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annotate src/audio/mint/SDL_mintaudio.c @ 2697:c9121b04cffa gsoc2008_nds

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Some more work on the audio driver.
author Darren Alton <dalton@stevens.edu>
date Thu, 21 Aug 2008 12:38:21 +0000
parents 0b24732b1134
children 99210400e8b9
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 #include <mint/cookie.h>
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36
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37 #include "SDL_audio.h"
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38 #include "SDL_mintaudio.h"
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39 #include "SDL_mintaudio_stfa.h"
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40
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41 /* The audio device */
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42
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43 SDL_AudioDevice *SDL_MintAudio_device;
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44 Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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45 unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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46 volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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47 volatile unsigned short SDL_MintAudio_mutex;
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48 volatile unsigned long SDL_MintAudio_clocktics;
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49 cookie_stfa_t *SDL_MintAudio_stfa;
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50
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51 /* MiNT thread variables */
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52 SDL_bool SDL_MintAudio_mint_present;
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53 SDL_bool SDL_MintAudio_quit_thread;
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54 SDL_bool SDL_MintAudio_thread_finished;
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55 long SDL_MintAudio_thread_pid;
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56
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57 /* The callback function, called by each driver whenever needed */
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58
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59 void
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60 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 SDL_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 SDL_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,
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82 audio->convert.len);
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83 SDL_ConvertAudio(&audio->convert);
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84 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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85 } else {
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86 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
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87 }
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88 }
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89
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90 /* Add a new frequency/clock/predivisor to the current list */
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91 void
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92 SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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93 Uint32 prediv, int gpio_bits)
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94 {
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95 int i, p;
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96
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97 if (MINTAUDIO_freqcount == MINTAUDIO_maxfreqs) {
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98 return;
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99 }
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100
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101 /* Search where to insert the frequency (highest first) */
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102 for (p = 0; p < MINTAUDIO_freqcount; p++) {
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103 if (frequency > MINTAUDIO_frequencies[p].frequency) {
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104 break;
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105 }
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106 }
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107
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108 /* Put all following ones farer */
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109 if (MINTAUDIO_freqcount > 0) {
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110 for (i = MINTAUDIO_freqcount; i > p; i--) {
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111 SDL_memcpy(&MINTAUDIO_frequencies[i],
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112 &MINTAUDIO_frequencies[i - 1],
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113 sizeof(mint_frequency_t));
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114 }
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115 }
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116
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117 /* And insert new one */
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118 MINTAUDIO_frequencies[p].frequency = frequency;
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119 MINTAUDIO_frequencies[p].masterclock = clock;
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120 MINTAUDIO_frequencies[p].predivisor = prediv;
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121 MINTAUDIO_frequencies[p].gpio_bits = gpio_bits;
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122
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123 MINTAUDIO_freqcount++;
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124 }
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125
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126 /* Search for the nearest frequency */
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127 int
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128 SDL_MintAudio_SearchFrequency(_THIS, int desired_freq)
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129 {
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130 int i;
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131
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132 /* Only 1 freq ? */
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133 if (MINTAUDIO_freqcount == 1) {
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134 return 0;
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135 }
398
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136
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137 /* Check the array */
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138 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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139 if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency +
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140 MINTAUDIO_frequencies[i + 1].frequency) >> 1)) {
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141 return i;
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142 }
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143 }
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144
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145 /* Not in the array, give the latest */
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146 return MINTAUDIO_freqcount - 1;
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147 }
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148
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149 /* Check if FPU is present */
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150 void
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151 SDL_MintAudio_CheckFpu(void)
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152 {
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153 unsigned long cookie_fpu;
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154
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155 SDL_MintAudio_hasfpu = 0;
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156 if (Getcookie(C__FPU, &cookie_fpu) != C_FOUND) {
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157 return;
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158 }
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159 switch ((cookie_fpu >> 16) & 0xfffe) {
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160 case 2:
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161 case 4:
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162 case 6:
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163 case 8:
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164 case 16:
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165 SDL_MintAudio_hasfpu = 1;
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166 break;
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167 }
2027
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168 }
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169
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170 /* The thread function, used under MiNT with xbios */
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171 int
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172 SDL_MintAudio_Thread(long param)
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173 {
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174 SndBufPtr pointers;
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175 SDL_bool buffers_filled[2] = { SDL_FALSE, SDL_FALSE };
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176
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177 SDL_MintAudio_thread_finished = SDL_FALSE;
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178 while (!SDL_MintAudio_quit_thread) {
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179 if (Buffptr(&pointers) != 0)
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180 continue;
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181
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182 if (((unsigned long) pointers.play >=
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183 (unsigned long) SDL_MintAudio_audiobuf[0])
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184 && ((unsigned long) pointers.play <=
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185 (unsigned long) SDL_MintAudio_audiobuf[1])) {
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186 /* DMA is reading buffer #0, setup buffer #1 if not already done */
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187 if (!buffers_filled[1]) {
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188 SDL_MintAudio_numbuf = 1;
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189 SDL_MintAudio_Callback();
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190 Setbuffer(0, SDL_MintAudio_audiobuf[1],
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191 SDL_MintAudio_audiobuf[1] +
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192 SDL_MintAudio_audiosize);
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193 buffers_filled[1] = SDL_TRUE;
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194 buffers_filled[0] = SDL_FALSE;
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195 }
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196 } else {
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197 /* DMA is reading buffer #1, setup buffer #0 if not already done */
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198 if (!buffers_filled[0]) {
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199 SDL_MintAudio_numbuf = 0;
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200 SDL_MintAudio_Callback();
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201 Setbuffer(0, SDL_MintAudio_audiobuf[0],
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202 SDL_MintAudio_audiobuf[0] +
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203 SDL_MintAudio_audiosize);
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204 buffers_filled[0] = SDL_TRUE;
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205 buffers_filled[1] = SDL_FALSE;
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206 }
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207 }
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208
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209 usleep(100);
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210 }
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211 SDL_MintAudio_thread_finished = SDL_TRUE;
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212 return 0;
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213 }
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214
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215 void
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216 SDL_MintAudio_WaitThread(void)
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217 {
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218 if (!SDL_MintAudio_mint_present)
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219 return;
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220
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221 if (SDL_MintAudio_thread_finished)
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222 return;
1111
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223
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224 SDL_MintAudio_quit_thread = SDL_TRUE;
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225 while (!SDL_MintAudio_thread_finished) {
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226 Syield();
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227 }
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228 }
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229
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230 /* vi: set ts=4 sw=4 expandtab: */