1 | /* -*- mode: C; tab-width:8; c-basic-offset:8 -*- |
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2 | * vi:set ts=8: |
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3 | * |
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4 | * al_ext_mp3.c |
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5 | * |
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6 | * Temporary hack. |
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7 | */ |
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8 | #include "al_siteconfig.h" |
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9 | |
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10 | #include <AL/al.h> |
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11 | #include <stdio.h> |
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12 | #include <string.h> |
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13 | |
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14 | #include "al_ext_needed.h" |
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15 | #include "al_ext_mp3.h" |
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16 | |
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17 | #include "al_buffer.h" |
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18 | #include "al_ext.h" |
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19 | #include "alc/alc_context.h" |
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20 | |
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21 | #define MAX_MP3 64 |
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22 | #define MAX_MPEG_READ 512 |
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23 | |
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24 | #ifdef ENABLE_EXTENSION_AL_EXT_MP3 |
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25 | |
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26 | #include <SDL/SDL.h> |
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27 | #include <smpeg.h> |
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28 | |
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29 | #ifdef OPENAL_DLOPEN_MP3 |
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30 | #include <dlfcn.h> |
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31 | #endif |
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32 | |
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33 | |
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34 | /* maximum MAX_MP3 simultaneous sid/offset */ |
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35 | static struct { |
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36 | ALuint bid; |
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37 | SMPEG *mpeg; |
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38 | } mp3bid[MAX_MP3]; |
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39 | |
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40 | static struct { |
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41 | ALuint sid; |
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42 | ALuint offset; |
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43 | } mp3map[MAX_MP3]; |
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44 | |
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45 | |
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46 | static int openal_load_smpeg_library(void); |
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47 | |
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48 | /* |
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49 | * smpeg library functions. |
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50 | */ |
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51 | static void (*pSMPEG_enablevideo)( SMPEG* mpeg, int enable ); |
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52 | static SMPEGstatus (*pSMPEG_status)( SMPEG* mpeg ); |
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53 | static int (*pSMPEG_wantedSpec)( SMPEG *mpeg, SDL_AudioSpec *wanted ); |
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54 | static void (*pSMPEG_enableaudio)( SMPEG* mpeg, int enable ); |
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55 | static void (*pSMPEG_actualSpec)( SMPEG *mpeg, SDL_AudioSpec *spec ); |
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56 | static void (*pSMPEG_rewind)( SMPEG* mpeg ); |
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57 | static int (*pSMPEG_playAudio)( SMPEG *mpeg, Uint8 *stream, int len ); |
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58 | static void (*pSMPEG_stop)( SMPEG* mpeg ); |
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59 | static SMPEG* (*pSMPEG_new_data)(void *data, int size, SMPEG_Info* info, int sdl_audio); |
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60 | static void (*pSMPEG_play)( SMPEG* mpeg ); |
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61 | static void (*pSMPEG_delete)( SMPEG* mpeg ); |
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62 | |
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63 | /* |
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64 | * smpeg library handle. |
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65 | */ |
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66 | static void * smpeg_lib_handle = NULL; |
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67 | |
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68 | static int openal_load_smpeg_library(void) |
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69 | { |
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70 | #ifdef OPENAL_DLOPEN_MP3 |
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71 | char * error = NULL; |
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72 | #endif |
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73 | |
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74 | if (smpeg_lib_handle != NULL) |
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75 | return 1; /* already loaded. */ |
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76 | |
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77 | #ifdef OPENAL_DLOPEN_MP3 |
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78 | #define OPENAL_LOAD_SMPEG_SYMBOL(x) p##x = dlsym(smpeg_lib_handle, #x); \ |
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79 | error = dlerror(); \ |
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80 | if (p##x == NULL) { \ |
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81 | fprintf(stderr,"Could not resolve smpeg symbol %s: %s\n", #x, ((error!=NULL)?(error):("(null)"))); \ |
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82 | dlclose(smpeg_lib_handle); smpeg_lib_handle = NULL; \ |
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83 | return 0; } |
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84 | dlerror(); /* clear error state */ |
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85 | smpeg_lib_handle = dlopen("libsmpeg.so", RTLD_LAZY | RTLD_GLOBAL); |
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86 | error = dlerror(); |
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87 | if (smpeg_lib_handle == NULL) { |
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88 | fprintf(stderr,"Could not open smpeg library: %s\n",((error!=NULL)?(error):("(null)"))); |
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89 | return 0; |
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90 | } |
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91 | #else |
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92 | #define OPENAL_LOAD_SMPEG_SYMBOL(x) p##x = x; |
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93 | smpeg_lib_handle = (void *) 0xF00DF00D; |
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94 | #endif |
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95 | |
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96 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_enablevideo); |
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97 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_status); |
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98 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_wantedSpec); |
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99 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_enableaudio); |
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100 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_actualSpec); |
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101 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_rewind); |
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102 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_playAudio); |
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103 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_stop); |
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104 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_new_data); |
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105 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_play); |
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106 | OPENAL_LOAD_SMPEG_SYMBOL(SMPEG_delete); |
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107 | |
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108 | return 1; |
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109 | } |
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110 | |
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111 | |
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112 | #ifdef OPENAL_EXTENSION |
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113 | |
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114 | /* |
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115 | * we are not being build into the library, therefore define the |
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116 | * table that informs openal how to register the extensions upon |
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117 | * dlopen. |
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118 | */ |
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119 | struct { ALubyte *name; void *addr; } alExtension_03282000 [] = { |
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120 | AL_EXT_PAIR(alutLoadMP3_LOKI), |
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121 | { NULL, NULL } |
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122 | }; |
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123 | |
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124 | void alExtInit_03282000(void) { |
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125 | int i; |
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126 | |
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127 | for(i = 0; i < MAX_MP3; i++) { |
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128 | mp3map[i].sid = 0; |
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129 | mp3map[i].offset = 0; |
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130 | |
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131 | mp3bid[i].bid = 0; |
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132 | mp3bid[i].mpeg = NULL; |
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133 | } |
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134 | |
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135 | return; |
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136 | } |
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137 | |
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138 | void alExtFini_03282000(void) { |
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139 | int i; |
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140 | |
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141 | fprintf(stderr, "alExtFini_03282000 STUB\n"); |
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142 | |
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143 | for(i = 0; i < MAX_MP3; i++) { |
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144 | if(mp3bid[i].mpeg != NULL) { |
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145 | /* Do something */ |
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146 | } |
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147 | } |
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148 | |
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149 | return; |
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150 | } |
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151 | |
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152 | #endif |
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153 | |
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154 | void MP3_DestroyCallback_Sid(ALuint sid); |
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155 | void MP3_DestroyCallback_Bid(ALuint bid); |
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156 | |
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157 | static int mp3bid_get(ALuint bid, SMPEG **mpegp); |
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158 | static int mp3bid_insert(ALuint bid, SMPEG *mpeg); |
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159 | static void mp3bid_remove(ALuint bid); |
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160 | |
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161 | static int mp3map_get(ALuint sid, ALuint *offset); |
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162 | static int mp3map_insert(ALuint sid); |
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163 | static void mp3map_update(int i, ALuint offset); |
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164 | static void mp3map_remove(ALuint sid); |
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165 | |
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166 | ALboolean alutLoadMP3_LOKI(ALuint bid, ALvoid *data, ALint size) { |
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167 | static void (*palBufferi_LOKI)(ALuint, ALenum, ALint) = NULL; |
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168 | SMPEG *newMpeg; |
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169 | SDL_AudioSpec spec; |
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170 | |
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171 | if(palBufferi_LOKI == NULL) { |
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172 | palBufferi_LOKI = (void (*)(ALuint, ALenum, ALint)) |
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173 | alGetProcAddress((const ALchar *) "alBufferi_LOKI"); |
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174 | |
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175 | if(palBufferi_LOKI == NULL) { |
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176 | fprintf(stderr, "Need alBufferi_LOKI\n"); |
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177 | return AL_FALSE; |
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178 | } |
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179 | |
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180 | if (!openal_load_smpeg_library()) |
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181 | return AL_FALSE; |
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182 | |
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183 | } |
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184 | |
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185 | newMpeg = pSMPEG_new_data( data, size, NULL, 0 ); |
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186 | |
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187 | pSMPEG_wantedSpec( newMpeg, &spec ); |
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188 | |
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189 | _alcDCLockContext(); |
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190 | |
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191 | spec.freq = canon_speed; |
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192 | spec.format = AUDIO_S16; /* FIXME */ |
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193 | |
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194 | _alcDCUnlockContext(); |
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195 | |
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196 | /* implicitly multichannel */ |
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197 | palBufferi_LOKI( bid, AL_CHANNELS, spec.channels ); |
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198 | |
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199 | pSMPEG_actualSpec( newMpeg, &spec ); |
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200 | |
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201 | /* insert new bid */ |
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202 | mp3bid_insert( bid, newMpeg ); |
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203 | |
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204 | _alBufferDataWithCallback_LOKI(bid, |
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205 | MP3_Callback, |
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206 | mp3map_remove, |
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207 | mp3bid_remove); |
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208 | |
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209 | return AL_TRUE; |
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210 | } |
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211 | |
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212 | |
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213 | ALint MP3_Callback(ALuint sid, |
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214 | ALuint bid, |
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215 | ALshort *outdata, |
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216 | ALenum format, |
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217 | UNUSED(ALint freq), |
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218 | ALint samples) { |
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219 | int first; |
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220 | int second; |
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221 | SMPEG *mpeg; |
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222 | ALuint offset; |
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223 | int bytesRequested = samples * sizeof( ALshort ); |
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224 | int bytesPlayed; |
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225 | int bps; /* bytes per sample */ |
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226 | int i; |
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227 | |
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228 | if(samples > MAX_MPEG_READ) { |
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229 | first = MP3_Callback(sid, bid, outdata, format, freq, MAX_MPEG_READ); |
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230 | second = MP3_Callback(sid, bid, outdata + MAX_MPEG_READ, format, freq, samples - MAX_MPEG_READ); |
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231 | return first + second; |
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232 | |
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233 | } |
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234 | |
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235 | bps = _alGetBitsFromFormat( format ); |
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236 | |
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237 | /* get buffer specific information */ |
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238 | i = mp3bid_get( bid, &mpeg ); |
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239 | if(i == -1) { |
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240 | fprintf(stderr, "No buffer id %d in data structures\n", bid); |
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241 | |
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242 | return -1; /* weird */ |
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243 | } |
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244 | |
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245 | /* get source specific information */ |
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246 | i = mp3map_get( sid, &offset ); |
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247 | if(i == -1) { |
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248 | i = mp3map_insert( sid ); |
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249 | |
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250 | offset = AL_FALSE; |
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251 | |
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252 | pSMPEG_enableaudio( mpeg, 1 ); |
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253 | pSMPEG_enablevideo( mpeg, 0 ); /* sanity check */ |
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254 | } |
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255 | |
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256 | if( pSMPEG_status(mpeg) != SMPEG_PLAYING ) { |
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257 | pSMPEG_play( mpeg ); |
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258 | } |
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259 | |
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260 | memset( outdata, 0, (size_t)bytesRequested ); |
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261 | |
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262 | bytesPlayed = pSMPEG_playAudio( mpeg, (ALubyte *) outdata, bytesRequested ); |
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263 | bytesPlayed /= 2; |
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264 | |
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265 | if(bytesPlayed < samples) { |
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266 | pSMPEG_stop( mpeg ); |
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267 | pSMPEG_rewind( mpeg ); |
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268 | |
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269 | return bytesPlayed; |
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270 | } |
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271 | |
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272 | mp3map_update(i, offset + samples); |
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273 | |
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274 | return samples; |
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275 | } |
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276 | |
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277 | static int mp3bid_get(ALuint bid, SMPEG **mpegp) { |
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278 | int i; |
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279 | |
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280 | for(i = 0; i < MAX_MP3; i++) { |
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281 | if(mp3bid[i].bid == bid) { |
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282 | *mpegp = mp3bid[i].mpeg; |
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283 | |
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284 | return i; |
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285 | } |
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286 | } |
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287 | |
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288 | return -1; |
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289 | } |
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290 | |
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291 | static int mp3bid_insert(ALuint bid, SMPEG *mpeg) { |
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292 | int i; |
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293 | |
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294 | for(i = 0; i < MAX_MP3; i++) { |
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295 | if(mp3bid[i].bid == bid) { |
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296 | if(mp3bid[i].mpeg != NULL) { |
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297 | pSMPEG_stop( mp3bid[i].mpeg ); |
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298 | pSMPEG_delete( mp3bid[i].mpeg ); |
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299 | mp3bid[i].mpeg = NULL; |
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300 | } |
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301 | |
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302 | mp3bid[i].bid = 0; /* flag for next */ |
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303 | } |
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304 | |
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305 | if(mp3bid[i].bid == 0) { |
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306 | mp3bid[i].bid = bid; |
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307 | mp3bid[i].mpeg = mpeg; |
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308 | |
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309 | return i; |
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310 | } |
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311 | } |
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312 | |
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313 | return 0; |
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314 | } |
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315 | |
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316 | static void mp3bid_remove( ALuint bid ) { |
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317 | int i = 0; |
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318 | |
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319 | for(i = 0; i < MAX_MP3; i++) { |
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320 | if(mp3bid[i].bid == (ALuint) bid) { |
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321 | if(mp3bid[i].mpeg != NULL) { |
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322 | pSMPEG_stop( mp3bid[i].mpeg ); |
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323 | pSMPEG_delete(mp3bid[i].mpeg); |
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324 | mp3bid[i].mpeg = NULL; |
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325 | } |
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326 | |
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327 | mp3bid[i].bid = 0; |
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328 | return; |
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329 | } |
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330 | } |
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331 | |
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332 | return; |
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333 | } |
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334 | |
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335 | /* FIXME: make binary search */ |
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336 | static int mp3map_get(ALuint sid, ALuint *offset) { |
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337 | int i; |
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338 | |
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339 | for(i = 0; i < MAX_MP3; i++) { |
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340 | if(mp3map[i].sid == sid) { |
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341 | *offset = mp3map[i].offset; |
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342 | |
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343 | return i; |
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344 | } |
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345 | } |
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346 | |
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347 | return -1; |
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348 | } |
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349 | |
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350 | /* FIXME: sorted insert for binary search */ |
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351 | static int mp3map_insert(ALuint sid) { |
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352 | int i; |
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353 | |
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354 | for(i = 0; i < MAX_MP3; i++) { |
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355 | if((mp3map[i].sid == 0) || |
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356 | (mp3map[i].sid == sid)) { |
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357 | mp3map[i].sid = sid; |
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358 | mp3map[i].offset = AL_FALSE; |
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359 | |
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360 | return i; |
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361 | } |
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362 | } |
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363 | |
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364 | return 0; |
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365 | } |
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366 | |
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367 | static void mp3map_update(int i, ALuint offset) { |
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368 | if(i < 0) { |
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369 | return; |
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370 | } |
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371 | |
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372 | if(i >= MAX_MP3) { |
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373 | return; |
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374 | } |
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375 | |
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376 | mp3map[i].offset = offset; |
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377 | |
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378 | return; |
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379 | } |
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380 | |
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381 | static void mp3map_remove(ALuint sid) { |
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382 | int i; |
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383 | |
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384 | for(i = 0; i < MAX_MP3; i++) { |
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385 | if(mp3map[i].sid == sid) { |
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386 | mp3map[i].sid = 0; |
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387 | mp3map[i].offset = AL_FALSE; |
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388 | |
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389 | return; |
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390 | } |
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391 | } |
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392 | |
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393 | return; |
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394 | } |
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395 | |
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396 | #else |
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397 | |
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398 | /* without smpeg support, we don't do jack */ |
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399 | |
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400 | #endif /* ENABLE_EXTENSION_AL_EXT_MP3 */ |
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