Re: Easy synth question (follow-up)
Re: Easy synth question (follow-up)
- Subject: Re: Easy synth question (follow-up)
- From: "email@hidden" <email@hidden>
- Date: Mon, 11 Apr 2011 22:13:52 +0200 (CEST)
Same topic as before but now I found the property I was looking for, i.e.
kAudioDevicePropertyBufferFrameSize.
So let me rephrase my question:
I'm getting the default output device ID with
kAudioHardwarePropertyDefaultOutputDevice, the sample rate with
kAudioDevicePropertyNominalSampleRate and the buffer size (in frames) with
kAudioDevicePropertyBufferFrameSize.
My prototype synth works fine with the Mac built-in output device, but will
this approach work with any sound card / external interface?
Thanks in advance for any help on this, I'm just trying to tackle the basics
of Core Audio.
Regards,
Eric
>To further clarify: this synthesizer is using a canonical linear PCM stereo
>format (L+R samples, both float; so frame size is fixed to 8 bytes). I'd
expect
>any device to be able to deal with it. Internally I have my own SR/buffer
size -
>dependent code.
>
>I'm getting the default output device with
>kAudioHardwarePropertyDefaultOutputDevice, the buffer size with
>kAudioDevicePropertyBufferSize and the nominal SR with
>kAudioDevicePropertyNominalSampleRate.
>
>Regards,
>Eric
>
>
>>I'm working on an easy synth project that uses a callback to generate audio
>>through the default output device.
>>I know how to determine the default output device ID, buffer size and
>nominal
>>SR through the AudioObjectGetPropertyData API.
>>
>>QUESTION: since my synth uses float samples, can I assume the device will
>>accept a packet size of 8 bytes (4 per channel) so that my inner loop in
the
>>callback will have a number if iterations equal to bufferSize / 8 ?
>>
>>In the old days I used to determine the "Bytes per Packet" with
>>AudioDeviceGetProperty / kAudioDevicePropertyStreamFormat but now that API
>is
>>deprecated and kAudioDevicePropertyStreamFormat is not recognized by
>>AudioObjectGetPropertyData.
>>
>>I want to keep it simple if possible: will this approach work with hi-end
>>audio interfaces like Motu / Aprogee and similar?
>>
>>Any help appreciated, thanks.
>>
>>Regards,
>>Eric
>>
>>
>>
>>
>
>
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