GPUImage录制视频的暂停

定义一个自己的writer继承GPUImageMovieWriter

#import@interface YQSImageMovieWriter : GPUImageMovieWriter

-(void)pause;

-(void)continueWrite;

-(void)configure;//每次暂停或者播放之前都要调用

@end

//

//  YQSImageMovieWriter.m

//  YQSImageViewController

//

//  Created by lenkeng on 17/01/2018.

//  Copyright © 2018 lenkeng. All rights reserved.

//

#import "YQSImageMovieWriter.h"

@interface YQSImageMovieWriter(){

    BOOL _isPause;

//    BOOL _isAudioOn;

    CMTime _offset;

    CMTime _timeOffset;

    CMTime _last;

    BOOL _isDisCount;

}

@end

@implementation YQSImageMovieWriter

//BOOL _isDisCount = YES;

//CMTime _offset = kCMTimeZero;

//CMTime _timeOffset = CMTimeMake(0, 1);

//CMTime _isDisCount = YES;

-(void)newFrameReadyAtTime:(CMTime)frameTime atIndex:(NSInteger)textureIndex{

    if (_isPause) {

        return;

    }

    if (_isDisCount) {

        _isDisCount = NO;

        _offset = CMTimeSubtract(frameTime, _last);

        if (_offset.value > 0) {

            _timeOffset = CMTimeAdd(_timeOffset, _offset);

        }

    }

    _last = frameTime;

    frameTime = CMTimeSubtract(frameTime, _timeOffset);

//    NSLog(@"_timeOffset->%lf, ->%lf", _timeOffset.value, _timeOffset.timescale);

    [super newFrameReadyAtTime:frameTime atIndex:textureIndex];

}

-(void)pause{

    _isPause = YES;

}

-(void)continueWrite{

    _isPause = NO;

//    [self configure];

}

-(void)configure{

    _timeOffset = CMTimeMake(0, 1);

    _isDisCount = YES;

//    _isAudioOn = YES;

    _offset = kCMTimeZero;

}

-(void)processAudioBuffer:(CMSampleBufferRef)audioBuffer{

    if (_isPause) {

        return;

    }

   [super processAudioBuffer:audioBuffer];

}

@end

注释一下 configure在录制,暂停,之前调用即可