Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_stfa.c @ 772:5c5656163ebd

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Fix buffer underrun problems on slow iBooks
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 21:32:47 +0000
parents b8d311d90021
children 185acc07127a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
769
b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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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 MiNT audio driver
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25 using XBIOS functions (STFA driver)
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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 <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 /* Mint includes */
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35 #include <mint/osbind.h>
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36 #include <mint/falcon.h>
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37 #include <mint/cookie.h>
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38
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39 #include "SDL_endian.h"
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40 #include "SDL_audio.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_audiomem.h"
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43 #include "SDL_sysaudio.h"
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44
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45 #include "SDL_atarimxalloc_c.h"
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46
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47 #include "SDL_mintaudio.h"
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48 #include "SDL_mintaudio_stfa.h"
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49
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50 /*--- Defines ---*/
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51
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52 #define MINT_AUDIO_DRIVER_NAME "mint_stfa"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:stfa: "
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56 #if 0
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57 #define DEBUG_PRINT(what) \
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58 { \
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59 printf what; \
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60 }
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61 #else
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62 #define DEBUG_PRINT(what)
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63 #endif
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64
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65 /*--- Static variables ---*/
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66
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67 static unsigned long cookie_snd, cookie_mch;
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68 static cookie_stfa_t *cookie_stfa;
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69
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70 static const int freqs[16]={
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71 4995, 6269, 7493, 8192,
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72 9830, 10971, 12538, 14985,
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73 16384, 19819, 21943, 24576,
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74 30720, 32336, 43885, 49152
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75 };
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76
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77 /*--- Audio driver functions ---*/
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78
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79 static void Mint_CloseAudio(_THIS);
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80 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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81 static void Mint_LockAudio(_THIS);
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82 static void Mint_UnlockAudio(_THIS);
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83
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84 /* To check/init hardware audio */
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85 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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86 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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87
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88 /*--- Audio driver bootstrap functions ---*/
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89
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90 static int Audio_Available(void)
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91 {
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92 const char *envr = getenv("SDL_AUDIODRIVER");
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93
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94 /* Check if user asked a different audio driver */
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95 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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96 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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97 return(0);
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98 }
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99
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100 /* Cookie _MCH present ? if not, assume ST machine */
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101 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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102 cookie_mch = MCH_ST;
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103 }
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104
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105 /* Cookie _SND present ? if not, assume ST machine */
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106 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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107 cookie_snd = SND_PSG;
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108 }
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109
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110 /* Cookie STFA present ? */
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111 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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112 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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113 return(0);
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114 }
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115
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116 SDL_MintAudio_stfa = cookie_stfa;
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117
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118 DEBUG_PRINT((DEBUG_NAME "STFA audio available!\n"));
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119 return(1);
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120 }
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121
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122 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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123 {
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124 free(device->hidden);
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125 free(device);
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126 }
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127
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128 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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129 {
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130 SDL_AudioDevice *this;
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131
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132 /* Initialize all variables that we clean on shutdown */
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133 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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134 if ( this ) {
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135 memset(this, 0, (sizeof *this));
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136 this->hidden = (struct SDL_PrivateAudioData *)
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137 malloc((sizeof *this->hidden));
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138 }
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139 if ( (this == NULL) || (this->hidden == NULL) ) {
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140 SDL_OutOfMemory();
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141 if ( this ) {
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142 free(this);
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143 }
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144 return(0);
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145 }
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146 memset(this->hidden, 0, (sizeof *this->hidden));
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147
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148 /* Set the function pointers */
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149 this->OpenAudio = Mint_OpenAudio;
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150 this->CloseAudio = Mint_CloseAudio;
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151 this->LockAudio = Mint_LockAudio;
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diff changeset
152 this->UnlockAudio = Mint_UnlockAudio;
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diff changeset
153 this->free = Audio_DeleteDevice;
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154
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155 return this;
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diff changeset
156 }
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157
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diff changeset
158 AudioBootStrap MINTAUDIO_STFA_bootstrap = {
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diff changeset
159 MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver",
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diff changeset
160 Audio_Available, Audio_CreateDevice
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diff changeset
161 };
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162
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163 static void Mint_LockAudio(_THIS)
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164 {
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165 void *oldpile;
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166
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167 /* Stop replay */
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168 oldpile=(void *)Super(0);
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169 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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170 Super(oldpile);
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171 }
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172
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173 static void Mint_UnlockAudio(_THIS)
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174 {
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175 void *oldpile;
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176
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177 /* Restart replay */
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178 oldpile=(void *)Super(0);
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179 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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180 Super(oldpile);
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181 }
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182
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183 static void Mint_CloseAudio(_THIS)
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184 {
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185 void *oldpile;
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186
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187 /* Stop replay */
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188 oldpile=(void *)Super(0);
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189 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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diff changeset
190 Super(oldpile);
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191
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diff changeset
192 /* Wait if currently playing sound */
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193 while (SDL_MintAudio_mutex != 0) {
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194 }
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195
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196 /* Clear buffers */
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197 if (SDL_MintAudio_audiobuf[0]) {
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198 Mfree(SDL_MintAudio_audiobuf[0]);
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199 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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200 }
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diff changeset
201 }
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202
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diff changeset
203 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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204 {
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diff changeset
205 int i;
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206
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207 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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208 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
209 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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210 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
211 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
212
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diff changeset
213 /* Check formats available */
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214 MINTAUDIO_nfreq=16;
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215 MINTAUDIO_sfreq=0;
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216 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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217 MINTAUDIO_hardfreq[i]=freqs[15-i];
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diff changeset
218 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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219 }
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220
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diff changeset
221 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
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diff changeset
222 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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223
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diff changeset
224 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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225 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
226 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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227 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
228 DEBUG_PRINT(("freq=%d\n", spec->freq));
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229
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230 return 0;
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diff changeset
231 }
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diff changeset
232
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diff changeset
233 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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234 {
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diff changeset
235 void *buffer;
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diff changeset
236 void *oldpile;
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237
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diff changeset
238 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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239
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240 oldpile=(void *)Super(0);
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241
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diff changeset
242 /* Stop replay */
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diff changeset
243 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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244
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diff changeset
245 /* Select replay format */
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diff changeset
246 cookie_stfa->sound_control = 15-MINTAUDIO_numfreq;
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diff changeset
247 if ((spec->format & 0xff)==8) {
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diff changeset
248 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
249 } else {
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diff changeset
250 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
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diff changeset
251 }
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
252 if (spec->channels==2) {
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diff changeset
253 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
254 } else {
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diff changeset
255 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
256 }
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
257 if ((spec->format & 0x8000)!=0) {
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
258 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
259 } else {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
260 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
261 }
704
c4803992e09c Small bugfixes
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diff changeset
262 if ((spec->format & 0x1000)!=0) {
c4803992e09c Small bugfixes
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parents: 644
diff changeset
263 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
264 } else {
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
265 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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diff changeset
266 }
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
267
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diff changeset
268 /* Set buffer */
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diff changeset
269 cookie_stfa->sound_start = (unsigned long) buffer;
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diff changeset
270 cookie_stfa->sound_end = (unsigned long) (buffer + spec->size);
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diff changeset
271
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diff changeset
272 /* Set interrupt */
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diff changeset
273 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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diff changeset
274
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diff changeset
275 /* Restart replay */
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diff changeset
276 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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diff changeset
277
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278 Super(oldpile);
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diff changeset
279
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280 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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281 }
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282
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diff changeset
283 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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284 {
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diff changeset
285 SDL_MintAudio_device = this;
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286
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diff changeset
287 /* Check audio capabilities */
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diff changeset
288 if (Mint_CheckAudio(this, spec)==-1) {
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289 return -1;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
290 }
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diff changeset
291
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diff changeset
292 SDL_CalculateAudioSpec(spec);
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diff changeset
293
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
294 /* Allocate memory for audio buffers in DMA-able RAM */
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diff changeset
295 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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parents:
diff changeset
296
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
297 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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diff changeset
298 if (SDL_MintAudio_audiobuf[0]==NULL) {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
299 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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300 return (-1);
594422ab8f9f Atari MiNT: added more audio drivers
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301 }
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302 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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303 SDL_MintAudio_numbuf=0;
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304 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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305 SDL_MintAudio_audiosize = spec->size;
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306 SDL_MintAudio_mutex = 0;
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307
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308 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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309 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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310
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311 /* Setup audio hardware */
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312 Mint_InitAudio(this, spec);
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313
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314 return(1); /* We don't use threaded audio */
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315 }