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annotate src/audio/mint/SDL_mintaudio_xbios.c @ 1199:2d6dc7de1145

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From: Mike Frysinger <vapier@gentoo.org> To: sdl@libsdl.org Date: Sun, 11 Dec 2005 22:57:37 -0500 Subject: [SDL] exec stack in libsdl update i posted back in September a patch to remove executable stacks: http://www.devolution.com/pipermail/sdl/2005-September/070626.html later in November, a similar patch was merged it seems: http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm however, this lacks the additional output format checks that i posted in my patch ... this isnt a problem if the hermes asm code is only ever used to produce ELF objects, but if this is not true, then the additional checks in my original patch will need to be merged -mike
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 12 Dec 2005 09:13:12 +0000
parents 12c49532be00
children 3692456e7b0f
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
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23 /*
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24 MiNT audio driver
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25 using XBIOS functions (Falcon)
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26
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27 Patrice Mandin, Didier Méquignon
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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 #include <unistd.h>
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34 #include <support.h>
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35
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36 /* Mint includes */
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37 #include <mint/osbind.h>
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38 #include <mint/falcon.h>
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39 #include <mint/cookie.h>
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40
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41 #include "SDL_endian.h"
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42 #include "SDL_audio.h"
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43 #include "SDL_audio_c.h"
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44 #include "SDL_audiomem.h"
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45 #include "SDL_sysaudio.h"
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46
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47 #include "SDL_atarimxalloc_c.h"
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48
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49 #include "SDL_mintaudio.h"
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50 #include "SDL_mintaudio_dma8.h"
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51
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52 /*--- Defines ---*/
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53
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54 #define MINT_AUDIO_DRIVER_NAME "mint_xbios"
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55
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56 /* Debug print info */
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57 #define DEBUG_NAME "audio:xbios: "
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58 #if 0
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59 #define DEBUG_PRINT(what) \
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60 { \
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61 printf what; \
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62 }
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63 #else
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64 #define DEBUG_PRINT(what)
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65 #endif
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66
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67 /*--- Static variables ---*/
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68
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69 static unsigned long cookie_snd;
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70
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71 /*--- Audio driver functions ---*/
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72
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73 static void Mint_CloseAudio(_THIS);
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74 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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75 static void Mint_LockAudio(_THIS);
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76 static void Mint_UnlockAudio(_THIS);
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77
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78 /* To check/init hardware audio */
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79 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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80 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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81
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82 /*--- Audio driver bootstrap functions ---*/
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83
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84 static int Audio_Available(void)
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85 {
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86 unsigned long dummy;
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87 const char *envr = getenv("SDL_AUDIODRIVER");
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88
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89 SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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90
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91 /* We can't use XBIOS in interrupt with Magic, don't know about thread */
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92 if (Getcookie(C_MagX, &dummy) == C_FOUND) {
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93 return(0);
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94 }
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95
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96 /* Check if user asked a different audio driver */
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97 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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98 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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99 return(0);
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100 }
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101
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102 /* Cookie _SND present ? if not, assume ST machine */
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103 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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104 cookie_snd = SND_PSG;
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105 }
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106
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107 /* Check if we have 16 bits audio */
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108 if ((cookie_snd & SND_16BIT)==0) {
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109 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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110 return(0);
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111 }
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112
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113 /* Check if audio is lockable */
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114 if (Locksnd()!=1) {
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115 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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116 return(0);
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117 }
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118
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119 Unlocksnd();
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120
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121 DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
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122 return(1);
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123 }
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124
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125 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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126 {
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127 free(device->hidden);
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128 free(device);
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129 }
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130
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131 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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132 {
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133 SDL_AudioDevice *this;
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134
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135 /* Initialize all variables that we clean on shutdown */
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136 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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137 if ( this ) {
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138 memset(this, 0, (sizeof *this));
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139 this->hidden = (struct SDL_PrivateAudioData *)
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140 malloc((sizeof *this->hidden));
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141 }
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142 if ( (this == NULL) || (this->hidden == NULL) ) {
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143 SDL_OutOfMemory();
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144 if ( this ) {
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145 free(this);
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146 }
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diff changeset
147 return(0);
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parents:
diff changeset
148 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
149 memset(this->hidden, 0, (sizeof *this->hidden));
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parents:
diff changeset
150
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
151 /* Set the function pointers */
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parents:
diff changeset
152 this->OpenAudio = Mint_OpenAudio;
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parents:
diff changeset
153 this->CloseAudio = Mint_CloseAudio;
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parents:
diff changeset
154 this->LockAudio = Mint_LockAudio;
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
155 this->UnlockAudio = Mint_UnlockAudio;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
156 this->free = Audio_DeleteDevice;
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
157
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parents:
diff changeset
158 return this;
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parents:
diff changeset
159 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
160
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
161 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
162 MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
163 Audio_Available, Audio_CreateDevice
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
164 };
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
165
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
166 static void Mint_LockAudio(_THIS)
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
167 {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
168 /* Stop replay */
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
169 Buffoper(0);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
170 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
171
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
172 static void Mint_UnlockAudio(_THIS)
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
173 {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
174 /* Restart replay */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
175 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
176 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
177
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Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
178 static void Mint_CloseAudio(_THIS)
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
179 {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
180 /* Stop replay */
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
181 SDL_MintAudio_WaitThread();
644
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parents:
diff changeset
182 Buffoper(0);
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Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
183
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
184 if (!SDL_MintAudio_mint_present) {
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
185 /* Uninstall interrupt */
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
186 Jdisint(MFP_DMASOUND);
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
187 }
644
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
188
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
189 /* Wait if currently playing sound */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
190 while (SDL_MintAudio_mutex != 0) {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
191 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
192
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
193 /* Clear buffers */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
194 if (SDL_MintAudio_audiobuf[0]) {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
195 Mfree(SDL_MintAudio_audiobuf[0]);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
196 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
197 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
198
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
199 /* Unlock sound system */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
200 Unlocksnd();
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
201 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
202
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
203 /* Falcon XBIOS implementation of Devconnect() is buggy with external clock */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
204 static void Devconnect2(int src, int dst, int sclk, int pre)
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
205 {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
206 static const unsigned short MASK1[3] = { 0, 0x6000, 0 };
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
207 static const unsigned short MASK2[4] = { 0xFFF0, 0xFF8F, 0xF0FF, 0x0FFF };
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
208 static const unsigned short INDEX1[4] = { 1, 3, 5, 7 };
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
209 static const unsigned short INDEX2[4] = { 0, 2, 4, 6 };
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
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diff changeset
210 unsigned short sync_div,dev_ctrl,dest_ctrl;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
211 void *oldstack;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
212
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
213 if (dst==0) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
214 return;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
215 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
216
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
217 oldstack=(void *)Super(0);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
218
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
219 dev_ctrl = DMAAUDIO_IO.dev_ctrl;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
220 dest_ctrl = DMAAUDIO_IO.dest_ctrl;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
221 dev_ctrl &= MASK2[src];
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
222
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
223 if (src==ADC) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
224 dev_ctrl |= MASK1[sclk];
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
225 } else {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
226 dev_ctrl |= (INDEX1[sclk] << (src<<4));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
227 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
228
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
229 if (dst & DMAREC) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
230 dest_ctrl &= 0xFFF0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
231 dest_ctrl |= INDEX1[src];
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
232 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
233
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
234 if (dst & DSPRECV) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
235 dest_ctrl &= 0xFF8F;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
236 dest_ctrl |= (INDEX1[src]<<4);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
237 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
238
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
239 if (dst & EXTOUT) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
240 dest_ctrl &= 0xF0FF;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
241 dest_ctrl |= (INDEX1[src]<<8);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
242 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
243
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
244 if (dst & DAC) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
245 dev_ctrl &= 0x0FFF;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
246 dev_ctrl |= MASK1[sclk];
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
247 dest_ctrl &= 0x0FFF;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
248 dest_ctrl |= (INDEX2[src]<<12);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
249 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
250
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
251 sync_div = DMAAUDIO_IO.sync_div;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
252 if (sclk==CLKEXT) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
253 pre<<=8;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
254 sync_div &= 0xF0FF;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
255 } else {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
256 sync_div &= 0xFFF0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
257 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
258 sync_div |= pre;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
259
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
260 DMAAUDIO_IO.dev_ctrl = dev_ctrl;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
261 DMAAUDIO_IO.dest_ctrl = dest_ctrl;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
262 DMAAUDIO_IO.sync_div = sync_div;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
263
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
264 Super(oldstack);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
265 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
266
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
267 static void Mint_CheckExternalClock(_THIS)
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
268 {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
269 #define SIZE_BUF_CLOCK_MEASURE (44100/10)
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
270
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
271 unsigned long cookie_snd;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
272 char *buffer;
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
273 int i, j;
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
274
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
275 /* DSP present with its GPIO port ? */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
276 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
277 return;
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
278 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
279 if ((cookie_snd & SND_DSP)==0) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
280 return;
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
281 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
282
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
283 buffer = Atari_SysMalloc(SIZE_BUF_CLOCK_MEASURE, MX_STRAM);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
284 if (buffer==NULL) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
285 DEBUG_PRINT((DEBUG_NAME "Not enough memory for the measure\n"));
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
286 return;
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
287 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
288 memset(buffer, 0, SIZE_BUF_CLOCK_MEASURE);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
289
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
290 Buffoper(0);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
291 Settracks(0,0);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
292 Setmontracks(0);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
293 Setmode(MONO8);
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diff changeset
294 Jdisint(MFP_TIMERA);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
295
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diff changeset
296 for (i=0; i<2; i++) {
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diff changeset
297 Gpio(GPIO_SET,7); /* DSP port gpio outputs */
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diff changeset
298 Gpio(GPIO_WRITE,2+i); /* 22.5792/24.576 MHz for 44.1/48KHz */
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diff changeset
299 Devconnect2(DMAPLAY, DAC, CLKEXT, CLK50K); /* Matrix and clock source */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
300 Setbuffer(0, buffer, buffer + SIZE_BUF_CLOCK_MEASURE); /* Set buffer */
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diff changeset
301 Xbtimer(XB_TIMERA, 5, 38, SDL_MintAudio_XbiosInterruptMeasureClock); /* delay mode timer A, prediv /64, 1KHz */
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diff changeset
302 Jenabint(MFP_TIMERA);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
303 SDL_MintAudio_clocktics = 0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
304 Buffoper(SB_PLA_ENA);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
305 usleep(110000);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
306
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
307 if((Buffoper(-1) & 1)==0) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
308 if (SDL_MintAudio_clocktics) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
309 unsigned long khz;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
310
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
311 khz = ((SIZE_BUF_CLOCK_MEASURE/SDL_MintAudio_clocktics) +1) & 0xFFFFFFFE;
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diff changeset
312 DEBUG_PRINT((DEBUG_NAME "measure %d: freq=%lu KHz\n", i+1, khz));
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diff changeset
313
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diff changeset
314 if(khz==44) {
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diff changeset
315 for (j=1; j<4; j++) {
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diff changeset
316 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_44K, (1<<j)-1, 2+i);
961
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diff changeset
317 }
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318 } else if (khz==48) {
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diff changeset
319 for (j=1; j<4; j++) {
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diff changeset
320 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_48K/(MASTERPREDIV_FALCON*(1<<j)), MASTERCLOCK_48K, (1<<j)-1, 2+i);
961
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321 }
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322 }
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323 } else {
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diff changeset
324 DEBUG_PRINT((DEBUG_NAME "No measure\n"));
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325 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
326 } else {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
327 DEBUG_PRINT((DEBUG_NAME "No SDMA clock\n"));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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328 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
329
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diff changeset
330 Buffoper(0); /* stop */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
331 Jdisint(MFP_TIMERA); /* Uninstall interrupt */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
332 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
333
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
334 Mfree(buffer);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
335 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
336
644
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337 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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338 {
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diff changeset
339 int i;
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
340 Uint32 extclock;
644
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diff changeset
341
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diff changeset
342 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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diff changeset
343 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
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diff changeset
344 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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diff changeset
345 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
346 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
347
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diff changeset
348 spec->format |= 0x8000; /* Audio is always signed */
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diff changeset
349 if ((spec->format & 0x00ff)==16) {
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diff changeset
350 spec->format |= 0x1000; /* Audio is always big endian */
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diff changeset
351 spec->channels=2; /* 16 bits always stereo */
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352 }
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
353
1107
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diff changeset
354 MINTAUDIO_freqcount=0;
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diff changeset
355
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
356 /* Add external clocks if present */
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diff changeset
357 Mint_CheckExternalClock(this);
961
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diff changeset
358
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
359 /* Standard clocks */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
360 for (i=1;i<12;i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
361 /* Remove unusable Falcon codec predivisors */
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
362 if ((i==6) || (i==8) || (i==10)) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
363 continue;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
364 }
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
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diff changeset
365 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), MASTERCLOCK_FALCON1, i, -1);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
366 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
367
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
368 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
369 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
370 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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parents: 769
diff changeset
371 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
372 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
373 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
374 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
375 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
376
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
377 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
378 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
379
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
380 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
381 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
382 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
383 DEBUG_PRINT(("channels=%d, ", spec->channels));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
384 DEBUG_PRINT(("freq=%d\n", spec->freq));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
385
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
386 return 0;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
387 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
388
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
389 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
390 {
961
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diff changeset
391 int channels_mode, dmaclock, prediv;
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
392 void *buffer;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
393
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
394 /* Stop currently playing sound */
1111
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
395 SDL_MintAudio_quit_thread = SDL_FALSE;
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
396 SDL_MintAudio_thread_finished = SDL_TRUE;
12c49532be00 Use MiNT thread to update DMA pointers instead of unusable MFP interrupt
Patrice Mandin <patmandin@gmail.com>
parents: 1107
diff changeset
397 SDL_MintAudio_WaitThread();
644
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
398 Buffoper(0);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
399
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
400 /* Set replay tracks */
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
401 Settracks(0,0);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
402 Setmontracks(0);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
403
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
404 /* Select replay format */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
405 channels_mode=STEREO16;
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
406 switch (spec->format & 0xff) {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
407 case 8:
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
408 if (spec->channels==2) {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
409 channels_mode=STEREO8;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
410 } else {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
411 channels_mode=MONO8;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
412 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
413 break;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
414 }
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
415 if (Setmode(channels_mode)<0) {
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
416 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
417 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
418
961
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diff changeset
419 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
420 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
1107
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Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
421 if (MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits != -1) {
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
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diff changeset
422 Gpio(GPIO_SET,7); /* DSP port gpio outputs */
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
423 Gpio(GPIO_WRITE, MINTAUDIO_frequencies[MINTAUDIO_numfreq].gpio_bits);
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1106
diff changeset
424 Devconnect2(DMAPLAY, DAC|EXTOUT, CLKEXT, prediv);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
425 } else {
1100
76459577e620 Checking external clock on DSP port was leaving audio crossbar in limbo state
Patrice Mandin <patmandin@gmail.com>
parents: 1095
diff changeset
426 Devconnect2(DMAPLAY, DAC, CLK25M, prediv);
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
427 }
644
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
428
594422ab8f9f Atari MiNT: added more audio drivers
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429 /* Set buffer */
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430 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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431 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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432 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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433 }
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434
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435 if (SDL_MintAudio_mint_present) {
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436 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
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437 } else {
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438 /* Install interrupt */
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439 Jdisint(MFP_DMASOUND);
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440 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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441 Jenabint(MFP_DMASOUND);
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442
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443 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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444 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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445 }
644
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446 }
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447
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448 /* Go */
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449 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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450 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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451 }
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452
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453 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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454 {
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455 /* Lock sound system */
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456 if (Locksnd()!=1) {
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457 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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458 return(-1);
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459 }
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460
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461 SDL_MintAudio_device = this;
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462
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463 /* Check audio capabilities */
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464 if (Mint_CheckAudio(this, spec)==-1) {
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465 return -1;
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466 }
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467
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468 SDL_CalculateAudioSpec(spec);
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469
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470 /* Allocate memory for audio buffers in DMA-able RAM */
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471 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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472
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473 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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474 if (SDL_MintAudio_audiobuf[0]==NULL) {
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475 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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476 return (-1);
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477 }
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478 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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479 SDL_MintAudio_numbuf=0;
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480 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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481 SDL_MintAudio_audiosize = spec->size;
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482 SDL_MintAudio_mutex = 0;
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483
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484 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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485 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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486
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487 /* Setup audio hardware */
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488 Mint_InitAudio(this, spec);
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489
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490 return(1); /* We don't use SDL threaded audio */
644
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491 }