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annotate src/audio/alsa/SDL_alsa_audio.c @ 4360:be2dff2f79c0 SDL-1.2

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Getting as close as you can with periods is better than the default parameters.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 19 Oct 2009 03:18:15 +0000
parents 4b582c04ec1d
children 991e4bcfc7a8
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include <sys/types.h>
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27 #include <signal.h> /* For kill() */
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audiomem.h"
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32 #include "../SDL_audio_c.h"
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33 #include "SDL_alsa_audio.h"
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34
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35 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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36 #include "SDL_name.h"
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37 #include "SDL_loadso.h"
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38 #else
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39 #define SDL_NAME(X) X
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40 #endif
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41
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42
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43 /* The tag name used by ALSA audio */
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44 #define DRIVER_NAME "alsa"
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45
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46 /* Audio driver functions */
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47 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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48 static void ALSA_WaitAudio(_THIS);
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49 static void ALSA_PlayAudio(_THIS);
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50 static Uint8 *ALSA_GetAudioBuf(_THIS);
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51 static void ALSA_CloseAudio(_THIS);
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52
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53 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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54
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55 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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56 static void *alsa_handle = NULL;
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57 static int alsa_loaded = 0;
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58
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59 static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode);
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60 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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61 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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62 static int (*SDL_NAME(snd_pcm_recover))(snd_pcm_t *pcm, int err, int silent);
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63 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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64 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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65 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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66 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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67 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void);
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68 static void (*SDL_NAME(snd_pcm_hw_params_copy))(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src);
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69 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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70 static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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71 static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
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72 static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
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73 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params, unsigned int *val);
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74 static int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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75 static int (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir);
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76 static int (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
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77 static int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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78 static int (*SDL_NAME(snd_pcm_hw_params_get_periods))(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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79 static int (*SDL_NAME(snd_pcm_hw_params_set_buffer_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
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80 static int (*SDL_NAME(snd_pcm_hw_params_get_buffer_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
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81 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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82 /*
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83 */
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84 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams);
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85 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
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86 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
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87 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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88 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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89 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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90
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91 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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92 static struct {
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93 const char *name;
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94 void **func;
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95 } alsa_functions[] = {
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96 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) },
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97 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) },
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98 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) },
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99 { "snd_pcm_recover", (void**)(char*)&SDL_NAME(snd_pcm_recover) },
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100 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) },
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101 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) },
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102 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) },
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103 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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104 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) },
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105 { "snd_pcm_hw_params_copy", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_copy) },
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106 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) },
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107 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) },
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108 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) },
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109 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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110 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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111 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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112 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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113 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) },
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114 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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115 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) },
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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
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parents: 769
diff changeset
123 };
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parents: 769
diff changeset
124
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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
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diff changeset
128 alsa_handle = NULL;
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diff changeset
129 alsa_loaded = 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
130 }
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parents: 769
diff changeset
131 }
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parents: 769
diff changeset
132
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parents: 769
diff changeset
133 static int LoadALSALibrary(void) {
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diff changeset
134 int i, retval = -1;
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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
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diff changeset
137 if (alsa_handle) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
138 alsa_loaded = 1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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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
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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
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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
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parents: 769
diff changeset
149 return retval;
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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
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parents: 769
diff changeset
153
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
154 static void UnloadALSALibrary(void) {
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parents: 769
diff changeset
155 return;
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parents: 769
diff changeset
156 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
157
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
158 static int LoadALSALibrary(void) {
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parents: 769
diff changeset
159 return 0;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
160 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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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
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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
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parents: 297
diff changeset
165 {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
166 const char *device;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
167
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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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
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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
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parents: 297
diff changeset
182 return device;
0
74212992fb08 Initial revision
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parents:
diff changeset
183 }
74212992fb08 Initial revision
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parents:
diff changeset
184
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parents:
diff changeset
185 /* Audio driver bootstrap functions */
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parents:
diff changeset
186
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parents:
diff changeset
187 static int Audio_Available(void)
74212992fb08 Initial revision
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parents:
diff changeset
188 {
74212992fb08 Initial revision
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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
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parents:
diff changeset
191 snd_pcm_t *handle;
74212992fb08 Initial revision
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parents:
diff changeset
192
74212992fb08 Initial revision
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parents:
diff changeset
193 available = 0;
865
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parents: 769
diff changeset
194 if (LoadALSALibrary() < 0) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
195 return available;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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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
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parents: 297
diff changeset
199 available = 1;
865
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diff changeset
200 SDL_NAME(snd_pcm_close)(handle);
0
74212992fb08 Initial revision
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parents:
diff changeset
201 }
865
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parents: 769
diff changeset
202 UnloadALSALibrary();
0
74212992fb08 Initial revision
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parents:
diff changeset
203 return(available);
74212992fb08 Initial revision
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parents:
diff changeset
204 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
205
74212992fb08 Initial revision
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parents:
diff changeset
206 static void Audio_DeleteDevice(SDL_AudioDevice *device)
74212992fb08 Initial revision
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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
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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
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parents:
diff changeset
213 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
74212992fb08 Initial revision
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parents:
diff changeset
214 {
74212992fb08 Initial revision
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parents:
diff changeset
215 SDL_AudioDevice *this;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
216
74212992fb08 Initial revision
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parents:
diff changeset
217 /* Initialize all variables that we clean on shutdown */
865
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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
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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
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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 {
4359
4b582c04ec1d Recoomendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4358
diff changeset
254 /* We're in blocking mode, so there's nothing to do here */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256
1878
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
Ryan C. Gordon <icculus@icculus.org>
parents: 1553
diff changeset
257
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
Ryan C. Gordon <icculus@icculus.org>
parents: 1553
diff changeset
258 /*
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
Ryan C. Gordon <icculus@icculus.org>
parents: 1553
diff changeset
259 * 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
260 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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261 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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262 */
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263 #define SWIZ6(T) \
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diff changeset
264 T *ptr = (T *) mixbuf; \
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265 const Uint32 count = (this->spec.samples / 6); \
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266 Uint32 i; \
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267 for (i = 0; i < count; i++, ptr += 6) { \
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268 T tmp; \
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269 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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270 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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271 }
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272
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273 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); }
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274 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); }
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275 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); }
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276 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); }
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277
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278 #undef SWIZ6
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279
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280
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281 /*
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282 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
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283 * from Windows/Mac order to the format alsalib will want.
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284 */
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285 static __inline__ void swizzle_alsa_channels(_THIS)
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286 {
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287 if (this->spec.channels == 6) {
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288 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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289 if (fmtsize == 16)
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290 swizzle_alsa_channels_6_16bit(this);
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291 else if (fmtsize == 8)
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292 swizzle_alsa_channels_6_8bit(this);
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
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293 else if (fmtsize == 32)
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
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294 swizzle_alsa_channels_6_32bit(this);
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295 else if (fmtsize == 64)
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296 swizzle_alsa_channels_6_64bit(this);
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297 }
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298
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299 /* !!! FIXME: update this for 7.1 if needed, later. */
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300 }
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
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301
d7c9d7f42881 Swizzle ALSA channels for 5.1 output to match DirectSound and CoreAudio.
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302
354
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diff changeset
303 static void ALSA_PlayAudio(_THIS)
0
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304 {
4320
33d306630296 Corrected misuse of snd_pcm_writei() in ALSA driver.
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diff changeset
305 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.
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diff changeset
306 snd_pcm_uframes_t frames_left;
4320
33d306630296 Corrected misuse of snd_pcm_writei() in ALSA driver.
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diff changeset
307 const Uint8 *sample_buf = (const Uint8 *) mixbuf;
4336
77b20871fd44 Thilo helped me track down the audio issue with 22050 hz stereo sound. Yay!
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diff changeset
308 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
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diff changeset
309
1878
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diff changeset
310 swizzle_alsa_channels(this);
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311
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.
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diff changeset
312 frames_left = ((snd_pcm_uframes_t) this->spec.samples);
1878
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313
4337
4eb6b4be1dbc Fixed bug #728
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diff changeset
314 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>
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315 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
316 if ( status < 0 ) {
4358
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317 if ( SDL_NAME(snd_pcm_recover)(pcm_handle, status, 0) < 0 ) {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
318 /* Hmm, not much we can do - abort */
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diff changeset
319 this->enabled = 0;
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diff changeset
320 return;
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74212992fb08 Initial revision
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diff changeset
321 }
356
a1e54d1ba16f *** empty log message ***
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diff changeset
322 continue;
0
74212992fb08 Initial revision
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diff changeset
323 }
4336
77b20871fd44 Thilo helped me track down the audio issue with 22050 hz stereo sound. Yay!
Sam Lantinga <slouken@libsdl.org>
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diff changeset
324 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.
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diff changeset
325 frames_left -= status;
0
74212992fb08 Initial revision
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diff changeset
326 }
74212992fb08 Initial revision
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diff changeset
327 }
74212992fb08 Initial revision
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diff changeset
328
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
329 static Uint8 *ALSA_GetAudioBuf(_THIS)
0
74212992fb08 Initial revision
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diff changeset
330 {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
331 return(mixbuf);
0
74212992fb08 Initial revision
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parents:
diff changeset
332 }
74212992fb08 Initial revision
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diff changeset
333
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
334 static void ALSA_CloseAudio(_THIS)
0
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parents:
diff changeset
335 {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
336 if ( mixbuf != NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
337 SDL_FreeAudioMem(mixbuf);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
338 mixbuf = NULL;
0
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diff changeset
339 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
340 if ( pcm_handle ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
341 SDL_NAME(snd_pcm_drain)(pcm_handle);
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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diff changeset
342 SDL_NAME(snd_pcm_close)(pcm_handle);
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
343 pcm_handle = NULL;
0
74212992fb08 Initial revision
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diff changeset
344 }
74212992fb08 Initial revision
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diff changeset
345 }
74212992fb08 Initial revision
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diff changeset
346
4357
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diff changeset
347 static int ALSA_finalize_hardware(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *hwparams, int override)
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diff changeset
348 {
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
349 int status;
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
350 snd_pcm_uframes_t bufsize;
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diff changeset
351
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
352 /* "set" the hardware with the desired parameters */
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diff changeset
353 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams);
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
354 if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
355 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
356 }
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
357
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
358 /* Get samples for the actual buffer size */
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diff changeset
359 status = SDL_NAME(snd_pcm_hw_params_get_buffer_size)(hwparams, &bufsize);
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diff changeset
360 if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
361 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
362 }
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
363 if ( !override && bufsize != spec->samples * 2 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
364 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
365 }
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
366
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
367 /* FIXME: Is this safe to do? */
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
368 spec->samples = bufsize / 2;
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diff changeset
369
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
370 /* This is useful for debugging */
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
371 if ( getenv("SDL_AUDIO_ALSA_DEBUG") ) {
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
372 snd_pcm_sframes_t persize = 0;
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
373 unsigned int periods = 0;
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
374
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
375 SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams, &persize, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
376 SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams, &periods, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
377
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
378 fprintf(stderr, "ALSA: period size = %ld, periods = %u, buffer size = %lu\n", persize, periods, bufsize);
a10dac5858fe Recommendation from Lennart Poettering:
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diff changeset
379 }
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
380 return(0);
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
381 }
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
382
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
383 static int ALSA_set_period_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override)
4357
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
384 {
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
385 const char *env;
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
386 int status;
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
387 snd_pcm_hw_params_t *hwparams;
a10dac5858fe Recommendation from Lennart Poettering:
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parents: 4349
diff changeset
388 snd_pcm_uframes_t frames;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
389 unsigned int periods;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
390
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
391 /* Copy the hardware parameters for this setup */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
392 snd_pcm_hw_params_alloca(&hwparams);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
393 SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
394
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
395 if ( !override ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
396 env = getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE");
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
397 if ( env ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
398 override = SDL_atoi(env);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
399 if ( override == 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
400 return(-1);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
401 }
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
402 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
403 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
404
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
405 frames = spec->samples;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
406 status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
407 if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
408 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
409 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
410
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
411 periods = 2;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
412 status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
413 if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
414 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
415 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
416
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
417 return ALSA_finalize_hardware(this, spec, hwparams, override);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
418 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
419
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
420 static int ALSA_set_buffer_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override)
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
421 {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
422 const char *env;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
423 int status;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
424 snd_pcm_hw_params_t *hwparams;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
425 snd_pcm_uframes_t frames;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
426
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
427 /* Copy the hardware parameters for this setup */
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
428 snd_pcm_hw_params_alloca(&hwparams);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
429 SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
430
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
431 if ( !override ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
432 env = getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE");
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
433 if ( env ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
434 override = SDL_atoi(env);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
435 if ( override == 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
436 return(-1);
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
437 }
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
438 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
439 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
440
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
441 frames = spec->samples * 2;
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
442 status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
443 if ( status < 0 ) {
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
444 return(-1);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
445 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
446
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
447 return ALSA_finalize_hardware(this, spec, hwparams, override);
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
448 }
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
449
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
450 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
452 int status;
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
453 snd_pcm_hw_params_t *hwparams;
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
454 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
455 snd_pcm_format_t format;
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
456 unsigned int rate;
4333
55717a755897 Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
Sam Lantinga <slouken@libsdl.org>
parents: 4332
diff changeset
457 unsigned int channels;
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
458 snd_pcm_uframes_t bufsize;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
459 Uint16 test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 /* 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
462 /* 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
463 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
464
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
465 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
466 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
467 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
468 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
469
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
470 /* Figure out what the hardware is capable of */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
471 snd_pcm_hw_params_alloca(&hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
472 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
473 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
474 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
475 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
476 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
477 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
478
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
479 /* SDL only uses interleaved sample output */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
480 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
481 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
482 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
483 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 /* 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
488 status = -1;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 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
490 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
491 switch ( test_format ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
493 format = SND_PCM_FORMAT_U8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
496 format = SND_PCM_FORMAT_S8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
499 format = SND_PCM_FORMAT_S16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
502 format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
505 format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
508 format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
511 format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
514 if ( format != 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
515 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
516 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
517 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
519 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
520 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
521 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
522 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
523 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
524 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
528 /* Set the number of channels */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
529 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
530 channels = spec->channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
531 if ( status < 0 ) {
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
532 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
533 if ( status < 0 ) {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
534 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
535 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
536 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
537 }
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
538 spec->channels = channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
539 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
541 /* Set the audio rate */
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
542 rate = spec->freq;
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
543
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
544 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
545 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
546 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
547 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
548 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
549 }
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
550 spec->freq = rate;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
551
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
552 /* Set the buffer size, in samples */
4360
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
553 if ( ALSA_set_period_size(this, spec, hwparams, 0) < 0 &&
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
554 ALSA_set_buffer_size(this, spec, hwparams, 0) < 0 ) {
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
555 /* Failed to set desired buffer size, do the best you can... */
be2dff2f79c0 Getting as close as you can with periods is better than the default parameters.
Sam Lantinga <slouken@libsdl.org>
parents: 4359
diff changeset
556 if ( ALSA_set_period_size(this, spec, hwparams, 1) < 0 ) {
4357
a10dac5858fe Recommendation from Lennart Poettering:
Sam Lantinga <slouken@libsdl.org>
parents: 4349
diff changeset
557 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status));
4347
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
558 ALSA_CloseAudio(this);
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
559 return(-1);
38f22ed3a433 Option to fix bug #851
Sam Lantinga <slouken@libsdl.org>
parents: 4339
diff changeset
560 }
4348
b312352d8c8d Enable the ALSA debug code via environment variable
Sam Lantinga <slouken@libsdl.org>
parents: 4347
diff changeset
561 }
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
562
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
563 /* Set the software parameters */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
564 snd_pcm_sw_params_alloca(&swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
565 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
566 if ( status < 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
567 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
568 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
569 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
570 }
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
571 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
572 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
573 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
574 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
575 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
576 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
577 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
578 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
579 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
580 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
582 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
584 /* 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
585 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
587 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
588 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
589 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
590 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
591 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
592 return(-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
593 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
594 SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
595
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
596 /* 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
597 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
598
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
599 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
600 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
601 }