No Sound Output

Timm_Murray · November 1, 2005, 5:10pm

I have a simple program for playing wav files:----
#include <stdio.h>
#include <SDL.h>
#include <SDL_mixer.h>

int main(int argc, char **argv)
{
?char *file = argv[1];
?int done = 0;
?Mix_Chunk *wav;
?int ret;

?SDL_Init( SDL_INIT_AUDIO );
?
?ret = Mix_OpenAudio( 44100, AUDIO_S16SYS, 2, 4096 );
?if( 0 > ret ) {
? printf( “Error opening audio: %s\n”, Mix_GetError() );
? exit(1);
?}

?printf( “Playing file: %s\n”, file );
?wav = Mix_LoadWAV( file );
?ret = Mix_PlayChannel( -1, wav, -1 );
?if( 0 > ret ) {
? printf( “Error playing audio: %s\n”, Mix_GetError() );
?}
?else {
? printf( “Played on channel %i\n”, ret );
?}
?SDL_Delay( 50 );

?Mix_FreeChunk( wav );
?Mix_CloseAudio();
?SDL_Quit();
?return 0;
}

This is compiled with “gcc sdl-config --libs -lSDL_mixer -I/usr/include/SDL
-o play_sound play_sound_mixer.c”. ?‘sdl-config --libs’ gives
"-L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -lpthread". ?On running, it
shows:

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0

However, nothing comes out of the speakers. ?I hear the sound when using
wavplay, so sound works fine on my system. ?This is on Linux w/ALSA, running
SDL 1.2.6 and SDL_mixer 1.2.6.
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Rasmus_Neckelmann · November 1, 2005, 7:30pm

You only gives your program 50 millisecs to play the sound before you quit.
Try with a while(Mix_Playing(-1) > 0); instead of the delay and see
what happens.On 11/1/05, Timm Murray wrote:

I have a simple program for playing wav files:

#include <stdio.h>
#include <SDL.h>
#include <SDL_mixer.h>

int main(int argc, char **argv)
{
char *file = argv[1];
int done = 0;
Mix_Chunk *wav;
int ret;

SDL_Init( SDL_INIT_AUDIO );

ret = Mix_OpenAudio( 44100, AUDIO_S16SYS, 2, 4096 );
if( 0 > ret ) {
printf( “Error opening audio: %s\n”, Mix_GetError() );
exit(1);
}

printf( “Playing file: %s\n”, file );
wav = Mix_LoadWAV( file );
ret = Mix_PlayChannel( -1, wav, -1 );
if( 0 > ret ) {
printf( “Error playing audio: %s\n”, Mix_GetError() );
}
else {
printf( “Played on channel %i\n”, ret );
}
SDL_Delay( 50 );

Mix_FreeChunk( wav );
Mix_CloseAudio();
SDL_Quit();
return 0;
}

[snip]
However, nothing comes out of the speakers. I hear the sound when using
wavplay, so sound works fine on my system. This is on Linux w/ALSA, running
SDL 1.2.6 and SDL_mixer 1.2.6.

–
Regards,
Rasmus Neckelmann

Bill_Kendrick · November 1, 2005, 7:54pm

> ?ret = Mix_PlayChannel( -1, wav, -1 ); > ?SDL_Delay( 50 ); > > ?Mix_FreeChunk( wav ); > ?Mix_CloseAudio(); > ?SDL_Quit(); > ?return 0; > However, nothing comes out of the speakers. ?I hear the sound when using > wavplay, so sound works fine on my system. ?This is on Linux w/ALSA, running > SDL 1.2.6 and SDL_mixer 1.2.6.

Uh, you don’t give it much time (50ms) to play before quitting.
Maybe you should wait until it’s done playing?

Of course, in case it does turn out to be some other issue, do other
SDL-based apps play sound properly?

-bill!On Tue, Nov 01, 2005 at 12:10:44PM -0500, Timm Murray wrote:

John_Popplewell · November 1, 2005, 8:14pm

I have a simple program for playing wav files:

#include <stdio.h>
#include <SDL.h>
#include <SDL_mixer.h>

int main(int argc, char **argv)
{
?char *file = argv[1];
?int done = 0;
?Mix_Chunk *wav;
?int ret;

?SDL_Init( SDL_INIT_AUDIO );
?
?ret = Mix_OpenAudio( 44100, AUDIO_S16SYS, 2, 4096 );
?if( 0 > ret ) {
? printf( “Error opening audio: %s\n”, Mix_GetError() );
? exit(1);
?}

?printf( “Playing file: %s\n”, file );
?wav = Mix_LoadWAV( file );
?ret = Mix_PlayChannel( -1, wav, -1 );
?if( 0 > ret ) {
? printf( “Error playing audio: %s\n”, Mix_GetError() );
?}
?else {
? printf( “Played on channel %i\n”, ret );
?}
?SDL_Delay( 50 );

?Mix_FreeChunk( wav );
?Mix_CloseAudio();
?SDL_Quit();
?return 0;
}

This is compiled with “gcc sdl-config --libs -lSDL_mixer -I/usr/include/SDL
-o play_sound play_sound_mixer.c”. ?‘sdl-config --libs’ gives
"-L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -lpthread". ?On running, it
shows:

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0

However, nothing comes out of the speakers. ?I hear the sound when using
wavplay, so sound works fine on my system. ?This is on Linux w/ALSA, running
SDL 1.2.6 and SDL_mixer 1.2.6.

Hi,

SDL_Delay()'s argument is in milliseconds, so you are playing the first
0.05 seconds of the file,

cheers,
John.On Tue, Nov 01, 2005 at 12:10:44PM -0500, Timm Murray wrote:

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

Chris_Nystrom · November 1, 2005, 8:27pm

50 ms is not very long. You might want to give yourself more time to hear it.

ChrisOn 11/1/05, Timm Murray wrote:

SDL_Delay( 50 );

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

Chris_Nystrom · November 1, 2005, 8:30pm

Also, does this tutorial code work for you?

http://gpwiki.org/index.php/C:Playing_a_WAV_Sound_File_With_SDL_mixer

If so, then you know you have a code problem, if not then it is
probably a sysem setup problem.

ChrisOn 11/1/05, Timm Murray wrote:

I have a simple program for playing wav files:

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

Timm_Murray · November 1, 2005, 9:50pm

<>

SDL_Delay( 50 );
<>
You only gives your program 50 millisecs to play the sound before you quit.
Try with a while(Mix_Playing(-1) > 0); instead of the delay and see
what happens.

I’ve replaced the SDL_Delay line with the while loop above. I’m now getting:On Tuesday 01 November 2005 01:30 pm, Rasmus Neckelmann wrote:

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

There are a few seconds between the ‘Played on channel’ line and the segfault,
so it’s probably happening after the while loop.
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Timm_Murray · November 1, 2005, 9:51pm

The code opens a blank window for a few seconds, closes it, then segfaults.
No sound is played.
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URL: http://lists.libsdl.org/pipermail/sdl-libsdl.org/attachments/20051101/82c4afd5/attachment.pgpOn Tuesday 01 November 2005 02:30 pm, Chris Nystrom wrote:

On 11/1/05, Timm Murray <@Timm_Murray> wrote:

I have a simple program for playing wav files:

Also, does this tutorial code work for you?

http://gpwiki.org/index.php/C:Playing_a_WAV_Sound_File_With_SDL_mixer

If so, then you know you have a code problem, if not then it is
probably a sysem setup problem.

Chris_Nystrom · November 2, 2005, 2:43am

How did you compile it? On linux I used:

$ gcc SDL_PlaySound.c -o SDL_PlaySound sdl-config --cflags --libs -lSDL_mixer

It compiles fine for me. When I run it, it starts up and opens a blank
window, and plays a sound, and then exits.

If you can not get this known good code to work, then I believe you
have a setup issue.

ChrisOn 11/1/05, Timm Murray wrote:

Also, does this tutorial code work for you?
http://gpwiki.org/index.php/C:Playing_a_WAV_Sound_File_With_SDL_mixer

If so, then you know you have a code problem, if not then it is
probably a sysem setup problem.

The code opens a blank window for a few seconds, closes it, then segfaults.
No sound is played.

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

Timm_Murray · November 2, 2005, 4:30am

Also, does this tutorial code work for you?
http://gpwiki.org/index.php/C:Playing_a_WAV_Sound_File_With_SDL_mixer

If so, then you know you have a code problem, if not then it is
probably a sysem setup problem.

The code opens a blank window for a few seconds, closes it, then
segfaults. No sound is played.

How did you compile it? On linux I used:

$ gcc SDL_PlaySound.c -o SDL_PlaySound sdl-config --cflags --libs
-lSDL_mixer

Yes, that’s how I compiled it.

It compiles fine for me. When I run it, it starts up and opens a blank
window, and plays a sound, and then exits.

If you can not get this known good code to work, then I believe you
have a setup issue.

Probably. Where should I start looking?
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URL: http://lists.libsdl.org/pipermail/sdl-libsdl.org/attachments/20051101/2725a536/attachment.pgpOn Tuesday 01 November 2005 08:43 pm, Chris Nystrom wrote:

On 11/1/05, Timm Murray <@Timm_Murray> wrote:

Chris_Nystrom · November 2, 2005, 6:35am

Do regular non-SDL_mixer apps work? I assume yes.

You might try un-installing SDL_mixer and the developer RPM and
re-installing them.

ChrisOn 11/1/05, Timm Murray wrote:

If you can not get this known good code to work, then I believe you
have a setup issue.

Probably. Where should I start looking?

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

Timm_Murray · November 2, 2005, 4:32pm

If you can not get this known good code to work, then I believe you
have a setup issue.

Probably. Where should I start looking?

Do regular non-SDL_mixer apps work? I assume yes.

Yup.

You might try un-installing SDL_mixer and the developer RPM and
re-installing them.

I’m on Gentoo. I emerged SDL_mixer again, but it still segfaults.
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URL: http://lists.libsdl.org/pipermail/sdl-libsdl.org/attachments/20051102/3aa97f60/attachment.pgpOn Wednesday 02 November 2005 12:35 am, Chris Nystrom wrote:

On 11/1/05, Timm Murray <@Timm_Murray> wrote:

Sauc_Jedi · November 2, 2005, 6:23pm

Hello

I wonder if there exists any tutorial for installing SDL on Windows,
compiling it, etc.

Thanks!

Bill_Kendrick · November 2, 2005, 7:20pm

What does your code look like now? Before, you had:

printf( “Playing file: %s\n”, file );
wav = Mix_LoadWAV( file );
ret = Mix_PlayChannel( -1, wav, -1 );
if( 0 > ret ) {
printf( “Error playing audio: %s\n”, Mix_GetError() );

Are you sure the sound file loaded? (You don’t check if “wav == NULL”)

-bill!On Wed, Nov 02, 2005 at 11:32:14AM -0500, Timm Murray wrote:

I’m on Gentoo. I emerged SDL_mixer again, but it still segfaults.

Bill_Kendrick · November 2, 2005, 7:21pm

Does the FAQ cover it?

http://www.libsdl.org/faq.php?action=listentries&category=4

-bill!On Wed, Nov 02, 2005 at 07:23:00PM +0100, Sauc Jedi wrote:

Hello

I wonder if there exists any tutorial for installing SDL on Windows,
compiling it, etc.

Chris_Nystrom · November 2, 2005, 7:34pm

Something like this?

http://gpwiki.org/index.php/SDL:Tutorials:Setup

ChrisOn 11/2/05, Sauc Jedi wrote:

Hello

I wonder if there exists any tutorial for installing SDL on Windows,
compiling it, etc.

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

Tom_Daranchuc · November 2, 2005, 8:30pm

Hello

I have seen people mention this topic before on here about how you
cannot run SDL_PollEvent() in a thread separate from the one that
created the window. I am wondering if you guys will ever change it so
you can have input separate from video?

-Tom

Brian_Barrett · November 2, 2005, 9:03pm

IIRC its a limitation of the Operating Systems SDL wants to run under.

windows i think specifically.On 11/2/05, Tom Daranchuc wrote:

Hello

I have seen people mention this topic before on here about how you
cannot run SDL_PollEvent() in a thread separate from the one that
created the window. I am wondering if you guys will ever change it so
you can have input separate from video?

-Tom

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

Timm_Murray · November 2, 2005, 10:38pm

I’m on Gentoo. I emerged SDL_mixer again, but it still segfaults.

What does your code look like now? Before, you had:

printf( “Playing file: %s\n”, file );
wav = Mix_LoadWAV( file );
ret = Mix_PlayChannel( -1, wav, -1 );
if( 0 > ret ) {
printf( “Error playing audio: %s\n”, Mix_GetError() );On Wednesday 02 November 2005 01:20 pm, Bill Kendrick wrote:
On Wed, Nov 02, 2005 at 11:32:14AM -0500, Timm Murray wrote:

    printf( "Playing file: %s\n", file );
    wav = Mix_LoadWAV( file );
    if(! wav) {
            printf( "Can't load wav file: %s\n", Mix_GetError() );
            exit(1);
    }
    
    ret = Mix_PlayChannel( -1, wav, -1 );
    if( 0 > ret ) { 
            printf( "Error playing audio: %s\n", Mix_GetError() );
    }
    else {
            printf( "Played on channel %i\n", ret );
    }
    while(Mix_Playing(-1) > 0);

Compiled with: gcc sdl-config --libs --cflags -lSDL_mixer -o play_sound
play_sound_mixer.c

Gives:

$ ./play_sound …/data/sound/plasma.wav
Playing file: …/data/sound/plasma.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

The ‘wavplay’ program on my system plays the sound successfully.
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John_Popplewell · November 3, 2005, 3:04am

I’m on Gentoo. I emerged SDL_mixer again, but it still segfaults.

What does your code look like now? Before, you had:

printf( “Playing file: %s\n”, file );
wav = Mix_LoadWAV( file );
ret = Mix_PlayChannel( -1, wav, -1 );
if( 0 > ret ) {
printf( “Error playing audio: %s\n”, Mix_GetError() );
    printf( "Playing file: %s\n", file );
    wav = Mix_LoadWAV( file );
    if(! wav) {
            printf( "Can't load wav file: %s\n", Mix_GetError() );
            exit(1);
    }
    
    ret = Mix_PlayChannel( -1, wav, -1 );
    if( 0 > ret ) { 
            printf( "Error playing audio: %s\n", Mix_GetError() );
    }
    else {
            printf( "Played on channel %i\n", ret );
    }
    while(Mix_Playing(-1) > 0);
Compiled with: gcc sdl-config --libs --cflags -lSDL_mixer -o play_sound
play_sound_mixer.c

Gives:

$ ./play_sound …/data/sound/plasma.wav
Playing file: …/data/sound/plasma.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

The ‘wavplay’ program on my system plays the sound successfully.
Hi,

I’m on Gentoo. Your program builds and works here. It doesn’t handle
bad/missing file paths well, but it does play. I’d recommend checking the
return value from SDL_Init(). Something like this:

ret = SDL_Init(SDL_INIT_AUDIO);
if ( 0 > ret ) {
    printf("Error initialising SDL: %s\n", SDL_GetError());
    exit(1);
}

What do you get if you do:

ldd ./play_sound
linux-gate.so.1 => (0xffffe000)
libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0xb7f69000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7f31000)
libSDL_mixer-1.2.so.0 => /usr/lib/libSDL_mixer-1.2.so.0 (0xb7ece000)
libc.so.6 => /lib/libc.so.6 (0xb7d9d000)
libstdc++.so.5 => //usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5 (0xb7ce3000)
libm.so.6 => /lib/libm.so.6 (0xb7cbe000)
libdl.so.2 => /lib/libdl.so.2 (0xb7cb9000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb7bed000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb7bdf000)
libvga.so.1 => /usr/lib/libvga.so.1 (0xb7b71000)
libaa.so.1 => /usr/lib/libaa.so.1 (0xb7b56000)
/lib/ld-linux.so.2 (0xb7fe9000)
libvorbisfile.so.3 => /usr/lib/libvorbisfile.so.3 (0xb7b4f000)
libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0xb7b26000)
libogg.so.0 => /usr/lib/libogg.so.0 (0xb7b21000)
libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0xb7ac9000)
libgcc_s.so.1 => /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libgcc_s.so.1 (0xb7ac1000)
libslang.so.1 => /usr/lib/libslang.so.1 (0xb7a4d000)

What about if you do ldd on the fullpath to libSDL_mixer? I get:

ldd /usr/lib/libSDL_mixer-1.2.so.0
linux-gate.so.1 => (0xffffe000)
libvorbisfile.so.3 => /usr/lib/libvorbisfile.so.3 (0xb7f96000)
libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0xb7f6d000)
libogg.so.0 => /usr/lib/libogg.so.0 (0xb7f68000)
libsmpeg-0.4.so.0 => /usr/lib/libsmpeg-0.4.so.0 (0xb7f10000)
libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0xb7e90000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7e59000)
libc.so.6 => /lib/libc.so.6 (0xb7d28000)
libm.so.6 => /lib/libm.so.6 (0xb7d02000)
libstdc++.so.5 => /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libstdc++.so.5 (0xb7c48000)
libdl.so.2 => /lib/libdl.so.2 (0xb7c44000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb7b78000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb7b6a000)
libvga.so.1 => /usr/lib/libvga.so.1 (0xb7afb000)
libaa.so.1 => /usr/lib/libaa.so.1 (0xb7ae0000)
/lib/ld-linux.so.2 (0x80000000)
libgcc_s.so.1 => /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.5-20050130/libgcc_s.so.1 (0xb7ad8000)
libslang.so.1 => /usr/lib/libslang.so.1 (0xb7a64000)

I had a problem with SDL_Mixer and using an external libmikmod (the default on
Gentoo). It kept trying to create files (‘music.raw’?) on the hardrive, and if
it couldn’t then SDL audio initialisation failed. I manually rebuilt SDL_mixer
whilst disabling use of an external libmikmod.

Hope that helps,

cheers,
John.On Wed, Nov 02, 2005 at 05:38:32PM -0500, Timm Murray wrote:

On Wednesday 02 November 2005 01:20 pm, Bill Kendrick wrote:

On Wed, Nov 02, 2005 at 11:32:14AM -0500, Timm Murray wrote:

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

No Sound Output

?Mix_FreeChunk( wav ); ?Mix_CloseAudio(); ?SDL_Quit(); ?return 0; }

$ ./play_sound …/data/sound/explosion.wav Playing file: …/data/sound/explosion.wav Played on channel 0

Mix_FreeChunk( wav ); Mix_CloseAudio(); SDL_Quit(); return 0; }

?Mix_FreeChunk( wav ); ?Mix_CloseAudio(); ?SDL_Quit(); ?return 0; }

$ ./play_sound …/data/sound/explosion.wav Playing file: …/data/sound/explosion.wav Played on channel 0

$ ./play_sound …/data/sound/explosion.wav Playing file: …/data/sound/explosion.wav Played on channel 0 Fatal signal: Segmentation Fault (SDL Parachute Deployed)

$ ./play_sound …/data/sound/plasma.wav Playing file: …/data/sound/plasma.wav Played on channel 0 Fatal signal: Segmentation Fault (SDL Parachute Deployed)

$ ./play_sound …/data/sound/plasma.wav Playing file: …/data/sound/plasma.wav Played on channel 0 Fatal signal: Segmentation Fault (SDL Parachute Deployed)

?Mix_FreeChunk( wav );
?Mix_CloseAudio();
?SDL_Quit();
?return 0;
}

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0

Mix_FreeChunk( wav );
Mix_CloseAudio();
SDL_Quit();
return 0;
}

?Mix_FreeChunk( wav );
?Mix_CloseAudio();
?SDL_Quit();
?return 0;
}

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0

$ ./play_sound …/data/sound/explosion.wav
Playing file: …/data/sound/explosion.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

$ ./play_sound …/data/sound/plasma.wav
Playing file: …/data/sound/plasma.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

$ ./play_sound …/data/sound/plasma.wav
Playing file: …/data/sound/plasma.wav
Played on channel 0
Fatal signal: Segmentation Fault (SDL Parachute Deployed)