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annotate src/audio/windib/SDL_dibaudio.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
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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 #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], sizeof(wavebuf[i]));
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325 if (result != MMSYSERR_NOERROR) {
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326 SetMMerror("waveOutPrepareHeader()", result);
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327 return (-1);
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328 }
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329 }
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330
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331 /* Ready to go! */
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332 next_buffer = 0;
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333 return (0);
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334 }
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335
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336 /* vi: set ts=4 sw=4 expandtab: */