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annotate src/audio/baudio/SDL_beaudio.cc @ 3181:030899df1af5

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OK, had to add some casts to get SDL_atomic.h to compile with C++. testatomic still compiles and runs.
author Bob Pendleton <bob@pendleton.com>
date Tue, 09 Jun 2009 19:39:23 +0000
parents 99210400e8b9
children 4160ba33b597
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
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33 #include "SDL_audio.h"
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34 #include "../SDL_audio_c.h"
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35 #include "../SDL_sysaudio.h"
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36 #include "../../thread/beos/SDL_systhread_c.h"
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37 #include "SDL_beaudio.h"
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38
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39 }
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41
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42 /* !!! FIXME: have the callback call the higher level to avoid code dupe. */
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43 /* The BeOS callback for handling the audio buffer */
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44 static void
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45 FillSound(void *device, void *stream, size_t len,
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46 const media_raw_audio_format & format)
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47 {
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48 SDL_AudioDevice *audio = (SDL_AudioDevice *) device;
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49
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50 /* Silence the buffer, since it's ours */
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51 SDL_memset(stream, audio->spec.silence, len);
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52
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53 /* Only do soemthing if audio is enabled */
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54 if (!audio->enabled)
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55 return;
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56
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57 if (!audio->paused) {
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58 if (audio->convert.needed) {
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59 SDL_mutexP(audio->mixer_lock);
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60 (*audio->spec.callback) (audio->spec.userdata,
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61 (Uint8 *) audio->convert.buf,
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62 audio->convert.len);
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63 SDL_mutexV(audio->mixer_lock);
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64 SDL_ConvertAudio(&audio->convert);
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65 SDL_memcpy(stream, audio->convert.buf, audio->convert.len_cvt);
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66 } else {
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67 SDL_mutexP(audio->mixer_lock);
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68 (*audio->spec.callback) (audio->spec.userdata,
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69 (Uint8 *) stream, len);
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70 SDL_mutexV(audio->mixer_lock);
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71 }
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72 }
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73 }
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74
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75 static void
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76 BEOSAUDIO_CloseDevice(_THIS)
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77 {
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78 if (_this->hidden != NULL) {
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79 if (_this->hidden->audio_obj) {
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80 _this->hidden->audio_obj->Stop();
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81 delete _this->hidden->audio_obj;
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82 _this->hidden->audio_obj = NULL;
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83 }
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84
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85 delete _this->hidden;
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86 _this->hidden = NULL;
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87 }
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88 }
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89
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90 static int
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91 BEOSAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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92 {
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93 int valid_datatype = 0;
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94 media_raw_audio_format format;
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95 SDL_AudioFormat test_format = SDL_FirstAudioFormat(_this->spec.format);
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97 /* Initialize all variables that we clean on shutdown */
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98 _this->hidden = new SDL_PrivateAudioData;
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99 if (_this->hidden == NULL) {
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100 SDL_OutOfMemory();
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101 return 0;
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102 }
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103 SDL_memset(_this->hidden, 0, (sizeof *_this->hidden));
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104
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105 /* Parse the audio format and fill the Be raw audio format */
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106 SDL_memset(&format, '\0', sizeof(media_raw_audio_format));
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107 format.byte_order = B_MEDIA_LITTLE_ENDIAN;
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108 format.frame_rate = (float) _this->spec.freq;
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109 format.channel_count = _this->spec.channels; /* !!! FIXME: support > 2? */
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110 while ((!valid_datatype) && (test_format)) {
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111 valid_datatype = 1;
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112 _this->spec.format = test_format;
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113 switch (test_format) {
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114 case AUDIO_S8:
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115 format.format = media_raw_audio_format::B_AUDIO_CHAR;
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116 break;
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117
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118 case AUDIO_U8:
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119 format.format = media_raw_audio_format::B_AUDIO_UCHAR;
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120 break;
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121
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122 case AUDIO_S16LSB:
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123 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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124 break;
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125
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126 case AUDIO_S16MSB:
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127 format.format = media_raw_audio_format::B_AUDIO_SHORT;
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128 format.byte_order = B_MEDIA_BIG_ENDIAN;
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129 break;
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130
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131 case AUDIO_S32LSB:
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132 format.format = media_raw_audio_format::B_AUDIO_INT;
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133 break;
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134
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135 case AUDIO_S32MSB:
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136 format.format = media_raw_audio_format::B_AUDIO_INT;
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137 format.byte_order = B_MEDIA_BIG_ENDIAN;
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138 break;
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139
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140 case AUDIO_F32LSB:
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141 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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142 break;
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143
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144 case AUDIO_F32MSB:
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145 format.format = media_raw_audio_format::B_AUDIO_FLOAT;
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146 format.byte_order = B_MEDIA_BIG_ENDIAN;
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147 break;
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148
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149 default:
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150 valid_datatype = 0;
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151 test_format = SDL_NextAudioFormat();
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152 break;
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153 }
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154 }
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155
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156 format.buffer_size = _this->spec.samples;
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157
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158 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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159 BEOSAUDIO_CloseDevice(_this);
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160 SDL_SetError("Unsupported audio format");
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161 return 0;
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162 }
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163
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164 /* Calculate the final parameters for this audio specification */
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165 SDL_CalculateAudioSpec(&_this->spec);
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166
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167 /* Subscribe to the audio stream (creates a new thread) */
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168 sigset_t omask;
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169 SDL_MaskSignals(&omask);
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170 _this->hidden->audio_obj = new BSoundPlayer(&format, "SDL Audio",
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171 FillSound, NULL, _this);
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172 SDL_UnmaskSignals(&omask);
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173
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174 if (_this->hidden->audio_obj->Start() == B_NO_ERROR) {
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175 _this->hidden->audio_obj->SetHasData(true);
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176 } else {
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177 BEOSAUDIO_CloseDevice(_this);
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178 SDL_SetError("Unable to start Be audio");
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179 return 0;
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180 }
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181
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182 /* We're running! */
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183 return 1;
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184 }
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185
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186 static void
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187 BEOSAUDIO_Deinitialize(void)
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188 {
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189 SDL_QuitBeApp();
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190 }
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191
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192 static int
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193 BEOSAUDIO_Init(SDL_AudioDriverImpl * impl)
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194 {
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195 /* Initialize the Be Application, if it's not already started */
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196 if (SDL_InitBeApp() < 0) {
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197 return 0;
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198 }
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199
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200 /* Set the function pointers */
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201 impl->OpenDevice = BEOSAUDIO_OpenDevice;
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202 impl->CloseDevice = BEOSAUDIO_CloseDevice;
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203 impl->Deinitialize = BEOSAUDIO_Deinitialize;
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204 impl->ProvidesOwnCallbackThread = 1;
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205 impl->OnlyHasDefaultOutputDevice = 1;
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206
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207 return 1;
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208 }
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209
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210 extern "C"
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211 {
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212 extern AudioBootStrap BEOSAUDIO_bootstrap;
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213 }
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214 AudioBootStrap BEOSAUDIO_bootstrap = {
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215 "baudio", "BeOS BSoundPlayer", BEOSAUDIO_Init, 0
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216 };
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217
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218 /* vi: set ts=4 sw=4 expandtab: */