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annotate src/audio/SDL_sysaudio.h @ 2665:f39a056aec8b gsoc2008_audio_resampling

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More streamer work.
author Aaron Wishnick <schnarf@gmail.com>
date Tue, 12 Aug 2008 01:03:05 +0000
parents 866052b01ee5
children e12ccc6c9576
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 #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 /* Streamer */
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72 typedef struct
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73 {
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74 Uint8 *buffer;
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75 int max_len; /* the maximum length in bytes */
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76 int read_pos, write_pos; /* the position of the write and read heads in bytes */
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77 } SDL_AudioStreamer;
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78
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79
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80 /* Define the SDL audio driver structure */
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81 struct SDL_AudioDevice
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82 {
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83 /* * * */
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84 /* Data common to all devices */
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85
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86 /* The current audio specification (shared with audio thread) */
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87 SDL_AudioSpec spec;
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88
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89 /* An audio conversion block for audio format emulation */
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90 SDL_AudioCVT convert;
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91
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92 /* The streamer, if sample rate conversion necessitates it */
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93 int use_streamer;
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94 SDL_AudioStreamer streamer;
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95
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96 /* Current state flags */
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97 int iscapture;
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98 int enabled;
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99 int paused;
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100 int opened;
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101
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102 /* Fake audio buffer for when the audio hardware is busy */
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103 Uint8 *fake_stream;
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104
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105 /* A semaphore for locking the mixing buffers */
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106 SDL_mutex *mixer_lock;
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107
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108 /* A thread to feed the audio device */
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109 SDL_Thread *thread;
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110 Uint32 threadid;
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111
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112 /* * * */
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113 /* Data private to this driver */
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114 struct SDL_PrivateAudioData *hidden;
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115 };
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116 #undef _THIS
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117
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118 typedef struct AudioBootStrap
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119 {
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120 const char *name;
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121 const char *desc;
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122 int (*init) (SDL_AudioDriverImpl * impl);
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123 int demand_only:1; /* 1==request explicitly, or it won't be available. */
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124 } AudioBootStrap;
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125
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126 #endif /* _SDL_sysaudio_h */
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127
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128 /* vi: set ts=4 sw=4 expandtab: */