Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 1687:d36048e8e302 SDL-1.3

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jun 2006 13:54:27 +0000
parents 4da1ee79c9af
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 #include "SDL_config.h"
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23
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24 /*
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25 MiNT audio driver
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26 using XBIOS functions (MacSound compatible driver)
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27
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28 Patrice Mandin
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29 */
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30
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31 #include <support.h>
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32
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33 /* Mint includes */
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34 #include <mint/osbind.h>
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35 #include <mint/falcon.h>
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36 #include <mint/cookie.h>
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37
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38 #include "SDL_audio.h"
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39 #include "../SDL_audio_c.h"
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40 #include "../SDL_sysaudio.h"
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41
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42 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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43
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44 #include "SDL_mintaudio.h"
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45 #include "SDL_mintaudio_mcsn.h"
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46
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47 /*--- Defines ---*/
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48
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49 #define MINT_AUDIO_DRIVER_NAME "mint_mcsn"
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50
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51 /* Debug print info */
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52 #define DEBUG_NAME "audio:mcsn: "
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53 #if 0
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54 #define DEBUG_PRINT(what) \
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55 { \
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56 printf what; \
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57 }
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58 #else
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59 #define DEBUG_PRINT(what)
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60 #endif
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61
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62 /*--- Static variables ---*/
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63
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64 static unsigned long cookie_snd, cookie_mch;
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65 static cookie_mcsn_t *cookie_mcsn;
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66
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67 /*--- Audio driver functions ---*/
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68
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69 static void Mint_CloseAudio(_THIS);
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70 static int Mint_OpenAudio(_THIS, SDL_AudioSpec * spec);
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71 static void Mint_LockAudio(_THIS);
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72 static void Mint_UnlockAudio(_THIS);
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73
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74 /* To check/init hardware audio */
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75 static int Mint_CheckAudio(_THIS, SDL_AudioSpec * spec);
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76 static void Mint_InitAudio(_THIS, SDL_AudioSpec * spec);
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77
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78 /*--- Audio driver bootstrap functions ---*/
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79
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80 static int
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81 Audio_Available(void)
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82 {
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83 unsigned long dummy;
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84 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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85
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86 SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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88 /* We can't use XBIOS in interrupt with Magic, don't know about thread */
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89 if (Getcookie(C_MagX, &dummy) == C_FOUND) {
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90 return (0);
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91 }
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93 /* Check if user asked a different audio driver */
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94 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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95 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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96 return (0);
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97 }
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98
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99 /* Cookie _MCH present ? if not, assume ST machine */
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100 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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101 cookie_mch = MCH_ST;
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102 }
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103
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104 /* Cookie _SND present ? if not, assume ST machine */
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105 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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106 cookie_snd = SND_PSG;
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107 }
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108
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109 /* Check if we have 16 bits audio */
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110 if ((cookie_snd & SND_16BIT) == 0) {
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111 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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112 return (0);
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113 }
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115 /* Cookie MCSN present ? */
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116 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
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117 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
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118 return (0);
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119 }
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120
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121 /* Check if interrupt at end of replay */
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122 if (cookie_mcsn->pint == 0) {
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123 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
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124 return (0);
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125 }
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126
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127 /* Check if audio is lockable */
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128 if (Locksnd() != 1) {
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129 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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130 return (0);
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131 }
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132
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133 Unlocksnd();
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134
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135 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
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136 return (1);
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137 }
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138
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139 static void
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140 Audio_DeleteDevice(SDL_AudioDevice * device)
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141 {
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142 SDL_free(device->hidden);
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143 SDL_free(device);
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144 }
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145
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146 static SDL_AudioDevice *
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147 Audio_CreateDevice(int devindex)
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148 {
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149 SDL_AudioDevice *this;
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150
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151 /* Initialize all variables that we clean on shutdown */
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152 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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153 if (this) {
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154 SDL_memset(this, 0, (sizeof *this));
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155 this->hidden = (struct SDL_PrivateAudioData *)
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156 SDL_malloc((sizeof *this->hidden));
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157 }
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158 if ((this == NULL) || (this->hidden == NULL)) {
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159 SDL_OutOfMemory();
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160 if (this) {
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161 SDL_free(this);
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162 }
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163 return (0);
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164 }
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165 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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166
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167 /* Set the function pointers */
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168 this->OpenAudio = Mint_OpenAudio;
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169 this->CloseAudio = Mint_CloseAudio;
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170 this->LockAudio = Mint_LockAudio;
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171 this->UnlockAudio = Mint_UnlockAudio;
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172 this->free = Audio_DeleteDevice;
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173
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174 return this;
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175 }
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176
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177 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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178 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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179 Audio_Available, Audio_CreateDevice
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180 };
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181
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182 static void
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183 Mint_LockAudio(_THIS)
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184 {
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185 /* Stop replay */
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186 Buffoper(0);
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187 }
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188
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189 static void
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190 Mint_UnlockAudio(_THIS)
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191 {
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192 /* Restart replay */
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193 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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194 }
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195
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196 static void
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197 Mint_CloseAudio(_THIS)
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198 {
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199 /* Stop replay */
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200 SDL_MintAudio_WaitThread();
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201 Buffoper(0);
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202
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203 if (!SDL_MintAudio_mint_present) {
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204 /* Uninstall interrupt */
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205 Jdisint(MFP_DMASOUND);
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206 }
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207
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208 /* Wait if currently playing sound */
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209 while (SDL_MintAudio_mutex != 0) {
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210 }
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211
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212 /* Clear buffers */
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213 if (SDL_MintAudio_audiobuf[0]) {
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214 Mfree(SDL_MintAudio_audiobuf[0]);
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215 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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216 }
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217
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218 /* Unlock sound system */
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219 Unlocksnd();
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220 }
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221
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222 static int
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223 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
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224 {
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225 int i;
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226 unsigned long masterclock, masterprediv;
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227
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228 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", spec->format & 0x00ff));
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229 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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230 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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231 DEBUG_PRINT(("channels=%d, ", spec->channels));
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232 DEBUG_PRINT(("freq=%d\n", spec->freq));
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233
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234 /* Check formats available */
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235 MINTAUDIO_freqcount = 0;
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236 switch (cookie_mcsn->play) {
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237 case MCSN_ST:
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238 spec->channels = 1;
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239 spec->format = 8; /* FIXME: is it signed or unsigned ? */
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240 SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
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241 break;
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242 case MCSN_TT: /* Also STE, Mega STE */
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243 spec->format = AUDIO_S8;
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244 masterclock = MASTERCLOCK_STE;
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245 masterprediv = MASTERPREDIV_STE;
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246 if ((cookie_mch >> 16) == MCH_TT) {
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247 masterclock = MASTERCLOCK_TT;
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248 masterprediv = MASTERPREDIV_TT;
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249 }
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250 for (i = 0; i < 4; i++) {
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251 SDL_MintAudio_AddFrequency(this,
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252 masterclock / (masterprediv *
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253 (1 << i)),
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254 masterclock, 3 - i, -1);
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255 }
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256 break;
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257 case MCSN_FALCON: /* Also Mac */
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258 for (i = 1; i < 12; i++) {
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259 /* Remove unusable Falcon codec predivisors */
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260 if ((i == 6) || (i == 8) || (i == 10)) {
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261 continue;
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262 }
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263 SDL_MintAudio_AddFrequency(this,
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264 MASTERCLOCK_FALCON1 /
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265 (MASTERPREDIV_FALCON * (i + 1)),
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266 CLK25M, i + 1, -1);
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267 }
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268 if (cookie_mcsn->res1 != 0) {
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269 for (i = 1; i < 4; i++) {
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270 SDL_MintAudio_AddFrequency(this,
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271 (cookie_mcsn->res1) /
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272 (MASTERPREDIV_FALCON *
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273 (1 << i)), CLKEXT,
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274 (1 << i) - 1, -1);
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275 }
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276 }
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277 spec->format |= 0x8000; /* Audio is always signed */
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278 if ((spec->format & 0x00ff) == 16) {
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279 spec->format |= 0x1000; /* Audio is always big endian */
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280 spec->channels = 2; /* 16 bits always stereo */
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281 }
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282 break;
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283 }
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284
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285 #if 1
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286 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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287 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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288 i, MINTAUDIO_frequencies[i].frequency,
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289 MINTAUDIO_frequencies[i].masterclock,
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290 MINTAUDIO_frequencies[i].predivisor));
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291 }
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292 #endif
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293
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294 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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295 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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296
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297 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", spec->format & 0x00ff));
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298 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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299 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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300 DEBUG_PRINT(("channels=%d, ", spec->channels));
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301 DEBUG_PRINT(("freq=%d\n", spec->freq));
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302
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303 return 0;
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304 }
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305
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306 static void
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307 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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308 {
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309 int channels_mode, prediv, dmaclock;
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310 void *buffer;
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311
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312 /* Stop currently playing sound */
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313 SDL_MintAudio_quit_thread = SDL_FALSE;
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314 SDL_MintAudio_thread_finished = SDL_TRUE;
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315 SDL_MintAudio_WaitThread();
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316 Buffoper(0);
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317
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318 /* Set replay tracks */
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319 Settracks(0, 0);
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320 Setmontracks(0);
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321
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322 /* Select replay format */
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323 channels_mode = STEREO16;
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324 switch (spec->format & 0xff) {
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325 case 8:
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326 if (spec->channels == 2) {
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327 channels_mode = STEREO8;
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328 } else {
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329 channels_mode = MONO8;
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330 }
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331 break;
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332 }
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333 if (Setmode(channels_mode) < 0) {
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334 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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335 }
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336
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337 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
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338 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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339 switch (cookie_mcsn->play) {
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340 case MCSN_TT:
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341 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
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342 Soundcmd(SETPRESCALE, prediv);
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343 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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344 break;
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345 case MCSN_FALCON:
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346 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
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347 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
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348 break;
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349 }
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350
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351 /* Set buffer */
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352 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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353 if (Setbuffer(0, buffer, buffer + spec->size) < 0) {
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354 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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355 }
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356
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357 if (SDL_MintAudio_mint_present) {
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358 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
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359 } else {
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360 /* Install interrupt */
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361 Jdisint(MFP_DMASOUND);
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362 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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363 Jenabint(MFP_DMASOUND);
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364
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365 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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366 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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367 }
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368 }
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369
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370 /* Go */
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371 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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372 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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373 }
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374
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375 static int
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376 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
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377 {
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378 /* Lock sound system */
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379 if (Locksnd() != 1) {
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380 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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381 return (-1);
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382 }
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383
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384 SDL_MintAudio_device = this;
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385
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386 /* Check audio capabilities */
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387 if (Mint_CheckAudio(this, spec) == -1) {
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388 return -1;
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389 }
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390
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391 SDL_CalculateAudioSpec(spec);
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392
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393 /* Allocate memory for audio buffers in DMA-able RAM */
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394 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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395
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396 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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397 if (SDL_MintAudio_audiobuf[0] == NULL) {
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398 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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399 return (-1);
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400 }
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401 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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402 SDL_MintAudio_numbuf = 0;
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403 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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404 SDL_MintAudio_audiosize = spec->size;
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405 SDL_MintAudio_mutex = 0;
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406
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407 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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408 SDL_MintAudio_audiobuf[0]));
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409 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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410 SDL_MintAudio_audiobuf[1]));
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411
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412 /* Setup audio hardware */
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413 Mint_InitAudio(this, spec);
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414
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415 return (1); /* We don't use SDL threaded audio */
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416 }
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417
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418 /* vi: set ts=4 sw=4 expandtab: */