31 May
2009
31 May
'09
5:21 p.m.
Ziv Haziz schrieb:
Hi All,
i'm seeking an advise on the preferred way to support a dedicated DSP
chip under ALSA.
The system is an embedded system constructed on a dual core chip – one
core is ARM vanlia and the other is a dedicated DSP core.
The DSP core is capable of both playing both encoded streams (mp3, wma,
various voice coders) and of course PCM streams.
the codec (a2d, d2a) are connected to DSP.
I think having a alsa support for the PCM is step one. To allow applications to
benefit from the codecs,
you could write wrappers for gstreamer. But basically the later depends if you
have existing applications already.
If then you need to support the interfaces they are using.
Stefan
I looking for an elegant design to hide the DSP under the ALSA sysem and
I have several ideas and would like to get your advise:
1. use LADSPA to make the DSP look as a plug-in for both control and
data – what I don't know is if LADSPA forces me to return data to
the ALSA for sending it to the kernel drivers
2. use the LADSPA to make the DSP control only and make another
kernel driver for the audio data pass – is it possible? There can
be a sync problem between the commands and the time the data will
arrive? Will this support JACKD ?
I'm open to other suggestions as well,
Thanks in advance
Ziv
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