1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 |
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7 | <!ENTITY liba52-download-http
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8 | "https://liba52.sourceforge.net/files/a52dec-&liba52-version;.tar.gz">
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9 | <!ENTITY liba52-download-ftp " ">
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10 | <!ENTITY liba52-md5sum "caa9f5bc44232dc8aeea773fea56be80">
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11 | <!ENTITY liba52-size "236 KB">
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12 | <!ENTITY liba52-buildsize "2.5 MB">
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13 | <!ENTITY liba52-time "less than 0.1 SBU">
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14 | ]>
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15 |
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16 | <sect1 id="liba52" xreflabel="liba52-&liba52-version;">
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17 | <?dbhtml filename="liba52.html"?>
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18 |
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19 |
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20 | <title>Liba52-&liba52-version;</title>
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21 |
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22 | <indexterm zone="liba52">
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23 | <primary sortas="a-Liba52">Liba52</primary>
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24 | </indexterm>
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25 |
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26 | <sect2 role="package">
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27 | <title>Introduction to Liba52</title>
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28 |
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29 | <para>
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30 | <application>liba52</application> is a free library for decoding
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31 | ATSC A/52 (also known as AC-3) streams. The A/52 standard is used
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32 | in a variety of applications, including digital television and DVD.
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33 | </para>
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34 |
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35 | &lfs120_checked;
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36 |
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37 | <bridgehead renderas="sect3">Package Information</bridgehead>
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38 | <itemizedlist spacing="compact">
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39 | <listitem>
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40 | <para>
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41 | Download (HTTP): <ulink url="&liba52-download-http;"/>
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42 | </para>
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43 | </listitem>
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44 | <listitem>
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45 | <para>
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46 | Download (FTP): <ulink url="&liba52-download-ftp;"/>
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47 | </para>
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48 | </listitem>
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49 | <listitem>
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50 | <para>
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51 | Download MD5 sum: &liba52-md5sum;
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52 | </para>
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53 | </listitem>
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54 | <listitem>
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55 | <para>
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56 | Download size: &liba52-size;
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57 | </para>
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58 | </listitem>
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59 | <listitem>
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60 | <para>
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61 | Estimated disk space required: &liba52-buildsize;
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62 | </para>
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63 | </listitem>
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64 | <listitem>
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65 | <para>
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66 | Estimated build time: &liba52-time;
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67 | </para>
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68 | </listitem>
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69 | </itemizedlist>
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70 |
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71 | <bridgehead renderas="sect4">Optional</bridgehead>
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72 | <para role="optional">
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73 | <ulink url="https://cr.yp.to/djbfft.html">djbfft</ulink>
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74 | </para>
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75 |
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76 | <para condition="html" role="usernotes">
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77 | Editor Notes: <ulink url="&blfs-wiki;/liba52"/>
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78 | </para>
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79 |
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80 | </sect2>
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81 |
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82 | <sect2 role="installation">
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83 | <title>Installation of Liba52</title>
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84 |
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85 | <para>
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86 | Install <application>liba52</application> by running the
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87 | following commands:
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88 | </para>
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89 |
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90 | <screen><userinput>./configure --prefix=/usr \
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91 | --mandir=/usr/share/man \
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92 | --enable-shared \
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93 | --disable-static \
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94 | CFLAGS="${CFLAGS:--g -O3} -fPIC" &&
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95 | make</userinput></screen>
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96 |
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97 | <para>
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98 | To test the results, issue: <command>make check</command>.
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99 | </para>
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100 |
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101 | <para>
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102 | Now, as the <systemitem class="username">root</systemitem>
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103 | user:
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104 | </para>
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105 |
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106 | <screen role="root"><userinput>make install &&
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107 | cp liba52/a52_internal.h /usr/include/a52dec &&
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108 | install -v -m644 -D doc/liba52.txt \
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109 | /usr/share/doc/liba52-&liba52-version;/liba52.txt</userinput></screen>
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110 | </sect2>
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111 |
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112 | <sect2 role="commands">
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113 | <title>Command Explanations</title>
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114 |
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115 | <para>
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116 | <parameter>CFLAGS="${CFLAGS:--g -O3} -fPIC"</parameter>: This appends
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117 | <option>-fPIC</option> to <envar>CFLAGS</envar> but use
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118 | <option>-g -O3</option> (the default of this package) instead of an
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119 | empty string when <envar>CFLAGS</envar> is not set.
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120 | This is needed to compile <application>liba52</application> without
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121 | runtime text relocation. Runtime text relocation is prohibited on
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122 | x86_64 so <option>-fPIC</option> is strictly required. On 32-bit x86
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123 | runtime text relocation is allowed but it's insecure and it may waste
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124 | physical RAM, so <option>-fPIC</option> is still better.
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125 | </para>
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126 |
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127 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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128 | href="../../xincludes/static-libraries.xml"/>
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129 |
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130 | <para>
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131 | <command>cp liba52/a52_internal.h ...</command>: Copying this header
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132 | file into /usr/include/a52dec allows some other programs (such as
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133 | <application>xine-lib</application>) to compile and link against a system
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134 | installed <application>liba52</application>.
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135 | </para>
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136 | </sect2>
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137 |
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138 | <sect2 role="content">
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139 | <title>Contents</title>
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140 |
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141 | <segmentedlist>
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142 | <segtitle>Installed Programs</segtitle>
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143 | <segtitle>Installed Library</segtitle>
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144 | <segtitle>Installed Directories</segtitle>
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145 |
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146 | <seglistitem>
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147 | <seg>a52dec and extract_a52</seg>
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148 | <seg>liba52.so</seg>
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149 | <seg>/usr/include/a52dec and
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150 | /usr/share/doc/liba52-&liba52-version;</seg>
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151 | </seglistitem>
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152 | </segmentedlist>
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153 |
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154 | <variablelist>
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155 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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156 | <?dbfo list-presentation="list"?>
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157 | <?dbhtml list-presentation="table"?>
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158 |
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159 | <varlistentry id="a52dec">
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160 | <term><command>a52dec</command></term>
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161 | <listitem>
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162 | <para>
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163 | plays ATSC A/52 audio streams
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164 | </para>
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165 | <indexterm zone="liba52 a52dec">
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166 | <primary sortas="b-a52dec">a52dec</primary>
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167 | </indexterm>
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168 | </listitem>
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169 | </varlistentry>
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170 |
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171 | <varlistentry id="extract_a52">
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172 | <term><command>extract_a52</command></term>
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173 | <listitem>
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174 | <para>
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175 | extracts ATSC A/52 audio from an MPEG stream
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176 | </para>
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177 | <indexterm zone="liba52 extract_a52">
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178 | <primary sortas="b-extract_a52">extract_a52</primary>
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179 | </indexterm>
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180 | </listitem>
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181 | </varlistentry>
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182 |
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183 | <varlistentry id="liba52-lib">
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184 | <term><filename class="libraryfile">liba52.so</filename></term>
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185 | <listitem>
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186 | <para>
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187 | provides functions for the programs dealing with ATSC A/52 streams
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188 | </para>
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189 | <indexterm zone="liba52 liba52-lib">
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190 | <primary sortas="c-liba52">liba52.so</primary>
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191 | </indexterm>
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192 | </listitem>
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193 | </varlistentry>
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194 | </variablelist>
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195 | </sect2>
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196 |
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197 | </sect1>
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