annotate src/audio/windib/SDL_dibaudio.c @ 1330:450721ad5436

It's now possible to build SDL without any C runtime at all on Windows, using Visual C++ 2005
author Sam Lantinga <slouken@libsdl.org>
date Mon, 06 Feb 2006 08:28:51 +0000
parents c9b51268668f
children 3692456e7b0f
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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include "SDL_windows.h"
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26 #include <mmsystem.h>
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27
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28 #include "SDL_audio.h"
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29 #include "SDL_mutex.h"
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30 #include "SDL_timer.h"
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31 #include "SDL_stdlib.h"
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32 #include "SDL_string.h"
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33 #include "SDL_audio_c.h"
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34 #include "SDL_dibaudio.h"
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35 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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36 #include "win_ce_semaphore.h"
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37 #endif
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38
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39
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40 /* Audio driver functions */
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41 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec);
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42 static void DIB_ThreadInit(_THIS);
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43 static void DIB_WaitAudio(_THIS);
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44 static Uint8 *DIB_GetAudioBuf(_THIS);
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45 static void DIB_PlayAudio(_THIS);
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46 static void DIB_WaitDone(_THIS);
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47 static void DIB_CloseAudio(_THIS);
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48
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49 /* Audio driver bootstrap functions */
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50
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51 static int Audio_Available(void)
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52 {
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53 return(1);
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54 }
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55
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56 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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57 {
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58 free(device->hidden);
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59 free(device);
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60 }
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61
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62 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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63 {
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64 SDL_AudioDevice *this;
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65
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66 /* Initialize all variables that we clean on shutdown */
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67 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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68 if ( this ) {
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69 memset(this, 0, (sizeof *this));
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70 this->hidden = (struct SDL_PrivateAudioData *)
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71 malloc((sizeof *this->hidden));
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72 }
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73 if ( (this == NULL) || (this->hidden == NULL) ) {
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74 SDL_OutOfMemory();
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75 if ( this ) {
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76 free(this);
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77 }
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78 return(0);
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79 }
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80 memset(this->hidden, 0, (sizeof *this->hidden));
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81
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82 /* Set the function pointers */
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83 this->OpenAudio = DIB_OpenAudio;
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84 this->ThreadInit = DIB_ThreadInit;
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85 this->WaitAudio = DIB_WaitAudio;
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86 this->PlayAudio = DIB_PlayAudio;
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87 this->GetAudioBuf = DIB_GetAudioBuf;
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88 this->WaitDone = DIB_WaitDone;
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89 this->CloseAudio = DIB_CloseAudio;
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90
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91 this->free = Audio_DeleteDevice;
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92
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93 return this;
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94 }
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95
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96 AudioBootStrap WAVEOUT_bootstrap = {
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97 "waveout", "Win95/98/NT/2000 WaveOut",
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98 Audio_Available, Audio_CreateDevice
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99 };
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100
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101
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102 /* The Win32 callback for filling the WAVE device */
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103 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance,
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104 DWORD dwParam1, DWORD dwParam2)
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105 {
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106 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;
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107
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108 /* Only service "buffer done playing" messages */
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109 if ( uMsg != WOM_DONE )
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110 return;
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111
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112 /* Signal that we are done playing a buffer */
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113 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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114 ReleaseSemaphoreCE(audio_sem, 1, NULL);
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115 #else
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116 ReleaseSemaphore(audio_sem, 1, NULL);
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117 #endif
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118 }
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119
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120 static void SetMMerror(char *function, MMRESULT code)
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121 {
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122 int len;
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123 char errbuf[MAXERRORLENGTH];
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124 #ifdef _WIN32_WCE
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125 wchar_t werrbuf[MAXERRORLENGTH];
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126 #endif
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127
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128 snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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129 len = strlen(errbuf);
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130
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131 #ifdef _WIN32_WCE
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132 /* UNICODE version */
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133 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len);
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134 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL);
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135 #else
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136 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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137 #endif
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138
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139 SDL_SetError("%s",errbuf);
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140 }
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141
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142 /* Set high priority for the audio thread */
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143 static void DIB_ThreadInit(_THIS)
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144 {
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145 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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146 }
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147
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148 void DIB_WaitAudio(_THIS)
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149 {
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150 /* Wait for an audio chunk to finish */
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151 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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152 WaitForSemaphoreCE(audio_sem, INFINITE);
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153 #else
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154 WaitForSingleObject(audio_sem, INFINITE);
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155 #endif
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156 }
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157
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158 Uint8 *DIB_GetAudioBuf(_THIS)
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159 {
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160 Uint8 *retval;
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161
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162 retval = (Uint8 *)(wavebuf[next_buffer].lpData);
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163 return retval;
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164 }
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165
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166 void DIB_PlayAudio(_THIS)
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167 {
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168 /* Queue it up */
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169 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0]));
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170 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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171 }
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172
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173 void DIB_WaitDone(_THIS)
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174 {
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175 int i, left;
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176
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177 do {
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178 left = NUM_BUFFERS;
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179 for ( i=0; i<NUM_BUFFERS; ++i ) {
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180 if ( wavebuf[i].dwFlags & WHDR_DONE ) {
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181 --left;
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182 }
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183 }
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184 if ( left > 0 ) {
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185 SDL_Delay(100);
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186 }
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187 } while ( left > 0 );
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188 }
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189
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190 void DIB_CloseAudio(_THIS)
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191 {
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192 int i;
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193
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194 /* Close up audio */
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195 if ( audio_sem ) {
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196 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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197 CloseSynchHandle(audio_sem);
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198 #else
0
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199 CloseHandle(audio_sem);
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200 #endif
0
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201 }
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202 if ( sound ) {
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203 waveOutClose(sound);
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204 }
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205
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206 /* Clean up mixing buffers */
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207 for ( i=0; i<NUM_BUFFERS; ++i ) {
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208 if ( wavebuf[i].dwUser != 0xFFFF ) {
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209 waveOutUnprepareHeader(sound, &wavebuf[i],
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210 sizeof(wavebuf[i]));
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211 wavebuf[i].dwUser = 0xFFFF;
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212 }
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213 }
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214 /* Free raw mixing buffer */
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215 if ( mixbuf != NULL ) {
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216 free(mixbuf);
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217 mixbuf = NULL;
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218 }
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219 }
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220
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221 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec)
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222 {
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223 MMRESULT result;
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224 int i;
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225 WAVEFORMATEX waveformat;
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226
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227 /* Initialize the wavebuf structures for closing */
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228 sound = NULL;
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229 audio_sem = NULL;
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230 for ( i = 0; i < NUM_BUFFERS; ++i )
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231 wavebuf[i].dwUser = 0xFFFF;
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232 mixbuf = NULL;
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233
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234 /* Set basic WAVE format parameters */
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235 memset(&waveformat, 0, sizeof(waveformat));
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236 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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237
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238 /* Determine the audio parameters from the AudioSpec */
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239 switch ( spec->format & 0xFF ) {
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240 case 8:
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241 /* Unsigned 8 bit audio data */
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242 spec->format = AUDIO_U8;
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243 waveformat.wBitsPerSample = 8;
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244 break;
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245 case 16:
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246 /* Signed 16 bit audio data */
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247 spec->format = AUDIO_S16;
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248 waveformat.wBitsPerSample = 16;
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249 break;
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250 default:
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251 SDL_SetError("Unsupported audio format");
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252 return(-1);
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253 }
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254 waveformat.nChannels = spec->channels;
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255 waveformat.nSamplesPerSec = spec->freq;
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256 waveformat.nBlockAlign =
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257 waveformat.nChannels * (waveformat.wBitsPerSample/8);
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258 waveformat.nAvgBytesPerSec =
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259 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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260
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261 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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262 if ( spec->samples < (spec->freq/4) )
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263 spec->samples = ((spec->freq/4)+3)&~3;
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diff changeset
264
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265 /* Update the fragment size as size in bytes */
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266 SDL_CalculateAudioSpec(spec);
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267
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diff changeset
268 /* Open the audio device */
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269 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat,
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270 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION);
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271 if ( result != MMSYSERR_NOERROR ) {
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272 SetMMerror("waveOutOpen()", result);
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273 return(-1);
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274 }
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275
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diff changeset
276 #ifdef SOUND_DEBUG
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diff changeset
277 /* Check the sound device we retrieved */
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diff changeset
278 {
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279 WAVEOUTCAPS caps;
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diff changeset
280
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281 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps));
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diff changeset
282 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
283 SetMMerror("waveOutGetDevCaps()", result);
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diff changeset
284 return(-1);
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diff changeset
285 }
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diff changeset
286 printf("Audio device: %s\n", caps.szPname);
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diff changeset
287 }
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diff changeset
288 #endif
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diff changeset
289
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diff changeset
290 /* Create the audio buffer semaphore */
36
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
291 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
292 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
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diff changeset
293 #else
0
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294 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
36
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
295 #endif
0
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diff changeset
296 if ( audio_sem == NULL ) {
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diff changeset
297 SDL_SetError("Couldn't create semaphore");
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diff changeset
298 return(-1);
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diff changeset
299 }
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diff changeset
300
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diff changeset
301 /* Create the sound buffers */
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diff changeset
302 mixbuf = (Uint8 *)malloc(NUM_BUFFERS*spec->size);
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diff changeset
303 if ( mixbuf == NULL ) {
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diff changeset
304 SDL_SetError("Out of memory");
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diff changeset
305 return(-1);
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parents:
diff changeset
306 }
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diff changeset
307 for ( i = 0; i < NUM_BUFFERS; ++i ) {
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diff changeset
308 memset(&wavebuf[i], 0, sizeof(wavebuf[i]));
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diff changeset
309 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size];
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diff changeset
310 wavebuf[i].dwBufferLength = spec->size;
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diff changeset
311 wavebuf[i].dwFlags = WHDR_DONE;
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diff changeset
312 result = waveOutPrepareHeader(sound, &wavebuf[i],
74212992fb08 Initial revision
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diff changeset
313 sizeof(wavebuf[i]));
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diff changeset
314 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
315 SetMMerror("waveOutPrepareHeader()", result);
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parents:
diff changeset
316 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
317 }
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diff changeset
318 }
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diff changeset
319
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diff changeset
320 /* Ready to go! */
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diff changeset
321 next_buffer = 0;
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diff changeset
322 return(0);
74212992fb08 Initial revision
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parents:
diff changeset
323 }