Mercurial > sdl-ios-xcode

annotate src/audio/mint/SDL_mintaudio_dma8.c @ 4001:6831b8723a85 SDL-1.2

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Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:24:36 +0000
parents e958a003b69b
children a1b03ba2fcd0
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 Audio_Available(void)
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78 {
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79 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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80
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81 /* Check if user asked a different audio driver */
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82 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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83 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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84 return 0;
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85 }
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86
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87 /* Cookie _MCH present ? if not, assume ST machine */
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88 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
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89 cookie_mch = MCH_ST;
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90 }
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91
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92 /* Cookie _SND present ? if not, assume ST machine */
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93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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94 cookie_snd = SND_PSG;
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95 }
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96
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97 /* Check if we have 8 bits audio */
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98 if ((cookie_snd & SND_8BIT)==0) {
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99 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
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100 return(0);
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101 }
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102
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103 /* Check if audio is lockable */
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104 if (cookie_snd & SND_16BIT) {
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105 if (Locksnd()!=1) {
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106 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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107 return(0);
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108 }
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109
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110 Unlocksnd();
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111 }
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112
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113 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
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114 return(1);
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115 }
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116
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117 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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118 {
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119 SDL_free(device->hidden);
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120 SDL_free(device);
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121 }
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122
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123 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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124 {
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125 SDL_AudioDevice *this;
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126
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127 /* Initialize all variables that we clean on shutdown */
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128 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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129 if ( this ) {
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130 SDL_memset(this, 0, (sizeof *this));
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131 this->hidden = (struct SDL_PrivateAudioData *)
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132 SDL_malloc((sizeof *this->hidden));
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133 }
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134 if ( (this == NULL) || (this->hidden == NULL) ) {
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135 SDL_OutOfMemory();
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136 if ( this ) {
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137 SDL_free(this);
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138 }
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139 return(0);
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140 }
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141 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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142
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143 /* Set the function pointers */
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144 this->OpenAudio = Mint_OpenAudio;
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145 this->CloseAudio = Mint_CloseAudio;
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146 this->LockAudio = Mint_LockAudio;
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147 this->UnlockAudio = Mint_UnlockAudio;
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diff changeset
148 this->free = Audio_DeleteDevice;
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149
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diff changeset
150 return this;
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parents:
diff changeset
151 }
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diff changeset
152
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parents:
diff changeset
153 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
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diff changeset
154 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
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diff changeset
155 Audio_Available, Audio_CreateDevice
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diff changeset
156 };
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diff changeset
157
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parents:
diff changeset
158 static void Mint_LockAudio(_THIS)
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parents:
diff changeset
159 {
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parents:
diff changeset
160 void *oldpile;
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parents:
diff changeset
161
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parents:
diff changeset
162 /* Stop replay */
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diff changeset
163 oldpile=(void *)Super(0);
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parents:
diff changeset
164 DMAAUDIO_IO.control=0;
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Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
165 Super(oldpile);
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Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
166 }
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diff changeset
167
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parents:
diff changeset
168 static void Mint_UnlockAudio(_THIS)
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parents:
diff changeset
169 {
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diff changeset
170 void *oldpile;
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diff changeset
171
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diff changeset
172 /* Restart replay */
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diff changeset
173 oldpile=(void *)Super(0);
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diff changeset
174 DMAAUDIO_IO.control=3;
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diff changeset
175 Super(oldpile);
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diff changeset
176 }
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diff changeset
177
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diff changeset
178 static void Mint_CloseAudio(_THIS)
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diff changeset
179 {
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diff changeset
180 void *oldpile;
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181
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diff changeset
182 /* Stop replay */
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diff changeset
183 oldpile=(void *)Super(0);
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diff changeset
184 DMAAUDIO_IO.control=0;
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diff changeset
185 Super(oldpile);
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diff changeset
186
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diff changeset
187 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
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188
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diff changeset
189 /* Disable interrupt */
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diff changeset
190 Jdisint(MFP_DMASOUND);
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191
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diff changeset
192 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
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diff changeset
193
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diff changeset
194 /* Wait if currently playing sound */
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diff changeset
195 while (SDL_MintAudio_mutex != 0) {
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
196 }
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diff changeset
197
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diff changeset
198 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
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199
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diff changeset
200 /* Clear buffers */
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parents:
diff changeset
201 if (SDL_MintAudio_audiobuf[0]) {
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parents:
diff changeset
202 Mfree(SDL_MintAudio_audiobuf[0]);
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
203 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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diff changeset
204 }
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parents:
diff changeset
205
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diff changeset
206 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
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diff changeset
207 }
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diff changeset
208
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diff changeset
209 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
210 {
961
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diff changeset
211 int i, masterprediv, sfreq;
644
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diff changeset
212 unsigned long masterclock;
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diff changeset
213
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diff changeset
214 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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diff changeset
215 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
216 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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diff changeset
217 DEBUG_PRINT(("channels=%d, ", spec->channels));
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diff changeset
218 DEBUG_PRINT(("freq=%d\n", spec->freq));
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diff changeset
219
3851
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1412
diff changeset
220 if (spec->channels > 2)
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
Ryan C. Gordon <icculus@icculus.org>
parents: 1412
diff changeset
221 spec->channels = 2;
405a192b68e7 Backport from 1.3: most of the audio drivers can now handle data
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parents: 1412
diff changeset
222
644
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diff changeset
223 /* Check formats available */
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diff changeset
224 spec->format = AUDIO_S8;
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diff changeset
225
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diff changeset
226 /* Calculate and select the closest frequency */
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diff changeset
227 sfreq=0;
644
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diff changeset
228 masterclock=MASTERCLOCK_STE;
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diff changeset
229 masterprediv=MASTERPREDIV_STE;
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parents:
diff changeset
230 switch(cookie_mch>>16) {
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parents:
diff changeset
231 /*
594422ab8f9f Atari MiNT: added more audio drivers
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diff changeset
232 case MCH_STE:
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diff changeset
233 masterclock=MASTERCLOCK_STE;
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diff changeset
234 masterprediv=MASTERPREDIV_STE;
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parents:
diff changeset
235 break;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
236 */
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parents:
diff changeset
237 case MCH_TT:
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diff changeset
238 masterclock=MASTERCLOCK_TT;
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parents:
diff changeset
239 masterprediv=MASTERPREDIV_TT;
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parents:
diff changeset
240 break;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
241 case MCH_F30:
1098
2911ff0a32bb Set MFP interrupt at end of frame
Patrice Mandin <patmandin@gmail.com>
parents: 962
diff changeset
242 case MCH_ARANYM:
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
243 masterclock=MASTERCLOCK_FALCON1;
961
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parents: 769
diff changeset
244 masterprediv=MASTERPREDIV_FALCON;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
245 sfreq=1;
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
246 break;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
247 }
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
248
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
249 MINTAUDIO_freqcount=0;
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
250 for (i=sfreq;i<4;i++) {
1107
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1098
diff changeset
251 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
856f76a099c7 Can use both clocks of FDI interface on Falcon, plus digital output
Patrice Mandin <patmandin@gmail.com>
parents: 1098
diff changeset
252 masterclock, i-sfreq, -1);
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
253 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
254
961
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
255 #if 1
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
256 for (i=0; i<MINTAUDIO_freqcount; i++) {
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
257 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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parents: 769
diff changeset
258 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
259 MINTAUDIO_frequencies[i].predivisor
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
260 ));
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
261 }
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
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diff changeset
262 #endif
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
263
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
264 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
185acc07127a Date: Fri, 29 Oct 2004 11:47:09 +0200
Patrice Mandin <patmandin@gmail.com>
parents: 769
diff changeset
265 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
266
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
267 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
268 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
c4803992e09c Small bugfixes
Patrice Mandin <patmandin@gmail.com>
parents: 644
diff changeset
269 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
270 DEBUG_PRINT(("channels=%d, ", spec->channels));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
271 DEBUG_PRINT(("freq=%d\n", spec->freq));
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
272
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
273 return 0;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
274 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
275
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
276 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
277 {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
278 void *oldpile;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
279 unsigned long buffer;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
280 unsigned char mode;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
281
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
282 /* Set replay tracks */
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
283 if (cookie_snd & SND_16BIT) {
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
284 Settracks(0,0);
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
285 Setmontracks(0);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
286 }
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
287
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
288 oldpile=(void *)Super(0);
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
289
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
290 /* Stop currently playing sound */
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
291 DMAAUDIO_IO.control=0;
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
292
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
293 /* Set buffer */
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
294 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
594422ab8f9f Atari MiNT: added more audio drivers
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parents:
diff changeset
295 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
594422ab8f9f Atari MiNT: added more audio drivers
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
296 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
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297 DMAAUDIO_IO.start_low = buffer & 255;
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298
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299 buffer += SDL_MintAudio_audiosize;
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300 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
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301 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
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302 DMAAUDIO_IO.end_low = buffer & 255;
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303
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304 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
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305 if (spec->channels==1) {
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306 mode |= 1<<7;
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307 }
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308 DMAAUDIO_IO.sound_ctrl = mode;
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309
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310 /* Set interrupt */
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311 Jdisint(MFP_DMASOUND);
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312 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
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313 Jenabint(MFP_DMASOUND);
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314
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315 if (cookie_snd & SND_16BIT) {
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316 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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317 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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318 }
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319 }
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320
644
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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;
1336
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diff changeset
348 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
644
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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 SDL_MintAudio_CheckFpu();
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356
644
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357 /* Setup audio hardware */
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358 Mint_InitAudio(this, spec);
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359
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360 return(1); /* We don't use threaded audio */
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361 }