[alsa-devel] SALSA and aplay
gineera at aspect135.co.uk
Tue Jul 17 13:33:36 CEST 2007
On Monday 16 July 2007 13:30, you wrote:
> At Mon, 16 Jul 2007 13:40:23 +0100,
> Alan Horstmann wrote:
> > Quick questions:
> > 1. Does SALSA provide everything needed by aplay?
> Most but not everything. The missing features are:
> - snd_pcm_mmap_read*/write*() (corresponding to -M option)
> - device listing (namehint)
Thanks. Presumably that explains 'undeclared' error for 'snd_devname_t' and
'snd_config' when linking aplay code to salsa. I commented out all
applicable bits and it is OK.
Can salsa-lib be installed at the same time as alsa-lib? There seems to be
conflicts. For now I have uninstalled and installed alternately.
I have very crudely hacked the aplay code and included it as a function in
code to make a simple key-press play a set file. Linking -lasound this seems
to work fine. However, linking -lsalsa results in the file playing too fast,
but not as much as double.
As my experimental system has ice1712 card, I am having to use a 10 track WAV
file S32_LE as I think that is the only format supported, the card working
with 24-bits loose fitted in 32-bits. Is that right? Is there still
something that alsa-lib is doing to the data that salsa doesn't? My example
wav file was recorded using standard aplay, and has meaningful sound just on
the first 4 tracks, which appear correctly in pcm out 1-4 (visible in
envy24control), at the correct level, just too fast. The included aplay
try3.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, Channels 10
when begining to play.
Can you give any pointers to issues to investigate etc or things to consider?
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