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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 1029:f87f87efd45a

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Date: Mon, 17 Jan 2005 20:54:50 +0200 From: Ville [snip] Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter Hi, This patch removes the flicker filter option from the DirectFB backend's Matrox CRTC2 code in SDL. I will be removing the option from DirectFB (because it doesn't actually work) and that would cause the SDL code to fail without this fix. I was going to send this to some SDL list directly but libsdl.org is down so I'm not sure what if any lists there are. Thomas Jarosch (the guy who wrote the code) said you would accept SDL patches. Let me know if I should send this somewhere else. -- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 17 Jan 2005 19:38:28 +0000
parents 176240cf4405
children c83fa1c650dd
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 /*--- Audio driver bootstrap functions ---*/
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81
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82 static int Audio_Available(void)
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83 {
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84 const char *envr = getenv("SDL_AUDIODRIVER");
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85
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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88 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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89 return(0);
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 16 bits audio */
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98 if ((cookie_snd & SND_16BIT)==0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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100 return(0);
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101 }
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102
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103 /* Cookie GSXB present ? */
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104 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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105
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106 /* Is it GSXB ? */
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107 if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) {
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108 DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
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109 return(0);
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110 }
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111
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112 /* Check if audio is lockable */
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113 if (Locksnd()!=1) {
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114 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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115 return(0);
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116 }
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117
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118 Unlocksnd();
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119
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120 DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
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121 return(1);
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122 }
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123
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124 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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125 {
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126 free(device->hidden);
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127 free(device);
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128 }
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129
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130 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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131 {
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132 SDL_AudioDevice *this;
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133
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134 /* Initialize all variables that we clean on shutdown */
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135 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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136 if ( this ) {
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137 memset(this, 0, (sizeof *this));
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138 this->hidden = (struct SDL_PrivateAudioData *)
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139 malloc((sizeof *this->hidden));
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140 }
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141 if ( (this == NULL) || (this->hidden == NULL) ) {
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142 SDL_OutOfMemory();
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143 if ( this ) {
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144 free(this);
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145 }
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146 return(0);
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147 }
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148 memset(this->hidden, 0, (sizeof *this->hidden));
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149
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150 /* Set the function pointers */
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151 this->OpenAudio = Mint_OpenAudio;
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152 this->CloseAudio = Mint_CloseAudio;
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153 this->LockAudio = Mint_LockAudio;
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154 this->UnlockAudio = Mint_UnlockAudio;
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155 this->free = Audio_DeleteDevice;
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156
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157 return this;
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158 }
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diff changeset
159
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diff changeset
160 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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diff changeset
161 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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diff changeset
162 Audio_Available, Audio_CreateDevice
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diff changeset
163 };
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164
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165 static void Mint_LockAudio(_THIS)
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166 {
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diff changeset
167 /* Stop replay */
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168 Buffoper(0);
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169 }
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170
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171 static void Mint_UnlockAudio(_THIS)
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172 {
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diff changeset
173 /* Restart replay */
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parents:
diff changeset
174 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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175 }
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176
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diff changeset
177 static void Mint_CloseAudio(_THIS)
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178 {
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179 /* Stop replay */
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180 Buffoper(0);
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181
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diff changeset
182 /* Uninstall interrupt */
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183 if (NSetinterrupt(2, SI_NONE, SDL_MintAudio_EmptyGsxbInterrupt)<0) {
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184 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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185 }
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186
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187 /* Wait if currently playing sound */
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188 while (SDL_MintAudio_mutex != 0) {
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189 }
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190
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191 /* Clear buffers */
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192 if (SDL_MintAudio_audiobuf[0]) {
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193 Mfree(SDL_MintAudio_audiobuf[0]);
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194 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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195 }
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196
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197 /* Unlock sound system */
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198 Unlocksnd();
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199 }
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200
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201 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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202 {
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203 long snd_format;
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204 int i, resolution, format_signed, format_bigendian;
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205
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206 resolution = spec->format & 0x00ff;
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207 format_signed = ((spec->format & 0x8000)!=0);
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208 format_bigendian = ((spec->format & 0x1000)!=0);
704
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diff changeset
209
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diff changeset
210 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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diff changeset
211 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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diff changeset
212 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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213 DEBUG_PRINT(("channels=%d, ", spec->channels));
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214 DEBUG_PRINT(("freq=%d\n", spec->freq));
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215
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diff changeset
216 /* Check formats available */
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217 snd_format = Sndstatus(SND_QUERYFORMATS);
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diff changeset
218 switch (resolution) {
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diff changeset
219 case 8:
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diff changeset
220 if ((snd_format & SND_FORMAT8)==0) {
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diff changeset
221 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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diff changeset
222 return -1;
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diff changeset
223 }
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diff changeset
224 snd_format = Sndstatus(SND_QUERY8BIT);
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diff changeset
225 break;
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diff changeset
226 case 16:
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diff changeset
227 if ((snd_format & SND_FORMAT16)==0) {
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diff changeset
228 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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229 return -1;
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diff changeset
230 }
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diff changeset
231 snd_format = Sndstatus(SND_QUERY16BIT);
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diff changeset
232 break;
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diff changeset
233 default:
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diff changeset
234 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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235 return -1;
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parents:
diff changeset
236 break;
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parents:
diff changeset
237 }
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diff changeset
238
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parents:
diff changeset
239 /* Check signed/unsigned format */
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diff changeset
240 if (format_signed) {
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diff changeset
241 if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
242 /* Ok */
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parents:
diff changeset
243 } else if (snd_format & SND_FORMATUNSIGNED) {
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diff changeset
244 /* Give unsigned format */
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diff changeset
245 spec->format = spec->format & (~0x8000);
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diff changeset
246 }
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diff changeset
247 } else {
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parents:
diff changeset
248 if (snd_format & SND_FORMATUNSIGNED) {
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parents:
diff changeset
249 /* Ok */
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diff changeset
250 } else if (snd_format & SND_FORMATSIGNED) {
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parents:
diff changeset
251 /* Give signed format */
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diff changeset
252 spec->format |= 0x8000;
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diff changeset
253 }
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diff changeset
254 }
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diff changeset
255
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
256 if (format_bigendian) {
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parents:
diff changeset
257 if (snd_format & SND_FORMATBIGENDIAN) {
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parents:
diff changeset
258 /* Ok */
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diff changeset
259 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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diff changeset
260 /* Give little endian format */
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diff changeset
261 spec->format = spec->format & (~0x1000);
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diff changeset
262 }
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diff changeset
263 } else {
704
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parents: 644
diff changeset
264 if (snd_format & SND_FORMATLITTLEENDIAN) {
644
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diff changeset
265 /* Ok */
704
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diff changeset
266 } else if (snd_format & SND_FORMATBIGENDIAN) {
644
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diff changeset
267 /* Give big endian format */
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diff changeset
268 spec->format |= 0x1000;
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diff changeset
269 }
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diff changeset
270 }
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parents:
diff changeset
271
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diff changeset
272 /* Calculate and select the closest frequency */
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
273 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
274 for (i=1;i<4;i++) {
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diff changeset
275 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, (1<<i)-1);
644
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diff changeset
276 }
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parents:
diff changeset
277
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
278 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
279 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
280 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
281 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
282 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
283 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
284 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
285 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
286
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
287 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
288 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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parents:
diff changeset
289
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parents:
diff changeset
290 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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diff changeset
291 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
292 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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parents:
diff changeset
293 DEBUG_PRINT(("channels=%d, ", spec->channels));
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parents:
diff changeset
294 DEBUG_PRINT(("freq=%d\n", spec->freq));
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parents:
diff changeset
295
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
296 return 0;
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parents:
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297 }
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298
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299 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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300 {
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301 int channels_mode, prediv;
644
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302 void *buffer;
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303
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304 /* Stop currently playing sound */
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305 Buffoper(0);
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306
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307 /* Set replay tracks */
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308 Settracks(0,0);
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309 Setmontracks(0);
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310
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311 /* Select replay format */
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312 switch (spec->format & 0xff) {
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313 case 8:
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314 if (spec->channels==2) {
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315 channels_mode=STEREO8;
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316 } else {
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317 channels_mode=MONO8;
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318 }
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319 break;
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320 case 16:
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321 if (spec->channels==2) {
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322 channels_mode=STEREO16;
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323 } else {
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324 channels_mode=MONO16;
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325 }
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326 break;
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327 default:
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328 channels_mode=STEREO16;
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329 break;
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330 }
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331 if (Setmode(channels_mode)<0) {
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332 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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333 }
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334
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335 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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336 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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337
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338 /* Set buffer */
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339 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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340 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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341 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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342 }
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343
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344 /* Install interrupt */
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345 if (NSetinterrupt(2, SI_PLAY, SDL_MintAudio_GsxbInterrupt)<0) {
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346 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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347 }
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348
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349 /* Go */
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350 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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351 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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352 }
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353
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354 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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355 {
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356 /* Lock sound system */
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357 if (Locksnd()!=1) {
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358 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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359 return(-1);
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360 }
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361
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362 SDL_MintAudio_device = this;
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363
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364 /* Check audio capabilities */
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365 if (Mint_CheckAudio(this, spec)==-1) {
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366 return -1;
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367 }
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368
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369 SDL_CalculateAudioSpec(spec);
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370
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371 /* Allocate memory for audio buffers in DMA-able RAM */
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372 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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373
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374 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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375 if (SDL_MintAudio_audiobuf[0]==NULL) {
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376 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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377 return (-1);
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378 }
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379 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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380 SDL_MintAudio_numbuf=0;
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381 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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382 SDL_MintAudio_audiosize = spec->size;
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383 SDL_MintAudio_mutex = 0;
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384
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385 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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386 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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387
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388 /* Setup audio hardware */
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389 Mint_InitAudio(this, spec);
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390
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391 return(1); /* We don't use threaded audio */
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392 }