annotate src/audio/mint/SDL_mintaudio_dma8.c @ 2879:3ff86c46d324

Use SDL_zerop instead of SDL_memset.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 19 Dec 2008 06:43:41 +0000
parents 99210400e8b9
children 2929ed239d2a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 static void
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65 MINTDMA8_LockDevice(_THIS)
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66 {
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67 void *oldpile;
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68
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69 /* Stop replay */
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70 oldpile = (void *) Super(0);
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71 DMAAUDIO_IO.control = 0;
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72 Super(oldpile);
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73 }
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74
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75 static void
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76 MINTDMA8_UnlockDevice(_THIS)
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77 {
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78 void *oldpile;
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79
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80 /* Restart replay */
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81 oldpile = (void *) Super(0);
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82 DMAAUDIO_IO.control = 3;
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83 Super(oldpile);
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84 }
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85
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86 static void
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87 MINTDMA8_CloseDevice(_THIS)
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88 {
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89 if (this->hidden != NULL) {
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90 /* Stop replay */
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91 void *oldpile = (void *) Super(0);
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92
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93 DMAAUDIO_IO.control = 0;
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94 Super(oldpile);
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95
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96 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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98 /* Disable interrupt */
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99 Jdisint(MFP_DMASOUND);
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101 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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103 /* Wait if currently playing sound */
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104 while (SDL_MintAudio_mutex != 0) {
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105 }
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106
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107 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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109 /* Clear buffers */
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110 if (SDL_MintAudio_audiobuf[0]) {
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111 Mfree(SDL_MintAudio_audiobuf[0]);
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112 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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113 }
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114
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115 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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116 SDL_free(this->hidden);
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117 this->hidden = NULL;
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118 }
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119 }
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120
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121 static int
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122 MINTDMA8_CheckAudio(_THIS)
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123 {
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124 int i, masterprediv, sfreq;
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125 unsigned long masterclock;
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126
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127 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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128 SDL_AUDIO_BITSIZE(this->spec.format)));
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129 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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130 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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131 DEBUG_PRINT(("big endian=%d, ",
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132 SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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133 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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134 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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135
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136 if (this->spec.channels > 2) {
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137 this->spec.channels = 2; /* no more than stereo! */
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138 }
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139
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140 /* Check formats available */
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141 this->spec.format = AUDIO_S8;
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142
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143 /* Calculate and select the closest frequency */
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144 sfreq = 0;
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145 masterclock = MASTERCLOCK_STE;
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146 masterprediv = MASTERPREDIV_STE;
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147 switch (cookie_mch >> 16) {
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148 /*
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149 case MCH_STE:
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150 masterclock=MASTERCLOCK_STE;
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151 masterprediv=MASTERPREDIV_STE;
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152 break;
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153 */
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154 case MCH_TT:
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155 masterclock = MASTERCLOCK_TT;
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156 masterprediv = MASTERPREDIV_TT;
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157 break;
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158 case MCH_F30:
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159 case MCH_ARANYM:
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160 masterclock = MASTERCLOCK_FALCON1;
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161 masterprediv = MASTERPREDIV_FALCON;
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162 sfreq = 1;
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163 break;
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164 }
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165
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166 MINTAUDIO_freqcount = 0;
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167 for (i = sfreq; i < 4; i++) {
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168 SDL_MintAudio_AddFrequency(this,
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169 masterclock / (masterprediv * (1 << i)),
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170 masterclock, i - sfreq, -1);
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171 }
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172
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173 #if 1
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174 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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175 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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176 i, MINTAUDIO_frequencies[i].frequency,
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177 MINTAUDIO_frequencies[i].masterclock,
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178 MINTAUDIO_frequencies[i].predivisor));
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179 }
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180 #endif
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181
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182 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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183 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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184
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185 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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186 SDL_AUDIO_BITSIZE(this->spec.format)));
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187 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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188 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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189 DEBUG_PRINT(("big endian=%d, ",
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190 SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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191 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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192 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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193
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194 return 0;
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195 }
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196
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197 static void
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198 MINTDMA8_InitAudio(_THIS)
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199 {
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200 void *oldpile;
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201 unsigned long buffer;
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202 unsigned char mode;
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203
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204 /* Set replay tracks */
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205 if (cookie_snd & SND_16BIT) {
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206 Settracks(0, 0);
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207 Setmontracks(0);
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208 }
644
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209
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210 oldpile = (void *) Super(0);
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211
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212 /* Stop currently playing sound */
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213 DMAAUDIO_IO.control = 0;
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214
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215 /* Set buffer */
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216 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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217 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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218 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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219 DMAAUDIO_IO.start_low = buffer & 255;
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220
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221 buffer += SDL_MintAudio_audiosize;
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222 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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223 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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224 DMAAUDIO_IO.end_low = buffer & 255;
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225
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226 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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227 if (this->spec.channels == 1) {
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228 mode |= 1 << 7;
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229 }
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230 DMAAUDIO_IO.sound_ctrl = mode;
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231
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232 /* Set interrupt */
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233 Jdisint(MFP_DMASOUND);
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234 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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235 Jenabint(MFP_DMASOUND);
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236
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237 if (cookie_snd & SND_16BIT) {
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238 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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239 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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240 }
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241 }
1098
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242
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243 /* Go */
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diff changeset
244 DMAAUDIO_IO.control = 3; /* playback + repeat */
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245
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246 Super(oldpile);
644
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247 }
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248
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249 static int
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250 MINTDMA8_OpenDevice(_THIS, const char *devname, int iscapture)
644
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251 {
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252 SDL_MintAudio_device = this;
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253
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254 /* Check audio capabilities */
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255 if (MINTDMA8_CheckAudio(this) == -1) {
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256 return 0;
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257 }
644
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258
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259 /* Initialize all variables that we clean on shutdown */
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260 this->hidden = (struct SDL_PrivateAudioData *)
2060
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diff changeset
261 SDL_malloc((sizeof *this->hidden));
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262 if (this->hidden == NULL) {
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263 SDL_OutOfMemory();
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264 return 0;
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265 }
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266 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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267
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268 SDL_CalculateAudioSpec(&this->spec);
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269
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270 /* Allocate memory for audio buffers in DMA-able RAM */
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271 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
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272
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273 SDL_MintAudio_audiobuf[0] =
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274 Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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275 if (SDL_MintAudio_audiobuf[0] == NULL) {
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276 SDL_free(this->hidden);
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277 this->hidden = NULL;
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278 SDL_OutOfMemory();
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279 return 0;
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280 }
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281 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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282 SDL_MintAudio_numbuf = 0;
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283 SDL_memset(SDL_MintAudio_audiobuf[0], this->spec.silence,
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284 this->spec.size * 2);
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285 SDL_MintAudio_audiosize = this->spec.size;
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286 SDL_MintAudio_mutex = 0;
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287
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288 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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289 SDL_MintAudio_audiobuf[0]));
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290 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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291 SDL_MintAudio_audiobuf[1]));
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292
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293 SDL_MintAudio_CheckFpu();
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294
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295 /* Setup audio hardware */
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296 MINTDMA8_InitAudio(this);
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297
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298 return 1; /* good to go. */
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299 }
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300
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301 static int
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302 MINTDMA8_Init(SDL_AudioDriverImpl * impl)
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303 {
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304 /* Cookie _MCH present ? if not, assume ST machine */
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305 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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306 cookie_mch = MCH_ST;
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307 }
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308
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309 /* Cookie _SND present ? if not, assume ST machine */
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310 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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311 cookie_snd = SND_PSG;
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312 }
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313
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314 /* Check if we have 8 bits audio */
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315 if ((cookie_snd & SND_8BIT) == 0) {
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316 SDL_SetError(DEBUG_NAME "no 8 bits sound");
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317 return 0;
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318 }
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319
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320 /* Check if audio is lockable */
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321 if (cookie_snd & SND_16BIT) {
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322 if (Locksnd() != 1) {
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323 SDL_SetError(DEBUG_NAME "audio locked by other application");
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324 return 0;
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325 }
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326
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327 Unlocksnd();
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328 }
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329
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330 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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331
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332 /* Set the function pointers */
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333 impl->OpenDevice = MINTDMA8_OpenDevice;
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334 impl->CloseDevice = MINTDMA8_CloseDevice;
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335 impl->LockDevice = MINTDMA8_LockDevice;
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336 impl->UnlockDevice = MINTDMA8_UnlockDevice;
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337 impl->OnlyHasDefaultOutputDevice = 1;
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338 impl->ProvidesOwnCallbackThread = 1;
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339 impl->SkipMixerLock = 1;
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340
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341 return 1;
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342 }
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343
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344 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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345 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver", MINTDMA8_Init, 0
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346 };
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347
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348 /* vi: set ts=4 sw=4 expandtab: */