You need to set mFormatFlags
> On Nov 27, 2016, at 12:56 PM, Andreas Falkenhahn <[email protected]>
> wrote:
>
> Why does the following call to AudioConverterNew() fail on iOS 10?
> On macOS Sierra it's working fine.
>
> AudioStreamBasicDescription in, out;
>
> memset(&in, 0, sizeof(AudioStreamBasicDescription));
> memset(&out, 0, sizeof(AudioStreamBasicDescription));
>
> in.mFormatID = kAudioFormatLinearPCM;
in.mFormatFlags = kAudioFormatFlagsNativeEndian |
kAudioFormatFlagIsSignedInteger;
> in.mChannelsPerFrame = 1;
> in.mSampleRate = 11025;
> in.mBitsPerChannel = 16;
> in.mFramesPerPacket = 1;
> in.mBytesPerFrame = 2;
> in.mBytesPerPacket = 2;
>
> out.mFormatID = kAudioFormatLinearPCM;
> out.mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
> out.mBitsPerChannel = 32;
> out.mChannelsPerFrame = 2;
> out.mFramesPerPacket = 1;
> out.mBytesPerPacket = asbd.mBytesPerFrame = sizeof(Float32);
> out.mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
>
> ret = AudioConverterNew(&in, &out, &converter);
>
> The call to AudioConverterNew() returns 'fmt?' in 'ret'. Since other
> input formats work, I think the problem is with the particular input
> format in the example above.
>
> I agree, 11025hz, 16 bit and mono is rather uncommon but isn't that
> the point of audio converters, i.e. to be able to convert exotic
> audio formats to common audio formats supported by the hardware?
>
> So could this be a bug in iOS? As I said, the same code works fine on
> macOS Sierra but it doesn't work on iOS 10.
>
> --
> Best regards,
> Andreas Falkenhahn mailto:[email protected]
>
>
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James McCartney
Apple CoreAudio
[email protected]
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