IOS-录音功能
初始化avaudiorecorder并设置录音的参数和存储地址：
[cpp]
//录音设置
nsmutabledictionary *recordsetting = [[[nsmutabledictionary alloc]init] autorelease];
//设置录音格式 avformatidkey==kaudioformatlinearpcm
[recordsetting setvalue:[nsnumber numberwithint:kaudioformatmpeg4aac] forkey:avformatidkey];
//设置录音采样率(hz) 如：avsampleratekey==8000/44100/96000（影响音频的质量）
[recordsetting setvalue:[nsnumber numberwithfloat:44100] forkey:avsampleratekey];
//录音通道数 1 或 2
[recordsetting setvalue:[nsnumber numberwithint:1] forkey:avnumberofchannelskey];
//线性采样位数 8、16、24、32
[recordsetting setvalue:[nsnumber numberwithint:16] forkey:avlinearpcmbitdepthkey];
//录音的质量
[recordsetting setvalue:[nsnumber numberwithint:avaudioqualityhigh] forkey:avencoderaudioqualitykey];
nsstring *strurl = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject];
nsurl *url = [nsurl fileurlwithpath:[nsstring stringwithformat:@"%@/lll.aac", strurl]];
urlplay = url;
nserror *error;
//初始化
recorder = [[avaudiorecorder alloc]initwithurl:url settings:recordsetting error:&error];
//开启音量检测
recorder.meteringenabled = yes;
recorder.delegate = self;
//录音设置
nsmutabledictionary *recordsetting = [[[nsmutabledictionary alloc]init] autorelease];
//设置录音格式 avformatidkey==kaudioformatlinearpcm
[recordsetting setvalue:[nsnumber numberwithint:kaudioformatmpeg4aac] forkey:avformatidkey];
//设置录音采样率(hz) 如：avsampleratekey==8000/44100/96000（影响音频的质量）
[recordsetting setvalue:[nsnumber numberwithfloat:44100] forkey:avsampleratekey];
//录音通道数 1 或 2
[recordsetting setvalue:[nsnumber numberwithint:1] forkey:avnumberofchannelskey];
//线性采样位数 8、16、24、32
[recordsetting setvalue:[nsnumber numberwithint:16] forkey:avlinearpcmbitdepthkey];
//录音的质量
[recordsetting setvalue:[nsnumber numberwithint:avaudioqualityhigh] forkey:avencoderaudioqualitykey];
nsstring *strurl = [nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes) lastobject];
nsurl *url = [nsurl fileurlwithpath:[nsstring stringwithformat:@"%@/lll.aac", strurl]];
urlplay = url;
nserror *error;
//初始化
recorder = [[avaudiorecorder alloc]initwithurl:url settings:recordsetting error:&error];
//开启音量检测
recorder.meteringenabled = yes;
recorder.delegate = self;
识别音量的大小，从而显示不同的图片，来呈现出音量图波动
[cpp]
[recorder updatemeters];//刷新音量数据
//获取音量的平均值 [recorder averagepowerforchannel:0];
//音量的最大值 [recorder peakpowerforchannel:0];
double lowpassresults = pow(10, (0.05 * [recorder peakpowerforchannel:0]));
nslog(@"%lf",lowpassresults);
//最大50 0
//图片 小-》大
if (0<lowpassresults<=0.06) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_01.png"]];
}else if (0.06<lowpassresults<=0.13) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_02.png"]];
}else if (0.13<lowpassresults<=0.20) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_03.png"]];
}else if (0.20<lowpassresults<=0.27) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_04.png"]];
}else if (0.27<lowpassresults<=0.34) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_05.png"]];
}else if (0.34<lowpassresults<=0.41) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_06.png"]];
}else if (0.41<lowpassresults<=0.48) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_07.png"]];
}else if (0.48<lowpassresults<=0.55) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_08.png"]];
}else if (0.55<lowpassresults<=0.62) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_09.png"]];
}else if (0.62<lowpassresults<=0.69) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_10.png"]];
}else if (0.69<lowpassresults<=0.76) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_11.png"]];
}else if (0.76<lowpassresults<=0.83) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_12.png"]];
}else if (0.83<lowpassresults<=0.9) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_13.png"]];
}else {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_14.png"]];
}
[recorder updatemeters];//刷新音量数据
//获取音量的平均值 [recorder averagepowerforchannel:0];
//音量的最大值 [recorder peakpowerforchannel:0];
double lowpassresults = pow(10, (0.05 * [recorder peakpowerforchannel:0]));
nslog(@"%lf",lowpassresults);
//最大50 0
//图片 小-》大
if (0<lowpassresults<=0.06) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_01.png"]];
}else if (0.06<lowpassresults<=0.13) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_02.png"]];
}else if (0.13<lowpassresults<=0.20) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_03.png"]];
}else if (0.20<lowpassresults<=0.27) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_04.png"]];
}else if (0.27<lowpassresults<=0.34) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_05.png"]];
}else if (0.34<lowpassresults<=0.41) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_06.png"]];
}else if (0.41<lowpassresults<=0.48) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_07.png"]];
}else if (0.48<lowpassresults<=0.55) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_08.png"]];
}else if (0.55<lowpassresults<=0.62) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_09.png"]];
}else if (0.62<lowpassresults<=0.69) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_10.png"]];
}else if (0.69<lowpassresults<=0.76) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_11.png"]];
}else if (0.76<lowpassresults<=0.83) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_12.png"]];
}else if (0.83<lowpassresults<=0.9) {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_13.png"]];
}else {
[self.imageview setimage:[uiimage imagenamed:@"record_animate_14.png"]];
}