Hi,
Thanks for those comments, especially the link to the 64 bit conversion guide.
The ASBD I’m using is defined:
size_t bytesPerSample = sizeof (AudioUnitSampleType);
stereoStreamFormat.mFormatID = kAudioFormatLinearPCM;
stereoStreamFormat.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical;
stereoStreamFormat.mBytesPerPacket = (UInt32)bytesPerSample;
stereoStreamFormat.mFramesPerPacket = (UInt32)1;
stereoStreamFormat.mBytesPerFrame = (UInt32)bytesPerSample;
stereoStreamFormat.mChannelsPerFrame = 2; // 2
indicates stereo
stereoStreamFormat.mBitsPerChannel = (UInt32)8 * (UInt32)bytesPerSample;
stereoStreamFormat.mSampleRate = graphSampleRate;
using jump to definition on AudioUnitSampleType goes to this line in
CoreAudioTypes.h:
CA_CANONICAL_DEPRECATED typedef SInt32 AudioUnitSampleType;
However, this is branched under CA_PREFER_FIXED_POINT. The other possibility
being Float 32. There is an earlier comment in CoreAudioTypes.h
> // CA_PREFER_FIXED_POINT is true on iOS, but this is no longer true in
> general. This symbol may
> // be removed in a future release.
I’m wondering about this because running CAShow on the audiograph shows the
mixer to aunt connection as: 2 ch, 0 hz, ‘lpcm’ 32-bit little-endian float,
deinterleaved
My graph structure on iOS is only the mixerAU connected to the ioUnit. I am
setting callbacks on the mixer input buses and scaling the number of busses
depending on how many files I need to play simultaneously. I am only setting
the ASBD on the mixer unit’s input scope.
regards,
rob
> On Jan 11, 2015, at 8:31 PM, Dave O'Neill <[email protected]> wrote:
>
> Are there any other audio units in your chain? Be sure to set the output
> ASBD of each audio unit to the input ASBD of the audio unit it is connected
> to (downstream). Just as a troubleshooting technique you can try putting
> AUConverters between various audio units to see if that fixes things. Maybe
> you could post your ASBD and we can spot an issue. Instead of using
> AudioUnitSampleType just find out what it is typedef'd to and substitute it
> with that ( you can just highlight it and "jump to definition" in Xcode).
> All of the iOS8 specific issues I've had were all traced back 32-64 bit
> issues. Here is a handy guide that points out some common gotchas:
> https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bit.html#//apple_ref/doc/uid/TP40013501-CH3-SW1
>
> <https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bit.html#//apple_ref/doc/uid/TP40013501-CH3-SW1>
>
>
> On Sun, Jan 11, 2015 at 5:00 PM, Matt Hart <[email protected]
> <mailto:[email protected]>> wrote:
> I haven't tested with m4a lossless, but I have played about 14 or so lossless
> wav simultaneously as well as that many m4a compressed files. They are all
> buffered though.
>
> On Jan 11, 2015, at 7:08 PM, Robert Carroll <[email protected]
> <mailto:[email protected]>> wrote:
>
>> Hi.
>>
>> Thanks. I am doing that with the same function call.
>>
>> Further investigation is pointing to some other issue. My code that reads
>> the ExtAudioFile objects is playing single m4a files, but not multiple files
>> set up on different mixer buses. I was testing with a single A440.if file
>> then with 3 m4a lossless files for C4, E4, G4 which should play
>> simultaneously.
>>
>> On iOS 7 it works, on iOS 8 I get a brief burst of vicious white noise.
>>
>> I’m inclined to think this is back to the storage type for the sample data.
>> Since, I haven’t found an answer to a replacement for the
>> AudioUnitSampleType on iOS, I had reverted my code to using that type.
>>
>> rob
>>
>>> On Jan 11, 2015, at 6:25 PM, Matt Hart <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> I use this with iOS 8 and 7 without any issues. Did you set the expected
>>> client data format onto the audio file property?
>>>
>>> status = ExtAudioFileSetProperty(_audioFile,
>>> kExtAudioFileProperty_ClientDataFormat, sizeof(_targetAudioDescription),
>>> &_targetAudioDescription);
>>>
>>>
>>> On Jan 11, 2015, at 1:56 PM, Robert Carroll <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>>> I am attempting to narrow down the options why my audiograph code is
>>>> failing on iOS 8.
>>>>
>>>> I am using ExtAudioFileRead to extract data from applelossless source
>>>> files and load structs set up for this purpose.
>>>> The buffers and audioData parts of the struct are typed as
>>>> AudioUnitSampleType.
>>>>
>>>> All of this works as it should on iOS’s up to 7.x. Running on iOS 8.1.2 I
>>>> can play aiff source files with this code but get distortion if I load the
>>>> m4a (lossless) files.
>>>>
>>>> What changed in iOS 8 with extaudiofile that would account for this issue?
>>>>
>>>> thanks
>>>>
>>>> rob
>>>>
>>>>
>>>> Robert Carroll
>>>> RSM Records
>>>> Toronto
>>>> http://www.rsmrecords.com <http://www.rsmrecords.com/>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Do not post admin requests to the list. They will be ignored.
>>>> Coreaudio-api mailing list ([email protected]
>>>> <mailto:[email protected]>)
>>>> Help/Unsubscribe/Update your Subscription:
>>>> https://lists.apple.com/mailman/options/coreaudio-api/matt%40matthart.com
>>>> <https://lists.apple.com/mailman/options/coreaudio-api/matt%40matthart.com>
>>>>
>>>> This email sent to [email protected] <mailto:[email protected]>
>>
>
>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Coreaudio-api mailing list ([email protected]
> <mailto:[email protected]>)
> Help/Unsubscribe/Update your Subscription:
> https://lists.apple.com/mailman/options/coreaudio-api/oneill707%40gmail.com
> <https://lists.apple.com/mailman/options/coreaudio-api/oneill707%40gmail.com>
>
> This email sent to [email protected] <mailto:[email protected]>
>
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list ([email protected])
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com
This email sent to [email protected]
