这是我的问题:
代码(FooController):
NSString *path = [[NSBundle mainBundle] pathForResource:@"mySound" ofType:@"m4v"];
soundEffect = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[soundEffect play];
// MicBlow
micBlow = [[MicBlowController alloc]init];
MicBlowController包含:
NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];
NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat: 44100.0], AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey,
nil];
和
[recorder updateMeters];
const double ALPHA = 0.05;
double peakPowerForChannel = pow(10,(0.05*[recorder peakPowerForChannel:0]));
lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
NSLog(@"Average input: %f Peak input %f Low pass results: %f",[recorder averagePowerForChannel:0],[recorder peakPowerForChannel:0],lowPassResults);
如果我播放背景音并尝试从麦克风获得峰值,我会得到这个日志: 平均输入:0.000000峰值输入-120.000000低通结果:0.000001
但是,如果我评论有关AVAudioPlayer的所有部分,它的确有效。我认为存在渠道问题。
由于
答案 0 :(得分:6)
好吧,我找到了解决方案,它是AVAudioSession!
通过使用方法setCategory(使用AVAudioSessionCategoryPlayAndRecord作为参数),我可以播放声音并从麦克风录制声音。
audioSession = [[AVAudioSession sharedInstance] retain];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
[audioSession setActive:YES error: nil];