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Re: ad1848 question
On Fri, 18 Apr 2008, Cherry G. Mathew wrote:
> I'm trying to understand the audio driver subsystem. Briefly skimming
> dev/ic/ad1848.c if find:
> 829 case 5:
> 830 strcpy(fp->name, AudioEslinear);
> 831 fp->encoding = AUDIO_ENCODING_SLINEAR;
> 832 fp->precision = 8;
> 833 fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
> 834 break;
> But ad1848_set_params() doesn't seem to check for
> AUDIO_ENCODING_SLINEAR to pass down to a filter hook.
I'm not sure what this means
but, I suppose you read audio(4) and audio(9) ?
> Am I missing something, or is that a bug ? If the encoding is marked
> as EMULATED, does userspace respond in a fashion that obviates the
> need to support the encoding emulation or something like that ?
I think it relates to mmap'ed files. if its marked EMULATED then it won't
work properly there, see AUDIO_GETENC in audio(4)
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