我有如下设置。
我想在录制音频时将录音设置更改为16Khz和16位。
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir
stringByAppendingPathComponent:@"sound.wav"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
} else
{
[audioRecorder prepareToRecord];
}
如何设置这些设置?
编辑问题:
感谢您的回复,我尝试了这些方法,但它对我不起作用,因为我的客户端正在将录制的语音(录制的语音,我以字节格式发送)发送到ASR引擎(自动语音识别)。我没有得到相同的响应(我得到的响应音频说“引号”)我发送的内容。客户说您没有以16KHz和16位采样率录制语音,这就是您获得该响应的原因。但我告诉他我发送给他的服务器的字节,他给了.wav文件,它正在播放完美。但是,如果他发送给ASR引擎的同一个,ASR引擎不接受录制的语音我发送的内容(他说ASR不会接受,因为你没有录制16KHz和16比特采样率的音频)。客户给出了以下回复。 (但是,我尝试了你提出的所有方法)
Filename: sv_SE_356985580762248932.wav
Folder: E:\developApp\TestappName\Mortionsn_dev\2nd-iteration\test_wfiles
File Type: 44100Hz, 16-bit, Stereo
Uncompressed Size: 1.63 MB (1,713,696 bytes)
File Format: Windows PCM
Windows PCM
Size on Disk: 1.63 MB (1,717,892 bytes)
Last Written (local): 3/11/2013 00:21:00.000
Length: 0:09.714
428,424 samples
使用以下答案编辑问题第二次:
稍后通过提供建议我将设置代码更改为:
NSMutableDictionary *recordSettings = [NSMutableDictionary dictionary];
[recordSettings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[recordSettings setValue: [NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];//8000.0
[recordSettings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[recordSettings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[recordSettings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[recordSettings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
[recordSettings setValue: [NSNumber numberWithInt: AVAudioQualityMax] forKey:AVEncoderAudioQualityKey];
答案 0 :(得分:3)
试试这个, 常规音频设置是,
AVFormatIDKey,
AVSampleRateKey,
AVNumberOfChannelsKey.
对于录音机
AVEncoderAudioQualityKey;
AVEncoderBitRateKey;
AVEncoderBitRatePerChannelKey;
AVEncoderBitDepthHintKey;
确保您已包含常规设置和录像机设置。
并将您的AVSampleRateKey
更改为16000.0
,
NSDictionary *recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatLinearPCM],
AVFormatIDKey
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:16000.0],
AVSampleRateKey,
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
nil];
答案 1 :(得分:2)
您现有的设置是44.1kHz和16位(假设上面已经有效),您需要更改的唯一一行是:
[NSNumber numberWithFloat:44100.0]
要:
[NSNumber numberWithFloat:16000.0]