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annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 1095:f10892fa2e48

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XBIOS in interrupt not usable under MiNT
author Patrice Mandin <patmandin@gmail.com>
date Wed, 20 Jul 2005 17:39:10 +0000
parents 176240cf4405
children 524fd51f5d2c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
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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 (MacSound 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_mcsn.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_mcsn"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:mcsn: "
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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_mch;
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68 static cookie_mcsn_t *cookie_mcsn;
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69
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70 /*--- Audio driver functions ---*/
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71
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72 static void Mint_CloseAudio(_THIS);
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73 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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74 static void Mint_LockAudio(_THIS);
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75 static void Mint_UnlockAudio(_THIS);
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76
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77 /* To check/init hardware audio */
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78 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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79 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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80
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81 /*--- Audio driver bootstrap functions ---*/
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82
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83 static int Audio_Available(void)
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84 {
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85 unsigned long dummy;
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86 const char *envr = getenv("SDL_AUDIODRIVER");
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87
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88 /* We can't use XBIOS in interrupt under MiNT */
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89 if (Getcookie(C_MiNT, &dummy) == C_FOUND) {
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90 return(0);
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91 }
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92
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93 /* Check if user asked a different audio driver */
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94 if ((envr) && (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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114
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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 Audio_DeleteDevice(SDL_AudioDevice *device)
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140 {
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141 free(device->hidden);
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142 free(device);
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143 }
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144
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145 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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146 {
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147 SDL_AudioDevice *this;
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148
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149 /* Initialize all variables that we clean on shutdown */
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150 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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151 if ( this ) {
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152 memset(this, 0, (sizeof *this));
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153 this->hidden = (struct SDL_PrivateAudioData *)
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154 malloc((sizeof *this->hidden));
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155 }
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156 if ( (this == NULL) || (this->hidden == NULL) ) {
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diff changeset
157 SDL_OutOfMemory();
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158 if ( this ) {
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159 free(this);
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160 }
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161 return(0);
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162 }
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diff changeset
163 memset(this->hidden, 0, (sizeof *this->hidden));
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164
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165 /* Set the function pointers */
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166 this->OpenAudio = Mint_OpenAudio;
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167 this->CloseAudio = Mint_CloseAudio;
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168 this->LockAudio = Mint_LockAudio;
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169 this->UnlockAudio = Mint_UnlockAudio;
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170 this->free = Audio_DeleteDevice;
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171
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172 return this;
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173 }
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174
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175 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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176 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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177 Audio_Available, Audio_CreateDevice
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178 };
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179
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180 static void Mint_LockAudio(_THIS)
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181 {
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182 /* Stop replay */
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183 Buffoper(0);
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184 }
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185
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186 static void Mint_UnlockAudio(_THIS)
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187 {
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188 /* Restart replay */
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189 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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190 }
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191
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192 static void Mint_CloseAudio(_THIS)
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193 {
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194 /* Stop replay */
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195 Buffoper(0);
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196
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197 /* Uninstall interrupt */
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198 Jdisint(MFP_DMASOUND);
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199
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diff changeset
200 /* Wait if currently playing sound */
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201 while (SDL_MintAudio_mutex != 0) {
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202 }
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203
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204 /* Clear buffers */
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205 if (SDL_MintAudio_audiobuf[0]) {
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206 Mfree(SDL_MintAudio_audiobuf[0]);
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207 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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208 }
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209
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210 /* Unlock sound system */
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211 Unlocksnd();
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212 }
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213
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214 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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215 {
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216 int i;
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217 unsigned long masterclock, masterprediv;
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218
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219 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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220 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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221 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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222 DEBUG_PRINT(("channels=%d, ", spec->channels));
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223 DEBUG_PRINT(("freq=%d\n", spec->freq));
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224
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225 /* Check formats available */
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226 MINTAUDIO_freqcount=0;
644
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diff changeset
227 switch(cookie_mcsn->play) {
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228 case MCSN_ST:
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229 spec->channels=1;
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230 spec->format=8; /* FIXME: is it signed or unsigned ? */
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231 SDL_MintAudio_AddFrequency(this, 12500, 0, 0);
644
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232 break;
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233 case MCSN_TT: /* Also STE, Mega STE */
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234 spec->format=AUDIO_S8;
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235 masterclock=MASTERCLOCK_STE;
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236 masterprediv=MASTERPREDIV_STE;
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diff changeset
237 if ((cookie_mch>>16)==MCH_TT) {
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diff changeset
238 masterclock=MASTERCLOCK_TT;
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239 masterprediv=MASTERPREDIV_TT;
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240 }
961
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diff changeset
241 for (i=0; i<4; i++) {
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diff changeset
242 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, 3-i);
644
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243 }
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244 break;
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245 case MCSN_FALCON: /* Also Mac */
961
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diff changeset
246 for (i=1; i<12; i++) {
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diff changeset
247 /* Remove unusable Falcon codec predivisors */
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diff changeset
248 if ((i==6) || (i==8) || (i==10)) {
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diff changeset
249 continue;
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diff changeset
250 }
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diff changeset
251 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), CLK25M, i+1);
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diff changeset
252 }
644
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diff changeset
253 if (cookie_mcsn->res1 != 0) {
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diff changeset
254 for (i=1; i<4; i++) {
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diff changeset
255 SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)), CLKEXT, (1<<i)-1);
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diff changeset
256 }
644
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diff changeset
257 }
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diff changeset
258 spec->format |= 0x8000; /* Audio is always signed */
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diff changeset
259 if ((spec->format & 0x00ff)==16) {
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diff changeset
260 spec->format |= 0x1000; /* Audio is always big endian */
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diff changeset
261 spec->channels=2; /* 16 bits always stereo */
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diff changeset
262 }
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diff changeset
263 break;
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diff changeset
264 }
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diff changeset
265
961
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diff changeset
266 #if 1
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267 for (i=0; i<MINTAUDIO_freqcount; i++) {
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diff changeset
268 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
269 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
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diff changeset
270 MINTAUDIO_frequencies[i].predivisor
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diff changeset
271 ));
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diff changeset
272 }
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273 #endif
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274
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275 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
276 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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277
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diff changeset
278 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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279 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
280 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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281 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
282 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
283
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284 return 0;
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285 }
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diff changeset
286
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diff changeset
287 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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288 {
961
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diff changeset
289 int channels_mode, prediv, dmaclock;
644
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diff changeset
290 void *buffer;
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diff changeset
291
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diff changeset
292 /* Stop currently playing sound */
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293 Buffoper(0);
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diff changeset
294
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diff changeset
295 /* Set replay tracks */
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296 Settracks(0,0);
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diff changeset
297 Setmontracks(0);
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298
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299 /* Select replay format */
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300 channels_mode=STEREO16;
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301 switch (spec->format & 0xff) {
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302 case 8:
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303 if (spec->channels==2) {
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304 channels_mode=STEREO8;
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305 } else {
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306 channels_mode=MONO8;
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307 }
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308 break;
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309 }
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310 if (Setmode(channels_mode)<0) {
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311 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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312 }
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313
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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314 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
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315 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
644
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316 switch(cookie_mcsn->play) {
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317 case MCSN_TT:
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318 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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319 Soundcmd(SETPRESCALE, prediv);
644
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320 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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321 break;
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322 case MCSN_FALCON:
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
323 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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324 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
644
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325 break;
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326 }
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327
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328 /* Set buffer */
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329 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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330 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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331 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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332 }
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333
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diff changeset
334 /* Install interrupt */
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335 Jdisint(MFP_DMASOUND);
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336 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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337 Jenabint(MFP_DMASOUND);
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diff changeset
338
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diff changeset
339 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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parents:
diff changeset
340 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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diff changeset
341 }
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diff changeset
342
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diff changeset
343 /* Go */
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344 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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345 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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346 }
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diff changeset
347
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348 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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349 {
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diff changeset
350 /* Lock sound system */
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diff changeset
351 if (Locksnd()!=1) {
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352 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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353 return(-1);
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354 }
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diff changeset
355
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356 SDL_MintAudio_device = this;
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357
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diff changeset
358 /* Check audio capabilities */
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diff changeset
359 if (Mint_CheckAudio(this, spec)==-1) {
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diff changeset
360 return -1;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
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361 }
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parents:
diff changeset
362
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diff changeset
363 SDL_CalculateAudioSpec(spec);
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diff changeset
364
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diff changeset
365 /* Allocate memory for audio buffers in DMA-able RAM */
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parents:
diff changeset
366 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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parents:
diff changeset
367
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
368 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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parents:
diff changeset
369 if (SDL_MintAudio_audiobuf[0]==NULL) {
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diff changeset
370 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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diff changeset
371 return (-1);
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
372 }
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diff changeset
373 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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diff changeset
374 SDL_MintAudio_numbuf=0;
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diff changeset
375 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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376 SDL_MintAudio_audiosize = spec->size;
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parents:
diff changeset
377 SDL_MintAudio_mutex = 0;
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parents:
diff changeset
378
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diff changeset
379 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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parents:
diff changeset
380 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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parents:
diff changeset
381
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
382 /* Setup audio hardware */
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parents:
diff changeset
383 Mint_InitAudio(this, spec);
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parents:
diff changeset
384
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385 return(1); /* We don't use threaded audio */
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diff changeset
386 }