Objective c 在iPhone中录制后如何保存音频文件?
嗨,我有记录剂量的代码,但我不知道如何保存,当我再次回来时,我可以再次播放相同的记录文件吗 我正在使用以下代码进行记录-Objective c 在iPhone中录制后如何保存音频文件?,objective-c,audio-recording,Objective C,Audio Recording,嗨,我有记录剂量的代码,但我不知道如何保存,当我再次回来时,我可以再次播放相同的记录文件吗 我正在使用以下代码进行记录- ----- -(IBAction) startRecording { NSLog(@"startRecording"); [audioRecorder release]; audioRecorder = nil; // Init audio with record capability AVAudioSession *audioSes
-----
-(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");
}
----
请让我知道如何保存此音频文件?所以我可以再次打开应用程序并播放录制的文件
谢谢为要保存的文件名附加一个有效路径。例如,获取应用程序文档目录的可写路径:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *recordDir = [paths objectAtIndex:0];
将此recordDir
附加到文件名:
NSString *recordFile = [recordDir stringByAppendingPathComponent: @"recordTest.caf"];
使用此完整路径获取以下内容的url:
NSURL *url = [NSURL fileURLWithPath:recordFile];
现在使用此url在ViewController中创建一个
AVAudioRecorder
已清理的viewLoad。m:
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
NSArray *documentsFolders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [[documentsFolders objectAtIndex:0] stringByAppendingPathComponent:@"Recording.aiff"];
[library writeVideoAtPathToSavedPhotosAlbum:[NSURL URLWithString:path] completionBlock:^(NSURL *assetURL, NSError *error){
/*notify of completion*/
NSLog(@"AssetURL: %@",assetURL);
NSLog(@"Error: %@",error);
if (!error) {
//video saved
[[self appDelegate] showAlertWithTitle:@"Audio Saved" message:@""];
}
else{
[[self appDelegate] showAlertWithTitle:@"Error" message:error.domain];
}
}];
-(无效)viewDidLoad
{
在ViewController.m中编辑的记录:
- (IBAction) record
{
NSError *error;
// Recording settings
NSMutableDictionary *settings = [NSMutableDictionary dictionary];
[settings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[settings setValue: [NSNumber numberWithFloat:8000.0] forKey:AVSampleRateKey];
[settings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
[settings setValue: [NSNumber numberWithInt: AVAudioQualityMax] forKey:AVEncoderAudioQualityKey];
NSArray *searchPaths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath_ = [searchPaths objectAtIndex: 0];
NSString *pathToSave = [documentPath_ stringByAppendingPathComponent:[self dateString]];
// File URL
NSURL *url = [NSURL fileURLWithPath:pathToSave];//FILEPATH];
//Save recording path to preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setURL:url forKey:@"Test1"];
[prefs synchronize];
// Create recorder
recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];
[recorder prepareToRecord];
[recorder record];
}
在ViewController中编辑播放。m:
-(IBAction)playBack
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];
//Load recording path from preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
temporaryRecFile = [prefs URLForKey:@"Test1"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
player.delegate = self;
[player setNumberOfLoops:0];
player.volume = 1;
[player prepareToPlay];
[player play];
}
- (NSString *) dateString
{
// return a formatted string for a file name
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"ddMMMYY_hhmmssa";
return [[formatter stringFromDate:[NSDate date]] stringByAppendingString:@".aif"];
}
并向ViewController.m添加了一个新的dateString方法:
-(IBAction)playBack
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];
//Load recording path from preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
temporaryRecFile = [prefs URLForKey:@"Test1"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
player.delegate = self;
[player setNumberOfLoops:0];
player.volume = 1;
[player prepareToPlay];
[player play];
}
- (NSString *) dateString
{
// return a formatted string for a file name
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"ddMMMYY_hhmmssa";
return [[formatter stringFromDate:[NSDate date]] stringByAppendingString:@".aif"];
}
现在,它可以通过NSUserdefaults加载上一个录制的文件,加载时使用:
//Load recording path from preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
temporaryRecFile = [prefs URLForKey:@"Test1"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
in(iAction)playBack.temporaryRecFile是我的ViewController类中的NSURL变量
声明为以下ViewController.h:
@interface SoundRecViewController : UIViewController <AVAudioSessionDelegate,AVAudioRecorderDelegate, AVAudioPlayerDelegate>
{
......
......
NSURL *temporaryRecFile;
AVAudioRecorder *recorder;
AVAudioPlayer *player;
}
......
......
@end
@界面SoundRecViewController:UIViewController
{
......
......
NSURL*临时记录文件;
AVAudioRecorder*录音机;
AVAudioPlayer*播放器;
}
......
......
@结束