Mercurial > sdl-ios-xcode

annotate src/audio/windib/SDL_dibaudio.c @ 2364:e321b52dee8f gsoc2008_iphone

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These files contain the audio support for iPhone. They are based on the CoreAudio audio driver for Mac OS X. The principle difference is that the iPhone doesn't seem to have a concept of audio devices ... it just has special units for audio in and audio out. Also had to change some functions to versions which seem to only exist on iPhone and will apparently exist in Mac OS X 10.6(!) There is currently no audio recording support -- my iPod Touch doesn't have a microphone to test this with.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 18 Jul 2008 17:53:54 +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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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: */