芜湖窦德长简历:实例编程iPhone 录音和播放

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实例编程iPhone 录音和播放

2011-07-18 15:32 佚名 博客园 我要评论(0) 字号：T | T

本文介绍的是实例编程iPhone 录音和播放，本文帮友们实现一个录音的效果，很有趣，我们一起来看！

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    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

    2、创建录音项。

    1. - (void) prepareToRecord  
    2.  
    3. {  
    4.  
    5. AVAudioSession *audioSession = [AVAudioSession sharedInstance];  
    6.  
    7. NSError *err = nil;  
    8.  
    9. [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];  
    10.  
    11. if(err){  
    12.  
    13.         NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  
    14.  
    15.         return;  
    16.  
    17. }  
    18.  
    19. [audioSession setActive:YES error:&err];  
    20.  
    21. err = nil;  
    22.  
    23. if(err){  
    24.  
    25.         NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  
    26.  
    27.         return;  
    28.  
    29. }  
    30.  
    31. recordSetting = [[NSMutableDictionary alloc] init];  
    32.  
    33. [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];  
    34.  
    35. [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];   
    36.  
    37. [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];  
    38.  
    39. [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];  
    40.  
    41. [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];  
    42.  
    43. [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];  
    44.  
    45. // Create a new dated file  
    46. NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];  
    47. NSString *caldate = [now description];  
    48. recorderFilePath = [[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain];  
    49. NSURL *url = [NSURL fileURLWithPath:recorderFilePath];  
    50. err = nil;  
    51. recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err];  
    52. if(!recorder){  
    53.         NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]);  
    54.         UIAlertView *alert =  
    55.         [[UIAlertView alloc] initWithTitle: @"Warning"  
    56.   message: [err localizedDescription]  
    57.   delegate: nil  
    58. cancelButtonTitle:@"OK"  
    59. otherButtonTitles:nil];  
    60.         [alert show];  
    61.         [alert release];  
    62.         return;  
    63. }  
    64. //prepare to record  
    65. [recorder setDelegate:self];  
    66. [recorder prepareToRecord];  
    67. recorder.meteringEnabled = YES;  
    68. BOOL audioHWAvailable = audioSession.inputIsAvailable;  
    69. if (! audioHWAvailable) {  
    70.         UIAlertView *cantRecordAlert =  
    71.         [[UIAlertView alloc] initWithTitle: @"Warning"  
    72.   message: @"Audio input hardware not available"  
    73.   delegate: nil  
    74. cancelButtonTitle:@"OK"  
    75. otherButtonTitles:nil];  
    76.         [cantRecordAlert show];  
    77.         [cantRecordAlert release];   
    78.         return;  
    79. }  
    80. }

    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：

    1. (void)startrecorder  
    2. {  
    3. [recorder record];  
    4. }

    这样就在我们创建的路径下开始了录音。完成录音很简单：

    1. (void) stopRecording{  
    2. [recorder stop];  
    3. }

    这里顺便提一下录音的代理方法：

    1. - (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag  
    2. {  
    3. NSLog(@"recorder successfully");  
    4. UIAlertView *recorderSuccessful = [[UIAlertView alloc] initWithTitle:@"" message:@"录音成功"
    5. delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];  
    6. [recorderSuccessful show];  
    7. [recorderSuccessful release];  
    8. }  
    9.  
    10. - (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)arecorder error:(NSError *)error  
    11. {  
    12. btnRecorder.enabled = NO;  
    13. UIAlertView *recorderFailed = [[UIAlertView alloc] initWithTitle:@"" message:@"发生错误"
    14. delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];  
    15. [recorderFailed show];  
    16. [recorderFailed release];  
    17. }

    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。

    1. - (void) updateAudioDisplay {  
    2.  
    3. if (isStart == NO) {  
    4.  
    5. currentTimeLabel.text = @"--:--";  
    6.  
    7. } else {  
    8.  
    9. double currentTime = recorder.currentTime;  
    10.  
    11. currentTimeLabel.text = [NSString stringWithFormat: @"d:d",  
    12.  
    13. (int) currentTime/60,  
    14.  
    15. (int) currentTime%60];  
    16.  
    17. //START:code.RecordViewController.setlevelmeters  
    18.  
    19. [recorder updateMeters];  
    20.  
    21. [leftLevelMeter setPower: [recorder averagePowerForChannel:0]  
    22.  
    23. peak: [recorder peakPowerForChannel: 0]];  
    24.  
    25. if (! rightLevelMeter.hidden) {  
    26.  
    27. [rightLevelMeter setPower: [recorder averagePowerForChannel:1]  
    28.  
    29. peak: [recorder peakPowerForChannel: 1]];  
    30.  
    31. }  
    32.  
    33. //END:code.RecordViewController.setlevelmeters  
    34.  
    35. }  
    36.  
    37. }  
    38.  
    39. 以上就是录音相关的内容。  
    40.  
    41. 下面说一下播放的方法：  
    42.  
    43. void SystemSoundsDemoCompletionProc (  
    44. SystemSoundID  soundID,  
    45. void           *clientData)  
    46. {  
    47. AudioServicesDisposeSystemSoundID (soundID);  
    48. ((AudioRecorderPlayerAppDelegate*)clientData).statusLabel.text = @"Stopped";  
    49. }  
    50. -(void)playAudio  
    51. {  
    52. //START:code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound  
    53. // create a system sound id for the selected row  
    54. SystemSoundID soundID;  
    55. OSStatus err = kAudioServicesNoError;  
    56. // special case: vibrate//震动  
    57. //soundID = kSystemSoundID_Vibrate; // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.vibratesystemsound"/> 
    58.  
    59. // find corresponding CAF file  
    60.  
    61. //NSString *cafName = [NSString stringWithFormat: @"%@",recorderFilePath]; // id="code.SystemSoundsDemo.
    62. SystemSoundsDemoViewController.createsystemsound.rowtonumberstring"/> 
    63.  
    64. NSURL *url = [NSURL fileURLWithPath:recorderFilePath];  
    65. //NSString *cafPath =   
    66. //[[NSBundle mainBundle] pathForResource:cafName ofType:@"caf"]; // id="code.SystemSoundsDemo.
    67. SystemSoundsDemoViewController.createsystemsound.findcafinbundle"/> 
    68. //NSURL *cafURL = [NSURL fileURLWithPath:url]; // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.
    69. createsystemsound.fileurlwithpath"/> 
    70. err = AudioServicesCreateSystemSoundID((CFURLRef) url, &soundID); // id="code.SystemSoundsDemo.
    71. SystemSoundsDemoViewController.createsystemsound.createsystemsound"/> 
    72. //END:code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound  
    73. //START:code.SystemSoundsDemo.SystemSoundsDemoViewController.registercompletionprocandplaysound  
    74. if (err == kAudioServicesNoError) {  
    75.  
    76. // set up callback for sound completion  
    77. err = AudioServicesAddSystemSoundCompletion // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.
    78. createsystemsound.addcompletionproc"/> 
    79. (soundID,// sound to monitor  
    80. NULL,// run loop (NULL==main)  
    81. NULL,// run loop mode (NULL==default)  
    82. SystemSoundsDemoCompletionProc, // callback function // id="code.SystemSoundsDemo.
    83. SystemSoundsDemoViewController.createsystemsound.completionprocroutine"/> 
    84. self // data to provide on callback  
    85. ); // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.addcompletionprocend"/> 
    86. statusLabel.text = @"Playing"; // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.setlabel"/> 
    87. AudioServicesPlaySystemSound (soundID); // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.playsound"/> 
    88. }  
    89. if (err != kAudioServicesNoError) { // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.errorblockstart"/> 
    90. CFErrorRef error = CFErrorCreate(NULL, kCFErrorDomainOSStatus, err, NULL); // id="code.SystemSoundsDemo.
    91. SystemSoundsDemoViewController.createsystemsound.createcferror"/> 
    92. NSString *errorDesc = (NSString*) CFErrorCopyDescription (error); // id="code.SystemSoundsDemo.
    93. SystemSoundsDemoViewController.createsystemsound.copycferrordescription"/> 
    94. UIAlertView *cantPlayAlert =  
    95. [[UIAlertView alloc] initWithTitle:@"Cannot Play:"  
    96.   message: errorDesc  
    97.   delegate:nil  
    98. cancelButtonTitle:@"OK"  
    99. otherButtonTitles:nil];  
    100. [cantPlayAlert show];  
    101. [cantPlayAlert release];   
    102. [errorDesc release]; // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.releaseerrordescription"/> 
    103. CFRelease (error); // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.releaseerror"/> 
    104. } // id="code.SystemSoundsDemo.SystemSoundsDemoViewController.createsystemsound.errorblockend"/> 
    105. //END:code.SystemSoundsDemo.SystemSoundsDemoViewController.registercompletionprocandplaysound  
    106. }

    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

    小结：实例编程iPhone 录音和播放的内容介绍完了，希望本文对你有所帮助

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