麦克风音量检测
- (void)audio
{
//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;
}
- (void)detectionVoice
{
[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"]];
}
}
- (void) updateImage
{
[self.imageView
setImage:[UIImage imageNamed:@"record_animate_01.png"]];
}