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/*
* Copyright (C) 2015 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 LOG_NDEBUG 0
#define LOG_TAG "MediaClock"
#include <utils/Log.h>
#include <media/stagefright/MediaClock.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/ALooper.h>
namespace android {
MediaClock::MediaClock()
: mAnchorTimeMediaUs(-1),
mAnchorTimeRealUs(-1),
mMaxTimeMediaUs(INT64_MAX),
mStartingTimeMediaUs(-1),
mPlaybackRate(1.0) {
}
MediaClock::~MediaClock() {
}
void MediaClock::setStartingTimeMedia(int64_t startingTimeMediaUs) {
Mutex::Autolock autoLock(mLock);
mStartingTimeMediaUs = startingTimeMediaUs;
}
void MediaClock::clearAnchor() {
Mutex::Autolock autoLock(mLock);
mAnchorTimeMediaUs = -1;
mAnchorTimeRealUs = -1;
}
void MediaClock::updateAnchor(
int64_t anchorTimeMediaUs,
int64_t anchorTimeRealUs,
int64_t maxTimeMediaUs) {
if (anchorTimeMediaUs < 0 || anchorTimeRealUs < 0) {
ALOGW("reject anchor time since it is negative.");
return;
}
Mutex::Autolock autoLock(mLock);
int64_t nowUs = ALooper::GetNowUs();
int64_t nowMediaUs =
anchorTimeMediaUs + (nowUs - anchorTimeRealUs) * (double)mPlaybackRate;
if (nowMediaUs < 0) {
ALOGW("reject anchor time since it leads to negative media time.");
return;
}
mAnchorTimeRealUs = nowUs;
mAnchorTimeMediaUs = nowMediaUs;
mMaxTimeMediaUs = maxTimeMediaUs;
}
void MediaClock::updateMaxTimeMedia(int64_t maxTimeMediaUs) {
Mutex::Autolock autoLock(mLock);
mMaxTimeMediaUs = maxTimeMediaUs;
}
void MediaClock::setPlaybackRate(float rate) {
CHECK_GE(rate, 0.0);
Mutex::Autolock autoLock(mLock);
if (mAnchorTimeRealUs == -1) {
mPlaybackRate = rate;
return;
}
int64_t nowUs = ALooper::GetNowUs();
mAnchorTimeMediaUs += (nowUs - mAnchorTimeRealUs) * (double)mPlaybackRate;
if (mAnchorTimeMediaUs < 0) {
ALOGW("setRate: anchor time should not be negative, set to 0.");
mAnchorTimeMediaUs = 0;
}
mAnchorTimeRealUs = nowUs;
mPlaybackRate = rate;
}
float MediaClock::getPlaybackRate() const {
Mutex::Autolock autoLock(mLock);
return mPlaybackRate;
}
status_t MediaClock::getMediaTime(
int64_t realUs, int64_t *outMediaUs, bool allowPastMaxTime) const {
if (outMediaUs == NULL) {
return BAD_VALUE;
}
Mutex::Autolock autoLock(mLock);
return getMediaTime_l(realUs, outMediaUs, allowPastMaxTime);
}
status_t MediaClock::getMediaTime_l(
int64_t realUs, int64_t *outMediaUs, bool allowPastMaxTime) const {
if (mAnchorTimeRealUs == -1) {
return NO_INIT;
}
int64_t mediaUs = mAnchorTimeMediaUs
+ (realUs - mAnchorTimeRealUs) * (double)mPlaybackRate;
if (mediaUs > mMaxTimeMediaUs && !allowPastMaxTime) {
mediaUs = mMaxTimeMediaUs;
}
if (mediaUs < mStartingTimeMediaUs) {
mediaUs = mStartingTimeMediaUs;
}
if (mediaUs < 0) {
mediaUs = 0;
}
*outMediaUs = mediaUs;
return OK;
}
status_t MediaClock::getRealTimeFor(
int64_t targetMediaUs, int64_t *outRealUs) const {
if (outRealUs == NULL) {
return BAD_VALUE;
}
Mutex::Autolock autoLock(mLock);
if (mPlaybackRate == 0.0) {
return NO_INIT;
}
int64_t nowUs = ALooper::GetNowUs();
int64_t nowMediaUs;
status_t status =
getMediaTime_l(nowUs, &nowMediaUs, true /* allowPastMaxTime */);
if (status != OK) {
return status;
}
*outRealUs = (targetMediaUs - nowMediaUs) / (double)mPlaybackRate + nowUs;
return OK;
}
} // namespace android
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