78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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* Copyright (C) 2015 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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//#define LOG_NDEBUG 0
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#define LOG_TAG "FrameDropper"
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#include <utils/Log.h>
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#include <media/stagefright/bqhelper/FrameDropper.h>
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#include <media/stagefright/foundation/ADebug.h>
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namespace android {
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static const int64_t kMaxJitterUs = 2000;
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FrameDropper::FrameDropper()
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: mDesiredMinTimeUs(-1),
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mMinIntervalUs(0) {
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}
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FrameDropper::~FrameDropper() {
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}
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status_t FrameDropper::setMaxFrameRate(float maxFrameRate) {
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if (maxFrameRate < 0) {
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mMinIntervalUs = -1LL;
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return OK;
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}
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if (maxFrameRate == 0) {
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ALOGE("framerate should be positive but got %f.", maxFrameRate);
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return BAD_VALUE;
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}
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mMinIntervalUs = (int64_t) (1000000.0f / maxFrameRate);
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return OK;
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}
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bool FrameDropper::shouldDrop(int64_t timeUs) {
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if (mMinIntervalUs <= 0) {
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return false;
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}
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if (mDesiredMinTimeUs < 0) {
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mDesiredMinTimeUs = timeUs + mMinIntervalUs;
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ALOGV("first frame %lld, next desired frame %lld",
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(long long)timeUs, (long long)mDesiredMinTimeUs);
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return false;
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}
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if (timeUs < (mDesiredMinTimeUs - kMaxJitterUs)) {
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ALOGV("drop frame %lld, desired frame %lld, diff %lld",
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(long long)timeUs, (long long)mDesiredMinTimeUs,
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(long long)(mDesiredMinTimeUs - timeUs));
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return true;
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}
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int64_t n = (timeUs - mDesiredMinTimeUs + kMaxJitterUs) / mMinIntervalUs;
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mDesiredMinTimeUs += (n + 1) * mMinIntervalUs;
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ALOGV("keep frame %lld, next desired frame %lld, diff %lld",
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(long long)timeUs, (long long)mDesiredMinTimeUs,
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(long long)(mDesiredMinTimeUs - timeUs));
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return false;
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}
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} // namespace android
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