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annotate src/audio/windib/SDL_dibaudio.c @ 5182:f652a24a2e99

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These aren't executable files. :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 04 Feb 2011 23:31:56 -0800
parents 327f181542f1
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include "../../core/windows/SDL_windows.h"
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27 #include <mmsystem.h>
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audio_c.h"
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32 #include "SDL_dibaudio.h"
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33 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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34 #include "win_ce_semaphore.h"
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35 #endif
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36
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37 #if defined(_WIN32_WCE)
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38 #define WINDOWS_OS_NAME "Windows CE/PocketPC"
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39 #elif defined(WIN64)
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40 #define WINDOWS_OS_NAME "Win64"
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41 #else
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42 #define WINDOWS_OS_NAME "Win32"
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43 #endif
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44
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45 /* The Win32 callback for filling the WAVE device */
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46 static void CALLBACK
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47 FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
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48 DWORD dwParam1, DWORD dwParam2)
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49 {
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50 SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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51
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52 /* Only service "buffer done playing" messages */
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53 if (uMsg != WOM_DONE)
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54 return;
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55
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56 /* Signal that we are done playing a buffer */
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57 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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58 ReleaseSemaphoreCE(this->hidden->audio_sem, 1, NULL);
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59 #else
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60 ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
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61 #endif
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62 }
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63
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64 static void
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65 SetMMerror(char *function, MMRESULT code)
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66 {
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67 size_t len;
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68 char errbuf[MAXERRORLENGTH];
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69 wchar_t werrbuf[MAXERRORLENGTH];
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70
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71 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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72 len = SDL_strlen(errbuf);
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73
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74 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH - len);
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75 WideCharToMultiByte(CP_ACP, 0, werrbuf, -1, errbuf + len,
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76 MAXERRORLENGTH - len, NULL, NULL);
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77
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78 SDL_SetError("%s", errbuf);
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79 }
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80
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81 /* Set high priority for the audio thread */
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82 static void
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83 WINWAVEOUT_ThreadInit(_THIS)
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84 {
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85 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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86 }
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87
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88 void
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89 WINWAVEOUT_WaitDevice(_THIS)
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90 {
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91 /* Wait for an audio chunk to finish */
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92 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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93 WaitForSemaphoreCE(this->hidden->audio_sem, INFINITE);
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94 #else
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95 WaitForSingleObject(this->hidden->audio_sem, INFINITE);
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96 #endif
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97 }
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98
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99 Uint8 *
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100 WINWAVEOUT_GetDeviceBuf(_THIS)
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101 {
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102 return (Uint8 *) (this->hidden->
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103 wavebuf[this->hidden->next_buffer].lpData);
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104 }
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105
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106 void
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107 WINWAVEOUT_PlayDevice(_THIS)
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108 {
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109 /* Queue it up */
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110 waveOutWrite(this->hidden->sound,
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111 &this->hidden->wavebuf[this->hidden->next_buffer],
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112 sizeof(this->hidden->wavebuf[0]));
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113 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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114 }
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115
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116 void
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117 WINWAVEOUT_WaitDone(_THIS)
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118 {
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119 int i, left;
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120
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121 do {
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122 left = NUM_BUFFERS;
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123 for (i = 0; i < NUM_BUFFERS; ++i) {
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124 if (this->hidden->wavebuf[i].dwFlags & WHDR_DONE) {
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125 --left;
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126 }
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127 }
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128 if (left > 0) {
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129 SDL_Delay(100);
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130 }
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131 } while (left > 0);
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132 }
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133
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134 void
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135 WINWAVEOUT_CloseDevice(_THIS)
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136 {
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137 /* Close up audio */
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138 if (this->hidden != NULL) {
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139 int i;
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140
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141 if (this->hidden->audio_sem) {
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142 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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143 CloseSynchHandle(this->hidden->audio_sem);
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144 #else
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145 CloseHandle(this->hidden->audio_sem);
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146 #endif
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147 this->hidden->audio_sem = 0;
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148 }
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149
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150 if (this->hidden->sound) {
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151 waveOutClose(this->hidden->sound);
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152 this->hidden->sound = 0;
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153 }
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154
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155 /* Clean up mixing buffers */
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156 for (i = 0; i < NUM_BUFFERS; ++i) {
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157 if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
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158 waveOutUnprepareHeader(this->hidden->sound,
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159 &this->hidden->wavebuf[i],
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160 sizeof(this->hidden->wavebuf[i]));
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161 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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162 }
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163 }
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164
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165 if (this->hidden->mixbuf != NULL) {
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166 /* Free raw mixing buffer */
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167 SDL_free(this->hidden->mixbuf);
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168 this->hidden->mixbuf = NULL;
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169 }
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170
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171 SDL_free(this->hidden);
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172 this->hidden = NULL;
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173 }
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174 }
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175
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176 int
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177 WINWAVEOUT_OpenDevice(_THIS, const char *devname, int iscapture)
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178 {
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179 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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180 int valid_datatype = 0;
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181 MMRESULT result;
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182 WAVEFORMATEX waveformat;
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183 int i;
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184
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185 /* Initialize all variables that we clean on shutdown */
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186 this->hidden = (struct SDL_PrivateAudioData *)
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187 SDL_malloc((sizeof *this->hidden));
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188 if (this->hidden == NULL) {
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189 SDL_OutOfMemory();
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190 return 0;
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191 }
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192 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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193
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194 /* Initialize the wavebuf structures for closing */
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195 for (i = 0; i < NUM_BUFFERS; ++i)
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196 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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197
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198 while ((!valid_datatype) && (test_format)) {
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199 valid_datatype = 1;
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200 this->spec.format = test_format;
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201 switch (test_format) {
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202 case AUDIO_U8:
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203 case AUDIO_S16:
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204 case AUDIO_S32:
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205 break; /* valid. */
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206
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207 default:
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208 valid_datatype = 0;
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209 test_format = SDL_NextAudioFormat();
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210 break;
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211 }
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212 }
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213
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214 if (!valid_datatype) {
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215 WINWAVEOUT_CloseDevice(this);
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216 SDL_SetError("Unsupported audio format");
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217 return 0;
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218 }
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219
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220 /* Set basic WAVE format parameters */
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221 SDL_memset(&waveformat, '\0', sizeof(waveformat));
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222 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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223 waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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224
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225 if (this->spec.channels > 2)
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226 this->spec.channels = 2; /* !!! FIXME: is this right? */
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227
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228 waveformat.nChannels = this->spec.channels;
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229 waveformat.nSamplesPerSec = this->spec.freq;
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230 waveformat.nBlockAlign =
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231 waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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232 waveformat.nAvgBytesPerSec =
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233 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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234
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235 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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236 if (this->spec.samples < (this->spec.freq / 4))
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237 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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238
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239 /* Update the fragment size as size in bytes */
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240 SDL_CalculateAudioSpec(&this->spec);
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241
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242 /* Open the audio device */
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243 result = waveOutOpen(&this->hidden->sound, WAVE_MAPPER, &waveformat,
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244 (DWORD_PTR) FillSound, (DWORD_PTR) this,
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245 CALLBACK_FUNCTION);
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246 if (result != MMSYSERR_NOERROR) {
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247 WINWAVEOUT_CloseDevice(this);
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248 SetMMerror("waveOutOpen()", result);
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249 return 0;
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250 }
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251 #ifdef SOUND_DEBUG
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252 /* Check the sound device we retrieved */
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253 {
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254 WAVEOUTCAPS caps;
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255
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256 result = waveOutGetDevCaps((UINT) this->hidden->sound,
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257 &caps, sizeof(caps));
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258 if (result != MMSYSERR_NOERROR) {
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259 WINWAVEOUT_CloseDevice(this);
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260 SetMMerror("waveOutGetDevCaps()", result);
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261 return 0;
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262 }
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263 printf("Audio device: %s\n", caps.szPname);
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264 }
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265 #endif
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266
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267 /* Create the audio buffer semaphore */
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268 this->hidden->audio_sem =
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269 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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270 CreateSemaphoreCE(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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271 #else
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272 CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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273 #endif
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274 if (this->hidden->audio_sem == NULL) {
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275 WINWAVEOUT_CloseDevice(this);
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276 SDL_SetError("Couldn't create semaphore");
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277 return 0;
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278 }
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279
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280 /* Create the sound buffers */
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281 this->hidden->mixbuf =
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282 (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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283 if (this->hidden->mixbuf == NULL) {
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284 WINWAVEOUT_CloseDevice(this);
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285 SDL_OutOfMemory();
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286 return 0;
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287 }
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288 for (i = 0; i < NUM_BUFFERS; ++i) {
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289 SDL_memset(&this->hidden->wavebuf[i], '\0',
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290 sizeof(this->hidden->wavebuf[i]));
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291 this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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292 this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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293 this->hidden->wavebuf[i].lpData =
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294 (LPSTR) & this->hidden->mixbuf[i * this->spec.size];
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295 result = waveOutPrepareHeader(this->hidden->sound,
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296 &this->hidden->wavebuf[i],
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297 sizeof(this->hidden->wavebuf[i]));
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298 if (result != MMSYSERR_NOERROR) {
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299 WINWAVEOUT_CloseDevice(this);
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300 SetMMerror("waveOutPrepareHeader()", result);
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301 return 0;
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302 }
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303 }
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304
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305 return 1; /* Ready to go! */
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306 }
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307
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308
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309 static int
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310 WINWAVEOUT_Init(SDL_AudioDriverImpl * impl)
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311 {
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312 /* Set the function pointers */
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313 impl->OpenDevice = WINWAVEOUT_OpenDevice;
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314 impl->ThreadInit = WINWAVEOUT_ThreadInit;
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315 impl->PlayDevice = WINWAVEOUT_PlayDevice;
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316 impl->WaitDevice = WINWAVEOUT_WaitDevice;
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317 impl->WaitDone = WINWAVEOUT_WaitDone;
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318 impl->GetDeviceBuf = WINWAVEOUT_GetDeviceBuf;
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319 impl->CloseDevice = WINWAVEOUT_CloseDevice;
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320 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Is this true? */
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321
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322 return 1; /* this audio target is available. */
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323 }
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324
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325 AudioBootStrap WINWAVEOUT_bootstrap = {
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326 "waveout", WINDOWS_OS_NAME " WaveOut", WINWAVEOUT_Init, 0
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327 };
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328
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329 /* vi: set ts=4 sw=4 expandtab: */