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annotate src/audio/mint/SDL_mintaudio_dma8.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents a8181c4040b8
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 MiNT audio driver
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26 using DMA 8bits (hardware access)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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32 #include <mint/osbind.h>
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33 #include <mint/falcon.h>
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34 #include <mint/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_dma8.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:dma8: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_mch;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 static void Mint_CloseAudio (_THIS);
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67 static int Mint_OpenAudio (_THIS, SDL_AudioSpec * spec);
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68 static void Mint_LockAudio (_THIS);
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69 static void Mint_UnlockAudio (_THIS);
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70
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71 /* To check/init hardware audio */
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72 static int Mint_CheckAudio (_THIS, SDL_AudioSpec * spec);
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73 static void Mint_InitAudio (_THIS, SDL_AudioSpec * spec);
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74
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75 /*--- Audio driver bootstrap functions ---*/
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76
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77 static int
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78 Audio_Available (void)
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79 {
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80 const char *envr = SDL_getenv ("SDL_AUDIODRIVER");
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81
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82 /* Check if user asked a different audio driver */
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83 if ((envr) && (SDL_strcmp (envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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84 DEBUG_PRINT ((DEBUG_NAME "user asked a different audio driver\n"));
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85 return 0;
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86 }
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88 /* Cookie _MCH present ? if not, assume ST machine */
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89 if (Getcookie (C__MCH, &cookie_mch) == C_NOTFOUND) {
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90 cookie_mch = MCH_ST;
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91 }
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93 /* Cookie _SND present ? if not, assume ST machine */
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94 if (Getcookie (C__SND, &cookie_snd) == C_NOTFOUND) {
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95 cookie_snd = SND_PSG;
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96 }
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97
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98 /* Check if we have 8 bits audio */
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99 if ((cookie_snd & SND_8BIT) == 0) {
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100 DEBUG_PRINT ((DEBUG_NAME "no 8 bits sound\n"));
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101 return (0);
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102 }
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104 /* Check if audio is lockable */
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105 if (cookie_snd & SND_16BIT) {
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106 if (Locksnd () != 1) {
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107 DEBUG_PRINT ((DEBUG_NAME "audio locked by other application\n"));
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108 return (0);
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109 }
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111 Unlocksnd ();
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112 }
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114 DEBUG_PRINT ((DEBUG_NAME "8 bits audio available!\n"));
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115 return (1);
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116 }
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117
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118 static void
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119 Audio_DeleteDevice (SDL_AudioDevice * device)
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120 {
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121 SDL_free (device->hidden);
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122 SDL_free (device);
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123 }
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124
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125 static SDL_AudioDevice *
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126 Audio_CreateDevice (int devindex)
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127 {
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128 SDL_AudioDevice *this;
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129
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130 /* Initialize all variables that we clean on shutdown */
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131 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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132 if (this) {
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133 SDL_memset (this, 0, (sizeof *this));
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134 this->hidden = (struct SDL_PrivateAudioData *)
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135 SDL_malloc ((sizeof *this->hidden));
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136 }
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137 if ((this == NULL) || (this->hidden == NULL)) {
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138 SDL_OutOfMemory ();
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139 if (this) {
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140 SDL_free (this);
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141 }
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142 return (0);
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143 }
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144 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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145
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146 /* Set the function pointers */
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147 this->OpenAudio = Mint_OpenAudio;
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148 this->CloseAudio = Mint_CloseAudio;
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149 this->LockAudio = Mint_LockAudio;
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150 this->UnlockAudio = Mint_UnlockAudio;
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151 this->free = Audio_DeleteDevice;
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152
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153 return this;
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154 }
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155
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156 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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157 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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158 Audio_Available, Audio_CreateDevice
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159 };
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160
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161 static void
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162 Mint_LockAudio (_THIS)
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163 {
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164 void *oldpile;
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165
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166 /* Stop replay */
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167 oldpile = (void *) Super (0);
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168 DMAAUDIO_IO.control = 0;
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169 Super (oldpile);
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170 }
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171
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172 static void
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173 Mint_UnlockAudio (_THIS)
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174 {
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175 void *oldpile;
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176
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177 /* Restart replay */
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178 oldpile = (void *) Super (0);
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179 DMAAUDIO_IO.control = 3;
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180 Super (oldpile);
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181 }
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182
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183 static void
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184 Mint_CloseAudio (_THIS)
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185 {
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186 void *oldpile;
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187
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188 /* Stop replay */
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189 oldpile = (void *) Super (0);
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190 DMAAUDIO_IO.control = 0;
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191 Super (oldpile);
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192
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193 DEBUG_PRINT ((DEBUG_NAME "closeaudio: replay stopped\n"));
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194
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195 /* Disable interrupt */
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196 Jdisint (MFP_DMASOUND);
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197
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198 DEBUG_PRINT ((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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199
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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 DEBUG_PRINT ((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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205
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206 /* Clear buffers */
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207 if (SDL_MintAudio_audiobuf[0]) {
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208 Mfree (SDL_MintAudio_audiobuf[0]);
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209 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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210 }
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211
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212 DEBUG_PRINT ((DEBUG_NAME "closeaudio: buffers freed\n"));
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213 }
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214
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215 static int
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216 Mint_CheckAudio (_THIS, SDL_AudioSpec * spec)
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217 {
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218 int i, masterprediv, sfreq;
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219 unsigned long masterclock;
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220
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221 DEBUG_PRINT ((DEBUG_NAME "asked: %d bits, ", spec->format & 0x00ff));
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222 DEBUG_PRINT (("signed=%d, ", ((spec->format & 0x8000) != 0)));
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223 DEBUG_PRINT (("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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224 DEBUG_PRINT (("channels=%d, ", spec->channels));
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225 DEBUG_PRINT (("freq=%d\n", spec->freq));
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226
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227 /* Check formats available */
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228 spec->format = AUDIO_S8;
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229
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230 /* Calculate and select the closest frequency */
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231 sfreq = 0;
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232 masterclock = MASTERCLOCK_STE;
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233 masterprediv = MASTERPREDIV_STE;
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234 switch (cookie_mch >> 16) {
644
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235 /*
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236 case MCH_STE:
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237 masterclock=MASTERCLOCK_STE;
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238 masterprediv=MASTERPREDIV_STE;
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239 break;
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240 */
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241 case MCH_TT:
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242 masterclock = MASTERCLOCK_TT;
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243 masterprediv = MASTERPREDIV_TT;
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244 break;
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245 case MCH_F30:
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246 case MCH_ARANYM:
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247 masterclock = MASTERCLOCK_FALCON1;
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248 masterprediv = MASTERPREDIV_FALCON;
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249 sfreq = 1;
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250 break;
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251 }
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252
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253 MINTAUDIO_freqcount = 0;
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254 for (i = sfreq; i < 4; i++) {
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255 SDL_MintAudio_AddFrequency (this,
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256 masterclock / (masterprediv * (1 << i)),
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257 masterclock, i - sfreq, -1);
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258 }
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259
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260 #if 1
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261 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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262 DEBUG_PRINT ((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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263 i, MINTAUDIO_frequencies[i].frequency,
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264 MINTAUDIO_frequencies[i].masterclock,
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265 MINTAUDIO_frequencies[i].predivisor));
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266 }
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267 #endif
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268
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269 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency (this, spec->freq);
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270 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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271
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272 DEBUG_PRINT ((DEBUG_NAME "obtained: %d bits, ", spec->format & 0x00ff));
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273 DEBUG_PRINT (("signed=%d, ", ((spec->format & 0x8000) != 0)));
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274 DEBUG_PRINT (("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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275 DEBUG_PRINT (("channels=%d, ", spec->channels));
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276 DEBUG_PRINT (("freq=%d\n", spec->freq));
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277
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278 return 0;
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279 }
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280
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281 static void
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282 Mint_InitAudio (_THIS, SDL_AudioSpec * spec)
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283 {
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284 void *oldpile;
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285 unsigned long buffer;
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286 unsigned char mode;
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287
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288 /* Set replay tracks */
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289 if (cookie_snd & SND_16BIT) {
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290 Settracks (0, 0);
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291 Setmontracks (0);
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292 }
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293
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294 oldpile = (void *) Super (0);
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295
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296 /* Stop currently playing sound */
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297 DMAAUDIO_IO.control = 0;
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298
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299 /* Set buffer */
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300 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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301 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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302 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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303 DMAAUDIO_IO.start_low = buffer & 255;
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304
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305 buffer += SDL_MintAudio_audiosize;
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306 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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307 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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308 DMAAUDIO_IO.end_low = buffer & 255;
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309
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310 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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311 if (spec->channels == 1) {
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312 mode |= 1 << 7;
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313 }
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314 DMAAUDIO_IO.sound_ctrl = mode;
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315
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316 /* Set interrupt */
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317 Jdisint (MFP_DMASOUND);
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318 Xbtimer (XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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319 Jenabint (MFP_DMASOUND);
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320
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321 if (cookie_snd & SND_16BIT) {
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322 if (Setinterrupt (SI_TIMERA, SI_PLAY) < 0) {
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323 DEBUG_PRINT ((DEBUG_NAME "Setinterrupt() failed\n"));
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324 }
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325 }
1098
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326
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327 /* Go */
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328 DMAAUDIO_IO.control = 3; /* playback + repeat */
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329
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330 Super (oldpile);
644
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331 }
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332
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333 static int
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334 Mint_OpenAudio (_THIS, SDL_AudioSpec * spec)
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335 {
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336 SDL_MintAudio_device = this;
644
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337
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338 /* Check audio capabilities */
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339 if (Mint_CheckAudio (this, spec) == -1) {
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340 return -1;
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341 }
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342
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343 SDL_CalculateAudioSpec (spec);
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344
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345 /* Allocate memory for audio buffers in DMA-able RAM */
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346 DEBUG_PRINT ((DEBUG_NAME "buffer size=%d\n", spec->size));
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347
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348 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc (spec->size * 2, MX_STRAM);
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349 if (SDL_MintAudio_audiobuf[0] == NULL) {
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350 SDL_SetError ("MINT_OpenAudio: Not enough memory for audio buffer");
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351 return (-1);
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352 }
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353 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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354 SDL_MintAudio_numbuf = 0;
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355 SDL_memset (SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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356 SDL_MintAudio_audiosize = spec->size;
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357 SDL_MintAudio_mutex = 0;
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358
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359 DEBUG_PRINT ((DEBUG_NAME "buffer 0 at 0x%08x\n",
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360 SDL_MintAudio_audiobuf[0]));
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361 DEBUG_PRINT ((DEBUG_NAME "buffer 1 at 0x%08x\n",
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362 SDL_MintAudio_audiobuf[1]));
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363
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364 /* Setup audio hardware */
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365 Mint_InitAudio (this, spec);
644
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366
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367 return (1); /* We don't use threaded audio */
644
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368 }
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369
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370 /* vi: set ts=4 sw=4 expandtab: */