实例编程iPhone 录音和播放（收藏）

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

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