[Openvortex-dev] Re: Alsa mix in HW

[Raymond]

snd_pcm_hardware_t of the sound cards will need to support

1) Hardware Mixing ( spatializing mono audio stream into 2, 4, 5.1, .. 
speakers

.channels_min  = 1
.formats =  SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U8

2) Doppler Effect ( Frequency shift by pitch )

.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000 or 
SNDRV_PCM_RATE_8000_44100

3) Recording API ( full duplex )

4) Mono/Stero Hint ( Playing stereo background music )

.channels_max >= 2

Do anyone have a list of the sound cards ( alsa driver ) which support 
the above features ?


Dino Puller wrote:

> Hi all,
>    here http://dino.e4a.it/openal-alsa you can find an implementation of 
> OpenAL library that can mix sources in HW. It's based on C.J.Purnell 
> openal-alsa-emu10k1 but in this one i've replaced all code relative to 
> emu10k1 processor, with a more compatible one, so now it's should works 
> with every sound card that supports multiple sub streams. It's not based 
> on OpenAL official tree because it's play too much with conversions to a 
> canonical format of samples witch slow down any trial to mix in 
> hardware. Don't expect too much it's only a first release but it's seems 
> to works.
>
>
> bye,
>    Dino Puller