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annotate src/audio/mint/SDL_mintaudio_it.S @ 956:4263beff9e38

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Date: Mon, 30 Aug 2004 18:20:25 +0200 From: Joost Baas Subject: why call arts artsc? I, and a few other people at the mplayer-docs-mailinglist were wondering why you decided to call arts artsc. I understand usually users have nothing to do with libsdl, just developers, but because you can choose the audio-driver being used by mplayer, one of which is sdl, and you can also choose the sdl subdriver, it is necessary to have a well-known or logical name. artsc is not the logical choice, and it's very hard to look up the right name if you don't know what you're looking for.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:25:06 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 Audio interrupts
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25
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26 Patrice Mandin
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27 */
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28
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29 .text
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30
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31 .globl _SDL_MintAudio_Callback
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32
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33 .globl _SDL_MintAudio_GsxbInterrupt
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34 .globl _SDL_MintAudio_EmptyGsxbInterrupt
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35 .globl _SDL_MintAudio_XbiosInterrupt
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36 .globl _SDL_MintAudio_Dma8Interrupt
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37 .globl _SDL_MintAudio_StfaInterrupt
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38
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39 .globl _SDL_MintAudio_mutex
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40 .globl _SDL_MintAudio_audiobuf
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41 .globl _SDL_MintAudio_numbuf
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42 .globl _SDL_MintAudio_audiosize
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43
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44 .globl _SDL_MintAudio_stfa
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45
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46 /*
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47 How it works:
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48 - Audio is playing buffer #0 (resp. #1)
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49 - We must calculate a sample in buffer #1 (resp. #0)
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50 so we first call the callback to do it
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51 - Then we swap the buffers
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52 */
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53
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54 /*--- GSXB interrupt vector ---*/
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55
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56 .text
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57 _SDL_MintAudio_GsxbInterrupt:
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58
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59 /* Check if we are not already running */
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60 tstw _SDL_MintAudio_mutex
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61 bnes _SDL_MintAudio_EmptyGsxbInterrupt
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62 notw _SDL_MintAudio_mutex
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63
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64 /* Swap buffers */
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65 eorw #1,_SDL_MintAudio_numbuf
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66
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67 moveml d0-d2/a0-a2,sp@-
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68
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69 /* Callback */
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70 jsr _SDL_MintAudio_Callback
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71
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72 /* Set new buffer */
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73
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74 moveq #0,d0
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75 movel _SDL_MintAudio_audiosize,d1
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76
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77 movew _SDL_MintAudio_numbuf,d0
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78 lsll #2,d0
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79 lea _SDL_MintAudio_audiobuf,a0
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80 movel a0@(d0:l),a1
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81
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82 lea a1@(d1:l),a2
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83
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84 movel a2,sp@-
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85 movel a1,sp@-
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86 clrw sp@-
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87 movew #131,sp@-
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88 trap #14
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89 lea sp@(12),sp
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91 moveml sp@+,d0-d2/a0-a2
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92
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93 clrw _SDL_MintAudio_mutex
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94 _SDL_MintAudio_EmptyGsxbInterrupt:
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95 rts
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96
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97 /*--- Xbios interrupt vector ---*/
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98
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99 _SDL_MintAudio_XbiosInterrupt:
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100
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101 /* Reenable interrupts, so other interrupts can work */
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102 movew #0x2300,sr
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103
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104 /* Clear service bit, so other MFP interrupts can work */
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105 bclr #5,0xfffffa0f:w
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106
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107 /* Check if we are not already running */
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108 tstw _SDL_MintAudio_mutex
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109 bnes SDL_MintAudio_XbiosEnd
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110 notw _SDL_MintAudio_mutex
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111
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112 /* Swap buffers */
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113 eorw #1,_SDL_MintAudio_numbuf
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114
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115 moveml d0-d2/a0-a2,sp@-
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116
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117 /* Callback */
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118 jsr _SDL_MintAudio_Callback
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119
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120 /* Set new buffer */
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121
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122 moveq #0,d0
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123 movel _SDL_MintAudio_audiosize,d1
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124
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125 movew _SDL_MintAudio_numbuf,d0
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126 lsll #2,d0
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127 lea _SDL_MintAudio_audiobuf,a0
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128 movel a0@(d0:l),a1
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130 lea a1@(d1:l),a2
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132 movel a2,sp@-
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133 movel a1,sp@-
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134 clrw sp@-
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135 movew #131,sp@-
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136 trap #14
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137 lea sp@(12),sp
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139 moveml sp@+,d0-d2/a0-a2
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140
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141 clrw _SDL_MintAudio_mutex
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142 SDL_MintAudio_XbiosEnd:
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143 rte
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144
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145 /*--- DMA 8 bits interrupt vector ---*/
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146
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147 _SDL_MintAudio_Dma8Interrupt:
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148
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149 /* Reenable interrupts, so other interrupts can work */
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150 movew #0x2300,sr
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151
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152 /* Clear service bit, so other MFP interrupts can work */
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153 bclr #5,0xfffffa0f:w
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154
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155 /* Check if we are not already running */
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156 tstw _SDL_MintAudio_mutex
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157 bnes SDL_MintAudio_Dma8End
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158 notw _SDL_MintAudio_mutex
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159
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160 /* Swap buffers */
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161 eorw #1,_SDL_MintAudio_numbuf
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162
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163 moveml d0-d1/a0-a1,sp@-
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164
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165 /* Callback */
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166 jsr _SDL_MintAudio_Callback
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167
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168 /* Set new buffer */
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169
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170 moveq #0,d0
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171
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172 movew _SDL_MintAudio_numbuf,d0
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173 lslw #2,d0
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174 lea _SDL_MintAudio_audiobuf,a0
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175 movel a0@(d0:w),d1
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176
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177 /* Modify DMA addresses */
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178 lea 0xffff8900:w,a0
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179
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180 moveb d1,a0@(0x07) /* Start address */
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181 rorl #8,d1
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182 moveb d1,a0@(0x05)
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183 rorl #8,d1
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184 moveb d1,a0@(0x03)
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185 swap d1
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186
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187 addl _SDL_MintAudio_audiosize,d1
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188
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189 moveb d1,a0@(0x13) /* End address */
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190 rorl #8,d1
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191 moveb d1,a0@(0x11)
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192 rorl #8,d1
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193 moveb d1,a0@(0x0f)
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194
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195 moveml sp@+,d0-d1/a0-a1
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196
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197 clrw _SDL_MintAudio_mutex
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198 SDL_MintAudio_Dma8End:
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199 rte
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200
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201 /*--- STFA interrupt vector ---*/
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202
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203 STFA_SOUND_START = 6
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204 STFA_SOUND_END = STFA_SOUND_START+8
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205
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206 _SDL_MintAudio_StfaInterrupt:
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207
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208 /* Reenable interrupts, so other interrupts can work */
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209 movew #0x2300,sr
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210
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211 /* Check if we are not already running */
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212 tstw _SDL_MintAudio_mutex
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213 bnes SDL_MintAudio_StfaEnd
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214 notw _SDL_MintAudio_mutex
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215
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216 /* Swap buffers */
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217 eorw #1,_SDL_MintAudio_numbuf
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218
644
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219 moveml d0-d1/a0-a1,sp@-
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220
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221 /* Callback */
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222 jsr _SDL_MintAudio_Callback
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223
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224 /* Set new buffer */
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225
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226 moveq #0,d0
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227 movel _SDL_MintAudio_stfa,a1
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228
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229 movew _SDL_MintAudio_numbuf,d0
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230 lslw #2,d0
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231 lea _SDL_MintAudio_audiobuf,a0
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232 movel a0@(d0:w),d1
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233
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234 /* Modify STFA replay buffers */
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235 movel d1,a1@(STFA_SOUND_START)
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236 addl _SDL_MintAudio_audiosize,d1
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237 movel d1,a1@(STFA_SOUND_END)
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238
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239 moveml sp@+,d0-d1/a0-a1
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240
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241 clrw _SDL_MintAudio_mutex
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242 SDL_MintAudio_StfaEnd:
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243 rte