also the buffer could be used by a hardware sound card that share only a part of the memory with the system, so the data must be copied in the memory accessible by the sound card.
renan On 15/12/2016 08:06, Bram Bos wrote: > Thanks James, I will try that. > > > But I'm wondering what the rationale here is because it seems > counterintuitive. > > Obviously the buffers have been allocated before starting the audio > rendering thread, and the "mDataByteSize" property is a description of > these buffers. Feels strange to change this description on the fly > depending on the Audio Unit calls... That's what the "inNumberFrames" > parameter in the AURenderBlock is for, isn't it? > > > Or am I supposed to allocate new buffers for every render call (which > also feels very wrong)? > > > Thanks, > > Bram > > ------------------------------------------------------------------------ > *From:* James McCartney <[email protected]> > *Sent:* Wednesday, December 14, 2016 8:33:50 PM > *To:* Bram Bos > *Cc:* [email protected] > *Subject:* Re: ExtAudioFileWrite: insz - invalid number of frames? (iOS) > > >> On Dec 13, 2016, at 9:12 AM, Bram Bos <[email protected] >> <mailto:[email protected]>> wrote: >> >> I'm creating a perfectly looping audio file by writing the >> output buffers of an AudioUnit to an ExtAudioFile. >> All buffers are 1024 frames, except the last one, which is 68 frames. >> >> I'm writing the buffers (in an offline rendering loop) to the file using >> >> result = ExtAudioFileWrite( outputStreamFile, numberOfFrames, >> renderBufferList ); >> >> When attempting to write the last, smaller, buffer this function call >> returns "*1768846202*" which translates into "insz" indicating an >> invalid buffer size. >> >> What exactly is invalid about this size? The buffer is big enough and >> the error message is returned regardless of whether I render exactly >> 68 frames or the usual 1024 frames. > > insz means that the buffer list you passed in has a mDataByteSize that > is not equal to numberOfFrames * sizeof(the-sample-type), or if your > client format is interleaved then numberOfFrames * numberOfChannels * > sizeof(the-sample-type) > > mDataByteSize has to match, it is not allowed to be greater than. > > >> >> What am I missing here? >> >> _______________________________________________ >> 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/jmccartney%40apple.com >> >> This email sent to [email protected] <mailto:[email protected]> > > James McCartney > Apple CoreAudio > [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/renan%40aestesis.org > > This email sent to [email protected] > -- renan jegouzo software developer aestesis.net _______________________________________________ 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]
