Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_m68k.c @ 4165:3b8ac3d311a2 SDL-1.2

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Hello. This patch provides basic support for video on the Sony PS3 Linux framebuffer. Scaling, format-conversion, and drawing is done from the SPEs, so there is little performance impact to PPE applications. This is by no means production quality code, but it is a very good start and a good example of how to use the PS3's hardware capabilities to accelerate video playback on the box. The driver has been verified to work with ffplay, mplayer and xine. This piece of software has been developed at the IBM R&D Lab in Boeblingen, Germany and is now returned to the community. Enjoy ! Signed-off-by: D.Herrendoerfer < d.herrendoerfer [at] de [dot] ibm [dot] com >
author Sam Lantinga <slouken@libsdl.org>
date Thu, 02 Apr 2009 04:06:55 +0000
parents a1b03ba2fcd0
children 124629b76853
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 m68k assembly mix routines
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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 #if defined(__M68000__) && defined(__GNUC__)
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31 void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
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32 {
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33 __asm__ __volatile__ (
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34
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35 "tstl %2\n"
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36 " beqs stoploop_u8\n"
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37 "mixloop_u8:\n"
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38
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39 /* Mix a sample */
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40
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41 " moveq #0,%%d0\n"
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42 " moveq #0,%%d1\n"
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43
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44 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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45 " sub #128,%%d0\n" /* d0 -= 128 */
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46 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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47 " moveb %0@,%%d1\n" /* d1 = *dst */
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48 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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49 " add #128,%%d0\n" /* d0 += 128 */
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50
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51 " add %%d1,%%d0\n"
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52
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53 " moveb %4@(%%d0:w),%0@+\n"
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54
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55 /* Loop till done */
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56
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57 " subql #1,%2\n"
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58 " bhis mixloop_u8\n"
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59 "stoploop_u8:\n"
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60
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61 : /* no return value */
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62 : /* input */
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63 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)
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64 : /* clobbered registers */
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65 "d0", "d1", "cc", "memory"
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66 );
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67 }
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68
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69 void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
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70 {
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71 __asm__ __volatile__ (
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72
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73 "tstl %2\n"
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74 " beqs stoploop_s8\n"
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75 " moveq #-128,%%d2\n"
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76 " moveq #127,%%d3\n"
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77 "mixloop_s8:\n"
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78
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79 /* Mix a sample */
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80
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81 " moveq #0,%%d0\n"
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82 " moveq #0,%%d1\n"
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83
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84 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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85 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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86 " moveb %0@,%%d1\n" /* d1 = *dst */
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87 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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88
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89 " add %%d1,%%d0\n"
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90
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91 " cmp %%d2,%%d0\n"
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92 " bges lower_limit_s8\n"
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93 " move %%d2,%%d0\n"
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94 "lower_limit_s8:\n"
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95
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96 " cmp %%d3,%%d0\n"
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97 " bles upper_limit_s8\n"
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98 " move %%d3,%%d0\n"
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99 "upper_limit_s8:\n"
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100 " moveb %%d0,%0@+\n"
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101
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102 /* Loop till done */
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103
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104 " subql #1,%2\n"
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105 " bhis mixloop_s8\n"
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106 "stoploop_s8:\n"
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107
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108 : /* no return value */
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109 : /* input */
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110 "a"(dst), "a"(src), "d"(len), "d"(volume)
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111 : /* clobbered registers */
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112 "d0", "d1", "d2", "d3", "cc", "memory"
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113 );
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114 }
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115
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116 void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
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117 {
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118 __asm__ __volatile__ (
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119
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120 "tstl %2\n"
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121 " beqs stoploop_s16msb\n"
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122 " movel #-32768,%%d2\n"
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123 " movel #32767,%%d3\n"
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124 " lsrl #1,%2\n"
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125 "mixloop_s16msb:\n"
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126
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127 /* Mix a sample */
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128
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129 " move %1@+,%%d0\n" /* d0 = *src++ */
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130 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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131 " move %0@,%%d1\n" /* d1 = *dst */
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132 " extl %%d1\n" /* extend d1 to 32 bits */
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133 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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134
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135 " addl %%d1,%%d0\n"
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136
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137 " cmpl %%d2,%%d0\n"
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138 " bges lower_limit_s16msb\n"
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139 " move %%d2,%%d0\n"
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140 "lower_limit_s16msb:\n"
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141
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142 " cmpl %%d3,%%d0\n"
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143 " bles upper_limit_s16msb\n"
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144 " move %%d3,%%d0\n"
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145 "upper_limit_s16msb:\n"
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146 " move %%d0,%0@+\n"
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147
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148 /* Loop till done */
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149
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150 " subql #1,%2\n"
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151 " bhis mixloop_s16msb\n"
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152 "stoploop_s16msb:\n"
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153
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154 : /* no return value */
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155 : /* input */
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156 "a"(dst), "a"(src), "d"(len), "d"(volume)
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157 : /* clobbered registers */
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158 "d0", "d1", "d2", "d3", "cc", "memory"
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159 );
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160 }
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161
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162 void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
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163 {
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164 __asm__ __volatile__ (
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165
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166 "tstl %2\n"
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167 " beqs stoploop_s16lsb\n"
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168 " movel #-32768,%%d2\n"
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169 " movel #32767,%%d3\n"
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170 " lsrl #1,%2\n"
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171 "mixloop_s16lsb:\n"
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172
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173 /* Mix a sample */
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174
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175 " move %1@+,%%d0\n" /* d0 = *src++ */
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176 " rorw #8,%%d0\n"
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177 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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178 " move %0@,%%d1\n" /* d1 = *dst */
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179 " rorw #8,%%d1\n"
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180 " extl %%d1\n" /* extend d1 to 32 bits */
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181 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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182
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183 " addl %%d1,%%d0\n"
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184
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185 " cmpl %%d2,%%d0\n"
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186 " bges lower_limit_s16lsb\n"
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187 " move %%d2,%%d0\n"
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188 "lower_limit_s16lsb:\n"
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189
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190 " cmpl %%d3,%%d0\n"
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191 " bles upper_limit_s16lsb\n"
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192 " move %%d3,%%d0\n"
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193 "upper_limit_s16lsb:\n"
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194 " rorw #8,%%d0\n"
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195 " move %%d0,%0@+\n"
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196
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197 /* Loop till done */
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198
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199 " subql #1,%2\n"
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200 " bhis mixloop_s16lsb\n"
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201 "stoploop_s16lsb:\n"
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202
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203 : /* no return value */
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204 : /* input */
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205 "a"(dst), "a"(src), "d"(len), "d"(volume)
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206 : /* clobbered registers */
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207 "d0", "d1", "d2", "d3", "cc", "memory"
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208 );
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209 }
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210 #endif
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211