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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 1097:c83fa1c650dd

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Move GSXB callback to C source
author Patrice Mandin <patmandin@gmail.com>
date Wed, 20 Jul 2005 17:44:11 +0000
parents 176240cf4405
children 856f76a099c7
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 (GSXB 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_gsxb.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_gsxb"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:gsxb: "
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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_gsxb;
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68
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69 /*--- Audio driver functions ---*/
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70
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71 static void Mint_CloseAudio(_THIS);
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72 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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73 static void Mint_LockAudio(_THIS);
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74 static void Mint_UnlockAudio(_THIS);
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75
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76 /* To check/init hardware audio */
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77 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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78 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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79
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80 /* GSXB callbacks */
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81 static void Mint_GsxbInterrupt(void);
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82 static void Mint_GsxbNullInterrupt(void);
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83
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84 /*--- Audio driver bootstrap functions ---*/
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85
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86 static int Audio_Available(void)
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87 {
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88 const char *envr = getenv("SDL_AUDIODRIVER");
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89
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90 /* Check if user asked a different audio driver */
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91 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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92 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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93 return(0);
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94 }
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95
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96 /* Cookie _SND present ? if not, assume ST machine */
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97 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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98 cookie_snd = SND_PSG;
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99 }
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100
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101 /* Check if we have 16 bits audio */
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102 if ((cookie_snd & SND_16BIT)==0) {
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103 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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104 return(0);
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105 }
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106
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107 /* Cookie GSXB present ? */
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108 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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109
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110 /* Is it GSXB ? */
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111 if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
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112 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
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113 return(0);
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114 }
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115
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116 /* Check if audio is lockable */
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117 if (Locksnd()!=1) {
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118 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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119 return(0);
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120 }
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121
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122 Unlocksnd();
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123
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124 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
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125 return(1);
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126 }
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127
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128 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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129 {
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130 free(device->hidden);
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131 free(device);
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132 }
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133
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134 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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135 {
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136 SDL_AudioDevice *this;
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137
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138 /* Initialize all variables that we clean on shutdown */
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139 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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140 if ( this ) {
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141 memset(this, 0, (sizeof *this));
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142 this->hidden = (struct SDL_PrivateAudioData *)
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143 malloc((sizeof *this->hidden));
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144 }
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145 if ( (this == NULL) || (this->hidden == NULL) ) {
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146 SDL_OutOfMemory();
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147 if ( this ) {
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148 free(this);
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149 }
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150 return(0);
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151 }
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diff changeset
152 memset(this->hidden, 0, (sizeof *this->hidden));
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153
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diff changeset
154 /* Set the function pointers */
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diff changeset
155 this->OpenAudio = Mint_OpenAudio;
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156 this->CloseAudio = Mint_CloseAudio;
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157 this->LockAudio = Mint_LockAudio;
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diff changeset
158 this->UnlockAudio = Mint_UnlockAudio;
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parents:
diff changeset
159 this->free = Audio_DeleteDevice;
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diff changeset
160
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diff changeset
161 return this;
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diff changeset
162 }
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diff changeset
163
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parents:
diff changeset
164 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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diff changeset
165 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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diff changeset
166 Audio_Available, Audio_CreateDevice
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diff changeset
167 };
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parents:
diff changeset
168
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diff changeset
169 static void Mint_LockAudio(_THIS)
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170 {
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parents:
diff changeset
171 /* Stop replay */
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diff changeset
172 Buffoper(0);
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diff changeset
173 }
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174
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diff changeset
175 static void Mint_UnlockAudio(_THIS)
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parents:
diff changeset
176 {
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parents:
diff changeset
177 /* Restart replay */
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parents:
diff changeset
178 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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diff changeset
179 }
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diff changeset
180
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diff changeset
181 static void Mint_CloseAudio(_THIS)
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182 {
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183 /* Stop replay */
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184 Buffoper(0);
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185
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diff changeset
186 /* Uninstall interrupt */
1097
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
187 if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt)<0) {
644
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188 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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189 }
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190
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diff changeset
191 /* Wait if currently playing sound */
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diff changeset
192 while (SDL_MintAudio_mutex != 0) {
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193 }
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194
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diff changeset
195 /* Clear buffers */
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196 if (SDL_MintAudio_audiobuf[0]) {
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parents:
diff changeset
197 Mfree(SDL_MintAudio_audiobuf[0]);
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diff changeset
198 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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parents:
diff changeset
199 }
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diff changeset
200
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diff changeset
201 /* Unlock sound system */
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diff changeset
202 Unlocksnd();
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203 }
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204
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205 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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206 {
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diff changeset
207 long snd_format;
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diff changeset
208 int i, resolution, format_signed, format_bigendian;
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209
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diff changeset
210 resolution = spec->format & 0x00ff;
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211 format_signed = ((spec->format & 0x8000)!=0);
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diff changeset
212 format_bigendian = ((spec->format & 0x1000)!=0);
704
c4803992e09c Small bugfixes
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parents: 644
diff changeset
213
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diff changeset
214 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
c4803992e09c Small bugfixes
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diff changeset
215 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
c4803992e09c Small bugfixes
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diff changeset
216 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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217 DEBUG_PRINT(("channels=%d, ", spec->channels));
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218 DEBUG_PRINT(("freq=%d\n", spec->freq));
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219
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diff changeset
220 /* Check formats available */
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diff changeset
221 snd_format = Sndstatus(SND_QUERYFORMATS);
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diff changeset
222 switch (resolution) {
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diff changeset
223 case 8:
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diff changeset
224 if ((snd_format & SND_FORMAT8)==0) {
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diff changeset
225 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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diff changeset
226 return -1;
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diff changeset
227 }
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diff changeset
228 snd_format = Sndstatus(SND_QUERY8BIT);
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diff changeset
229 break;
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diff changeset
230 case 16:
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diff changeset
231 if ((snd_format & SND_FORMAT16)==0) {
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diff changeset
232 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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diff changeset
233 return -1;
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diff changeset
234 }
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diff changeset
235 snd_format = Sndstatus(SND_QUERY16BIT);
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diff changeset
236 break;
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parents:
diff changeset
237 default:
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diff changeset
238 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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diff changeset
239 return -1;
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parents:
diff changeset
240 break;
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parents:
diff changeset
241 }
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parents:
diff changeset
242
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
243 /* Check signed/unsigned format */
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diff changeset
244 if (format_signed) {
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parents:
diff changeset
245 if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
246 /* Ok */
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parents:
diff changeset
247 } else if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
248 /* Give unsigned format */
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diff changeset
249 spec->format = spec->format & (~0x8000);
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diff changeset
250 }
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diff changeset
251 } else {
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parents:
diff changeset
252 if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
253 /* Ok */
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parents:
diff changeset
254 } else if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
255 /* Give signed format */
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parents:
diff changeset
256 spec->format |= 0x8000;
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diff changeset
257 }
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diff changeset
258 }
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parents:
diff changeset
259
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
260 if (format_bigendian) {
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parents:
diff changeset
261 if (snd_format & SND_FORMATBIGENDIAN) {
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parents:
diff changeset
262 /* Ok */
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diff changeset
263 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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parents:
diff changeset
264 /* Give little endian format */
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
265 spec->format = spec->format & (~0x1000);
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diff changeset
266 }
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diff changeset
267 } else {
704
c4803992e09c Small bugfixes
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parents: 644
diff changeset
268 if (snd_format & SND_FORMATLITTLEENDIAN) {
644
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diff changeset
269 /* Ok */
704
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diff changeset
270 } else if (snd_format & SND_FORMATBIGENDIAN) {
644
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diff changeset
271 /* Give big endian format */
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diff changeset
272 spec->format |= 0x1000;
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diff changeset
273 }
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diff changeset
274 }
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parents:
diff changeset
275
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diff changeset
276 /* Calculate and select the closest frequency */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
277 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
278 for (i=1;i<4;i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
279 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, (1<<i)-1);
644
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diff changeset
280 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
281
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
282 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
283 for (i=0; i<MINTAUDIO_freqcount; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
284 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
286 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
287 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
288 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
289 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
290
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
291 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
292 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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parents:
diff changeset
293
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
294 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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parents:
diff changeset
295 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
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parents: 644
diff changeset
296 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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diff changeset
297 DEBUG_PRINT(("channels=%d, ", spec->channels));
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parents:
diff changeset
298 DEBUG_PRINT(("freq=%d\n", spec->freq));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
299
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
300 return 0;
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301 }
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302
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303 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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304 {
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305 int channels_mode, prediv;
644
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306 void *buffer;
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307
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308 /* Stop currently playing sound */
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309 Buffoper(0);
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310
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311 /* Set replay tracks */
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312 Settracks(0,0);
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313 Setmontracks(0);
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314
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315 /* Select replay format */
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316 switch (spec->format & 0xff) {
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317 case 8:
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318 if (spec->channels==2) {
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319 channels_mode=STEREO8;
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320 } else {
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321 channels_mode=MONO8;
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322 }
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323 break;
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324 case 16:
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325 if (spec->channels==2) {
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326 channels_mode=STEREO16;
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327 } else {
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328 channels_mode=MONO16;
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329 }
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330 break;
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331 default:
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332 channels_mode=STEREO16;
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333 break;
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334 }
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335 if (Setmode(channels_mode)<0) {
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336 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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337 }
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338
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339 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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340 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
644
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341
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342 /* Set buffer */
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343 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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344 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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345 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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346 }
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347
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348 /* Install interrupt */
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349 if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt)<0) {
644
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350 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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351 }
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352
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353 /* Go */
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354 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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355 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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356 }
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357
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358 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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359 {
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360 /* Lock sound system */
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361 if (Locksnd()!=1) {
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362 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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363 return(-1);
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364 }
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365
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366 SDL_MintAudio_device = this;
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367
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368 /* Check audio capabilities */
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369 if (Mint_CheckAudio(this, spec)==-1) {
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370 return -1;
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371 }
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372
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373 SDL_CalculateAudioSpec(spec);
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374
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375 /* Allocate memory for audio buffers in DMA-able RAM */
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376 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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377
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378 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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diff changeset
379 if (SDL_MintAudio_audiobuf[0]==NULL) {
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380 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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381 return (-1);
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382 }
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383 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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384 SDL_MintAudio_numbuf=0;
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385 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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386 SDL_MintAudio_audiosize = spec->size;
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387 SDL_MintAudio_mutex = 0;
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diff changeset
388
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389 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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390 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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391
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parents:
diff changeset
392 /* Setup audio hardware */
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393 Mint_InitAudio(this, spec);
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394
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395 return(1); /* We don't use threaded audio */
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396 }
1097
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
397
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parents: 962
diff changeset
398 static void Mint_GsxbInterrupt(void)
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parents: 962
diff changeset
399 {
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diff changeset
400 Uint8 *newbuf;
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diff changeset
401
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
402 if (SDL_MintAudio_mutex)
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parents: 962
diff changeset
403 return;
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
404
c83fa1c650dd Move GSXB callback to C source
Patrice Mandin <patmandin@gmail.com>
parents: 962
diff changeset
405 SDL_MintAudio_mutex=1;
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
406
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
407 SDL_MintAudio_numbuf ^= 1;
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
408 SDL_MintAudio_Callback();
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
409 newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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parents: 962
diff changeset
410 Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
411
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
412 SDL_MintAudio_mutex=0;
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
413 }
c83fa1c650dd Move GSXB callback to C source
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parents: 962
diff changeset
414
c83fa1c650dd Move GSXB callback to C source
Patrice Mandin <patmandin@gmail.com>
parents: 962
diff changeset
415 static void Mint_GsxbNullInterrupt(void)
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parents: 962
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416 {
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diff changeset
417 }