sdl-ios-xcode: src/audio/alsa/SDL_alsa

annotate src/audio/alsa/SDL_alsa_audio.c @ 940:bb1588ebe47b

Date: Sat, 10 Jul 2004 21:02:33 +0200 From: "Philippe Plantier (ayin)" Subject: [SDL] Problems allocating large surfaces There are problems when allocating large surfaces using SDL_CreateRGBSurface. When, for example, we try to allocate a surface wider than 16384 pixels, the calculation of the pitch overflows; this leads to a surface that has the w and h flags correctly set, but whose "pixels" buffer is too small. That may lead to heap corruption.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 21 Aug 2004 05:29:45 +0000
parents	c7c04f811994
children	41a59de7f2ed

rev	line source
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1 /*
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	2 SDL - Simple DirectMedia Layer
769 b8d311d90021 Updated copyright information for 2004 (Happy New Year!) Sam Lantinga <slouken@libsdl.org> parents: 765 diff changeset	3 Copyright (C) 1997-2004 Sam Lantinga
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	4
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	5 This library is free software; you can redistribute it and/or
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	6 modify it under the terms of the GNU Library General Public
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	7 License as published by the Free Software Foundation; either
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	8 version 2 of the License, or (at your option) any later version.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	9
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	13 Library General Public License for more details.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	14
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	15 You should have received a copy of the GNU Library General Public
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	16 License along with this library; if not, write to the Free
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	18
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	19 Sam Lantinga
252 e8157fcb3114 Updated the source with the correct e-mail address Sam Lantinga <slouken@libsdl.org> parents: 0 diff changeset	20 slouken@libsdl.org
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	21 */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	22
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	23
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	24
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	25 /* Allow access to a raw mixing buffer */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	26
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	27 #include <stdlib.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	28 #include <stdio.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	29 #include <string.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	30 #include <errno.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	31 #include <unistd.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	32 #include <fcntl.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	33 #include <signal.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	34 #include <sys/types.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	35 #include <sys/time.h>
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	36
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	37 #include "SDL_audio.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	38 #include "SDL_error.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	39 #include "SDL_audiomem.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	40 #include "SDL_audio_c.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	41 #include "SDL_timer.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	42 #include "SDL_alsa_audio.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	43
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	44 #ifdef ALSA_DYNAMIC
939 c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	45 #ifdef USE_DLVSYM
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	46 #define __USE_GNU
939 c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	47 #endif
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	48 #include <dlfcn.h>
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	49 #include "SDL_name.h"
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	50 #include "SDL_loadso.h"
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	51 #else
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	52 #define SDL_NAME(X) X
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	53 #endif
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	54
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	55
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	56 /* The tag name used by ALSA audio */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	57 #define DRIVER_NAME "alsa"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	58
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	59 /* The default ALSA audio driver */
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	60 #define DEFAULT_DEVICE "default"
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	61
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	62 /* Audio driver functions */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	63 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	64 static void ALSA_WaitAudio(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	65 static void ALSA_PlayAudio(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	66 static Uint8 *ALSA_GetAudioBuf(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	67 static void ALSA_CloseAudio(_THIS);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	68
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	69 #ifdef ALSA_DYNAMIC
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	70
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	71 static const char *alsa_library = ALSA_DYNAMIC;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	72 static void *alsa_handle = NULL;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	73 static int alsa_loaded = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	74
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	75 static int (SDL_snd_pcm_open)(snd_pcm_t pcm, const char name, snd_pcm_stream_t stream, int mode);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	76 static int (SDL_NAME(snd_pcm_open))(snd_pcm_t pcm, const char name, snd_pcm_stream_t stream, int mode);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	77 static int (SDL_NAME(snd_pcm_close))(snd_pcm_t pcm);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	78 static snd_pcm_sframes_t (SDL_NAME(snd_pcm_writei))(snd_pcm_t pcm, const void *buffer, snd_pcm_uframes_t size);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	79 static int (SDL_NAME(snd_pcm_resume))(snd_pcm_t pcm);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	80 static int (SDL_NAME(snd_pcm_prepare))(snd_pcm_t pcm);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	81 static int (SDL_NAME(snd_pcm_drain))(snd_pcm_t pcm);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	82 static const char (SDL_NAME(snd_strerror))(int errnum);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	83 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	84 static int (SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t pcm, snd_pcm_hw_params_t *params);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	85 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);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	86 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);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	87 static int (SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t pcm, snd_pcm_hw_params_t *params, unsigned int val);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	88 static int (SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t params);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	89 static unsigned int (SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t pcm, snd_pcm_hw_params_t params, unsigned int val, int dir);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	90 static snd_pcm_uframes_t (SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t pcm, snd_pcm_hw_params_t params, snd_pcm_uframes_t val, int dir);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	91 static unsigned int (SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t pcm, snd_pcm_hw_params_t params, unsigned int val, int dir);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	92 static int (SDL_NAME(snd_pcm_hw_params))(snd_pcm_t pcm, snd_pcm_hw_params_t *params);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	93 static int (SDL_NAME(snd_pcm_nonblock))(snd_pcm_t pcm, int nonblock);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	94 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	95
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	96 static struct {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	97 const char *name;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	98 void **func;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	99 } alsa_functions[] = {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	100 { "snd_pcm_open", (void**)&SDL_NAME(snd_pcm_open) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	101 { "snd_pcm_close", (void**)&SDL_NAME(snd_pcm_close) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	102 { "snd_pcm_writei", (void**)&SDL_NAME(snd_pcm_writei) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	103 { "snd_pcm_resume", (void**)&SDL_NAME(snd_pcm_resume) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	104 { "snd_pcm_prepare", (void**)&SDL_NAME(snd_pcm_prepare) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	105 { "snd_pcm_drain", (void**)&SDL_NAME(snd_pcm_drain) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	106 { "snd_strerror", (void**)&SDL_NAME(snd_strerror) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	107 { "snd_pcm_hw_params_sizeof", (void**)&SDL_NAME(snd_pcm_hw_params_sizeof) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	108 { "snd_pcm_hw_params_any", (void**)&SDL_NAME(snd_pcm_hw_params_any) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	109 { "snd_pcm_hw_params_set_access", (void**)&SDL_NAME(snd_pcm_hw_params_set_access) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	110 { "snd_pcm_hw_params_set_format", (void**)&SDL_NAME(snd_pcm_hw_params_set_format) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	111 { "snd_pcm_hw_params_set_channels", (void**)&SDL_NAME(snd_pcm_hw_params_set_channels) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	112 { "snd_pcm_hw_params_get_channels", (void**)&SDL_NAME(snd_pcm_hw_params_get_channels) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	113 { "snd_pcm_hw_params_set_rate_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	114 { "snd_pcm_hw_params_set_period_size_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	115 { "snd_pcm_hw_params_set_periods_near", (void**)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	116 { "snd_pcm_hw_params", (void**)&SDL_NAME(snd_pcm_hw_params) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	117 { "snd_pcm_nonblock", (void**)&SDL_NAME(snd_pcm_nonblock) },
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	118 };
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	119
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	120 static void UnloadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	121 if (alsa_loaded) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	122 /* SDL_UnloadObject(alsa_handle);*/
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	123 dlclose(alsa_handle);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	124 alsa_handle = NULL;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	125 alsa_loaded = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	126 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	127 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	128
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	129 static int LoadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	130 int i, retval = -1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	131
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	132 /* alsa_handle = SDL_LoadObject(alsa_library);*/
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	133 alsa_handle = dlopen(alsa_library,RTLD_NOW);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	134 if (alsa_handle) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	135 alsa_loaded = 1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	136 retval = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	137 for (i = 0; i < SDL_TABLESIZE(alsa_functions); i++) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	138 /* alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);/
939 c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	139 #ifdef USE_DLVSYM
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	140 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
939 c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	141 if (!*alsa_functions[i].func)
c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	142 #endif
c7c04f811994 Date: Tue, 01 Jun 2004 15:27:44 +0300 Sam Lantinga <slouken@libsdl.org> parents: 865 diff changeset	143 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	144 if (!*alsa_functions[i].func) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	145 retval = -1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	146 UnloadALSALibrary();
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	147 break;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	148 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	149 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	150 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	151 return retval;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	152 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	153
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	154 #else
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	155
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	156 static void UnloadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	157 return;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	158 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	159
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	160 static int LoadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	161 return 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	162 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	163
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	164 #endif /* ALSA_DYNAMIC */
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	165
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	166 static const char *get_audio_device()
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	167 {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	168 const char *device;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	169
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	170 device = getenv("AUDIODEV"); /* Is there a standard variable name? */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	171 if ( device == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	172 device = DEFAULT_DEVICE;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	173 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	174 return device;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	175 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	176
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	177 /* Audio driver bootstrap functions */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	178
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	179 static int Audio_Available(void)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	180 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	181 int available;
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	182 int status;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	183 snd_pcm_t *handle;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	184
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185 available = 0;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	186 if (LoadALSALibrary() < 0) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	187 return available;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	188 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	189 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	190 if ( status >= 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	191 available = 1;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	192 SDL_NAME(snd_pcm_close)(handle);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	193 }
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	194 UnloadALSALibrary();
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	195 return(available);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	196 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	197
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	198 static void Audio_DeleteDevice(SDL_AudioDevice *device)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	199 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	200 free(device->hidden);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	201 free(device);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	202 UnloadALSALibrary();
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	203 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	204
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	205 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	206 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	207 SDL_AudioDevice *this;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	208
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	209 /* Initialize all variables that we clean on shutdown */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	210 LoadALSALibrary();
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	211 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	212 if ( this ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	213 memset(this, 0, (sizeof *this));
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	214 this->hidden = (struct SDL_PrivateAudioData *)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	215 malloc((sizeof *this->hidden));
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	216 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	217 if ( (this == NULL) \|\| (this->hidden == NULL) ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	218 SDL_OutOfMemory();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	219 if ( this ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	220 free(this);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	221 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	222 return(0);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	223 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	224 memset(this->hidden, 0, (sizeof *this->hidden));
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	225
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	226 /* Set the function pointers */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	227 this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	228 this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	229 this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	230 this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	231 this->CloseAudio = ALSA_CloseAudio;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	232
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	233 this->free = Audio_DeleteDevice;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	234
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	235 return this;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	236 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	237
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	238 AudioBootStrap ALSA_bootstrap = {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	239 DRIVER_NAME, "ALSA 0.9 PCM audio",
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	240 Audio_Available, Audio_CreateDevice
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	241 };
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	242
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	243 /* This function waits until it is possible to write a full sound buffer */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	244 static void ALSA_WaitAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	245 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	246 /* Check to see if the thread-parent process is still alive */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	247 { static int cnt = 0;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	248 /* Note that this only works with thread implementations
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	249 that use a different process id for each thread.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	250 */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	251 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	252 if ( kill(parent, 0) < 0 ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	253 this->enabled = 0;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	254 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	255 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	256 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	257 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	258
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	259 static void ALSA_PlayAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	260 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	261 int status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	262 int sample_len;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	263 signed short *sample_buf;
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	264
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	265 sample_len = this->spec.samples;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	266 sample_buf = (signed short *)mixbuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	267 while ( sample_len > 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	268 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	269 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	270 if ( status == -EAGAIN ) {
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	271 SDL_Delay(1);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	272 continue;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	273 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	274 if ( status == -ESTRPIPE ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	275 do {
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	276 SDL_Delay(1);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	277 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	278 } while ( status == -EAGAIN );
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	279 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	280 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	281 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	282 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	283 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	284 /* Hmm, not much we can do - abort */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	285 this->enabled = 0;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	286 return;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	287 }
356 a1e54d1ba16f * empty log message * Sam Lantinga <slouken@libsdl.org> parents: 354 diff changeset	288 continue;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	289 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	290 sample_buf += status * this->spec.channels;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	291 sample_len -= status;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	292 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	293 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	294
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	295 static Uint8 *ALSA_GetAudioBuf(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	296 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	297 return(mixbuf);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	298 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	299
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	300 static void ALSA_CloseAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	301 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	302 if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	303 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	304 mixbuf = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	305 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	306 if ( pcm_handle ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	307 SDL_NAME(snd_pcm_drain)(pcm_handle);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	308 SDL_NAME(snd_pcm_close)(pcm_handle);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	309 pcm_handle = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	310 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	311 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	312
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	313 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	314 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	315 int status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	316 snd_pcm_hw_params_t *params;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	317 snd_pcm_format_t format;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	318 snd_pcm_uframes_t frames;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	319 Uint16 test_format;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	320
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	321 /* Open the audio device */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	322 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	323 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	324 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	325 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	326 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	327
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	328 /* Figure out what the hardware is capable of */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	329 snd_pcm_hw_params_alloca(&params);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	330 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, params);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	331 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	332 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	333 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	334 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	335 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	336
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	337 /* SDL only uses interleaved sample output */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	338 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	339 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	340 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	341 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	342 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	343 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	344
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	345 /* 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	346 status = -1;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	347 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	348 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	349 switch ( test_format ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	350 case AUDIO_U8:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	351 format = SND_PCM_FORMAT_U8;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	352 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	353 case AUDIO_S8:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	354 format = SND_PCM_FORMAT_S8;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	355 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	356 case AUDIO_S16LSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	357 format = SND_PCM_FORMAT_S16_LE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	358 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	359 case AUDIO_S16MSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	360 format = SND_PCM_FORMAT_S16_BE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	361 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	362 case AUDIO_U16LSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	363 format = SND_PCM_FORMAT_U16_LE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	364 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	365 case AUDIO_U16MSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	366 format = SND_PCM_FORMAT_U16_BE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	367 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	368 default:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	369 format = 0;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	370 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	371 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	372 if ( format != 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	373 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, params, format);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	374 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	375 if ( status < 0 ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	376 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	377 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	378 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	379 if ( status < 0 ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	380 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	381 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	382 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	383 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	384 spec->format = test_format;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	385
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	386 /* Set the number of channels */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	387 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, params, spec->channels);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	388 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	389 status = SDL_NAME(snd_pcm_hw_params_get_channels)(params);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	390 if ( (status <= 0) \|\| (status > 2) ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	391 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	392 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	393 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	394 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	395 spec->channels = status;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	396 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	397
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	398 /* Set the audio rate */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	399 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, params, spec->freq, NULL);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	400 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	401 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	402 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	403 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	404 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	405 spec->freq = status;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	406
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	407 /* Set the buffer size, in samples */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	408 frames = spec->samples;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	409 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, params, frames, NULL);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	410 spec->samples = frames;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	411 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, params, 2, NULL);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	412
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	413 /* "set" the hardware with the desired parameters */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	414 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, params);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	415 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	416 SDL_SetError("Couldn't set audio parameters: %s", SDL_NAME(snd_strerror)(status));
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	417 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	418 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	419 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	420
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	421 /* 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	422 SDL_CalculateAudioSpec(spec);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	423
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	424 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	425 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	426 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	427 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	428 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	429 return(-1);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	430 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	431 memset(mixbuf, spec->silence, spec->size);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	432
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	433 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	434 parent = getpid();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	435
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	436 /* 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	437 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	438
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	439 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	440 return(0);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	441 }

Mercurial > sdl-ios-xcode

annotate src/audio/alsa/SDL_alsa_audio.c @ 940:bb1588ebe47b