Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_stfa.c @ 3842:6b04ca2f1016 SDL-ryan-multiple-audio-device

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Moved DirectSound audio target to SDL 1.3 API and did some house cleaning.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:37:42 +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 XBIOS functions (STFA driver)
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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_stfa.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_stfa"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:stfa: "
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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 = 0;
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63 static unsigned long cookie_mch = 0;
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64 static cookie_stfa_t *cookie_stfa = NULL;
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65
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66 static const int freqs[16] = {
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67 4995, 6269, 7493, 8192,
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68 9830, 10971, 12538, 14985,
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69 16384, 19819, 21943, 24576,
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70 30720, 32336, 43885, 49152
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71 };
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72
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73 static int
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74 MINTSTFA_Available(void)
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75 {
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76 /* Cookie _MCH present ? if not, assume ST machine */
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77 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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78 cookie_mch = MCH_ST;
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79 }
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80
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81 /* Cookie _SND present ? if not, assume ST machine */
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82 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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83 cookie_snd = SND_PSG;
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84 }
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85
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86 /* Cookie STFA present ? */
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87 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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88 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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89 return (0);
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90 }
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91
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92 SDL_MintAudio_stfa = cookie_stfa;
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93
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94 DEBUG_PRINT((DEBUG_NAME "STFA 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 MINTSTFA_LockDevice(_THIS)
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100 {
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101 /* Stop replay */
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102 void *oldpile = (void *) Super(0);
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103 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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104 Super(oldpile);
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105 }
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106
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107 static void
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108 MINTSTFA_UnlockDevice(_THIS)
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109 {
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110 /* Restart replay */
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111 void *oldpile = (void *) Super(0);
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112 cookie_stfa->sound_enable = STFA_PLAY_ENABLE | STFA_PLAY_REPEAT;
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113 Super(oldpile);
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114 }
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115
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116 static void
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117 MINTSTFA_CloseDevice(_THIS)
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118 {
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119 if (this->hidden != NULL) {
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120 /* Stop replay */
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121 void *oldpile = (void *) Super(0);
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122 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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123 Super(oldpile);
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124
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125 /* Wait if currently playing sound */
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126 while (SDL_MintAudio_mutex != 0) {}
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127
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128 /* Clear buffers */
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129 if (SDL_MintAudio_audiobuf[0]) {
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130 Mfree(SDL_MintAudio_audiobuf[0]);
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131 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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132 }
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133
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134 SDL_free(this->hidden);
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135 this->hidden = NULL;
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136 }
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137 }
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138
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139 static int
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140 MINTSTFA_CheckAudio(_THIS)
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141 {
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142 int i;
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143
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144 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",
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145 SDL_AUDIO_BITSIZE(this->spec.format)));
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146 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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147 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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148 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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149 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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150 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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151
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152 if (SDL_AUDIO_BITSIZE(this->spec.format) > 16) {
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153 this->spec.format = AUDIO_S16SYS; /* clamp out int32/float32 ... */
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154 }
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155
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156 if (this->spec.channels > 2) {
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157 this->spec.channels = 2; /* no more than stereo! */
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158 }
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159
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160 /* Check formats available */
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161 MINTAUDIO_freqcount = 0;
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162 for (i = 0; i < 16; i++) {
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163 SDL_MintAudio_AddFrequency(this, freqs[i], 0, i, -1);
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164 }
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165
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166 #if 1
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167 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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168 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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169 i, MINTAUDIO_frequencies[i].frequency,
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170 MINTAUDIO_frequencies[i].masterclock,
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171 MINTAUDIO_frequencies[i].predivisor));
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172 }
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173 #endif
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174
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175 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, this->spec.freq);
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176 this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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177
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178 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",
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179 SDL_AUDIO_BITSIZE(this->spec.format)));
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180 DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));
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181 DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));
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182 DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));
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183 DEBUG_PRINT(("channels=%d, ", this->spec.channels));
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184 DEBUG_PRINT(("freq=%d\n", this->spec.freq));
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185
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186 return 0;
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187 }
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188
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189 static void
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190 MINTSTFA_InitAudio(_THIS)
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191 {
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192 void *buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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193 void *oldpile = (void *) Super(0);
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194
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195 /* Stop replay */
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196 cookie_stfa->sound_enable = STFA_PLAY_DISABLE;
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197
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198 /* Select replay format */
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199 cookie_stfa->sound_control =
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200 MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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201 if (SDL_AUDIO_BITSIZE(this->spec.format) == 8) {
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202 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
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203 } else {
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204 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
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205 }
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206 if (this->spec.channels == 2) {
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207 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
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208 } else {
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209 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
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210 }
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211 if (SDL_AUDIO_ISSIGNED(this->spec.format) != 0) {
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212 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
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213 } else {
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214 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
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215 }
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216 if (SDL_AUDIO_ISBIGENDIAN(this->spec.format) != 0) {
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217 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
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218 } else {
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219 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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220 }
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221
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222 /* Set buffer */
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223 cookie_stfa->sound_start = (unsigned long) buffer;
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224 cookie_stfa->sound_end = (unsigned long) (buffer + this->spec.size);
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225
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226 /* Set interrupt */
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227 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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228
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229 /* Restart replay */
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230 cookie_stfa->sound_enable = STFA_PLAY_ENABLE | STFA_PLAY_REPEAT;
644
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231
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232 Super(oldpile);
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233
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234 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
644
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235 }
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236
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237 static int
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238 MINTSTFA_OpenDevice(_THIS, const char *devname, int iscapture)
644
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239 {
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240 SDL_MintAudio_device = this;
644
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241
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242 /* Check audio capabilities */
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243 if (MINTSTFA_CheckAudio(this) == -1) {
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244 return 0;
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245 }
644
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246
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247 /* Initialize all variables that we clean on shutdown */
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248 this->hidden = (struct SDL_PrivateAudioData *)
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249 SDL_malloc((sizeof *this->hidden));
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250 if (this->hidden == NULL) {
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251 SDL_OutOfMemory();
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252 return 0;
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253 }
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254 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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255
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256 SDL_CalculateAudioSpec(&this->spec);
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257
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258 /* Allocate memory for audio buffers in DMA-able RAM */
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259 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", this->spec.size));
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260
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261 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(this->spec.size * 2, MX_STRAM);
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262 if (SDL_MintAudio_audiobuf[0] == NULL) {
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263 SDL_OutOfMemory()
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264 SDL_free(this->hidden);
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265 this->hidden = NULL;
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266 return 0;
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267 }
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268 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + this->spec.size;
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269 SDL_MintAudio_numbuf = 0;
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270 SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2);
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271 SDL_MintAudio_audiosize = this->spec.size;
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272 SDL_MintAudio_mutex = 0;
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273
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274 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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275 SDL_MintAudio_audiobuf[0]));
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276 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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277 SDL_MintAudio_audiobuf[1]));
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278
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279 SDL_MintAudio_CheckFpu();
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280
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281 /* Setup audio hardware */
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282 MINTSTFA_InitAudio(this);
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283
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284 return 1; /* good to go. */
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285 }
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286
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287
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288 static int
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289 MINTSTFA_Init(SDL_AudioDriverImpl *impl)
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290 {
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291 /* Set the function pointers */
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292 impl->OpenDevice = MINTSTFA_OpenDevice;
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293 impl->CloseDevice = MINTSTFA_CloseDevice;
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294 impl->LockAudio = MINTSTFA_LockAudio;
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295 impl->UnlockAudio = MINTSTFA_UnlockAudio;
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296 impl->OnlyHasDefaultOutputDevice = 1;
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297 impl->ProvidesOwnCallbackThread = 1;
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298 impl->SkipMixerLock = 1;
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299
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300 return 1;
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301 }
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302
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303 AudioBootStrap MINTAUDIO_STFA_bootstrap = {
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304 MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver",
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305 MINTSTFA_Available, MINTSTFA_Init, 0
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306 };
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307
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308 /* vi: set ts=4 sw=4 expandtab: */