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annotate src/audio/mint/SDL_mintaudio_dma8.c @ 900:c3c8739f7844

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*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Thu, 27 May 2004 22:57:30 +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 DMA 8bits (hardware access)
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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_dma8.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_dma8"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:dma8: "
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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
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69 /*--- Audio driver functions ---*/
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70
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71 static void Mint_CloseAudio(_THIS);
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72 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_LockAudio(_THIS);
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74 static void Mint_UnlockAudio(_THIS);
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75
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76 /* To check/init hardware audio */
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77 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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78 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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79
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80 /*--- Audio driver bootstrap functions ---*/
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81
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82 static int Audio_Available(void)
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83 {
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84 const char *envr = getenv("SDL_AUDIODRIVER");
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85
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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89 return 0;
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90 }
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91
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92 /* Cookie _MCH present ? if not, assume ST machine */
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93 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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94 cookie_mch = MCH_ST;
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95 }
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96
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97 /* Cookie _SND present ? if not, assume ST machine */
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98 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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99 cookie_snd = SND_PSG;
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100 }
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101
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102 /* Check if we have 8 bits audio */
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103 if ((cookie_snd & SND_8BIT)==0) {
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104 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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105 return(0);
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106 }
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107
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108 if ((cookie_mch>>16)>MCH_F30) {
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109 DEBUG_PRINT((DEBUG_NAME "unknown 8 bits audio chip\n"));
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110 return 0;
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111 }
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112
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113 /* Check if audio is lockable */
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114 if ((cookie_mch>>16) == MCH_F30) {
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115 if (Locksnd()!=1) {
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116 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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117 return(0);
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118 }
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119
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120 Unlocksnd();
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121 }
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122
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123 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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124 return(1);
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125 }
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126
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127 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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128 {
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129 free(device->hidden);
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130 free(device);
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131 }
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132
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133 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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134 {
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135 SDL_AudioDevice *this;
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136
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137 /* Initialize all variables that we clean on shutdown */
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138 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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139 if ( this ) {
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140 memset(this, 0, (sizeof *this));
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141 this->hidden = (struct SDL_PrivateAudioData *)
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142 malloc((sizeof *this->hidden));
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143 }
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144 if ( (this == NULL) || (this->hidden == NULL) ) {
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145 SDL_OutOfMemory();
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146 if ( this ) {
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147 free(this);
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148 }
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149 return(0);
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150 }
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151 memset(this->hidden, 0, (sizeof *this->hidden));
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152
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diff changeset
153 /* Set the function pointers */
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154 this->OpenAudio = Mint_OpenAudio;
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155 this->CloseAudio = Mint_CloseAudio;
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diff changeset
156 this->LockAudio = Mint_LockAudio;
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157 this->UnlockAudio = Mint_UnlockAudio;
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158 this->free = Audio_DeleteDevice;
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159
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160 return this;
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161 }
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162
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163 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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164 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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165 Audio_Available, Audio_CreateDevice
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166 };
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167
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168 static void Mint_LockAudio(_THIS)
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169 {
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170 void *oldpile;
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171
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172 /* Stop replay */
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173 oldpile=(void *)Super(0);
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174 DMAAUDIO_IO.control=0;
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175 Super(oldpile);
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176 }
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177
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178 static void Mint_UnlockAudio(_THIS)
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179 {
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180 void *oldpile;
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181
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182 /* Restart replay */
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183 oldpile=(void *)Super(0);
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184 DMAAUDIO_IO.control=3;
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185 Super(oldpile);
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186 }
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187
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188 static void Mint_CloseAudio(_THIS)
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189 {
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190 void *oldpile;
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191
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192 /* Stop replay */
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193 oldpile=(void *)Super(0);
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194 DMAAUDIO_IO.control=0;
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195 Super(oldpile);
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196
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197 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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198
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199 /* Disable interrupt */
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200 Jdisint(MFP_DMASOUND);
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201
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202 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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203
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204 /* Wait if currently playing sound */
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205 while (SDL_MintAudio_mutex != 0) {
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206 }
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207
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208 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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209
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210 /* Clear buffers */
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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 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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217 }
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218
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219 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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220 {
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221 int i, masterprediv;
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222 unsigned long masterclock;
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223
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224 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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225 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
226 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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227 DEBUG_PRINT(("channels=%d, ", spec->channels));
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228 DEBUG_PRINT(("freq=%d\n", spec->freq));
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229
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230 /* Check formats available */
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231 spec->format = AUDIO_S8;
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232
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233 /* Calculate and select the closest frequency */
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234 MINTAUDIO_nfreq=4;
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235 MINTAUDIO_sfreq=0;
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236 masterclock=MASTERCLOCK_STE;
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237 masterprediv=MASTERPREDIV_STE;
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238 switch(cookie_mch>>16) {
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diff changeset
239 /*
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240 case MCH_STE:
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241 masterclock=MASTERCLOCK_STE;
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242 masterprediv=MASTERPREDIV_STE;
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243 break;
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244 */
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245 case MCH_TT:
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246 masterclock=MASTERCLOCK_TT;
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247 masterprediv=MASTERPREDIV_TT;
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248 break;
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diff changeset
249 case MCH_F30:
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250 masterclock=MASTERCLOCK_FALCON1;
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251 masterprediv=MASTERPREDIV_FALCON<<1;
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252 MINTAUDIO_nfreq=3;
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253 MINTAUDIO_sfreq=1;
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254 break;
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diff changeset
255 }
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diff changeset
256 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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257 MINTAUDIO_hardfreq[i]=masterclock/(masterprediv*(1<<i));
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258 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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259 }
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260
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261 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
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262 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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263
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diff changeset
264 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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265 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
266 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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267 DEBUG_PRINT(("channels=%d, ", spec->channels));
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268 DEBUG_PRINT(("freq=%d\n", spec->freq));
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269
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270 return 0;
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271 }
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272
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273 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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274 {
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275 void *oldpile;
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276 unsigned long buffer;
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277 unsigned char mode;
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278
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279 /* Set replay tracks */
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280 if (cookie_snd & SND_16BIT) {
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281 Settracks(0,0);
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282 Setmontracks(0);
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283 }
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284
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285 oldpile=(void *)Super(0);
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286
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diff changeset
287 /* Stop currently playing sound */
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288 DMAAUDIO_IO.control=0;
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289
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diff changeset
290 /* Set buffer */
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291 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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292 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
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293 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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diff changeset
294 DMAAUDIO_IO.start_low = buffer & 255;
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295
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296 buffer += SDL_MintAudio_audiosize;
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297 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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298 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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diff changeset
299 DMAAUDIO_IO.end_low = buffer & 255;
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diff changeset
300
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301 mode = 3-MINTAUDIO_numfreq;
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diff changeset
302 if (spec->channels==1) {
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diff changeset
303 mode |= 1<<7;
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304 }
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305 DMAAUDIO_IO.mode = mode;
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306
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307 /* Set interrupt */
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308 Jdisint(MFP_DMASOUND);
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309 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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310 Jenabint(MFP_DMASOUND);
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311
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312 /* Go */
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313 DMAAUDIO_IO.control = 3; /* playback + repeat */
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314
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315 Super(oldpile);
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316 }
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317
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318 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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319 {
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320 SDL_MintAudio_device = this;
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321
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322 /* Check audio capabilities */
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323 if (Mint_CheckAudio(this, spec)==-1) {
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324 return -1;
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325 }
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326
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327 SDL_CalculateAudioSpec(spec);
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328
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329 /* Allocate memory for audio buffers in DMA-able RAM */
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330 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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331
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332 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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333 if (SDL_MintAudio_audiobuf[0]==NULL) {
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334 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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335 return (-1);
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336 }
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337 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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338 SDL_MintAudio_numbuf=0;
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339 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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340 SDL_MintAudio_audiosize = spec->size;
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341 SDL_MintAudio_mutex = 0;
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342
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343 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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344 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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345
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346 /* Setup audio hardware */
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347 Mint_InitAudio(this, spec);
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348
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349 return(1); /* We don't use threaded audio */
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350 }