Empty file created with ExtAudioFileWrite
Empty file created with ExtAudioFileWrite
- Subject: Empty file created with ExtAudioFileWrite
- From: Lee Falin <email@hidden>
- Date: Sat, 15 Jul 2006 16:54:10 -0400
I'm trying to write out some data that I have recorded from the
internal microphone to a file. I want the format to be Apple IMA4.
I'm using a combination of MTCoreAudio and ExtAudioFile APIs and I
have gotten things to work pretty well.
I can record audio, and use MTCoreAudio to play it back, however when
I write the file with ExtAudioFileWrite, the file is created, there
are no errors from any of the ExtAudioFile function calls, and
Quicktime can open and play the file. However the file contains no
data. (ie it has an audio track of duration 00:00)
I know there is audio in the buffer, because I can play it back via
MTCoreAudio.
Here is the code that I am using to try and write the file:
//Get file path
NSString *savePath = [[NSString alloc] initWithString:@"~/"];
NSString *fileNameString = [[NSString alloc]
initWithString:@"test2.aiff"];
const char *recordFileName = [[savePath stringByExpandingTildeInPath]
cString];
FSRef parentDir;
CFStringRef filename = (CFStringRef)fileNameString;
Boolean isDir = YES;
FSPathMakeRef((const UInt8 *)recordFileName,&parentDir,&isDir);
//Set output format
AudioStreamBasicDescription outdesc;
UInt32 size;
outdesc.mSampleRate = 44100;
outdesc.mFormatID = kAudioFormatAppleIMA4;
outdesc.mChannelsPerFrame = 2;
size = sizeof(outdesc);
AudioFormatGetProperty(kAudioFormatProperty_FormatInfo, 0, NULL,
&size, &outdesc);
//Write the file
ExtAudioFileRef outRef;
OSErr test1 = ExtAudioFileCreateNew
(&parentDir,filename,kAudioFileAIFCType,&outdesc,nil,&outRef);
OSErr test2 = ExtAudioFileWrite(outRef,sizeof(outputData),outputData);
OSErr test3 = ExtAudioFileDispose(outRef);
Can someone tell me what I am missing? I realize that I'm probably
doing this wrong:
OSErr test2 = ExtAudioFileWrite(outRef,sizeof(outputData),outputData);
But I wasn't sure whre to get the number of frames from.
Thanks,
lee
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