1cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei/* 2cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * Copyright (C) 2015 The Android Open Source Project 3cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * 4cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * Licensed under the Apache License, Version 2.0 (the "License"); 5cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * you may not use this file except in compliance with the License. 6cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * You may obtain a copy of the License at 7cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * 8cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * http://www.apache.org/licenses/LICENSE-2.0 9cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * 10cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * Unless required by applicable law or agreed to in writing, software 11cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * distributed under the License is distributed on an "AS IS" BASIS, 12cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * See the License for the specific language governing permissions and 14cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei * limitations under the License. 15cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei */ 16cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 17cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei//#define LOG_NDEBUG 0 18cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei#define LOG_TAG "FrameDropper" 19cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei#include <utils/Log.h> 20cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 21cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei#include "FrameDropper.h" 22cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 23cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei#include <media/stagefright/foundation/ADebug.h> 24cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 25cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Weinamespace android { 26cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 27cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Weistatic const int64_t kMaxJitterUs = 2000; 28cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 29cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark WeiFrameDropper::FrameDropper() 30cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei : mDesiredMinTimeUs(-1), 31cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei mMinIntervalUs(0) { 32cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei} 33cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 34cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark WeiFrameDropper::~FrameDropper() { 35cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei} 36cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei 37cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Weistatus_t FrameDropper::setMaxFrameRate(float maxFrameRate) { 38cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei if (maxFrameRate <= 0) { 39cea0c012d538f11b3ee97d4b7e78f4c1ea73d5beMark Wei ALOGE("framerate should be positive but got %f.", maxFrameRate); 40 return BAD_VALUE; 41 } 42 mMinIntervalUs = (int64_t) (1000000.0f / maxFrameRate); 43 return OK; 44} 45 46bool FrameDropper::shouldDrop(int64_t timeUs) { 47 if (mMinIntervalUs <= 0) { 48 return false; 49 } 50 51 if (mDesiredMinTimeUs < 0) { 52 mDesiredMinTimeUs = timeUs + mMinIntervalUs; 53 ALOGV("first frame %lld, next desired frame %lld", 54 (long long)timeUs, (long long)mDesiredMinTimeUs); 55 return false; 56 } 57 58 if (timeUs < (mDesiredMinTimeUs - kMaxJitterUs)) { 59 ALOGV("drop frame %lld, desired frame %lld, diff %lld", 60 (long long)timeUs, (long long)mDesiredMinTimeUs, 61 (long long)(mDesiredMinTimeUs - timeUs)); 62 return true; 63 } 64 65 int64_t n = (timeUs - mDesiredMinTimeUs + kMaxJitterUs) / mMinIntervalUs; 66 mDesiredMinTimeUs += (n + 1) * mMinIntervalUs; 67 ALOGV("keep frame %lld, next desired frame %lld, diff %lld", 68 (long long)timeUs, (long long)mDesiredMinTimeUs, 69 (long long)(mDesiredMinTimeUs - timeUs)); 70 return false; 71} 72 73} // namespace android 74