[MPlayer-dev-eng] [PATCH] Mac OS X Audio with AudioUnits and AudioToolbox format converters

[Nicolas Plourde]

On 29-May-05, at 10:03 AM, Chris Roccati wrote:


> Hello,
> after some fiddling, it became apparent (to me, atleast) that using  
> the "raw" CoreAudio for audio output is not going to work in all  
> cases, and "fixing" it is troublesome: for example changing the  
> sample rate takes a random amount of time, because all the  
> applications involved in audio output must be notified, all the  
> conversion filter chains must be rebuilt and so on. The way  
> ao_macosx.c handles that simply can't be fixed.
>
> This patch proposes a move from the "raw" CoreAudio to the AudioUnit 
> +AudioToolbox frameworks.
> The change provides several advantages, for example a better  
> cooperation with other audio playing applications and (potential)  
> usage of hardware accelerated sample rate and sample format  
> conversion.
>
> (Atleast with my hardware case, the "clicks" in AC3 conversion are  
> gone too.)
>
> The changed files are:
>
> libao2/ao_macosx.c
> use AudioUnits instead CoreAudio and provide sample rate and format  
> conversion via AudioToolbox
>
> configure
> added the -framework AudioUnits and -framework AudioToolbox to the  
> list of required frameworks.
>
>
> <ao_macosx_audiounits.patch>
>
>

commited.

====
Nicolas Plourde <nicolas.plourde at sympatico.ca>