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annotate src/audio/mint/SDL_mintaudio_dma8.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 DMA 8bits (hardware access)
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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_dma8.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_dma8"
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48
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49 /* Debug print info */
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50 #define DEBUG_NAME "audio:dma8: "
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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_mch;
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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 /*--- Audio driver bootstrap functions ---*/
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76
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77 static int
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78 Audio_Available(void)
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79 {
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80 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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81
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82 /* Check if user asked a different audio driver */
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83 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME) != 0)) {
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84 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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85 return 0;
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86 }
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88 /* Cookie _MCH present ? if not, assume ST machine */
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89 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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90 cookie_mch = MCH_ST;
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91 }
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93 /* Cookie _SND present ? if not, assume ST machine */
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94 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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95 cookie_snd = SND_PSG;
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96 }
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98 /* Check if we have 8 bits audio */
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99 if ((cookie_snd & SND_8BIT) == 0) {
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100 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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101 return (0);
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102 }
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103
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104 /* Check if audio is lockable */
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105 if (cookie_snd & SND_16BIT) {
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106 if (Locksnd() != 1) {
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107 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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108 return (0);
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109 }
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110
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111 Unlocksnd();
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112 }
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114 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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115 return (1);
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116 }
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117
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118 static void
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119 Audio_DeleteDevice(SDL_AudioDevice * device)
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120 {
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121 SDL_free(device->hidden);
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122 SDL_free(device);
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123 }
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124
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125 static SDL_AudioDevice *
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126 Audio_CreateDevice(int devindex)
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127 {
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128 SDL_AudioDevice *this;
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129
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130 /* Initialize all variables that we clean on shutdown */
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131 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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132 if (this) {
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133 SDL_memset(this, 0, (sizeof *this));
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134 this->hidden = (struct SDL_PrivateAudioData *)
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135 SDL_malloc((sizeof *this->hidden));
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136 }
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137 if ((this == NULL) || (this->hidden == NULL)) {
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138 SDL_OutOfMemory();
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139 if (this) {
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140 SDL_free(this);
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141 }
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142 return (0);
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143 }
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144 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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145
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146 /* Set the function pointers */
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147 this->OpenAudio = Mint_OpenAudio;
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148 this->CloseAudio = Mint_CloseAudio;
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149 this->LockAudio = Mint_LockAudio;
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150 this->UnlockAudio = Mint_UnlockAudio;
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151 this->free = Audio_DeleteDevice;
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152
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153 return this;
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154 }
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155
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156 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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157 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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158 Audio_Available, Audio_CreateDevice
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159 };
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160
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161 static void
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162 Mint_LockAudio(_THIS)
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163 {
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164 void *oldpile;
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165
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166 /* Stop replay */
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167 oldpile = (void *) Super(0);
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168 DMAAUDIO_IO.control = 0;
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169 Super(oldpile);
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170 }
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171
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172 static void
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173 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 DMAAUDIO_IO.control = 3;
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180 Super(oldpile);
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181 }
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182
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183 static void
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184 Mint_CloseAudio(_THIS)
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185 {
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186 void *oldpile;
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187
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188 /* Stop replay */
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189 oldpile = (void *) Super(0);
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190 DMAAUDIO_IO.control = 0;
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191 Super(oldpile);
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192
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193 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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194
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195 /* Disable interrupt */
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196 Jdisint(MFP_DMASOUND);
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197
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198 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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199
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200 /* Wait if currently playing sound */
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201 while (SDL_MintAudio_mutex != 0) {
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202 }
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203
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204 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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205
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206 /* Clear buffers */
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207 if (SDL_MintAudio_audiobuf[0]) {
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208 Mfree(SDL_MintAudio_audiobuf[0]);
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209 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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210 }
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211
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212 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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213 }
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214
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215 static int
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216 Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
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217 {
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218 int i, masterprediv, sfreq;
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219 unsigned long masterclock;
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220
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221 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", spec->format & 0x00ff));
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222 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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223 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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224 DEBUG_PRINT(("channels=%d, ", spec->channels));
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225 DEBUG_PRINT(("freq=%d\n", spec->freq));
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226
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227 /* Check formats available */
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228 spec->format = AUDIO_S8;
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229
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230 /* Calculate and select the closest frequency */
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231 sfreq = 0;
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232 masterclock = MASTERCLOCK_STE;
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233 masterprediv = MASTERPREDIV_STE;
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234 switch (cookie_mch >> 16) {
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235 /*
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236 case MCH_STE:
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237 masterclock=MASTERCLOCK_STE;
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238 masterprediv=MASTERPREDIV_STE;
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239 break;
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240 */
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241 case MCH_TT:
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242 masterclock = MASTERCLOCK_TT;
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243 masterprediv = MASTERPREDIV_TT;
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244 break;
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245 case MCH_F30:
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246 case MCH_ARANYM:
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247 masterclock = MASTERCLOCK_FALCON1;
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248 masterprediv = MASTERPREDIV_FALCON;
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249 sfreq = 1;
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250 break;
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251 }
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252
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253 MINTAUDIO_freqcount = 0;
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254 for (i = sfreq; i < 4; i++) {
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255 SDL_MintAudio_AddFrequency(this,
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256 masterclock / (masterprediv * (1 << i)),
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257 masterclock, i - sfreq, -1);
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258 }
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259
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260 #if 1
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261 for (i = 0; i < MINTAUDIO_freqcount; i++) {
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262 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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263 i, MINTAUDIO_frequencies[i].frequency,
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264 MINTAUDIO_frequencies[i].masterclock,
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265 MINTAUDIO_frequencies[i].predivisor));
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266 }
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267 #endif
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268
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269 MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
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270 spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
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271
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272 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", spec->format & 0x00ff));
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273 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000) != 0)));
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274 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000) != 0)));
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275 DEBUG_PRINT(("channels=%d, ", spec->channels));
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276 DEBUG_PRINT(("freq=%d\n", spec->freq));
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277
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278 return 0;
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279 }
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280
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281 static void
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282 Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
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283 {
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284 void *oldpile;
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285 unsigned long buffer;
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286 unsigned char mode;
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287
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288 /* Set replay tracks */
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289 if (cookie_snd & SND_16BIT) {
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290 Settracks(0, 0);
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291 Setmontracks(0);
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292 }
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293
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294 oldpile = (void *) Super(0);
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295
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296 /* Stop currently playing sound */
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297 DMAAUDIO_IO.control = 0;
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298
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299 /* Set buffer */
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300 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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301 DMAAUDIO_IO.start_high = (buffer >> 16) & 255;
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302 DMAAUDIO_IO.start_mid = (buffer >> 8) & 255;
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303 DMAAUDIO_IO.start_low = buffer & 255;
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304
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305 buffer += SDL_MintAudio_audiosize;
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306 DMAAUDIO_IO.end_high = (buffer >> 16) & 255;
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307 DMAAUDIO_IO.end_mid = (buffer >> 8) & 255;
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308 DMAAUDIO_IO.end_low = buffer & 255;
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309
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310 mode = 3 - MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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311 if (spec->channels == 1) {
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312 mode |= 1 << 7;
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313 }
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314 DMAAUDIO_IO.sound_ctrl = mode;
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315
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316 /* Set interrupt */
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317 Jdisint(MFP_DMASOUND);
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318 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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319 Jenabint(MFP_DMASOUND);
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320
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321 if (cookie_snd & SND_16BIT) {
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322 if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {
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323 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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324 }
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325 }
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326
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327 /* Go */
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328 DMAAUDIO_IO.control = 3; /* playback + repeat */
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329
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330 Super(oldpile);
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331 }
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332
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333 static int
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334 Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
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335 {
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336 SDL_MintAudio_device = this;
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337
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338 /* Check audio capabilities */
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339 if (Mint_CheckAudio(this, spec) == -1) {
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340 return -1;
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341 }
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342
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343 SDL_CalculateAudioSpec(spec);
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344
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345 /* Allocate memory for audio buffers in DMA-able RAM */
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346 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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347
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348 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size * 2, MX_STRAM);
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349 if (SDL_MintAudio_audiobuf[0] == NULL) {
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350 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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351 return (-1);
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352 }
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353 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size;
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354 SDL_MintAudio_numbuf = 0;
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355 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size * 2);
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356 SDL_MintAudio_audiosize = spec->size;
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357 SDL_MintAudio_mutex = 0;
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358
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359 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n",
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360 SDL_MintAudio_audiobuf[0]));
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361 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n",
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362 SDL_MintAudio_audiobuf[1]));
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363
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364 /* Setup audio hardware */
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365 Mint_InitAudio(this, spec);
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366
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367 return (1); /* We don't use threaded audio */
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368 }
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369
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370 /* vi: set ts=4 sw=4 expandtab: */