我要评论概述：
可用于音频、二维码、拍照、录制视频 （均可自定义界面）
常见的输出信号：
- avcaptureaudiodataoutput 音频输出
- avcapturefileoutput 文本输出
- avcapturemetadataoutput 二维码 条形码…
- avcapturestillimageoutput 拍照
- avcapturemoviefileoutput 录制视频（不能实现暂停录制和定义视频文件类型）
- avcapturevideodataoutput + avcaptureaudiodataoutput 录制视频的灵活性更强（能实现暂停录制和定义视频文件类型）
avcapturemoviefileoutput输出流实现视频录制
初始化会话层
-(void)sessionconfiguration{
//初始化一个会话
session = [[avcapturesession alloc] init];
[session setsessionpreset:avcapturesessionpresetmedium];
//创建视频设备
avcapturedevice *videodevice = [avcapturedevice defaultdevicewithmediatype:avmediatypevideo];
//根据设备创建输入信号
deviceinput = [avcapturedeviceinput deviceinputwithdevice:videodevice error:nil];
//添加 输出设备 moviefile
self.devicemoviefileoutput = [[avcapturemoviefileoutput alloc] init];
[session beginconfiguration];
//session添加设备输入信号
if ([session canaddinput:deviceinput]) {
[session addinput:deviceinput];
}
//session添加设备输出信号
if ([session canaddoutput:self.devicemoviefileoutput]) {
[session addoutput:self.devicemoviefileoutput];
}
[session commitconfiguration];
}
创建预览图层
-(void)embedlayerwithview:(uiview *)view{
if (session == nil) {
return;
}
videopreviewlayer = [avcapturevideopreviewlayer layerwithsession:session];
//设置图层的大小
videopreviewlayer.frame = view.bounds;
videopreviewlayer.videogravity = avlayervideogravityresizeaspectfill;
[view.layer addsublayer:videopreviewlayer];
[session startrunning];
}
录制视频
-(void)takephoto:(nsurl *)fileurl{
[self.devicemoviefileoutput startrecordingtooutputfileurl:fileurl recordingdelegate:self];
}
结束录制
-(uiimageview *)finishrecord:(uiview *)view isanewrecording:(bool)anewrecording{
gifimageview = [[uiimageview alloc] initwithframe:view.bounds];
[view addsubview:gifimageview];
isanewrecording = anewrecording; //存储是否重新录制
//停止录制(停止录制后做代理方法)
[self.devicemoviefileoutput stoprecording];
return gifimageview;
}
拍摄视频保存路径
+(nsstring *)getvideosavefilepath{
nsstring*documentpath = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject];
nsstring *filepath = [documentpath stringbyappendingpathcomponent:@"video.mp4"];
return filepath;
}
会话层启动和关闭
-(void)startcamera{
[session startrunning];
}
-(void)stopcamera{
[session stoprunning];
}
代理方法
- (void)captureoutput:(avcapturefileoutput *)captureoutput didfinishrecordingtooutputfileaturl:(nsurl *)outputfileurl fromconnections:(nsarray *)connections error:(nserror *)error{
nslog(@"完成录制");
nslog(@"outputfileurl = %@",outputfileurl);
//**重新录制**//
if (isanewrecording) {
//**删除视频文件**//
nsfilemanager *manager = [nsfilemanager defaultmanager];
[manager removeitematpath:outputfileurl.absolutestring error:nil];
}
//**不取消录制**//
else{
//**获取视频时长**//
avurlasset *avurl = [avurlasset urlassetwithurl:outputfileurl options:nil];
cmtime time = [avurl duration];
int seconds = ceil(time.value/time.timescale);
nslog(@"seconds = %d",seconds);
if ([self.delegate respondstoselector:@selector(videoduration:)]) {
[self.delegate videoduration:seconds];
}
if ([self.delegate respondstoselector:@selector(playervideo:)]) {
[self.delegate playervideo:outputfileurl.absolutestring];
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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