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annotate src/audio/SDL_sysaudio.h @ 2915:deb377097225

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Fixed CPU feature detection on x86_64 platform (registers were being corrupted, causing crashes)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 24 Dec 2008 13:13:38 +0000
parents 99210400e8b9
children 0d1b16ee0bca
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 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 #define _THIS SDL_AudioDevice *_this
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33
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34 typedef struct SDL_AudioDriverImpl
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35 {
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36 int (*DetectDevices) (int iscapture);
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37 const char *(*GetDeviceName) (int index, int iscapture);
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38 int (*OpenDevice) (_THIS, const char *devname, int iscapture);
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39 void (*ThreadInit) (_THIS); /* Called by audio thread at start */
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40 void (*WaitDevice) (_THIS);
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41 void (*PlayDevice) (_THIS);
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42 Uint8 *(*GetDeviceBuf) (_THIS);
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43 void (*WaitDone) (_THIS);
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44 void (*CloseDevice) (_THIS);
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45 void (*LockDevice) (_THIS);
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46 void (*UnlockDevice) (_THIS);
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47 void (*Deinitialize) (void);
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48
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49 /* Some flags to push duplicate code into the core and reduce #ifdefs. */
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50 int ProvidesOwnCallbackThread:1;
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51 int SkipMixerLock:1;
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52 int HasCaptureSupport:1;
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53 int OnlyHasDefaultOutputDevice:1;
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54 int OnlyHasDefaultInputDevice:1;
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55 } SDL_AudioDriverImpl;
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56
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57
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58 typedef struct SDL_AudioDriver
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59 {
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60 /* * * */
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61 /* The name of this audio driver */
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62 const char *name;
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63
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64 /* * * */
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65 /* The description of this audio driver */
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66 const char *desc;
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67
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68 SDL_AudioDriverImpl impl;
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69 } SDL_AudioDriver;
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70
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71
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72 /* Streamer */
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73 typedef struct
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74 {
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75 Uint8 *buffer;
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76 int max_len; /* the maximum length in bytes */
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77 int read_pos, write_pos; /* the position of the write and read heads in bytes */
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78 } SDL_AudioStreamer;
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79
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80
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81 /* Define the SDL audio driver structure */
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82 struct SDL_AudioDevice
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83 {
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84 /* * * */
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85 /* Data common to all devices */
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86
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87 /* The current audio specification (shared with audio thread) */
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88 SDL_AudioSpec spec;
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89
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90 /* An audio conversion block for audio format emulation */
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91 SDL_AudioCVT convert;
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92
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93 /* The streamer, if sample rate conversion necessitates it */
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94 int use_streamer;
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95 SDL_AudioStreamer streamer;
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96
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97 /* Current state flags */
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98 int iscapture;
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99 int enabled;
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100 int paused;
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101 int opened;
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102
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103 /* Fake audio buffer for when the audio hardware is busy */
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104 Uint8 *fake_stream;
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105
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106 /* A semaphore for locking the mixing buffers */
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107 SDL_mutex *mixer_lock;
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108
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109 /* A thread to feed the audio device */
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110 SDL_Thread *thread;
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111 Uint32 threadid;
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112
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113 /* * * */
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114 /* Data private to this driver */
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115 struct SDL_PrivateAudioData *hidden;
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116 };
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117 #undef _THIS
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118
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119 typedef struct AudioBootStrap
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120 {
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121 const char *name;
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122 const char *desc;
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123 int (*init) (SDL_AudioDriverImpl * impl);
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124 int demand_only:1; /* 1==request explicitly, or it won't be available. */
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125 } AudioBootStrap;
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126
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127 #endif /* _SDL_sysaudio_h */
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128
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129 /* vi: set ts=4 sw=4 expandtab: */