Mercurial > sdl-ios-xcode
annotate src/audio/mme/SDL_mmeaudio.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device
Audio bootstraps can now specify that a driver is only to be used if
explicitly requested (for things like the "disk" driver that is always
available but you would never want to default to using).
Trimmed out code that can be handled by stubs in the core. The "dummy" driver
is pretty damned small now. :)
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Wed, 04 Oct 2006 21:27:53 +0000 |
parents | b3741f227757 |
children | 1806fd1acba4 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2004 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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 /* Tru64 UNIX MME support */ |
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25 #include <mme_api.h> |
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26 |
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More header massaging... works great on Windows. ;-)
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27 #include "SDL_timer.h" |
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28 #include "SDL_audio.h" |
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29 #include "../SDL_audio_c.h" |
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30 #include "SDL_mmeaudio.h" |
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31 |
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32 static BOOL inUse[NUM_BUFFERS]; |
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33 |
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34 /* Audio driver functions */ |
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35 static int MME_OpenAudio(_THIS, SDL_AudioSpec * spec); |
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36 static void MME_WaitAudio(_THIS); |
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37 static Uint8 *MME_GetAudioBuf(_THIS); |
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38 static void MME_PlayAudio(_THIS); |
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39 static void MME_WaitDone(_THIS); |
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40 static void MME_CloseAudio(_THIS); |
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41 |
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42 /* Audio driver bootstrap functions */ |
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43 static int |
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44 Audio_Available(void) |
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45 { |
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46 return (1); |
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47 } |
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48 |
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49 static void |
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50 Audio_DeleteDevice(SDL_AudioDevice * device) |
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51 { |
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52 if (device) { |
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53 if (device->hidden) { |
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54 SDL_free(device->hidden); |
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55 device->hidden = NULL; |
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56 } |
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57 SDL_free(device); |
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58 device = NULL; |
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59 } |
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60 } |
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61 |
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62 static SDL_AudioDevice * |
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63 Audio_CreateDevice(int devindex) |
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64 { |
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65 SDL_AudioDevice *this; |
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66 |
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67 /* Initialize all variables that we clean on shutdown */ |
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68 this = SDL_malloc(sizeof(SDL_AudioDevice)); |
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69 if (this) { |
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70 SDL_memset(this, 0, (sizeof *this)); |
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71 this->hidden = SDL_malloc((sizeof *this->hidden)); |
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72 } |
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73 if ((this == NULL) || (this->hidden == NULL)) { |
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74 SDL_OutOfMemory(); |
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75 if (this) { |
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76 SDL_free(this); |
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77 } |
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78 return (0); |
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79 } |
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80 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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81 /* Set the function pointers */ |
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82 this->OpenAudio = MME_OpenAudio; |
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83 this->WaitAudio = MME_WaitAudio; |
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84 this->PlayAudio = MME_PlayAudio; |
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85 this->GetAudioBuf = MME_GetAudioBuf; |
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86 this->WaitDone = MME_WaitDone; |
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87 this->CloseAudio = MME_CloseAudio; |
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88 this->free = Audio_DeleteDevice; |
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89 |
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90 return this; |
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91 } |
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92 |
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93 AudioBootStrap MMEAUDIO_bootstrap = { |
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94 "waveout", "Tru64 MME WaveOut", |
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95 Audio_Available, Audio_CreateDevice, 0 |
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96 }; |
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97 |
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98 static void |
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99 SetMMerror(char *function, MMRESULT code) |
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100 { |
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101 int len; |
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102 char errbuf[MAXERRORLENGTH]; |
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103 |
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104 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
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105 len = SDL_strlen(errbuf); |
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106 waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len); |
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107 SDL_SetError("%s", errbuf); |
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108 } |
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109 |
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110 static void CALLBACK |
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111 MME_CALLBACK(HWAVEOUT hwo, |
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112 UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2) |
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113 { |
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114 WAVEHDR *wp = (WAVEHDR *) dwParam1; |
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115 |
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116 if (uMsg == WOM_DONE) |
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117 inUse[wp->dwUser] = FALSE; |
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118 } |
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119 |
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120 static int |
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121 MME_OpenAudio(_THIS, SDL_AudioSpec * spec) |
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122 { |
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123 MMRESULT result; |
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124 int i; |
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125 |
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126 mixbuf = NULL; |
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127 |
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128 /* Set basic WAVE format parameters */ |
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129 shm = mmeAllocMem(sizeof(*shm)); |
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130 if (shm == NULL) { |
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131 SDL_SetError("Out of memory: shm"); |
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132 return (-1); |
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133 } |
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134 shm->sound = 0; |
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135 shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; |
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136 |
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137 /* Determine the audio parameters from the AudioSpec */ |
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138 switch (SDL_AUDIO_BITSIZE(spec->format)) { |
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139 case 8: |
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140 /* Unsigned 8 bit audio data */ |
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141 spec->format = AUDIO_U8; |
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142 shm->wFmt.wBitsPerSample = 8; |
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143 break; |
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144 case 16: |
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145 /* Signed 16 bit audio data */ |
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146 spec->format = AUDIO_S16; |
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147 shm->wFmt.wBitsPerSample = 16; |
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148 break; |
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149 case 32: |
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150 /* Signed 32 bit audio data */ |
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151 spec->format = AUDIO_S32; |
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152 shm->wFmt.wBitsPerSample = 32; |
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153 break; |
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154 default: |
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155 SDL_SetError("Unsupported audio format"); |
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156 return (-1); |
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157 } |
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158 |
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159 /* !!! FIXME: Can this handle more than stereo? */ |
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160 shm->wFmt.wf.nChannels = spec->channels; |
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161 shm->wFmt.wf.nSamplesPerSec = spec->freq; |
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162 shm->wFmt.wf.nBlockAlign = |
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163 shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8; |
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164 shm->wFmt.wf.nAvgBytesPerSec = |
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165 shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign; |
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166 |
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167 /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
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168 if (spec->samples < (spec->freq / 4)) |
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169 spec->samples = ((spec->freq / 4) + 3) & ~3; |
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170 |
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171 /* Update the fragment size as size in bytes */ |
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172 SDL_CalculateAudioSpec(spec); |
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173 |
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174 /* Open the audio device */ |
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175 result = waveOutOpen(&(shm->sound), |
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176 WAVE_MAPPER, |
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177 &(shm->wFmt.wf), |
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178 MME_CALLBACK, |
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179 NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE)); |
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180 if (result != MMSYSERR_NOERROR) { |
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181 SetMMerror("waveOutOpen()", result); |
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182 return (-1); |
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183 } |
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184 |
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185 /* Create the sound buffers */ |
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186 mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (spec->size)); |
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187 if (mixbuf == NULL) { |
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188 SDL_SetError("Out of memory: mixbuf"); |
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189 return (-1); |
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190 } |
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191 |
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192 for (i = 0; i < NUM_BUFFERS; i++) { |
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193 shm->wHdr[i].lpData = &mixbuf[i * (spec->size)]; |
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194 shm->wHdr[i].dwBufferLength = spec->size; |
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195 shm->wHdr[i].dwFlags = 0; |
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196 shm->wHdr[i].dwUser = i; |
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197 shm->wHdr[i].dwLoops = 0; /* loop control counter */ |
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198 shm->wHdr[i].lpNext = NULL; /* reserved for driver */ |
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199 shm->wHdr[i].reserved = 0; |
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200 inUse[i] = FALSE; |
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201 } |
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202 next_buffer = 0; |
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203 return 0; |
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204 } |
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205 |
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206 static void |
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207 MME_WaitAudio(_THIS) |
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208 { |
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209 while (inUse[next_buffer]) { |
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210 mmeWaitForCallbacks(); |
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211 mmeProcessCallbacks(); |
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212 } |
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213 } |
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214 |
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215 static Uint8 * |
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216 MME_GetAudioBuf(_THIS) |
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217 { |
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218 Uint8 *retval; |
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219 |
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220 inUse[next_buffer] = TRUE; |
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221 retval = (Uint8 *) (shm->wHdr[next_buffer].lpData); |
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222 return retval; |
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223 } |
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224 |
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225 static void |
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226 MME_PlayAudio(_THIS) |
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227 { |
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228 /* Queue it up */ |
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229 waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR)); |
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230 next_buffer = (next_buffer + 1) % NUM_BUFFERS; |
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231 } |
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232 |
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233 static void |
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234 MME_WaitDone(_THIS) |
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235 { |
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236 MMRESULT result; |
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237 int i; |
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238 |
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239 if (shm->sound) { |
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240 for (i = 0; i < NUM_BUFFERS; i++) |
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241 while (inUse[i]) { |
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242 mmeWaitForCallbacks(); |
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243 mmeProcessCallbacks(); |
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244 } |
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245 result = waveOutReset(shm->sound); |
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246 if (result != MMSYSERR_NOERROR) |
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247 SetMMerror("waveOutReset()", result); |
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248 mmeProcessCallbacks(); |
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249 } |
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250 } |
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251 |
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252 static void |
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253 MME_CloseAudio(_THIS) |
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254 { |
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255 MMRESULT result; |
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256 |
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257 if (mixbuf) { |
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258 result = mmeFreeBuffer(mixbuf); |
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259 if (result != MMSYSERR_NOERROR) |
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260 SetMMerror("mmeFreeBuffer", result); |
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261 mixbuf = NULL; |
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262 } |
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263 |
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264 if (shm) { |
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265 if (shm->sound) { |
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266 result = waveOutClose(shm->sound); |
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267 if (result != MMSYSERR_NOERROR) |
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268 SetMMerror("waveOutClose()", result); |
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269 mmeProcessCallbacks(); |
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270 } |
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271 result = mmeFreeMem(shm); |
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272 if (result != MMSYSERR_NOERROR) |
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273 SetMMerror("mmeFreeMem()", result); |
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274 shm = NULL; |
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275 } |
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276 } |
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277 |
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278 /* vi: set ts=4 sw=4 expandtab: */ |