src/audio/alsa/SDL_alsa_audio.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 02 Mar 2004 12:49:16 +0000
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Date: Sun, 29 Feb 2004 15:14:22 +0200 From: Martin_Storsj Subject: Dynamic loading of ALSA I recently discovered that SDL can dynamically load ESD and aRts, and made a patch which adds this same functionality to ALSA. The update for configure.in isn't too good (it should e.g. look for libasound.so in other directories than /usr/lib), because I'm not too good at shellscripting and autoconf. The reason for using dlfcn.h and dlopen instead of SDL_LoadLibrary and SDL_LoadFunction is that libasound uses versioned symbols, and it is necessary to load the correct version using dlvsym. This isn't probably any real portability issue, because ALSA is linux-only.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* Allow access to a raw mixing buffer */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "SDL_audio.h"
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#include "SDL_error.h"
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#include "SDL_audiomem.h"
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#include "SDL_audio_c.h"
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#include "SDL_timer.h"
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#include "SDL_alsa_audio.h"
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#ifdef ALSA_DYNAMIC
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#define __USE_GNU
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#include <dlfcn.h>
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#include "SDL_name.h"
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#include "SDL_loadso.h"
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#else
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#define SDL_NAME(X)	X
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#endif
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/* The tag name used by ALSA audio */
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#define DRIVER_NAME         "alsa"
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/* The default ALSA audio driver */
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#define DEFAULT_DEVICE	"default"
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/* Audio driver functions */
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static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void ALSA_WaitAudio(_THIS);
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static void ALSA_PlayAudio(_THIS);
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static Uint8 *ALSA_GetAudioBuf(_THIS);
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static void ALSA_CloseAudio(_THIS);
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#ifdef ALSA_DYNAMIC
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static const char *alsa_library = ALSA_DYNAMIC;
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static void *alsa_handle = NULL;
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static int alsa_loaded = 0;
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static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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static const char *(*SDL_NAME(snd_strerror))(int errnum);
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static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
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static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
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static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params);
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static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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static snd_pcm_uframes_t (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int *dir);
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static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir);
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static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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#define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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static struct {
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	const char *name;
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	void **func;
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} alsa_functions[] = {
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	{ "snd_pcm_open",	(void**)&SDL_NAME(snd_pcm_open)		},
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	{ "snd_pcm_close",	(void**)&SDL_NAME(snd_pcm_close)	},
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	{ "snd_pcm_writei",	(void**)&SDL_NAME(snd_pcm_writei)	},
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	{ "snd_pcm_resume",	(void**)&SDL_NAME(snd_pcm_resume)	},
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	{ "snd_pcm_prepare",	(void**)&SDL_NAME(snd_pcm_prepare)	},
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	{ "snd_pcm_drain",	(void**)&SDL_NAME(snd_pcm_drain)	},
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	{ "snd_strerror",	(void**)&SDL_NAME(snd_strerror)		},
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	{ "snd_pcm_hw_params_sizeof",		(void**)&SDL_NAME(snd_pcm_hw_params_sizeof)		},
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	{ "snd_pcm_hw_params_any",		(void**)&SDL_NAME(snd_pcm_hw_params_any)		},
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	{ "snd_pcm_hw_params_set_access",	(void**)&SDL_NAME(snd_pcm_hw_params_set_access)		},
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	{ "snd_pcm_hw_params_set_format",	(void**)&SDL_NAME(snd_pcm_hw_params_set_format)		},
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	{ "snd_pcm_hw_params_set_channels",	(void**)&SDL_NAME(snd_pcm_hw_params_set_channels)	},
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	{ "snd_pcm_hw_params_get_channels",	(void**)&SDL_NAME(snd_pcm_hw_params_get_channels)	},
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	{ "snd_pcm_hw_params_set_rate_near",	(void**)&SDL_NAME(snd_pcm_hw_params_set_rate_near)	},
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	{ "snd_pcm_hw_params_set_period_size_near",	(void**)&SDL_NAME(snd_pcm_hw_params_set_period_size_near)	},
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	{ "snd_pcm_hw_params_set_periods_near",	(void**)&SDL_NAME(snd_pcm_hw_params_set_periods_near)	},
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	{ "snd_pcm_hw_params",	(void**)&SDL_NAME(snd_pcm_hw_params)	},
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	{ "snd_pcm_nonblock",	(void**)&SDL_NAME(snd_pcm_nonblock)	},
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};
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static void UnloadALSALibrary(void) {
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	if (alsa_loaded) {
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/*		SDL_UnloadObject(alsa_handle);*/
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		dlclose(alsa_handle);
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		alsa_handle = NULL;
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		alsa_loaded = 0;
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	}
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}
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static int LoadALSALibrary(void) {
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	int i, retval = -1;
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/*	alsa_handle = SDL_LoadObject(alsa_library);*/
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	alsa_handle = dlopen(alsa_library,RTLD_NOW);
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	if (alsa_handle) {
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		alsa_loaded = 1;
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		retval = 0;
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		for (i = 0; i < SDL_TABLESIZE(alsa_functions); i++) {
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/*			*alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
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			*alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
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			if (!*alsa_functions[i].func) {
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				retval = -1;
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				UnloadALSALibrary();
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				break;
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			}
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		}
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	}
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	return retval;
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}
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#else
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static void UnloadALSALibrary(void) {
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	return;
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}
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static int LoadALSALibrary(void) {
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	return 0;
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}
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#endif /* ALSA_DYNAMIC */
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static const char *get_audio_device()
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{
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	const char *device;
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	device = getenv("AUDIODEV");	/* Is there a standard variable name? */
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	if ( device == NULL ) {
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		device = DEFAULT_DEVICE;
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	}
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	return device;
0
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}
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/* Audio driver bootstrap functions */
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static int Audio_Available(void)
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{
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	int available;
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	int status;
0
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	snd_pcm_t *handle;
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	available = 0;
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	if (LoadALSALibrary() < 0) {
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		return available;
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	}
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	status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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	if ( status >= 0 ) {
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		available = 1;
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        	SDL_NAME(snd_pcm_close)(handle);
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	}
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	UnloadALSALibrary();
0
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	return(available);
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}
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static void Audio_DeleteDevice(SDL_AudioDevice *device)
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{
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	free(device->hidden);
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	free(device);
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	UnloadALSALibrary();
0
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}
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static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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{
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	SDL_AudioDevice *this;
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	/* Initialize all variables that we clean on shutdown */
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	LoadALSALibrary();
0
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	this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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	if ( this ) {
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		memset(this, 0, (sizeof *this));
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		this->hidden = (struct SDL_PrivateAudioData *)
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				malloc((sizeof *this->hidden));
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	}
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	if ( (this == NULL) || (this->hidden == NULL) ) {
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		SDL_OutOfMemory();
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		if ( this ) {
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			free(this);
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		}
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		return(0);
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	}
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	memset(this->hidden, 0, (sizeof *this->hidden));
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	/* Set the function pointers */
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	this->OpenAudio = ALSA_OpenAudio;
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	this->WaitAudio = ALSA_WaitAudio;
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	this->PlayAudio = ALSA_PlayAudio;
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	this->GetAudioBuf = ALSA_GetAudioBuf;
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	this->CloseAudio = ALSA_CloseAudio;
0
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	this->free = Audio_DeleteDevice;
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	return this;
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   230
}
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AudioBootStrap ALSA_bootstrap = {
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	DRIVER_NAME, "ALSA 0.9 PCM audio",
0
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	Audio_Available, Audio_CreateDevice
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};
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/* This function waits until it is possible to write a full sound buffer */
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static void ALSA_WaitAudio(_THIS)
0
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{
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	/* Check to see if the thread-parent process is still alive */
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	{ static int cnt = 0;
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		/* Note that this only works with thread implementations 
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		   that use a different process id for each thread.
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		*/
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		if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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			if ( kill(parent, 0) < 0 ) {
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				this->enabled = 0;
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			}
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		}
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	}
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}
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static void ALSA_PlayAudio(_THIS)
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{
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	int           status;
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	int           sample_len;
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	signed short *sample_buf;
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	sample_len = this->spec.samples;
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	sample_buf = (signed short *)mixbuf;
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	while ( sample_len > 0 ) {
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		status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
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		if ( status < 0 ) {
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			if ( status == -EAGAIN ) {
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				SDL_Delay(1);
354
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   266
				continue;
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diff changeset
   267
			}
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diff changeset
   268
			if ( status == -ESTRPIPE ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   269
				do {
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					SDL_Delay(1);
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					status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354
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diff changeset
   272
				} while ( status == -EAGAIN );
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diff changeset
   273
			}
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diff changeset
   274
			if ( status < 0 ) {
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				status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354
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diff changeset
   276
			}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   277
			if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   278
				/* Hmm, not much we can do - abort */
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diff changeset
   279
				this->enabled = 0;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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   280
				return;
0
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   281
			}
356
a1e54d1ba16f *** empty log message ***
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diff changeset
   282
			continue;
0
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diff changeset
   283
		}
354
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diff changeset
   284
		sample_buf += status * this->spec.channels;
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diff changeset
   285
		sample_len -= status;
0
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   286
	}
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diff changeset
   287
}
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parents:
diff changeset
   288
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   289
static Uint8 *ALSA_GetAudioBuf(_THIS)
0
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diff changeset
   290
{
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   291
	return(mixbuf);
0
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diff changeset
   292
}
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diff changeset
   293
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   294
static void ALSA_CloseAudio(_THIS)
0
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diff changeset
   295
{
354
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diff changeset
   296
	if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   297
		SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   298
		mixbuf = NULL;
0
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diff changeset
   299
	}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   300
	if ( pcm_handle ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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   301
		SDL_NAME(snd_pcm_drain)(pcm_handle);
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diff changeset
   302
		SDL_NAME(snd_pcm_close)(pcm_handle);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   303
		pcm_handle = NULL;
0
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parents:
diff changeset
   304
	}
74212992fb08 Initial revision
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diff changeset
   305
}
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parents:
diff changeset
   306
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   307
static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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diff changeset
   308
{
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   309
	int                  status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   310
	snd_pcm_hw_params_t *params;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   311
	snd_pcm_format_t     format;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
   312
	snd_pcm_uframes_t    frames;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   313
	Uint16               test_format;
0
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diff changeset
   314
74212992fb08 Initial revision
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diff changeset
   315
	/* Open the audio device */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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diff changeset
   316
	status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
   317
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
   318
		SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   319
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   320
	}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   321
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   322
	/* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
   323
	snd_pcm_hw_params_alloca(&params);
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   324
	status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   325
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   326
		SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   327
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   328
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   329
	}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   330
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   331
	/* SDL only uses interleaved sample output */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   332
	status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   333
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   334
		SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   335
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
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parents:
diff changeset
   336
		return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
   337
	}
74212992fb08 Initial revision
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parents:
diff changeset
   338
74212992fb08 Initial revision
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parents:
diff changeset
   339
	/* Try for a closest match on audio format */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   340
	status = -1;
0
74212992fb08 Initial revision
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parents:
diff changeset
   341
	for ( test_format = SDL_FirstAudioFormat(spec->format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   342
	      test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   343
		switch ( test_format ) {
0
74212992fb08 Initial revision
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parents:
diff changeset
   344
			case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   345
				format = SND_PCM_FORMAT_U8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   346
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   347
			case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   348
				format = SND_PCM_FORMAT_S8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   350
			case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   351
				format = SND_PCM_FORMAT_S16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   352
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
			case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   354
				format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
			case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   357
				format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
			case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   360
				format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
			default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   363
				format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
		}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   366
		if ( format != 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   367
			status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   368
		}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   369
		if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   370
			test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   372
	}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   373
	if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   374
		SDL_SetError("Couldn't find any hardware audio formats");
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   375
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   376
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   378
	spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   379
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   380
	/* Set the number of channels */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   381
	status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, params, spec->channels);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   382
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   383
		status = SDL_NAME(snd_pcm_hw_params_get_channels)(params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   384
		if ( (status <= 0) || (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   385
			SDL_SetError("Couldn't set audio channels");
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   386
			ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   387
			return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   388
		}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   389
		spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   390
	}
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   392
	/* Set the audio rate */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   393
	status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, params, spec->freq, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   394
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   395
		SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   396
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   397
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   398
	}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   399
	spec->freq = status;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   401
	/* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   402
	frames = spec->samples;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   403
	frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, params, frames, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   404
	spec->samples = frames;
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   405
	SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, params, 2, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   406
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   407
	/* "set" the hardware with the desired parameters */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   408
	status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, params);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   409
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   410
		SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   411
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   415
	/* Calculate the final parameters for this audio specification */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   416
	SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   418
	/* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   419
	mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   420
	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   421
	if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   422
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   423
		return(-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
	}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   425
	memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
	/* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
	parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
   430
	/* Switch to blocking mode for playback */
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   431
	SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0);
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
   432
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
	/* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
	return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
}