At Mon, 24 Nov 2003 16:11:57 +0100,
Alfons Adriaensen wrote:
>
> Hello list,
>
> I heard rumours of a new pcm API in the latest releases of ALSA.
> Searched on the ALSA site for 'new api', nothing found.
>
> Is there any document that describes this new API and the rationale
> for it ?
the doxygen output, i.e. online manual on web, is already based on the
new API.
basically, the difference is found only in some snd_pcm_hw_params_xxx
and snd_pcm_sw_params_xxx functions, such as
snd_pcm_hw_params_get_access().
these functions returned non-integer value as the value itself, e.g.
int snd_pcm_hw_params_get_access(const snd_pcm_hw_params_t *params);
with the new API, they return always the error code and store the
value in the given pointer uniformly, e.g.
int snd_pcm_hw_params_get_access(const snd_pcm_hw_params_t *params,
snd_pcm_access_t *access);
so that you can check the error condition safely.
btw, you can still use the old codes by defining
#define ALSA_PCM_OLD_HW_PARAMS_API
#define ALSA_PCM_OLD_SW_PARAMS_API
before inclusion of asound/asoundlib.h.
Takashi
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