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annotate src/audio/SDL_mixer_MMX_VC.c @ 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
parents 72ef7ce609ef
children b4117292e587
rev   line source
746
72ef7ce609ef Greatly simplified the SDL CPU info code
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1 #if defined(USE_ASM_MIXER_VC)
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2 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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3 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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4 // Converted to Intel ASM notation by Cth
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5 // This code is licensed under the LGPL (see COPYING for details)
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6 //
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7 // Assumes buffer size in bytes is a multiple of 16
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8 // Assumes SDL_MIX_MAXVOLUME = 128
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9
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10
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11 ////////////////////////////////////////////////
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12 // Mixing for 16 bit signed buffers
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13 ////////////////////////////////////////////////
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14
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15 #include <windows.h>
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16 #include <stdio.h>
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17
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18 void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
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19 {
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20 __asm
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21 {
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22 align 16
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23
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24 push edi
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25 push esi
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26 push ebx
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27
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28 mov edi, dst // edi = dst
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29 mov esi, src // esi = src
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30 mov eax, volume // eax = volume
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31 mov ebx, nSize // ebx = size
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32 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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33 jz endS16
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34
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35 pxor mm0, mm0
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36 movd mm0, eax //%%eax,%%mm0
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37 movq mm1, mm0 //%%mm0,%%mm1
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38 psllq mm0, 16 //$16,%%mm0
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39 por mm0, mm1 //%%mm1,%%mm0
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40 psllq mm0, 16 //$16,%%mm0
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41 por mm0, mm1 //%%mm1,%%mm0
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42 psllq mm0, 16 //$16,%%mm0
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43 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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44
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45 mixloopS16:
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46 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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47 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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48 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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49 // pre charger le buffer dst dans mm7
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50 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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51 // multiplier par le volume
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52 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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53 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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54 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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55 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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56 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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57 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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58 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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59 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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60 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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61 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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62 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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63 // pre charger le buffer dst dans mm5
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64 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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65 // diviser par 128
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66 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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67 add esi, 16 //$16,%%esi\n"
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68 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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69 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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70 // mm1 = le sample avec le volume modifie
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71 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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72 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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73 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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74 // mm4 = le sample avec le volume modifie
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75 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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76 movq [edi], mm3 //%%mm3,(%%edi)\n"
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77 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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78 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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79 add edi, 16 //$16,%%edi\n"
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80 dec ebx //%%ebx\n"
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81 jnz mixloopS16
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82
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83 ends16:
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84 emms
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85
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86 pop ebx
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87 pop esi
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88 pop edi
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89 }
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90
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91 }
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92
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93 ////////////////////////////////////////////////
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94 // Mixing for 8 bit signed buffers
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95 ////////////////////////////////////////////////
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96
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97 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
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98 {
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99 _asm
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100 {
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101 align 16
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102
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103 push edi
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104 push esi
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105 push ebx
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106
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107 mov edi, dst //movl %0,%%edi // edi = dst
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108 mov esi, src //%1,%%esi // esi = src
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109 mov eax, volume //%3,%%eax // eax = volume
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110
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111 movd mm0, ebx //%%ebx,%%mm0
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112 movq mm1, mm0 //%%mm0,%%mm1
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113 psllq mm0, 16 //$16,%%mm0
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114 por mm0, mm1 //%%mm1,%%mm0
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115 psllq mm0, 16 //$16,%%mm0
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116 por mm0, mm1 //%%mm1,%%mm0
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117 psllq mm0, 16 //$16,%%mm0
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118 por mm0, mm1 //%%mm1,%%mm0
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119
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120 mov ebx, nSize //%2,%%ebx // ebx = size
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121 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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122 cmp ebx, 0 //$0,%%ebx
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123 je endS8
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124
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125 mixloopS8:
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126 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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127 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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128 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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129 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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130 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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131 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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132 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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133 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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134 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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135 add esi, 8 //$8,%%esi
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136 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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137 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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138 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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139 packsswb mm3, mm1 //%%mm1,%%mm3 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128
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140 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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141 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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142 add edi, 8 //$8,%%edi
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143 dec ebx //%%ebx
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144 jnz mixloopS8
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145
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146 endS8:
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147 emms
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148
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149 pop ebx
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150 pop esi
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151 pop edi
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152 }
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153 }
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154
746
72ef7ce609ef Greatly simplified the SDL CPU info code
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155 #endif /* USE_ASM_MIXER_VC */