Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 3844:332a59e39ce1 SDL-ryan-multiple-audio-device

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I really don't want to update these last two audio backends...I added an error that says if no one complains, the backends will be removed eventually. So if anyone ever wants them and they care enough to speak up, we'll know to do something about it. If no one does, that's less code to maintain. :)
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:45:17 +0000
parents 1f156fd874fa
children 66fb40445587
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
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65 static int
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66 MINTDMA8_Available(void)
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67 {
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68 /* Cookie _MCH present ? if not, assume ST machine */
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69 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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70 cookie_mch = MCH_ST;
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71 }
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72
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73 /* Cookie _SND present ? if not, assume ST machine */
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74 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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75 cookie_snd = SND_PSG;
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76 }
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77
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78 /* Check if we have 8 bits audio */
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79 if ((cookie_snd & SND_8BIT) == 0) {
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80 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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81 return (0);
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82 }
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83
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84 /* Check if audio is lockable */
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85 if (cookie_snd & SND_16BIT) {
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86 if (Locksnd() != 1) {
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87 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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88 return (0);
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89 }
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90
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91 Unlocksnd();
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92 }
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93
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94 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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95 return (1);
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96 }
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97
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98 static void
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99 MINTDMA8_LockDevice(_THIS)
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100 {
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101 void *oldpile;
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102
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103 /* Stop replay */
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104 oldpile = (void *) Super(0);
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105 DMAAUDIO_IO.control = 0;
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106 Super(oldpile);
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107 }
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108
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109 static void
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110 MINTDMA8_UnlockDevice(_THIS)
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111 {
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112 void *oldpile;
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113
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114 /* Restart replay */
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115 oldpile = (void *) Super(0);
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116 DMAAUDIO_IO.control = 3;
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117 Super(oldpile);
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118 }
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119
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120 static void
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121 MINTDMA8_CloseDevice(_THIS)
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122 {
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123 if (this->hidden != NULL) {
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124 /* Stop replay */
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125 void *oldpile = (void *) Super(0);
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126
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127 DMAAUDIO_IO.control = 0;
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128 Super(oldpile);
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129
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130 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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132 /* Disable interrupt */
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133 Jdisint(MFP_DMASOUND);
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134
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135 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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136
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137 /* Wait if currently playing sound */
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138 while (SDL_MintAudio_mutex != 0) {}
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139
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140 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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141
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142 /* Clear buffers */
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143 if (SDL_MintAudio_audiobuf[0]) {
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144 Mfree(SDL_MintAudio_audiobuf[0]);
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145 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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146 }
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147
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148 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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149 SDL_free(this->buffer);
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150 this->buffer = NULL;
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151 }
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152 }
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153
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154 static int
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155 MINTDMA8_CheckAudio(_THIS)
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156 {
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157 int i, masterprediv, sfreq;
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158 unsigned long masterclock;
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159
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160 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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161 SDL_AUDIO_BITSIZE(this->spec.format)));
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162 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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163 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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164 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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165 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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166 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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167
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168 if (this->spec.channels > 2) {
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169 this->spec.channels = 2; /* no more than stereo! */
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170 }
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171
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172 /* Check formats available */
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173 this->spec.format = AUDIO_S8;
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174
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175 /* Calculate and select the closest frequency */
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176 sfreq = 0;
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177 masterclock = MASTERCLOCK_STE;
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178 masterprediv = MASTERPREDIV_STE;
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179 switch (cookie_mch >> 16) {
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180 /*
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181 case MCH_STE:
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182 masterclock=MASTERCLOCK_STE;
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183 masterprediv=MASTERPREDIV_STE;
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184 break;
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185 */
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186 case MCH_TT:
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187 masterclock = MASTERCLOCK_TT;
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188 masterprediv = MASTERPREDIV_TT;
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189 break;
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190 case MCH_F30:
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191 case MCH_ARANYM:
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192 masterclock = MASTERCLOCK_FALCON1;
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193 masterprediv = MASTERPREDIV_FALCON;
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194 sfreq = 1;
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195 break;
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196 }
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197
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198 MINTAUDIO_freqcount = 0;
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199 for (i = sfreq; i < 4; i++) {
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200 SDL_MintAudio_AddFrequency(this,
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201 masterclock / (masterprediv * (1 << i)),
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202 masterclock, i - sfreq, -1);
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203 }
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204
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205 #if 1
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206 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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207 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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208 i, MINTAUDIO_frequencies[i].frequency,
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209 MINTAUDIO_frequencies[i].masterclock,
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210 MINTAUDIO_frequencies[i].predivisor));
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211 }
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212 #endif
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213
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214 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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215 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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216
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217 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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218 SDL_AUDIO_BITSIZE(this->spec.format)));
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219 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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220 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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221 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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222 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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223 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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224
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225 return 0;
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226 }
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227
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228 static void
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229 MINTDMA8_InitAudio(_THIS)
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230 {
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231 void *oldpile;
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232 unsigned long buffer;
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233 unsigned char mode;
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234
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235 /* Set replay tracks */
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236 if (cookie_snd & SND_16BIT) {
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237 Settracks(0, 0);
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238 Setmontracks(0);
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239 }
644
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240
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241 oldpile = (void *) Super(0);
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242
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243 /* Stop currently playing sound */
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244 DMAAUDIO_IO.control = 0;
644
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245
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246 /* Set buffer */
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247 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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248 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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249 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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250 DMAAUDIO_IO.start_low = buffer & 255;
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251
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252 buffer += SDL_MintAudio_audiosize;
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253 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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254 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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255 DMAAUDIO_IO.end_low = buffer & 255;
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256
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257 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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258 if (this->spec.channels == 1) {
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259 mode |= 1 << 7;
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260 }
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261 DMAAUDIO_IO.sound_ctrl = mode;
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262
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263 /* Set interrupt */
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264 Jdisint(MFP_DMASOUND);
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265 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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266 Jenabint(MFP_DMASOUND);
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267
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268 if (cookie_snd & SND_16BIT) {
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269 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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270 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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271 }
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272 }
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273
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274 /* Go */
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275 DMAAUDIO_IO.control = 3; /* playback + repeat */
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276
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277 Super(oldpile);
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278 }
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279
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280 static int
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281 MINTDMA8_OpenDevice(_THIS, const char *devname, int iscapture)
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282 {
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283 SDL_MintAudio_device = this;
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284
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285 /* Check audio capabilities */
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286 if (MINTDMA8_CheckAudio(this) == -1) {
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287 return 0;
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288 }
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289
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290 /* Initialize all variables that we clean on shutdown */
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291 this->hidden = (struct SDL_PrivateAudioData *)
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292 SDL_malloc((sizeof *this->hidden));
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293 if (this->hidden == NULL) {
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294 SDL_OutOfMemory();
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295 return 0;
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296 }
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297 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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298
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299 SDL_CalculateAudioSpec(&this->spec);
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300
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301 /* Allocate memory for audio buffers in DMA-able RAM */
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302 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
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303
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304 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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305 if (SDL_MintAudio_audiobuf[0] == NULL) {
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306 SDL_free(this->hidden);
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307 this->hidden = NULL;
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308 SDL_OutOfMemory();
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309 return 0;
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310 }
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311 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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312 SDL_MintAudio_numbuf = 0;
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313 SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2);
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314 SDL_MintAudio_audiosize = this->spec.size;
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315 SDL_MintAudio_mutex = 0;
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316
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317 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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318 SDL_MintAudio_audiobuf[0]));
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319 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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320 SDL_MintAudio_audiobuf[1]));
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321
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322 SDL_MintAudio_CheckFpu();
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323
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324 /* Setup audio hardware */
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325 MINTDMA8_InitAudio(this);
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326
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327 return 1; /* good to go. */
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328 }
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329
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330 static int
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331 MINTDMA8_Init(SDL_AudioDriverImpl *impl)
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332 {
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333 /* Set the function pointers */
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334 impl->OpenDevice = MINTDMA8_OpenDevice;
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335 impl->CloseDevice = MINTDMA8_CloseDevice;
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336 impl->LockAudio = MINTDMA8_LockAudio;
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337 impl->UnlockAudio = MINTDMA8_UnlockAudio;
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338 impl->OnlyHasDefaultOutputDevice = 1;
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339 impl->ProvidesOwnCallbackThread = 1;
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340 impl->SkipMixerLock = 1;
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341
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342 return 1;
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343 }
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344
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345 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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346 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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347 MINTDMA8_Available, MINTDMA8_Init, 0
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348 };
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349
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350 /* vi: set ts=4 sw=4 expandtab: */