Mercurial > sdl-ios-xcode

annotate src/audio/windib/SDL_dibaudio.c @ 2442:ce6623e28015 gsoc2008_iphone

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renamed and moved up one directory
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 23:51:11 +0000
parents 866052b01ee5
children e27bdcc80744 204be4fc2726
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #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 #if defined(_WIN32_WCE)
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39 #define WINDOWS_OS_NAME "Windows CE/PocketPC"
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40 #elif defined(WIN64)
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41 #define WINDOWS_OS_NAME "Win64"
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42 #else
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43 #define WINDOWS_OS_NAME "Win32"
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44 #endif
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45
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46 /* The Win32 callback for filling the WAVE device */
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47 static void CALLBACK
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48 FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
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49 DWORD dwParam1, DWORD dwParam2)
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50 {
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51 SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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52
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53 /* Only service "buffer done playing" messages */
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54 if (uMsg != WOM_DONE)
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55 return;
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56
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57 /* Signal that we are done playing a buffer */
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58 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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59 ReleaseSemaphoreCE(this->hidden->audio_sem, 1, NULL);
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60 #else
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61 ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
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62 #endif
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63 }
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64
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65 static void
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66 SetMMerror(char *function, MMRESULT code)
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67 {
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68 size_t len;
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69 char errbuf[MAXERRORLENGTH];
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70 #ifdef _WIN32_WCE
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71 wchar_t werrbuf[MAXERRORLENGTH];
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72 #endif
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73
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74 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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75 len = SDL_strlen(errbuf);
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76
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77 #ifdef _WIN32_WCE
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78 /* UNICODE version */
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79 waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH - len);
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80 WideCharToMultiByte(CP_ACP, 0, werrbuf, -1, errbuf + len,
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81 MAXERRORLENGTH - len, NULL, NULL);
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82 #else
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83 waveOutGetErrorText(code, errbuf + len, (UINT) (MAXERRORLENGTH - len));
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84 #endif
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85
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86 SDL_SetError("%s", errbuf);
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87 }
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88
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89 /* Set high priority for the audio thread */
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90 static void
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91 WINWAVEOUT_ThreadInit(_THIS)
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92 {
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93 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
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94 }
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95
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96 void
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97 WINWAVEOUT_WaitDevice(_THIS)
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98 {
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99 /* Wait for an audio chunk to finish */
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100 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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101 WaitForSemaphoreCE(this->hidden->audio_sem, INFINITE);
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102 #else
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103 WaitForSingleObject(this->hidden->audio_sem, INFINITE);
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104 #endif
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105 }
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106
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107 Uint8 *
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108 WINWAVEOUT_GetDeviceBuf(_THIS)
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109 {
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110 return (Uint8 *) (this->hidden->wavebuf[this->hidden->next_buffer].
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111 lpData);
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112 }
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113
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114 void
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115 WINWAVEOUT_PlayDevice(_THIS)
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116 {
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117 /* Queue it up */
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118 waveOutWrite(this->hidden->sound,
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119 &this->hidden->wavebuf[this->hidden->next_buffer],
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120 sizeof(this->hidden->wavebuf[0]));
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121 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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122 }
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123
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124 void
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125 WINWAVEOUT_WaitDone(_THIS)
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126 {
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127 int i, left;
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128
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129 do {
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130 left = NUM_BUFFERS;
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131 for (i = 0; i < NUM_BUFFERS; ++i) {
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132 if (this->hidden->wavebuf[i].dwFlags & WHDR_DONE) {
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133 --left;
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134 }
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135 }
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136 if (left > 0) {
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137 SDL_Delay(100);
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138 }
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139 }
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140 while (left > 0);
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141 }
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142
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143 void
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144 WINWAVEOUT_CloseDevice(_THIS)
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145 {
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146 /* Close up audio */
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147 if (this->hidden != NULL) {
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148 int i;
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149
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150 if (this->hidden->audio_sem) {
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151 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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152 CloseSynchHandle(this->hidden->audio_sem);
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153 #else
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154 CloseHandle(this->hidden->audio_sem);
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155 #endif
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156 this->hidden->audio_sem = 0;
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157 }
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158
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159 if (this->hidden->sound) {
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160 waveOutClose(this->hidden->sound);
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161 this->hidden->sound = 0;
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162 }
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163
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164 /* Clean up mixing buffers */
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165 for (i = 0; i < NUM_BUFFERS; ++i) {
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166 if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
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167 waveOutUnprepareHeader(this->hidden->sound,
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168 &this->hidden->wavebuf[i],
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169 sizeof(this->hidden->wavebuf[i]));
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170 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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171 }
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172 }
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173
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174 if (this->hidden->mixbuf != NULL) {
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175 /* Free raw mixing buffer */
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176 SDL_free(this->hidden->mixbuf);
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177 this->hidden->mixbuf = NULL;
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178 }
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179
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180 SDL_free(this->hidden);
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181 this->hidden = NULL;
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182 }
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183 }
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184
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185 int
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186 WINWAVEOUT_OpenDevice(_THIS, const char *devname, int iscapture)
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187 {
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188 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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189 int valid_datatype = 0;
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190 MMRESULT result;
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191 WAVEFORMATEX waveformat;
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192 int i;
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193
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194 /* Initialize all variables that we clean on shutdown */
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195 this->hidden = (struct SDL_PrivateAudioData *)
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196 SDL_malloc((sizeof *this->hidden));
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197 if (this->hidden == NULL) {
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198 SDL_OutOfMemory();
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199 return 0;
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200 }
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201 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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202
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203 /* Initialize the wavebuf structures for closing */
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204 for (i = 0; i < NUM_BUFFERS; ++i)
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205 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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206
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207 while ((!valid_datatype) && (test_format)) {
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208 valid_datatype = 1;
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209 this->spec.format = test_format;
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210 switch (test_format) {
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211 case AUDIO_U8:
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212 case AUDIO_S16:
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213 case AUDIO_S32:
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214 break; /* valid. */
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215
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216 default:
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217 valid_datatype = 0;
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218 test_format = SDL_NextAudioFormat();
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219 break;
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220 }
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221 }
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222
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223 if (!valid_datatype) {
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224 WINWAVEOUT_CloseDevice(this);
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225 SDL_SetError("Unsupported audio format");
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226 return 0;
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227 }
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228
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229 /* Set basic WAVE format parameters */
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230 SDL_memset(&waveformat, '\0', sizeof(waveformat));
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231 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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232 waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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233
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234 if (this->spec.channels > 2)
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235 this->spec.channels = 2; /* !!! FIXME: is this right? */
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236
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237 waveformat.nChannels = this->spec.channels;
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238 waveformat.nSamplesPerSec = this->spec.freq;
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239 waveformat.nBlockAlign =
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240 waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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241 waveformat.nAvgBytesPerSec =
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242 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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243
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244 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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245 if (this->spec.samples < (this->spec.freq / 4))
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246 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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247
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248 /* Update the fragment size as size in bytes */
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249 SDL_CalculateAudioSpec(&this->spec);
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250
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251 /* Open the audio device */
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252 result = waveOutOpen(&this->hidden->sound, WAVE_MAPPER, &waveformat,
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253 (DWORD_PTR) FillSound, (DWORD_PTR) this,
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254 CALLBACK_FUNCTION);
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255 if (result != MMSYSERR_NOERROR) {
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256 WINWAVEOUT_CloseDevice(this);
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257 SetMMerror("waveOutOpen()", result);
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258 return 0;
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259 }
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260 #ifdef SOUND_DEBUG
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261 /* Check the sound device we retrieved */
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262 {
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263 WAVEOUTCAPS caps;
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264
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265 result = waveOutGetDevCaps((UINT) this->hidden->sound,
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266 &caps, sizeof(caps));
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267 if (result != MMSYSERR_NOERROR) {
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268 WINWAVEOUT_CloseDevice(this);
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269 SetMMerror("waveOutGetDevCaps()", result);
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270 return 0;
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271 }
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272 printf("Audio device: %s\n", caps.szPname);
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273 }
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274 #endif
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275
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276 /* Create the audio buffer semaphore */
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277 this->hidden->audio_sem =
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278 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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279 CreateSemaphoreCE(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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280 #else
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281 CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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282 #endif
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283 if (this->hidden->audio_sem == NULL) {
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284 WINWAVEOUT_CloseDevice(this);
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285 SDL_SetError("Couldn't create semaphore");
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286 return 0;
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287 }
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288
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289 /* Create the sound buffers */
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290 this->hidden->mixbuf =
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291 (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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292 if (this->hidden->mixbuf == NULL) {
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293 WINWAVEOUT_CloseDevice(this);
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294 SDL_OutOfMemory();
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295 return 0;
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296 }
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297 for (i = 0; i < NUM_BUFFERS; ++i) {
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298 SDL_memset(&this->hidden->wavebuf[i], '\0',
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299 sizeof(this->hidden->wavebuf[i]));
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300 this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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301 this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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302 this->hidden->wavebuf[i].lpData =
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303 (LPSTR) & this->hidden->mixbuf[i * this->spec.size];
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304 result = waveOutPrepareHeader(this->hidden->sound,
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305 &this->hidden->wavebuf[i],
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306 sizeof(this->hidden->wavebuf[i]));
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307 if (result != MMSYSERR_NOERROR) {
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308 WINWAVEOUT_CloseDevice(this);
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309 SetMMerror("waveOutPrepareHeader()", result);
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310 return 0;
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311 }
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312 }
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313
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314 return 1; /* Ready to go! */
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315 }
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316
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317
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318 static int
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319 WINWAVEOUT_Init(SDL_AudioDriverImpl * impl)
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320 {
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321 /* Set the function pointers */
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322 impl->OpenDevice = WINWAVEOUT_OpenDevice;
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323 impl->ThreadInit = WINWAVEOUT_ThreadInit;
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324 impl->PlayDevice = WINWAVEOUT_PlayDevice;
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325 impl->WaitDevice = WINWAVEOUT_WaitDevice;
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326 impl->WaitDone = WINWAVEOUT_WaitDone;
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327 impl->GetDeviceBuf = WINWAVEOUT_GetDeviceBuf;
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328 impl->CloseDevice = WINWAVEOUT_CloseDevice;
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329 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Is this true? */
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330
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331 return 1;
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332 }
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333
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334 AudioBootStrap WINWAVEOUT_bootstrap = {
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335 "waveout", WINDOWS_OS_NAME " WaveOut", WINWAVEOUT_Init, 0
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336 };
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337
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338 /* vi: set ts=4 sw=4 expandtab: */