonClock::init(uint64_t local_freq) {
Mutex::Autolock lock(&lock_);
if (!local_freq)
return false;
uint64_t numer = kCommonFreq;
uint64_t denom = local_freq;
LinearTransform::reduce(&numer, &denom);
if ((numer > UINT32_MAX) || (denom > UINT32_MAX)) {
ALOGE("Overflow in CommonClock::init while trying to reduce %lld/%lld",
kCommonFreq, local_freq);
return false;
}
cur_trans_.a_to_b_numer = local_to_common_freq_numer_ =
static_cast<uint32_t>(numer);
cur_trans_.a_to_b_denom = local_to_common_freq_denom_ =
static_cast<uint32_t>(denom);
duration_trans_ = cur_trans_;
return true;
}
status_t CommonClock::localToCommon(int64_t local, int64_t *common_out) const {
Mutex::Autolock lock(&lock_);
if (!cur_trans_valid_)
return INVALID_OPERATION;
if (!cur_trans_.doForwardTransform(local, common_out))
return INVALID_OPERATION;
return OK;
}
status_t CommonClock::commonToLocal(int64_t common, int64_t *local_out) const {
Mutex::Autolock lock(&lock_);
if (!cur_trans_valid_)
return INVALID_OPERATION;
if (!cur_trans_.doReverseTransform(common, local_out))
return INVALID_OPERATION;
return OK;
}
int64_t CommonClock::localDurationToCommonDuration(int64_t localDur) const {
int64_t ret;
duration_trans_.doForwardTransform(localDur, &ret);
return ret;
}
void CommonClock::setBasis(int64_t local, int64_t common) {
Mutex::Autolock lock(&lock_);
cur_trans_.a_zero = local;
cur_trans_.b_zero = common;
cur_trans_valid_ = true;
}
void CommonClock::resetBasis() {
Mutex::Autolock lock(&lock_);
cur_trans_.a_zero = 0;
cur_trans_.b_zero = 0;
cur_trans_valid_ = false;
}
status_t CommonClock::setSlew(int64_t change_time, int32_t ppm) {
Mutex::Autolock lock(&lock_);
int64_t new_local_basis;
int64_t new_common_basis;
if (cur_trans_valid_) {
new_local_basis = change_time;
if (!cur_trans_.doForwardTransform(change_time, &new_common_basis)) {
ALOGE("Overflow when attempting to set slew rate to %d", ppm);
return INVALID_OPERATION;
}
} else {
new_local_basis = 0;
new_common_basis = 0;
}
cur_slew_ = ppm;
uint32_t n1 = local_to_common_freq_numer_;
uint32_t n2 = 1000000 + cur_slew_;
uint32_t d1 = local_to_common_freq_denom_;
uint32_t d2 = 1000000;
// n1/d1 has already been reduced, no need to do so here.
LinearTransform::reduce(&n1, &d2);
LinearTransform::reduce(&n2, &d1);
LinearTransform::reduce(&n2, &d2);
cur_trans_.a_zero = new_local_basis;
cur_trans_.b_zero = new_common_basis;
cur_trans_.a_to_b_numer = n1 * n2;
cur_trans_.a_to_b_denom = d1 * d2;
return OK;
}
} // namespace android
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