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<div class="title">sounddecoder_ogg.cpp</div> </div>
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<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) 2005-2008 by the FIFE team *</span>
<a name="l00003"></a>00003 <span class="comment"> * http://www.fifengine.de *</span>
<a name="l00004"></a>00004 <span class="comment"> * This file is part of FIFE. *</span>
<a name="l00005"></a>00005 <span class="comment"> * *</span>
<a name="l00006"></a>00006 <span class="comment"> * FIFE is free software; you can redistribute it and/or *</span>
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public *</span>
<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either *</span>
<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version. *</span>
<a name="l00010"></a>00010 <span class="comment"> * *</span>
<a name="l00011"></a>00011 <span class="comment"> * This library is distributed in the hope that it will be useful, *</span>
<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of *</span>
<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *</span>
<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details. *</span>
<a name="l00015"></a>00015 <span class="comment"> * *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public *</span>
<a name="l00017"></a>00017 <span class="comment"> * License along with this library; if not, write to the *</span>
<a name="l00018"></a>00018 <span class="comment"> * Free Software Foundation, Inc., *</span>
<a name="l00019"></a>00019 <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *</span>
<a name="l00020"></a>00020 <span class="comment"> ***************************************************************************/</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">// Standard C++ library includes</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// Platform specific includes</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="comment">// 3rd party library includes</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="comment">// FIFE includes</span>
<a name="l00029"></a>00029 <span class="comment">// These includes are split up in two parts, separated by one empty line</span>
<a name="l00030"></a>00030 <span class="comment">// First block: files included from the FIFE root src directory</span>
<a name="l00031"></a>00031 <span class="comment">// Second block: files included from the same folder</span>
<a name="l00032"></a>00032 <span class="preprocessor">#include "util/log/logger.h"</span>
<a name="l00033"></a>00033 <span class="preprocessor">#include "util/base/exception.h"</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include "sounddecoder_ogg.h"</span>
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="keyword">namespace </span>FIFE {
<a name="l00038"></a>00038 <span class="keyword">static</span> Logger _log(LM_AUDIO);
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="comment">/* OggVorbis Callback functions</span>
<a name="l00041"></a>00041 <span class="comment"> */</span>
<a name="l00042"></a>00042 <span class="keyword">namespace </span>OGG_cb {
<a name="l00043"></a>00043 <span class="keyword">static</span> <span class="keywordtype">size_t</span> read(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">size_t</span> size, <span class="keywordtype">size_t</span> nmemb, <span class="keywordtype">void</span> *datasource) {
<a name="l00044"></a>00044 RawData* rdp = <span class="keyword">reinterpret_cast<</span>RawData*<span class="keyword">></span>(datasource);
<a name="l00045"></a>00045 <span class="keywordtype">size_t</span> restlen = rdp->getDataLength()-rdp->getCurrentIndex();
<a name="l00046"></a>00046 <span class="keywordtype">size_t</span> len = (restlen<=size*nmemb)?restlen:size*nmemb;
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (len) {
<a name="l00048"></a>00048 rdp->readInto(reinterpret_cast<uint8_t *>(ptr), len);
<a name="l00049"></a>00049 }
<a name="l00050"></a>00050 <span class="keywordflow">return</span> len;
<a name="l00051"></a>00051 }
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="keyword">static</span> <span class="keywordtype">int</span> seek(<span class="keywordtype">void</span> *datasource, ogg_int64_t offset, <span class="keywordtype">int</span> whence) {
<a name="l00054"></a>00054 RawData* rdp = <span class="keyword">reinterpret_cast<</span>RawData*<span class="keyword">></span>(datasource);
<a name="l00055"></a>00055 <span class="keywordflow">switch</span> (whence) {
<a name="l00056"></a>00056 <span class="keywordflow">case</span> SEEK_SET:
<a name="l00057"></a>00057 (*rdp).setIndex(offset);
<a name="l00058"></a>00058 <span class="keywordflow">return</span> 0;
<a name="l00059"></a>00059 <span class="keywordflow">case</span> SEEK_CUR:
<a name="l00060"></a>00060 (*rdp).moveIndex(offset);
<a name="l00061"></a>00061 <span class="keywordflow">return</span> 0;
<a name="l00062"></a>00062 <span class="keywordflow">case</span> SEEK_END:
<a name="l00063"></a>00063 (*rdp).setIndex( (*rdp).getDataLength() -1 + offset);
<a name="l00064"></a>00064 <span class="keywordflow">return</span> 0;
<a name="l00065"></a>00065 }
<a name="l00066"></a>00066 <span class="keywordflow">return</span> -1;
<a name="l00067"></a>00067 }
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="keyword">static</span> <span class="keywordtype">int</span> close(<span class="keywordtype">void</span> *datasource) { <span class="keywordflow">return</span> 0; }
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keyword">static</span> <span class="keywordtype">long</span> tell(<span class="keywordtype">void</span> *datasource) {
<a name="l00072"></a>00072 RawData* rdp = <span class="keyword">reinterpret_cast<</span>RawData*<span class="keyword">></span>(datasource);
<a name="l00073"></a>00073 <span class="keywordflow">return</span> (*rdp).getCurrentIndex();
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076
<a name="l00077"></a>00077 SoundDecoderOgg::SoundDecoderOgg(RawData* rdp) : m_file(rdp) {
<a name="l00078"></a>00078
<a name="l00079"></a>00079 ov_callbacks ocb = {
<a name="l00080"></a>00080 OGG_cb::read, OGG_cb::seek, OGG_cb::close, OGG_cb::tell
<a name="l00081"></a>00081 };
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <span class="keywordflow">if</span> (0 > ov_open_callbacks(m_file.get(), &m_ovf, 0, 0, ocb)) {
<a name="l00084"></a>00084 <span class="keywordflow">throw</span> InvalidFormat(<span class="stringliteral">"Error opening OggVorbis file"</span>);
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087
<a name="l00088"></a>00088 vorbis_info *vi = ov_info(&m_ovf, -1);
<a name="l00089"></a>00089 <span class="keywordflow">if</span> (!vi) {
<a name="l00090"></a>00090 <span class="keywordflow">throw</span> InvalidFormat(<span class="stringliteral">"Error fetching OggVorbis info"</span>);
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (!ov_seekable(&m_ovf)) {
<a name="l00094"></a>00094 <span class="keywordflow">throw</span> InvalidFormat(<span class="stringliteral">"OggVorbis file has to be seekable"</span>);
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a>00097 m_isstereo = vi->channels == 2;
<a name="l00098"></a>00098 m_samplerate = vi->rate;
<a name="l00099"></a>00099 m_is8bit = <span class="keyword">false</span>;
<a name="l00100"></a>00100 m_declength = (m_isstereo ? 2 : 1) * 2 * ov_pcm_total(&m_ovf, -1);
<a name="l00101"></a>00101 m_datasize = 0;
<a name="l00102"></a>00102 m_data = NULL;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="keywordtype">bool</span> SoundDecoderOgg::decode(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> length) {
<a name="l00106"></a>00106 <span class="keywordtype">int</span> stream = 0;
<a name="l00107"></a>00107 <span class="keywordtype">int</span> ret = 0;
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="comment">// release buffer and allocate new memory</span>
<a name="l00110"></a>00110 releaseBuffer();
<a name="l00111"></a>00111 m_data = <span class="keyword">new</span> <span class="keywordtype">char</span>[length];
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="comment">// decode the stream</span>
<a name="l00114"></a>00114 m_datasize = 0;
<a name="l00115"></a>00115 <span class="keywordflow">do</span> {
<a name="l00116"></a>00116 ret = ov_read(&m_ovf, m_data + m_datasize,
<a name="l00117"></a>00117 length-m_datasize, 0, 2, 1, &stream);
<a name="l00118"></a>00118 <span class="keywordflow">if</span> (ret > 0) {
<a name="l00119"></a>00119 m_datasize += ret;
<a name="l00120"></a>00120 }
<a name="l00121"></a>00121
<a name="l00122"></a>00122 } <span class="keywordflow">while</span> (length-m_datasize > 0 && ret > 0);
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="keywordflow">return</span> m_datasize == 0;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keywordtype">bool</span> SoundDecoderOgg::setCursor(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> pos) {
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="keywordflow">if</span> (ov_pcm_seek(&m_ovf, pos / ((m_isstereo ? 2 : 1) * 2)) == 0) {
<a name="l00130"></a>00130 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 }
</pre></div></div>
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