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annotate src/audio/nas/SDL_nasaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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 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 #include "SDL_config.h"
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <signal.h>
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31 #include <unistd.h>
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32
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33 #include "SDL_timer.h"
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34 #include "SDL_audio.h"
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35 #include "../SDL_audiomem.h"
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36 #include "../SDL_audio_c.h"
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37 #include "../SDL_audiodev_c.h"
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38 #include "SDL_nasaudio.h"
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39
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40 /* The tag name used by artsc audio */
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41 #define NAS_DRIVER_NAME "nas"
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42
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43 static struct SDL_PrivateAudioData *this2 = NULL;
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44
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45 /* Audio driver functions */
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46 static int NAS_OpenAudio (_THIS, SDL_AudioSpec * spec);
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47 static void NAS_WaitAudio (_THIS);
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48 static void NAS_PlayAudio (_THIS);
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49 static Uint8 *NAS_GetAudioBuf (_THIS);
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50 static void NAS_CloseAudio (_THIS);
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51
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52 /* Audio driver bootstrap functions */
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53
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54 static int
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55 Audio_Available (void)
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56 {
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57 AuServer *aud = AuOpenServer ("", 0, NULL, 0, NULL, NULL);
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58 if (!aud)
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59 return 0;
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60
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61 AuCloseServer (aud);
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62 return 1;
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63 }
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64
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65 static void
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66 Audio_DeleteDevice (SDL_AudioDevice * device)
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67 {
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68 SDL_free (device->hidden);
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69 SDL_free (device);
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70 }
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71
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72 static SDL_AudioDevice *
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73 Audio_CreateDevice (int devindex)
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74 {
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75 SDL_AudioDevice *this;
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76
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77 /* Initialize all variables that we clean on shutdown */
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78 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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79 if (this) {
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80 SDL_memset (this, 0, (sizeof *this));
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81 this->hidden = (struct SDL_PrivateAudioData *)
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82 SDL_malloc ((sizeof *this->hidden));
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83 }
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84 if ((this == NULL) || (this->hidden == NULL)) {
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85 SDL_OutOfMemory ();
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86 if (this) {
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87 SDL_free (this);
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88 }
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89 return (0);
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90 }
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91 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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92
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93 /* Set the function pointers */
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94 this->OpenAudio = NAS_OpenAudio;
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95 this->WaitAudio = NAS_WaitAudio;
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96 this->PlayAudio = NAS_PlayAudio;
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97 this->GetAudioBuf = NAS_GetAudioBuf;
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98 this->CloseAudio = NAS_CloseAudio;
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99
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100 this->free = Audio_DeleteDevice;
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101
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102 return this;
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103 }
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104
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105 AudioBootStrap NAS_bootstrap = {
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106 NAS_DRIVER_NAME, "Network Audio System",
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107 Audio_Available, Audio_CreateDevice
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108 };
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109
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110 /* This function waits until it is possible to write a full sound buffer */
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111 static void
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112 NAS_WaitAudio (_THIS)
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113 {
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114 while (this->hidden->buf_free < this->hidden->mixlen) {
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115 AuEvent ev;
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116 AuNextEvent (this->hidden->aud, AuTrue, &ev);
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117 AuDispatchEvent (this->hidden->aud, &ev);
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118 }
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119 }
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120
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121 static void
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122 NAS_PlayAudio (_THIS)
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123 {
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124 while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events,
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125 in the hope that some of them is LowWater events telling us more
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126 of the buffer is free now than what we think. */
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127 AuEvent ev;
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128 AuNextEvent (this->hidden->aud, AuTrue, &ev);
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129 AuDispatchEvent (this->hidden->aud, &ev);
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130 }
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131 this->hidden->buf_free -= this->hidden->mixlen;
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132
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133 /* Write the audio data */
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134 AuWriteElement (this->hidden->aud, this->hidden->flow, 0,
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135 this->hidden->mixlen, this->hidden->mixbuf, AuFalse,
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136 NULL);
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137
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138 this->hidden->written += this->hidden->mixlen;
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139
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140 #ifdef DEBUG_AUDIO
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141 fprintf (stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen);
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142 #endif
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143 }
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144
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145 static Uint8 *
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146 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
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152 NAS_CloseAudio (_THIS)
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153 {
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154 if (this->hidden->mixbuf != NULL) {
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155 SDL_FreeAudioMem (this->hidden->mixbuf);
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156 this->hidden->mixbuf = NULL;
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157 }
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158 if (this->hidden->aud) {
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159 AuCloseServer (this->hidden->aud);
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160 this->hidden->aud = 0;
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161 }
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162 }
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163
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164 static unsigned char
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165 sdlformat_to_auformat (unsigned int fmt)
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166 {
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167 switch (fmt) {
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168 case AUDIO_U8:
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169 return AuFormatLinearUnsigned8;
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170 case AUDIO_S8:
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171 return AuFormatLinearSigned8;
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172 case AUDIO_U16LSB:
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173 return AuFormatLinearUnsigned16LSB;
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174 case AUDIO_U16MSB:
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175 return AuFormatLinearUnsigned16MSB;
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176 case AUDIO_S16LSB:
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177 return AuFormatLinearSigned16LSB;
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178 case AUDIO_S16MSB:
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179 return AuFormatLinearSigned16MSB;
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180 }
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181 return AuNone;
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182 }
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183
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184 static AuBool
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185 event_handler (AuServer * aud, AuEvent * ev, AuEventHandlerRec * hnd)
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186 {
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187 switch (ev->type) {
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188 case AuEventTypeElementNotify:
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189 {
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190 AuElementNotifyEvent *event = (AuElementNotifyEvent *) ev;
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191
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192 switch (event->kind) {
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193 case AuElementNotifyKindLowWater:
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194 if (this2->buf_free >= 0) {
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195 this2->really += event->num_bytes;
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196 gettimeofday (&this2->last_tv, 0);
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197 this2->buf_free += event->num_bytes;
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198 } else {
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199 this2->buf_free = event->num_bytes;
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200 }
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201 break;
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202 case AuElementNotifyKindState:
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203 switch (event->cur_state) {
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204 case AuStatePause:
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205 if (event->reason != AuReasonUser) {
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206 if (this2->buf_free >= 0) {
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207 this2->really += event->num_bytes;
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208 gettimeofday (&this2->last_tv, 0);
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209 this2->buf_free += event->num_bytes;
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210 } else {
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211 this2->buf_free = event->num_bytes;
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212 }
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213 }
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214 break;
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215 }
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216 }
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217 }
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218 }
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219 return AuTrue;
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220 }
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221
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222 static AuDeviceID
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223 find_device (_THIS, int nch)
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224 {
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225 int i;
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226 for (i = 0; i < AuServerNumDevices (this->hidden->aud); i++) {
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227 if ((AuDeviceKind (AuServerDevice (this->hidden->aud, i)) ==
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228 AuComponentKindPhysicalOutput) &&
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229 AuDeviceNumTracks (AuServerDevice (this->hidden->aud, i)) ==
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230 nch) {
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231 return AuDeviceIdentifier (AuServerDevice (this->hidden->aud, i));
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232 }
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233 }
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234 return AuNone;
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235 }
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236
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237 static int
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238 NAS_OpenAudio (_THIS, SDL_AudioSpec * spec)
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239 {
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240 AuElement elms[3];
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241 int buffer_size;
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242 Uint16 test_format, format;
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243
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244 this->hidden->mixbuf = NULL;
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245
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246 /* Try for a closest match on audio format */
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247 format = 0;
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248 for (test_format = SDL_FirstAudioFormat (spec->format);
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249 !format && test_format;) {
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250 format = sdlformat_to_auformat (test_format);
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251
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252 if (format == AuNone) {
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253 test_format = SDL_NextAudioFormat ();
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254 }
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255 }
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256 if (format == 0) {
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257 SDL_SetError ("Couldn't find any hardware audio formats");
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258 return (-1);
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259 }
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260 spec->format = test_format;
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261
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262 this->hidden->aud = AuOpenServer ("", 0, NULL, 0, NULL, NULL);
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263 if (this->hidden->aud == 0) {
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264 SDL_SetError ("Couldn't open connection to NAS server");
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265 return (-1);
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266 }
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267
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268 this->hidden->dev = find_device (this, spec->channels);
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269 if ((this->hidden->dev == AuNone)
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270 || (!(this->hidden->flow = AuCreateFlow (this->hidden->aud, NULL)))) {
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271 AuCloseServer (this->hidden->aud);
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272 this->hidden->aud = 0;
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273 SDL_SetError
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274 ("Couldn't find a fitting playback device on NAS server");
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275 return (-1);
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276 }
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277
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278 buffer_size = spec->freq;
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279 if (buffer_size < 4096)
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280 buffer_size = 4096;
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281
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282 if (buffer_size > 32768)
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283 buffer_size = 32768; /* So that the buffer won't get unmanageably big. */
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284
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285 /* Calculate the final parameters for this audio specification */
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286 SDL_CalculateAudioSpec (spec);
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287
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288 this2 = this->hidden;
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289
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290 AuMakeElementImportClient (elms, spec->freq, format, spec->channels,
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291 AuTrue, buffer_size, buffer_size / 4, 0, NULL);
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292 AuMakeElementExportDevice (elms + 1, 0, this->hidden->dev, spec->freq,
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293 AuUnlimitedSamples, 0, NULL);
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294 AuSetElements (this->hidden->aud, this->hidden->flow, AuTrue, 2, elms,
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295 NULL);
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296 AuRegisterEventHandler (this->hidden->aud, AuEventHandlerIDMask, 0,
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297 this->hidden->flow, event_handler,
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298 (AuPointer) NULL);
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299
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300 AuStartFlow (this->hidden->aud, this->hidden->flow, NULL);
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301
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302 /* Allocate mixing buffer */
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303 this->hidden->mixlen = spec->size;
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304 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem (this->hidden->mixlen);
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305 if (this->hidden->mixbuf == NULL) {
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306 return (-1);
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307 }
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308 SDL_memset (this->hidden->mixbuf, spec->silence, spec->size);
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309
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310 /* Get the parent process id (we're the parent of the audio thread) */
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311 this->hidden->parent = getpid ();
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312
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313 /* We're ready to rock and roll. :-) */
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314 return (0);
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315 }
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316
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317 /* vi: set ts=4 sw=4 expandtab: */