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annotate src/audio/mint/SDL_mintaudio_gsxb.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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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 #include "SDL_config.h"
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23
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24 /*
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25 MiNT audio driver
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26 using XBIOS functions (GSXB compatible driver)
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27
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28 Patrice Mandin
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29 */
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30
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31 /* Mint includes */
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32 #include <mint/osbind.h>
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33 #include <mint/falcon.h>
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34 #include <mint/cookie.h>
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35
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36 #include "SDL_audio.h"
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37 #include "../SDL_audio_c.h"
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38 #include "../SDL_sysaudio.h"
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39
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40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
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41
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42 #include "SDL_mintaudio.h"
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43 #include "SDL_mintaudio_gsxb.h"
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44
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45 /*--- Defines ---*/
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46
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47 #define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:gsxb: "
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51 #if 0
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52 #define DEBUG_PRINT(what) \
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53 { \
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54 printf what; \
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55 }
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56 #else
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57 #define DEBUG_PRINT(what)
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58 #endif
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59
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60 /*--- Static variables ---*/
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61
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62 static unsigned long cookie_snd, cookie_gsxb;
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63
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64 /*--- Audio driver functions ---*/
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65
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66 static void Mint_CloseAudio(_THIS);
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67 static int Mint_OpenAudio(_THIS, SDL_AudioSpec * spec);
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68 static void Mint_LockAudio(_THIS);
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69 static void Mint_UnlockAudio(_THIS);
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70
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71 /* To check/init hardware audio */
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72 static int Mint_CheckAudio(_THIS, SDL_AudioSpec * spec);
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73 static void Mint_InitAudio(_THIS, SDL_AudioSpec * spec);
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74
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75 /* GSXB callbacks */
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76 static void Mint_GsxbInterrupt(void);
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77 static void Mint_GsxbNullInterrupt(void);
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78
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79 /*--- Audio driver bootstrap functions ---*/
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80
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81 static int
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82 Audio_Available(void)
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83 {
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84 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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86 /* Check if user asked a different audio driver */
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87 if ((envr) && (SDL_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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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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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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103 /* Cookie GSXB present ? */
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104 cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
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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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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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124 static void
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125 Audio_DeleteDevice(SDL_AudioDevice * device)
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126 {
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127 SDL_free(device->hidden);
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128 SDL_free(device);
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129 }
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130
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131 static SDL_AudioDevice *
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132 Audio_CreateDevice(int devindex)
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133 {
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134 SDL_AudioDevice *this;
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135
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136 /* Initialize all variables that we clean on shutdown */
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137 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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138 if (this) {
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139 SDL_memset(this, 0, (sizeof *this));
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140 this->hidden = (struct SDL_PrivateAudioData *)
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141 SDL_malloc((sizeof *this->hidden));
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142 }
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143 if ((this == NULL) || (this->hidden == NULL)) {
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144 SDL_OutOfMemory();
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145 if (this) {
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146 SDL_free(this);
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147 }
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148 return (0);
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149 }
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150 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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151
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152 /* Set the function pointers */
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153 this->OpenAudio = Mint_OpenAudio;
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154 this->CloseAudio = Mint_CloseAudio;
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155 this->LockAudio = Mint_LockAudio;
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156 this->UnlockAudio = Mint_UnlockAudio;
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157 this->free = Audio_DeleteDevice;
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158
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159 return this;
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160 }
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161
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162 AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
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163 MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
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164 Audio_Available, Audio_CreateDevice
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165 };
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166
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167 static void
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168 Mint_LockAudio(_THIS)
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169 {
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170 /* Stop replay */
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171 Buffoper(0);
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172 }
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173
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174 static void
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175 Mint_UnlockAudio(_THIS)
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176 {
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177 /* Restart replay */
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178 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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179 }
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180
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181 static void
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182 Mint_CloseAudio(_THIS)
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183 {
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184 /* Stop replay */
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185 Buffoper(0);
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186
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187 /* Uninstall interrupt */
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188 if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt) < 0) {
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189 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
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190 }
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191
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192 /* Wait if currently playing sound */
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193 while (SDL_MintAudio_mutex != 0) {
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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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201
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202 /* Unlock sound system */
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203 Unlocksnd();
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204 }
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205
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206 static int
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207 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
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208 {
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209 long snd_format;
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210 int i, resolution, format_signed, format_bigendian;
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211
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212 resolution = spec->format & 0x00ff;
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213 format_signed = ((spec->format & 0x8000) != 0);
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214 format_bigendian = ((spec->format & 0x1000) != 0);
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215
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216 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", spec->format & 0x00ff));
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217 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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218 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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219 DEBUG_PRINT(("channels=%d, ", spec->channels));
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220 DEBUG_PRINT(("freq=%d\n", spec->freq));
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221
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222 /* Check formats available */
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223 snd_format = Sndstatus(SND_QUERYFORMATS);
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224 switch (resolution) {
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225 case 8:
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226 if ((snd_format & SND_FORMAT8) == 0) {
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227 SDL_SetError("Mint_CheckAudio: 8 bits samples not supported");
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228 return -1;
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229 }
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230 snd_format = Sndstatus(SND_QUERY8BIT);
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231 break;
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232 case 16:
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233 if ((snd_format & SND_FORMAT16) == 0) {
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234 SDL_SetError("Mint_CheckAudio: 16 bits samples not supported");
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235 return -1;
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236 }
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237 snd_format = Sndstatus(SND_QUERY16BIT);
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238 break;
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239 default:
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240 SDL_SetError("Mint_CheckAudio: Unsupported sample resolution");
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241 return -1;
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242 break;
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243 }
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244
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245 /* Check signed/unsigned format */
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246 if (format_signed) {
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247 if (snd_format & SND_FORMATSIGNED) {
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248 /* Ok */
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249 } else if (snd_format & SND_FORMATUNSIGNED) {
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250 /* Give unsigned format */
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251 spec->format = spec->format & (~0x8000);
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252 }
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253 } else {
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254 if (snd_format & SND_FORMATUNSIGNED) {
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255 /* Ok */
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256 } else if (snd_format & SND_FORMATSIGNED) {
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257 /* Give signed format */
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258 spec->format |= 0x8000;
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259 }
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260 }
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261
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262 if (format_bigendian) {
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263 if (snd_format & SND_FORMATBIGENDIAN) {
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264 /* Ok */
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265 } else if (snd_format & SND_FORMATLITTLEENDIAN) {
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266 /* Give little endian format */
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267 spec->format = spec->format & (~0x1000);
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268 }
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269 } else {
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270 if (snd_format & SND_FORMATLITTLEENDIAN) {
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271 /* Ok */
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272 } else if (snd_format & SND_FORMATBIGENDIAN) {
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273 /* Give big endian format */
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274 spec->format |= 0x1000;
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275 }
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276 }
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277
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278 /* Calculate and select the closest frequency */
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279 MINTAUDIO_freqcount = 0;
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280 for (i = 1; i < 4; i++) {
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281 SDL_MintAudio_AddFrequency(this,
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282 MASTERCLOCK_44K / (MASTERPREDIV_MILAN *
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283 (1 << i)),
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284 MASTERCLOCK_44K, (1 << i) - 1, -1);
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285 }
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286
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287 #if 1
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288 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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289 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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290 i, MINTAUDIO_frequencies[i].frequency,
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291 MINTAUDIO_frequencies[i].masterclock,
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292 MINTAUDIO_frequencies[i].predivisor));
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293 }
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294 #endif
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295
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296 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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297 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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298
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299 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", spec->format & 0x00ff));
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300 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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301 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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302 DEBUG_PRINT(("channels=%d, ", spec->channels));
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303 DEBUG_PRINT(("freq=%d\n", spec->freq));
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304
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305 return 0;
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306 }
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307
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308 static void
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309 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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310 {
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311 int channels_mode, prediv;
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312 void *buffer;
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313
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314 /* Stop currently playing sound */
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315 Buffoper(0);
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316
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317 /* Set replay tracks */
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318 Settracks(0, 0);
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319 Setmontracks(0);
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320
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321 /* Select replay format */
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322 switch (spec->format & 0xff) {
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323 case 8:
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324 if (spec->channels == 2) {
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325 channels_mode = STEREO8;
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326 } else {
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327 channels_mode = MONO8;
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328 }
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329 break;
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330 case 16:
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331 if (spec->channels == 2) {
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332 channels_mode = STEREO16;
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333 } else {
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334 channels_mode = MONO16;
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335 }
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336 break;
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337 default:
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338 channels_mode = STEREO16;
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339 break;
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340 }
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341 if (Setmode(channels_mode) < 0) {
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342 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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343 }
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344
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345 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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346 Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
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347
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348 /* Set buffer */
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349 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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350 if (Setbuffer(0, buffer, buffer + spec->size) < 0) {
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351 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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352 }
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353
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354 /* Install interrupt */
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355 if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt) < 0) {
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356 DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
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357 }
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358
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359 /* Go */
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360 Buffoper(SB_PLA_ENA | SB_PLA_RPT);
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361 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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362 }
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363
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364 static int
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365 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
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366 {
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367 /* Lock sound system */
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368 if (Locksnd() != 1) {
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369 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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370 return (-1);
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371 }
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372
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373 SDL_MintAudio_device = this;
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374
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375 /* Check audio capabilities */
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376 if (Mint_CheckAudio(this, spec) == -1) {
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377 return -1;
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378 }
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379
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380 SDL_CalculateAudioSpec(spec);
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381
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382 /* Allocate memory for audio buffers in DMA-able RAM */
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383 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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384
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385 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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386 if (SDL_MintAudio_audiobuf[0] == NULL) {
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387 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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388 return (-1);
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389 }
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390 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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391 SDL_MintAudio_numbuf = 0;
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392 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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393 SDL_MintAudio_audiosize = spec->size;
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394 SDL_MintAudio_mutex = 0;
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395
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396 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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397 SDL_MintAudio_audiobuf[0]));
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398 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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399 SDL_MintAudio_audiobuf[1]));
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400
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401 /* Setup audio hardware */
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402 Mint_InitAudio(this, spec);
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403
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404 return (1); /* We don't use threaded audio */
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405 }
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406
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407 static void
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408 Mint_GsxbInterrupt(void)
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409 {
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410 Uint8 *newbuf;
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411
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412 if (SDL_MintAudio_mutex)
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413 return;
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414
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415 SDL_MintAudio_mutex = 1;
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416
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417 SDL_MintAudio_numbuf ^= 1;
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418 SDL_MintAudio_Callback();
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419 newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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420 Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
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421
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422 SDL_MintAudio_mutex = 0;
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423 }
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424
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425 static void
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426 Mint_GsxbNullInterrupt(void)
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427 {
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428 }
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429
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430 /* vi: set ts=4 sw=4 expandtab: */