ios 如何使用 AVAudioRecorder 在 iPhone 上录制音频？
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How do I record audio on iPhone with AVAudioRecorder?
提问by Jim Zimmerman
Now that iPhone 3.0 sdk is public, I think I can ask this question for those of you that have already been playing with the 3.0 sdk. I want to record audio in my application, but I want to use AVAudioRecorder and not the older way of recording like the example SpeakHere shows. There are not any examples of how to best do this in the iPhone Dev Center and only reference to the classes. I am a newbie at iPhone development, so I am looking for a simple sample to get me started. Thanks in advance.
现在 iPhone 3.0 sdk 是公开的，我想我可以向那些已经在玩 3.0 sdk 的人提出这个问题。我想在我的应用程序中录制音频，但我想使用 AVAudioRecorder 而不是像 SpeakHere 所示的示例那样的旧录制方式。iPhone Dev Center 中没有任何关于如何最好地做到这一点的示例，仅参考了这些类。我是 iPhone 开发的新手，所以我正在寻找一个简单的示例来帮助我入门。提前致谢。
回答by Massimo Cafaro
Actually, there are no examples at all. Here is my working code. Recording is triggered by the user pressing a button on the navBar. The recording uses cd quality (44100 samples), stereo (2 channels) linear pcm. Beware: if you want to use a different format, especially an encoded one, make sure you fully understand how to set the AVAudioRecorder settings (read carefully the audio types documentation), otherwise you will never be able to initialize it correctly. One more thing. In the code, I am not showing how to handle metering data, but you can figure it out easily. Finally, note that the AVAudioRecorder method deleteRecording as of this writing crashes your application. This is why I am removing the recorded file through the File Manager. When recording is done, I save the recorded audio as NSData in the currently edited object using KVC.
实际上，根本没有任何例子。这是我的工作代码。录制由用户按下导航栏上的按钮触发。录音使用 cd 质量（44100 个样本）、立体声（2 通道）线性 pcm。注意：如果您想使用不同的格式，尤其是编码格式，请确保您完全了解如何设置 AVAudioRecorder 设置（请仔细阅读音频类型文档），否则您将永远无法正确初始化它。还有一件事。在代码中，我没有展示如何处理计量数据，但您可以很容易地弄清楚。最后，请注意在撰写本文时 AVAudioRecorder 方法 deleteRecording 会使您的应用程序崩溃。这就是我通过文件管理器删除录制文件的原因。录制完成后，我使用 KVC 在当前编辑的对象中将录制的音频保存为 NSData。
#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
- (void) startRecording{
UIBarButtonItem *stopButton = [[UIBarButtonItem alloc] initWithTitle:@"Stop" style:UIBarButtonItemStyleBordered target:self action:@selector(stopRecording)];
self.navigationItem.rightBarButtonItem = stopButton;
[stopButton release];
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;
}
// start recording
[recorder recordForDuration:(NSTimeInterval) 10];
}
- (void) stopRecording{
[recorder stop];
NSURL *url = [NSURL fileURLWithPath: recorderFilePath];
NSError *err = nil;
NSData *audioData = [NSData dataWithContentsOfFile:[url path] options: 0 error:&err];
if(!audioData)
NSLog(@"audio data: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
[editedObject setValue:[NSData dataWithContentsOfURL:url] forKey:editedFieldKey];
//[recorder deleteRecording];
NSFileManager *fm = [NSFileManager defaultManager];
err = nil;
[fm removeItemAtPath:[url path] error:&err];
if(err)
NSLog(@"File Manager: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
UIBarButtonItem *startButton = [[UIBarButtonItem alloc] initWithTitle:@"Record" style:UIBarButtonItemStyleBordered target:self action:@selector(startRecording)];
self.navigationItem.rightBarButtonItem = startButton;
[startButton release];
}
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag
{
NSLog (@"audioRecorderDidFinishRecording:successfully:");
// your actions here
}
回答by Shaybc
Although this is an answered question (and kind of old) i have decided to post my full working code for others that found it hard to find good working (out of the box) playing and recording example - including encoded, pcm, play via speaker, write to file here it is:
尽管这是一个已回答的问题（而且有点老），但我决定为其他人发布我的完整工作代码，他们发现很难找到好的工作（开箱即用）播放和录制示例 - 包括编码、pcm、通过扬声器播放，写入文件这里是：
AudioPlayerViewController.h:
AudioPlayerViewController.h：
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface AudioPlayerViewController : UIViewController {
AVAudioPlayer *audioPlayer;
AVAudioRecorder *audioRecorder;
int recordEncoding;
enum
{
ENC_AAC = 1,
ENC_ALAC = 2,
ENC_IMA4 = 3,
ENC_ILBC = 4,
ENC_ULAW = 5,
ENC_PCM = 6,
} encodingTypes;
}
-(IBAction) startRecording;
-(IBAction) stopRecording;
-(IBAction) playRecording;
-(IBAction) stopPlaying;
@end
AudioPlayerViewController.m:
AudioPlayerViewController.m：
#import "AudioPlayerViewController.h"
@implementation AudioPlayerViewController
- (void)viewDidLoad
{
[super viewDidLoad];
recordEncoding = ENC_AAC;
}
-(IBAction) startRecording
{
NSLog(@"startRecording");
[audioRecorder release];
audioRecorder = nil;
// Init audio with record capability
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:10];
if(recordEncoding == ENC_PCM)
{
[recordSettings setObject:[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey];
[recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];
[recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
[recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
}
else
{
NSNumber *formatObject;
switch (recordEncoding) {
case (ENC_AAC):
formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC];
break;
case (ENC_ALAC):
formatObject = [NSNumber numberWithInt: kAudioFormatAppleLossless];
break;
case (ENC_IMA4):
formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4];
break;
case (ENC_ILBC):
formatObject = [NSNumber numberWithInt: kAudioFormatiLBC];
break;
case (ENC_ULAW):
formatObject = [NSNumber numberWithInt: kAudioFormatULaw];
break;
default:
formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4];
}
[recordSettings setObject:formatObject forKey: AVFormatIDKey];
[recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];
[recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
[recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey];
[recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey];
}
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/recordTest.caf", [[NSBundle mainBundle] resourcePath]]];
NSError *error = nil;
audioRecorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSettings error:&error];
if ([audioRecorder prepareToRecord] == YES){
[audioRecorder record];
}else {
int errorCode = CFSwapInt32HostToBig ([error code]);
NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode);
}
NSLog(@"recording");
}
-(IBAction) stopRecording
{
NSLog(@"stopRecording");
[audioRecorder stop];
NSLog(@"stopped");
}
-(IBAction) playRecording
{
NSLog(@"playRecording");
// Init audio with playback capability
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/recordTest.caf", [[NSBundle mainBundle] resourcePath]]];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.numberOfLoops = 0;
[audioPlayer play];
NSLog(@"playing");
}
-(IBAction) stopPlaying
{
NSLog(@"stopPlaying");
[audioPlayer stop];
NSLog(@"stopped");
}
- (void)dealloc
{
[audioPlayer release];
[audioRecorder release];
[super dealloc];
}
@end
Hope this will help some of you guys.
希望这会帮助你们中的一些人。
回答by Avinash
回答by Avinash
Its really helpful. The only problem i had was the size of sound file created after recording. I needed to reduce the file size so i did some changes in settings.
它真的很有帮助。我遇到的唯一问题是录制后创建的声音文件的大小。我需要减小文件大小，因此我对设置进行了一些更改。
NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];
[recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
[recordSetting setValue:[NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
File size reduced from 360kb to just 25kb (2 seconds recording).
文件大小从 360kb 减少到仅 25kb（2 秒记录）。
回答by scourtaud
I've been trying to get this code to work for the last 2 hours and though it showed no error on the simulator, there was one on the device.
在过去的 2 个小时里，我一直试图让这段代码正常工作，虽然它在模拟器上没有显示错误，但在设备上却出现了错误。
Turns out, at least in my case that the error came from directory used (bundle) :
事实证明，至少在我的情况下，错误来自使用的目录（捆绑）：
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/recordTest.caf", [[NSBundle mainBundle] resourcePath]]];
It was not writable or something like this... There was no error except the fact that prepareToRecord failed...
它不可写或类似的东西......除了prepareToRecord失败的事实之外没有任何错误......
I therefore replaced it by :
因此，我将其替换为：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *recDir = [paths objectAtIndex:0];
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/recordTest.caf", recDir]]
It now Works like a Charm.
它现在就像一个魅力。
Hope this helps others.
希望这对其他人有帮助。
回答by swiftBoy
Great Thanks to @Massimo Cafaroand ShaybcI was able achieve below tasks
非常感谢@Massimo Cafaro和Shaybc我能够完成以下任务
in iOS 8 :
在 iOS 8 中：
Record audio & Save
Play Saved Recording
录制音频并保存
播放保存的录音
1.Add "AVFoundation.framework" to your project
1.将“AVFoundation.framework”添加到您的项目中
in .h file
在 .h 文件中
2.Add below import statement 'AVFoundation/AVFoundation.h'.
2.添加下面的导入语句'AVFoundation/AVFoundation.h'。
3.Define "AVAudioRecorderDelegate"
3.定义“AVAudioRecorderDelegate”
4.Create a layout with Record, Play buttons and their action methids
4.创建带有录制、播放按钮及其操作方法的布局
5.Define Recorder and Player etc.
5.定义记录器和播放器等。
Here is the complete example code which may help you.
这是完整的示例代码，可以帮助您。
ViewController.h
视图控制器.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface ViewController : UIViewController <AVAudioRecorderDelegate>
@property(nonatomic,strong) AVAudioRecorder *recorder;
@property(nonatomic,strong) NSMutableDictionary *recorderSettings;
@property(nonatomic,strong) NSString *recorderFilePath;
@property(nonatomic,strong) AVAudioPlayer *audioPlayer;
@property(nonatomic,strong) NSString *audioFileName;
- (IBAction)startRecording:(id)sender;
- (IBAction)stopRecording:(id)sender;
- (IBAction)startPlaying:(id)sender;
- (IBAction)stopPlaying:(id)sender;
@end
Then do the job in
然后在做工作
ViewController.m
视图控制器.m
#import "ViewController.h"
#define DOCUMENTS_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]
@interface ViewController ()
@end
@implementation ViewController
@synthesize recorder,recorderSettings,recorderFilePath;
@synthesize audioPlayer,audioFileName;
#pragma mark - View Controller Life cycle methods
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - Audio Recording
- (IBAction)startRecording:(id)sender
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *err = nil;
[audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
if(err)
{
NSLog(@"audioSession: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
return;
}
[audioSession setActive:YES error:&err];
err = nil;
if(err)
{
NSLog(@"audioSession: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
return;
}
recorderSettings = [[NSMutableDictionary alloc] init];
[recorderSettings setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[recorderSettings setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
[recorderSettings setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];
[recorderSettings setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[recorderSettings setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[recorderSettings setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
// Create a new audio file
audioFileName = @"recordingTestFile";
recorderFilePath = [NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, audioFileName] ;
NSURL *url = [NSURL fileURLWithPath:recorderFilePath];
err = nil;
recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recorderSettings error:&err];
if(!recorder){
NSLog(@"recorder: %@ %ld %@", [err domain], (long)[err code], [[err userInfo] description]);
UIAlertView *alert =
[[UIAlertView alloc] initWithTitle: @"Warning" message: [err localizedDescription] delegate: nil
cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
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];
return;
}
// start recording
[recorder recordForDuration:(NSTimeInterval) 60];//Maximum recording time : 60 seconds default
NSLog(@"Recroding Started");
}
- (IBAction)stopRecording:(id)sender
{
[recorder stop];
NSLog(@"Recording Stopped");
}
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag
{
NSLog (@"audioRecorderDidFinishRecording:successfully:");
}
#pragma mark - Audio Playing
- (IBAction)startPlaying:(id)sender
{
NSLog(@"playRecording");
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, audioFileName]];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.numberOfLoops = 0;
[audioPlayer play];
NSLog(@"playing");
}
- (IBAction)stopPlaying:(id)sender
{
[audioPlayer stop];
NSLog(@"stopped");
}
@end
回答by Deve Tester
for wav format below audio setting
用于音频设置下方的 wav 格式
NSDictionary *audioSetting = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:44100.0],AVSampleRateKey,
[NSNumber numberWithInt:2],AVNumberOfChannelsKey,
[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
[NSNumber numberWithInt:kAudioFormatLinearPCM],AVFormatIDKey,
[NSNumber numberWithBool:NO], AVLinearPCMIsFloatKey,
[NSNumber numberWithBool:0], AVLinearPCMIsBigEndianKey,
[NSNumber numberWithBool:NO], AVLinearPCMIsNonInterleaved,
[NSData data], AVChannelLayoutKey, nil];
ref: http://objective-audio.jp/2010/09/avassetreaderavassetwriter.html
参考：http: //objective-audio.jp/2010/09/avassetreaderavassetwriter.html
回答by Govind
This is from Multimedia programming guide...
- (IBAction) recordOrStop: (id) sender {
if (recording) {
[soundRecorder stop];
recording = NO;
self.soundRecorder = nil;
[recordOrStopButton setTitle: @"Record" forState:
UIControlStateNormal];
[recordOrStopButton setTitle: @"Record" forState:
UIControlStateHighlighted];
[[AVAudioSession sharedInstance] setActive: NO error:nil];
}
else {
[[AVAudioSession sharedInstance]
setCategory: AVAudioSessionCategoryRecord
error: nil];
NSDictionary *recordSettings =
[[NSDictionary alloc] initWithObjectsAndKeys:[NSNumber numberWithFloat: 44100.0], AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithInt: AVAudioQualityMax],
AVEncoderAudioQualityKey,
nil];
AVAudioRecorder *newRecorder =
[[AVAudioRecorder alloc] initWithURL: soundFileURL
settings: recordSettings
error: nil];
[recordSettings release];
self.soundRecorder = newRecorder;
[newRecorder release];
soundRecorder.delegate = self;
[soundRecorder prepareToRecord];
[soundRecorder record];
[recordOrStopButton setTitle: @"Stop" forState: UIControlStateNormal];
[recordOrStopButton setTitle: @"Stop" forState: UIControlStateHighlighted];
recording = YES;
}
}
回答by Jim Zimmerman
Ok so the answer I got helped me in the right direction and I am very thankful. It helped me figure out how to actually record on the iPhone, but I thought I would also include some helpful code I got from the iPhone Reference Library:
好的，所以我得到的答案在正确的方向上帮助了我，我非常感谢。它帮助我弄清楚如何在 iPhone 上实际录制，但我想我还会包含一些从 iPhone 参考库中获得的有用代码：
I used this code and added it to the avTouch example fairly easily. With the above code sample and the sample from the reference library, I was able to get this to work pretty good.
我使用了这段代码，并很容易地将它添加到 avTouch 示例中。使用上面的代码示例和参考库中的示例，我能够很好地工作。
回答by tico
In the following link you can find useful info about recording with AVAudioRecording. In this link in the first part "USing Audio" there is an anchor named “Recording with the AVAudioRecorder Class.” that leads you to the example.
在以下链接中，您可以找到有关使用 AVAudioRecording 进行录制的有用信息。在第一部分“使用音频”的这个链接中，有一个名为“使用 AVAudioRecorder 类录制”的锚点。这将引导您进入示例。
