IOS中录音后再播放声音太小问题解决
- (BOOL)canRecord
{
__block BOOL bCanRecord = YES;
if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending)
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
[audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
if (granted) {
bCanRecord = YES;
} else {
bCanRecord = NO;
}
}];
}
}
return bCanRecord;
}
-(void)initRecordSession
{
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[session setActive:YES error:nil];
}
-(void)onRecordSoundStop:(UIButton *)sender
{
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil]; //此处需要恢复设置回放标志，否则会导致其它播放声音也会变小
[session setActive:YES error:nil];
[_timerRec invalidate];
if (_recorder.currentTime > 1)
{
[_recorder stop];
PlayNodeData *model = _dataOfVideoArrary[sender.tag];
model.hasSound = YES;
[_btnPlay setImage:[UIImage imageNamed:@"simulate_image_play1"] forState:UIControlStateNormal];
}
}
//
-(void)onRecordSoundStart:(UIButton *)sender
{
if (![self canRecord])
{
[[[UIAlertView alloc] initWithTitle:nil
message:[NSString stringWithFormat:@"应用需要访问您的麦克风。\n请启用麦克风-设置/隐私/麦克风"]
delegate:nil
cancelButtonTitle:@"好"
otherButtonTitles:nil] show];
return;
}
[self initRecordSession];
NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithFloat:44100.0],AVSampleRateKey , //采样率 8000/44100/96000
[NSNumber numberWithInt:kAudioFormatMPEG4AAC],AVFormatIDKey, //录音格式
[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey, //线性采样位数 8、16、24、32
[NSNumber numberWithInt:2],AVNumberOfChannelsKey, //声道 1，2
[NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey, //录音质量
nil];
NSURL *strURL = [NSURL fileURLWithPath:[self GetRecordSoundFileName:sender.tag]];
_recorder = [[AVAudioRecorder alloc] initWithURL:strURL settings:settings error:nil];
_recorder.meteringEnabled = YES;
_recorder.delegate = self;
[_recorder prepareToRecord];
[_recorder record];
_timerRec = [NSTimer scheduledTimerWithTimeInterval:0 target:self selector:@selector(detectionVoice) userInfo:nil repeats:YES];
}
-(void)detectionVoice
{
return;
[_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 ; }else if (0.06 ; }else if (0.13 ; }else if (0.20 ; } }