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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
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20 slouken@devolution.com
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21
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22 This driver was written by:
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23 Erik Inge Bolsų
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24 knan@mo.himolde.no
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25 */
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26
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27 #ifdef SAVE_RCSID
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28 static char rcsid =
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29 "@(#) $Id$";
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30 #endif
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31
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32 /* Allow access to a raw mixing buffer */
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33
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34 #include <stdlib.h>
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35 #include <stdio.h>
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36 #include <string.h>
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37 #include <errno.h>
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38 #include <signal.h>
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39 #include <unistd.h>
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40
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41 #include "SDL_audio.h"
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42 #include "SDL_error.h"
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43 #include "SDL_audiomem.h"
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44 #include "SDL_audio_c.h"
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45 #include "SDL_timer.h"
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46 #include "SDL_audiodev_c.h"
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47 #include "SDL_nasaudio.h"
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48
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49 /* The tag name used by artsc audio */
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50 #define NAS_DRIVER_NAME "nas"
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51
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52 static struct SDL_PrivateAudioData *this2 = NULL;
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53
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54 /* Audio driver functions */
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55 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec);
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56 static void NAS_WaitAudio(_THIS);
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57 static void NAS_PlayAudio(_THIS);
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58 static Uint8 *NAS_GetAudioBuf(_THIS);
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59 static void NAS_CloseAudio(_THIS);
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60
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61 /* Audio driver bootstrap functions */
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62
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63 static int Audio_Available(void)
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64 {
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65 AuServer *aud = AuOpenServer("", 0, NULL, 0, NULL, NULL);
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66 if (!aud) return 0;
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67
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68 AuCloseServer(aud);
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69 return 1;
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70 }
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71
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72 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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73 {
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74 free(device->hidden);
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75 free(device);
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76 }
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77
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78 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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79 {
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80 SDL_AudioDevice *this;
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81
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82 /* Initialize all variables that we clean on shutdown */
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83 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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84 if ( this ) {
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85 memset(this, 0, (sizeof *this));
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86 this->hidden = (struct SDL_PrivateAudioData *)
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87 malloc((sizeof *this->hidden));
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88 }
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89 if ( (this == NULL) || (this->hidden == NULL) ) {
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90 SDL_OutOfMemory();
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91 if ( this ) {
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92 free(this);
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93 }
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94 return(0);
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95 }
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96 memset(this->hidden, 0, (sizeof *this->hidden));
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97
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98 /* Set the function pointers */
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99 this->OpenAudio = NAS_OpenAudio;
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100 this->WaitAudio = NAS_WaitAudio;
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101 this->PlayAudio = NAS_PlayAudio;
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102 this->GetAudioBuf = NAS_GetAudioBuf;
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103 this->CloseAudio = NAS_CloseAudio;
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104
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105 this->free = Audio_DeleteDevice;
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106
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107 return this;
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108 }
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109
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110 AudioBootStrap NAS_bootstrap = {
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111 NAS_DRIVER_NAME, "Network Audio System",
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112 Audio_Available, Audio_CreateDevice
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113 };
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114
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115 /* This function waits until it is possible to write a full sound buffer */
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116 static void NAS_WaitAudio(_THIS)
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117 {
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118 while ( this->hidden->buf_free < this->hidden->mixlen ) {
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119 AuEvent ev;
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120 AuNextEvent(this->hidden->aud, AuTrue, &ev);
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121 AuDispatchEvent(this->hidden->aud, &ev);
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122 }
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123 }
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124
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125 static void NAS_PlayAudio(_THIS)
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126 {
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127 while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events,
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128 in the hope that some of them is LowWater events telling us more
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129 of the buffer is free now than what we think. */
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130 AuEvent ev;
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131 AuNextEvent(this->hidden->aud, AuTrue, &ev);
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132 AuDispatchEvent(this->hidden->aud, &ev);
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133 }
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134 this->hidden->buf_free -= this->hidden->mixlen;
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135
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136 /* Write the audio data */
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137 AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL);
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138
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139 this->hidden->written += this->hidden->mixlen;
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140
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141 #ifdef DEBUG_AUDIO
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142 fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen);
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143 #endif
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144 }
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145
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146 static Uint8 *NAS_GetAudioBuf(_THIS)
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147 {
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148 return(this->hidden->mixbuf);
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149 }
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150
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151 static void NAS_CloseAudio(_THIS)
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152 {
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153 if ( this->hidden->mixbuf != NULL ) {
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154 SDL_FreeAudioMem(this->hidden->mixbuf);
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155 this->hidden->mixbuf = NULL;
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156 }
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157 if ( this->hidden->aud ) {
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158 AuCloseServer(this->hidden->aud);
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159 this->hidden->aud = 0;
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160 }
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161 }
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162
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163 static unsigned char sdlformat_to_auformat(unsigned int fmt)
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164 {
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165 switch (fmt)
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166 {
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167 case AUDIO_U8:
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168 return AuFormatLinearUnsigned8;
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169 case AUDIO_S8:
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170 return AuFormatLinearSigned8;
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171 case AUDIO_U16LSB:
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172 return AuFormatLinearUnsigned16LSB;
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173 case AUDIO_U16MSB:
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174 return AuFormatLinearUnsigned16MSB;
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175 case AUDIO_S16LSB:
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176 return AuFormatLinearSigned16LSB;
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177 case AUDIO_S16MSB:
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178 return AuFormatLinearSigned16MSB;
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179 }
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180 return AuNone;
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181 }
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182
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183 static AuBool
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184 event_handler(AuServer* aud, AuEvent* ev, AuEventHandlerRec* hnd)
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185 {
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186 switch (ev->type) {
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187 case AuEventTypeElementNotify: {
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188 AuElementNotifyEvent* event = (AuElementNotifyEvent *)ev;
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189
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190 switch (event->kind) {
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191 case AuElementNotifyKindLowWater:
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192 if (this2->buf_free >= 0) {
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193 this2->really += event->num_bytes;
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194 gettimeofday(&this2->last_tv, 0);
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195 this2->buf_free += event->num_bytes;
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196 } else {
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197 this2->buf_free = event->num_bytes;
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198 }
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199 break;
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200 case AuElementNotifyKindState:
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201 switch (event->cur_state) {
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202 case AuStatePause:
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203 if (event->reason != AuReasonUser) {
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204 if (this2->buf_free >= 0) {
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205 this2->really += event->num_bytes;
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206 gettimeofday(&this2->last_tv, 0);
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207 this2->buf_free += event->num_bytes;
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208 } else {
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209 this2->buf_free = event->num_bytes;
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210 }
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211 }
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212 break;
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213 }
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214 }
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215 }
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216 }
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217 return AuTrue;
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218 }
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219
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220 static AuDeviceID
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221 find_device(_THIS, int nch)
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222 {
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223 int i;
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224 for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) {
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225 if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) ==
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226 AuComponentKindPhysicalOutput) &&
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227 AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) {
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228 return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i));
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229 }
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230 }
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231 return AuNone;
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232 }
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233
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234 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec)
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235 {
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236 AuElement elms[3];
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237 int buffer_size;
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238 Uint16 test_format, format;
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239
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240 this->hidden->mixbuf = NULL;
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241
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242 /* Try for a closest match on audio format */
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243 format = 0;
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244 for ( test_format = SDL_FirstAudioFormat(spec->format);
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245 ! format && test_format; ) {
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246 format = sdlformat_to_auformat(test_format);
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247
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248 if (format == AuNone) {
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249 test_format = SDL_NextAudioFormat();
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250 }
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251 }
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252 if ( format == 0 ) {
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253 SDL_SetError("Couldn't find any hardware audio formats");
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254 return(-1);
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255 }
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256 spec->format = test_format;
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257
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258 this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL);
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259 if (this->hidden->aud == 0)
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260 {
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261 SDL_SetError("Couldn't open connection to NAS server");
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262 return (-1);
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263 }
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264
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265 this->hidden->dev = find_device(this, spec->channels);
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266 if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) {
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267 AuCloseServer(this->hidden->aud);
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268 this->hidden->aud = 0;
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269 SDL_SetError("Couldn't find a fitting playback device on NAS server");
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270 return (-1);
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271 }
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272
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273 buffer_size = spec->freq;
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274 if (buffer_size < 4096)
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275 buffer_size = 4096;
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276
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277 if (buffer_size > 32768)
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278 buffer_size = 32768; /* So that the buffer won't get unmanageably big. */
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279
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280 /* Calculate the final parameters for this audio specification */
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281 SDL_CalculateAudioSpec(spec);
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282
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283 this2 = this->hidden;
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284
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285 AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue,
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286 buffer_size, buffer_size / 4, 0, NULL);
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287 AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq,
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288 AuUnlimitedSamples, 0, NULL);
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289 AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL);
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290 AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow,
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291 event_handler, (AuPointer) NULL);
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292
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293 AuStartFlow(this->hidden->aud, this->hidden->flow, NULL);
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294
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295 /* Allocate mixing buffer */
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296 this->hidden->mixlen = spec->size;
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297 this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen);
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298 if ( this->hidden->mixbuf == NULL ) {
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299 return(-1);
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300 }
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301 memset(this->hidden->mixbuf, spec->silence, spec->size);
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302
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303 /* Get the parent process id (we're the parent of the audio thread) */
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304 this->hidden->parent = getpid();
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305
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306 /* We're ready to rock and roll. :-) */
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307 return(0);
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308 }
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