annotate src/audio/windib/SDL_dibaudio.c @ 1358:c71e05b4dc2e

More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 604d73db6802
children 19418e4422cb
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
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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_timer.h"
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29 #include "SDL_audio.h"
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30 #include "SDL_audio_c.h"
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31 #include "SDL_dibaudio.h"
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32 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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33 #include "win_ce_semaphore.h"
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34 #endif
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35
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36
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37 /* Audio driver functions */
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38 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec);
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39 static void DIB_ThreadInit(_THIS);
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40 static void DIB_WaitAudio(_THIS);
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41 static Uint8 *DIB_GetAudioBuf(_THIS);
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42 static void DIB_PlayAudio(_THIS);
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43 static void DIB_WaitDone(_THIS);
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44 static void DIB_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 *this;
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62
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63 /* Initialize all variables that we clean on shutdown */
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64 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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65 if ( this ) {
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66 SDL_memset(this, 0, (sizeof *this));
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67 this->hidden = (struct SDL_PrivateAudioData *)
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68 SDL_malloc((sizeof *this->hidden));
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69 }
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70 if ( (this == NULL) || (this->hidden == NULL) ) {
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71 SDL_OutOfMemory();
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72 if ( this ) {
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73 SDL_free(this);
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74 }
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75 return(0);
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76 }
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77 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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78
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79 /* Set the function pointers */
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80 this->OpenAudio = DIB_OpenAudio;
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81 this->ThreadInit = DIB_ThreadInit;
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82 this->WaitAudio = DIB_WaitAudio;
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83 this->PlayAudio = DIB_PlayAudio;
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84 this->GetAudioBuf = DIB_GetAudioBuf;
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85 this->WaitDone = DIB_WaitDone;
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86 this->CloseAudio = DIB_CloseAudio;
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87
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88 this->free = Audio_DeleteDevice;
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89
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90 return this;
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91 }
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92
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93 AudioBootStrap WAVEOUT_bootstrap = {
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94 "waveout", "Win95/98/NT/2000 WaveOut",
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95 Audio_Available, Audio_CreateDevice
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96 };
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97
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98
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99 /* The Win32 callback for filling the WAVE device */
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100 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance,
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101 DWORD dwParam1, DWORD dwParam2)
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102 {
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103 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;
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104
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105 /* Only service "buffer done playing" messages */
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106 if ( uMsg != WOM_DONE )
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107 return;
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108
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109 /* Signal that we are done playing a buffer */
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110 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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111 ReleaseSemaphoreCE(audio_sem, 1, NULL);
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112 #else
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113 ReleaseSemaphore(audio_sem, 1, NULL);
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114 #endif
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115 }
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116
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117 static void SetMMerror(char *function, MMRESULT code)
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118 {
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119 int len;
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120 char errbuf[MAXERRORLENGTH];
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121 #ifdef _WIN32_WCE
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122 wchar_t werrbuf[MAXERRORLENGTH];
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123 #endif
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124
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125 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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126 len = SDL_strlen(errbuf);
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127
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128 #ifdef _WIN32_WCE
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129 /* UNICODE version */
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130 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len);
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131 WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL);
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132 #else
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133 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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134 #endif
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135
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136 SDL_SetError("%s",errbuf);
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137 }
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138
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139 /* Set high priority for the audio thread */
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140 static void DIB_ThreadInit(_THIS)
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141 {
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142 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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143 }
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144
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145 void DIB_WaitAudio(_THIS)
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146 {
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147 /* Wait for an audio chunk to finish */
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148 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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149 WaitForSemaphoreCE(audio_sem, INFINITE);
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150 #else
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151 WaitForSingleObject(audio_sem, INFINITE);
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152 #endif
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153 }
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154
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155 Uint8 *DIB_GetAudioBuf(_THIS)
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156 {
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157 Uint8 *retval;
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158
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159 retval = (Uint8 *)(wavebuf[next_buffer].lpData);
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160 return retval;
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161 }
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162
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163 void DIB_PlayAudio(_THIS)
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164 {
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165 /* Queue it up */
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166 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0]));
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167 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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168 }
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169
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170 void DIB_WaitDone(_THIS)
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171 {
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172 int i, left;
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173
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174 do {
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175 left = NUM_BUFFERS;
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176 for ( i=0; i<NUM_BUFFERS; ++i ) {
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177 if ( wavebuf[i].dwFlags & WHDR_DONE ) {
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178 --left;
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179 }
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180 }
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181 if ( left > 0 ) {
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182 SDL_Delay(100);
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183 }
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184 } while ( left > 0 );
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185 }
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186
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187 void DIB_CloseAudio(_THIS)
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188 {
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189 int i;
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190
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191 /* Close up audio */
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192 if ( audio_sem ) {
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193 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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194 CloseSynchHandle(audio_sem);
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195 #else
0
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196 CloseHandle(audio_sem);
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197 #endif
0
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198 }
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199 if ( sound ) {
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200 waveOutClose(sound);
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201 }
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202
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203 /* Clean up mixing buffers */
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204 for ( i=0; i<NUM_BUFFERS; ++i ) {
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205 if ( wavebuf[i].dwUser != 0xFFFF ) {
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206 waveOutUnprepareHeader(sound, &wavebuf[i],
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207 sizeof(wavebuf[i]));
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208 wavebuf[i].dwUser = 0xFFFF;
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209 }
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210 }
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211 /* Free raw mixing buffer */
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212 if ( mixbuf != NULL ) {
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213 SDL_free(mixbuf);
0
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214 mixbuf = NULL;
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215 }
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216 }
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217
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218 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec)
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219 {
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220 MMRESULT result;
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221 int i;
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222 WAVEFORMATEX waveformat;
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223
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224 /* Initialize the wavebuf structures for closing */
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225 sound = NULL;
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226 audio_sem = NULL;
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227 for ( i = 0; i < NUM_BUFFERS; ++i )
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228 wavebuf[i].dwUser = 0xFFFF;
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229 mixbuf = NULL;
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230
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231 /* Set basic WAVE format parameters */
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232 SDL_memset(&waveformat, 0, sizeof(waveformat));
0
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233 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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234
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235 /* Determine the audio parameters from the AudioSpec */
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diff changeset
236 switch ( spec->format & 0xFF ) {
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diff changeset
237 case 8:
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diff changeset
238 /* Unsigned 8 bit audio data */
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diff changeset
239 spec->format = AUDIO_U8;
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240 waveformat.wBitsPerSample = 8;
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241 break;
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242 case 16:
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243 /* Signed 16 bit audio data */
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244 spec->format = AUDIO_S16;
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245 waveformat.wBitsPerSample = 16;
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246 break;
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247 default:
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248 SDL_SetError("Unsupported audio format");
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249 return(-1);
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250 }
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251 waveformat.nChannels = spec->channels;
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252 waveformat.nSamplesPerSec = spec->freq;
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diff changeset
253 waveformat.nBlockAlign =
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254 waveformat.nChannels * (waveformat.wBitsPerSample/8);
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255 waveformat.nAvgBytesPerSec =
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diff changeset
256 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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diff changeset
257
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diff changeset
258 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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259 if ( spec->samples < (spec->freq/4) )
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260 spec->samples = ((spec->freq/4)+3)&~3;
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261
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diff changeset
262 /* Update the fragment size as size in bytes */
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diff changeset
263 SDL_CalculateAudioSpec(spec);
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diff changeset
264
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diff changeset
265 /* Open the audio device */
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266 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat,
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diff changeset
267 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION);
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diff changeset
268 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
269 SetMMerror("waveOutOpen()", result);
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diff changeset
270 return(-1);
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diff changeset
271 }
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272
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diff changeset
273 #ifdef SOUND_DEBUG
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diff changeset
274 /* Check the sound device we retrieved */
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diff changeset
275 {
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diff changeset
276 WAVEOUTCAPS caps;
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diff changeset
277
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diff changeset
278 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps));
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parents:
diff changeset
279 if ( result != MMSYSERR_NOERROR ) {
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diff changeset
280 SetMMerror("waveOutGetDevCaps()", result);
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diff changeset
281 return(-1);
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parents:
diff changeset
282 }
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diff changeset
283 printf("Audio device: %s\n", caps.szPname);
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diff changeset
284 }
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diff changeset
285 #endif
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diff changeset
286
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parents:
diff changeset
287 /* Create the audio buffer semaphore */
36
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
288 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
289 audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
13ee9f4834ea Windows CE patches contributed by Rainer Loritz
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diff changeset
290 #else
0
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diff changeset
291 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
36
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diff changeset
292 #endif
0
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diff changeset
293 if ( audio_sem == NULL ) {
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diff changeset
294 SDL_SetError("Couldn't create semaphore");
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diff changeset
295 return(-1);
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parents:
diff changeset
296 }
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diff changeset
297
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diff changeset
298 /* Create the sound buffers */
1336
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parents: 1330
diff changeset
299 mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size);
0
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diff changeset
300 if ( mixbuf == NULL ) {
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parents:
diff changeset
301 SDL_SetError("Out of memory");
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parents:
diff changeset
302 return(-1);
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parents:
diff changeset
303 }
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diff changeset
304 for ( i = 0; i < NUM_BUFFERS; ++i ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1330
diff changeset
305 SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i]));
0
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diff changeset
306 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size];
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parents:
diff changeset
307 wavebuf[i].dwBufferLength = spec->size;
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diff changeset
308 wavebuf[i].dwFlags = WHDR_DONE;
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diff changeset
309 result = waveOutPrepareHeader(sound, &wavebuf[i],
74212992fb08 Initial revision
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parents:
diff changeset
310 sizeof(wavebuf[i]));
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parents:
diff changeset
311 if ( result != MMSYSERR_NOERROR ) {
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parents:
diff changeset
312 SetMMerror("waveOutPrepareHeader()", result);
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parents:
diff changeset
313 return(-1);
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parents:
diff changeset
314 }
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diff changeset
315 }
74212992fb08 Initial revision
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parents:
diff changeset
316
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parents:
diff changeset
317 /* Ready to go! */
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parents:
diff changeset
318 next_buffer = 0;
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parents:
diff changeset
319 return(0);
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parents:
diff changeset
320 }