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annotate src/audio/mint/SDL_mintaudio.c @ 1135:cf6133247d34

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Mac Classic and CodeWarrior patches. --ryan. From: =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb@algonet.se> Subject: Re: [SDL] Updated Mac patch Date: Tue, 6 Sep 2005 15:21:27 +0200 To: A list for developers using the SDL library <sdl@libsdl.org> Earlier, I wrote: > Updated the previous Mac patch to disable Carbon by default. > Also "fixed" the SDL.spec again, so that it builds on Darwin. > > http://www.algonet.se/~afb/SDL-1.2.9-mac.patch > Also applied fine to SDL12 CVS, when I tried it. > > Haven't completed any new packaging or projects for Xcode/PB, > but it seems to build and install fine here (in development). Tested the new patch to build with old CodeWarrior and MPW, and it seems it needed some hacks with those old headers... Just in case you want to support the archeological versions - here is a small add-on to the above patch, to fix those... http://www.algonet.se/~afb/SDL-1.2.9-classic.patch I couldn't get the old CW5 projects to build without a few modifications - such as deleting the stray old header in: "CWprojects/Support/Carbon/Include/ConditionalMacros.h" ? But I updated both projects to CW6 too and built for Carbon, and it ran all of the Mac test projects without any problems. The MPW file seems to have compiled, with a small order change. As long as you're still shipping the CWProjects and MPWmake with the download, they should probably be updated/fixed ? (another "solution" would of course be to just delete them) I'll post my new projects along with the new Xcode projects later on, along with XML exports of the various .mcp files. (CW5 builds for Classic / "PPC", and CW6 builds for Carbon) It'll be packaged as a part of the next SpriteWorld X release... http://spriteworldx.sourceforge.net/ [Classic/Carbon/Win/X11] --anders
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 08 Sep 2005 06:34:28 +0000
parents 080ed9ef0609
children 3692456e7b0f
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
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23 /*
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24 Audio interrupt variables and callback function
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25
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26 Patrice Mandin
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27 */
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28
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29 #include <string.h>
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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_types.h"
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37 #include "SDL_audio.h"
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38
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39 #include "SDL_mintaudio.h"
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40 #include "SDL_mintaudio_stfa.h"
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41
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42 /* The audio device */
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43
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44 SDL_AudioDevice *SDL_MintAudio_device;
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45 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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46 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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47 unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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48 unsigned short SDL_MintAudio_mutex;
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49 unsigned long SDL_MintAudio_clocktics;
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50 cookie_stfa_t *SDL_MintAudio_stfa;
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51
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52 /* MiNT thread variables */
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53 SDL_bool SDL_MintAudio_mint_present;
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54 SDL_bool SDL_MintAudio_quit_thread;
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55 SDL_bool SDL_MintAudio_thread_finished;
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56 long SDL_MintAudio_thread_pid;
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57
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58 /* The callback function, called by each driver whenever needed */
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59
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60 void SDL_MintAudio_Callback(void)
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61 {
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62 Uint8 *buffer;
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63 SDL_AudioDevice *audio = SDL_MintAudio_device;
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64
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65 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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66 memset(buffer, audio->spec.silence, audio->spec.size);
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67
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68 if (audio->paused)
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69 return;
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70
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71 if (audio->convert.needed) {
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72 int silence;
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73
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74 if ( audio->convert.src_format == AUDIO_U8 ) {
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75 silence = 0x80;
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76 } else {
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77 silence = 0;
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78 }
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79 memset(audio->convert.buf, silence, audio->convert.len);
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80 audio->spec.callback(audio->spec.userdata,
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81 (Uint8 *)audio->convert.buf,audio->convert.len);
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82 SDL_ConvertAudio(&audio->convert);
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83 memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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84 } else {
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85 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
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86 }
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87 }
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88
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89 /* Add a new frequency/clock/predivisor to the current list */
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90 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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91 Uint32 prediv, int gpio_bits)
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92 {
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93 int i, p;
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94
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95 if (MINTAUDIO_freqcount==MINTAUDIO_maxfreqs) {
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96 return;
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97 }
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98
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99 /* Search where to insert the frequency (highest first) */
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100 for (p=0; p<MINTAUDIO_freqcount; p++) {
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101 if (frequency > MINTAUDIO_frequencies[p].frequency) {
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102 break;
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103 }
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104 }
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105
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106 /* Put all following ones farer */
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107 if (MINTAUDIO_freqcount>0) {
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108 for (i=MINTAUDIO_freqcount; i>p; i--) {
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109 memcpy(&MINTAUDIO_frequencies[i], &MINTAUDIO_frequencies[i-1], sizeof(mint_frequency_t));
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110 }
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111 }
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112
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113 /* And insert new one */
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114 MINTAUDIO_frequencies[p].frequency = frequency;
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115 MINTAUDIO_frequencies[p].masterclock = clock;
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116 MINTAUDIO_frequencies[p].predivisor = prediv;
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117 MINTAUDIO_frequencies[p].gpio_bits = gpio_bits;
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118
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119 MINTAUDIO_freqcount++;
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120 }
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121
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122 /* Search for the nearest frequency */
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123 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq)
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124 {
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125 int i;
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126
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127 /* Only 1 freq ? */
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128 if (MINTAUDIO_freqcount==1) {
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129 return 0;
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130 }
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131
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132 /* Check the array */
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133 for (i=0; i<MINTAUDIO_freqcount; i++) {
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134 if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency+
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135 MINTAUDIO_frequencies[i+1].frequency)>>1)) {
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136 return i;
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137 }
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138 }
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139
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140 /* Not in the array, give the latest */
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141 return MINTAUDIO_freqcount-1;
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142 }
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143
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144 /* The thread function, used under MiNT with xbios */
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145 int SDL_MintAudio_Thread(long param)
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146 {
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147 SndBufPtr pointers;
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148 SDL_bool buffers_filled[2] = {SDL_FALSE, SDL_FALSE};
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149
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150 SDL_MintAudio_thread_finished = SDL_FALSE;
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151 while (!SDL_MintAudio_quit_thread) {
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152 if (Buffptr(&pointers)!=0)
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153 continue;
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154
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155 if (( (unsigned long)pointers.play>=(unsigned long)SDL_MintAudio_audiobuf[0])
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156 && ( (unsigned long)pointers.play<=(unsigned long)SDL_MintAudio_audiobuf[1]))
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157 {
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158 /* DMA is reading buffer #0, setup buffer #1 if not already done */
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159 if (!buffers_filled[1]) {
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160 SDL_MintAudio_numbuf = 1;
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161 SDL_MintAudio_Callback();
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162 Setbuffer(0, SDL_MintAudio_audiobuf[1], SDL_MintAudio_audiobuf[1] + SDL_MintAudio_audiosize);
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163 buffers_filled[1]=SDL_TRUE;
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164 buffers_filled[0]=SDL_FALSE;
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165 }
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166 } else {
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167 /* DMA is reading buffer #1, setup buffer #0 if not already done */
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168 if (!buffers_filled[0]) {
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169 SDL_MintAudio_numbuf = 0;
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170 SDL_MintAudio_Callback();
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171 Setbuffer(0, SDL_MintAudio_audiobuf[0], SDL_MintAudio_audiobuf[0] + SDL_MintAudio_audiosize);
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172 buffers_filled[0]=SDL_TRUE;
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173 buffers_filled[1]=SDL_FALSE;
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174 }
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175 }
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176
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177 usleep(100);
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178 }
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179 SDL_MintAudio_thread_finished = SDL_TRUE;
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180 return 0;
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181 }
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182
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183 void SDL_MintAudio_WaitThread(void)
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184 {
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185 if (!SDL_MintAudio_mint_present)
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186 return;
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187
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188 if (SDL_MintAudio_thread_finished)
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189 return;
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190
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191 SDL_MintAudio_quit_thread = SDL_TRUE;
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192 while (!SDL_MintAudio_thread_finished) {
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193 Syield();
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194 }
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195 }