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annotate src/audio/SDL_sysaudio.h @ 2042:3908e1f808e1

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:56:36 +0000
parents c121d94672cb
children 5f6550e5184f 37c9c4590689
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 SDL_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 #ifndef _SDL_sysaudio_h
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25 #define _SDL_sysaudio_h
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26
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27 #include "SDL_mutex.h"
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28 #include "SDL_thread.h"
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29
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30 /* The SDL audio driver */
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31 typedef struct SDL_AudioDevice SDL_AudioDevice;
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32
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33 /* Define the SDL audio driver structure */
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34 #define _THIS SDL_AudioDevice *_this
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35 #ifndef _STATUS
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36 #define _STATUS SDL_status *status
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37 #endif
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38 struct SDL_AudioDevice
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39 {
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40 /* * * */
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41 /* The name of this audio driver */
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42 const char *name;
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43
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44 /* * * */
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45 /* The description of this audio driver */
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46 const char *desc;
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47
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48 /* * * */
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49 /* Public driver functions */
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50 int (*OpenAudio) (_THIS, SDL_AudioSpec * spec);
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51 void (*ThreadInit) (_THIS); /* Called by audio thread at start */
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52 void (*WaitAudio) (_THIS);
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53 void (*PlayAudio) (_THIS);
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54 Uint8 *(*GetAudioBuf) (_THIS);
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55 void (*WaitDone) (_THIS);
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56 void (*CloseAudio) (_THIS);
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57
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58 /* * * */
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59 /* Lock / Unlock functions added for the Mac port */
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60 void (*LockAudio) (_THIS);
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61 void (*UnlockAudio) (_THIS);
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62
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63 /* * * */
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64 /* Data common to all devices */
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65
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66 /* The current audio specification (shared with audio thread) */
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67 SDL_AudioSpec spec;
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68
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69 /* An audio conversion block for audio format emulation */
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70 SDL_AudioCVT convert;
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71
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72 /* Current state flags */
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73 int enabled;
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74 int paused;
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75 int opened;
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76
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77 /* Fake audio buffer for when the audio hardware is busy */
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78 Uint8 *fake_stream;
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79
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80 /* A semaphore for locking the mixing buffers */
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81 SDL_mutex *mixer_lock;
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82
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83 /* A thread to feed the audio device */
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84 SDL_Thread *thread;
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85 Uint32 threadid;
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86
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87 /* * * */
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88 /* Data private to this driver */
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89 struct SDL_PrivateAudioData *hidden;
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90
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91 /* * * */
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92 /* The function used to dispose of this structure */
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93 void (*free) (_THIS);
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94 };
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95 #undef _THIS
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96
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97 typedef struct AudioBootStrap
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98 {
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99 const char *name;
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100 const char *desc;
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101 int (*available) (void);
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102 SDL_AudioDevice *(*create) (int devindex);
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103 } AudioBootStrap;
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104
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105 #if SDL_AUDIO_DRIVER_BSD
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106 extern AudioBootStrap BSD_AUDIO_bootstrap;
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107 #endif
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108 #if SDL_AUDIO_DRIVER_OSS
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109 extern AudioBootStrap DSP_bootstrap;
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110 extern AudioBootStrap DMA_bootstrap;
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111 #endif
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112 #if SDL_AUDIO_DRIVER_ALSA
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113 extern AudioBootStrap ALSA_bootstrap;
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114 #endif
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115 #if SDL_AUDIO_DRIVER_QNXNTO
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116 extern AudioBootStrap QNXNTOAUDIO_bootstrap;
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117 #endif
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118 #if SDL_AUDIO_DRIVER_SUNAUDIO
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119 extern AudioBootStrap SUNAUDIO_bootstrap;
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120 #endif
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121 #if SDL_AUDIO_DRIVER_DMEDIA
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122 extern AudioBootStrap DMEDIA_bootstrap;
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123 #endif
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124 #if SDL_AUDIO_DRIVER_ARTS
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125 extern AudioBootStrap ARTS_bootstrap;
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126 #endif
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127 #if SDL_AUDIO_DRIVER_ESD
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128 extern AudioBootStrap ESD_bootstrap;
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129 #endif
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130 #if SDL_AUDIO_DRIVER_NAS
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131 extern AudioBootStrap NAS_bootstrap;
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132 #endif
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133 #if SDL_AUDIO_DRIVER_DSOUND
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134 extern AudioBootStrap DSOUND_bootstrap;
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135 #endif
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136 #if SDL_AUDIO_DRIVER_WAVEOUT
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137 extern AudioBootStrap WAVEOUT_bootstrap;
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138 #endif
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139 #if SDL_AUDIO_DRIVER_PAUD
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140 extern AudioBootStrap Paud_bootstrap;
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141 #endif
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142 #if SDL_AUDIO_DRIVER_BAUDIO
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143 extern AudioBootStrap BAUDIO_bootstrap;
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144 #endif
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145 #if SDL_AUDIO_DRIVER_COREAUDIO
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146 extern AudioBootStrap COREAUDIO_bootstrap;
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147 #endif
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148 #if SDL_AUDIO_DRIVER_SNDMGR
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149 extern AudioBootStrap SNDMGR_bootstrap;
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150 #endif
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151 #if SDL_AUDIO_DRIVER_AHI
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152 extern AudioBootStrap AHI_bootstrap;
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153 #endif
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154 #if SDL_AUDIO_DRIVER_MINT
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155 extern AudioBootStrap MINTAUDIO_GSXB_bootstrap;
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156 extern AudioBootStrap MINTAUDIO_MCSN_bootstrap;
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157 extern AudioBootStrap MINTAUDIO_STFA_bootstrap;
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158 extern AudioBootStrap MINTAUDIO_XBIOS_bootstrap;
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159 extern AudioBootStrap MINTAUDIO_DMA8_bootstrap;
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160 #endif
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161 #if SDL_AUDIO_DRIVER_DISK
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162 extern AudioBootStrap DISKAUD_bootstrap;
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163 #endif
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164 #if SDL_AUDIO_DRIVER_DUMMY
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165 extern AudioBootStrap DUMMYAUD_bootstrap;
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166 #endif
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167 #if SDL_AUDIO_DRIVER_DC
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168 extern AudioBootStrap DCAUD_bootstrap;
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169 #endif
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170 #if SDL_AUDIO_DRIVER_MMEAUDIO
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171 extern AudioBootStrap MMEAUDIO_bootstrap;
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172 #endif
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173 #if SDL_AUDIO_DRIVER_DART
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174 extern AudioBootStrap DART_bootstrap;
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175 #endif
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176
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177 /* This is the current audio device */
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178 extern SDL_AudioDevice *current_audio;
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179
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180 #endif /* _SDL_sysaudio_h */
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181 /* vi: set ts=4 sw=4 expandtab: */