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annotate acinclude/alsa.m4 @ 4333:55717a755897 SDL-1.2

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Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list: http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html This has the nice side effect of reducing latency on my SBLive! card.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 13 Oct 2009 09:56:15 +0000
parents b73b5af69f48
children
rev   line source
4275
b73b5af69f48 Split acinclude.m4 into its constituent parts for easy upgrading
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1 ##############################################################################
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2 dnl Configure Paths for Alsa
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3 dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
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4 dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
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5 dnl Jaroslav Kysela <perex@suse.cz>
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6 dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp
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7 dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
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8 dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
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9 dnl enables arguments --with-alsa-prefix=
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10 dnl --with-alsa-enc-prefix=
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11 dnl --disable-alsatest
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12 dnl
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13 dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
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14 dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
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15 dnl
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16 AC_DEFUN([AM_PATH_ALSA],
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17 [dnl Save the original CFLAGS, LDFLAGS, and LIBS
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18 alsa_save_CFLAGS="$CFLAGS"
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19 alsa_save_LDFLAGS="$LDFLAGS"
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20 alsa_save_LIBS="$LIBS"
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21 alsa_found=yes
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22
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23 dnl
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24 dnl Get the cflags and libraries for alsa
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25 dnl
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26 AC_ARG_WITH(alsa-prefix,
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27 [ --with-alsa-prefix=PFX Prefix where Alsa library is installed(optional)],
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28 [alsa_prefix="$withval"], [alsa_prefix=""])
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29
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30 AC_ARG_WITH(alsa-inc-prefix,
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31 [ --with-alsa-inc-prefix=PFX Prefix where include libraries are (optional)],
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32 [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
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33
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34 dnl FIXME: this is not yet implemented
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35 AC_ARG_ENABLE(alsatest,
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36 [ --disable-alsatest Do not try to compile and run a test Alsa program],
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37 [enable_alsatest="$enableval"],
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38 [enable_alsatest=yes])
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39
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40 dnl Add any special include directories
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41 AC_MSG_CHECKING(for ALSA CFLAGS)
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42 if test "$alsa_inc_prefix" != "" ; then
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43 ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
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44 CFLAGS="$CFLAGS -I$alsa_inc_prefix"
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45 fi
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46 AC_MSG_RESULT($ALSA_CFLAGS)
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47
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48 dnl add any special lib dirs
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49 AC_MSG_CHECKING(for ALSA LDFLAGS)
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50 if test "$alsa_prefix" != "" ; then
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51 ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
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52 LDFLAGS="$LDFLAGS $ALSA_LIBS"
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53 fi
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54
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55 dnl add the alsa library
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56 ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
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57 LIBS=`echo $LIBS | sed 's/-lm//'`
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58 LIBS=`echo $LIBS | sed 's/-ldl//'`
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59 LIBS=`echo $LIBS | sed 's/-lpthread//'`
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60 LIBS=`echo $LIBS | sed 's/ //'`
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61 LIBS="$ALSA_LIBS $LIBS"
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62 AC_MSG_RESULT($ALSA_LIBS)
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63
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64 dnl Check for a working version of libasound that is of the right version.
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65 min_alsa_version=ifelse([$1], ,0.1.1,$1)
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66 AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
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67 no_alsa=""
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68 alsa_min_major_version=`echo $min_alsa_version | \
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69 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
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70 alsa_min_minor_version=`echo $min_alsa_version | \
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71 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
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72 alsa_min_micro_version=`echo $min_alsa_version | \
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73 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
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74
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75 AC_LANG_SAVE
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76 AC_LANG_C
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77 AC_TRY_COMPILE([
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78 #include <alsa/asoundlib.h>
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79 ], [
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80 /* ensure backward compatibility */
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81 #if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
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82 #define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
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83 #endif
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84 #if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
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85 #define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
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86 #endif
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87 #if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
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88 #define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
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89 #endif
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90
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91 # if(SND_LIB_MAJOR > $alsa_min_major_version)
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92 exit(0);
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93 # else
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94 # if(SND_LIB_MAJOR < $alsa_min_major_version)
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95 # error not present
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96 # endif
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97
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98 # if(SND_LIB_MINOR > $alsa_min_minor_version)
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99 exit(0);
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100 # else
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101 # if(SND_LIB_MINOR < $alsa_min_minor_version)
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102 # error not present
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103 # endif
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104
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105 # if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
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106 # error not present
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107 # endif
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108 # endif
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109 # endif
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110 exit(0);
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111 ],
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112 [AC_MSG_RESULT(found.)],
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113 [AC_MSG_RESULT(not present.)
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114 ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
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115 alsa_found=no]
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116 )
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117 AC_LANG_RESTORE
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118
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119 dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
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120 if test "x$enable_alsatest" = "xyes"; then
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121 AC_CHECK_LIB([asound], [snd_ctl_open],,
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122 [ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
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123 alsa_found=no]
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124 )
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125 fi
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126
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127 if test "x$alsa_found" = "xyes" ; then
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128 ifelse([$2], , :, [$2])
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129 LIBS=`echo $LIBS | sed 's/-lasound//g'`
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130 LIBS=`echo $LIBS | sed 's/ //'`
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131 LIBS="-lasound $LIBS"
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132 fi
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133 if test "x$alsa_found" = "xno" ; then
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134 ifelse([$3], , :, [$3])
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135 CFLAGS="$alsa_save_CFLAGS"
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136 LDFLAGS="$alsa_save_LDFLAGS"
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137 LIBS="$alsa_save_LIBS"
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138 ALSA_CFLAGS=""
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139 ALSA_LIBS=""
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140 fi
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141
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142 dnl That should be it. Now just export out symbols:
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143 AC_SUBST(ALSA_CFLAGS)
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144 AC_SUBST(ALSA_LIBS)
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145 ])