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annotate src/audio/mint/SDL_mintaudio_mcsn.c @ 808:0defd90ef27c

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Simplify code and clean up Valgrind warning
author Sam Lantinga <slouken@libsdl.org>
date Wed, 11 Feb 2004 07:26:29 +0000
parents b8d311d90021
children 185acc07127a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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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 (MacSound compatible 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_mcsn.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_mcsn"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:mcsn: "
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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_mcsn_t *cookie_mcsn;
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69
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70 /*--- Audio driver functions ---*/
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71
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72 static void Mint_CloseAudio(_THIS);
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73 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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74 static void Mint_LockAudio(_THIS);
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75 static void Mint_UnlockAudio(_THIS);
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76
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77 /* To check/init hardware audio */
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78 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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79 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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80
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81 /*--- Audio driver bootstrap functions ---*/
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82
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83 static int Audio_Available(void)
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84 {
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85 const char *envr = getenv("SDL_AUDIODRIVER");
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86
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87 /* Check if user asked a different audio driver */
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88 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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89 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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90 return(0);
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91 }
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92
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93 /* Cookie _MCH present ? if not, assume ST machine */
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94 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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95 cookie_mch = MCH_ST;
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96 }
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97
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98 /* Cookie _SND present ? if not, assume ST machine */
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99 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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100 cookie_snd = SND_PSG;
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101 }
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102
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103 /* Check if we have 16 bits audio */
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104 if ((cookie_snd & SND_16BIT)==0) {
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105 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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106 return(0);
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107 }
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108
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109 /* Cookie MCSN present ? */
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110 if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
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111 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
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112 return(0);
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113 }
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114
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115 /* Check if interrupt at end of replay */
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116 if (cookie_mcsn->pint == 0) {
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117 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
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118 return(0);
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119 }
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120
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121 /* Check if audio is lockable */
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122 if (Locksnd()!=1) {
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123 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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124 return(0);
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125 }
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126
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127 Unlocksnd();
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128
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129 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
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130 return(1);
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131 }
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132
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133 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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134 {
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135 free(device->hidden);
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136 free(device);
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137 }
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138
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139 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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140 {
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141 SDL_AudioDevice *this;
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142
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143 /* Initialize all variables that we clean on shutdown */
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144 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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145 if ( this ) {
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146 memset(this, 0, (sizeof *this));
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147 this->hidden = (struct SDL_PrivateAudioData *)
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148 malloc((sizeof *this->hidden));
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149 }
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150 if ( (this == NULL) || (this->hidden == NULL) ) {
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151 SDL_OutOfMemory();
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parents:
diff changeset
152 if ( this ) {
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parents:
diff changeset
153 free(this);
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parents:
diff changeset
154 }
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parents:
diff changeset
155 return(0);
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parents:
diff changeset
156 }
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parents:
diff changeset
157 memset(this->hidden, 0, (sizeof *this->hidden));
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diff changeset
158
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parents:
diff changeset
159 /* Set the function pointers */
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parents:
diff changeset
160 this->OpenAudio = Mint_OpenAudio;
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parents:
diff changeset
161 this->CloseAudio = Mint_CloseAudio;
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parents:
diff changeset
162 this->LockAudio = Mint_LockAudio;
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parents:
diff changeset
163 this->UnlockAudio = Mint_UnlockAudio;
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parents:
diff changeset
164 this->free = Audio_DeleteDevice;
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parents:
diff changeset
165
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diff changeset
166 return this;
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diff changeset
167 }
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diff changeset
168
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parents:
diff changeset
169 AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
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diff changeset
170 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
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diff changeset
171 Audio_Available, Audio_CreateDevice
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diff changeset
172 };
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173
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diff changeset
174 static void Mint_LockAudio(_THIS)
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diff changeset
175 {
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diff changeset
176 /* Stop replay */
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diff changeset
177 Buffoper(0);
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178 }
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179
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diff changeset
180 static void Mint_UnlockAudio(_THIS)
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parents:
diff changeset
181 {
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diff changeset
182 /* Restart replay */
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diff changeset
183 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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184 }
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185
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diff changeset
186 static void Mint_CloseAudio(_THIS)
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187 {
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188 /* Stop replay */
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diff changeset
189 Buffoper(0);
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diff changeset
190
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diff changeset
191 /* Uninstall interrupt */
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diff changeset
192 Jdisint(MFP_DMASOUND);
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193
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diff changeset
194 /* Wait if currently playing sound */
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195 while (SDL_MintAudio_mutex != 0) {
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diff changeset
196 }
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diff changeset
197
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diff changeset
198 /* Clear buffers */
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diff changeset
199 if (SDL_MintAudio_audiobuf[0]) {
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diff changeset
200 Mfree(SDL_MintAudio_audiobuf[0]);
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diff changeset
201 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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diff changeset
202 }
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diff changeset
203
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diff changeset
204 /* Unlock sound system */
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diff changeset
205 Unlocksnd();
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diff changeset
206 }
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diff changeset
207
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diff changeset
208 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
209 {
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diff changeset
210 int i;
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diff changeset
211 unsigned long masterclock, masterprediv;
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diff changeset
212
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diff changeset
213 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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diff changeset
214 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
215 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
216 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
217 DEBUG_PRINT(("freq=%d\n", spec->freq));
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parents:
diff changeset
218
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diff changeset
219 /* Check formats available */
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diff changeset
220 MINTAUDIO_nfreq=4;
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diff changeset
221 MINTAUDIO_sfreq=0;
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diff changeset
222 switch(cookie_mcsn->play) {
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diff changeset
223 case MCSN_ST:
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diff changeset
224 spec->channels=1;
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diff changeset
225 spec->format=8; /* FIXME: is it signed or unsigned ? */
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diff changeset
226 MINTAUDIO_nfreq=1;
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diff changeset
227 MINTAUDIO_hardfreq[0]=12500;
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diff changeset
228 break;
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diff changeset
229 case MCSN_TT: /* Also STE, Mega STE */
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diff changeset
230 spec->format=AUDIO_S8;
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diff changeset
231 masterclock=MASTERCLOCK_STE;
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parents:
diff changeset
232 masterprediv=MASTERPREDIV_STE;
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parents:
diff changeset
233 if ((cookie_mch>>16)==MCH_TT) {
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parents:
diff changeset
234 masterclock=MASTERCLOCK_TT;
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parents:
diff changeset
235 masterprediv=MASTERPREDIV_TT;
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parents:
diff changeset
236 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
237 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
238 MINTAUDIO_hardfreq[i]=masterclock/(masterprediv*(1<<i));
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parents:
diff changeset
239 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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parents:
diff changeset
240 }
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parents:
diff changeset
241 break;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
242 case MCSN_FALCON: /* Also Mac */
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diff changeset
243 MINTAUDIO_nfreq=12;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
244 MINTAUDIO_sfreq=1;
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diff changeset
245 masterclock=MASTERCLOCK_FALCON1;
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parents:
diff changeset
246 if (cookie_mcsn->res1 != 0) {
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parents:
diff changeset
247 masterclock=cookie_mcsn->res1;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
248 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
249 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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parents:
diff changeset
250 MINTAUDIO_hardfreq[i]=masterclock/(MASTERPREDIV_FALCON*(i+1));
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diff changeset
251 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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parents:
diff changeset
252 }
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diff changeset
253 spec->format |= 0x8000; /* Audio is always signed */
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parents:
diff changeset
254 if ((spec->format & 0x00ff)==16) {
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parents:
diff changeset
255 spec->format |= 0x1000; /* Audio is always big endian */
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parents:
diff changeset
256 spec->channels=2; /* 16 bits always stereo */
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parents:
diff changeset
257 }
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parents:
diff changeset
258 break;
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parents:
diff changeset
259 }
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diff changeset
260
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parents:
diff changeset
261 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, (cookie_mch>>16)==MCH_F30, spec->freq);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
262 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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parents:
diff changeset
263
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
264 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
265 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
266 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
267 DEBUG_PRINT(("channels=%d, ", spec->channels));
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parents:
diff changeset
268 DEBUG_PRINT(("freq=%d\n", spec->freq));
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parents:
diff changeset
269
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diff changeset
270 return 0;
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parents:
diff changeset
271 }
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parents:
diff changeset
272
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diff changeset
273 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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parents:
diff changeset
274 {
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parents:
diff changeset
275 int channels_mode;
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diff changeset
276 void *buffer;
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parents:
diff changeset
277
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diff changeset
278 /* Stop currently playing sound */
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diff changeset
279 Buffoper(0);
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parents:
diff changeset
280
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parents:
diff changeset
281 /* Set replay tracks */
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diff changeset
282 Settracks(0,0);
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parents:
diff changeset
283 Setmontracks(0);
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parents:
diff changeset
284
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
285 /* Select replay format */
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parents:
diff changeset
286 channels_mode=STEREO16;
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parents:
diff changeset
287 switch (spec->format & 0xff) {
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Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
288 case 8:
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
289 if (spec->channels==2) {
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parents:
diff changeset
290 channels_mode=STEREO8;
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parents:
diff changeset
291 } else {
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parents:
diff changeset
292 channels_mode=MONO8;
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parents:
diff changeset
293 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
294 break;
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parents:
diff changeset
295 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
296 if (Setmode(channels_mode)<0) {
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parents:
diff changeset
297 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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parents:
diff changeset
298 }
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parents:
diff changeset
299
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
300 switch(cookie_mcsn->play) {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
301 case MCSN_TT:
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302 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
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303 Soundcmd(SETPRESCALE, 3-MINTAUDIO_numfreq);
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304 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
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305 break;
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306 case MCSN_FALCON:
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307 if (cookie_mcsn->res1 != 0) {
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308 Devconnect(DMAPLAY, DAC, CLKEXT, MINTAUDIO_numfreq, 1);
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309 DEBUG_PRINT((DEBUG_NAME "External clock selected, prescaler %d\n", MINTAUDIO_numfreq));
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310 } else {
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311 Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
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312 DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
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313 }
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314 break;
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315 }
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316
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317 /* Set buffer */
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318 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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319 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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320 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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321 }
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322
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323 /* Install interrupt */
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324 Jdisint(MFP_DMASOUND);
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325 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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326 Jenabint(MFP_DMASOUND);
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327
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328 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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329 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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330 }
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331
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332 /* Go */
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333 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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334 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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335 }
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336
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337 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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338 {
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339 /* Lock sound system */
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340 if (Locksnd()!=1) {
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341 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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342 return(-1);
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343 }
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344
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345 SDL_MintAudio_device = this;
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346
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347 /* Check audio capabilities */
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348 if (Mint_CheckAudio(this, spec)==-1) {
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349 return -1;
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350 }
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351
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352 SDL_CalculateAudioSpec(spec);
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353
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354 /* Allocate memory for audio buffers in DMA-able RAM */
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355 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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356
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357 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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358 if (SDL_MintAudio_audiobuf[0]==NULL) {
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359 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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360 return (-1);
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361 }
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362 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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363 SDL_MintAudio_numbuf=0;
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364 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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365 SDL_MintAudio_audiosize = spec->size;
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366 SDL_MintAudio_mutex = 0;
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367
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368 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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369 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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370
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371 /* Setup audio hardware */
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372 Mint_InitAudio(this, spec);
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373
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374 return(1); /* We don't use threaded audio */
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375 }