Mercurial > sdl-ios-xcode

annotate src/audio/windib/SDL_dibaudio.c @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 99210400e8b9
children 8f4ed5ec2b06
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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->
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111 wavebuf[this->hidden->next_buffer].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 } 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 =
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290 (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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291 if (this->hidden->mixbuf == NULL) {
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292 WINWAVEOUT_CloseDevice(this);
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293 SDL_OutOfMemory();
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294 return 0;
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295 }
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296 for (i = 0; i < NUM_BUFFERS; ++i) {
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297 SDL_memset(&this->hidden->wavebuf[i], '\0',
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298 sizeof(this->hidden->wavebuf[i]));
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299 this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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300 this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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301 this->hidden->wavebuf[i].lpData =
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302 (LPSTR) & this->hidden->mixbuf[i * this->spec.size];
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303 result = waveOutPrepareHeader(this->hidden->sound,
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304 &this->hidden->wavebuf[i],
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305 sizeof(this->hidden->wavebuf[i]));
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306 if (result != MMSYSERR_NOERROR) {
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307 WINWAVEOUT_CloseDevice(this);
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308 SetMMerror("waveOutPrepareHeader()", result);
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309 return 0;
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310 }
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311 }
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312
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313 return 1; /* Ready to go! */
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314 }
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315
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316
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317 static int
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318 WINWAVEOUT_Init(SDL_AudioDriverImpl * impl)
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319 {
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320 /* Set the function pointers */
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321 impl->OpenDevice = WINWAVEOUT_OpenDevice;
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322 impl->ThreadInit = WINWAVEOUT_ThreadInit;
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323 impl->PlayDevice = WINWAVEOUT_PlayDevice;
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324 impl->WaitDevice = WINWAVEOUT_WaitDevice;
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325 impl->WaitDone = WINWAVEOUT_WaitDone;
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326 impl->GetDeviceBuf = WINWAVEOUT_GetDeviceBuf;
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327 impl->CloseDevice = WINWAVEOUT_CloseDevice;
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328 impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: Is this true? */
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329
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330 /* !!! FIXME: not right for device enum? */
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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: */