annotate include/SDL_audio.h @ 1895:c121d94672cb

SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents c71e05b4dc2e
children 071b6598d48f
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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
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23 /**
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24 * \file SDL_audio.h
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25 *
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26 * Access to the raw audio mixing buffer for the SDL library
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27 */
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28
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29 #ifndef _SDL_audio_h
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30 #define _SDL_audio_h
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34 #include "SDL_endian.h"
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35 #include "SDL_mutex.h"
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36 #include "SDL_thread.h"
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37 #include "SDL_rwops.h"
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38
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39 #include "begin_code.h"
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40 /* Set up for C function definitions, even when using C++ */
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41 #ifdef __cplusplus
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42 /* *INDENT-OFF* */
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43 extern "C" {
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44 /* *INDENT-ON* */
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45 #endif
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46
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47 /* The calculated values in this structure are calculated by SDL_OpenAudio() */
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48 typedef struct SDL_AudioSpec
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49 {
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50 int freq; /* DSP frequency -- samples per second */
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51 Uint16 format; /* Audio data format */
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52 Uint8 channels; /* Number of channels: 1 mono, 2 stereo */
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53 Uint8 silence; /* Audio buffer silence value (calculated) */
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54 Uint16 samples; /* Audio buffer size in samples (power of 2) */
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55 Uint16 padding; /* Necessary for some compile environments */
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56 Uint32 size; /* Audio buffer size in bytes (calculated) */
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57 /* This function is called when the audio device needs more data.
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58 'stream' is a pointer to the audio data buffer
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59 'len' is the length of that buffer in bytes.
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60 Once the callback returns, the buffer will no longer be valid.
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61 Stereo samples are stored in a LRLRLR ordering.
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62 */
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63 void (SDLCALL * callback) (void *userdata, Uint8 * stream, int len);
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64 void *userdata;
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65 } SDL_AudioSpec;
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66
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67 /* Audio format flags (defaults to LSB byte order) */
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68 #define AUDIO_U8 0x0008 /* Unsigned 8-bit samples */
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69 #define AUDIO_S8 0x8008 /* Signed 8-bit samples */
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70 #define AUDIO_U16LSB 0x0010 /* Unsigned 16-bit samples */
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71 #define AUDIO_S16LSB 0x8010 /* Signed 16-bit samples */
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72 #define AUDIO_U16MSB 0x1010 /* As above, but big-endian byte order */
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73 #define AUDIO_S16MSB 0x9010 /* As above, but big-endian byte order */
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74 #define AUDIO_U16 AUDIO_U16LSB
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75 #define AUDIO_S16 AUDIO_S16LSB
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76
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77 /* Native audio byte ordering */
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78 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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79 #define AUDIO_U16SYS AUDIO_U16LSB
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80 #define AUDIO_S16SYS AUDIO_S16LSB
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81 #else
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82 #define AUDIO_U16SYS AUDIO_U16MSB
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83 #define AUDIO_S16SYS AUDIO_S16MSB
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84 #endif
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85
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86
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87 /* A structure to hold a set of audio conversion filters and buffers */
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88 typedef struct SDL_AudioCVT
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89 {
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90 int needed; /* Set to 1 if conversion possible */
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91 Uint16 src_format; /* Source audio format */
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92 Uint16 dst_format; /* Target audio format */
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93 double rate_incr; /* Rate conversion increment */
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94 Uint8 *buf; /* Buffer to hold entire audio data */
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95 int len; /* Length of original audio buffer */
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96 int len_cvt; /* Length of converted audio buffer */
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97 int len_mult; /* buffer must be len*len_mult big */
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98 double len_ratio; /* Given len, final size is len*len_ratio */
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99 void (SDLCALL * filters[10]) (struct SDL_AudioCVT * cvt, Uint16 format);
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100 int filter_index; /* Current audio conversion function */
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101 } SDL_AudioCVT;
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102
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103
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104 /* Function prototypes */
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105
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106 /* These functions return the list of built in video drivers, in the
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107 * order that they are normally initialized by default.
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108 */
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109 extern DECLSPEC int SDLCALL SDL_GetNumAudioDrivers(void);
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110 extern DECLSPEC const char *SDLCALL SDL_GetAudioDriver(int index);
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111
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112 /* These functions are used internally, and should not be used unless you
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113 * have a specific need to specify the audio driver you want to use.
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114 * You should normally use SDL_Init() or SDL_InitSubSystem().
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115 */
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116 extern DECLSPEC int SDLCALL SDL_AudioInit(const char *driver_name);
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117 extern DECLSPEC void SDLCALL SDL_AudioQuit(void);
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118
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119 /* This function returns the name of the current audio driver, or NULL
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120 * if no driver has been initialized.
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121 */
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122 extern DECLSPEC const char *SDLCALL SDL_GetCurrentAudioDriver(void);
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123
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124 /*
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125 * This function opens the audio device with the desired parameters, and
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126 * returns 0 if successful, placing the actual hardware parameters in the
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127 * structure pointed to by 'obtained'. If 'obtained' is NULL, the audio
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128 * data passed to the callback function will be guaranteed to be in the
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129 * requested format, and will be automatically converted to the hardware
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130 * audio format if necessary. This function returns -1 if it failed
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131 * to open the audio device, or couldn't set up the audio thread.
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132 *
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133 * When filling in the desired audio spec structure,
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134 * 'desired->freq' should be the desired audio frequency in samples-per-second.
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135 * 'desired->format' should be the desired audio format.
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136 * 'desired->samples' is the desired size of the audio buffer, in samples.
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137 * This number should be a power of two, and may be adjusted by the audio
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138 * driver to a value more suitable for the hardware. Good values seem to
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139 * range between 512 and 8096 inclusive, depending on the application and
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140 * CPU speed. Smaller values yield faster response time, but can lead
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141 * to underflow if the application is doing heavy processing and cannot
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142 * fill the audio buffer in time. A stereo sample consists of both right
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143 * and left channels in LR ordering.
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144 * Note that the number of samples is directly related to time by the
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145 * following formula: ms = (samples*1000)/freq
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146 * 'desired->size' is the size in bytes of the audio buffer, and is
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147 * calculated by SDL_OpenAudio().
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148 * 'desired->silence' is the value used to set the buffer to silence,
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149 * and is calculated by SDL_OpenAudio().
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150 * 'desired->callback' should be set to a function that will be called
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151 * when the audio device is ready for more data. It is passed a pointer
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152 * to the audio buffer, and the length in bytes of the audio buffer.
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153 * This function usually runs in a separate thread, and so you should
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154 * protect data structures that it accesses by calling SDL_LockAudio()
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155 * and SDL_UnlockAudio() in your code.
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156 * 'desired->userdata' is passed as the first parameter to your callback
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157 * function.
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158 *
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159 * The audio device starts out playing silence when it's opened, and should
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160 * be enabled for playing by calling SDL_PauseAudio(0) when you are ready
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161 * for your audio callback function to be called. Since the audio driver
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162 * may modify the requested size of the audio buffer, you should allocate
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163 * any local mixing buffers after you open the audio device.
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164 */
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165 extern DECLSPEC int SDLCALL SDL_OpenAudio(SDL_AudioSpec * desired,
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166 SDL_AudioSpec * obtained);
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167
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168 /*
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169 * Get the current audio state:
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170 */
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171 typedef enum
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172 {
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173 SDL_AUDIO_STOPPED = 0,
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174 SDL_AUDIO_PLAYING,
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175 SDL_AUDIO_PAUSED
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176 } SDL_audiostatus;
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177 extern DECLSPEC SDL_audiostatus SDLCALL SDL_GetAudioStatus(void);
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178
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179 /*
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180 * This function pauses and unpauses the audio callback processing.
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181 * It should be called with a parameter of 0 after opening the audio
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182 * device to start playing sound. This is so you can safely initialize
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183 * data for your callback function after opening the audio device.
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184 * Silence will be written to the audio device during the pause.
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185 */
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186 extern DECLSPEC void SDLCALL SDL_PauseAudio(int pause_on);
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187
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188 /*
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189 * This function loads a WAVE from the data source, automatically freeing
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190 * that source if 'freesrc' is non-zero. For example, to load a WAVE file,
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191 * you could do:
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192 * SDL_LoadWAV_RW(SDL_RWFromFile("sample.wav", "rb"), 1, ...);
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193 *
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194 * If this function succeeds, it returns the given SDL_AudioSpec,
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195 * filled with the audio data format of the wave data, and sets
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196 * 'audio_buf' to a malloc()'d buffer containing the audio data,
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197 * and sets 'audio_len' to the length of that audio buffer, in bytes.
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198 * You need to free the audio buffer with SDL_FreeWAV() when you are
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199 * done with it.
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200 *
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201 * This function returns NULL and sets the SDL error message if the
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202 * wave file cannot be opened, uses an unknown data format, or is
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203 * corrupt. Currently raw and MS-ADPCM WAVE files are supported.
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204 */
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205 extern DECLSPEC SDL_AudioSpec *SDLCALL SDL_LoadWAV_RW(SDL_RWops * src,
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206 int freesrc,
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207 SDL_AudioSpec * spec,
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208 Uint8 ** audio_buf,
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209 Uint32 * audio_len);
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210
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211 /* Compatibility convenience function -- loads a WAV from a file */
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212 #define SDL_LoadWAV(file, spec, audio_buf, audio_len) \
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213 SDL_LoadWAV_RW(SDL_RWFromFile(file, "rb"),1, spec,audio_buf,audio_len)
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214
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215 /*
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216 * This function frees data previously allocated with SDL_LoadWAV_RW()
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217 */
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218 extern DECLSPEC void SDLCALL SDL_FreeWAV(Uint8 * audio_buf);
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219
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220 /*
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221 * This function takes a source format and rate and a destination format
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222 * and rate, and initializes the 'cvt' structure with information needed
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223 * by SDL_ConvertAudio() to convert a buffer of audio data from one format
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224 * to the other.
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225 * This function returns 0, or -1 if there was an error.
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226 */
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227 extern DECLSPEC int SDLCALL SDL_BuildAudioCVT(SDL_AudioCVT * cvt,
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228 Uint16 src_format,
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229 Uint8 src_channels,
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230 int src_rate,
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231 Uint16 dst_format,
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232 Uint8 dst_channels,
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233 int dst_rate);
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234
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235 /* Once you have initialized the 'cvt' structure using SDL_BuildAudioCVT(),
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236 * created an audio buffer cvt->buf, and filled it with cvt->len bytes of
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237 * audio data in the source format, this function will convert it in-place
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238 * to the desired format.
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239 * The data conversion may expand the size of the audio data, so the buffer
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240 * cvt->buf should be allocated after the cvt structure is initialized by
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241 * SDL_BuildAudioCVT(), and should be cvt->len*cvt->len_mult bytes long.
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242 */
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243 extern DECLSPEC int SDLCALL SDL_ConvertAudio(SDL_AudioCVT * cvt);
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244
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245 /*
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246 * This takes two audio buffers of the playing audio format and mixes
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247 * them, performing addition, volume adjustment, and overflow clipping.
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248 * The volume ranges from 0 - 128, and should be set to SDL_MIX_MAXVOLUME
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249 * for full audio volume. Note this does not change hardware volume.
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250 * This is provided for convenience -- you can mix your own audio data.
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251 */
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252 #define SDL_MIX_MAXVOLUME 128
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253 extern DECLSPEC void SDLCALL SDL_MixAudio(Uint8 * dst, const Uint8 * src,
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254 Uint32 len, int volume);
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255
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256 /*
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257 * The lock manipulated by these functions protects the callback function.
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258 * During a LockAudio/UnlockAudio pair, you can be guaranteed that the
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259 * callback function is not running. Do not call these from the callback
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260 * function or you will cause deadlock.
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261 */
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262 extern DECLSPEC void SDLCALL SDL_LockAudio(void);
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263 extern DECLSPEC void SDLCALL SDL_UnlockAudio(void);
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264
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265 /*
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266 * This function shuts down audio processing and closes the audio device.
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267 */
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268 extern DECLSPEC void SDLCALL SDL_CloseAudio(void);
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269
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270
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271 /* Ends C function definitions when using C++ */
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272 #ifdef __cplusplus
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273 /* *INDENT-OFF* */
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274 }
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275 /* *INDENT-ON* */
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276 #endif
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277 #include "close_code.h"
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278
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279 #endif /* _SDL_audio_h */
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280
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281 /* vi: set ts=4 sw=4 expandtab: */