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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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 MiNT audio driver
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26 using XBIOS functions (GSXB compatible driver)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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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/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_gsxb.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:gsxb: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_gsxb;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 static void Mint_CloseAudio(_THIS);
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67 static int Mint_OpenAudio(_THIS, SDL_AudioSpec * spec);
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68 static void Mint_LockAudio(_THIS);
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69 static void Mint_UnlockAudio(_THIS);
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70
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71 /* To check/init hardware audio */
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72 static int Mint_CheckAudio(_THIS, SDL_AudioSpec * spec);
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73 static void Mint_InitAudio(_THIS, SDL_AudioSpec * spec);
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74
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75 /* GSXB callbacks */
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76 static void Mint_GsxbInterrupt(void);
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77 static void Mint_GsxbNullInterrupt(void);
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78
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79 /*--- Audio driver bootstrap functions ---*/
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80
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81 static int
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82 Audio_Available(void)
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83 {
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84 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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85
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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89 return (0);
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 16 bits audio */
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98 if ((cookie_snd & SND_16BIT) == 0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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100 return (0);
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101 }
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102
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103 /* Cookie GSXB present ? */
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104 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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106 /* Is it GSXB ? */
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107 if (((cookie_snd & SND_GSXB) == 0) || (cookie_gsxb == 0)) {
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108 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
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109 return (0);
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110 }
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111
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112 /* Check if audio is lockable */
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113 if (Locksnd() != 1) {
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114 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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115 return (0);
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116 }
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117
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118 Unlocksnd();
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119
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120 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
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121 return (1);
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122 }
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123
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124 static void
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125 Audio_DeleteDevice(SDL_AudioDevice * device)
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126 {
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127 SDL_free(device->hidden);
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128 SDL_free(device);
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129 }
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130
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131 static SDL_AudioDevice *
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132 Audio_CreateDevice(int devindex)
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133 {
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134 SDL_AudioDevice *this;
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135
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136 /* Initialize all variables that we clean on shutdown */
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137 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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138 if (this) {
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139 SDL_memset(this, 0, (sizeof *this));
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140 this->hidden = (struct SDL_PrivateAudioData *)
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141 SDL_malloc((sizeof *this->hidden));
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142 }
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143 if ((this == NULL) || (this->hidden == NULL)) {
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144 SDL_OutOfMemory();
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145 if (this) {
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146 SDL_free(this);
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147 }
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148 return (0);
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149 }
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150 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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151
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152 /* Set the function pointers */
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153 this->OpenAudio = Mint_OpenAudio;
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154 this->CloseAudio = Mint_CloseAudio;
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155 this->LockAudio = Mint_LockAudio;
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156 this->UnlockAudio = Mint_UnlockAudio;
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157 this->free = Audio_DeleteDevice;
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158
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159 return this;
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160 }
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161
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162 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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163 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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164 Audio_Available, Audio_CreateDevice
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165 };
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166
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167 static void
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168 Mint_LockAudio(_THIS)
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169 {
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170 /* Stop replay */
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171 Buffoper(0);
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172 }
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173
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174 static void
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175 Mint_UnlockAudio(_THIS)
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176 {
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177 /* Restart replay */
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178 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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179 }
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180
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181 static void
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182 Mint_CloseAudio(_THIS)
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183 {
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184 /* Stop replay */
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185 Buffoper(0);
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186
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187 /* Uninstall interrupt */
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188 if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt) < 0) {
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189 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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190 }
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191
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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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201
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202 /* Unlock sound system */
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203 Unlocksnd();
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204 }
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205
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206 static int
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207 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
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208 {
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209 long snd_format;
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210 int i, resolution, format_signed, format_bigendian;
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211
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212 resolution = spec->format & 0x00ff;
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213 format_signed = ((spec->format & 0x8000) != 0);
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214 format_bigendian = ((spec->format & 0x1000) != 0);
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215
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216 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", spec->format & 0x00ff));
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217 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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218 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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219 DEBUG_PRINT(("channels=%d, ", spec->channels));
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220 DEBUG_PRINT(("freq=%d\n", spec->freq));
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221
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222 /* Check formats available */
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223 snd_format = Sndstatus(SND_QUERYFORMATS);
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224 switch (resolution) {
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225 case 8:
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226 if ((snd_format & SND_FORMAT8) == 0) {
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227 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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228 return -1;
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229 }
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230 snd_format = Sndstatus(SND_QUERY8BIT);
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231 break;
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232 case 16:
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233 if ((snd_format & SND_FORMAT16) == 0) {
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234 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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235 return -1;
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236 }
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237 snd_format = Sndstatus(SND_QUERY16BIT);
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238 break;
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239 default:
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240 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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241 return -1;
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242 break;
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243 }
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244
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245 /* Check signed/unsigned format */
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246 if (format_signed) {
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247 if (snd_format & SND_FORMATSIGNED) {
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248 /* Ok */
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249 } else if (snd_format & SND_FORMATUNSIGNED) {
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250 /* Give unsigned format */
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251 spec->format = spec->format & (~0x8000);
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252 }
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253 } else {
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254 if (snd_format & SND_FORMATUNSIGNED) {
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255 /* Ok */
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256 } else if (snd_format & SND_FORMATSIGNED) {
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257 /* Give signed format */
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258 spec->format |= 0x8000;
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259 }
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260 }
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261
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262 if (format_bigendian) {
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263 if (snd_format & SND_FORMATBIGENDIAN) {
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264 /* Ok */
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265 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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266 /* Give little endian format */
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267 spec->format = spec->format & (~0x1000);
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268 }
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269 } else {
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270 if (snd_format & SND_FORMATLITTLEENDIAN) {
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271 /* Ok */
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272 } else if (snd_format & SND_FORMATBIGENDIAN) {
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273 /* Give big endian format */
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274 spec->format |= 0x1000;
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275 }
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276 }
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277
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278 /* Calculate and select the closest frequency */
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279 MINTAUDIO_freqcount = 0;
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280 for (i = 1; i < 4; i++) {
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281 SDL_MintAudio_AddFrequency(this,
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282 MASTERCLOCK_44K / (MASTERPREDIV_MILAN *
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283 (1 << i)),
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284 MASTERCLOCK_44K, (1 << i) - 1, -1);
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285 }
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286
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287 #if 1
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288 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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289 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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290 i, MINTAUDIO_frequencies[i].frequency,
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291 MINTAUDIO_frequencies[i].masterclock,
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292 MINTAUDIO_frequencies[i].predivisor));
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293 }
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294 #endif
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295
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296 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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297 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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298
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299 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", spec->format & 0x00ff));
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300 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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301 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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302 DEBUG_PRINT(("channels=%d, ", spec->channels));
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303 DEBUG_PRINT(("freq=%d\n", spec->freq));
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304
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305 return 0;
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306 }
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307
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308 static void
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309 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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310 {
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311 int channels_mode, prediv;
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312 void *buffer;
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313
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314 /* Stop currently playing sound */
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315 Buffoper(0);
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316
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317 /* Set replay tracks */
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318 Settracks(0, 0);
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319 Setmontracks(0);
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320
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321 /* Select replay format */
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322 switch (spec->format & 0xff) {
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323 case 8:
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324 if (spec->channels == 2) {
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325 channels_mode = STEREO8;
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326 } else {
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327 channels_mode = MONO8;
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328 }
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329 break;
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330 case 16:
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331 if (spec->channels == 2) {
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332 channels_mode = STEREO16;
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333 } else {
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334 channels_mode = MONO16;
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335 }
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336 break;
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337 default:
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338 channels_mode = STEREO16;
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339 break;
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340 }
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341 if (Setmode(channels_mode) < 0) {
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342 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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343 }
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344
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345 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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346 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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347
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348 /* Set buffer */
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349 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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350 if (Setbuffer(0, buffer, buffer + spec->size) < 0) {
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351 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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352 }
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353
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354 /* Install interrupt */
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355 if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt) < 0) {
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356 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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357 }
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358
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359 /* Go */
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360 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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361 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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362 }
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363
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364 static int
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365 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
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366 {
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367 /* Lock sound system */
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368 if (Locksnd() != 1) {
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369 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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370 return (-1);
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371 }
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372
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373 SDL_MintAudio_device = this;
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374
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375 /* Check audio capabilities */
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376 if (Mint_CheckAudio(this, spec) == -1) {
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377 return -1;
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378 }
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379
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380 SDL_CalculateAudioSpec(spec);
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381
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382 /* Allocate memory for audio buffers in DMA-able RAM */
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383 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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384
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385 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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386 if (SDL_MintAudio_audiobuf[0] == NULL) {
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387 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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388 return (-1);
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389 }
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390 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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391 SDL_MintAudio_numbuf = 0;
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392 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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393 SDL_MintAudio_audiosize = spec->size;
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394 SDL_MintAudio_mutex = 0;
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395
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396 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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397 SDL_MintAudio_audiobuf[0]));
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398 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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399 SDL_MintAudio_audiobuf[1]));
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400
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401 /* Setup audio hardware */
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402 Mint_InitAudio(this, spec);
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403
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404 return (1); /* We don't use threaded audio */
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405 }
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406
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407 static void
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408 Mint_GsxbInterrupt(void)
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409 {
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410 Uint8 *newbuf;
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411
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412 if (SDL_MintAudio_mutex)
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413 return;
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414
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415 SDL_MintAudio_mutex = 1;
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416
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417 SDL_MintAudio_numbuf ^= 1;
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418 SDL_MintAudio_Callback();
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419 newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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420 Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
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421
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422 SDL_MintAudio_mutex = 0;
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423 }
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424
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425 static void
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426 Mint_GsxbNullInterrupt(void)
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427 {
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428 }
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429
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430 /* vi: set ts=4 sw=4 expandtab: */