blob: 387ac5a6f4c9b3ae61318ba433815579f930d8c7 [file] [log] [blame]
/*
* 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 "FrameDropper"
#include <utils/Log.h>
#include <media/stagefright/bqhelper/FrameDropper.h>
#include <media/stagefright/foundation/ADebug.h>
namespace android {
static const int64_t kMaxJitterUs = 2000;
FrameDropper::FrameDropper()
: mDesiredMinTimeUs(-1),
mMinIntervalUs(0) {
}
FrameDropper::~FrameDropper() {
}
status_t FrameDropper::setMaxFrameRate(float maxFrameRate) {
if (maxFrameRate < 0) {
mMinIntervalUs = -1LL;
return OK;
}
if (maxFrameRate == 0) {
ALOGE("framerate should be positive but got %f.", maxFrameRate);
return BAD_VALUE;
}
mMinIntervalUs = (int64_t) (1000000.0f / maxFrameRate);
return OK;
}
bool FrameDropper::shouldDrop(int64_t timeUs) {
if (mMinIntervalUs <= 0) {
return false;
}
if (mDesiredMinTimeUs < 0) {
mDesiredMinTimeUs = timeUs + mMinIntervalUs;
ALOGV("first frame %lld, next desired frame %lld",
(long long)timeUs, (long long)mDesiredMinTimeUs);
return false;
}
if (timeUs < (mDesiredMinTimeUs - kMaxJitterUs)) {
ALOGV("drop frame %lld, desired frame %lld, diff %lld",
(long long)timeUs, (long long)mDesiredMinTimeUs,
(long long)(mDesiredMinTimeUs - timeUs));
return true;
}
int64_t n = (timeUs - mDesiredMinTimeUs + kMaxJitterUs) / mMinIntervalUs;
mDesiredMinTimeUs += (n + 1) * mMinIntervalUs;
ALOGV("keep frame %lld, next desired frame %lld, diff %lld",
(long long)timeUs, (long long)mDesiredMinTimeUs,
(long long)(mDesiredMinTimeUs - timeUs));
return false;
}
} // namespace android