src/audio/alsa/SDL_alsa_audio.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 07:40:12 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 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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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
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#include <sys/types.h>
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#include <signal.h>             /* For kill() */
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#include <errno.h>
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#include <string.h>
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audiomem.h"
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#include "../SDL_audio_c.h"
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#include "SDL_alsa_audio.h"
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#ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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#include "SDL_loadso.h"
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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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static int (*ALSA_snd_pcm_open)
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  (snd_pcm_t **, const char *, snd_pcm_stream_t, int);
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static int (*ALSA_snd_pcm_close) (snd_pcm_t * pcm);
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static snd_pcm_sframes_t(*ALSA_snd_pcm_writei)
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  (snd_pcm_t *, const void *, snd_pcm_uframes_t);
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static int (*ALSA_snd_pcm_recover) (snd_pcm_t *, int, int);
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static int (*ALSA_snd_pcm_prepare) (snd_pcm_t *);
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static int (*ALSA_snd_pcm_drain) (snd_pcm_t *);
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static const char *(*ALSA_snd_strerror) (int);
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static size_t(*ALSA_snd_pcm_hw_params_sizeof) (void);
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static size_t(*ALSA_snd_pcm_sw_params_sizeof) (void);
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static void (*ALSA_snd_pcm_hw_params_copy)
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  (snd_pcm_hw_params_t *, const snd_pcm_hw_params_t *);
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static int (*ALSA_snd_pcm_hw_params_any) (snd_pcm_t *, snd_pcm_hw_params_t *);
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static int (*ALSA_snd_pcm_hw_params_set_access)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_access_t);
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static int (*ALSA_snd_pcm_hw_params_set_format)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
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static int (*ALSA_snd_pcm_hw_params_set_channels)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int);
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static int (*ALSA_snd_pcm_hw_params_get_channels)
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  (const snd_pcm_hw_params_t *, unsigned int *);
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static int (*ALSA_snd_pcm_hw_params_set_rate_near)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
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static int (*ALSA_snd_pcm_hw_params_set_period_size_near)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
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static int (*ALSA_snd_pcm_hw_params_get_period_size)
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  (const snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
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static int (*ALSA_snd_pcm_hw_params_set_periods_near)
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  (snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
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static int (*ALSA_snd_pcm_hw_params_get_periods)
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  (const snd_pcm_hw_params_t *, unsigned int *, int *);
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static int (*ALSA_snd_pcm_hw_params_set_buffer_size_near)
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  (snd_pcm_t *pcm, snd_pcm_hw_params_t *, snd_pcm_uframes_t *);
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static int (*ALSA_snd_pcm_hw_params_get_buffer_size)
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  (const snd_pcm_hw_params_t *, snd_pcm_uframes_t *);
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static int (*ALSA_snd_pcm_hw_params) (snd_pcm_t *, snd_pcm_hw_params_t *);
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static int (*ALSA_snd_pcm_sw_params_current) (snd_pcm_t *,
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                                              snd_pcm_sw_params_t *);
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static int (*ALSA_snd_pcm_sw_params_set_start_threshold)
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  (snd_pcm_t *, snd_pcm_sw_params_t *, snd_pcm_uframes_t);
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static int (*ALSA_snd_pcm_sw_params) (snd_pcm_t *, snd_pcm_sw_params_t *);
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static int (*ALSA_snd_pcm_nonblock) (snd_pcm_t *, int);
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static int (*ALSA_snd_pcm_wait)(snd_pcm_t *, int);
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#define snd_pcm_hw_params_sizeof ALSA_snd_pcm_hw_params_sizeof
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#define snd_pcm_sw_params_sizeof ALSA_snd_pcm_sw_params_sizeof
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#ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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static void *alsa_handle = NULL;
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static int
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load_alsa_sym(const char *fn, void **addr)
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{
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    *addr = SDL_LoadFunction(alsa_handle, fn);
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    if (*addr == NULL) {
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        /* Don't call SDL_SetError(): SDL_LoadFunction already did. */
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        return 0;
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    }
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    return 1;
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}
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/* cast funcs to char* first, to please GCC's strict aliasing rules. */
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#define SDL_ALSA_SYM(x) \
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    if (!load_alsa_sym(#x, (void **) (char *) &ALSA_##x)) return -1
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#else
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#define SDL_ALSA_SYM(x) ALSA_##x = x
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#endif
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static int
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load_alsa_syms(void)
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{
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    SDL_ALSA_SYM(snd_pcm_open);
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    SDL_ALSA_SYM(snd_pcm_close);
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    SDL_ALSA_SYM(snd_pcm_writei);
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    SDL_ALSA_SYM(snd_pcm_recover);
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    SDL_ALSA_SYM(snd_pcm_prepare);
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    SDL_ALSA_SYM(snd_pcm_drain);
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    SDL_ALSA_SYM(snd_strerror);
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    SDL_ALSA_SYM(snd_pcm_hw_params_sizeof);
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    SDL_ALSA_SYM(snd_pcm_sw_params_sizeof);
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    SDL_ALSA_SYM(snd_pcm_hw_params_copy);
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    SDL_ALSA_SYM(snd_pcm_hw_params_any);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_access);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_format);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_channels);
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    SDL_ALSA_SYM(snd_pcm_hw_params_get_channels);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_rate_near);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_period_size_near);
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    SDL_ALSA_SYM(snd_pcm_hw_params_get_period_size);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_periods_near);
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    SDL_ALSA_SYM(snd_pcm_hw_params_get_periods);
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    SDL_ALSA_SYM(snd_pcm_hw_params_set_buffer_size_near);
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    SDL_ALSA_SYM(snd_pcm_hw_params_get_buffer_size);
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    SDL_ALSA_SYM(snd_pcm_hw_params);
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    SDL_ALSA_SYM(snd_pcm_sw_params_current);
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    SDL_ALSA_SYM(snd_pcm_sw_params_set_start_threshold);
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    SDL_ALSA_SYM(snd_pcm_sw_params);
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    SDL_ALSA_SYM(snd_pcm_nonblock);
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    SDL_ALSA_SYM(snd_pcm_wait);
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    return 0;
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}
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#undef SDL_ALSA_SYM
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#ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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static void
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UnloadALSALibrary(void)
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{
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    if (alsa_handle != NULL) {
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		SDL_UnloadObject(alsa_handle);
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        alsa_handle = NULL;
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    }
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}
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static int
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LoadALSALibrary(void)
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{
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    int retval = 0;
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    if (alsa_handle == NULL) {
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        alsa_handle = SDL_LoadObject(alsa_library);
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        if (alsa_handle == NULL) {
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            retval = -1;
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            /* Don't call SDL_SetError(): SDL_LoadObject already did. */
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        } else {
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            retval = load_alsa_syms();
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            if (retval < 0) {
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                UnloadALSALibrary();
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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
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UnloadALSALibrary(void)
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{
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}
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static int
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LoadALSALibrary(void)
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{
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    load_alsa_syms();
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    return 0;
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}
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#endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
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static const char *
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get_audio_device(int channels)
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{
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    const char *device;
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    device = SDL_getenv("AUDIODEV");    /* Is there a standard variable name? */
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    if (device == NULL) {
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        switch (channels) {
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        case 6:
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            device = "plug:surround51";
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            break;
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        case 4:
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            device = "plug:surround40";
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            break;
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        default:
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            device = "default";
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            break;
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        }
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    }
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    return device;
0
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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
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ALSA_WaitDevice(_THIS)
0
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{
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    /* We're in blocking mode, so there's nothing to do here */
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}
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/* !!! FIXME: is there a channel swizzler in alsalib instead? */
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/*
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 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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 *  and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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 */
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#define SWIZ6(T) \
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    T *ptr = (T *) this->hidden->mixbuf; \
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    const Uint32 count = (this->spec.samples / 6); \
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    Uint32 i; \
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    for (i = 0; i < count; i++, ptr += 6) { \
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        T tmp; \
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        tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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        tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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    }
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static __inline__ void
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swizzle_alsa_channels_6_64bit(_THIS)
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{
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    SWIZ6(Uint64);
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}
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static __inline__ void
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swizzle_alsa_channels_6_32bit(_THIS)
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{
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    SWIZ6(Uint32);
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}
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static __inline__ void
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swizzle_alsa_channels_6_16bit(_THIS)
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{
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    SWIZ6(Uint16);
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}
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static __inline__ void
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swizzle_alsa_channels_6_8bit(_THIS)
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{
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    SWIZ6(Uint8);
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}
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#undef SWIZ6
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/*
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 * Called right before feeding this->hidden->mixbuf to the hardware. Swizzle
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 *  channels from Windows/Mac order to the format alsalib will want.
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 */
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static __inline__ void
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swizzle_alsa_channels(_THIS)
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{
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    if (this->spec.channels == 6) {
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        const Uint16 fmtsize = (this->spec.format & 0xFF);      /* bits/channel. */
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        if (fmtsize == 16)
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            swizzle_alsa_channels_6_16bit(this);
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        else if (fmtsize == 8)
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            swizzle_alsa_channels_6_8bit(this);
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        else if (fmtsize == 32)
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            swizzle_alsa_channels_6_32bit(this);
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        else if (fmtsize == 64)
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            swizzle_alsa_channels_6_64bit(this);
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    }
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    /* !!! FIXME: update this for 7.1 if needed, later. */
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}
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static void
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ALSA_PlayDevice(_THIS)
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{
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    int status;
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    const Uint8 *sample_buf = (const Uint8 *) this->hidden->mixbuf;
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    const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) *
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                                this->spec.channels;
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    snd_pcm_uframes_t frames_left = ((snd_pcm_uframes_t) this->spec.samples);
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    swizzle_alsa_channels(this);
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    while ( frames_left > 0 && this->enabled ) {
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        /* !!! FIXME: This works, but needs more testing before going live */
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        /*ALSA_snd_pcm_wait(this->hidden->pcm_handle, -1);*/
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        status = ALSA_snd_pcm_writei(this->hidden->pcm_handle,
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                                     sample_buf, frames_left);
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        if (status < 0) {
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            if (status == -EAGAIN) {
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                /* Apparently snd_pcm_recover() doesn't handle this case -
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                   does it assume snd_pcm_wait() above? */
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                SDL_Delay(1);
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                continue;
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            }
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            status = ALSA_snd_pcm_recover(this->hidden->pcm_handle, status, 0);
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            if (status < 0) {
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                /* Hmm, not much we can do - abort */
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                fprintf(stderr, "ALSA write failed (unrecoverable): %s\n",
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                        ALSA_snd_strerror(status));
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                this->enabled = 0;
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                return;
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            }
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            continue;
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        }
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        sample_buf += status * frame_size;
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        frames_left -= status;
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    }
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}
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static Uint8 *
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ALSA_GetDeviceBuf(_THIS)
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{
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    return (this->hidden->mixbuf);
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diff changeset
   338
}
74212992fb08 Initial revision
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diff changeset
   339
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1878
diff changeset
   340
static void
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 2043
diff changeset
   341
ALSA_CloseDevice(_THIS)
0
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diff changeset
   342
{
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 2043
diff changeset
   343
    if (this->hidden != NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 2043
diff changeset
   344
        if (this->hidden->mixbuf != NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 2043
diff changeset
   345
            SDL_FreeAudioMem(this->hidden->mixbuf);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   346
            this->hidden->mixbuf = NULL;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 2043
diff changeset
   347
        }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   348
        if (this->hidden->pcm_handle) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   349
            ALSA_snd_pcm_drain(this->hidden->pcm_handle);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   350
            ALSA_snd_pcm_close(this->hidden->pcm_handle);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   351
            this->hidden->pcm_handle = NULL;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   352
        }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   353
        SDL_free(this->hidden);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   354
        this->hidden = NULL;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1878
diff changeset
   355
    }
0
74212992fb08 Initial revision
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diff changeset
   356
}
74212992fb08 Initial revision
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parents:
diff changeset
   357
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1878
diff changeset
   358
static int
3627
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   359
ALSA_finalize_hardware(_THIS, snd_pcm_hw_params_t *hwparams, int override)
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   360
{
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   361
    int status;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   362
    snd_pcm_uframes_t bufsize;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   363
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   364
    /* "set" the hardware with the desired parameters */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   365
    status = ALSA_snd_pcm_hw_params(this->hidden->pcm_handle, hwparams);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   366
    if ( status < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   367
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   368
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   369
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   370
    /* Get samples for the actual buffer size */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   371
    status = ALSA_snd_pcm_hw_params_get_buffer_size(hwparams, &bufsize);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   372
    if ( status < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   373
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   374
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   375
    if ( !override && bufsize != this->spec.samples * 2 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   376
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   377
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   378
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   379
    /* !!! FIXME: Is this safe to do? */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   380
    this->spec.samples = bufsize / 2;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   381
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   382
    /* This is useful for debugging */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   383
    if ( SDL_getenv("SDL_AUDIO_ALSA_DEBUG") ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   384
        snd_pcm_uframes_t persize = 0;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   385
        unsigned int periods = 0;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   386
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   387
        ALSA_snd_pcm_hw_params_get_period_size(hwparams, &persize, NULL);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   388
        ALSA_snd_pcm_hw_params_get_periods(hwparams, &periods, NULL);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   389
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   390
        fprintf(stderr,
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   391
            "ALSA: period size = %ld, periods = %u, buffer size = %lu\n",
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   392
            persize, periods, bufsize);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   393
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   394
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   395
    return(0);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   396
}
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   397
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   398
static int
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   399
ALSA_set_period_size(_THIS, snd_pcm_hw_params_t *params, int override)
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   400
{
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   401
    const char *env;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   402
    int status;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   403
    snd_pcm_hw_params_t *hwparams;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   404
    snd_pcm_uframes_t frames;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   405
    unsigned int periods;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   406
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   407
    /* Copy the hardware parameters for this setup */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   408
    snd_pcm_hw_params_alloca(&hwparams);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   409
    ALSA_snd_pcm_hw_params_copy(hwparams, params);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   410
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   411
    if ( !override ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   412
        env = SDL_getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE");
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   413
        if ( env ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   414
            override = SDL_atoi(env);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   415
            if ( override == 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   416
                return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   417
            }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   418
        }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   419
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   420
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   421
    frames = this->spec.samples;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   422
    status = ALSA_snd_pcm_hw_params_set_period_size_near(
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   423
                this->hidden->pcm_handle, hwparams, &frames, NULL);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   424
    if ( status < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   425
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   426
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   427
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   428
    periods = 2;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   429
    status = ALSA_snd_pcm_hw_params_set_periods_near(
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   430
                this->hidden->pcm_handle, hwparams, &periods, NULL);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   431
    if ( status < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   432
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   433
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   434
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   435
    return ALSA_finalize_hardware(this, hwparams, override);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   436
}
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   437
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   438
static int
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   439
ALSA_set_buffer_size(_THIS, snd_pcm_hw_params_t *params, int override)
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   440
{
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   441
    const char *env;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   442
    int status;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   443
    snd_pcm_hw_params_t *hwparams;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   444
    snd_pcm_uframes_t frames;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   445
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   446
    /* Copy the hardware parameters for this setup */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   447
    snd_pcm_hw_params_alloca(&hwparams);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   448
    ALSA_snd_pcm_hw_params_copy(hwparams, params);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   449
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   450
    if ( !override ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   451
        env = SDL_getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE");
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   452
        if ( env ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   453
            override = SDL_atoi(env);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   454
            if ( override == 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   455
                return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   456
            }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   457
        }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   458
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   459
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   460
    frames = this->spec.samples * 2;
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   461
    status = ALSA_snd_pcm_hw_params_set_buffer_size_near(
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   462
                    this->hidden->pcm_handle, hwparams, &frames);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   463
    if ( status < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   464
        return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   465
    }
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   466
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   467
    return ALSA_finalize_hardware(this, hwparams, override);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   468
}
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   469
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   470
static int
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   471
ALSA_OpenDevice(_THIS, const char *devname, int iscapture)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   472
{
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   473
    int status = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   474
    snd_pcm_t *pcm_handle = NULL;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   475
    snd_pcm_hw_params_t *hwparams = NULL;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   476
    snd_pcm_sw_params_t *swparams = NULL;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   477
    snd_pcm_format_t format = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   478
    SDL_AudioFormat test_format = 0;
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   479
    unsigned int rate = 0;
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   480
    unsigned int channels = 0;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   481
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   482
    /* Initialize all variables that we clean on shutdown */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   483
    this->hidden = (struct SDL_PrivateAudioData *)
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
   484
        SDL_malloc((sizeof *this->hidden));
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   485
    if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   486
        SDL_OutOfMemory();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   487
        return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   488
    }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   489
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   490
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   491
    /* Open the audio device */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   492
    /* Name of device should depend on # channels in spec */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   493
    status = ALSA_snd_pcm_open(&pcm_handle,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   494
                               get_audio_device(this->spec.channels),
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   495
                               SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
   496
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   497
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   498
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   499
        SDL_SetError("ALSA: Couldn't open audio device: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   500
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   501
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   502
    }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   503
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   504
    this->hidden->pcm_handle = pcm_handle;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   505
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   506
    /* Figure out what the hardware is capable of */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   507
    snd_pcm_hw_params_alloca(&hwparams);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   508
    status = ALSA_snd_pcm_hw_params_any(pcm_handle, hwparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   509
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   510
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   511
        SDL_SetError("ALSA: Couldn't get hardware config: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   512
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   513
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   514
    }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   515
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   516
    /* SDL only uses interleaved sample output */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   517
    status = ALSA_snd_pcm_hw_params_set_access(pcm_handle, hwparams,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   518
                                               SND_PCM_ACCESS_RW_INTERLEAVED);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   519
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   520
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   521
        SDL_SetError("ALSA: Couldn't set interleaved access: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   522
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   523
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   524
    }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   525
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   526
    /* Try for a closest match on audio format */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   527
    status = -1;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   528
    for (test_format = SDL_FirstAudioFormat(this->spec.format);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   529
         test_format && (status < 0);) {
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
   530
        status = 0;             /* if we can't support a format, it'll become -1. */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   531
        switch (test_format) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   532
        case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   533
            format = SND_PCM_FORMAT_U8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   534
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   535
        case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   536
            format = SND_PCM_FORMAT_S8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   537
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   538
        case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   539
            format = SND_PCM_FORMAT_S16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   540
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   541
        case AUDIO_S16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   542
            format = SND_PCM_FORMAT_S16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   543
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   544
        case AUDIO_U16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   545
            format = SND_PCM_FORMAT_U16_LE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   546
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   547
        case AUDIO_U16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   548
            format = SND_PCM_FORMAT_U16_BE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   549
            break;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   550
        case AUDIO_S32LSB:
2010
39897da56f63 Whoops, wrong tokens for int32 support in ALSA driver (specified unsigned
Ryan C. Gordon <icculus@icculus.org>
parents: 2009
diff changeset
   551
            format = SND_PCM_FORMAT_S32_LE;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   552
            break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   553
        case AUDIO_S32MSB:
2010
39897da56f63 Whoops, wrong tokens for int32 support in ALSA driver (specified unsigned
Ryan C. Gordon <icculus@icculus.org>
parents: 2009
diff changeset
   554
            format = SND_PCM_FORMAT_S32_BE;
1995
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   555
            break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   556
        case AUDIO_F32LSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   557
            format = SND_PCM_FORMAT_FLOAT_LE;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   558
            break;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   559
        case AUDIO_F32MSB:
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   560
            format = SND_PCM_FORMAT_FLOAT_BE;
0ca6ba107642 ALSA backend can handle int32 and float32 data directly.
Ryan C. Gordon <icculus@icculus.org>
parents: 1982
diff changeset
   561
            break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   562
        default:
2009
f2058fb367e4 ALSA was testing if (format) was set to zero as an error condition, but
Ryan C. Gordon <icculus@icculus.org>
parents: 1995
diff changeset
   563
            status = -1;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   564
            break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   565
        }
2009
f2058fb367e4 ALSA was testing if (format) was set to zero as an error condition, but
Ryan C. Gordon <icculus@icculus.org>
parents: 1995
diff changeset
   566
        if (status >= 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   567
            status = ALSA_snd_pcm_hw_params_set_format(pcm_handle,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   568
                                                       hwparams, format);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   569
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   570
        if (status < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   571
            test_format = SDL_NextAudioFormat();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   572
        }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   573
    }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   574
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   575
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   576
        SDL_SetError("ALSA: Couldn't find any hardware audio formats");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   577
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   578
    }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   579
    this->spec.format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   580
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   581
    /* Set the number of channels */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   582
    status = ALSA_snd_pcm_hw_params_set_channels(pcm_handle, hwparams,
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   583
                                                 this->spec.channels);
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   584
    channels = this->spec.channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   585
    if (status < 0) {
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   586
        status = ALSA_snd_pcm_hw_params_get_channels(hwparams, &channels);
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   587
        if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   588
            ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   589
            SDL_SetError("ALSA: Couldn't set audio channels");
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   590
            return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   591
        }
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   592
        this->spec.channels = channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   593
    }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   594
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   595
    /* Set the audio rate */
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   596
    rate = this->spec.freq;
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   597
    status = ALSA_snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams,
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   598
                                                  &rate, NULL);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   599
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   600
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   601
        SDL_SetError("ALSA: Couldn't set audio frequency: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   602
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   603
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   604
    }
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   605
    this->spec.freq = rate;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   606
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   607
    /* Set the buffer size, in samples */
3627
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   608
    if ( ALSA_set_period_size(this, hwparams, 0) < 0 &&
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   609
         ALSA_set_buffer_size(this, hwparams, 0) < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   610
        /* Failed to set desired buffer size, do the best you can... */
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   611
        if ( ALSA_set_period_size(this, hwparams, 1) < 0 ) {
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   612
            ALSA_CloseDevice(this);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   613
            SDL_SetError("Couldn't set hardware audio parameters: %s", ALSA_snd_strerror(status));
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   614
            return(-1);
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   615
        }
3362
4e83cdb58134 Merged r4990:4991 from branches/SDL-1.2: ALSA 1.0 API and dlvsym() removal.
Ryan C. Gordon <icculus@icculus.org>
parents: 3068
diff changeset
   616
    }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   617
    /* Set the software parameters */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   618
    snd_pcm_sw_params_alloca(&swparams);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   619
    status = ALSA_snd_pcm_sw_params_current(pcm_handle, swparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   620
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   621
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   622
        SDL_SetError("ALSA: Couldn't get software config: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   623
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   624
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   625
    }
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
   626
    status =
3627
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   627
        ALSA_snd_pcm_sw_params_set_start_threshold(pcm_handle, swparams, 1);
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   628
    if (status < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   629
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   630
        SDL_SetError("ALSA: Couldn't set start threshold: %s",
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   631
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   632
        return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   633
    }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   634
    status = ALSA_snd_pcm_sw_params(pcm_handle, swparams);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   635
    if (status < 0) {
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   636
        ALSA_CloseDevice(this);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   637
        SDL_SetError("Couldn't set software audio parameters: %s",
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   638
                     ALSA_snd_strerror(status));
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   639
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   640
    }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   641
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   642
    /* Calculate the final parameters for this audio specification */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   643
    SDL_CalculateAudioSpec(&this->spec);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   644
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   645
    /* Allocate mixing buffer */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   646
    this->hidden->mixlen = this->spec.size;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   647
    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   648
    if (this->hidden->mixbuf == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   649
        ALSA_CloseDevice(this);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   650
        SDL_OutOfMemory();
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   651
        return 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   652
    }
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   653
    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   654
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   655
    /* Switch to blocking mode for playback */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   656
    ALSA_snd_pcm_nonblock(pcm_handle, 0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   657
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   658
    /* We're ready to rock and roll. :-) */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   659
    return 1;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   660
}
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   661
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   662
static void
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   663
ALSA_Deinitialize(void)
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   664
{
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   665
    UnloadALSALibrary();
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   666
}
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   667
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   668
static int
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
   669
ALSA_Init(SDL_AudioDriverImpl * impl)
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   670
{
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   671
    if (LoadALSALibrary() < 0) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   672
        return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   673
    }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   674
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   675
    /* Set the function pointers */
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   676
    impl->OpenDevice = ALSA_OpenDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   677
    impl->WaitDevice = ALSA_WaitDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   678
    impl->GetDeviceBuf = ALSA_GetDeviceBuf;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   679
    impl->PlayDevice = ALSA_PlayDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   680
    impl->CloseDevice = ALSA_CloseDevice;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   681
    impl->Deinitialize = ALSA_Deinitialize;
2060
866052b01ee5 indent is evil
Sam Lantinga <slouken@libsdl.org>
parents: 2049
diff changeset
   682
    impl->OnlyHasDefaultOutputDevice = 1;       /* !!! FIXME: Add device enum! */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   683
2942
Sam Lantinga <slouken@libsdl.org>
parents: 2938
diff changeset
   684
    return 1;                   /* !!! FIXME: return 2 once device enum is implemented. */
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   685
}
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   686
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   687
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   688
AudioBootStrap ALSA_bootstrap = {
3627
631173ffd68f Merged r4991:5154 from branches/SDL-1.2/src/audio/alsa: many 1.2.14 ALSA fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3362
diff changeset
   689
    DRIVER_NAME, "ALSA PCM audio", ALSA_Init, 0
2049
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   690
};
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
Ryan C. Gordon <icculus@icculus.org>
parents: 2043
diff changeset
   691
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1878
diff changeset
   692
/* vi: set ts=4 sw=4 expandtab: */