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
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