annotate src/audio/alsa/SDL_alsa_audio.c @ 4336:77b20871fd44 SDL-1.2

Thilo helped me track down the audio issue with 22050 hz stereo sound. Yay!
author Sam Lantinga <slouken@libsdl.org>
date Wed, 14 Oct 2009 07:34:35 +0000
parents afadcd7d2319
children 4eb6b4be1dbc
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 /* Whether we should set the buffer size or the period size */
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47 /*#define SET_PERIOD_SIZE*/
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48 /*#define DEBUG_PERIOD_SIZE*/
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49
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50 /* Audio driver functions */
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51 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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52 static void ALSA_WaitAudio(_THIS);
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53 static void ALSA_PlayAudio(_THIS);
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54 static Uint8 *ALSA_GetAudioBuf(_THIS);
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55 static void ALSA_CloseAudio(_THIS);
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56
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57 #ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC
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58
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59 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
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60 static void *alsa_handle = NULL;
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61 static int alsa_loaded = 0;
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62
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63 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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64 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm);
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65 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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66 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm);
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67 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm);
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68 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm);
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69 static const char *(*SDL_NAME(snd_strerror))(int errnum);
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70 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void);
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71 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void);
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72 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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73 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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74 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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75 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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76 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params, unsigned int *val);
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77 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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78 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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79 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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80 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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81 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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82 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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83 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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84 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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85 /*
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86 */
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87 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams);
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88 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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89 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
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90 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock);
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91 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
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92 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
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93
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94 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
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95 static struct {
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96 const char *name;
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97 void **func;
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98 } alsa_functions[] = {
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99 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) },
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100 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) },
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101 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) },
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102 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) },
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103 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) },
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104 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) },
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105 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) },
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106 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) },
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107 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) },
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108 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) },
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109 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) },
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110 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) },
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111 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) },
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112 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) },
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113 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) },
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114 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) },
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115 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) },
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116 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) },
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117 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) },
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118 { "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
119 { "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
120 { "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
121 { "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
122 { "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
123 { "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
124 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) },
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parents: 769
diff changeset
125 };
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parents: 769
diff changeset
126
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parents: 769
diff changeset
127 static void UnloadALSALibrary(void) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
128 if (alsa_loaded) {
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
129 SDL_UnloadObject(alsa_handle);
865
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diff changeset
130 alsa_handle = NULL;
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diff changeset
131 alsa_loaded = 0;
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parents: 769
diff changeset
132 }
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Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
133 }
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Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
134
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
135 static int LoadALSALibrary(void) {
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parents: 769
diff changeset
136 int i, retval = -1;
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parents: 769
diff changeset
137
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
138 alsa_handle = SDL_LoadObject(alsa_library);
865
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parents: 769
diff changeset
139 if (alsa_handle) {
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parents: 769
diff changeset
140 alsa_loaded = 1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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diff changeset
141 retval = 0;
1379
c0a74f199ecf Use only safe string functions
Sam Lantinga <slouken@libsdl.org>
parents: 1361
diff changeset
142 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
143 *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);
865
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parents: 769
diff changeset
144 if (!*alsa_functions[i].func) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
145 retval = -1;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
146 UnloadALSALibrary();
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
147 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
148 }
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Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
149 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
150 }
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
151 return retval;
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Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
152 }
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parents: 769
diff changeset
153
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parents: 769
diff changeset
154 #else
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
155
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
156 static void UnloadALSALibrary(void) {
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parents: 769
diff changeset
157 return;
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parents: 769
diff changeset
158 }
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parents: 769
diff changeset
159
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
160 static int LoadALSALibrary(void) {
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diff changeset
161 return 0;
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parents: 769
diff changeset
162 }
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parents: 769
diff changeset
163
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
164 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
865
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165
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
166 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
167 {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
168 const char *device;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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diff changeset
169
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
170 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
171 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
172 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
173 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
174 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
175 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
176 case 4:
afadcd7d2319 Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion.
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parents: 4333
diff changeset
177 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
178 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
179 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
180 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
181 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
182 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
183 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
184 return device;
0
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parents:
diff changeset
185 }
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parents:
diff changeset
186
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parents:
diff changeset
187 /* Audio driver bootstrap functions */
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parents:
diff changeset
188
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parents:
diff changeset
189 static int Audio_Available(void)
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parents:
diff changeset
190 {
74212992fb08 Initial revision
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parents:
diff changeset
191 int available;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
192 int status;
0
74212992fb08 Initial revision
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parents:
diff changeset
193 snd_pcm_t *handle;
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parents:
diff changeset
194
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parents:
diff changeset
195 available = 0;
865
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parents: 769
diff changeset
196 if (LoadALSALibrary() < 0) {
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
197 return available;
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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parents: 769
diff changeset
198 }
942
41a59de7f2ed Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
Sam Lantinga <slouken@libsdl.org>
parents: 939
diff changeset
199 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
200 if ( status >= 0 ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
201 available = 1;
865
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diff changeset
202 SDL_NAME(snd_pcm_close)(handle);
0
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parents:
diff changeset
203 }
865
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diff changeset
204 UnloadALSALibrary();
0
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parents:
diff changeset
205 return(available);
74212992fb08 Initial revision
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parents:
diff changeset
206 }
74212992fb08 Initial revision
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parents:
diff changeset
207
74212992fb08 Initial revision
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parents:
diff changeset
208 static void Audio_DeleteDevice(SDL_AudioDevice *device)
74212992fb08 Initial revision
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parents:
diff changeset
209 {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
210 SDL_free(device->hidden);
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
211 SDL_free(device);
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
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diff changeset
212 UnloadALSALibrary();
0
74212992fb08 Initial revision
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parents:
diff changeset
213 }
74212992fb08 Initial revision
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parents:
diff changeset
214
74212992fb08 Initial revision
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parents:
diff changeset
215 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
74212992fb08 Initial revision
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parents:
diff changeset
216 {
74212992fb08 Initial revision
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parents:
diff changeset
217 SDL_AudioDevice *this;
74212992fb08 Initial revision
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parents:
diff changeset
218
74212992fb08 Initial revision
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parents:
diff changeset
219 /* Initialize all variables that we clean on shutdown */
865
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parents: 769
diff changeset
220 LoadALSALibrary();
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
221 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
0
74212992fb08 Initial revision
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parents:
diff changeset
222 if ( this ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
223 SDL_memset(this, 0, (sizeof *this));
0
74212992fb08 Initial revision
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parents:
diff changeset
224 this->hidden = (struct SDL_PrivateAudioData *)
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
225 SDL_malloc((sizeof *this->hidden));
0
74212992fb08 Initial revision
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parents:
diff changeset
226 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
227 if ( (this == NULL) || (this->hidden == NULL) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
228 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
229 if ( this ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
230 SDL_free(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
231 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
234 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
74212992fb08 Initial revision
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parents:
diff changeset
235
74212992fb08 Initial revision
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parents:
diff changeset
236 /* Set the function pointers */
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
237 this->OpenAudio = ALSA_OpenAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
238 this->WaitAudio = ALSA_WaitAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
239 this->PlayAudio = ALSA_PlayAudio;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
240 this->GetAudioBuf = ALSA_GetAudioBuf;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
241 this->CloseAudio = ALSA_CloseAudio;
0
74212992fb08 Initial revision
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parents:
diff changeset
242
74212992fb08 Initial revision
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parents:
diff changeset
243 this->free = Audio_DeleteDevice;
74212992fb08 Initial revision
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parents:
diff changeset
244
74212992fb08 Initial revision
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parents:
diff changeset
245 return this;
74212992fb08 Initial revision
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parents:
diff changeset
246 }
74212992fb08 Initial revision
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parents:
diff changeset
247
74212992fb08 Initial revision
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parents:
diff changeset
248 AudioBootStrap ALSA_bootstrap = {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
249 DRIVER_NAME, "ALSA 0.9 PCM audio",
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
250 Audio_Available, Audio_CreateDevice
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 };
74212992fb08 Initial revision
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parents:
diff changeset
252
74212992fb08 Initial revision
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parents:
diff changeset
253 /* 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
254 static void ALSA_WaitAudio(_THIS)
0
74212992fb08 Initial revision
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parents:
diff changeset
255 {
74212992fb08 Initial revision
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parents:
diff changeset
256 /* Check to see if the thread-parent process is still alive */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 { static int cnt = 0;
74212992fb08 Initial revision
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parents:
diff changeset
258 /* Note that this only works with thread implementations
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 that use a different process id for each thread.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 if ( kill(parent, 0) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 this->enabled = 0;
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264 }
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265 }
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266 }
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267 }
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268
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269
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270 /*
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271 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
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272 * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE
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273 * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR"
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274 */
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275 #define SWIZ6(T) \
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276 T *ptr = (T *) mixbuf; \
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277 const Uint32 count = (this->spec.samples / 6); \
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278 Uint32 i; \
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279 for (i = 0; i < count; i++, ptr += 6) { \
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280 T tmp; \
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281 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
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282 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
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283 }
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284
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285 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); }
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286 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); }
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287 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); }
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288 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); }
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289
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290 #undef SWIZ6
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291
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292
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293 /*
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294 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
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295 * from Windows/Mac order to the format alsalib will want.
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296 */
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297 static __inline__ void swizzle_alsa_channels(_THIS)
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298 {
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299 if (this->spec.channels == 6) {
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300 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
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301 if (fmtsize == 16)
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302 swizzle_alsa_channels_6_16bit(this);
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303 else if (fmtsize == 8)
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304 swizzle_alsa_channels_6_8bit(this);
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305 else if (fmtsize == 32)
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306 swizzle_alsa_channels_6_32bit(this);
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307 else if (fmtsize == 64)
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308 swizzle_alsa_channels_6_64bit(this);
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309 }
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310
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311 /* !!! FIXME: update this for 7.1 if needed, later. */
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312 }
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313
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314
354
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315 static void ALSA_PlayAudio(_THIS)
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316 {
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317 int status;
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318 snd_pcm_uframes_t frames_left;
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319 const Uint8 *sample_buf = (const Uint8 *) mixbuf;
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320 const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels;
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321
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322 swizzle_alsa_channels(this);
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323
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324 frames_left = ((snd_pcm_uframes_t) this->spec.samples);
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325
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326 while ( frames_left > 0 ) {
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327 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left);
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328 if ( status < 0 ) {
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329 if ( status == -EAGAIN ) {
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330 SDL_Delay(1);
354
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331 continue;
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332 }
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333 if ( status == -ESTRPIPE ) {
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334 do {
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335 SDL_Delay(1);
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336 status = SDL_NAME(snd_pcm_resume)(pcm_handle);
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337 } while ( status == -EAGAIN );
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338 }
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339 if ( status < 0 ) {
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340 status = SDL_NAME(snd_pcm_prepare)(pcm_handle);
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341 }
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342 if ( status < 0 ) {
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343 /* Hmm, not much we can do - abort */
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344 this->enabled = 0;
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345 return;
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346 }
356
a1e54d1ba16f *** empty log message ***
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347 continue;
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348 }
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349 sample_buf += status * frame_size;
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350 frames_left -= status;
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351 }
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352 }
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353
354
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354 static Uint8 *ALSA_GetAudioBuf(_THIS)
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355 {
354
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356 return(mixbuf);
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357 }
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358
354
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359 static void ALSA_CloseAudio(_THIS)
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360 {
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361 if ( mixbuf != NULL ) {
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362 SDL_FreeAudioMem(mixbuf);
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363 mixbuf = NULL;
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364 }
354
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365 if ( pcm_handle ) {
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366 SDL_NAME(snd_pcm_drain)(pcm_handle);
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367 SDL_NAME(snd_pcm_close)(pcm_handle);
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368 pcm_handle = NULL;
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369 }
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370 }
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371
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372 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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373 {
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374 int status;
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375 snd_pcm_hw_params_t *hwparams;
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376 snd_pcm_sw_params_t *swparams;
354
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diff changeset
377 snd_pcm_format_t format;
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378 snd_pcm_uframes_t frames;
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diff changeset
379 unsigned int rate;
4333
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380 #ifdef SET_PERIOD_SIZE
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381 unsigned int periods;
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382 #endif
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383 unsigned int channels;
354
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384 Uint16 test_format;
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385
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386 /* Open the audio device */
942
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diff changeset
387 /* Name of device should depend on # channels in spec */
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diff changeset
388 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
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diff changeset
389
354
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diff changeset
390 if ( status < 0 ) {
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391 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status));
354
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diff changeset
392 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
393 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
394
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
395 /* Figure out what the hardware is capable of */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
396 snd_pcm_hw_params_alloca(&hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
397 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
398 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
399 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
400 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
401 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
402 }
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
403
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
404 /* SDL only uses interleaved sample output */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
405 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
406 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
407 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
408 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 /* 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
413 status = -1;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 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
415 test_format && (status < 0); ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
416 switch ( test_format ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 case AUDIO_U8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
418 format = SND_PCM_FORMAT_U8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 case AUDIO_S8:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
421 format = SND_PCM_FORMAT_S8;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 case AUDIO_S16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
424 format = SND_PCM_FORMAT_S16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 case AUDIO_S16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
427 format = SND_PCM_FORMAT_S16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 case AUDIO_U16LSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
430 format = SND_PCM_FORMAT_U16_LE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 case AUDIO_U16MSB:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
433 format = SND_PCM_FORMAT_U16_BE;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
436 format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
439 if ( format != 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
440 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
441 }
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 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 }
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
446 if ( status < 0 ) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 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
448 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
453 /* Set the number of channels */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
454 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
455 channels = spec->channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
456 if ( status < 0 ) {
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
457 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
458 if ( status < 0 ) {
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
459 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
460 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
461 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
462 }
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
463 spec->channels = channels;
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
464 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
466 /* Set the audio rate */
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
467 rate = spec->freq;
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
468
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
469 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
470 if ( status < 0 ) {
865
92615154bb68 Date: Sun, 29 Feb 2004 15:14:22 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
471 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
472 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
473 return(-1);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
474 }
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
475 spec->freq = rate;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
477 /* Set the buffer size, in samples */
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
478 #ifdef SET_PERIOD_SIZE
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
479 frames = spec->samples;
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
480 status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL);
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
481 if ( status < 0 ) {
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
482 SDL_SetError("Couldn't set period size: %s", SDL_NAME(snd_strerror)(status));
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
483 ALSA_CloseAudio(this);
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
484 return(-1);
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
485 }
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
486
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
487 spec->samples = frames;
4292
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
488
464126f4c7db Moved to stable ALSA API.
Ryan C. Gordon <icculus@icculus.org>
parents: 4159
diff changeset
489 periods = 2;
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
490 status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL);
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
491 if ( status < 0 ) {
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
492 SDL_SetError("Couldn't set period count: %s", SDL_NAME(snd_strerror)(status));
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
493 ALSA_CloseAudio(this);
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
494 return(-1);
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
495 }
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
496 #else
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
497 frames = spec->samples * 2;
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
498 status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames);
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
499 #endif
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
500
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
501 /* "set" the hardware with the desired parameters */
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
502 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
503 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
504 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
505 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
506 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
507 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
508
1553
63fa37538842 Left the debug code more explicit
Sam Lantinga <slouken@libsdl.org>
parents: 1552
diff changeset
509 /* 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
510 #ifdef DEBUG_PERIOD_SIZE
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
511 { 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
512 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
513 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
514 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
515
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
516 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
517 }
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
518 #endif
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
519
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
520 /* Set the software parameters */
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
521 snd_pcm_sw_params_alloca(&swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
522 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
523 if ( status < 0 ) {
1552
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
524 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
525 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
526 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
527 }
4331
a24454ed4ac4 Fixed debug code to print correct values
Sam Lantinga <slouken@libsdl.org>
parents: 4329
diff changeset
528 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
529 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
530 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
531 ALSA_CloseAudio(this);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
532 return(-1);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
533 }
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
534 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams);
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
535 if ( status < 0 ) {
b2462b772cce Fixed bug #79
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
536 SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status));
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
537 ALSA_CloseAudio(this);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
539 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
540
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
541 /* 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
542 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
543
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
544 /* Allocate mixing buffer */
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
545 mixlen = spec->size;
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
546 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
547 if ( mixbuf == NULL ) {
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
548 ALSA_CloseAudio(this);
30935e76acb5 Updated ALSA audio support for ALSA 0.9
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parents: 297
diff changeset
549 return(-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1331
diff changeset
551 SDL_memset(mixbuf, spec->silence, spec->size);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
552
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
553 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
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parents:
diff changeset
554 parent = getpid();
74212992fb08 Initial revision
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parents:
diff changeset
555
765
4c2ba6161939 Editors Note: The original patch was modified to use SDL_Delay() instead of
Sam Lantinga <slouken@libsdl.org>
parents: 547
diff changeset
556 /* 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
557 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
558
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
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parents:
diff changeset
560 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
561 }