SDL 1.2.6 and ALSA 1.0.x

SDL Development
1

Hi SDL users,

I’m trying to compile SDL 1.2.6 against ALSA 1.0.2/1.0.1 and it fails:

SDL_alsa_audio.c: In function ALSA_OpenAudio': SDL_alsa_audio.c:272: too few arguments to functionsnd_pcm_hw_params_get_channels’
SDL_alsa_audio.c:282: warning: passing arg 3 of
snd_pcm_hw_params_set_rate_near' makes pointer from integer without a cast SDL_alsa_audio.c:292: warning: passing arg 3 ofsnd_pcm_hw_params_set_period_size_near’ makes pointer from integer without
a cast
SDL_alsa_audio.c:294: warning: passing arg 3 of
`snd_pcm_hw_params_set_periods_near’ makes pointer from integer without a cast
make[3]: *** [SDL_alsa_audio.lo] Error 1

IIRC, there have been some API changes around snd_pcm_hw_params, maybe since
1.0.x, I can’t really remember when. Obviously the compilation error is a API issue, so
my question is: is SDL’s CVS sync’ed w/ recent ALSA API or is there another way to
compile 1.2.6 against ALSA 1.0.x?

TIA,–
wwp

2

wwp wrote:

Hi SDL users,

I’m trying to compile SDL 1.2.6 against ALSA 1.0.2/1.0.1 and it fails:

SDL_alsa_audio.c: In function ALSA_OpenAudio': SDL_alsa_audio.c:272: too few arguments to functionsnd_pcm_hw_params_get_channels’
SDL_alsa_audio.c:282: warning: passing arg 3 of
snd_pcm_hw_params_set_rate_near' makes pointer from integer without a cast SDL_alsa_audio.c:292: warning: passing arg 3 ofsnd_pcm_hw_params_set_period_size_near’ makes pointer from integer without
a cast
SDL_alsa_audio.c:294: warning: passing arg 3 of
`snd_pcm_hw_params_set_periods_near’ makes pointer from integer without a cast
make[3]: *** [SDL_alsa_audio.lo] Error 1

IIRC, there have been some API changes around snd_pcm_hw_params, maybe since
1.0.x, I can’t really remember when. Obviously the compilation error is a API issue, so
my question is: is SDL’s CVS sync’ed w/ recent ALSA API or is there another way to
compile 1.2.6 against ALSA 1.0.x?

Yup, SDL cvs fixes this issue.

Stephane

3

ALSA 1.0 changed to the “new” PCM API by default. SDL never changed over.

The quick and dirty fix is

#define ALSA_PCM_OLD_HW_PARAMS_API
#define ALSA_PCM_OLD_SW_PARAMS_API
before
#include <alsa/asoundlib.h>On Thu, Jan 29, 2004 at 10:25:47PM +0100, wwp wrote:

SDL_alsa_audio.c: In function ALSA_OpenAudio': SDL_alsa_audio.c:272: too few arguments to functionsnd_pcm_hw_params_get_channels’

–
Glenn Maynard

4

Hello Glenn Maynard,On Thu, 29 Jan 2004 16:53:08 -0500 Glenn Maynard <g_sdl at zewt.org> wrote:

On Thu, Jan 29, 2004 at 10:25:47PM +0100, wwp wrote:

SDL_alsa_audio.c: In function ALSA_OpenAudio': SDL_alsa_audio.c:272: too few arguments to functionsnd_pcm_hw_params_get_channels’

ALSA 1.0 changed to the “new” PCM API by default. SDL never changed over.

The quick and dirty fix is

#define ALSA_PCM_OLD_HW_PARAMS_API
#define ALSA_PCM_OLD_SW_PARAMS_API
before
#include <alsa/asoundlib.h>

Thanx for the workaround!

Regards,

–
wwp

5

Hello Stephane Marchesin,On Thu, 29 Jan 2004 23:03:03 +0100 Stephane Marchesin <stephane.marchesin at wanadoo.fr> wrote:

wwp wrote:

Hi SDL users,

I’m trying to compile SDL 1.2.6 against ALSA 1.0.2/1.0.1 and it fails:

SDL_alsa_audio.c: In function ALSA_OpenAudio': SDL_alsa_audio.c:272: too few arguments to functionsnd_pcm_hw_params_get_channels’
SDL_alsa_audio.c:282: warning: passing arg 3 of
snd_pcm_hw_params_set_rate_near' makes pointer from integer without a cast SDL_alsa_audio.c:292: warning: passing arg 3 ofsnd_pcm_hw_params_set_period_size_near’ makes pointer from integer without
a cast
SDL_alsa_audio.c:294: warning: passing arg 3 of
`snd_pcm_hw_params_set_periods_near’ makes pointer from integer without a cast
make[3]: *** [SDL_alsa_audio.lo] Error 1

IIRC, there have been some API changes around snd_pcm_hw_params, maybe since
1.0.x, I can’t really remember when. Obviously the compilation error is a API issue, so
my question is: is SDL’s CVS sync’ed w/ recent ALSA API or is there another way to
compile 1.2.6 against ALSA 1.0.x?

Yup, SDL cvs fixes this issue.

And thanx for the info!

Regards,

–
wwp