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From: unruh on 24 Dec 2009 12:42
On 2009-12-24, despen(a)verizon.net <despen(a)verizon.net> wrote:
> The Natural Philosopher <tnp(a)invalid.invalid> writes:
>
>> For a debian linux system.
>>
>> I don't want the syntesizer bit..can take care of all that..just how
>> to hook C or indeed any other language into making a noise come out of
>> the speakers.
>
> For C:
>
> system("aplay sound.wav");

Which of course means that sound.wav has to already exist. This would be
pretty useless for playing, in real time, a sound that you had
synthesised. Synthesise the sound. Write it out to a .wav file, then run
aplay on it.

>
> similar facilities exist for most other languages.
From: despen on 24 Dec 2009 12:49
The Natural Philosopher <tnp(a)invalid.invalid> writes:

> despen(a)verizon.net wrote:
>> The Natural Philosopher <tnp(a)invalid.invalid> writes:
>>
>>> For a debian linux system.
>>>
>>> I don't want the syntesizer bit..can take care of all that..just how
>>> to hook C or indeed any other language into making a noise come out of
>>> the speakers.
>>
>> For C:
>>
>> system("aplay sound.wav");
>>
>> similar facilities exist for most other languages.
>
> I dont have a wav.
>
> I want to MAKE one perhaps.

Wavs are raw audio.

I don't think you've done a good job of describing what you
want to do.

You asked for the simplest way to make noise.

What I posted is about as simple as it gets.
There are APIs for OSS, ALSA, etc.

Why don't you try to explain what you really want?
From: despen on 24 Dec 2009 12:54
unruh <unruh(a)wormhole.physics.ubc.ca> writes:

> On 2009-12-24, despen(a)verizon.net <despen(a)verizon.net> wrote:
>> The Natural Philosopher <tnp(a)invalid.invalid> writes:
>>
>>> For a debian linux system.
>>>
>>> I don't want the syntesizer bit..can take care of all that..just how
>>> to hook C or indeed any other language into making a noise come out of
>>> the speakers.
>>
>> For C:
>>
>> system("aplay sound.wav");
>
> Which of course means that sound.wav has to already exist. This would be
> pretty useless for playing, in real time, a sound that you had
> synthesised. Synthesise the sound. Write it out to a .wav file, then run
> aplay on it.

Is that a requirement?

From the aplay man page:

If filename is not specified, the standard output or input is
used. The aplay utility accepts multiple filenames.

So it looks like aplay would be happy at the receiving end of a pipe.
From: Robert Riches on 24 Dec 2009 16:31
On 2009-12-24, The Natural Philosopher <tnp(a)invalid.invalid> wrote:
> For a debian linux system.
>
> I don't want the syntesizer bit..can take care of all that..just how to
> hook C or indeed any other language into making a noise come out of the
> speakers.
>
> Ideally would be a fragment of code that simply makes any noise on my
> ALSA based sound system.
>
> The only bit I found segfaults when it opens device 'default'

Here are a few snippets of a program I wrote several years
ago. It uses the OSS layer.


#include <sys/soundcard.h>

const char *dspnam; // name of DSP device
int dspfd; // DSP device file descriptor
int dspformat; // DSP format (AFMT_S16_LE)
int dspsamplebytes; // bytes per DSP sample
int dspstereo; // 1 for stereo (0 for mono)
int dspsamplerate; // data sample rate

/////////////////////////////////////////////////////////////////////////////
//
// The initdsp function initializes the DSP device. If there is a problem,
// this function does not return.
//
/////////////////////////////////////////////////////////////////////////////

void initdsp()
{

int sr;

#if DEBUG
printf("DEBUG: starting initdsp\n");
#endif // DEBUG

if (-1 == (dspfd = open( dspnam, O_WRONLY))) {
fprintf( stderr, "rrplay: cannot open DSP device %s\n", dspnam);
exit(1);
}
if (-1 == ioctl( dspfd, SNDCTL_DSP_SETFMT, &dspformat)) {
fprintf( stderr,
"rrplay: cannot set sample format for DSP device %s\n",
dspnam
);
exit(1);
}
if (-1 == ioctl( dspfd, SNDCTL_DSP_STEREO, &dspstereo)) {
fprintf( stderr,
"rrplay: cannot set sample channels for DSP device %s\n",
dspnam
);
exit(1);
}
sr = dspsamplerate; // save it
if (-1 == ioctl( dspfd, SNDCTL_DSP_SPEED, &dspsamplerate)) {
fprintf( stderr,
"rrplay: cannot set sample rate for DSP device %s\n",
dspnam
);
exit(1);
}
dspsamplerate = sr; // restore it

#if DEBUG
printf("DEBUG: finished initdsp\n");
#endif // DEBUG

}

void closeall()
{

#if DEBUG
printf("DEBUG: starting closeall\n");
#endif // DEBUG

if (-1 == close(dspfd)) {
fprintf( stderr, "rrplay: error closing DSP device.\n");
exit(1);
}
....

// In the main loop:

if (curbytes != write( dspfd, samplebuf, curbytes)) {
fprintf( stderr, "rrplay: error writing to DSP device.\n");
exit(1);
}

HTH

--
Robert Riches
spamtrap42(a)verizon.net
(Yes, that is one of my email addresses.)
From: Bud on 24 Dec 2009 23:38

To the OP
OK, you want to write code or a program that will write
the music for you and save it? I'm confused like
everyone else.:)

In KDE there is arts builder and in Gnome there are more
available. HTH
--
Bud
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