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annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 1273:05d5d36b71f4

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Who'd have thought that Windows CE wouldn't have the environment APIs?
author Sam Lantinga <slouken@libsdl.org>
date Thu, 26 Jan 2006 08:45:51 +0000
parents 12c49532be00
children 3692456e7b0f
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!)
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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 #include <support.h>
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34
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35 /* Mint includes */
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36 #include <mint/osbind.h>
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37 #include <mint/falcon.h>
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38 #include <mint/cookie.h>
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39
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40 #include "SDL_endian.h"
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41 #include "SDL_audio.h"
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42 #include "SDL_audio_c.h"
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43 #include "SDL_audiomem.h"
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44 #include "SDL_sysaudio.h"
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45
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46 #include "SDL_atarimxalloc_c.h"
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47
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48 #include "SDL_mintaudio.h"
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49 #include "SDL_mintaudio_mcsn.h"
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50
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51 /*--- Defines ---*/
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52
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53 #define MINT_AUDIO_DRIVER_NAME "mint_mcsn"
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54
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55 /* Debug print info */
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56 #define DEBUG_NAME "audio:mcsn: "
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57 #if 0
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58 #define DEBUG_PRINT(what) \
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59 { \
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60 printf what; \
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61 }
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62 #else
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63 #define DEBUG_PRINT(what)
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64 #endif
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65
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66 /*--- Static variables ---*/
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67
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68 static unsigned long cookie_snd, cookie_mch;
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69 static cookie_mcsn_t *cookie_mcsn;
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70
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71 /*--- Audio driver functions ---*/
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72
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73 static void Mint_CloseAudio(_THIS);
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74 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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75 static void Mint_LockAudio(_THIS);
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76 static void Mint_UnlockAudio(_THIS);
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77
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78 /* To check/init hardware audio */
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79 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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80 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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81
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82 /*--- Audio driver bootstrap functions ---*/
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83
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84 static int Audio_Available(void)
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85 {
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86 unsigned long dummy;
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87 const char *envr = getenv("SDL_AUDIODRIVER");
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88
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89 SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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90
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91 /* We can't use XBIOS in interrupt with Magic, don't know about thread */
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92 if (Getcookie(C_MagX, &dummy) == C_FOUND) {
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93 return(0);
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94 }
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95
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96 /* Check if user asked a different audio driver */
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97 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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98 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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99 return(0);
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100 }
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101
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102 /* Cookie _MCH present ? if not, assume ST machine */
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103 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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104 cookie_mch = MCH_ST;
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105 }
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106
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107 /* Cookie _SND present ? if not, assume ST machine */
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108 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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109 cookie_snd = SND_PSG;
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110 }
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111
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112 /* Check if we have 16 bits audio */
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113 if ((cookie_snd & SND_16BIT)==0) {
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114 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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115 return(0);
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116 }
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117
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118 /* Cookie MCSN present ? */
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119 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
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120 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
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121 return(0);
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122 }
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123
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124 /* Check if interrupt at end of replay */
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125 if (cookie_mcsn->pint == 0) {
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126 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
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127 return(0);
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128 }
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129
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130 /* Check if audio is lockable */
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131 if (Locksnd()!=1) {
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132 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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133 return(0);
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134 }
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135
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136 Unlocksnd();
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137
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138 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
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139 return(1);
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140 }
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141
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142 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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143 {
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144 free(device->hidden);
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145 free(device);
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146 }
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147
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148 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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149 {
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150 SDL_AudioDevice *this;
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151
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152 /* Initialize all variables that we clean on shutdown */
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153 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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154 if ( this ) {
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155 memset(this, 0, (sizeof *this));
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diff changeset
156 this->hidden = (struct SDL_PrivateAudioData *)
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157 malloc((sizeof *this->hidden));
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158 }
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diff changeset
159 if ( (this == NULL) || (this->hidden == NULL) ) {
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diff changeset
160 SDL_OutOfMemory();
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161 if ( this ) {
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162 free(this);
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163 }
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164 return(0);
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165 }
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diff changeset
166 memset(this->hidden, 0, (sizeof *this->hidden));
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167
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168 /* Set the function pointers */
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169 this->OpenAudio = Mint_OpenAudio;
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170 this->CloseAudio = Mint_CloseAudio;
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171 this->LockAudio = Mint_LockAudio;
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172 this->UnlockAudio = Mint_UnlockAudio;
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173 this->free = Audio_DeleteDevice;
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174
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175 return this;
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176 }
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177
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178 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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179 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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180 Audio_Available, Audio_CreateDevice
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181 };
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182
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183 static void 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 Mint_UnlockAudio(_THIS)
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190 {
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191 /* Restart replay */
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192 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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193 }
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194
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195 static void Mint_CloseAudio(_THIS)
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196 {
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197 /* Stop replay */
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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198 SDL_MintAudio_WaitThread();
644
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199 Buffoper(0);
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200
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
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diff changeset
201 if (!SDL_MintAudio_mint_present) {
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202 /* Uninstall interrupt */
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203 Jdisint(MFP_DMASOUND);
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diff changeset
204 }
644
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205
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206 /* Wait if currently playing sound */
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207 while (SDL_MintAudio_mutex != 0) {
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208 }
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209
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diff changeset
210 /* Clear buffers */
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diff changeset
211 if (SDL_MintAudio_audiobuf[0]) {
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212 Mfree(SDL_MintAudio_audiobuf[0]);
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213 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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214 }
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215
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216 /* Unlock sound system */
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217 Unlocksnd();
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218 }
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219
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220 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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221 {
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222 int i;
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223 unsigned long masterclock, masterprediv;
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224
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225 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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226 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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c4803992e09c Small bugfixes
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diff changeset
227 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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228 DEBUG_PRINT(("channels=%d, ", spec->channels));
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229 DEBUG_PRINT(("freq=%d\n", spec->freq));
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230
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diff changeset
231 /* Check formats available */
961
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232 MINTAUDIO_freqcount=0;
644
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diff changeset
233 switch(cookie_mcsn->play) {
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diff changeset
234 case MCSN_ST:
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235 spec->channels=1;
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diff changeset
236 spec->format=8; /* FIXME: is it signed or unsigned ? */
1107
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diff changeset
237 SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
644
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diff changeset
238 break;
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diff changeset
239 case MCSN_TT: /* Also STE, Mega STE */
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diff changeset
240 spec->format=AUDIO_S8;
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diff changeset
241 masterclock=MASTERCLOCK_STE;
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diff changeset
242 masterprediv=MASTERPREDIV_STE;
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diff changeset
243 if ((cookie_mch>>16)==MCH_TT) {
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diff changeset
244 masterclock=MASTERCLOCK_TT;
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245 masterprediv=MASTERPREDIV_TT;
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diff changeset
246 }
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
247 for (i=0; i<4; i++) {
1107
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diff changeset
248 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
249 masterclock, 3-i, -1);
644
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diff changeset
250 }
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diff changeset
251 break;
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diff changeset
252 case MCSN_FALCON: /* Also Mac */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
253 for (i=1; i<12; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
254 /* Remove unusable Falcon codec predivisors */
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diff changeset
255 if ((i==6) || (i==8) || (i==10)) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
256 continue;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
257 }
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
258 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
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diff changeset
259 CLK25M, i+1, -1);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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260 }
644
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diff changeset
261 if (cookie_mcsn->res1 != 0) {
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185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
262 for (i=1; i<4; i++) {
1107
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diff changeset
263 SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
264 CLKEXT, (1<<i)-1, -1);
961
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diff changeset
265 }
644
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diff changeset
266 }
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diff changeset
267 spec->format |= 0x8000; /* Audio is always signed */
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diff changeset
268 if ((spec->format & 0x00ff)==16) {
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diff changeset
269 spec->format |= 0x1000; /* Audio is always big endian */
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diff changeset
270 spec->channels=2; /* 16 bits always stereo */
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diff changeset
271 }
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diff changeset
272 break;
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diff changeset
273 }
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parents:
diff changeset
274
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
275 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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276 for (i=0; i<MINTAUDIO_freqcount; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
277 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
278 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
279 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
280 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
281 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
282 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
283
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
284 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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parents:
diff changeset
286
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diff changeset
287 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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diff changeset
288 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
289 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
290 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
291 DEBUG_PRINT(("freq=%d\n", spec->freq));
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parents:
diff changeset
292
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diff changeset
293 return 0;
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parents:
diff changeset
294 }
594422ab8f9f Atari MiNT: added more audio drivers
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295
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296 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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297 {
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298 int channels_mode, prediv, dmaclock;
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299 void *buffer;
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300
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301 /* Stop currently playing sound */
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302 SDL_MintAudio_quit_thread = SDL_FALSE;
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303 SDL_MintAudio_thread_finished = SDL_TRUE;
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304 SDL_MintAudio_WaitThread();
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305 Buffoper(0);
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306
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307 /* Set replay tracks */
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308 Settracks(0,0);
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309 Setmontracks(0);
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310
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311 /* Select replay format */
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312 channels_mode=STEREO16;
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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 }
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322 if (Setmode(channels_mode)<0) {
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323 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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324 }
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325
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326 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
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327 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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328 switch(cookie_mcsn->play) {
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329 case MCSN_TT:
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330 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
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331 Soundcmd(SETPRESCALE, prediv);
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332 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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333 break;
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334 case MCSN_FALCON:
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335 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
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336 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
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337 break;
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338 }
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339
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340 /* Set buffer */
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341 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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342 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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343 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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344 }
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345
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346 if (SDL_MintAudio_mint_present) {
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347 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
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348 } else {
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349 /* Install interrupt */
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350 Jdisint(MFP_DMASOUND);
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351 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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352 Jenabint(MFP_DMASOUND);
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353
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354 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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355 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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356 }
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357 }
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358
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359 /* Go */
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360 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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361 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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362 }
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363
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364 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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365 {
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366 /* Lock sound system */
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367 if (Locksnd()!=1) {
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368 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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369 return(-1);
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370 }
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371
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372 SDL_MintAudio_device = this;
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373
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374 /* Check audio capabilities */
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375 if (Mint_CheckAudio(this, spec)==-1) {
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376 return -1;
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377 }
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378
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379 SDL_CalculateAudioSpec(spec);
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380
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381 /* Allocate memory for audio buffers in DMA-able RAM */
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382 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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383
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384 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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385 if (SDL_MintAudio_audiobuf[0]==NULL) {
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386 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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387 return (-1);
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388 }
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389 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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390 SDL_MintAudio_numbuf=0;
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391 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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392 SDL_MintAudio_audiosize = spec->size;
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393 SDL_MintAudio_mutex = 0;
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394
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395 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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396 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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397
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398 /* Setup audio hardware */
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399 Mint_InitAudio(this, spec);
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400
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401 return(1); /* We don't use SDL threaded audio */
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402 }