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<h1>streaminfo.c</h1><a href="streaminfo_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (c) 2005, The Musepack Development Team</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> modification, are permitted provided that the following conditions are</span>
<a name="l00007"></a>00007 <span class="comment"> met:</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment"> * Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> notice, this list of conditions and the following disclaimer.</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment"> * Redistributions in binary form must reproduce the above</span>
<a name="l00013"></a>00013 <span class="comment"> copyright notice, this list of conditions and the following</span>
<a name="l00014"></a>00014 <span class="comment"> disclaimer in the documentation and/or other materials provided</span>
<a name="l00015"></a>00015 <span class="comment"> with the distribution.</span>
<a name="l00016"></a>00016 <span class="comment"></span>
<a name="l00017"></a>00017 <span class="comment"> * Neither the name of the The Musepack Development Team nor the</span>
<a name="l00018"></a>00018 <span class="comment"> names of its contributors may be used to endorse or promote</span>
<a name="l00019"></a>00019 <span class="comment"> products derived from this software without specific prior</span>
<a name="l00020"></a>00020 <span class="comment"> written permission.</span>
<a name="l00021"></a>00021 <span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00023"></a>00023 <span class="comment"> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment"> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00025"></a>00025 <span class="comment"> A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00026"></a>00026 <span class="comment"> OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00027"></a>00027 <span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00028"></a>00028 <span class="comment"> LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00029"></a>00029 <span class="comment"> DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00030"></a>00030 <span class="comment"> THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00031"></a>00031 <span class="comment"> (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00032"></a>00032 <span class="comment"> OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00033"></a>00033 <span class="comment">*/</span>
<a name="l00034"></a>00034
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="preprocessor">#include <<a class="code" href="mpcdec_8h.html">mpcdec/mpcdec.h</a>></span>
<a name="l00039"></a>00039 <span class="preprocessor">#include <<a class="code" href="internal_8h.html">mpcdec/internal.h</a>></span>
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *
<a name="l00042"></a>00042 Stringify(mpc_uint32_t profile) <span class="comment">// profile is 0...15, where 7...13 is used</span>
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> na[] = <span class="stringliteral">"n.a."</span>;
<a name="l00045"></a>00045 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *Names[] = {
<a name="l00046"></a>00046 na, <span class="stringliteral">"'Unstable/Experimental'"</span>, na, na,
<a name="l00047"></a>00047 na, <span class="stringliteral">"'quality 0'"</span>, <span class="stringliteral">"'quality 1'"</span>, <span class="stringliteral">"'Telephone'"</span>,
<a name="l00048"></a>00048 <span class="stringliteral">"'Thumb'"</span>, <span class="stringliteral">"'Radio'"</span>, <span class="stringliteral">"'Standard'"</span>, <span class="stringliteral">"'Xtreme'"</span>,
<a name="l00049"></a>00049 <span class="stringliteral">"'Insane'"</span>, <span class="stringliteral">"'BrainDead'"</span>, <span class="stringliteral">"'quality 9'"</span>, <span class="stringliteral">"'quality 10'"</span>
<a name="l00050"></a>00050 };
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keywordflow">return</span> profile >= <span class="keyword">sizeof</span>(Names) / <span class="keyword">sizeof</span>(*Names) ? na : Names[profile];
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordtype">void</span>
<a name="l00056"></a><a class="code" href="streaminfo_8c.html#a1">00056</a> <a class="code" href="mpcdec_8h.html#a9">mpc_streaminfo_init</a>(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si)
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058 memset(si, 0, <span class="keyword">sizeof</span>(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a>));
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">// read information from SV8 header</span>
<a name="l00062"></a>00062 <span class="comment">// not yet implemented</span>
<a name="l00063"></a>00063 <span class="keyword">static</span> mpc_int32_t
<a name="l00064"></a>00064 streaminfo_read_header_sv8(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si, <a class="code" href="structmpc__reader__t.html">mpc_reader</a> * fp)
<a name="l00065"></a>00065 {
<a name="l00066"></a>00066 (void) si;
<a name="l00067"></a>00067 (void) fp;
<a name="l00068"></a>00068 <span class="keywordflow">return</span> 0;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070
<a name="l00072"></a>00072 <span class="keyword">static</span> mpc_int32_t
<a name="l00073"></a>00073 streaminfo_read_header_sv7(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si, mpc_uint32_t HeaderData[8])
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075 <span class="keyword">const</span> mpc_int32_t samplefreqs[4] = { 44100, 48000, 37800, 32000 };
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="comment">//mpc_uint32_t HeaderData [8];</span>
<a name="l00078"></a>00078 mpc_uint16_t Estimatedpeak_title = 0;
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> > 0x71) {
<a name="l00081"></a>00081 <span class="comment">// Update (si->stream_version);</span>
<a name="l00082"></a>00082 <span class="keywordflow">return</span> 0;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="comment">/*</span>
<a name="l00086"></a>00086 <span class="comment"> if ( !fp->seek ( si->header_position ) ) // seek to header start</span>
<a name="l00087"></a>00087 <span class="comment"> return ERROR_CODE_FILE;</span>
<a name="l00088"></a>00088 <span class="comment"> if ( fp->read ( HeaderData, sizeof HeaderData) != sizeof HeaderData )</span>
<a name="l00089"></a>00089 <span class="comment"> return ERROR_CODE_FILE;</span>
<a name="l00090"></a>00090 <span class="comment"> */</span>
<a name="l00091"></a>00091
<a name="l00092"></a>00092 si-><a class="code" href="structmpc__streaminfo.html#z1_4">bitrate</a> = 0;
<a name="l00093"></a>00093 si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> = HeaderData[1];
<a name="l00094"></a>00094 si-><a class="code" href="structmpc__streaminfo.html#z1_9">is</a> = 0;
<a name="l00095"></a>00095 si-><a class="code" href="structmpc__streaminfo.html#z1_10">ms</a> = (HeaderData[2] >> 30) & 0x0001;
<a name="l00096"></a>00096 si-><a class="code" href="structmpc__streaminfo.html#z1_8">max_band</a> = (HeaderData[2] >> 24) & 0x003F;
<a name="l00097"></a>00097 si-><a class="code" href="structmpc__streaminfo.html#z1_11">block_size</a> = 1;
<a name="l00098"></a>00098 si-><a class="code" href="structmpc__streaminfo.html#z1_12">profile</a> = (HeaderData[2] << 8) >> 28;
<a name="l00099"></a>00099 si-><a class="code" href="structmpc__streaminfo.html#z1_13">profile_name</a> = Stringify(si-><a class="code" href="structmpc__streaminfo.html#z1_12">profile</a>);
<a name="l00100"></a>00100 si-><a class="code" href="structmpc__streaminfo.html#z1_0">sample_freq</a> = samplefreqs[(HeaderData[2] >> 16) & 0x0003];
<a name="l00101"></a>00101 Estimatedpeak_title = (mpc_uint16_t) (HeaderData[2] & 0xFFFF); <span class="comment">// read the ReplayGain data</span>
<a name="l00102"></a>00102 si-><a class="code" href="structmpc__streaminfo.html#z2_0">gain_title</a> = (mpc_uint16_t) ((HeaderData[3] >> 16) & 0xFFFF);
<a name="l00103"></a>00103 si-><a class="code" href="structmpc__streaminfo.html#z2_3">peak_title</a> = (mpc_uint16_t) (HeaderData[3] & 0xFFFF);
<a name="l00104"></a>00104 si-><a class="code" href="structmpc__streaminfo.html#z2_1">gain_album</a> = (mpc_uint16_t) ((HeaderData[4] >> 16) & 0xFFFF);
<a name="l00105"></a>00105 si-><a class="code" href="structmpc__streaminfo.html#z2_2">peak_album</a> = (mpc_uint16_t) (HeaderData[4] & 0xFFFF);
<a name="l00106"></a>00106 si-><a class="code" href="structmpc__streaminfo.html#z3_0">is_true_gapless</a> = (HeaderData[5] >> 31) & 0x0001; <span class="comment">// true gapless: used?</span>
<a name="l00107"></a>00107 si-><a class="code" href="structmpc__streaminfo.html#z3_1">last_frame_samples</a> = (HeaderData[5] >> 20) & 0x07FF; <span class="comment">// true gapless: valid samples for last frame</span>
<a name="l00108"></a>00108 si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> = (HeaderData[6] >> 24) & 0x00FF;
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> == 0) {
<a name="l00111"></a>00111 sprintf(si-><a class="code" href="structmpc__streaminfo.html#z3_3">encoder</a>, <span class="stringliteral">"Buschmann 1.7.0...9, Klemm 0.90...1.05"</span>);
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 <span class="keywordflow">else</span> {
<a name="l00114"></a>00114 <span class="keywordflow">switch</span> (si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> % 10) {
<a name="l00115"></a>00115 <span class="keywordflow">case</span> 0:
<a name="l00116"></a>00116 sprintf(si-><a class="code" href="structmpc__streaminfo.html#z3_3">encoder</a>, <span class="stringliteral">"Release %u.%u"</span>, si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> / 100,
<a name="l00117"></a>00117 si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> / 10 % 10);
<a name="l00118"></a>00118 <span class="keywordflow">break</span>;
<a name="l00119"></a>00119 <span class="keywordflow">case</span> 2:
<a name="l00120"></a>00120 <span class="keywordflow">case</span> 4:
<a name="l00121"></a>00121 <span class="keywordflow">case</span> 6:
<a name="l00122"></a>00122 <span class="keywordflow">case</span> 8:
<a name="l00123"></a>00123 sprintf(si-><a class="code" href="structmpc__streaminfo.html#z3_3">encoder</a>, <span class="stringliteral">"Beta %u.%02u"</span>, si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> / 100,
<a name="l00124"></a>00124 si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> % 100);
<a name="l00125"></a>00125 <span class="keywordflow">break</span>;
<a name="l00126"></a>00126 <span class="keywordflow">default</span>:
<a name="l00127"></a>00127 sprintf(si-><a class="code" href="structmpc__streaminfo.html#z3_3">encoder</a>, <span class="stringliteral">"--Alpha-- %u.%02u"</span>,
<a name="l00128"></a>00128 si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> / 100, si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> % 100);
<a name="l00129"></a>00129 <span class="keywordflow">break</span>;
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="comment">// if ( si->peak_title == 0 ) // there is no correct peak_title contained within header</span>
<a name="l00134"></a>00134 <span class="comment">// si->peak_title = (mpc_uint16_t)(Estimatedpeak_title * 1.18);</span>
<a name="l00135"></a>00135 <span class="comment">// if ( si->peak_album == 0 )</span>
<a name="l00136"></a>00136 <span class="comment">// si->peak_album = si->peak_title; // no correct peak_album, use peak_title</span>
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="comment">//si->sample_freq = 44100; // AB: used by all files up to SV7</span>
<a name="l00139"></a>00139 si-><a class="code" href="structmpc__streaminfo.html#z1_1">channels</a> = 2;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a0">ERROR_CODE_OK</a>;
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="comment">// read information from SV4-SV6 header</span>
<a name="l00145"></a>00145 <span class="keyword">static</span> mpc_int32_t
<a name="l00146"></a>00146 streaminfo_read_header_sv6(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si, mpc_uint32_t HeaderData[8])
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 <span class="comment">//mpc_uint32_t HeaderData [8];</span>
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="comment">/*</span>
<a name="l00151"></a>00151 <span class="comment"> if ( !fp->seek ( si->header_position ) ) // seek to header start</span>
<a name="l00152"></a>00152 <span class="comment"> return ERROR_CODE_FILE;</span>
<a name="l00153"></a>00153 <span class="comment"> if ( fp->read ( HeaderData, sizeof HeaderData ) != sizeof HeaderData )</span>
<a name="l00154"></a>00154 <span class="comment"> return ERROR_CODE_FILE;</span>
<a name="l00155"></a>00155 <span class="comment"> */</span>
<a name="l00156"></a>00156
<a name="l00157"></a>00157 si-><a class="code" href="structmpc__streaminfo.html#z1_4">bitrate</a> = (HeaderData[0] >> 23) & 0x01FF; <span class="comment">// read the file-header (SV6 and below)</span>
<a name="l00158"></a>00158 si-><a class="code" href="structmpc__streaminfo.html#z1_9">is</a> = (HeaderData[0] >> 22) & 0x0001;
<a name="l00159"></a>00159 si-><a class="code" href="structmpc__streaminfo.html#z1_10">ms</a> = (HeaderData[0] >> 21) & 0x0001;
<a name="l00160"></a>00160 si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> = (HeaderData[0] >> 11) & 0x03FF;
<a name="l00161"></a>00161 si-><a class="code" href="structmpc__streaminfo.html#z1_8">max_band</a> = (HeaderData[0] >> 6) & 0x001F;
<a name="l00162"></a>00162 si-><a class="code" href="structmpc__streaminfo.html#z1_11">block_size</a> = (HeaderData[0]) & 0x003F;
<a name="l00163"></a>00163 si-><a class="code" href="structmpc__streaminfo.html#z1_12">profile</a> = 0;
<a name="l00164"></a>00164 si-><a class="code" href="structmpc__streaminfo.html#z1_13">profile_name</a> = Stringify((mpc_uint32_t) (-1));
<a name="l00165"></a>00165 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> >= 5)
<a name="l00166"></a>00166 si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> = HeaderData[1]; <span class="comment">// 32 bit</span>
<a name="l00167"></a>00167 <span class="keywordflow">else</span>
<a name="l00168"></a>00168 si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> = (HeaderData[1] >> 16); <span class="comment">// 16 bit</span>
<a name="l00169"></a>00169
<a name="l00170"></a>00170 si-><a class="code" href="structmpc__streaminfo.html#z2_0">gain_title</a> = 0; <span class="comment">// not supported</span>
<a name="l00171"></a>00171 si-><a class="code" href="structmpc__streaminfo.html#z2_3">peak_title</a> = 0;
<a name="l00172"></a>00172 si-><a class="code" href="structmpc__streaminfo.html#z2_1">gain_album</a> = 0;
<a name="l00173"></a>00173 si-><a class="code" href="structmpc__streaminfo.html#z2_2">peak_album</a> = 0;
<a name="l00174"></a>00174
<a name="l00175"></a>00175 si-><a class="code" href="structmpc__streaminfo.html#z3_1">last_frame_samples</a> = 0;
<a name="l00176"></a>00176 si-><a class="code" href="structmpc__streaminfo.html#z3_0">is_true_gapless</a> = 0;
<a name="l00177"></a>00177
<a name="l00178"></a>00178 si-><a class="code" href="structmpc__streaminfo.html#z3_2">encoder_version</a> = 0;
<a name="l00179"></a>00179 si-><a class="code" href="structmpc__streaminfo.html#z3_3">encoder</a>[0] = <span class="charliteral">'\0'</span>;
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> == 7)
<a name="l00182"></a>00182 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a2">ERROR_CODE_SV7BETA</a>; <span class="comment">// are there any unsupported parameters used?</span>
<a name="l00183"></a>00183 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_4">bitrate</a> != 0)
<a name="l00184"></a>00184 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a3">ERROR_CODE_CBR</a>;
<a name="l00185"></a>00185 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_9">is</a> != 0)
<a name="l00186"></a>00186 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a4">ERROR_CODE_IS</a>;
<a name="l00187"></a>00187 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_11">block_size</a> != 1)
<a name="l00188"></a>00188 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a5">ERROR_CODE_BLOCKSIZE</a>;
<a name="l00189"></a>00189
<a name="l00190"></a>00190 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> < 6) <span class="comment">// Bugfix: last frame was invalid for up to SV5</span>
<a name="l00191"></a>00191 si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> -= 1;
<a name="l00192"></a>00192
<a name="l00193"></a>00193 si-><a class="code" href="structmpc__streaminfo.html#z1_0">sample_freq</a> = 44100; <span class="comment">// AB: used by all files up to SV7</span>
<a name="l00194"></a>00194 si-><a class="code" href="structmpc__streaminfo.html#z1_1">channels</a> = 2;
<a name="l00195"></a>00195
<a name="l00196"></a>00196 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> < 4 || si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> > 7)
<a name="l00197"></a>00197 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a6">ERROR_CODE_INVALIDSV</a>;
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a0">ERROR_CODE_OK</a>;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="comment">// reads file header and tags</span>
<a name="l00203"></a>00203 mpc_int32_t
<a name="l00204"></a><a class="code" href="streaminfo_8c.html#a5">00204</a> <a class="code" href="mpcdec_8h.html#a10">mpc_streaminfo_read</a>(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si, <a class="code" href="structmpc__reader__t.html">mpc_reader</a> * r)
<a name="l00205"></a>00205 {
<a name="l00206"></a>00206 mpc_uint32_t HeaderData[8];
<a name="l00207"></a>00207 mpc_int32_t Error = 0;
<a name="l00208"></a>00208
<a name="l00209"></a>00209 <span class="comment">// get header position</span>
<a name="l00210"></a>00210 <span class="keywordflow">if</span> ((si-><a class="code" href="structmpc__streaminfo.html#z1_2">header_position</a> = <a class="code" href="internal_8h.html#a2">JumpID3v2</a>(r)) < 0) {
<a name="l00211"></a>00211 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a1">ERROR_CODE_FILE</a>;
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 <span class="comment">// seek to first byte of mpc data</span>
<a name="l00214"></a>00214 <span class="keywordflow">if</span> (!r-><a class="code" href="structmpc__reader__t.html#o1">seek</a>(r-><a class="code" href="structmpc__reader__t.html#o5">data</a>, si-><a class="code" href="structmpc__streaminfo.html#z1_2">header_position</a>)) {
<a name="l00215"></a>00215 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a1">ERROR_CODE_FILE</a>;
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217 <span class="keywordflow">if</span> (r-><a class="code" href="structmpc__reader__t.html#o0">read</a>(r-><a class="code" href="structmpc__reader__t.html#o5">data</a>, HeaderData, 8 * 4) != 8 * 4) {
<a name="l00218"></a>00218 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a1">ERROR_CODE_FILE</a>;
<a name="l00219"></a>00219 }
<a name="l00220"></a>00220 <span class="keywordflow">if</span> (!r-><a class="code" href="structmpc__reader__t.html#o1">seek</a>(r-><a class="code" href="structmpc__reader__t.html#o5">data</a>, si-><a class="code" href="structmpc__streaminfo.html#z1_2">header_position</a> + 6 * 4)) {
<a name="l00221"></a>00221 <span class="keywordflow">return</span> <a class="code" href="mpcdec_8h.html#a1">ERROR_CODE_FILE</a>;
<a name="l00222"></a>00222 }
<a name="l00223"></a>00223
<a name="l00224"></a>00224 si-><a class="code" href="structmpc__streaminfo.html#z3_5">total_file_length</a> = r-><a class="code" href="structmpc__reader__t.html#o3">get_size</a>(r-><a class="code" href="structmpc__reader__t.html#o5">data</a>);
<a name="l00225"></a>00225 si-><a class="code" href="structmpc__streaminfo.html#z3_4">tag_offset</a> = si-><a class="code" href="structmpc__streaminfo.html#z3_5">total_file_length</a>;
<a name="l00226"></a>00226 <span class="keywordflow">if</span> (memcmp(HeaderData, <span class="stringliteral">"MP+"</span>, 3) == 0) {
<a name="l00227"></a>00227 <span class="preprocessor">#ifndef MPC_LITTLE_ENDIAN</span>
<a name="l00228"></a>00228 <span class="preprocessor"></span> mpc_uint32_t ptr;
<a name="l00229"></a>00229 <span class="keywordflow">for</span> (ptr = 0; ptr < 8; ptr++) {
<a name="l00230"></a>00230 HeaderData[ptr] = mpc_swap32(HeaderData[ptr]);
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 <span class="preprocessor">#endif</span>
<a name="l00233"></a>00233 <span class="preprocessor"></span> si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> = HeaderData[0] >> 24;
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="comment">// stream version 8</span>
<a name="l00236"></a>00236 <span class="keywordflow">if</span> ((si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> & 15) >= 8) {
<a name="l00237"></a>00237 Error = streaminfo_read_header_sv8(si, r);
<a name="l00238"></a>00238 }
<a name="l00239"></a>00239 <span class="comment">// stream version 7</span>
<a name="l00240"></a>00240 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((si-><a class="code" href="structmpc__streaminfo.html#z1_3">stream_version</a> & 15) == 7) {
<a name="l00241"></a>00241 Error = streaminfo_read_header_sv7(si, HeaderData);
<a name="l00242"></a>00242 }
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 <span class="keywordflow">else</span> {
<a name="l00245"></a>00245 <span class="comment">// stream version 4-6</span>
<a name="l00246"></a>00246 Error = streaminfo_read_header_sv6(si, HeaderData);
<a name="l00247"></a>00247 }
<a name="l00248"></a>00248
<a name="l00249"></a>00249 <span class="comment">// estimation, exact value needs too much time</span>
<a name="l00250"></a>00250 si-><a class="code" href="structmpc__streaminfo.html#z1_7">pcm_samples</a> = 1152 * si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> - 576;
<a name="l00251"></a>00251
<a name="l00252"></a>00252 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z1_7">pcm_samples</a> > 0) {
<a name="l00253"></a>00253 si-><a class="code" href="structmpc__streaminfo.html#z1_5">average_bitrate</a> =
<a name="l00254"></a>00254 (si-><a class="code" href="structmpc__streaminfo.html#z3_4">tag_offset</a> -
<a name="l00255"></a>00255 si-><a class="code" href="structmpc__streaminfo.html#z1_2">header_position</a>) * 8.0 * si-><a class="code" href="structmpc__streaminfo.html#z1_0">sample_freq</a> / si-><a class="code" href="structmpc__streaminfo.html#z1_7">pcm_samples</a>;
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257 <span class="keywordflow">else</span> {
<a name="l00258"></a>00258 si-><a class="code" href="structmpc__streaminfo.html#z1_5">average_bitrate</a> = 0;
<a name="l00259"></a>00259 }
<a name="l00260"></a>00260
<a name="l00261"></a>00261 <span class="keywordflow">return</span> Error;
<a name="l00262"></a>00262 }
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="keywordtype">double</span>
<a name="l00265"></a><a class="code" href="streaminfo_8c.html#a6">00265</a> <a class="code" href="mpcdec_8h.html#a11">mpc_streaminfo_get_length</a>(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si)
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267 <span class="keywordflow">return</span> (<span class="keywordtype">double</span>)<a class="code" href="mpcdec_8h.html#a12">mpc_streaminfo_get_length_samples</a>(si) /
<a name="l00268"></a>00268 (double)si->sample_freq;
<a name="l00269"></a>00269 }
<a name="l00270"></a>00270
<a name="l00271"></a>00271 mpc_int64_t
<a name="l00272"></a><a class="code" href="streaminfo_8c.html#a7">00272</a> <a class="code" href="mpcdec_8h.html#a12">mpc_streaminfo_get_length_samples</a>(<a class="code" href="structmpc__streaminfo.html">mpc_streaminfo</a> * si)
<a name="l00273"></a>00273 {
<a name="l00274"></a>00274 mpc_int64_t samples = (mpc_int64_t) si-><a class="code" href="structmpc__streaminfo.html#z1_6">frames</a> * MPC_FRAME_LENGTH;
<a name="l00275"></a>00275 <span class="keywordflow">if</span> (si-><a class="code" href="structmpc__streaminfo.html#z3_0">is_true_gapless</a>) {
<a name="l00276"></a>00276 samples -= (MPC_FRAME_LENGTH - si-><a class="code" href="structmpc__streaminfo.html#z3_1">last_frame_samples</a>);
<a name="l00277"></a>00277 }
<a name="l00278"></a>00278 <span class="keywordflow">else</span> {
<a name="l00279"></a>00279 samples -= MPC_DECODER_SYNTH_DELAY;
<a name="l00280"></a>00280 }
<a name="l00281"></a>00281 <span class="keywordflow">return</span> samples;
<a name="l00282"></a>00282 }
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