Re: canonical audio format on mac osx 10.8
Re: canonical audio format on mac osx 10.8
- Subject: Re: canonical audio format on mac osx 10.8
- From: Chris Adamson <email@hidden>
- Date: Thu, 01 Nov 2012 14:08:54 -0400
If mBitsPerChannel == 32, and mChannelsPerFrame = 2, then I think mBytesPerFrame should be 8. Same for mBytesPerPacket.
-Chris
On Nov 1, 2012, at 1:34 PM, Joel Reymont <email@hidden> wrote:
> I keep getting the 'fmt?' error from the following code on the Mac.
>
> What am I doing wrong?
>
> Thanks, Joel
>
> P.S. I'm actually getting 4096 x 2 (channels) samples at a time over
> the network but that's another story.
>
> ---
> OSStatus OpenAudioFile(ExtAudioFileRef& file)
> {
> AudioStreamBasicDescription desc{};
>
> desc.mSampleRate = 131072;
> desc.mFormatID = kAudioFormatLinearPCM;
> desc.mFormatFlags = kAudioFormatFlagIsFloat
> | kAudioFormatFlagsNativeEndian
> | kAudioFormatFlagIsPacked
> | kAudioFormatFlagIsNonInterleaved;
> desc.mBytesPerPacket = 4;
> desc.mFramesPerPacket = 1;
> desc.mBitsPerChannel = 32;
> desc.mBytesPerFrame = 4;
> desc.mChannelsPerFrame = 2;
>
> AudioChannelLayout layout{};
> layout.mChannelLayoutTag = kAudioChannelLayoutTag_UseChannelBitmap;
> layout.mChannelBitmap = kAudioChannelBit_Left | kAudioChannelBit_Right;
> // layout.mNumberChannelDescriptions = 0;
>
> //FillOutASBDForLPCM(desc, 131072, 2, 32, 32, true, false, true);
> CFStringRef ref;
> ref = CFStringCreateWithCString(kCFAllocatorDefault,
> "/tmp/lanxi.caff",
> kCFStringEncodingUTF8);
> CFURLRef destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
> ref,
> kCFURLPOSIXPathStyle,
> false);
> return ExtAudioFileCreateWithURL(destinationURL,
> kAudioFileCAFType,
> &desc,
> &layout,
> kAudioFileFlags_EraseFile,
> &file);
> //ExtAudioFileWrite(file, mNumberFrames, inBL);
> }
>
> --------------------------------------------------------------------------
> for hire: mac osx device driver ninja. kernel, usb and coreaudio drivers
> ---------------------+------------+---------------------------------------
> http://wagerlabs.com | @wagerlabs | http://www.linkedin.com/in/joelreymont
> ---------------------+------------+---------------------------------------
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