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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <windows.h>
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33 #include <mmsystem.h>
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34
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35 #include "SDL_audio.h"
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36 #include "SDL_mutex.h"
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37 #include "SDL_timer.h"
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38 #include "SDL_audio_c.h"
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39 #include "SDL_dibaudio.h"
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40
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41
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42 /* Audio driver functions */
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43 static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec);
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44 static void DIB_ThreadInit(_THIS);
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45 static void DIB_WaitAudio(_THIS);
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46 static Uint8 *DIB_GetAudioBuf(_THIS);
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47 static void DIB_PlayAudio(_THIS);
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48 static void DIB_WaitDone(_THIS);
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49 static void DIB_CloseAudio(_THIS);
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50
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51 /* Audio driver bootstrap functions */
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52
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53 static int Audio_Available(void)
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54 {
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55 return(1);
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56 }
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57
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58 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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59 {
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60 free(device->hidden);
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61 free(device);
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62 }
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63
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64 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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65 {
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66 SDL_AudioDevice *this;
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67
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68 /* Initialize all variables that we clean on shutdown */
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69 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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70 if ( this ) {
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71 memset(this, 0, (sizeof *this));
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72 this->hidden = (struct SDL_PrivateAudioData *)
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73 malloc((sizeof *this->hidden));
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74 }
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75 if ( (this == NULL) || (this->hidden == NULL) ) {
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76 SDL_OutOfMemory();
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77 if ( this ) {
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78 free(this);
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79 }
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80 return(0);
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81 }
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82 memset(this->hidden, 0, (sizeof *this->hidden));
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83
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84 /* Set the function pointers */
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85 this->OpenAudio = DIB_OpenAudio;
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86 this->ThreadInit = DIB_ThreadInit;
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87 this->WaitAudio = DIB_WaitAudio;
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88 this->PlayAudio = DIB_PlayAudio;
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89 this->GetAudioBuf = DIB_GetAudioBuf;
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90 this->WaitDone = DIB_WaitDone;
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91 this->CloseAudio = DIB_CloseAudio;
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92
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93 this->free = Audio_DeleteDevice;
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94
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95 return this;
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96 }
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97
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98 AudioBootStrap WAVEOUT_bootstrap = {
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99 "waveout", "Win95/98/NT/2000 WaveOut",
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100 Audio_Available, Audio_CreateDevice
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101 };
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102
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103
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104 /* The Win32 callback for filling the WAVE device */
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105 static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance,
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106 DWORD dwParam1, DWORD dwParam2)
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107 {
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108 SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;
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109
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110 /* Only service "buffer done playing" messages */
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111 if ( uMsg != WOM_DONE )
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112 return;
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113
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114 /* Signal that we are done playing a buffer */
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115 ReleaseSemaphore(audio_sem, 1, NULL);
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116 }
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117
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118 static void SetMMerror(char *function, MMRESULT code)
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119 {
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120 int len;
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121 char errbuf[MAXERRORLENGTH];
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122
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123 sprintf(errbuf, "%s: ", function);
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124 len = strlen(errbuf);
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125 waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
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126 SDL_SetError("%s", errbuf);
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127 }
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128
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129 /* Set high priority for the audio thread */
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130 static void DIB_ThreadInit(_THIS)
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131 {
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132 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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133 }
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134
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135 void DIB_WaitAudio(_THIS)
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136 {
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137 /* Wait for an audio chunk to finish */
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138 WaitForSingleObject(audio_sem, INFINITE);
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139 }
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140
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141 Uint8 *DIB_GetAudioBuf(_THIS)
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142 {
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143 Uint8 *retval;
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144
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145 retval = (Uint8 *)(wavebuf[next_buffer].lpData);
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146 return retval;
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147 }
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148
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149 void DIB_PlayAudio(_THIS)
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150 {
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151 /* Queue it up */
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152 waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0]));
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153 next_buffer = (next_buffer+1)%NUM_BUFFERS;
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154 }
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155
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156 void DIB_WaitDone(_THIS)
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157 {
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158 int i, left;
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159
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160 do {
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161 left = NUM_BUFFERS;
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162 for ( i=0; i<NUM_BUFFERS; ++i ) {
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163 if ( wavebuf[i].dwFlags & WHDR_DONE ) {
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164 --left;
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165 }
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166 }
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167 if ( left > 0 ) {
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168 SDL_Delay(100);
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169 }
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170 } while ( left > 0 );
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171 }
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172
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173 void DIB_CloseAudio(_THIS)
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174 {
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175 int i;
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176
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177 /* Close up audio */
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178 if ( audio_sem ) {
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179 CloseHandle(audio_sem);
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180 }
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181 if ( sound ) {
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182 waveOutClose(sound);
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183 }
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184
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185 /* Clean up mixing buffers */
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186 for ( i=0; i<NUM_BUFFERS; ++i ) {
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187 if ( wavebuf[i].dwUser != 0xFFFF ) {
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188 waveOutUnprepareHeader(sound, &wavebuf[i],
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189 sizeof(wavebuf[i]));
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190 wavebuf[i].dwUser = 0xFFFF;
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191 }
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192 }
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193 /* Free raw mixing buffer */
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194 if ( mixbuf != NULL ) {
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195 free(mixbuf);
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196 mixbuf = NULL;
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197 }
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198 }
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199
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200 int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec)
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201 {
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202 MMRESULT result;
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203 int i;
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204 WAVEFORMATEX waveformat;
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205
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206 /* Initialize the wavebuf structures for closing */
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207 sound = NULL;
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208 audio_sem = NULL;
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209 for ( i = 0; i < NUM_BUFFERS; ++i )
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210 wavebuf[i].dwUser = 0xFFFF;
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211 mixbuf = NULL;
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212
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213 /* Set basic WAVE format parameters */
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214 memset(&waveformat, 0, sizeof(waveformat));
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215 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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216
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217 /* Determine the audio parameters from the AudioSpec */
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218 switch ( spec->format & 0xFF ) {
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219 case 8:
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220 /* Unsigned 8 bit audio data */
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221 spec->format = AUDIO_U8;
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222 waveformat.wBitsPerSample = 8;
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223 break;
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224 case 16:
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225 /* Signed 16 bit audio data */
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226 spec->format = AUDIO_S16;
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227 waveformat.wBitsPerSample = 16;
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228 break;
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229 default:
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230 SDL_SetError("Unsupported audio format");
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231 return(-1);
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232 }
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233 waveformat.nChannels = spec->channels;
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234 waveformat.nSamplesPerSec = spec->freq;
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235 waveformat.nBlockAlign =
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236 waveformat.nChannels * (waveformat.wBitsPerSample/8);
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237 waveformat.nAvgBytesPerSec =
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238 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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239
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240 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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241 if ( spec->samples < (spec->freq/4) )
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242 spec->samples = ((spec->freq/4)+3)&~3;
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243
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244 /* Update the fragment size as size in bytes */
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245 SDL_CalculateAudioSpec(spec);
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246
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247 /* Open the audio device */
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248 result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat,
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249 (DWORD)FillSound, (DWORD)this, CALLBACK_FUNCTION);
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250 if ( result != MMSYSERR_NOERROR ) {
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251 SetMMerror("waveOutOpen()", result);
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252 return(-1);
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253 }
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254
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255 #ifdef SOUND_DEBUG
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256 /* Check the sound device we retrieved */
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257 {
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258 WAVEOUTCAPS caps;
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259
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260 result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps));
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261 if ( result != MMSYSERR_NOERROR ) {
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262 SetMMerror("waveOutGetDevCaps()", result);
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263 return(-1);
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264 }
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265 printf("Audio device: %s\n", caps.szPname);
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266 }
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267 #endif
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268
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269 /* Create the audio buffer semaphore */
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270 audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
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271 if ( audio_sem == NULL ) {
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272 SDL_SetError("Couldn't create semaphore");
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273 return(-1);
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274 }
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275
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276 /* Create the sound buffers */
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277 mixbuf = (Uint8 *)malloc(NUM_BUFFERS*spec->size);
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278 if ( mixbuf == NULL ) {
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279 SDL_SetError("Out of memory");
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280 return(-1);
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281 }
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282 for ( i = 0; i < NUM_BUFFERS; ++i ) {
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283 memset(&wavebuf[i], 0, sizeof(wavebuf[i]));
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284 wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size];
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285 wavebuf[i].dwBufferLength = spec->size;
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286 wavebuf[i].dwFlags = WHDR_DONE;
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287 result = waveOutPrepareHeader(sound, &wavebuf[i],
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288 sizeof(wavebuf[i]));
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289 if ( result != MMSYSERR_NOERROR ) {
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290 SetMMerror("waveOutPrepareHeader()", result);
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291 return(-1);
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292 }
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293 }
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294
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295 /* Ready to go! */
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296 next_buffer = 0;
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297 return(0);
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298 }
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