annotate src/audio/alsa/SDL_alsa_audio.c @ 252:e8157fcb3114

Updated the source with the correct e-mail address
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Dec 2001 12:38:15 +0000
parents 74212992fb08
children f6ffac90895c
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, 1998, 1999, 2000, 2001 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
252
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20 slouken@libsdl.org
0
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21 */
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22
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23
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24
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25 /* Allow access to a raw mixing buffer */
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26
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29 #include <string.h>
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30 #include <errno.h>
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31 #include <unistd.h>
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32 #include <fcntl.h>
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33 #include <signal.h>
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34 #include <sys/types.h>
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35 #include <sys/time.h>
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36
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37 #include "SDL_audio.h"
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38 #include "SDL_error.h"
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39 #include "SDL_audiomem.h"
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40 #include "SDL_audio_c.h"
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41 #include "SDL_timer.h"
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42 #include "SDL_alsa_audio.h"
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43
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44 /* The tag name used by ALSA audio */
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45 #define DRIVER_NAME "alsa"
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46
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47 /* default card and device numbers as listed in dev/snd */
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48 static int card_no = 0;
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49 static int device_no = 0;
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50
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51 /* default channel communication parameters */
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52 #define DEFAULT_CPARAMS_RATE 22050
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53 #define DEFAULT_CPARAMS_VOICES 1
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54 #define DEFAULT_CPARAMS_FRAG_SIZE 512
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55 #define DEFAULT_CPARAMS_FRAGS_MIN 1
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56 #define DEFAULT_CPARAMS_FRAGS_MAX -1
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57
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58 /* Open the audio device for playback, and don't block if busy */
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59 #define OPEN_FLAGS (SND_PCM_OPEN_PLAYBACK|SND_PCM_OPEN_NONBLOCK)
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60
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61 /* Audio driver functions */
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62 static int PCM_OpenAudio(_THIS, SDL_AudioSpec *spec);
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63 static void PCM_WaitAudio(_THIS);
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64 static void PCM_PlayAudio(_THIS);
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65 static Uint8 *PCM_GetAudioBuf(_THIS);
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66 static void PCM_CloseAudio(_THIS);
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67
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68 /* PCM transfer channel parameters initialize function */
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69 static void init_pcm_cparams(snd_pcm_channel_params_t* cparams)
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70 {
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71 memset(cparams,0,sizeof(snd_pcm_channel_params_t));
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72
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73 cparams->channel = SND_PCM_CHANNEL_PLAYBACK;
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74 cparams->mode = SND_PCM_MODE_BLOCK;
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75 cparams->start_mode = SND_PCM_START_DATA; //_FULL
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76 cparams->stop_mode = SND_PCM_STOP_STOP;
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77 cparams->format.format = SND_PCM_SFMT_S16_LE;
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78 cparams->format.interleave = 1;
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79 cparams->format.rate = DEFAULT_CPARAMS_RATE;
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80 cparams->format.voices = DEFAULT_CPARAMS_VOICES;
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81 cparams->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE;
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82 cparams->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN;
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83 cparams->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;
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84 }
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85
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86 /* Audio driver bootstrap functions */
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87
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88 static int Audio_Available(void)
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89 /*
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90 See if we can open a nonblocking channel.
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91 Return value '1' means we can.
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92 Return value '0' means we cannot.
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93 */
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94 {
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95 int available;
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96 int rval;
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97 snd_pcm_t *handle;
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98 snd_pcm_channel_params_t cparams;
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99 #ifdef DEBUG_AUDIO
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100 snd_pcm_channel_status_t cstatus;
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101 #endif
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102
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103 available = 0;
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104 handle = NULL;
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105
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106 init_pcm_cparams(&cparams);
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107
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108 rval = snd_pcm_open(&handle, card_no, device_no, OPEN_FLAGS);
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109 if (rval >= 0)
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110 {
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111 rval = snd_pcm_plugin_params(handle, &cparams);
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112
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113 #ifdef DEBUG_AUDIO
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114 snd_pcm_plugin_status(handle, &cstatus);
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115 printf("status after snd_pcm_plugin_params call = %d\n",cstatus.status);
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116 #endif
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117 if (rval >= 0)
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118 {
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119 available = 1;
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120 }
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121 else
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122 {
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123 SDL_SetError("snd_pcm_channel_params failed: %s\n", snd_strerror (rval));
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124 }
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125
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126 if ((rval = snd_pcm_close(handle)) < 0)
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127 {
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128 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
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129 available = 0;
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130 }
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131 }
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132 else
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133 {
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134 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
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135 }
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136
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137 return(available);
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138 }
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139
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140 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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141 {
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142 free(device->hidden);
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143 free(device);
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144 }
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145
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146 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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147 {
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148 SDL_AudioDevice *this;
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149
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150 /* Initialize all variables that we clean on shutdown */
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151 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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152 if ( this ) {
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153 memset(this, 0, (sizeof *this));
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154 this->hidden = (struct SDL_PrivateAudioData *)
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155 malloc((sizeof *this->hidden));
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156 }
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157 if ( (this == NULL) || (this->hidden == NULL) ) {
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158 SDL_OutOfMemory();
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159 if ( this ) {
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160 free(this);
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161 }
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162 return(0);
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163 }
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164 memset(this->hidden, 0, (sizeof *this->hidden));
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165 audio_handle = NULL;
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166
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167 /* Set the function pointers */
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168 this->OpenAudio = PCM_OpenAudio;
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169 this->WaitAudio = PCM_WaitAudio;
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diff changeset
170 this->PlayAudio = PCM_PlayAudio;
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diff changeset
171 this->GetAudioBuf = PCM_GetAudioBuf;
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diff changeset
172 this->CloseAudio = PCM_CloseAudio;
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parents:
diff changeset
173
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parents:
diff changeset
174 this->free = Audio_DeleteDevice;
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parents:
diff changeset
175
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parents:
diff changeset
176 return this;
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parents:
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177 }
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parents:
diff changeset
178
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parents:
diff changeset
179 AudioBootStrap ALSA_bootstrap = {
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diff changeset
180 DRIVER_NAME, "ALSA PCM audio",
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parents:
diff changeset
181 Audio_Available, Audio_CreateDevice
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182 };
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parents:
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183
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parents:
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184 /* This function waits until it is possible to write a full sound buffer */
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parents:
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185 static void PCM_WaitAudio(_THIS)
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diff changeset
186 {
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parents:
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187
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parents:
diff changeset
188 /* Check to see if the thread-parent process is still alive */
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parents:
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189 { static int cnt = 0;
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diff changeset
190 /* Note that this only works with thread implementations
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parents:
diff changeset
191 that use a different process id for each thread.
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parents:
diff changeset
192 */
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parents:
diff changeset
193 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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parents:
diff changeset
194 if ( kill(parent, 0) < 0 ) {
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195 this->enabled = 0;
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parents:
diff changeset
196 }
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parents:
diff changeset
197 }
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parents:
diff changeset
198 }
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parents:
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199
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parents:
diff changeset
200 /* See if we need to use timed audio synchronization */
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parents:
diff changeset
201 if ( frame_ticks )
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parents:
diff changeset
202 {
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parents:
diff changeset
203 /* Use timer for general audio synchronization */
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204 Sint32 ticks;
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diff changeset
205
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206 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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207 if ( ticks > 0 )
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parents:
diff changeset
208 {
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diff changeset
209 SDL_Delay(ticks);
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parents:
diff changeset
210 }
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parents:
diff changeset
211 }
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parents:
diff changeset
212 else
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parents:
diff changeset
213 {
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parents:
diff changeset
214 /* Use select() for audio synchronization */
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parents:
diff changeset
215 fd_set fdset;
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parents:
diff changeset
216 struct timeval timeout;
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217 FD_ZERO(&fdset);
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218 FD_SET(audio_fd, &fdset);
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diff changeset
219 timeout.tv_sec = 10;
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diff changeset
220 timeout.tv_usec = 0;
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diff changeset
221 #ifdef DEBUG_AUDIO
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diff changeset
222 fprintf(stderr, "Waiting for audio to get ready\n");
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parents:
diff changeset
223 #endif
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parents:
diff changeset
224 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
225 {
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diff changeset
226 const char *message =
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parents:
diff changeset
227 "Audio timeout - buggy audio driver? (disabled)";
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parents:
diff changeset
228 /* In general we should never print to the screen,
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diff changeset
229 but in this case we have no other way of letting
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parents:
diff changeset
230 the user know what happened.
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parents:
diff changeset
231 */
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parents:
diff changeset
232 fprintf(stderr, "SDL: %s\n", message);
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diff changeset
233 this->enabled = 0;
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parents:
diff changeset
234 /* Don't try to close - may hang */
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parents:
diff changeset
235 audio_fd = -1;
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parents:
diff changeset
236 #ifdef DEBUG_AUDIO
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parents:
diff changeset
237 fprintf(stderr, "Done disabling audio\n");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 fprintf(stderr, "Ready!\n");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245
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parents:
diff changeset
246 static snd_pcm_channel_status_t cstatus;
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parents:
diff changeset
247
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parents:
diff changeset
248 static void PCM_PlayAudio(_THIS)
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parents:
diff changeset
249 {
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diff changeset
250 int written, rval;
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parents:
diff changeset
251
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parents:
diff changeset
252 /* Write the audio data, checking for EAGAIN (buffer full) and underrun */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 do {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
254 written = snd_pcm_plugin_write(audio_handle, pcm_buf, pcm_len);
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parents:
diff changeset
255 #ifdef DEBUG_AUDIO
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parents:
diff changeset
256 fprintf(stderr, "written = %d pcm_len = %d\n",written,pcm_len);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 if (written != pcm_len)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 if (errno == EAGAIN)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 SDL_Delay(1); /* Let a little CPU time go by and try to write again */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 fprintf(stderr, "errno == EAGAIN\n");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 else
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 if( (rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0 )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 SDL_SetError("snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 if ( (cstatus.status == SND_PCM_STATUS_UNDERRUN)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 ||(cstatus.status == SND_PCM_STATUS_READY) )
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 #ifdef DEBUG_AUDIO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 fprintf(stderr, "buffer underrun\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 if ( (rval = snd_pcm_plugin_prepare (audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n",snd_strerror(rval) );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 /* if we reach here, try to write again */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 } while ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) );
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 /* Set the next write frame */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 if ( frame_ticks ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 next_frame += frame_ticks;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 /* If we couldn't write, assume fatal error for now */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 if ( written < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 this->enabled = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 static Uint8 *PCM_GetAudioBuf(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 return(pcm_buf);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 static void PCM_CloseAudio(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 int rval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 if ( pcm_buf != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 free(pcm_buf);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 pcm_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 if ( audio_handle != NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 if ((rval = snd_pcm_plugin_flush(audio_handle,SND_PCM_CHANNEL_PLAYBACK)) < 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 SDL_SetError("snd_pcm_plugin_flush failed: %s\n",snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 if ((rval = snd_pcm_close(audio_handle)) < 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 SDL_SetError("snd_pcm_close failed: %s\n",snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 return;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 audio_handle = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 static int PCM_OpenAudio(_THIS, SDL_AudioSpec *spec)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 int rval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 snd_pcm_channel_params_t cparams;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 snd_pcm_channel_setup_t csetup;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 int format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 Uint16 test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 int twidth;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340 /* initialize channel transfer parameters to default */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
341 init_pcm_cparams(&cparams);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
342
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343 /* Reset the timer synchronization flag */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
344 frame_ticks = 0.0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
345
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
346 /* Open the audio device */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
347
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
348 rval = snd_pcm_open(&audio_handle, card_no, device_no, OPEN_FLAGS);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
349 if ( rval < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
350 SDL_SetError("snd_pcm_open failed: %s\n", snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
351 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
352 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
353
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
354 #ifdef PLUGIN_DISABLE_MMAP /* This is gone in newer versions of ALSA? */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
355 /* disable count status parameter */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
356 if ((rval = snd_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP))<0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
357 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
358 SDL_SetError("snd_plugin_set_disable failed: %s\n", snd_strerror(rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
359 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
360 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
361 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
362
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
363 pcm_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
364
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
365 /* Try for a closest match on audio format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
366 format = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
367 for ( test_format = SDL_FirstAudioFormat(spec->format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368 ! format && test_format; )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
369 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
370 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
371 fprintf(stderr, "Trying format 0x%4.4x spec->samples %d\n", test_format,spec->samples);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
372 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
373 /* if match found set format to equivalent ALSA format */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
374 switch ( test_format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
375 case AUDIO_U8:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
376 format = SND_PCM_SFMT_U8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
377 cparams.buf.block.frag_size = spec->samples * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
378 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
379 case AUDIO_S8:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
380 format = SND_PCM_SFMT_S8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
381 cparams.buf.block.frag_size = spec->samples * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
382 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
383 case AUDIO_S16LSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384 format = SND_PCM_SFMT_S16_LE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 case AUDIO_S16MSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388 format = SND_PCM_SFMT_S16_BE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
389 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 case AUDIO_U16LSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392 format = SND_PCM_SFMT_U16_LE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 case AUDIO_U16MSB:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 format = SND_PCM_SFMT_U16_BE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397 cparams.buf.block.frag_size = spec->samples*2 * spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 if ( ! format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 if ( format == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 SDL_SetError("Couldn't find any hardware audio formats");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 /* Set the audio format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 cparams.format.format = format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 /* Set mono or stereo audio (currently only two channels supported) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 cparams.format.voices = spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 printf("intializing channels %d\n", cparams.format.voices);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 /* Set rate */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 cparams.format.rate = spec->freq ;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 /* Setup the transfer parameters according to cparams */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 rval = snd_pcm_plugin_params(audio_handle, &cparams);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 if (rval < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 SDL_SetError("snd_pcm_channel_params failed: %s\n", snd_strerror (rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 /* Make sure channel is setup right one last time */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 memset( &csetup, 0, sizeof( csetup ) );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 csetup.channel = SND_PCM_CHANNEL_PLAYBACK;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 if ( snd_pcm_plugin_setup( audio_handle, &csetup ) < 0 )
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 SDL_SetError("Unable to setup playback channel\n" );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 fprintf(stderr,"requested format: %d\n",cparams.format.format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 fprintf(stderr,"requested frag size: %d\n",cparams.buf.block.frag_size);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 fprintf(stderr,"requested max frags: %d\n\n",cparams.buf.block.frags_max);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 fprintf(stderr,"real format: %d\n", csetup.format.format );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 fprintf(stderr,"real frag size : %d\n", csetup.buf.block.frag_size );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 fprintf(stderr,"real max frags : %d\n", csetup.buf.block.frags_max );
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 #endif // DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 /* Allocate memory to the audio buffer and initialize with silence
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 (Note that buffer size must be a multiple of fragment size, so find closest multiple)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 twidth = snd_pcm_format_width(format);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 if (twidth < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 printf("snd_pcm_format_width failed\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 twidth = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 printf("format is %d bits wide\n",twidth);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 pcm_len = csetup.buf.block.frag_size * (twidth/8) * csetup.format.voices ;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 printf("pcm_len set to %d\n", pcm_len);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 if (pcm_len == 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 pcm_len = csetup.buf.block.frag_size;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 pcm_buf = (Uint8*)malloc(pcm_len);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 if (pcm_buf == NULL) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 SDL_SetError("pcm_buf malloc failed\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 memset(pcm_buf,spec->silence,pcm_len);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 #ifdef DEBUG_AUDIO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 fprintf(stderr,"pcm_buf malloced and silenced.\n");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 /* get the file descriptor */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 if( (audio_fd = snd_pcm_file_descriptor(audio_handle, device_no)) < 0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 fprintf(stderr, "snd_pcm_file_descriptor failed with error code: %d\n", audio_fd);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 /* Trigger audio playback */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 rval = snd_pcm_plugin_prepare( audio_handle, SND_PCM_CHANNEL_PLAYBACK);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 if (rval < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror (rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 rval = snd_pcm_playback_go(audio_handle);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 if (rval < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 SDL_SetError("snd_pcm_playback_go failed: %s\n", snd_strerror (rval));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 /* Check to see if we need to use select() workaround */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 { char *workaround;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 workaround = getenv("SDL_DSP_NOSELECT");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 if ( workaround ) {
74212992fb08 Initial revision
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511 frame_ticks = (float)(spec->samples*1000)/spec->freq;
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512 next_frame = SDL_GetTicks()+frame_ticks;
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513 }
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514 }
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515
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516 /* Get the parent process id (we're the parent of the audio thread) */
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517 parent = getpid();
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518
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519 /* We're ready to rock and roll. :-) */
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520 return(0);
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521 }