Re: Encoding Mono IMA4
Re: Encoding Mono IMA4
- Subject: Re: Encoding Mono IMA4
- From: "tahome izwah" <email@hidden>
- Date: Sat, 29 Jul 2006 23:16:36 +0200
Sorry, forget my last comment I goofed - it appears I didn't set the
channel number right. Works fine now.
Thanks again
--th
2006/7/29, tahome izwah <email@hidden>:
I don't think that this really is the problem, I am using your
settings and it still doesn't work for me...
Btw. how do you calculate mFramesPerPacket and mBytesPerPacket? These
numbers don't make any sense to me.
Thanks
--th
2006/7/29, Lee Falin <email@hidden>:
> Doh, found the problem.
>
> The output format that I was passing to ExtAudioFileCreateNew was
> correct, but the format that I was setting for
> ExtAudioFileSetProperty for kExtAudioFileProperty_ClientDataFormat
> had two channels instead of one. Apparently the converter can convert
> between bitrates and encoding format, but not between mono and
> stereo. (For example I write to file with a sampling rate of 11000,
> but my client format is 44100)
>
> Here are the final settings I used for IMA4 mono:
>
> AudioStreamBasicDescription outputFormat;
> outputFormat.mChannelsPerFrame = 1;
> outputFormat.mSampleRate = 11000;
> outputFormat.mFormatID = kAudioFormatAppleIMA4;
> outputFormat.mFormatFlags = 0;
> outputFormat.mBitsPerChannel = 0;
> outputFormat.mBytesPerFrame = 0;
> outputFormat.mFramesPerPacket = 64;
> outputFormat.mBytesPerPacket = 68;
>
>
> Thanks for everyone's help,
>
> Lee
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