annotate test/install-sh @ 942:41a59de7f2ed

Here are patches for SDL12 and SDL_mixer for 4 or 6 channel surround sound on Linux using the Alsa driver. To use them, naturally you need a sound card that will do 4 or 6 channels and probably also a recent version of the Alsa drivers and library. Since the only SDL output driver that knows about surround sound is the Alsa driver, you���ll want to choose it, using: export SDL_AUDIODRIVER=alsa There are no syntactic changes to the programming API. No new library calls, no differences in arguments. There are two semantic changes: (1) For library calls with number of channels as an argument, formerly you could use only 1 or 2 for the number of channels. Now you can also use 4 or 6. (2) The two "left" and "right" arguments to Mix_SetPanning, for the case of 4 or 6 channels, no longer simply control the volumes of the left and right channels. Now the "left" argument is converted to an angle and Mix_SetPosition is called, and the "right" argu- ment is ignored. With two exceptions, so far as I know, the modified SDL12 and SDL_mixer work the same way as the original versions, when opened for 1 or 2 channel output. The two exceptions are bugs which I fixed. Well, the first, anyway, is a bug for sure. When rate conversions up or down by a factor of two are applied (in src/audio/SDL_audiocvt.c), streams with different numbers of channels (that is, mono and stereo) are treated the same way: either each sample is copied or every other sample is omitted. This is ok for mono, but for stereo, it is frames that should be copied or omitted, where by "frame" I mean a portion of the stream containing one sample for each channel. (In the SDL source, confusingly, sometimes frames are called "samples".) So for these rate conversions, stereo streams have to be treated differently, and they are, in my modified version. The other problem that might be characterized as a bug arises when SDL_mixer is passed a multichannel chunk which does not have an integral number of frames. Due to the way the effect_position code loops over frames, when the chunk ends with a partial frame, memory outside the chunk buffer will be accessed. In the case of stereo, it���s possible that because malloc may give more memory than requested, this potential problem never actually causes a segment fault. I don���t know. For 6 channel chunks, I do know, and it does cause segment faults. If SDL_mixer is passed defective chunks and this causes a segment fault, arguably, that���s not a bug in SDL_mixer. Still, whether or not it counts as a bug, it���s easy to protect against, so why not? I added code in mixer.c to discard any partial frame at the end of a chunk. Then what about when SDL or SDL_mixer is opened for 4 or 6 chan- nel output? What happens with the parts of the current library designed for stereo? I don���t know whether I���ve covered all the bases, but I���ve tried: (1) For playing 2 channel waves, or other cases where SDL knows it has to match up a 2 channel source with a 4 or 6 channel output, I���ve added code in SDL_audiocvt.c to make the necessary conversions. (2) For playing midis using timidity, I���ve converted timidity to do 4 or 6 channel output, upon request. (3) For playing mods using mikmod, I put ad hoc code in music.c to convert the stereo output that mikmod produces to 4 or 6 chan- nels. Obviously it would be better to change the mikmod code to mix down into 4 or 6 channels, but I have a hard time following the code in mikmod, so I didn���t do that. (4) For playing mp3s, I put ad hoc code in smpeg to copy channels in the case when 4 or 6 channel output is needed. (5) There seems to be no problem with .ogg files - stereo .oggs can be up converted as .wavs are. (6) The effect_position code in SDL_mixer is now generalized to in- clude the cases of 4 and 6 channel streams. I���ve done a very limited amount of compatibility testing for some of the games using SDL I happen to have. For details, see the file TESTS. I���ve put into a separate archive, Surround-SDL-testfiles.tgz, a couple of 6 channel wave files for testing and a 6 channel ogg file. If you have the right hardware and version of Alsa, you should be able to play the wave files with the Alsa utility aplay (and hear all channels, except maybe lfe, for chan-id.wav, since it���s rather faint). Don���t expect aplay to give good sound, though. There���s something wrong with the current version of aplay. The canyon.ogg file is to test loading of 6 channel oggs. After patching and compiling, you can play it with playmus. (My version of ogg123 will not play it, and I had to patch mplayer to get it to play 6 channel oggs.) Greg Lee <greg@ling.lll.hawaii.edu> Thus, July 1, 2004
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 12:27:02 +0000
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1 #!/bin/sh
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2 #
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3 # install - install a program, script, or datafile
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4 # This comes from X11R5 (mit/util/scripts/install.sh).
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5 #
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6 # Copyright 1991 by the Massachusetts Institute of Technology
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7 #
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8 # Permission to use, copy, modify, distribute, and sell this software and its
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9 # documentation for any purpose is hereby granted without fee, provided that
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10 # the above copyright notice appear in all copies and that both that
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11 # copyright notice and this permission notice appear in supporting
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12 # documentation, and that the name of M.I.T. not be used in advertising or
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13 # publicity pertaining to distribution of the software without specific,
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14 # written prior permission. M.I.T. makes no representations about the
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15 # suitability of this software for any purpose. It is provided "as is"
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16 # without express or implied warranty.
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17 #
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18 # Calling this script install-sh is preferred over install.sh, to prevent
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19 # `make' implicit rules from creating a file called install from it
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20 # when there is no Makefile.
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21 #
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22 # This script is compatible with the BSD install script, but was written
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23 # from scratch. It can only install one file at a time, a restriction
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24 # shared with many OS's install programs.
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25
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26
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27 # set DOITPROG to echo to test this script
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28
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29 # Don't use :- since 4.3BSD and earlier shells don't like it.
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30 doit="${DOITPROG-}"
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31
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32
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33 # put in absolute paths if you don't have them in your path; or use env. vars.
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34
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35 mvprog="${MVPROG-mv}"
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36 cpprog="${CPPROG-cp}"
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37 chmodprog="${CHMODPROG-chmod}"
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38 chownprog="${CHOWNPROG-chown}"
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39 chgrpprog="${CHGRPPROG-chgrp}"
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40 stripprog="${STRIPPROG-strip}"
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41 rmprog="${RMPROG-rm}"
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42 mkdirprog="${MKDIRPROG-mkdir}"
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43
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44 transformbasename=""
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45 transform_arg=""
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46 instcmd="$mvprog"
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47 chmodcmd="$chmodprog 0755"
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48 chowncmd=""
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49 chgrpcmd=""
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50 stripcmd=""
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51 rmcmd="$rmprog -f"
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52 mvcmd="$mvprog"
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53 src=""
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54 dst=""
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55 dir_arg=""
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56
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57 while [ x"$1" != x ]; do
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58 case $1 in
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59 -c) instcmd="$cpprog"
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60 shift
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61 continue;;
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62
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63 -d) dir_arg=true
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64 shift
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65 continue;;
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66
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67 -m) chmodcmd="$chmodprog $2"
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68 shift
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69 shift
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70 continue;;
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71
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72 -o) chowncmd="$chownprog $2"
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73 shift
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74 shift
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75 continue;;
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76
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77 -g) chgrpcmd="$chgrpprog $2"
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78 shift
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79 shift
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80 continue;;
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81
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82 -s) stripcmd="$stripprog"
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83 shift
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84 continue;;
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85
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86 -t=*) transformarg=`echo $1 | sed 's/-t=//'`
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87 shift
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88 continue;;
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89
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90 -b=*) transformbasename=`echo $1 | sed 's/-b=//'`
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91 shift
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92 continue;;
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93
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94 *) if [ x"$src" = x ]
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95 then
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96 src=$1
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97 else
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98 # this colon is to work around a 386BSD /bin/sh bug
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99 :
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100 dst=$1
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101 fi
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102 shift
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103 continue;;
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104 esac
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105 done
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106
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107 if [ x"$src" = x ]
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108 then
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109 echo "install: no input file specified"
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110 exit 1
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111 else
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112 true
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113 fi
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114
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115 if [ x"$dir_arg" != x ]; then
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116 dst=$src
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117 src=""
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118
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119 if [ -d $dst ]; then
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120 instcmd=:
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121 chmodcmd=""
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122 else
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123 instcmd=mkdir
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124 fi
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125 else
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126
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127 # Waiting for this to be detected by the "$instcmd $src $dsttmp" command
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128 # might cause directories to be created, which would be especially bad
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129 # if $src (and thus $dsttmp) contains '*'.
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130
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131 if [ -f $src -o -d $src ]
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132 then
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133 true
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134 else
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135 echo "install: $src does not exist"
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136 exit 1
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137 fi
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138
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139 if [ x"$dst" = x ]
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140 then
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141 echo "install: no destination specified"
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142 exit 1
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143 else
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144 true
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145 fi
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146
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147 # If destination is a directory, append the input filename; if your system
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148 # does not like double slashes in filenames, you may need to add some logic
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149
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150 if [ -d $dst ]
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151 then
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152 dst="$dst"/`basename $src`
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153 else
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154 true
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155 fi
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156 fi
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157
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158 ## this sed command emulates the dirname command
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159 dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
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160
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161 # Make sure that the destination directory exists.
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162 # this part is taken from Noah Friedman's mkinstalldirs script
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163
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164 # Skip lots of stat calls in the usual case.
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165 if [ ! -d "$dstdir" ]; then
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166 defaultIFS='
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167 '
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168 IFS="${IFS-${defaultIFS}}"
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169
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170 oIFS="${IFS}"
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171 # Some sh's can't handle IFS=/ for some reason.
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172 IFS='%'
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173 set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
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174 IFS="${oIFS}"
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175
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176 pathcomp=''
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177
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178 while [ $# -ne 0 ] ; do
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179 pathcomp="${pathcomp}${1}"
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180 shift
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181
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182 if [ ! -d "${pathcomp}" ] ;
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183 then
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184 $mkdirprog "${pathcomp}"
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185 else
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186 true
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187 fi
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188
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189 pathcomp="${pathcomp}/"
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190 done
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191 fi
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192
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193 if [ x"$dir_arg" != x ]
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194 then
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195 $doit $instcmd $dst &&
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196
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197 if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else true ; fi &&
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198 if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else true ; fi &&
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199 if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else true ; fi &&
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200 if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else true ; fi
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201 else
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202
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203 # If we're going to rename the final executable, determine the name now.
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204
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205 if [ x"$transformarg" = x ]
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206 then
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207 dstfile=`basename $dst`
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208 else
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209 dstfile=`basename $dst $transformbasename |
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210 sed $transformarg`$transformbasename
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211 fi
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212
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213 # don't allow the sed command to completely eliminate the filename
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214
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215 if [ x"$dstfile" = x ]
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216 then
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217 dstfile=`basename $dst`
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218 else
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219 true
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220 fi
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221
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222 # Make a temp file name in the proper directory.
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223
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224 dsttmp=$dstdir/#inst.$$#
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225
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226 # Move or copy the file name to the temp name
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227
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228 $doit $instcmd $src $dsttmp &&
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229
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230 trap "rm -f ${dsttmp}" 0 &&
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231
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232 # and set any options; do chmod last to preserve setuid bits
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233
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234 # If any of these fail, we abort the whole thing. If we want to
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235 # ignore errors from any of these, just make sure not to ignore
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236 # errors from the above "$doit $instcmd $src $dsttmp" command.
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237
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238 if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else true;fi &&
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239 if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else true;fi &&
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240 if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else true;fi &&
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241 if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else true;fi &&
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242
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243 # Now rename the file to the real destination.
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244
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245 $doit $rmcmd -f $dstdir/$dstfile &&
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246 $doit $mvcmd $dsttmp $dstdir/$dstfile
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247
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248 fi &&
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249
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250
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251 exit 0