migrating from old to new alsa-api

migrating from old to new alsa-api

[barat]

Hi,
i need some clarifying about how the defines ALSA_PCM_OLD_HW_PARAMS_API 
etc. behaves.
for alsa-1.x its clear that if the app uses the new api i have to define 
ALSA_PCM_NEW_HW_PARAMS_API, but what is for the case if i have an app with 
the new api and the user uses only alsa9? is alsa1.x then backwards 
compatible?

regards

Zsolt Barat

________________________________________
do interactive tv on www.remote-tv.de


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Re: migrating from old to new alsa-api

[Takashi Iwai]

At Thu, 22 Apr 2004 15:57:13 +0200 (CEST),
barat@medien.uni-weimar.de wrote:
> 
> Hi,
> i need some clarifying about how the defines ALSA_PCM_OLD_HW_PARAMS_API 
> etc. behaves.
> for alsa-1.x its clear that if the app uses the new api i have to define 
> ALSA_PCM_NEW_HW_PARAMS_API,

no, with ALSA 1.x, the new API is chosen as default.

> but what is for the case if i have an app with 
> the new api and the user uses only alsa9?

if user recompiles the code with the old API, he has to add
ALSA_PCM_OLD_* defines.

>  is alsa1.x then backwards 
> compatible?

yes.  the alsa-lib contains the versioned symbols for the backward
comptibility.


Takashi


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Re: migrating from old to new alsa-api

[James Courtier-Dutton]

barat@medien.uni-weimar.de wrote:
> Hi,
> i need some clarifying about how the defines ALSA_PCM_OLD_HW_PARAMS_API 
> etc. behaves.
> for alsa-1.x its clear that if the app uses the new api i have to define 
> ALSA_PCM_NEW_HW_PARAMS_API, but what is for the case if i have an app with 
> the new api and the user uses only alsa9? is alsa1.x then backwards 
> compatible?
> 
> regards
> 
> Zsolt Barat
> 


ALSA_PCM_NEW_HW_PARAMS_API etc. is for use with alsa0.9.x
That define is assumed to be the default for alsa1.x.x

ALSA_PCM_OLD_HW_PARAMS_API is for use with alsa1.x.x to make it behave 
like "alsa0.9.x without the ALSA_PCM_NEW_HW_PARAMS_API".

Summary: -
To make your code work with bother alsa 0.9.x and 1.x.x, use 
ALSA_PCM_NEW_HW_PARAMS_API etc. and then write your code to the 1.x.x api.



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