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

annotate src/audio/alsa/SDL_alsa_audio.c @ 4347:38f22ed3a433 SDL-1.2

Option to fix bug #851 For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse. You can use an environment variable to pick which one you want.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 17 Oct 2009 06:55:17 +0000
parents	819270e2f893
children	b312352d8c8d

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
4159 a1b03ba2fcd0 Updated copyright date Sam Lantinga <slouken@libsdl.org> parents: 1878 diff changeset	3 Copyright (C) 1997-2009 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 */
1402 d910939febfa Use consistent identifiers for the various platforms we support. Sam Lantinga <slouken@libsdl.org> parents: 1379 diff changeset	22 #include "SDL_config.h"
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	23
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	24 /* Allow access to a raw mixing buffer */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	25
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	26 #include <sys/types.h>
1338 604d73db6802 Removed uses of stdlib.h and string.h Sam Lantinga <slouken@libsdl.org> parents: 1336 diff changeset	27 #include <signal.h> /* For kill() */
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	28
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	29 #include "SDL_timer.h"
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	30 #include "SDL_audio.h"
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	31 #include "../SDL_audiomem.h"
19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	32 #include "../SDL_audio_c.h"
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	33 #include "SDL_alsa_audio.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	34
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	35 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	36 #include "SDL_name.h"
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	37 #include "SDL_loadso.h"
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	38 #else
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	39 #define SDL_NAME(X) X
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	40 #endif
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	41
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	42
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	43 /* The tag name used by ALSA audio */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	44 #define DRIVER_NAME "alsa"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	45
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	46 /#define DEBUG_PERIOD_SIZE/
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	47
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	48 /* Audio driver functions */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	49 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	50 static void ALSA_WaitAudio(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	51 static void ALSA_PlayAudio(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	52 static Uint8 *ALSA_GetAudioBuf(_THIS);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	53 static void ALSA_CloseAudio(_THIS);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	54
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	55 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	56
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	57 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	58 static void *alsa_handle = NULL;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	59 static int alsa_loaded = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	60
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	61 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	62 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	63 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	64 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	65 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	66 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	67 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	68 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	69 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	70 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	71 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	72 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	73 static int (SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t pcm, snd_pcm_hw_params_t *params, unsigned int val);
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	74 static int (SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t params, unsigned int *val);
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	75 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);
464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	76 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);
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	77 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);
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	78 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);
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	79 static int (SDL_NAME(snd_pcm_hw_params_get_periods))(const snd_pcm_hw_params_t params, unsigned int val, int dir);
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	80 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);
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	81 static int (SDL_NAME(snd_pcm_hw_params_get_buffer_size))(const snd_pcm_hw_params_t params, snd_pcm_uframes_t *val);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	82 static int (SDL_NAME(snd_pcm_hw_params))(snd_pcm_t pcm, snd_pcm_hw_params_t *params);
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	83 /*
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	84 */
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	85 static int (SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t pcm, snd_pcm_sw_params_t *swparams);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	86 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);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	87 static int (SDL_NAME(snd_pcm_sw_params))(snd_pcm_t pcm, snd_pcm_sw_params_t *params);
1553 63fa37538842 Left the debug code more explicit Sam Lantinga <slouken@libsdl.org> parents: 1552 diff changeset	88 static int (SDL_NAME(snd_pcm_nonblock))(snd_pcm_t pcm, int nonblock);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	89 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	90 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	91
1161 05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	92 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	93 static struct {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	94 const char *name;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	95 void **func;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	96 } alsa_functions[] = {
1161 05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	97 { "snd_pcm_open", (void*)(char)&SDL_NAME(snd_pcm_open) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	98 { "snd_pcm_close", (void*)(char)&SDL_NAME(snd_pcm_close) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	99 { "snd_pcm_writei", (void*)(char)&SDL_NAME(snd_pcm_writei) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	100 { "snd_pcm_resume", (void*)(char)&SDL_NAME(snd_pcm_resume) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	101 { "snd_pcm_prepare", (void*)(char)&SDL_NAME(snd_pcm_prepare) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	102 { "snd_pcm_drain", (void*)(char)&SDL_NAME(snd_pcm_drain) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	103 { "snd_strerror", (void*)(char)&SDL_NAME(snd_strerror) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	104 { "snd_pcm_hw_params_sizeof", (void*)(char)&SDL_NAME(snd_pcm_hw_params_sizeof) },
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	105 { "snd_pcm_sw_params_sizeof", (void*)(char)&SDL_NAME(snd_pcm_sw_params_sizeof) },
1161 05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	106 { "snd_pcm_hw_params_any", (void*)(char)&SDL_NAME(snd_pcm_hw_params_any) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	107 { "snd_pcm_hw_params_set_access", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_access) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	108 { "snd_pcm_hw_params_set_format", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_format) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	109 { "snd_pcm_hw_params_set_channels", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_channels) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	110 { "snd_pcm_hw_params_get_channels", (void*)(char)&SDL_NAME(snd_pcm_hw_params_get_channels) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	111 { "snd_pcm_hw_params_set_rate_near", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	112 { "snd_pcm_hw_params_set_period_size_near", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
1553 63fa37538842 Left the debug code more explicit Sam Lantinga <slouken@libsdl.org> parents: 1552 diff changeset	113 { "snd_pcm_hw_params_get_period_size", (void*)(char)&SDL_NAME(snd_pcm_hw_params_get_period_size) },
1161 05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	114 { "snd_pcm_hw_params_set_periods_near", (void*)(char)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
1553 63fa37538842 Left the debug code more explicit Sam Lantinga <slouken@libsdl.org> parents: 1552 diff changeset	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: Sam Lantinga <slouken@libsdl.org> parents: 4332 diff changeset	116 { "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 Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	117 { "snd_pcm_hw_params_get_buffer_size", (void*)(char)&SDL_NAME(snd_pcm_hw_params_get_buffer_size) },
1161 05d4b93b911e Placate gcc's strict aliasing rules with an extra cast. Ryan C. Gordon <icculus@icculus.org> parents: 942 diff changeset	118 { "snd_pcm_hw_params", (void*)(char)&SDL_NAME(snd_pcm_hw_params) },
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	119 { "snd_pcm_sw_params_current", (void*)(char)&SDL_NAME(snd_pcm_sw_params_current) },
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	120 { "snd_pcm_sw_params_set_start_threshold", (void*)(char)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) },
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	121 { "snd_pcm_sw_params", (void*)(char)&SDL_NAME(snd_pcm_sw_params) },
1553 63fa37538842 Left the debug code more explicit Sam Lantinga <slouken@libsdl.org> parents: 1552 diff changeset	122 { "snd_pcm_nonblock", (void*)(char)&SDL_NAME(snd_pcm_nonblock) },
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	123 };
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	124
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	125 static void UnloadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	126 if (alsa_loaded) {
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	127 SDL_UnloadObject(alsa_handle);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	128 alsa_handle = NULL;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	129 alsa_loaded = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	130 }
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
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	133 static int LoadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	134 int i, retval = -1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	135
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	136 alsa_handle = SDL_LoadObject(alsa_library);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	137 if (alsa_handle) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	138 alsa_loaded = 1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	139 retval = 0;
1379 c0a74f199ecf Use only safe string functions Sam Lantinga <slouken@libsdl.org> parents: 1361 diff changeset	140 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	141 *alsa_functions[i].func = SDL_LoadFunction(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	142 if (!*alsa_functions[i].func) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	143 retval = -1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	144 UnloadALSALibrary();
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	145 break;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	146 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	147 }
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 return retval;
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
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	152 #else
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 static void UnloadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	155 return;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	156 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	157
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	158 static int LoadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	159 return 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	160 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	161
1361 19418e4422cb New configure-based build system. Still work in progress, but much improved Sam Lantinga <slouken@libsdl.org> parents: 1358 diff changeset	162 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	163
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 939 diff changeset	164 static const char *get_audio_device(int channels)
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	165 {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	166 const char *device;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	167
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	168 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	169 if ( device == NULL ) {
4334 afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	170 switch (channels) {
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	171 case 6:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	172 device = "plug:surround51";
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	173 break;
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	174 case 4:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	175 device = "plug:surround40";
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	176 break;
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	177 default:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	178 device = "default";
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	179 break;
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Sam Lantinga <slouken@libsdl.org> parents: 4333 diff changeset	180 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	181 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	182 return device;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	183 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	184
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185 /* Audio driver bootstrap functions */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	186
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	187 static int Audio_Available(void)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	188 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189 int available;
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	190 int status;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	191 snd_pcm_t *handle;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	192
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	193 available = 0;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	194 if (LoadALSALibrary() < 0) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	195 return available;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	196 }
942 41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel Sam Lantinga <slouken@libsdl.org> parents: 939 diff changeset	197 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), 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	198 if ( status >= 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	199 available = 1;
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	200 SDL_NAME(snd_pcm_close)(handle);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	201 }
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 return(available);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	204 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	205
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	206 static void Audio_DeleteDevice(SDL_AudioDevice *device)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	207 {
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	208 SDL_free(device->hidden);
3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	209 SDL_free(device);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	210 UnloadALSALibrary();
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	211 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	212
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	213 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	214 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	215 SDL_AudioDevice *this;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	216
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	217 /* 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	218 LoadALSALibrary();
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	219 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	220 if ( this ) {
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	221 SDL_memset(this, 0, (sizeof *this));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	222 this->hidden = (struct SDL_PrivateAudioData *)
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	223 SDL_malloc((sizeof *this->hidden));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	224 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	225 if ( (this == NULL) \|\| (this->hidden == NULL) ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	226 SDL_OutOfMemory();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	227 if ( this ) {
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	228 SDL_free(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	229 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	230 return(0);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	231 }
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	232 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	233
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	234 /* Set the function pointers */
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	235 this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	236 this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	237 this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	238 this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	239 this->CloseAudio = ALSA_CloseAudio;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	240
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	241 this->free = Audio_DeleteDevice;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	242
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	243 return this;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	244 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	245
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	246 AudioBootStrap ALSA_bootstrap = {
4339 819270e2f893 Don't call it "ALSA 0.9 PCM audio" anymore, since we moved to the stable API. Ryan C. Gordon <icculus@icculus.org> parents: 4337 diff changeset	247 DRIVER_NAME, "ALSA PCM audio",
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	248 Audio_Available, Audio_CreateDevice
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	249 };
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	250
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	251 /* 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	252 static void ALSA_WaitAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	253 {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	254 /* Check to see if the thread-parent process is still alive */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	255 { static int cnt = 0;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	256 /* Note that this only works with thread implementations
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	257 that use a different process id for each thread.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	258 */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	259 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	260 if ( kill(parent, 0) < 0 ) {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	261 this->enabled = 0;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	262 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	263 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	264 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	265 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	266
1878 d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	267
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	268 /*
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	269 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	270 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	271 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	272 */
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	273 #define SWIZ6(T) \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	274 T ptr = (T ) mixbuf; \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	275 const Uint32 count = (this->spec.samples / 6); \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	276 Uint32 i; \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	277 for (i = 0; i < count; i++, ptr += 6) { \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	278 T tmp; \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	279 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	280 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	281 }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	282
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	283 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	284 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	285 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	286 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	287
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	288 #undef SWIZ6
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	289
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	290
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	291 /*
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	292 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	293 * from Windows/Mac order to the format alsalib will want.
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	294 */
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	295 static __inline__ void swizzle_alsa_channels(_THIS)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	296 {
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	297 if (this->spec.channels == 6) {
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	298 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	299 if (fmtsize == 16)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	300 swizzle_alsa_channels_6_16bit(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	301 else if (fmtsize == 8)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	302 swizzle_alsa_channels_6_8bit(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	303 else if (fmtsize == 32)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	304 swizzle_alsa_channels_6_32bit(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	305 else if (fmtsize == 64)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	306 swizzle_alsa_channels_6_64bit(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	307 }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	308
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	309 /* !!! FIXME: update this for 7.1 if needed, later. */
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	310 }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	311
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	312
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	313 static void ALSA_PlayAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	314 {
4320 33d306630296 Corrected misuse of snd_pcm_writei() in ALSA driver. Ryan C. Gordon <icculus@icculus.org> parents: 4292 diff changeset	315 int status;
4332 67e799ffcadf ALSA's idea of a "frame" is the same as SDL's idea of a "sample". The frame is a single sample on a single channel, and we've defined the frames for each channel as being interleaved. Sam Lantinga <slouken@libsdl.org> parents: 4331 diff changeset	316 snd_pcm_uframes_t frames_left;
4320 33d306630296 Corrected misuse of snd_pcm_writei() in ALSA driver. Ryan C. Gordon <icculus@icculus.org> parents: 4292 diff changeset	317 const Uint8 sample_buf = (const Uint8 ) mixbuf;
4336 77b20871fd44 Thilo helped me track down the audio issue with 22050 hz stereo sound. Yay! Sam Lantinga <slouken@libsdl.org> parents: 4334 diff changeset	318 const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels;
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	319
1878 d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	320 swizzle_alsa_channels(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	321
4332 67e799ffcadf ALSA's idea of a "frame" is the same as SDL's idea of a "sample". The frame is a single sample on a single channel, and we've defined the frames for each channel as being interleaved. Sam Lantinga <slouken@libsdl.org> parents: 4331 diff changeset	322 frames_left = ((snd_pcm_uframes_t) this->spec.samples);
1878 d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio. Ryan C. Gordon <icculus@icculus.org> parents: 1553 diff changeset	323
4337 4eb6b4be1dbc Fixed bug #728 Sam Lantinga <slouken@libsdl.org> parents: 4336 diff changeset	324 while ( frames_left > 0 && this->enabled ) {
4332 67e799ffcadf ALSA's idea of a "frame" is the same as SDL's idea of a "sample". The frame is a single sample on a single channel, and we've defined the frames for each channel as being interleaved. Sam Lantinga <slouken@libsdl.org> parents: 4331 diff changeset	325 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	326 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	327 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	328 SDL_Delay(1);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	329 continue;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	330 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	331 if ( status == -ESTRPIPE ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	332 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	333 SDL_Delay(1);
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	334 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	335 } while ( status == -EAGAIN );
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 if ( status < 0 ) {
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_prepare)(pcm_handle);
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	339 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	340 if ( status < 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	341 /* 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	342 this->enabled = 0;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	343 return;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	344 }
356 a1e54d1ba16f * empty log message * Sam Lantinga <slouken@libsdl.org> parents: 354 diff changeset	345 continue;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	346 }
4336 77b20871fd44 Thilo helped me track down the audio issue with 22050 hz stereo sound. Yay! Sam Lantinga <slouken@libsdl.org> parents: 4334 diff changeset	347 sample_buf += status * frame_size;
4332 67e799ffcadf ALSA's idea of a "frame" is the same as SDL's idea of a "sample". The frame is a single sample on a single channel, and we've defined the frames for each channel as being interleaved. Sam Lantinga <slouken@libsdl.org> parents: 4331 diff changeset	348 frames_left -= status;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	349 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	350 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	351
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	352 static Uint8 *ALSA_GetAudioBuf(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	353 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	354 return(mixbuf);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	355 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	356
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	357 static void ALSA_CloseAudio(_THIS)
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	358 {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	359 if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	360 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	361 mixbuf = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	362 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	363 if ( pcm_handle ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	364 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	365 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	366 pcm_handle = NULL;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	367 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	368 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	369
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	370 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0 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 int status;
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	373 snd_pcm_hw_params_t *hwparams;
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	374 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	375 snd_pcm_format_t format;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	376 snd_pcm_uframes_t frames;
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	377 unsigned int rate;
464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	378 unsigned int 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: Sam Lantinga <slouken@libsdl.org> parents: 4332 diff changeset	379 unsigned int channels;
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	380 Uint16 test_format;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	381
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	382 /* 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	383 /* 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	384 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	385
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	386 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	387 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	388 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	389 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	390
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	391 /* Figure out what the hardware is capable of */
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	392 snd_pcm_hw_params_alloca(&hwparams);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	393 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	394 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	395 SDL_SetError("Couldn't 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	396 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	397 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	398 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	399
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	400 /* SDL only uses interleaved sample output */
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	401 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	402 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	403 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	404 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	405 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	406 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	407
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	408 /* 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	409 status = -1;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	410 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	411 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	412 switch ( test_format ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	413 case AUDIO_U8:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	414 format = SND_PCM_FORMAT_U8;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	415 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	416 case AUDIO_S8:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	417 format = SND_PCM_FORMAT_S8;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	418 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	419 case AUDIO_S16LSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	420 format = SND_PCM_FORMAT_S16_LE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	421 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	422 case AUDIO_S16MSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	423 format = SND_PCM_FORMAT_S16_BE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	424 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	425 case AUDIO_U16LSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	426 format = SND_PCM_FORMAT_U16_LE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	427 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	428 case AUDIO_U16MSB:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	429 format = SND_PCM_FORMAT_U16_BE;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	430 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	431 default:
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	432 format = 0;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	433 break;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	434 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	435 if ( format != 0 ) {
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	436 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	437 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	438 if ( status < 0 ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	439 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	440 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	441 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	442 if ( status < 0 ) {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	443 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	444 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	445 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	446 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	447 spec->format = test_format;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	448
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	449 /* Set the number of channels */
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	450 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	451 channels = spec->channels;
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	452 if ( status < 0 ) {
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	453 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	454 if ( status < 0 ) {
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	455 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	456 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	457 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	458 }
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	459 spec->channels = channels;
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	460 }
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	461
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	462 /* Set the audio rate */
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	463 rate = spec->freq;
464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	464
464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	465 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	466 if ( status < 0 ) {
865 92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200 Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	467 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	468 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	469 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	470 }
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	471 spec->freq = rate;
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	472
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	473 /* Set the buffer size, in samples */
4347 38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	474 if (getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE")) {
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	475 frames = spec->samples;
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	476 status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	477 if ( status < 0 ) {
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	478 SDL_SetError("Couldn't set period size: %s", SDL_NAME(snd_strerror)(status));
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	479 ALSA_CloseAudio(this);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	480 return(-1);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	481 }
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	482
4347 38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	483 spec->samples = frames;
4292 464126f4c7db Moved to stable ALSA API. Ryan C. Gordon <icculus@icculus.org> parents: 4159 diff changeset	484
4347 38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	485 periods = 2;
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	486 status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	487 if ( status < 0 ) {
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	488 SDL_SetError("Couldn't set period count: %s", SDL_NAME(snd_strerror)(status));
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	489 ALSA_CloseAudio(this);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	490 return(-1);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	491 }
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	492 } else {
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	493 frames = spec->samples * 2;
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	494 status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	495 if ( status < 0 ) {
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	496 SDL_SetError("Couldn't set buffer size: %s", SDL_NAME(snd_strerror)(status));
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	497 ALSA_CloseAudio(this);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	498 return(-1);
38f22ed3a433 Option to fix bug #851 Sam Lantinga <slouken@libsdl.org> parents: 4339 diff changeset	499 }
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	500 }
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	501
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	502 /* "set" the hardware with the desired parameters */
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	503 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	504 if ( status < 0 ) {
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	505 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status));
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	506 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	507 return(-1);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	508 }
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	509
1553 63fa37538842 Left the debug code more explicit Sam Lantinga <slouken@libsdl.org> parents: 1552 diff changeset	510 /* This is useful for debugging... */
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	511 #ifdef DEBUG_PERIOD_SIZE
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	512 { snd_pcm_uframes_t bufsize; snd_pcm_sframes_t persize; unsigned int periods; int dir;
a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	513 SDL_NAME(snd_pcm_hw_params_get_buffer_size)(hwparams, &bufsize);
a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	514 SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams, &persize, &dir);
a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	515 SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams, &periods, &dir);
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	516
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	517 fprintf(stderr, "ALSA: period size = %ld, periods = %u, buffer size = %lu\n", persize, periods, bufsize);
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	518 }
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	519 #endif
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	520
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	521 /* Set the software parameters */
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	522 snd_pcm_sw_params_alloca(&swparams);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	523 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	524 if ( status < 0 ) {
1552 b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	525 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	526 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	527 return(-1);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	528 }
4331 a24454ed4ac4 Fixed debug code to print correct values Sam Lantinga <slouken@libsdl.org> parents: 4329 diff changeset	529 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	530 if ( status < 0 ) {
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	531 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	532 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	533 return(-1);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	534 }
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	535 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams);
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	536 if ( status < 0 ) {
b2462b772cce Fixed bug #79 Sam Lantinga <slouken@libsdl.org> parents: 1402 diff changeset	537 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	538 ALSA_CloseAudio(this);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	539 return(-1);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	540 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	541
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	542 /* 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	543 SDL_CalculateAudioSpec(spec);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	544
354 30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	545 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	546 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	547 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	548 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	549 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9 Sam Lantinga <slouken@libsdl.org> parents: 297 diff changeset	550 return(-1);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	551 }
1336 3692456e7b0f Use SDL_ prefixed versions of C library functions. Sam Lantinga <slouken@libsdl.org> parents: 1331 diff changeset	552 SDL_memset(mixbuf, spec->silence, spec->size);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	553
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	554 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	555 parent = getpid();
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	556
765 4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of Sam Lantinga <slouken@libsdl.org> parents: 547 diff changeset	557 /* 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	558 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	559
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	560 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	561 return(0);
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	562 }

Mercurial > sdl-ios-xcode

annotate src/audio/alsa/SDL_alsa_audio.c @ 4347:38f22ed3a433 SDL-1.2