iOS 使用EZAudio库生成wav出错的情况

Posted 2020-06-20 马在路上

使用EZAudio库

录M4A格式可以参考该库例子中的代码.

录wav格式得改下源码.看下面的代码

 1  AVAudiosession *session = [AVAudioSession sharedInstance];
 2     NSError *error = nil;
 3     [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
 4     if (error) NSLog(@"audio session category error: %@", error);
 5     [session setActive:YES error:&error];
 6     if (error) NSLog(@"audio session active error: %@", error);
 7 
 8     self.microphone = [EZMicrophone microphoneWithDelegate:self];
 9     self.recorder = [EZRecorder recorderWithURL:[NSURL fileURLWithPath:RECORD_PATH]
10                                    clientFormat:[self.microphone audioStreamBasicDescription]
11                                        fileType:EZRecorderFileTypeWAV // 指定为WAV格式
12                                        delegate:self];
13 
14     [self.microphone startFetchingAudio];
15     self.recording = YES;
16     self.audioTimer = [NSTimer scheduledTimerWithTimeInterval:1.0f
17                                                        target:self
18                                                      selector:@selector(audioTimer:)
19                                                      userInfo:nil repeats:YES];
20 
21 
22 // 定时器计算录音时间                                                     
23 - (void)audioTimer:(NSTimer *)timer
24 {
25     self.audioV.audioTime = (int)self.recorder.currentTime;
26 }
27 
28 // 这是个代理函数 可以用来计算音量
29 - (void)microphone:(EZMicrophone *)microphone
30   hasAudioReceived:(float **)buffer
31     withBufferSize:(UInt32)bufferSize
32 withNumberOfChannels:(UInt32)numberOfChannels
33 {
34     dispatch_async(dispatch_get_main_queue(), ^{
35         if (self.isRecording) {
36             CGFloat vol = [EZAudioUtilities RMS:buffer[0] length:bufferSize];
37             //vol就是音量 *150是因为放大后控制控件宽度
38             self.audioV.vol = (int)(vol * 150);
39         }
40     });
41 }

以上这种写法会闪退.原因是这个库录wav格式配置不对.

修改库中EZAudioUtilities.m文件第287行函数为

 1 + (AudioStreamBasicDescription)stereoFloatInterleavedFormatWithSampleRate:(float)sampleRate
 2 {
 3 #if 0 // 这个库本身的代码 录wav格式直接出错 闪退
 4     AudioStreamBasicDescription asbd;
 5     UInt32 floatByteSize   = sizeof(float);
 6     asbd.mChannelsPerFrame = 2;
 7     asbd.mBitsPerChannel   = 8 * floatByteSize;
 8     asbd.mBytesPerFrame    = asbd.mChannelsPerFrame * floatByteSize;
 9     asbd.mFramesPerPacket  = 1;
10     asbd.mBytesPerPacket   = asbd.mFramesPerPacket * asbd.mBytesPerFrame;
11     asbd.mFormatFlags      = kAudioFormatFlagIsFloat;
12     asbd.mFormatID         = kAudioFormatLinearPCM;
13     asbd.mSampleRate       = sampleRate;
14     asbd.mReserved         = 0;
15     return asbd;
16 #endif
17 
18     // 改用这种配置录出来就是wav格式
19     AudioStreamBasicDescription asbd;
20     memset(&asbd, 0, sizeof(asbd));
21     asbd.mSampleRate = 8000;            //采样率
22     asbd.mFormatID = kAudioFormatLinearPCM;
23     asbd.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
24     asbd.mChannelsPerFrame = 1;         //单声道
25     asbd.mFramesPerPacket = 1;          //每一个packet一侦数据
26     asbd.mBitsPerChannel = 16;          //每个采样点16bit量化
27     asbd.mBytesPerFrame = (asbd.mBitsPerChannel / 8) * asbd.mChannelsPerFrame;
28     asbd.mBytesPerPacket = asbd.mBytesPerFrame ;
29 
30     return asbd;
31 }

使用EncodeAudio库转为amr格式

提取密码: prdq

 1 //转成amr格式后发送 2 NSData * data = [[NSData alloc] initWithContentsOfFile:RECORD_PATH]; 3 data = [EncodeAudio convertWavToAmrFile:data];