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annotate src/audio/mint/SDL_mintaudio.c @ 1111:12c49532be00

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Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
author Patrice Mandin <patmandin@gmail.com>
date Wed, 10 Aug 2005 13:29:49 +0000
parents 856f76a099c7
children 080ed9ef0609
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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185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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141 return MINTAUDIO_freqcount-1;
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142 }
1111
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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(1000);
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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 }