annotate src/audio/baudio/SDL_beaudio.cc @ 3852:5b5e549382b3 SDL-1.2

Removed some new 1.3 symbols from code backported to 1.2.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 03 Sep 2006 21:34:11 +0000
parents 405a192b68e7
children a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to the audio stream on BeOS */
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25
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26 #include <SoundPlayer.h>
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27
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28 #include "../../main/beos/SDL_BeApp.h"
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29
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30 extern "C" {
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31
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32 #include "SDL_audio.h"
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33 #include "../SDL_audio_c.h"
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34 #include "../SDL_sysaudio.h"
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35 #include "../../thread/beos/SDL_systhread_c.h"
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36 #include "SDL_beaudio.h"
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37
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38
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39 /* Audio driver functions */
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40 static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec);
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41 static void BE_WaitAudio(_THIS);
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42 static void BE_PlayAudio(_THIS);
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43 static Uint8 *BE_GetAudioBuf(_THIS);
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44 static void BE_CloseAudio(_THIS);
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45
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46 /* Audio driver bootstrap functions */
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47
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48 static int Audio_Available(void)
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49 {
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50 return(1);
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51 }
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52
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53 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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54 {
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55 SDL_free(device->hidden);
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56 SDL_free(device);
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57 }
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58
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59 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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60 {
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61 SDL_AudioDevice *device;
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62
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63 /* Initialize all variables that we clean on shutdown */
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64 device = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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65 if ( device ) {
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66 SDL_memset(device, 0, (sizeof *device));
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67 device->hidden = (struct SDL_PrivateAudioData *)
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68 SDL_malloc((sizeof *device->hidden));
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69 }
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70 if ( (device == NULL) || (device->hidden == NULL) ) {
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71 SDL_OutOfMemory();
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72 if ( device ) {
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73 SDL_free(device);
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74 }
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75 return(0);
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76 }
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77 SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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78
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79 /* Set the function pointers */
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80 device->OpenAudio = BE_OpenAudio;
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81 device->WaitAudio = BE_WaitAudio;
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82 device->PlayAudio = BE_PlayAudio;
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83 device->GetAudioBuf = BE_GetAudioBuf;
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84 device->CloseAudio = BE_CloseAudio;
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85
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86 device->free = Audio_DeleteDevice;
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87
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88 return device;
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89 }
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90
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91 AudioBootStrap BAUDIO_bootstrap = {
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92 "baudio", "BeOS BSoundPlayer",
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93 Audio_Available, Audio_CreateDevice
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94 };
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95
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96 /* The BeOS callback for handling the audio buffer */
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97 static void FillSound(void *device, void *stream, size_t len,
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98 const media_raw_audio_format &format)
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99 {
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100 SDL_AudioDevice *audio = (SDL_AudioDevice *)device;
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101
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102 /* Silence the buffer, since it's ours */
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103 SDL_memset(stream, audio->spec.silence, len);
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104
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105 /* Only do soemthing if audio is enabled */
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106 if ( ! audio->enabled )
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107 return;
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108
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109 if ( ! audio->paused ) {
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110 if ( audio->convert.needed ) {
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111 SDL_mutexP(audio->mixer_lock);
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112 (*audio->spec.callback)(audio->spec.userdata,
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113 (Uint8 *)audio->convert.buf,audio->convert.len);
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114 SDL_mutexV(audio->mixer_lock);
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115 SDL_ConvertAudio(&audio->convert);
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116 SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt);
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117 } else {
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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 *)stream, len);
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121 SDL_mutexV(audio->mixer_lock);
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122 }
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123 }
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124 return;
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125 }
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126
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127 /* Dummy functions -- we don't use thread-based audio */
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128 void BE_WaitAudio(_THIS)
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129 {
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130 return;
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131 }
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132 void BE_PlayAudio(_THIS)
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133 {
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134 return;
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135 }
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136 Uint8 *BE_GetAudioBuf(_THIS)
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137 {
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138 return(NULL);
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139 }
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140
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141 void BE_CloseAudio(_THIS)
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142 {
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143 if ( audio_obj ) {
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144 audio_obj->Stop();
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145 delete audio_obj;
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146 audio_obj = NULL;
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147 }
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148
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149 /* Quit the Be Application, if there's nothing left to do */
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150 SDL_QuitBeApp();
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151 }
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152
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153 int BE_OpenAudio(_THIS, SDL_AudioSpec *spec)
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154 {
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155 int valid_datatype = 0;
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156 media_raw_audio_format format;
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157 Uint16 test_format = SDL_FirstAudioFormat(spec->format);
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158
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159 /* Parse the audio format and fill the Be raw audio format */
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160 memset(&format, '\0', sizeof (media_raw_audio_format));
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161 format.byte_order = B_MEDIA_LITTLE_ENDIAN;
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162 format.frame_rate = (float) spec->freq;
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163 format.channel_count = spec->channels; /* !!! FIXME: support > 2? */
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164 while ((!valid_datatype) && (test_format)) {
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165 valid_datatype = 1;
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166 spec->format = test_format;
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167 switch (test_format) {
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168 case AUDIO_S8:
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169 format.format = media_raw_audio_format::B_AUDIO_CHAR;
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170 break;
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171
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172 case AUDIO_U8:
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173 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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174 break;
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175
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176 case AUDIO_S16LSB:
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177 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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178 break;
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179
3851
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180 case AUDIO_S16MSB:
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181 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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182 format.byte_order = B_MEDIA_BIG_ENDIAN;
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183 break;
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184
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185 default:
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186 valid_datatype = 0;
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187 test_format = SDL_NextAudioFormat();
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188 break;
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189 }
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190 }
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191
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192 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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193 SDL_SetError("Unsupported audio format");
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194 return (-1);
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195 }
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196
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197 /* Initialize the Be Application, if it's not already started */
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198 if (SDL_InitBeApp() < 0) {
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199 return (-1);
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200 }
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201
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202 format.buffer_size = spec->samples;
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203
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204 /* Calculate the final parameters for this audio specification */
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205 SDL_CalculateAudioSpec(spec);
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206
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207 /* Subscribe to the audio stream (creates a new thread) */
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208 { sigset_t omask;
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209 SDL_MaskSignals(&omask);
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210 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,
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211 NULL, _this);
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212 SDL_UnmaskSignals(&omask);
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213 }
114
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214 if ( audio_obj->Start() == B_NO_ERROR ) {
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215 audio_obj->SetHasData(true);
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216 } else {
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217 SDL_SetError("Unable to start Be audio");
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218 return(-1);
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219 }
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220
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221 /* We're running! */
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222 return(1);
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223 }
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224
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225 }; /* Extern C */