annotate src/audio/windib/SDL_dibaudio.c @ 5157:fb424691cfc7

Moved the rendering code out to a separate directory in the hope that it can someday be completely decoupled from the rest of the library and be expanded to an awesome 2D on 3D library.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 02 Feb 2011 14:34:54 -0800
parents 327f181542f1
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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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327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share.
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26 #include "../../core/windows/SDL_windows.h"
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27 #include <mmsystem.h>
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_audio.h"
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31 #include "../SDL_audio_c.h"
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32 #include "SDL_dibaudio.h"
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33 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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34 #include "win_ce_semaphore.h"
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35 #endif
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36
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37 #if defined(_WIN32_WCE)
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38 #define WINDOWS_OS_NAME "Windows CE/PocketPC"
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39 #elif defined(WIN64)
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40 #define WINDOWS_OS_NAME "Win64"
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41 #else
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42 #define WINDOWS_OS_NAME "Win32"
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43 #endif
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44
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45 /* The Win32 callback for filling the WAVE device */
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46 static void CALLBACK
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47 FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
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48 DWORD dwParam1, DWORD dwParam2)
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49 {
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50 SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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51
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52 /* Only service "buffer done playing" messages */
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53 if (uMsg != WOM_DONE)
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54 return;
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55
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56 /* Signal that we are done playing a buffer */
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57 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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58 ReleaseSemaphoreCE(this->hidden->audio_sem, 1, NULL);
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59 #else
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60 ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
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61 #endif
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62 }
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63
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64 static void
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65 SetMMerror(char *function, MMRESULT code)
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66 {
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67 size_t len;
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68 char errbuf[MAXERRORLENGTH];
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69 wchar_t werrbuf[MAXERRORLENGTH];
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70
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71 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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72 len = SDL_strlen(errbuf);
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73
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74 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH - len);
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75 WideCharToMultiByte(CP_ACP, 0, werrbuf, -1, errbuf + len,
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76 MAXERRORLENGTH - len, NULL, NULL);
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77
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78 SDL_SetError("%s", errbuf);
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79 }
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80
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81 /* Set high priority for the audio thread */
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82 static void
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83 WINWAVEOUT_ThreadInit(_THIS)
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84 {
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85 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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86 }
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87
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88 void
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89 WINWAVEOUT_WaitDevice(_THIS)
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90 {
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91 /* Wait for an audio chunk to finish */
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92 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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93 WaitForSemaphoreCE(this->hidden->audio_sem, INFINITE);
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94 #else
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95 WaitForSingleObject(this->hidden->audio_sem, INFINITE);
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96 #endif
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97 }
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98
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99 Uint8 *
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100 WINWAVEOUT_GetDeviceBuf(_THIS)
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101 {
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102 return (Uint8 *) (this->hidden->
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103 wavebuf[this->hidden->next_buffer].lpData);
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104 }
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105
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106 void
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107 WINWAVEOUT_PlayDevice(_THIS)
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108 {
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109 /* Queue it up */
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110 waveOutWrite(this->hidden->sound,
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111 &this->hidden->wavebuf[this->hidden->next_buffer],
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112 sizeof(this->hidden->wavebuf[0]));
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113 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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114 }
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115
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116 void
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117 WINWAVEOUT_WaitDone(_THIS)
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118 {
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119 int i, left;
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120
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121 do {
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122 left = NUM_BUFFERS;
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123 for (i = 0; i < NUM_BUFFERS; ++i) {
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124 if (this->hidden->wavebuf[i].dwFlags & WHDR_DONE) {
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125 --left;
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126 }
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127 }
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128 if (left > 0) {
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129 SDL_Delay(100);
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130 }
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131 } while (left > 0);
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132 }
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133
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134 void
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135 WINWAVEOUT_CloseDevice(_THIS)
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136 {
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137 /* Close up audio */
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138 if (this->hidden != NULL) {
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139 int i;
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140
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141 if (this->hidden->audio_sem) {
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142 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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143 CloseSynchHandle(this->hidden->audio_sem);
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144 #else
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145 CloseHandle(this->hidden->audio_sem);
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146 #endif
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147 this->hidden->audio_sem = 0;
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148 }
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149
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150 if (this->hidden->sound) {
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151 waveOutClose(this->hidden->sound);
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152 this->hidden->sound = 0;
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153 }
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154
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155 /* Clean up mixing buffers */
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156 for (i = 0; i < NUM_BUFFERS; ++i) {
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157 if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
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158 waveOutUnprepareHeader(this->hidden->sound,
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159 &this->hidden->wavebuf[i],
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160 sizeof(this->hidden->wavebuf[i]));
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161 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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162 }
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163 }
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164
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165 if (this->hidden->mixbuf != NULL) {
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166 /* Free raw mixing buffer */
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167 SDL_free(this->hidden->mixbuf);
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168 this->hidden->mixbuf = NULL;
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169 }
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170
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171 SDL_free(this->hidden);
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172 this->hidden = NULL;
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173 }
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174 }
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175
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176 int
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177 WINWAVEOUT_OpenDevice(_THIS, const char *devname, int iscapture)
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178 {
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179 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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180 int valid_datatype = 0;
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181 MMRESULT result;
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182 WAVEFORMATEX waveformat;
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183 int i;
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184
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185 /* Initialize all variables that we clean on shutdown */
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186 this->hidden = (struct SDL_PrivateAudioData *)
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187 SDL_malloc((sizeof *this->hidden));
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188 if (this->hidden == NULL) {
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189 SDL_OutOfMemory();
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190 return 0;
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191 }
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192 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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193
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194 /* Initialize the wavebuf structures for closing */
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195 for (i = 0; i < NUM_BUFFERS; ++i)
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196 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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197
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198 while ((!valid_datatype) && (test_format)) {
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199 valid_datatype = 1;
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200 this->spec.format = test_format;
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201 switch (test_format) {
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202 case AUDIO_U8:
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203 case AUDIO_S16:
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204 case AUDIO_S32:
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205 break; /* valid. */
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206
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207 default:
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208 valid_datatype = 0;
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209 test_format = SDL_NextAudioFormat();
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210 break;
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211 }
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212 }
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213
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214 if (!valid_datatype) {
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215 WINWAVEOUT_CloseDevice(this);
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216 SDL_SetError("Unsupported audio format");
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217 return 0;
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218 }
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219
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220 /* Set basic WAVE format parameters */
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221 SDL_memset(&waveformat, '\0', sizeof(waveformat));
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222 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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223 waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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224
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225 if (this->spec.channels > 2)
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226 this->spec.channels = 2; /* !!! FIXME: is this right? */
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227
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228 waveformat.nChannels = this->spec.channels;
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229 waveformat.nSamplesPerSec = this->spec.freq;
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230 waveformat.nBlockAlign =
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231 waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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232 waveformat.nAvgBytesPerSec =
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233 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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234
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235 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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236 if (this->spec.samples < (this->spec.freq / 4))
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237 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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238
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239 /* Update the fragment size as size in bytes */
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240 SDL_CalculateAudioSpec(&this->spec);
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241
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242 /* Open the audio device */
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243 result = waveOutOpen(&this->hidden->sound, WAVE_MAPPER, &waveformat,
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244 (DWORD_PTR) FillSound, (DWORD_PTR) this,
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245 CALLBACK_FUNCTION);
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246 if (result != MMSYSERR_NOERROR) {
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247 WINWAVEOUT_CloseDevice(this);
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248 SetMMerror("waveOutOpen()", result);
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249 return 0;
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250 }
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251 #ifdef SOUND_DEBUG
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252 /* Check the sound device we retrieved */
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253 {
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254 WAVEOUTCAPS caps;
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255
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256 result = waveOutGetDevCaps((UINT) this->hidden->sound,
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257 &caps, sizeof(caps));
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258 if (result != MMSYSERR_NOERROR) {
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259 WINWAVEOUT_CloseDevice(this);
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260 SetMMerror("waveOutGetDevCaps()", result);
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261 return 0;
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262 }
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263 printf("Audio device: %s\n", caps.szPname);
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264 }
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265 #endif
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266
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267 /* Create the audio buffer semaphore */
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268 this->hidden->audio_sem =
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269 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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270 CreateSemaphoreCE(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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271 #else
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272 CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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273 #endif
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274 if (this->hidden->audio_sem == NULL) {
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275 WINWAVEOUT_CloseDevice(this);
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276 SDL_SetError("Couldn't create semaphore");
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277 return 0;
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278 }
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279
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280 /* Create the sound buffers */
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281 this->hidden->mixbuf =
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282 (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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283 if (this->hidden->mixbuf == NULL) {
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284 WINWAVEOUT_CloseDevice(this);
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285 SDL_OutOfMemory();
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286 return 0;
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287 }
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288 for (i = 0; i < NUM_BUFFERS; ++i) {
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289 SDL_memset(&this->hidden->wavebuf[i], '\0',
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290 sizeof(this->hidden->wavebuf[i]));
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291 this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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292 this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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293 this->hidden->wavebuf[i].lpData =
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294 (LPSTR) & this->hidden->mixbuf[i * this->spec.size];
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295 result = waveOutPrepareHeader(this->hidden->sound,
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296 &this->hidden->wavebuf[i],
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297 sizeof(this->hidden->wavebuf[i]));
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298 if (result != MMSYSERR_NOERROR) {
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299 WINWAVEOUT_CloseDevice(this);
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300 SetMMerror("waveOutPrepareHeader()", result);
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301 return 0;
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302 }
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303 }
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304
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305 return 1; /* Ready to go! */
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306 }
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307
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308
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309 static int
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310 WINWAVEOUT_Init(SDL_AudioDriverImpl * impl)
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311 {
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312 /* Set the function pointers */
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313 impl->OpenDevice = WINWAVEOUT_OpenDevice;
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314 impl->ThreadInit = WINWAVEOUT_ThreadInit;
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315 impl->PlayDevice = WINWAVEOUT_PlayDevice;
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316 impl->WaitDevice = WINWAVEOUT_WaitDevice;
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317 impl->WaitDone = WINWAVEOUT_WaitDone;
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318 impl->GetDeviceBuf = WINWAVEOUT_GetDeviceBuf;
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319 impl->CloseDevice = WINWAVEOUT_CloseDevice;
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320 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Is this true? */
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321
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322 return 1; /* this audio target is available. */
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323 }
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324
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325 AudioBootStrap WINWAVEOUT_bootstrap = {
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326 "waveout", WINDOWS_OS_NAME " WaveOut", WINWAVEOUT_Init, 0
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327 };
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328
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329 /* vi: set ts=4 sw=4 expandtab: */