Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_xbios.c @ 854:59a93320f326

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*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Feb 2004 16:21:19 +0000
parents b8d311d90021
children 185acc07127a
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
644
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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 (Falcon)
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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
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49 /*--- Defines ---*/
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50
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51 #define MINT_AUDIO_DRIVER_NAME "mint_xbios"
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52
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53 /* Debug print info */
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54 #define DEBUG_NAME "audio:xbios: "
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55 #if 0
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56 #define DEBUG_PRINT(what) \
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57 { \
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58 printf what; \
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59 }
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60 #else
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61 #define DEBUG_PRINT(what)
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62 #endif
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63
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64 /*--- Static variables ---*/
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65
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66 static unsigned long cookie_snd;
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67
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68 /*--- Audio driver functions ---*/
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69
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70 static void Mint_CloseAudio(_THIS);
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71 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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72 static void Mint_LockAudio(_THIS);
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73 static void Mint_UnlockAudio(_THIS);
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74
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75 /* To check/init hardware audio */
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76 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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77 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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78
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79 /*--- Audio driver bootstrap functions ---*/
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80
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81 static int Audio_Available(void)
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82 {
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83 const char *envr = getenv("SDL_AUDIODRIVER");
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84
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85 /* Check if user asked a different audio driver */
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86 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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87 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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88 return(0);
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89 }
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90
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91 /* Cookie _SND present ? if not, assume ST machine */
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92 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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93 cookie_snd = SND_PSG;
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94 }
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95
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96 /* Check if we have 16 bits audio */
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97 if ((cookie_snd & SND_16BIT)==0) {
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98 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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99 return(0);
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100 }
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101
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102 /* Check if audio is lockable */
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103 if (Locksnd()!=1) {
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104 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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105 return(0);
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106 }
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107
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108 Unlocksnd();
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109
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110 DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
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111 return(1);
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112 }
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113
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114 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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115 {
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116 free(device->hidden);
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117 free(device);
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118 }
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119
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120 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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121 {
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122 SDL_AudioDevice *this;
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123
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124 /* Initialize all variables that we clean on shutdown */
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125 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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126 if ( this ) {
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127 memset(this, 0, (sizeof *this));
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128 this->hidden = (struct SDL_PrivateAudioData *)
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129 malloc((sizeof *this->hidden));
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130 }
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131 if ( (this == NULL) || (this->hidden == NULL) ) {
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132 SDL_OutOfMemory();
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133 if ( this ) {
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134 free(this);
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135 }
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136 return(0);
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137 }
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138 memset(this->hidden, 0, (sizeof *this->hidden));
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139
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140 /* Set the function pointers */
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141 this->OpenAudio = Mint_OpenAudio;
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142 this->CloseAudio = Mint_CloseAudio;
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143 this->LockAudio = Mint_LockAudio;
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144 this->UnlockAudio = Mint_UnlockAudio;
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145 this->free = Audio_DeleteDevice;
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146
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147 return this;
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148 }
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149
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150 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
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151 MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
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152 Audio_Available, Audio_CreateDevice
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153 };
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154
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155 static void Mint_LockAudio(_THIS)
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156 {
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157 /* Stop replay */
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158 Buffoper(0);
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159 }
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160
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161 static void Mint_UnlockAudio(_THIS)
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162 {
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163 /* Restart replay */
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164 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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165 }
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166
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167 static void Mint_CloseAudio(_THIS)
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168 {
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169 /* Stop replay */
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170 Buffoper(0);
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171
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172 /* Uninstall interrupt */
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173 Jdisint(MFP_DMASOUND);
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174
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175 /* Wait if currently playing sound */
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176 while (SDL_MintAudio_mutex != 0) {
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177 }
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178
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179 /* Clear buffers */
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180 if (SDL_MintAudio_audiobuf[0]) {
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181 Mfree(SDL_MintAudio_audiobuf[0]);
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182 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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183 }
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184
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185 /* Unlock sound system */
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186 Unlocksnd();
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187 }
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188
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189 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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190 {
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191 int i;
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192
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193 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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194 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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195 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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196 DEBUG_PRINT(("channels=%d, ", spec->channels));
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197 DEBUG_PRINT(("freq=%d\n", spec->freq));
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198
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199 spec->format |= 0x8000; /* Audio is always signed */
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200 if ((spec->format & 0x00ff)==16) {
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201 spec->format |= 0x1000; /* Audio is always big endian */
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202 spec->channels=2; /* 16 bits always stereo */
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203 }
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204
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205 /* FIXME: check for an external clock */
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206 MINTAUDIO_sfreq=1;
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207 MINTAUDIO_nfreq=12;
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208 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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209 MINTAUDIO_hardfreq[i]=MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1));
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210 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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211 }
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212
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213 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq);
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214 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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215
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216 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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217 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
218 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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219 DEBUG_PRINT(("channels=%d, ", spec->channels));
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220 DEBUG_PRINT(("freq=%d\n", spec->freq));
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221
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222 return 0;
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223 }
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224
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225 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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226 {
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227 int channels_mode;
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228 void *buffer;
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229
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230 /* Stop currently playing sound */
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231 Buffoper(0);
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232
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233 /* Set replay tracks */
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234 Settracks(0,0);
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235 Setmontracks(0);
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236
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diff changeset
237 /* Select replay format */
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238 channels_mode=STEREO16;
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239 switch (spec->format & 0xff) {
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diff changeset
240 case 8:
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diff changeset
241 if (spec->channels==2) {
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242 channels_mode=STEREO8;
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243 } else {
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244 channels_mode=MONO8;
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245 }
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246 break;
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247 }
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248 if (Setmode(channels_mode)<0) {
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249 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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250 }
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251
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252 /* FIXME: select an external clock */
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253
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254 Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
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255 DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
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256
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diff changeset
257 /* Set buffer */
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258 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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259 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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260 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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261 }
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262
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diff changeset
263 /* Install interrupt */
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264 Jdisint(MFP_DMASOUND);
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265 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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266 Jenabint(MFP_DMASOUND);
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267
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268 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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269 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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270 }
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271
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diff changeset
272 /* Go */
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273 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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274 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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275 }
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276
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277 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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278 {
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diff changeset
279 /* Lock sound system */
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280 if (Locksnd()!=1) {
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281 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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282 return(-1);
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283 }
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284
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285 SDL_MintAudio_device = this;
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286
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diff changeset
287 /* Check audio capabilities */
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288 if (Mint_CheckAudio(this, spec)==-1) {
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289 return -1;
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290 }
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291
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292 SDL_CalculateAudioSpec(spec);
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diff changeset
293
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294 /* Allocate memory for audio buffers in DMA-able RAM */
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295 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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296
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297 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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diff changeset
298 if (SDL_MintAudio_audiobuf[0]==NULL) {
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299 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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300 return (-1);
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diff changeset
301 }
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302 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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303 SDL_MintAudio_numbuf=0;
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304 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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305 SDL_MintAudio_audiosize = spec->size;
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306 SDL_MintAudio_mutex = 0;
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307
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308 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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309 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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310
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311 /* Setup audio hardware */
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312 Mint_InitAudio(this, spec);
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313
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314 return(1); /* We don't use threaded audio */
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315 }