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annotate src/audio/mint/SDL_mintaudio.c @ 1621:f12379c41042

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Fixes bug #195: The proper name of Apple's operating system is "Mac OS X" not "MacOS X", as can bee seen in many places, for example http://www.apple.com/macosx/). This contrasts the naming of the old operating system, which was called "MacOS" and today is often refered to as "MacOS Classic". The attached patches fixes the misuse of the name "MacOS X" in both the SDL12 and sdlweb CVS modules.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 13:08:26 +0000
parents d910939febfa
children 14717b52abc0
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 Audio interrupt variables and callback function
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26
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27 Patrice Mandin
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28 */
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29
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30 #include <unistd.h>
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31
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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/mintbind.h>
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35
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36 #include "SDL_audio.h"
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37 #include "SDL_mintaudio.h"
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38 #include "SDL_mintaudio_stfa.h"
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39
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40 /* The audio device */
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41
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42 SDL_AudioDevice *SDL_MintAudio_device;
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43 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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44 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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45 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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46 unsigned short SDL_MintAudio_mutex;
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47 unsigned long SDL_MintAudio_clocktics;
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48 cookie_stfa_t *SDL_MintAudio_stfa;
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49
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50 /* MiNT thread variables */
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51 SDL_bool SDL_MintAudio_mint_present;
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52 SDL_bool SDL_MintAudio_quit_thread;
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53 SDL_bool SDL_MintAudio_thread_finished;
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54 long SDL_MintAudio_thread_pid;
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55
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56 /* The callback function, called by each driver whenever needed */
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57
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58 void SDL_MintAudio_Callback(void)
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59 {
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60 Uint8 *buffer;
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61 SDL_AudioDevice *audio = SDL_MintAudio_device;
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62
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63 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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64 SDL_memset(buffer, audio->spec.silence, audio->spec.size);
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65
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66 if (audio->paused)
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67 return;
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68
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69 if (audio->convert.needed) {
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70 int silence;
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71
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72 if ( audio->convert.src_format == AUDIO_U8 ) {
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73 silence = 0x80;
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74 } else {
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75 silence = 0;
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76 }
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77 SDL_memset(audio->convert.buf, silence, audio->convert.len);
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78 audio->spec.callback(audio->spec.userdata,
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79 (Uint8 *)audio->convert.buf,audio->convert.len);
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80 SDL_ConvertAudio(&audio->convert);
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81 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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82 } else {
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83 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
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84 }
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85 }
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86
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87 /* Add a new frequency/clock/predivisor to the current list */
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88 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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89 Uint32 prediv, int gpio_bits)
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90 {
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91 int i, p;
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92
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93 if (MINTAUDIO_freqcount==MINTAUDIO_maxfreqs) {
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94 return;
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95 }
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96
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97 /* Search where to insert the frequency (highest first) */
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98 for (p=0; p<MINTAUDIO_freqcount; p++) {
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99 if (frequency > MINTAUDIO_frequencies[p].frequency) {
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100 break;
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101 }
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102 }
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103
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104 /* Put all following ones farer */
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105 if (MINTAUDIO_freqcount>0) {
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106 for (i=MINTAUDIO_freqcount; i>p; i--) {
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107 SDL_memcpy(&MINTAUDIO_frequencies[i], &MINTAUDIO_frequencies[i-1], sizeof(mint_frequency_t));
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108 }
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109 }
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110
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111 /* And insert new one */
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112 MINTAUDIO_frequencies[p].frequency = frequency;
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113 MINTAUDIO_frequencies[p].masterclock = clock;
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114 MINTAUDIO_frequencies[p].predivisor = prediv;
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115 MINTAUDIO_frequencies[p].gpio_bits = gpio_bits;
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116
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117 MINTAUDIO_freqcount++;
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118 }
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119
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120 /* Search for the nearest frequency */
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121 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq)
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122 {
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123 int i;
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124
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125 /* Only 1 freq ? */
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126 if (MINTAUDIO_freqcount==1) {
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127 return 0;
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128 }
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129
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130 /* Check the array */
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131 for (i=0; i<MINTAUDIO_freqcount; i++) {
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132 if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency+
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133 MINTAUDIO_frequencies[i+1].frequency)>>1)) {
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134 return i;
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135 }
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136 }
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137
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138 /* Not in the array, give the latest */
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185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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139 return MINTAUDIO_freqcount-1;
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d219b0e02f5f Added Atari audio support (thanks Patrice!)
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140 }
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141
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142 /* The thread function, used under MiNT with xbios */
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143 int SDL_MintAudio_Thread(long param)
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144 {
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145 SndBufPtr pointers;
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146 SDL_bool buffers_filled[2] = {SDL_FALSE, SDL_FALSE};
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147
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148 SDL_MintAudio_thread_finished = SDL_FALSE;
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149 while (!SDL_MintAudio_quit_thread) {
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150 if (Buffptr(&pointers)!=0)
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151 continue;
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152
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153 if (( (unsigned long)pointers.play>=(unsigned long)SDL_MintAudio_audiobuf[0])
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154 && ( (unsigned long)pointers.play<=(unsigned long)SDL_MintAudio_audiobuf[1]))
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155 {
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156 /* DMA is reading buffer #0, setup buffer #1 if not already done */
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157 if (!buffers_filled[1]) {
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158 SDL_MintAudio_numbuf = 1;
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159 SDL_MintAudio_Callback();
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160 Setbuffer(0, SDL_MintAudio_audiobuf[1], SDL_MintAudio_audiobuf[1] + SDL_MintAudio_audiosize);
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161 buffers_filled[1]=SDL_TRUE;
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162 buffers_filled[0]=SDL_FALSE;
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163 }
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164 } else {
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165 /* DMA is reading buffer #1, setup buffer #0 if not already done */
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166 if (!buffers_filled[0]) {
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167 SDL_MintAudio_numbuf = 0;
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168 SDL_MintAudio_Callback();
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169 Setbuffer(0, SDL_MintAudio_audiobuf[0], SDL_MintAudio_audiobuf[0] + SDL_MintAudio_audiosize);
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170 buffers_filled[0]=SDL_TRUE;
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171 buffers_filled[1]=SDL_FALSE;
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172 }
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173 }
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174
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080ed9ef0609 Sleep a bit less in thread
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175 usleep(100);
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176 }
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177 SDL_MintAudio_thread_finished = SDL_TRUE;
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178 return 0;
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179 }
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180
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181 void SDL_MintAudio_WaitThread(void)
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182 {
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183 if (!SDL_MintAudio_mint_present)
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184 return;
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185
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186 if (SDL_MintAudio_thread_finished)
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187 return;
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188
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189 SDL_MintAudio_quit_thread = SDL_TRUE;
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190 while (!SDL_MintAudio_thread_finished) {
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191 Syield();
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192 }
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193 }