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annotate src/audio/windib/SDL_dibaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 84de7511f79f
children 4da1ee79c9af
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 #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 #define WIN32_LEAN_AND_MEAN
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27 #include <windows.h>
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28 #include <mmsystem.h>
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29
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30 #include "SDL_timer.h"
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31 #include "SDL_audio.h"
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32 #include "../SDL_audio_c.h"
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33 #include "SDL_dibaudio.h"
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34 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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35 #include "win_ce_semaphore.h"
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36 #endif
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37
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38
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39 /* Audio driver functions */
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40 static int DIB_OpenAudio (_THIS, SDL_AudioSpec * spec);
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41 static void DIB_ThreadInit (_THIS);
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42 static void DIB_WaitAudio (_THIS);
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43 static Uint8 *DIB_GetAudioBuf (_THIS);
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44 static void DIB_PlayAudio (_THIS);
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45 static void DIB_WaitDone (_THIS);
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46 static void DIB_CloseAudio (_THIS);
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47
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48 /* Audio driver bootstrap functions */
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49
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50 static int
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51 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
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57 Audio_DeleteDevice (SDL_AudioDevice * device)
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58 {
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59 SDL_free (device->hidden);
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60 SDL_free (device);
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61 }
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62
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63 static SDL_AudioDevice *
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64 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 *) SDL_malloc (sizeof (SDL_AudioDevice));
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70 if (this) {
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71 SDL_memset (this, 0, (sizeof *this));
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72 this->hidden = (struct SDL_PrivateAudioData *)
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73 SDL_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 SDL_free (this);
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79 }
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80 return (0);
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81 }
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82 SDL_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
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106 FillSound (HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
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107 DWORD dwParam1, DWORD dwParam2)
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108 {
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109 SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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110
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111 /* Only service "buffer done playing" messages */
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112 if (uMsg != WOM_DONE)
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113 return;
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114
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115 /* Signal that we are done playing a buffer */
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116 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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117 ReleaseSemaphoreCE (audio_sem, 1, NULL);
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118 #else
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119 ReleaseSemaphore (audio_sem, 1, NULL);
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120 #endif
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121 }
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122
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123 static void
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124 SetMMerror (char *function, MMRESULT code)
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125 {
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126 size_t len;
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127 char errbuf[MAXERRORLENGTH];
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128 #ifdef _WIN32_WCE
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129 wchar_t werrbuf[MAXERRORLENGTH];
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130 #endif
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131
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132 SDL_snprintf (errbuf, SDL_arraysize (errbuf), "%s: ", function);
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133 len = SDL_strlen (errbuf);
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134
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135 #ifdef _WIN32_WCE
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136 /* UNICODE version */
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137 waveOutGetErrorText (code, werrbuf, MAXERRORLENGTH - len);
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138 WideCharToMultiByte (CP_ACP, 0, werrbuf, -1, errbuf + len,
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139 MAXERRORLENGTH - len, NULL, NULL);
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140 #else
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141 waveOutGetErrorText (code, errbuf + len, (UINT) (MAXERRORLENGTH - len));
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142 #endif
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143
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144 SDL_SetError ("%s", errbuf);
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145 }
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146
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147 /* Set high priority for the audio thread */
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148 static void
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149 DIB_ThreadInit (_THIS)
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150 {
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151 SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_HIGHEST);
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152 }
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153
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154 void
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155 DIB_WaitAudio (_THIS)
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156 {
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157 /* Wait for an audio chunk to finish */
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158 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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159 WaitForSemaphoreCE (audio_sem, INFINITE);
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160 #else
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161 WaitForSingleObject (audio_sem, INFINITE);
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162 #endif
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163 }
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164
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165 Uint8 *
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166 DIB_GetAudioBuf (_THIS)
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167 {
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168 Uint8 *retval;
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169
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170 retval = (Uint8 *) (wavebuf[next_buffer].lpData);
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171 return retval;
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172 }
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173
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174 void
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175 DIB_PlayAudio (_THIS)
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176 {
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177 /* Queue it up */
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178 waveOutWrite (sound, &wavebuf[next_buffer], sizeof (wavebuf[0]));
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179 next_buffer = (next_buffer + 1) % NUM_BUFFERS;
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180 }
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181
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182 void
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183 DIB_WaitDone (_THIS)
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184 {
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185 int i, left;
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186
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187 do {
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188 left = NUM_BUFFERS;
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189 for (i = 0; i < NUM_BUFFERS; ++i) {
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190 if (wavebuf[i].dwFlags & WHDR_DONE) {
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191 --left;
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192 }
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193 }
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194 if (left > 0) {
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195 SDL_Delay (100);
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196 }
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197 }
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198 while (left > 0);
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199 }
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200
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201 void
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202 DIB_CloseAudio (_THIS)
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203 {
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204 int i;
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205
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206 /* Close up audio */
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207 if (audio_sem) {
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208 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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209 CloseSynchHandle (audio_sem);
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210 #else
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211 CloseHandle (audio_sem);
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212 #endif
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213 }
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214 if (sound) {
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215 waveOutClose (sound);
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216 }
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217
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218 /* Clean up mixing buffers */
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219 for (i = 0; i < NUM_BUFFERS; ++i) {
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220 if (wavebuf[i].dwUser != 0xFFFF) {
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221 waveOutUnprepareHeader (sound, &wavebuf[i], sizeof (wavebuf[i]));
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222 wavebuf[i].dwUser = 0xFFFF;
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223 }
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224 }
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225 /* Free raw mixing buffer */
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226 if (mixbuf != NULL) {
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227 SDL_free (mixbuf);
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228 mixbuf = NULL;
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229 }
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230 }
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231
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232 int
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233 DIB_OpenAudio (_THIS, SDL_AudioSpec * spec)
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234 {
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235 MMRESULT result;
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236 int i;
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237 WAVEFORMATEX waveformat;
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238
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239 /* Initialize the wavebuf structures for closing */
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240 sound = NULL;
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241 audio_sem = NULL;
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242 for (i = 0; i < NUM_BUFFERS; ++i)
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243 wavebuf[i].dwUser = 0xFFFF;
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244 mixbuf = NULL;
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245
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246 /* Set basic WAVE format parameters */
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247 SDL_memset (&waveformat, 0, sizeof (waveformat));
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248 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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249
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250 /* Determine the audio parameters from the AudioSpec */
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251 switch (spec->format & 0xFF) {
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252 case 8:
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253 /* Unsigned 8 bit audio data */
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254 spec->format = AUDIO_U8;
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255 waveformat.wBitsPerSample = 8;
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256 break;
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257 case 16:
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258 /* Signed 16 bit audio data */
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259 spec->format = AUDIO_S16;
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260 waveformat.wBitsPerSample = 16;
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261 break;
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262 default:
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263 SDL_SetError ("Unsupported audio format");
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264 return (-1);
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265 }
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266 waveformat.nChannels = spec->channels;
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267 waveformat.nSamplesPerSec = spec->freq;
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268 waveformat.nBlockAlign =
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269 waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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270 waveformat.nAvgBytesPerSec =
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271 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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272
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273 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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274 if (spec->samples < (spec->freq / 4))
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275 spec->samples = ((spec->freq / 4) + 3) & ~3;
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276
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277 /* Update the fragment size as size in bytes */
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278 SDL_CalculateAudioSpec (spec);
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279
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280 /* Open the audio device */
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281 result = waveOutOpen (&sound, WAVE_MAPPER, &waveformat,
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282 (DWORD_PTR) FillSound, (DWORD_PTR) this,
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283 CALLBACK_FUNCTION);
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284 if (result != MMSYSERR_NOERROR) {
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285 SetMMerror ("waveOutOpen()", result);
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286 return (-1);
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287 }
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288 #ifdef SOUND_DEBUG
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289 /* Check the sound device we retrieved */
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290 {
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291 WAVEOUTCAPS caps;
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292
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293 result = waveOutGetDevCaps ((UINT) sound, &caps, sizeof (caps));
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294 if (result != MMSYSERR_NOERROR) {
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295 SetMMerror ("waveOutGetDevCaps()", result);
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296 return (-1);
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297 }
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298 printf ("Audio device: %s\n", caps.szPname);
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299 }
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300 #endif
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301
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302 /* Create the audio buffer semaphore */
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303 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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304 audio_sem = CreateSemaphoreCE (NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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305 #else
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306 audio_sem = CreateSemaphore (NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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307 #endif
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308 if (audio_sem == NULL) {
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309 SDL_SetError ("Couldn't create semaphore");
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310 return (-1);
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311 }
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312
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313 /* Create the sound buffers */
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314 mixbuf = (Uint8 *) SDL_malloc (NUM_BUFFERS * spec->size);
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315 if (mixbuf == NULL) {
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316 SDL_SetError ("Out of memory");
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317 return (-1);
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318 }
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319 for (i = 0; i < NUM_BUFFERS; ++i) {
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320 SDL_memset (&wavebuf[i], 0, sizeof (wavebuf[i]));
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321 wavebuf[i].lpData = (LPSTR) & mixbuf[i * spec->size];
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322 wavebuf[i].dwBufferLength = spec->size;
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323 wavebuf[i].dwFlags = WHDR_DONE;
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324 result = waveOutPrepareHeader (sound, &wavebuf[i],
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325 sizeof (wavebuf[i]));
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326 if (result != MMSYSERR_NOERROR) {
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327 SetMMerror ("waveOutPrepareHeader()", result);
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328 return (-1);
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329 }
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330 }
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331
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332 /* Ready to go! */
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333 next_buffer = 0;
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334 return (0);
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335 }
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336
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337 /* vi: set ts=4 sw=4 expandtab: */