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annotate src/audio/mint/SDL_mintaudio_dma8.c @ 1012:f14e3059e138

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Date: Mon, 13 Dec 2004 21:28:18 -0500 From: Jonathan Atkins Subject: [SDL] SDL_SaveBMP width bugfix this fixes the pitch versus width difference that can happen (especially for 8bit and 24bit (with the exact RGBAmasks) surfaces) when you use SDL_SaveBMP. The problem was the pitch was used instead of the width, which in some cases is much wider than the screen area you really want to save...making for ugly crud on the saved image borders. This code has been tested with & without pitch overhangs...and with the right masks for 24 bit surfaces. I tested 8,15,16,24,32-0RGB,32-RGBA(with no SDL_SRCALPHA flag).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Dec 2004 06:20:49 +0000
parents 176240cf4405
children 2911ff0a32bb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /*
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24 MiNT audio driver
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25 using DMA 8bits (hardware access)
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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_dma8.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_dma8"
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53
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54 /* Debug print info */
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55 #define DEBUG_NAME "audio:dma8: "
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56 #if 0
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57 #define DEBUG_PRINT(what) \
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58 { \
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59 printf what; \
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60 }
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61 #else
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62 #define DEBUG_PRINT(what)
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63 #endif
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64
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65 /*--- Static variables ---*/
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66
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67 static unsigned long cookie_snd, cookie_mch;
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68
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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 _MCH present ? if not, assume ST machine */
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93 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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94 cookie_mch = MCH_ST;
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95 }
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96
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97 /* Cookie _SND present ? if not, assume ST machine */
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98 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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99 cookie_snd = SND_PSG;
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100 }
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101
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102 /* Check if we have 8 bits audio */
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103 /*
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104 if ((cookie_snd & SND_8BIT)==0) {
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105 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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106 return(0);
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107 }
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108 */
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109 if ((cookie_mch>>16)>MCH_F30) {
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110 DEBUG_PRINT((DEBUG_NAME "unknown 8 bits audio chip\n"));
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111 return 0;
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112 }
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113
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114 /* Check if audio is lockable */
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115 if ((cookie_mch>>16) == MCH_F30) {
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116 if (Locksnd()!=1) {
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117 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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118 return(0);
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119 }
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120
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121 Unlocksnd();
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122 }
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123
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124 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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125 return(1);
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126 }
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127
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128 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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129 {
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130 free(device->hidden);
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131 free(device);
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132 }
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133
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134 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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135 {
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136 SDL_AudioDevice *this;
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137
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138 /* Initialize all variables that we clean on shutdown */
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139 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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140 if ( this ) {
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141 memset(this, 0, (sizeof *this));
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142 this->hidden = (struct SDL_PrivateAudioData *)
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143 malloc((sizeof *this->hidden));
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144 }
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145 if ( (this == NULL) || (this->hidden == NULL) ) {
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146 SDL_OutOfMemory();
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147 if ( this ) {
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148 free(this);
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149 }
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150 return(0);
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diff changeset
151 }
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152 memset(this->hidden, 0, (sizeof *this->hidden));
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153
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diff changeset
154 /* Set the function pointers */
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155 this->OpenAudio = Mint_OpenAudio;
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156 this->CloseAudio = Mint_CloseAudio;
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157 this->LockAudio = Mint_LockAudio;
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158 this->UnlockAudio = Mint_UnlockAudio;
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159 this->free = Audio_DeleteDevice;
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160
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161 return this;
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162 }
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163
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164 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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165 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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166 Audio_Available, Audio_CreateDevice
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167 };
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168
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169 static void Mint_LockAudio(_THIS)
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170 {
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171 void *oldpile;
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172
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173 /* Stop replay */
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174 oldpile=(void *)Super(0);
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175 DMAAUDIO_IO.control=0;
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176 Super(oldpile);
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177 }
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178
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179 static void Mint_UnlockAudio(_THIS)
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180 {
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181 void *oldpile;
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182
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183 /* Restart replay */
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184 oldpile=(void *)Super(0);
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185 DMAAUDIO_IO.control=3;
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186 Super(oldpile);
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187 }
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188
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189 static void Mint_CloseAudio(_THIS)
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190 {
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191 void *oldpile;
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192
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193 /* Stop replay */
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194 oldpile=(void *)Super(0);
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195 DMAAUDIO_IO.control=0;
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196 Super(oldpile);
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197
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198 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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199
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200 /* Disable interrupt */
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201 Jdisint(MFP_DMASOUND);
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202
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203 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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204
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205 /* Wait if currently playing sound */
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206 while (SDL_MintAudio_mutex != 0) {
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207 }
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208
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209 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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210
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211 /* Clear buffers */
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212 if (SDL_MintAudio_audiobuf[0]) {
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213 Mfree(SDL_MintAudio_audiobuf[0]);
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214 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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215 }
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216
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217 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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218 }
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219
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220 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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221 {
961
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222 int i, masterprediv, sfreq;
644
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223 unsigned long masterclock;
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224
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225 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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226 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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227 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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228 DEBUG_PRINT(("channels=%d, ", spec->channels));
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229 DEBUG_PRINT(("freq=%d\n", spec->freq));
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230
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diff changeset
231 /* Check formats available */
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232 spec->format = AUDIO_S8;
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233
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234 /* Calculate and select the closest frequency */
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235 sfreq=0;
644
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236 masterclock=MASTERCLOCK_STE;
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237 masterprediv=MASTERPREDIV_STE;
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diff changeset
238 switch(cookie_mch>>16) {
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diff changeset
239 /*
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240 case MCH_STE:
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241 masterclock=MASTERCLOCK_STE;
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242 masterprediv=MASTERPREDIV_STE;
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243 break;
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244 */
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245 case MCH_TT:
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246 masterclock=MASTERCLOCK_TT;
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247 masterprediv=MASTERPREDIV_TT;
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248 break;
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diff changeset
249 case MCH_F30:
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diff changeset
250 masterclock=MASTERCLOCK_FALCON1;
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251 masterprediv=MASTERPREDIV_FALCON;
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diff changeset
252 sfreq=1;
644
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253 break;
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diff changeset
254 }
961
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255
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
256 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
257 for (i=sfreq;i<4;i++) {
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diff changeset
258 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), masterclock, i-sfreq);
644
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259 }
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diff changeset
260
961
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diff changeset
261 #if 1
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262 for (i=0; i<MINTAUDIO_freqcount; i++) {
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263 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
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diff changeset
264 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
265 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
266 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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267 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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268 #endif
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269
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270 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
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diff changeset
271 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
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272
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273 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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274 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
275 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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276 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
277 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
278
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279 return 0;
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280 }
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281
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282 static void 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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diff changeset
286 unsigned char mode;
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287
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diff changeset
288 /* Set replay tracks */
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diff changeset
289 if (cookie_snd & SND_16BIT) {
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diff changeset
290 Settracks(0,0);
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291 Setmontracks(0);
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diff changeset
292 }
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293
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294 oldpile=(void *)Super(0);
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295
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diff changeset
296 /* Stop currently playing sound */
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diff changeset
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 /* Go */
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322 DMAAUDIO_IO.control = 3; /* playback + repeat */
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323
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324 Super(oldpile);
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325 }
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326
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327 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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328 {
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329 SDL_MintAudio_device = this;
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330
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331 /* Check audio capabilities */
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332 if (Mint_CheckAudio(this, spec)==-1) {
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333 return -1;
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334 }
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335
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336 SDL_CalculateAudioSpec(spec);
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337
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338 /* Allocate memory for audio buffers in DMA-able RAM */
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339 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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340
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341 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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342 if (SDL_MintAudio_audiobuf[0]==NULL) {
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343 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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344 return (-1);
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345 }
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346 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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347 SDL_MintAudio_numbuf=0;
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348 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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349 SDL_MintAudio_audiosize = spec->size;
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350 SDL_MintAudio_mutex = 0;
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351
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352 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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353 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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354
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355 /* Setup audio hardware */
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356 Mint_InitAudio(this, spec);
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357
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358 return(1); /* We don't use threaded audio */
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359 }