src/audio/alsa/SDL_alsa_audio.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 19 Oct 2009 05:24:48 +0000
branchSDL-1.2
changeset 4362 e48a66bed093
parent 4361 991e4bcfc7a8
child 4363 028d26915548
permissions -rw-r--r--
ALSA write failed (unrecoverable): Resource temporarily unavailable
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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 "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_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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/* 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 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 alsa_loaded = 0;
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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_recover))(snd_pcm_t *pcm, int err, int silent);
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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 size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void);
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static void (*SDL_NAME(snd_pcm_hw_params_copy))(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src);
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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, unsigned int *val);
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static 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 int (*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 int (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
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static 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_get_periods))(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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static int (*SDL_NAME(snd_pcm_hw_params_set_buffer_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
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static int (*SDL_NAME(snd_pcm_hw_params_get_buffer_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
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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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/*
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*/
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static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams);
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static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
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static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_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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#define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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/* cast funcs to char* first, to please GCC's strict aliasing rules. */
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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**)(char*)&SDL_NAME(snd_pcm_open)		},
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	{ "snd_pcm_close",	(void**)(char*)&SDL_NAME(snd_pcm_close)	},
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	{ "snd_pcm_writei",	(void**)(char*)&SDL_NAME(snd_pcm_writei)	},
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	{ "snd_pcm_recover",	(void**)(char*)&SDL_NAME(snd_pcm_recover)	},
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	{ "snd_pcm_prepare",	(void**)(char*)&SDL_NAME(snd_pcm_prepare)	},
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	{ "snd_pcm_drain",	(void**)(char*)&SDL_NAME(snd_pcm_drain)	},
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	{ "snd_strerror",	(void**)(char*)&SDL_NAME(snd_strerror)		},
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	{ "snd_pcm_hw_params_sizeof",		(void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof)		},
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	{ "snd_pcm_sw_params_sizeof",		(void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof)		},
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	{ "snd_pcm_hw_params_copy",		(void**)(char*)&SDL_NAME(snd_pcm_hw_params_copy)		},
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	{ "snd_pcm_hw_params_any",		(void**)(char*)&SDL_NAME(snd_pcm_hw_params_any)		},
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	{ "snd_pcm_hw_params_set_access",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access)		},
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	{ "snd_pcm_hw_params_set_format",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format)		},
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	{ "snd_pcm_hw_params_set_channels",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels)	},
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	{ "snd_pcm_hw_params_get_channels",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels)	},
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	{ "snd_pcm_hw_params_set_rate_near",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near)	},
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	{ "snd_pcm_hw_params_set_period_size_near",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near)	},
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   113
	{ "snd_pcm_hw_params_get_period_size",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size)	},
1161
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   114
	{ "snd_pcm_hw_params_set_periods_near",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near)	},
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   115
	{ "snd_pcm_hw_params_get_periods",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods)	},
4333
55717a755897 Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
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	{ "snd_pcm_hw_params_set_buffer_size_near",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_buffer_size_near) },
4331
a24454ed4ac4 Fixed debug code to print correct values
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   117
	{ "snd_pcm_hw_params_get_buffer_size",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_buffer_size) },
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	{ "snd_pcm_hw_params",	(void**)(char*)&SDL_NAME(snd_pcm_hw_params)	},
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   119
	{ "snd_pcm_sw_params_current",	(void**)(char*)&SDL_NAME(snd_pcm_sw_params_current)	},
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	{ "snd_pcm_sw_params_set_start_threshold",	(void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold)	},
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	{ "snd_pcm_sw_params",	(void**)(char*)&SDL_NAME(snd_pcm_sw_params)	},
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	{ "snd_pcm_nonblock",	(void**)(char*)&SDL_NAME(snd_pcm_nonblock)	},
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};
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   124
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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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		alsa_handle = NULL;
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		alsa_loaded = 0;
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	}
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}
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   132
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static int LoadALSALibrary(void) {
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	int i, retval = -1;
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   135
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	alsa_handle = SDL_LoadObject(alsa_library);
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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_arraysize(alsa_functions); i++) {
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			*alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);
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			if (!*alsa_functions[i].func) {
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				retval = -1;
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   144
				UnloadALSALibrary();
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   145
				break;
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   146
			}
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   147
		}
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   148
	}
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   149
	return retval;
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   150
}
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   151
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   152
#else
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   153
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static void UnloadALSALibrary(void) {
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	return;
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   156
}
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   157
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static int LoadALSALibrary(void) {
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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 *get_audio_device(int channels)
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{
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	const char *device;
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   167
	
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	device = SDL_getenv("AUDIODEV");	/* Is there a standard variable name? */
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   169
	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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   174
		case 4:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion.
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   175
			device = "plug:surround40";
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   176
			break;
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   177
		default:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion.
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   178
			device = "default";
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			break;
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   180
		}
354
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   181
	}
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   182
	return device;
0
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   183
}
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   184
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   185
/* Audio driver bootstrap functions */
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   186
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   187
static int Audio_Available(void)
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   188
{
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   189
	int available;
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   190
	int status;
0
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   191
	snd_pcm_t *handle;
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   192
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   193
	available = 0;
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   194
	if (LoadALSALibrary() < 0) {
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   195
		return available;
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   196
	}
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   197
	status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354
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   198
	if ( status >= 0 ) {
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   199
		available = 1;
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   200
        	SDL_NAME(snd_pcm_close)(handle);
0
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   201
	}
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   202
	UnloadALSALibrary();
0
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   203
	return(available);
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   204
}
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   205
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   206
static void Audio_DeleteDevice(SDL_AudioDevice *device)
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   207
{
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   208
	SDL_free(device->hidden);
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   209
	SDL_free(device);
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   210
	UnloadALSALibrary();
0
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   211
}
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   212
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   213
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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   214
{
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   215
	SDL_AudioDevice *this;
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   216
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   217
	/* Initialize all variables that we clean on shutdown */
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   218
	LoadALSALibrary();
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   219
	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0
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   220
	if ( this ) {
1336
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   221
		SDL_memset(this, 0, (sizeof *this));
0
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   222
		this->hidden = (struct SDL_PrivateAudioData *)
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diff changeset
   223
				SDL_malloc((sizeof *this->hidden));
0
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diff changeset
   224
	}
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   225
	if ( (this == NULL) || (this->hidden == NULL) ) {
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diff changeset
   226
		SDL_OutOfMemory();
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   227
		if ( this ) {
1336
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   228
			SDL_free(this);
0
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diff changeset
   229
		}
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   230
		return(0);
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diff changeset
   231
	}
1336
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   232
	SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
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   233
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   234
	/* Set the function pointers */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   235
	this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   236
	this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   237
	this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   238
	this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
   239
	this->CloseAudio = ALSA_CloseAudio;
0
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   240
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   241
	this->free = Audio_DeleteDevice;
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   242
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   243
	return this;
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diff changeset
   244
}
74212992fb08 Initial revision
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AudioBootStrap ALSA_bootstrap = {
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	DRIVER_NAME, "ALSA PCM audio",
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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)
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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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/*
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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 *) 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 swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); }
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static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); }
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static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); }
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static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); }
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#undef SWIZ6
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/*
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 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
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 *  from Windows/Mac order to the format alsalib will want.
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 */
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static __inline__ void 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 ALSA_PlayAudio(_THIS)
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{
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	int status;
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	snd_pcm_uframes_t frames_left;
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	const Uint8 *sample_buf = (const Uint8 *) mixbuf;
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	const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels;
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	swizzle_alsa_channels(this);
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	frames_left = ((snd_pcm_uframes_t) this->spec.samples);
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	while ( frames_left > 0 && this->enabled ) {
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		status = SDL_NAME(snd_pcm_writei)(pcm_handle, 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. Foo. */
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				SDL_Delay(1);
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				continue;
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			}
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			status = SDL_NAME(snd_pcm_recover)(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", SDL_NAME(snd_strerror)(status));
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				this->enabled = 0;
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				return;
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			}
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a1e54d1ba16f *** empty log message ***
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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 *ALSA_GetAudioBuf(_THIS)
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{
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	return(mixbuf);
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}
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static void ALSA_CloseAudio(_THIS)
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{
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	if ( mixbuf != NULL ) {
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		SDL_FreeAudioMem(mixbuf);
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		mixbuf = NULL;
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	}
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	if ( pcm_handle ) {
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		SDL_NAME(snd_pcm_drain)(pcm_handle);
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		SDL_NAME(snd_pcm_close)(pcm_handle);
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		pcm_handle = NULL;
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	}
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}
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static int ALSA_finalize_hardware(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *hwparams, int override)
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{
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	int status;
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	snd_pcm_uframes_t bufsize;
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	/* "set" the hardware with the desired parameters */
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	status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams);
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	if ( status < 0 ) {
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		return(-1);
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	}
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	/* Get samples for the actual buffer size */
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	status = SDL_NAME(snd_pcm_hw_params_get_buffer_size)(hwparams, &bufsize);
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	if ( status < 0 ) {
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diff changeset
   368
		return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   369
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   370
	if ( !override && bufsize != spec->samples * 2 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   371
		return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   372
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   373
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   374
	/* FIXME: Is this safe to do? */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   375
	spec->samples = bufsize / 2;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   376
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   377
	/* This is useful for debugging */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   378
	if ( getenv("SDL_AUDIO_ALSA_DEBUG") ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   379
		snd_pcm_sframes_t persize = 0;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   380
		unsigned int periods = 0;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   381
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   382
		SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams, &persize, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   383
		SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams, &periods, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   384
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   385
		fprintf(stderr, "ALSA: period size = %ld, periods = %u, buffer size = %lu\n", persize, periods, bufsize);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   386
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   387
	return(0);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   388
}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   389
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   390
static int ALSA_set_period_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override)
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   391
{
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   392
	const char *env;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   393
	int status;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   394
	snd_pcm_hw_params_t *hwparams;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   395
	snd_pcm_uframes_t frames;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   396
	unsigned int periods;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   397
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   398
	/* Copy the hardware parameters for this setup */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   399
	snd_pcm_hw_params_alloca(&hwparams);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   400
	SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   401
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   402
	if ( !override ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   403
		env = getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE");
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   404
		if ( env ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   405
			override = SDL_atoi(env);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   406
			if ( override == 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   407
				return(-1);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   408
			}
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   409
		}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   410
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   411
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   412
	frames = spec->samples;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   413
	status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   414
	if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   415
		return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   416
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   417
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   418
	periods = 2;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   419
	status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   420
	if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   421
		return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   422
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   423
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   424
	return ALSA_finalize_hardware(this, spec, hwparams, override);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   425
}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   426
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   427
static int ALSA_set_buffer_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override)
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   428
{
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   429
	const char *env;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   430
	int status;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   431
	snd_pcm_hw_params_t *hwparams;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   432
	snd_pcm_uframes_t frames;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   433
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   434
	/* Copy the hardware parameters for this setup */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   435
	snd_pcm_hw_params_alloca(&hwparams);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   436
	SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   437
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   438
	if ( !override ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   439
		env = getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE");
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   440
		if ( env ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   441
			override = SDL_atoi(env);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   442
			if ( override == 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   443
				return(-1);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   444
			}
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   445
		}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   446
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   447
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   448
	frames = spec->samples * 2;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   449
	status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   450
	if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   451
		return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   452
	}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   453
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   454
	return ALSA_finalize_hardware(this, spec, hwparams, override);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   455
}
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   456
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   457
static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   458
{
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   459
	int                  status;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   460
	snd_pcm_hw_params_t *hwparams;
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   461
	snd_pcm_sw_params_t *swparams;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   462
	snd_pcm_format_t     format;
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   463
	unsigned int         rate;
4333
55717a755897 Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
Sam Lantinga <slouken@libsdl.org>
parents: 4332
diff changeset
   464
	unsigned int 	     channels;
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   465
	snd_pcm_uframes_t    bufsize;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   466
	Uint16               test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   467
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   468
	/* Open the audio device */
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
   469
	/* Name of device should depend on # channels in spec */
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
   470
	status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
   471
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   472
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   473
		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
   474
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   475
	}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   476
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   477
	/* Figure out what the hardware is capable of */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   478
	snd_pcm_hw_params_alloca(&hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   479
	status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   480
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   481
		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
   482
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   483
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   484
	}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   485
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   486
	/* SDL only uses interleaved sample output */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   487
	status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   488
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   489
		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
   490
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   491
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   492
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   493
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   494
	/* 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
   495
	status = -1;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   496
	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
   497
	      test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   498
		switch ( test_format ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   499
			case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   500
				format = SND_PCM_FORMAT_U8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   501
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   502
			case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   503
				format = SND_PCM_FORMAT_S8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   504
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   505
			case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   506
				format = SND_PCM_FORMAT_S16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   507
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   508
			case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   509
				format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   510
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   511
			case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   512
				format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   513
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   514
			case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   515
				format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   516
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   517
			default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   518
				format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   519
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   520
		}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   521
		if ( format != 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   522
			status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   523
		}
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   524
		if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   525
			test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   526
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   527
	}
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   528
	if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   529
		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
   530
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   531
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   532
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   533
	spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   534
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   535
	/* Set the number of channels */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   536
	status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels);
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   537
	channels = spec->channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   538
	if ( status < 0 ) {
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   539
		status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams, &channels);
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   540
		if ( status < 0 ) {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   541
			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
   542
			ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   543
			return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   544
		}
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   545
		spec->channels = channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   546
	}
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   547
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   548
	/* Set the audio rate */
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   549
	rate = spec->freq;
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   550
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   551
	status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, &rate, NULL);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   552
	if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   553
		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
   554
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   555
		return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   556
	}
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
   557
	spec->freq = rate;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   558
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   559
	/* Set the buffer size, in samples */
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   560
	if ( ALSA_set_period_size(this, spec, hwparams, 0) < 0 &&
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   561
	     ALSA_set_buffer_size(this, spec, hwparams, 0) < 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   562
		/* Failed to set desired buffer size, do the best you can... */
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
   563
		if ( ALSA_set_period_size(this, spec, hwparams, 1) < 0 ) {
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
   564
			SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status));
4347
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
   565
			ALSA_CloseAudio(this);
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
   566
			return(-1);
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
   567
		}
4348
b312352d8c8d Enable the ALSA debug code via environment variable
Sam Lantinga <slouken@libsdl.org>
parents: 4347
diff changeset
   568
	}
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   569
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   570
	/* Set the software parameters */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   571
	snd_pcm_sw_params_alloca(&swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   572
	status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   573
	if ( status < 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   574
		SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   575
		ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   576
		return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   577
	}
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
   578
	status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 1);
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   579
	if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   580
		SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   581
		ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   582
		return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   583
	}
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   584
	status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   585
	if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
   586
		SDL_SetError("Couldn't set software 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
   587
		ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   588
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   589
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   590
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   591
	/* 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
   592
	SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   593
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   594
	/* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   595
	mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   596
	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   597
	if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   598
		ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   599
		return(-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   600
	}
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
   601
	SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   602
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
   603
	/* 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
   604
	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
   605
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   606
	/* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   607
	return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   608
}