annotate src/audio/windib/SDL_dibaudio.c @ 2049:5f6550e5184f

Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:15:21 +0000
parents a5d0758f88d8
children bbc89e09503f
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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 #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].lpData);
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111 }
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112
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113 void
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114 WINWAVEOUT_PlayDevice(_THIS)
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115 {
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116 /* Queue it up */
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117 waveOutWrite(this->hidden->sound,
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118 &this->hidden->wavebuf[this->hidden->next_buffer],
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119 sizeof (this->hidden->wavebuf[0]));
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120 this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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121 }
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122
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123 void
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124 WINWAVEOUT_WaitDone(_THIS)
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125 {
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126 int i, left;
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127
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128 do {
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129 left = NUM_BUFFERS;
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130 for (i = 0; i < NUM_BUFFERS; ++i) {
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131 if (this->hidden->wavebuf[i].dwFlags & WHDR_DONE) {
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132 --left;
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133 }
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134 }
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135 if (left > 0) {
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136 SDL_Delay(100);
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137 }
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138 }
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139 while (left > 0);
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140 }
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141
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142 void
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143 WINWAVEOUT_CloseDevice(_THIS)
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144 {
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145 /* Close up audio */
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146 if (this->hidden != NULL) {
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147 int i;
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148
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149 if (this->hidden->audio_sem) {
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150 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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151 CloseSynchHandle(this->hidden->audio_sem);
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152 #else
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153 CloseHandle(this->hidden->audio_sem);
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154 #endif
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155 this->hidden->audio_sem = 0;
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156 }
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157
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158 if (this->hidden->sound) {
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159 waveOutClose(this->hidden->sound);
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160 this->hidden->sound = 0;
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161 }
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162
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163 /* Clean up mixing buffers */
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164 for (i = 0; i < NUM_BUFFERS; ++i) {
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165 if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
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166 waveOutUnprepareHeader(this->hidden->sound,
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167 &this->hidden->wavebuf[i],
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168 sizeof (this->hidden->wavebuf[i]));
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169 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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170 }
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171 }
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172
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173 if (this->hidden->mixbuf != NULL) {
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174 /* Free raw mixing buffer */
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175 SDL_free(this->hidden->mixbuf);
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176 this->hidden->mixbuf = NULL;
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177 }
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178
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179 SDL_free(this->hidden);
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180 this->hidden = NULL;
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181 }
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182 }
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183
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184 int
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185 WINWAVEOUT_OpenDevice(_THIS, const char *devname, int iscapture)
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186 {
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187 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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188 int valid_datatype = 0;
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189 MMRESULT result;
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190 WAVEFORMATEX waveformat;
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191 int i;
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192
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193 /* Initialize all variables that we clean on shutdown */
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194 this->hidden = (struct SDL_PrivateAudioData *)
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195 SDL_malloc((sizeof *this->hidden));
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196 if (this->hidden == NULL) {
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197 SDL_OutOfMemory();
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198 return 0;
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199 }
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200 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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201
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202 /* Initialize the wavebuf structures for closing */
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203 for (i = 0; i < NUM_BUFFERS; ++i)
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204 this->hidden->wavebuf[i].dwUser = 0xFFFF;
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205
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206 while ((!valid_datatype) && (test_format)) {
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207 valid_datatype = 1;
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208 _this->spec.format = test_format;
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209 switch (test_format) {
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210 case AUDIO_U8:
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211 case AUDIO_S16:
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212 case AUDIO_S32:
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213 break; /* valid. */
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214
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215 default:
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216 valid_datatype = 0;
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217 test_format = SDL_NextAudioFormat();
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218 break;
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219 }
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220 }
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221
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222 if (!valid_datatype) {
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223 WINWAVEOUT_CloseDevice(this);
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224 SDL_SetError("Unsupported audio format");
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225 return 0;
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226 }
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227
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228 /* Set basic WAVE format parameters */
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229 SDL_memset(&waveformat, '\0', sizeof (waveformat));
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230 waveformat.wFormatTag = WAVE_FORMAT_PCM;
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231 waveformat.wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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232
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233 if (this->spec.channels > 2)
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234 this->spec.channels = 2; /* !!! FIXME: is this right? */
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235
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236 waveformat.nChannels = this->spec.channels;
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237 waveformat.nSamplesPerSec = this->spec.freq;
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238 waveformat.nBlockAlign =
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239 waveformat.nChannels * (waveformat.wBitsPerSample / 8);
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240 waveformat.nAvgBytesPerSec =
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241 waveformat.nSamplesPerSec * waveformat.nBlockAlign;
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242
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243 /* Check the buffer size -- minimum of 1/4 second (word aligned) */
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244 if (this->spec.samples < (this->spec.freq / 4))
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245 this->spec.samples = ((this->spec.freq / 4) + 3) & ~3;
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246
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247 /* Update the fragment size as size in bytes */
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248 SDL_CalculateAudioSpec(&this->spec);
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249
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250 /* Open the audio device */
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251 result = waveOutOpen(&this->hidden->sound, WAVE_MAPPER, &waveformat,
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252 (DWORD_PTR) FillSound, (DWORD_PTR) this,
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253 CALLBACK_FUNCTION);
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254 if (result != MMSYSERR_NOERROR) {
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255 WINWAVEOUT_CloseDevice(this);
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256 SetMMerror("waveOutOpen()", result);
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257 return 0;
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258 }
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259 #ifdef SOUND_DEBUG
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260 /* Check the sound device we retrieved */
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261 {
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262 WAVEOUTCAPS caps;
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263
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264 result = waveOutGetDevCaps((UINT) this->hidden->sound,
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265 &caps, sizeof(caps));
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266 if (result != MMSYSERR_NOERROR) {
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267 WINWAVEOUT_CloseDevice(this);
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268 SetMMerror("waveOutGetDevCaps()", result);
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269 return 0;
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270 }
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271 printf("Audio device: %s\n", caps.szPname);
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272 }
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273 #endif
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274
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275 /* Create the audio buffer semaphore */
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276 this->hidden->audio_sem =
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277 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
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278 CreateSemaphoreCE(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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279 #else
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280 CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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281 #endif
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282 if (this->hidden->audio_sem == NULL) {
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283 WINWAVEOUT_CloseDevice(this);
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284 SDL_SetError("Couldn't create semaphore");
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285 return 0;
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286 }
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287
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288 /* Create the sound buffers */
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289 this->hidden->mixbuf = (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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290 if (mixbuf == NULL) {
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291 WINWAVEOUT_CloseDevice(this);
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292 SDL_OutOfMemory();
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293 return 0;
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294 }
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295 for (i = 0; i < NUM_BUFFERS; ++i) {
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296 SDL_memset(&this->hidden->wavebuf[i], '\0',
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297 sizeof (this->hidden->wavebuf[i]));
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298 this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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299 this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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300 this->hidden->wavebuf[i].lpData =
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301 (LPSTR) &this->hidden->mixbuf[i * this->spec.size];
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302 result = waveOutPrepareHeader(this->hidden->sound,
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303 &this->hidden->wavebuf[i],
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304 sizeof (this->hidden->wavebuf[i]));
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305 if (result != MMSYSERR_NOERROR) {
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306 WINWAVEOUT_CloseDevice(this);
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307 SetMMerror("waveOutPrepareHeader()", result);
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308 return 0;
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309 }
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310 }
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311
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312 return 1; /* Ready to go! */
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313 }
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314
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315
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316 static int
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317 WINWAVEOUT_Init(SDL_AudioDriverImpl *impl)
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318 {
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319 /* Set the function pointers */
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320 impl->OpenDevice = WINWAVEOUT_OpenDevice;
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321 impl->ThreadInit = WINWAVEOUT_ThreadInit;
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322 impl->PlayDevice = WINWAVEOUT_PlayDevice;
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323 impl->WaitDevice = WINWAVEOUT_WaitDevice;
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324 impl->WaitDone = WINWAVEOUT_WaitDone;
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325 impl->GetDeviceBuf = WINWAVEOUT_GetDeviceBuf;
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326 impl->CloseDevice = WINWAVEOUT_CloseDevice;
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327 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Is this true? */
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328
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329 return 1;
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330 }
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331
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332 AudioBootStrap WINWAVEOUT_bootstrap = {
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333 "waveout", WINDOWS_OS_NAME " WaveOut", WINWAVEOUT_Init, 0
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334 };
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335
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336 /* vi: set ts=4 sw=4 expandtab: */