Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 769:b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Jan 2004 16:49:27 +0000 |
parents | c4803992e09c |
children | 185acc07127a |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
769
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3 Copyright (C) 1997-2004 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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 |
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23 /* |
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24 MiNT audio driver |
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25 using XBIOS functions (GSXB compatible driver) |
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26 |
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27 Patrice Mandin |
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28 */ |
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29 |
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30 #include <stdlib.h> |
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31 #include <stdio.h> |
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32 #include <string.h> |
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33 |
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34 /* Mint includes */ |
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35 #include <mint/osbind.h> |
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36 #include <mint/falcon.h> |
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37 #include <mint/cookie.h> |
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38 |
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39 #include "SDL_endian.h" |
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40 #include "SDL_audio.h" |
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41 #include "SDL_audio_c.h" |
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42 #include "SDL_audiomem.h" |
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43 #include "SDL_sysaudio.h" |
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44 |
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45 #include "SDL_atarimxalloc_c.h" |
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46 |
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47 #include "SDL_mintaudio.h" |
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48 #include "SDL_mintaudio_gsxb.h" |
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49 |
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50 /*--- Defines ---*/ |
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51 |
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52 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb" |
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53 |
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54 /* Debug print info */ |
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55 #define DEBUG_NAME "audio:gsxb: " |
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56 #if 0 |
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57 #define DEBUG_PRINT(what) \ |
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58 { \ |
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59 printf what; \ |
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60 } |
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61 #else |
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62 #define DEBUG_PRINT(what) |
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63 #endif |
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64 |
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65 /*--- Static variables ---*/ |
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66 |
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67 static unsigned long cookie_snd, cookie_gsxb; |
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68 |
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69 /*--- Audio driver functions ---*/ |
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70 |
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71 static void Mint_CloseAudio(_THIS); |
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72 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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73 static void Mint_LockAudio(_THIS); |
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74 static void Mint_UnlockAudio(_THIS); |
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75 |
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76 /* To check/init hardware audio */ |
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77 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec); |
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78 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec); |
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79 |
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80 /*--- Audio driver bootstrap functions ---*/ |
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81 |
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82 static int Audio_Available(void) |
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83 { |
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84 const char *envr = getenv("SDL_AUDIODRIVER"); |
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85 |
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86 /* Check if user asked a different audio driver */ |
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87 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) { |
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n")); |
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89 return(0); |
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90 } |
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91 |
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92 /* Cookie _SND present ? if not, assume ST machine */ |
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
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94 cookie_snd = SND_PSG; |
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95 } |
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96 |
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97 /* Check if we have 16 bits audio */ |
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98 if ((cookie_snd & SND_16BIT)==0) { |
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99 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n")); |
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100 return(0); |
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101 } |
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102 |
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103 /* Cookie GSXB present ? */ |
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104 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND); |
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105 |
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106 /* Is it GSXB ? */ |
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107 if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) { |
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108 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n")); |
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109 return(0); |
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110 } |
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111 |
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112 /* Check if audio is lockable */ |
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113 if (Locksnd()!=1) { |
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114 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n")); |
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115 return(0); |
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116 } |
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117 |
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118 Unlocksnd(); |
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119 |
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120 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n")); |
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121 return(1); |
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122 } |
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123 |
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124 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
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125 { |
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126 free(device->hidden); |
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127 free(device); |
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128 } |
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129 |
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130 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
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131 { |
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132 SDL_AudioDevice *this; |
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133 |
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134 /* Initialize all variables that we clean on shutdown */ |
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135 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
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136 if ( this ) { |
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137 memset(this, 0, (sizeof *this)); |
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138 this->hidden = (struct SDL_PrivateAudioData *) |
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139 malloc((sizeof *this->hidden)); |
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140 } |
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141 if ( (this == NULL) || (this->hidden == NULL) ) { |
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142 SDL_OutOfMemory(); |
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143 if ( this ) { |
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144 free(this); |
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145 } |
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146 return(0); |
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147 } |
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148 memset(this->hidden, 0, (sizeof *this->hidden)); |
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149 |
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150 /* Set the function pointers */ |
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151 this->OpenAudio = Mint_OpenAudio; |
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152 this->CloseAudio = Mint_CloseAudio; |
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153 this->LockAudio = Mint_LockAudio; |
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154 this->UnlockAudio = Mint_UnlockAudio; |
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155 this->free = Audio_DeleteDevice; |
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156 |
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157 return this; |
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158 } |
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159 |
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160 AudioBootStrap MINTAUDIO_GSXB_bootstrap = { |
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161 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver", |
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162 Audio_Available, Audio_CreateDevice |
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163 }; |
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164 |
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165 static void Mint_LockAudio(_THIS) |
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166 { |
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167 /* Stop replay */ |
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168 Buffoper(0); |
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169 } |
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170 |
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171 static void Mint_UnlockAudio(_THIS) |
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172 { |
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173 /* Restart replay */ |
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174 Buffoper(SB_PLA_ENA|SB_PLA_RPT); |
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175 } |
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176 |
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177 static void Mint_CloseAudio(_THIS) |
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178 { |
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179 /* Stop replay */ |
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180 Buffoper(0); |
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181 |
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182 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n")); |
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183 |
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184 /* Uninstall interrupt */ |
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185 if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) { |
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186 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n")); |
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187 } |
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188 |
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189 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n")); |
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190 |
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191 /* Wait if currently playing sound */ |
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192 while (SDL_MintAudio_mutex != 0) { |
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193 } |
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194 |
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195 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n")); |
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196 |
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197 /* Clear buffers */ |
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198 if (SDL_MintAudio_audiobuf[0]) { |
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199 Mfree(SDL_MintAudio_audiobuf[0]); |
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200 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
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201 } |
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202 |
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203 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n")); |
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204 |
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205 /* Unlock sound system */ |
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206 Unlocksnd(); |
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207 } |
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208 |
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209 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec) |
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210 { |
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211 long snd_format; |
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212 int i, resolution, format_signed, format_bigendian; |
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213 |
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214 resolution = spec->format & 0x00ff; |
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215 format_signed = ((spec->format & 0x8000)!=0); |
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216 format_bigendian = ((spec->format & 0x1000)!=0); |
704 | 217 |
218 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff)); | |
219 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); | |
220 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); | |
644
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221 DEBUG_PRINT(("channels=%d, ", spec->channels)); |
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222 DEBUG_PRINT(("freq=%d\n", spec->freq)); |
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223 |
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224 /* Check formats available */ |
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225 snd_format = Sndstatus(SND_QUERYFORMATS); |
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226 switch (resolution) { |
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227 case 8: |
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228 if ((snd_format & SND_FORMAT8)==0) { |
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229 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported"); |
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230 return -1; |
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231 } |
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232 snd_format = Sndstatus(SND_QUERY8BIT); |
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233 break; |
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234 case 16: |
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235 if ((snd_format & SND_FORMAT16)==0) { |
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236 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported"); |
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237 return -1; |
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238 } |
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239 snd_format = Sndstatus(SND_QUERY16BIT); |
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240 break; |
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241 default: |
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242 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution"); |
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243 return -1; |
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244 break; |
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245 } |
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246 |
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247 /* Check signed/unsigned format */ |
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248 if (format_signed) { |
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249 if (snd_format & SND_FORMATSIGNED) { |
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250 /* Ok */ |
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251 } else if (snd_format & SND_FORMATUNSIGNED) { |
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252 /* Give unsigned format */ |
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253 spec->format = spec->format & (~0x8000); |
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254 } |
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255 } else { |
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256 if (snd_format & SND_FORMATUNSIGNED) { |
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257 /* Ok */ |
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258 } else if (snd_format & SND_FORMATSIGNED) { |
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259 /* Give signed format */ |
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260 spec->format |= 0x8000; |
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261 } |
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262 } |
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263 |
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264 if (format_bigendian) { |
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265 if (snd_format & SND_FORMATBIGENDIAN) { |
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266 /* Ok */ |
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267 } else if (snd_format & SND_FORMATLITTLEENDIAN) { |
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268 /* Give little endian format */ |
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269 spec->format = spec->format & (~0x1000); |
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270 } |
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271 } else { |
704 | 272 if (snd_format & SND_FORMATLITTLEENDIAN) { |
644
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273 /* Ok */ |
704 | 274 } else if (snd_format & SND_FORMATBIGENDIAN) { |
644
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275 /* Give big endian format */ |
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276 spec->format |= 0x1000; |
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277 } |
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278 } |
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279 |
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280 /* Calculate and select the closest frequency */ |
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281 MINTAUDIO_sfreq=1; |
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282 MINTAUDIO_nfreq=12; |
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283 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) { |
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284 MINTAUDIO_hardfreq[i]=MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(i+1)); |
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285 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i])); |
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286 } |
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287 |
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288 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq); |
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289 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq]; |
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290 |
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291 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); |
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292 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
704 | 293 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
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294 DEBUG_PRINT(("channels=%d, ", spec->channels)); |
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295 DEBUG_PRINT(("freq=%d\n", spec->freq)); |
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296 |
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297 return 0; |
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298 } |
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299 |
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300 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) |
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301 { |
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302 int channels_mode; |
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303 void *buffer; |
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304 |
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305 /* Stop currently playing sound */ |
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306 Buffoper(0); |
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307 |
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308 /* Set replay tracks */ |
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309 Settracks(0,0); |
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310 Setmontracks(0); |
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311 |
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312 /* Select replay format */ |
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313 switch (spec->format & 0xff) { |
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314 case 8: |
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315 if (spec->channels==2) { |
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316 channels_mode=STEREO8; |
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317 } else { |
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318 channels_mode=MONO8; |
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319 } |
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320 break; |
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321 case 16: |
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322 if (spec->channels==2) { |
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323 channels_mode=STEREO16; |
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324 } else { |
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325 channels_mode=MONO16; |
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326 } |
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327 break; |
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328 default: |
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329 channels_mode=STEREO16; |
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330 break; |
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331 } |
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332 if (Setmode(channels_mode)<0) { |
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333 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); |
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334 } |
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335 |
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336 Devconnect(DMAPLAY, DAC, CLKEXT, MINTAUDIO_numfreq, 1); |
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337 |
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338 /* Set buffer */ |
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339 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
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340 if (Setbuffer(0, buffer, buffer + spec->size)<0) { |
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341 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |
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342 } |
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343 |
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344 /* Install interrupt */ |
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345 if (NSetinterrupt(2, SI_PLAY, SDL_MintAudio_GsxbInterrupt)<0) { |
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346 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n")); |
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347 } |
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348 |
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349 /* Go */ |
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350 Buffoper(SB_PLA_ENA|SB_PLA_RPT); |
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351 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); |
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352 } |
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353 |
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354 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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355 { |
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356 /* Lock sound system */ |
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357 if (Locksnd()!=1) { |
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358 SDL_SetError("Mint_OpenAudio: Audio system already in use"); |
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359 return(-1); |
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360 } |
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361 |
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362 SDL_MintAudio_device = this; |
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363 |
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364 /* Check audio capabilities */ |
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365 if (Mint_CheckAudio(this, spec)==-1) { |
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366 return -1; |
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367 } |
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368 |
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369 SDL_CalculateAudioSpec(spec); |
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370 |
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371 /* Allocate memory for audio buffers in DMA-able RAM */ |
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372 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size)); |
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373 |
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374 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM); |
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375 if (SDL_MintAudio_audiobuf[0]==NULL) { |
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376 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer"); |
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377 return (-1); |
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378 } |
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379 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ; |
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380 SDL_MintAudio_numbuf=0; |
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381 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2); |
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382 SDL_MintAudio_audiosize = spec->size; |
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383 SDL_MintAudio_mutex = 0; |
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384 |
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385 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0])); |
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386 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1])); |
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387 |
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388 /* Setup audio hardware */ |
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389 Mint_InitAudio(this, spec); |
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390 |
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391 return(1); /* We don't use threaded audio */ |
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392 } |