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annotate src/audio/mint/SDL_mintaudio_stfa.c @ 809:dba98fb391e7

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Date: Tue, 13 Jan 2004 19:25:37 +0300 From: Dmitry Yakimov Subject: [SDL] [PATCH] SDL bug patch Let me introduce 2 fixes to SDL. 1. Preventing great slowdown on fast machines while hardware flipping (it's obviously bug). 2. Setting up 85 Hz of monitor if supported. The reason is that Win98 by default sets lowest frequency 60 Hz. And we can't set up maximum frequency because some users can have wrong monitor drivers. This is important for shareware and commercial programs.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 11 Feb 2004 16:10:16 +0000
parents b8d311d90021
children 185acc07127a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 MiNT audio driver
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25 using XBIOS functions (STFA driver)
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26
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27 Patrice Mandin
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28 */
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29
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30 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 /* Mint includes */
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35 #include <mint/osbind.h>
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36 #include <mint/falcon.h>
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37 #include <mint/cookie.h>
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38
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39 #include "SDL_endian.h"
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40 #include "SDL_audio.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_audiomem.h"
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43 #include "SDL_sysaudio.h"
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44
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45 #include "SDL_atarimxalloc_c.h"
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46
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47 #include "SDL_mintaudio.h"
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48 #include "SDL_mintaudio_stfa.h"
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49
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50 /*--- Defines ---*/
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51
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52 #define MINT_AUDIO_DRIVER_NAME "mint_stfa"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:stfa: "
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56 #if 0
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57 #define DEBUG_PRINT(what) \
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58 { \
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59 printf what; \
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60 }
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61 #else
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62 #define DEBUG_PRINT(what)
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63 #endif
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64
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65 /*--- Static variables ---*/
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66
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67 static unsigned long cookie_snd, cookie_mch;
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68 static cookie_stfa_t *cookie_stfa;
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69
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70 static const int freqs[16]={
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71 4995, 6269, 7493, 8192,
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72 9830, 10971, 12538, 14985,
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73 16384, 19819, 21943, 24576,
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74 30720, 32336, 43885, 49152
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75 };
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76
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77 /*--- Audio driver functions ---*/
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78
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79 static void Mint_CloseAudio(_THIS);
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80 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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81 static void Mint_LockAudio(_THIS);
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82 static void Mint_UnlockAudio(_THIS);
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83
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84 /* To check/init hardware audio */
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85 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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86 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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87
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88 /*--- Audio driver bootstrap functions ---*/
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89
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90 static int Audio_Available(void)
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91 {
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92 const char *envr = getenv("SDL_AUDIODRIVER");
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93
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94 /* Check if user asked a different audio driver */
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95 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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96 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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97 return(0);
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98 }
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99
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100 /* Cookie _MCH present ? if not, assume ST machine */
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101 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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102 cookie_mch = MCH_ST;
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103 }
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104
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105 /* Cookie _SND present ? if not, assume ST machine */
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106 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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107 cookie_snd = SND_PSG;
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108 }
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109
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110 /* Cookie STFA present ? */
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111 if (Getcookie(C_STFA, (long *) &cookie_stfa) != C_FOUND) {
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112 DEBUG_PRINT((DEBUG_NAME "no STFA audio\n"));
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113 return(0);
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114 }
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115
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116 SDL_MintAudio_stfa = cookie_stfa;
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117
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118 DEBUG_PRINT((DEBUG_NAME "STFA audio available!\n"));
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119 return(1);
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120 }
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121
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122 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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123 {
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124 free(device->hidden);
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125 free(device);
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126 }
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127
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128 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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129 {
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130 SDL_AudioDevice *this;
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131
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132 /* Initialize all variables that we clean on shutdown */
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133 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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134 if ( this ) {
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135 memset(this, 0, (sizeof *this));
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136 this->hidden = (struct SDL_PrivateAudioData *)
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137 malloc((sizeof *this->hidden));
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138 }
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139 if ( (this == NULL) || (this->hidden == NULL) ) {
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140 SDL_OutOfMemory();
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141 if ( this ) {
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142 free(this);
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143 }
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144 return(0);
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145 }
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146 memset(this->hidden, 0, (sizeof *this->hidden));
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147
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148 /* Set the function pointers */
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149 this->OpenAudio = Mint_OpenAudio;
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150 this->CloseAudio = Mint_CloseAudio;
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151 this->LockAudio = Mint_LockAudio;
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152 this->UnlockAudio = Mint_UnlockAudio;
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diff changeset
153 this->free = Audio_DeleteDevice;
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154
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155 return this;
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diff changeset
156 }
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157
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diff changeset
158 AudioBootStrap MINTAUDIO_STFA_bootstrap = {
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diff changeset
159 MINT_AUDIO_DRIVER_NAME, "MiNT STFA audio driver",
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diff changeset
160 Audio_Available, Audio_CreateDevice
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diff changeset
161 };
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diff changeset
162
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diff changeset
163 static void Mint_LockAudio(_THIS)
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164 {
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165 void *oldpile;
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166
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167 /* Stop replay */
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168 oldpile=(void *)Super(0);
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169 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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170 Super(oldpile);
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171 }
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172
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173 static void Mint_UnlockAudio(_THIS)
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174 {
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175 void *oldpile;
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176
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177 /* Restart replay */
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178 oldpile=(void *)Super(0);
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179 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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180 Super(oldpile);
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181 }
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182
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183 static void Mint_CloseAudio(_THIS)
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184 {
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185 void *oldpile;
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186
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187 /* Stop replay */
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188 oldpile=(void *)Super(0);
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189 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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diff changeset
190 Super(oldpile);
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191
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diff changeset
192 /* Wait if currently playing sound */
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diff changeset
193 while (SDL_MintAudio_mutex != 0) {
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diff changeset
194 }
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195
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196 /* Clear buffers */
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197 if (SDL_MintAudio_audiobuf[0]) {
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198 Mfree(SDL_MintAudio_audiobuf[0]);
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199 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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200 }
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diff changeset
201 }
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202
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diff changeset
203 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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204 {
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diff changeset
205 int i;
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206
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207 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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208 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
209 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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210 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
211 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
212
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diff changeset
213 /* Check formats available */
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diff changeset
214 MINTAUDIO_nfreq=16;
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diff changeset
215 MINTAUDIO_sfreq=0;
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diff changeset
216 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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217 MINTAUDIO_hardfreq[i]=freqs[15-i];
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diff changeset
218 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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diff changeset
219 }
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diff changeset
220
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diff changeset
221 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 0, spec->freq);
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diff changeset
222 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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223
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diff changeset
224 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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225 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
226 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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diff changeset
227 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
228 DEBUG_PRINT(("freq=%d\n", spec->freq));
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229
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230 return 0;
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diff changeset
231 }
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diff changeset
232
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diff changeset
233 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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234 {
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diff changeset
235 void *buffer;
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diff changeset
236 void *oldpile;
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237
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diff changeset
238 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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diff changeset
239
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diff changeset
240 oldpile=(void *)Super(0);
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241
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diff changeset
242 /* Stop replay */
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diff changeset
243 cookie_stfa->sound_enable=STFA_PLAY_DISABLE;
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diff changeset
244
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diff changeset
245 /* Select replay format */
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diff changeset
246 cookie_stfa->sound_control = 15-MINTAUDIO_numfreq;
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diff changeset
247 if ((spec->format & 0xff)==8) {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
248 cookie_stfa->sound_control |= STFA_FORMAT_8BIT;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
249 } else {
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diff changeset
250 cookie_stfa->sound_control |= STFA_FORMAT_16BIT;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
251 }
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
252 if (spec->channels==2) {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
253 cookie_stfa->sound_control |= STFA_FORMAT_STEREO;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
254 } else {
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diff changeset
255 cookie_stfa->sound_control |= STFA_FORMAT_MONO;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
256 }
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
257 if ((spec->format & 0x8000)!=0) {
644
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
258 cookie_stfa->sound_control |= STFA_FORMAT_SIGNED;
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
259 } else {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
260 cookie_stfa->sound_control |= STFA_FORMAT_UNSIGNED;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
261 }
704
c4803992e09c Small bugfixes
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diff changeset
262 if ((spec->format & 0x1000)!=0) {
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
263 cookie_stfa->sound_control |= STFA_FORMAT_BIGENDIAN;
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
264 } else {
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
265 cookie_stfa->sound_control |= STFA_FORMAT_LITENDIAN;
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parents:
diff changeset
266 }
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
267
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diff changeset
268 /* Set buffer */
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diff changeset
269 cookie_stfa->sound_start = (unsigned long) buffer;
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diff changeset
270 cookie_stfa->sound_end = (unsigned long) (buffer + spec->size);
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parents:
diff changeset
271
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diff changeset
272 /* Set interrupt */
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diff changeset
273 cookie_stfa->stfa_it = SDL_MintAudio_StfaInterrupt;
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parents:
diff changeset
274
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
275 /* Restart replay */
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diff changeset
276 cookie_stfa->sound_enable=STFA_PLAY_ENABLE|STFA_PLAY_REPEAT;
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diff changeset
277
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diff changeset
278 Super(oldpile);
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diff changeset
279
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280 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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281 }
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diff changeset
282
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diff changeset
283 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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284 {
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diff changeset
285 SDL_MintAudio_device = this;
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286
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diff changeset
287 /* Check audio capabilities */
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diff changeset
288 if (Mint_CheckAudio(this, spec)==-1) {
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diff changeset
289 return -1;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
290 }
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diff changeset
291
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diff changeset
292 SDL_CalculateAudioSpec(spec);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
293
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
294 /* Allocate memory for audio buffers in DMA-able RAM */
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diff changeset
295 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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parents:
diff changeset
296
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
297 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
298 if (SDL_MintAudio_audiobuf[0]==NULL) {
594422ab8f9f Atari MiNT: added more audio drivers
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299 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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300 return (-1);
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301 }
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302 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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303 SDL_MintAudio_numbuf=0;
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304 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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305 SDL_MintAudio_audiosize = spec->size;
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306 SDL_MintAudio_mutex = 0;
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307
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308 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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309 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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310
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311 /* Setup audio hardware */
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312 Mint_InitAudio(this, spec);
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313
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314 return(1); /* We don't use threaded audio */
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315 }