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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to the audio stream on BeOS */
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29
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30 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33 #include <SoundPlayer.h>
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34
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35 #include "SDL_BeApp.h"
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36
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37 extern "C" {
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38
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39 #include "SDL_audio.h"
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40 #include "SDL_audio_c.h"
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41 #include "SDL_sysaudio.h"
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42 #include "SDL_systhread_c.h"
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43 #include "SDL_beaudio.h"
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44
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45
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46 /* Audio driver functions */
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47 static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec);
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48 static void BE_WaitAudio(_THIS);
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49 static void BE_PlayAudio(_THIS);
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50 static Uint8 *BE_GetAudioBuf(_THIS);
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51 static void BE_CloseAudio(_THIS);
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52
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53 /* Audio driver bootstrap functions */
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54
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55 static int Audio_Available(void)
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56 {
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57 return(1);
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58 }
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59
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60 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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61 {
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62 free(device->hidden);
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63 free(device);
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64 }
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65
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66 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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67 {
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68 SDL_AudioDevice *device;
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69
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70 /* Initialize all variables that we clean on shutdown */
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71 device = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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72 if ( device ) {
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73 memset(device, 0, (sizeof *device));
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74 device->hidden = (struct SDL_PrivateAudioData *)
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75 malloc((sizeof *device->hidden));
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76 }
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77 if ( (device == NULL) || (device->hidden == NULL) ) {
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78 SDL_OutOfMemory();
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79 if ( device ) {
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80 free(device);
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81 }
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82 return(0);
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83 }
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84 memset(device->hidden, 0, (sizeof *device->hidden));
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85
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86 /* Set the function pointers */
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87 device->OpenAudio = BE_OpenAudio;
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88 device->WaitAudio = BE_WaitAudio;
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89 device->PlayAudio = BE_PlayAudio;
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90 device->GetAudioBuf = BE_GetAudioBuf;
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91 device->CloseAudio = BE_CloseAudio;
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92
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93 device->free = Audio_DeleteDevice;
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94
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95 return device;
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96 }
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97
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98 AudioBootStrap BAUDIO_bootstrap = {
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99 "baudio", "BeOS BSoundPlayer",
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100 Audio_Available, Audio_CreateDevice
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101 };
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102
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103 /* The BeOS callback for handling the audio buffer */
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104 static void FillSound(void *device, void *stream, size_t len,
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105 const media_raw_audio_format &format)
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106 {
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107 SDL_AudioDevice *audio = (SDL_AudioDevice *)device;
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108
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109 /* Silence the buffer, since it's ours */
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110 memset(stream, audio->spec.silence, len);
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111
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112 /* Only do soemthing if audio is enabled */
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113 if ( ! audio->enabled )
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114 return;
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115
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116 if ( ! audio->paused ) {
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117 if ( audio->convert.needed ) {
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118 SDL_mutexP(audio->mixer_lock);
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119 (*audio->spec.callback)(audio->spec.userdata,
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120 (Uint8 *)audio->convert.buf,audio->convert.len);
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121 SDL_mutexV(audio->mixer_lock);
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122 SDL_ConvertAudio(&audio->convert);
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123 memcpy(stream,audio->convert.buf,audio->convert.len_cvt);
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124 } else {
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125 SDL_mutexP(audio->mixer_lock);
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126 (*audio->spec.callback)(audio->spec.userdata,
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127 (Uint8 *)stream, len);
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128 SDL_mutexV(audio->mixer_lock);
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129 }
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130 }
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131 return;
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132 }
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133
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134 /* Dummy functions -- we don't use thread-based audio */
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135 void BE_WaitAudio(_THIS)
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136 {
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137 return;
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138 }
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139 void BE_PlayAudio(_THIS)
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140 {
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141 return;
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142 }
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143 Uint8 *BE_GetAudioBuf(_THIS)
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144 {
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145 return(NULL);
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146 }
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147
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148 void BE_CloseAudio(_THIS)
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149 {
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150 if ( audio_obj ) {
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151 audio_obj->Stop();
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152 delete audio_obj;
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153 audio_obj = NULL;
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154 }
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155
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156 /* Quit the Be Application, if there's nothing left to do */
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157 SDL_QuitBeApp();
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158 }
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159
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160 int BE_OpenAudio(_THIS, SDL_AudioSpec *spec)
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161 {
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162 media_raw_audio_format format;
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163
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164 /* Initialize the Be Application, if it's not already started */
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165 if ( SDL_InitBeApp() < 0 ) {
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166 return(-1);
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167 }
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168
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169 /* Parse the audio format and fill the Be raw audio format */
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170 format.frame_rate = (float)spec->freq;
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171 format.channel_count = spec->channels;
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172 switch (spec->format&~0x1000) {
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173 case AUDIO_S8:
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174 /* Signed 8-bit audio unsupported, convert to U8 */
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175 spec->format = AUDIO_U8;
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176 case AUDIO_U8:
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177 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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178 format.byte_order = 0;
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179 break;
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180 case AUDIO_U16:
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181 /* Unsigned 16-bit audio unsupported, convert to S16 */
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182 spec->format ^= 0x8000;
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183 case AUDIO_S16:
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184 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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185 if ( spec->format & 0x1000 ) {
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186 format.byte_order = 1; /* Big endian */
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187 } else {
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188 format.byte_order = 2; /* Little endian */
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189 }
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190 break;
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191 }
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192 format.buffer_size = spec->samples;
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193
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194 /* Calculate the final parameters for this audio specification */
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195 SDL_CalculateAudioSpec(spec);
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196
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197 /* Subscribe to the audio stream (creates a new thread) */
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198 { sigset_t omask;
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199 SDL_MaskSignals(&omask);
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200 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,
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201 NULL, _this);
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202 SDL_UnmaskSignals(&omask);
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203 }
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204 audio_obj->Start();
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205 audio_obj->SetHasData(true);
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206
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207 /* We're running! */
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208 return(1);
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209 }
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210
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211 }; /* Extern C */
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