实例编程iPhone 录音和播放

实例编程iPhone 录音和播放是本文要介绍的内容，最近准备做一个关于录音和播放的项目！查了一些资料，很简单的做了一个，下面我就分享一下iPhone的录音和播放的使用心得。iPhone的录音和播放使用到了media层的内容，media层处于cocoa层之下，用到的很大一部分都是c语言的结构。1、引入框架。#import <AVFoundation/AVFoundation.h>2、创建录音项。- (void) prepareToRecord  {  AVAudioSession *audioSession = [AVAudioSession sharedInstance];  NSError *err = nil;  [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];  if(err){  NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  return;  }  [audioSession setActive:YES error:&err];  err = nil;  if(err){  NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  return;  }  recordSetting = [[NSMutableDictionary alloc] init];  [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];  [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];   [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];  [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];  [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];  [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];  // Create a new dated file  NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];  NSString *caldate = [now description];  recorderFilePath = [[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain];  NSURL *url = [NSURL fileURLWithPath:recorderFilePath];  err = nil;  recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err];  if(!recorder){  NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  UIAlertView *alert =  [[UIAlertView alloc] initWithTitle: @"Warning"  message: [err localizedDescription]  delegate: nil  cancelButtonTitle:@"OK"  otherButtonTitles:nil];  [alert show];  [alert release];  return;  }  //prepare to record  [recorder setDelegate:self];  [recorder prepareToRecord];  recorder.meteringEnabled = YES;  BOOL audioHWAvailable = audioSession.inputIsAvailable;  if (! audioHWAvailable) {  UIAlertView *cantRecordAlert =  [[UIAlertView alloc] initWithTitle: @"Warning"  message: @"Audio input hardware not available"  delegate: nil  cancelButtonTitle:@"OK"  otherButtonTitles:nil];  [cantRecordAlert show];  [cantRecordAlert release];   return;  }  } 以上这个方法就是创建了录音项，其中包括录音的路径和一些音频属性，但只是准备录音还没有录，如果要录的话还要加入以下的方法：(void)startrecorder  {  [recorder record];  } 这样就在我们创建的路径下开始了录音。完成录音很简单：(void) stopRecording{  [recorder stop];  } 这里顺便提一下录音的代理方法：- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag  {  NSLog(@"recorder successfully");  UIAlertView *recorderSuccessful = [[UIAlertView alloc] initWithTitle:@"" message:@"录音成功"delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];  [recorderSuccessful show];  [recorderSuccessful release];  }  - (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)arecorder error:(NSError *)error  {  btnRecorder.enabled = NO;  UIAlertView *recorderFailed = [[UIAlertView alloc] initWithTitle:@"" message:@"发生错误"delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];  [recorderFailed show];  [recorderFailed release];  } 以上两个代理方法分别指定了录音的成功或失败。录音中有一个的录音对象有一个averagePowerForChannel和peakPowerForChannel的属性分别为声音的最高振幅和平均振幅，有了他们就可以做一个动态的振幅的录音效果。- (void) updateAudioDisplay {  if (isStart == NO) {  currentTimeLabel.text = @"--:--";  } else {  double currentTime = recorder.currentTime;  currentTimeLabel.text = [NSString stringWithFormat: @"d:d",  (int) currentTime/60,  (int) currentTime%60];  //START:code.RecordViewController.setlevelmeters  [recorder updateMeters];  [leftLevelMeter setPower: [recorder averagePowerForChannel:0]  peak: [recorder peakPowerForChannel: 0]];  if (! rightLevelMeter.hidden) {  [rightLevelMeter setPower: [recorder averagePowerForChannel:1]  peak: [recorder peakPowerForChannel: 1]];  }  //END:code.RecordViewController.setlevelmeters  }  }  以上就是录音相关的内容。  下面说一下播放的方法：  void SystemSoundsDemoCompletionProc (  SystemSoundID  soundID,  void           *clientData)  {  AudioServicesDisposeSystemSoundID (soundID);  ((AudioRecorderPlayerAppDelegate*)clientData).statusLabel.text = @"Stopped";  }  -(void)playAudio  {  //START:code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound  // create a system sound id for the selected row  SystemSoundID soundID;  OSStatus err = kAudioServicesNoError;  // special case: vibrate//震动  //soundID = kSystemSoundID_Vibrate; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.vibratesystemsound"/> // find corresponding CAF file  //NSString *cafName = [NSString stringWithFormat: @"%@",recorderFilePath]; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.rowtonumberstring"/> NSURL *url = [NSURL fileURLWithPath:recorderFilePath];  //NSString *cafPath =   //[[NSBundle mainBundle] pathForResource:cafName ofType:@"caf"]; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.findcafinbundle"/> //NSURL *cafURL = [NSURL fileURLWithPath:url]; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.fileurlwithpath"/> err = AudioServicesCreateSystemSoundID((CFURLRef) url, &soundID); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.createsystemsound"/> //END:code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound  //START:code.SystemSoundsDemo.SystemSoundsDemoViewController.registercompletionprocandplaysound  if (err == kAudioServicesNoError) {  // set up callback for sound completion  err = AudioServicesAddSystemSoundCompletion //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.addcompletionproc"/> (soundID,// sound to monitor  NULL,// run loop (NULL==main)  NULL,// run loop mode (NULL==default)  SystemSoundsDemoCompletionProc, // callback function //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.completionprocroutine"/> self // data to provide on callback  ); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.addcompletionprocend"/> statusLabel.text = @"Playing"; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.setlabel"/> AudioServicesPlaySystemSound (soundID); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.playsound"/> }  if (err != kAudioServicesNoError) { //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.errorblockstart"/> CFErrorRef error = CFErrorCreate(NULL, kCFErrorDomainOSStatus, err, NULL); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.createcferror"/> NSString *errorDesc = (NSString*) CFErrorCopyDescription (error); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.copycferrordescription"/> UIAlertView *cantPlayAlert =  [[UIAlertView alloc] initWithTitle:@"Cannot Play:"  message: errorDesc  delegate:nil  cancelButtonTitle:@"OK"  otherButtonTitles:nil];  [cantPlayAlert show];  [cantPlayAlert release];   [errorDesc release]; //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.releaseerrordescription"/> CFRelease (error); //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.releaseerror"/> } //<label id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.errorblockend"/> //END:code.SystemSoundsDemo.SystemSoundsDemoViewController.registercompletionprocandplaysound  } 通过以上的方法就应该能够实现播放，播放的时候也是可以加入振幅过程的，大家可以试试！这样一个iPhone录音机就做好了！哈哈

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