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iPhone 上即时语音播放的最佳 API？

发布于 2024-11-07 20:48:37 字数 204 浏览 2 评论 0原文

我想做的事情：

iPhone就继续监听语音输入通道
一旦用户说话（录音音量>一定级别），
一旦用户停止说话（录音音量静音一秒）， iPhone就开始录音
（录音音量静音一秒）
iPhone回放录音

哪个iPhone我应该研究 API 或示例代码吗？谢谢！

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遗失的美好 2024-11-14 20:48:37

你需要的是 AVFoundation。要使用它：

将 AVFoundation.framework 添加到您的项目中，
使您的视图控制器符合 AVAudioRecorderDelegate、AVAudioPlayerDelegate，一个用于录制，另一个用于播放

以下代码用于录制：

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *err = nil;
[audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
[audioSession setActive:YES error:&err];
NSMutableDictionary *settings = [[NSMutableDictionary alloc] init];
[settings setValue: [NSNumber numberWithInt:kAudioFormatMPEGLayer3] forKey:AVFormatIDKey];
[settings setValue: [NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
[settings setValue: [NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];
[settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
NSURL *url = [NSURL fileURLWithPath: filepath];
recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:settings error:&err];
[settings release];
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];

另外，您需要实现 - (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) 记录器成功:(BOOL)标志释放记录器。

What you need is AVFoundation. To use it:

Adding AVFoundation.framework to your project
conform your view controller to AVAudioRecorderDelegate, AVAudioPlayerDelegate, one for recording, another one for playing

Following piece of code is for recording:

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
NSError *err = nil;
[audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
[audioSession setActive:YES error:&err];
NSMutableDictionary *settings = [[NSMutableDictionary alloc] init];
[settings setValue: [NSNumber numberWithInt:kAudioFormatMPEGLayer3] forKey:AVFormatIDKey];
[settings setValue: [NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
[settings setValue: [NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];
[settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
NSURL *url = [NSURL fileURLWithPath: filepath];
recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:settings error:&err];
[settings release];
[recorder setDelegate:self];
[recorder prepareToRecord];
[recorder record];

Addtionally, you need to implement - (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) recorder successfully:(BOOL)flag to release the recorder.

Please see more details here: http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/00_Introduction.html#//apple_ref/doc/uid/TP40010188

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