Resources for “Introduction to Sound Programming with ALSA”

ALSA Project: www.alsa-project.org

Alternate Sound APIs:

aRts and CSL: www.arts-project.org

JACK: jackit.sourceforge.net

OpenAL: www.openal.org/home

SDL: www.libsdl.org

Sound and MIDI Software for Linux: linux-sound.org

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do u know how to solve this e

hardik's picture

do u know how to solve this error i got the same error
plz tell me how to link the programme with alsa library
hardik

simple capture program doesn't record nothing...

Marco Antonio Lopez Trinidad's picture

I typed the simple playing program and I made some tests, it works almost with no problems.

However, this is not the case for the simple capture program. It is typed like the article says, I compiled and no errors, but the file where the result is redirected has in appearence not information. I played the content of this file with the simple playing. I have tried with different inputs, the CD and the MIC on the KMix interface without many success. The same happens with the 6735l4.c file, there is any idea???
The version of the ALSA API is 1.0.8rc2.
thanx,

--marco.

Am I missing something?

Geoff's picture

I expected to find the listings from the article, transcribed for compillation by the lazy. But no?

problems compiling listing 1

Anonymous's picture

I get this when I try to run listing 1. I am using alsa version 1.0.6
Do I need to link something?

> /tmp/ccY117TW.o(.text+0x47): In function `main':
> : undefined reference to `snd_pcm_stream_name'
> /tmp/ccY117TW.o(.text+0x84): In function `main':
> : undefined reference to `snd_pcm_access_name'
> /tmp/ccY117TW.o(.text+0xc1): In function `main':
> : undefined reference to `snd_pcm_format_name'
> /tmp/ccY117TW.o(.text+0xd0): In function `main':
> : undefined reference to `snd_pcm_format_description'
> /tmp/ccY117TW.o(.text+0xdd): In function `main':
> : undefined reference to `snd_pcm_format_name'
> /tmp/ccY117TW.o(.text+0x11e): In function `main':
> : undefined reference to `snd_pcm_subformat_description'
> /tmp/ccY117TW.o(.text+0x12b): In function `main':
> : undefined reference to `snd_pcm_subformat_name'
> /tmp/ccY117TW.o(.text+0x16c): In function `main':

Re: problems compiling listing 1

Anonymous's picture

use -lasound

Re: Resources for Introduction to Sound Programming with ALSA

Anonymous's picture

I am using ALSA version 1.6a and seem to be having problems with listing2,3 and 4. I keep getting the error "unable to set hw parameters: Invalid argument -22" I added the -22 by printing the rc value. The error is caused by the snd_pcm_hw_params( handle, params) call to write the parameters to the driver. I looked at the ALSA documentation and can't seem to find a breakdown of the params struct. It would help if I knew what parameter are bad.

Re: Resources for Introduction to Sound Programming with ALSA

Anonymous's picture

the variable dir needs to be initialized to 0. This will make at least listing 2 work. I suspect that it will make listings 3 and 4 work as well.

d!

Re: Resources for Introduction to Sound Programming with ALSA

Anonymous's picture

I have a similar problem, with listing four only. It seems that may Soundblaster live does not accept a sampling rate of 44100. However, a smpling rate of 88200 is accepted. (I have not got any sound yet, but that may be due to other things.)

Re: Resources for Introduction to Sound Programming with ALSA

Anonymous's picture

I'm struggling with the same problem.

Help!

Philip

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