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markt
693 lines
21 KiB
HTML
693 lines
21 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=iso-8859-1">
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<meta name="Author" content="Tord Jansson">
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<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
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<title>BladeEnc DLL Manual</title>
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</head>
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<body>
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<p align="center"> </p>
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<p align="center"><font size="7">Lame-enc DLL</font> <br>
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<font size="5">version 1.16</font> <br>
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(Lame engine version 3.87) <br>
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<font size="6">Programmers Manual</font></p>
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<p align="center"><i>The lame_enc.dll and this manual is
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copyright by Albert L Faber<br>
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Originally the the DLL interface is modeled after the BladeEnc
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DLL interface<br>
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which is copyrighted by Tord Jansson and Jukka Poikolainen<br>
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This document and the DLL interface may be distributed freely</i>
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<br>
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<i>as long as no modifications are made to neither one of them.</i>
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</p>
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<p align="center"> </p>
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<p align="center"><b>Homepage</b>: <a
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href="http://www.cdex.n3.net">http://www.cdex.n3.net</a><br>
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<b>E-mail:</b> mailto: <a href="mailto:cdex@softwarecenter.net">cdex@softwarecenter.net</a>
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</p>
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<p><br>
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<br>
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<br>
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<br>
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</p>
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<p><font size="5">Distribution</font> </p>
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<p>People and companies who wants to distribute
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lame_enc.dll with their commercial products are free to do so as
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far as I'm concerned, but should be aware that lame_enc.dll might
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infringe certain MP3 related software patents held by Fraunhofer
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IIS in certain countries. </p>
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<p><br>
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</p>
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<p><font size="5">Disclaimer</font> </p>
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<p>lame_enc.dll and this manual is distributed 'as is' with no
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warranty of any kind. The Author is not to be held responsible
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for the result of any use or misuse of this product. <br>
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<br>
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</p>
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<p><font size="5">Current Bugs and Limitations</font> </p>
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<p>Although the interface is designed to be able to handle
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multiple parallel streams it can't be done yet due to limitations
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in the engine, only one stream is allowed. <br>
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</p>
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<p><font size="5">Future Compatibility</font> </p>
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<p>This interface should be compatible with all future versions
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of lame_enc.DLL without any need to recompile your programs. You
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should therefore <b>not</b> check the version number upon start
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and prevent users from running your program with a later version
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of lame_enc.DLL. <br>
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</p>
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<hr>
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<p><font size="5">How to use the DLL</font> </p>
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<p>1. Fill in a <a href="#The BE_CONFIG Structure">BE_CONFIG </a>structure
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and send it to <a href="#beInitStream()">beInitStream()</a>. Make
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sure that BE_ERR_SUCCESSFUL is returned. </p>
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<p>2. Reserve at least the amount of memory returned in
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dwBufferSize as your output buffer. </p>
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<p>3. Call <a href="#beEncodeChunk()">beEncodeChunk()</a> until
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you've encoded everything you want. </p>
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<p>4. Call <a href="#beDeinitStream()">beDeinitStream()</a> to
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make sure that all encoded data is flushed out before closing the
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stream. </p>
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<p>5. Close the stream using <a href="#beCloseStream()">beCloseStream()
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</a></p>
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<p>6. Finally, call the <a href="#beWriteVBRHeader()">beWriteVBRHeader()</a>
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functions, to insert the INFO tag MP3 Header. This is an extension
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of the Xing VBR tag which is also used for CBR encodings.
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This call can only
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be omitted if the INFO tag was explicilty disabled in the
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BE_CONFIG Structure.</p>
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<p>A handy feature is the available <a
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href="#Lame_enc.dll debug option">Lame_enc.dll debug option</a>,
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which will dump the important lame internal settings to a text
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file.<br>
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</p>
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<p><font size="5"></font> </p>
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<p><font size="5">Return Values</font> </p>
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<p>See the header-file for a complete list of function return
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values. All functions should return BE_ERR_SUCCESSFUL unless
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something went wrong. <br>
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</p>
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<hr>
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<h1><a name="Type definitions"><font size="5">Type definitions</font></a></h1>
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<p>The DLL is by default compiled with the MS Visual C/C++
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compiler, which has the following type definitions:</p>
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<table border="0">
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<tr>
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<td>Type </td>
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<td>Description</td>
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</tr>
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<tr>
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<td>CHAR</td>
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<td>signed char (8 bits)</td>
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</tr>
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<tr>
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<td>BYTE</td>
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<td>unsigned char (8 bits)</td>
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</tr>
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<tr>
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<td>SHORT</td>
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<td>signed short (16 bits)</td>
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</tr>
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<tr>
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<td>WORD</td>
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<td>unsigned short (16 bits)</td>
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</tr>
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<tr>
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<td>INT</td>
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<td>signed long (32 bits)</td>
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</tr>
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<tr>
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<td>LONG</td>
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<td>signed long (32 bits)</td>
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</tr>
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<tr>
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<td>BOOL</td>
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<td>signed long (32 bits) (YES, 32 bits for a one bit
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value)<br>
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TRUE = 0<br>
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FALSE=-1</td>
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</tr>
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<tr>
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<td>DWORD</td>
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<td>unsigned long (32 bits)</td>
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</tr>
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<tr>
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<td>FLOAT</td>
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<td>floating point (32 bits)</td>
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</tr>
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<tr>
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<td>DOUBLE</td>
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<td>float point (64 bits)</td>
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</tr>
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<tr>
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<td>LPCSTR</td>
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<td>const char* (32 bits pointer to zero terminated
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character string)</td>
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</tr>
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</table>
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<p>Within the lame_enc.dll All the structure elements are one
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byte alligned (due to backwards compatibility wiht BladEnc.DLL!</p>
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<p> </p>
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<hr>
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<h1><a name="The BE_CONFIG Structure"><font size="5">The
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BE_CONFIG Structure </font></a></h1>
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<p><font size="3">Currently there the BE_CONFIG structure has to
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varians, the old MP3 config structure that is truly compatible
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with the old BladeEnc interface, and the new defined LHV1
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structure, which can set far more options in the lame encoder</font></p>
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<p><font size="4"></font> </p>
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<h2><font size="5">The MP3 BE_CONFIG - structure (OBSOLETE)</font></h2>
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<p>This is the old structure as it was originally defined by the
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BladeEnc.DLL interface. However, I do highly recommend to use the
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new Lame specific config structure, since it gives you more
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control over the Lame encoder settings.</p>
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<p>These are the members of the BE_CONFIG structure you need to
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fill in before you call beInitStream(): <br>
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</p>
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<table border="0">
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<tr>
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<td><b>dwConfig</b></td>
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<td>Specifies what kind of output you want. Since only
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MP3 currently is supported you must set this to <b>BE_CONFIG_MP3</b></td>
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</tr>
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<tr>
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<td><b>format.mp3.dwSampleRate</b> </td>
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<td>Samplerate in Hz for MP3 file. This can be set to
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either <b>32000</b>, <b>44100</b> or <b>48000</b>.</td>
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</tr>
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<tr>
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<td><b>format.mp3.byMode</b></td>
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<td>Stereomode for MP3 file. This can be either <b>BE_MP3_MODE_STEREO</b>,
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<b>BE_MP3_MODE_DUALCHANNEL</b> or <b>BE_MP3_MODE_MONO.</b></td>
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</tr>
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<tr>
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<td><b>format.mp3.bitrate</b></td>
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<td>Bitrate (i.e. size) of MP3 file in kBit/s. Allowed
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bitrates are: <b>32, 40, 48, 56, 64, 80, 96, 112, 128,
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160, 192, 224, 256</b> and <b>320</b>.</td>
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</tr>
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<tr>
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<td><b>format.mp3.bCopyright</b></td>
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<td>If this is set to TRUE the Copyright bit in the MP3
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stream will be set.</td>
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</tr>
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<tr>
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<td><b>format.mp3.bCRC</b></td>
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<td>Set this to TRUE in order to enable CRC-checksum in
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the bitstream.</td>
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</tr>
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<tr>
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<td><b>format.mp3.bOriginal</b></td>
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<td>If this is set to TRUE the Original bit in the MP3
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stream will be set.</td>
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</tr>
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<tr>
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<td><b>format.mp3.bPrivate</b></td>
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<td>If this is set to TRUE the Private bit in the MP3
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stream will be set.</td>
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</tr>
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</table>
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<p> </p>
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<h2><font size="5">The LHV1 BE_CONFIG - structure (recommended)</font></h2>
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<p>These are the members of the LHV1 BE_CONFIG structure, you
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need to fill in before you call beInitStream(): <br>
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</p>
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<table border="0">
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<tr>
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<td><b>dwConfig</b></td>
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<td>Specifies what kind of output you want. Since only
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MP3 currently is supported you must set this to <b>BE_CONFIG_LAME</b></td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><b>format.LHV1.dwStructVersion</b></td>
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<td>Indicates the version number of the structure,
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current version number is 1</td>
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</tr>
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<tr>
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<td><b>format.LHV1.dwStructSize</b></td>
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<td>Specifies the size of the BE_CONFIG structure
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(currently 331 bytes)</td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><b>format.LHV1.dwSampleRate</b> </td>
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<td>Samplerate in Hz for MP3 file. This can be set to
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either:<br>
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<b>32000</b>, <b>44100</b> or <b>48000</b> for MPEG-I<br>
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<b>16000</b>, <b>22050</b> or <b>24000</b> for MPEG-I<br>
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<b>8000</b>, <b>11025</b> or <b>12000</b> for MPEG-II.5</td>
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</tr>
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<tr>
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<td><b>format.LHV1.dwReSampleRate</b></td>
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<td>Specifies to which sample rate the input stream has
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to be resampled, if set to 0, the encoder will decide
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which ReSample rate to use</td>
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</tr>
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<tr>
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<td><b>format.LHV1.nMode</b></td>
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<td>Stereomode for MP3 file. This can be either <b>BE_MP3_MODE_STEREO</b>,
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<b>BE_MP3_MODE_JSTEREO, BE_MP3_MODE_DUALCHANNEL</b> or <b>BE_MP3_MODE_MONO.</b></td>
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</tr>
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<tr>
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<td><strong>format.LHV1.dwBitrate</strong></td>
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<td>For CBR, this specifies the actual bitrate, for VBR,
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it specifies the minimum bitrate<br>
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Allowed bitrates are: <b>32, 40, 48, 56, 64, 80, 96, 112,
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128, 160, 192, 224, 256</b> and <b>320</b>.for MPEG-I<br>
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Allowed bitrates are: <b>8, 16, 24, 32, 40, 48, 56, 64,
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80, 96, 112, 128, 144 </b>and<b> 160</b>.for MPEG-II</td>
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</tr>
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<tr>
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<td><strong>format.LHV1.dwMaxBitrate</strong></td>
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<td>For CBR this setting is ignored, when using VBR, it
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specifies the maximum bitrate</td>
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</tr>
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<tr>
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<td><strong>format.LHV1.nPreset</strong></td>
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<td>The quality option can be set to one of the following
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presets:<br>
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NOPRESET,PHONE,SW,AM,FM,VOICE,RADIO,TAPE,HIFI,CD,STUDIO
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as defined in the LAME_QUALTIY_PRESET. Keep in mind that
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the presets can overwrite some of the other settings,
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since it is called right before the encoder is
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initialized</td>
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</tr>
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<tr>
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<td> </td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><b>format.LHV1.bCopyright</b></td>
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<td>If this is set to TRUE the Copyright bit in the MP3
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stream will be set.</td>
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</tr>
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<tr>
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<td><b>format.LHV1.bCRC</b></td>
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<td>Set this to TRUE in order to enable CRC-checksum in
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the bitstream.</td>
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</tr>
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<tr>
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<td><b>format.LHV1.bOriginal</b></td>
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<td>If this is set to TRUE the Original bit in the MP3
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stream will be set.</td>
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</tr>
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<tr>
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<td><b>format.LHV1.bPrivate</b></td>
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<td>If this is set to TRUE the Private bit in the MP3
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stream will be set.</td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><strong>format.LHV1.bWriteVBRHeader</strong></td>
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<td>Sepecifes if the a XING VBR header should be written
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or not. When this option is enabled, you have to call the
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<font size="3">beWriteVBRHeader function when encoding
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has been completed</font></td>
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</tr>
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<tr>
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<td><strong>format.LHV1.bEnableVBR</strong></td>
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<td>Specifies if VBR encoding option shall be used or
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not, possible values are TRUE/FALSE</td>
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</tr>
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<tr>
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<td><strong>format.LHV1.nVBRQuality</strong></td>
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<td>Quality option if VBR is enabled (0=highest quality,
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9 is lowest quality)</td>
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</tr>
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<tr>
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<td><strong>format.LHV1.dwVbrAbr_bps</strong></td>
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<td>If the Average Bit Rate is specified, the lame
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encoder ignores the nVBRQuality settings</td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><strong>format.LHV1.bNoBitRes</strong></td>
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<td>Disables the bit-resorvoir and disables the insertion
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of padded frames</td>
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</tr>
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<tr>
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<td> </td>
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<td> </td>
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</tr>
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<tr>
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<td><b>format.mp3.btReserved</b></td>
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<td>For future use, set all elements to zero</td>
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</tr>
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</table>
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<p> </p>
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<p> </p>
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<hr>
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<h1><a name="beInitStream()"><font size="5">beInitStream()</font></a>
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</h1>
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<table border="0" cellspacing="16" width="100%">
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<tr>
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<td valign="top" width="20%"><b>Synopsis:</b></td>
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<td valign="top" width="80%">BE_ERR beInitStream(
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PBE_CONFIG <i>pbeConfig</i>, PDWORD <i>dwSamples</i>,
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PDWORD <i>dwBufferSize</i>, PHBE_STREAM <i>phbeStream</i>
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)</td>
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</tr>
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<tr>
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<td valign="top" width="20%"><b>Parameters:</b></td>
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<td valign="top" width="80%"><table border="0"
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cellspacing="10" width="100%">
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<tr>
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<td valign="top" width="20%"><i>pbeConfig</i></td>
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<td>Pointer at the struct containing encoder
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settings.</td>
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</tr>
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<tr>
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<td valign="top"><i>dwSamples</i></td>
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<td>Pointer at double word where number of
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samples to send to each <i>beEncodeChunk()</i> is
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returned.</td>
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</tr>
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<tr>
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<td valign="top"><i>dwBufferSize</i></td>
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<td>Pointer at double word where minimum size in
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bytes of output buffer is returned.</td>
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</tr>
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<tr>
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<td valign="top"><i>phbeStream</i></td>
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<td>Pointer at integer where Stream handle is
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returned.</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr>
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<td valign="top" width="20%"><b>Description:</b></td>
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<td valign="top" width="80%">This function is the first
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to call before starting an encoding stream.</td>
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</tr>
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</table>
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<hr>
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<h1><a name="beEncodeChunk()"><font size="5">beEncodeChunk()</font>
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</a></h1>
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<table border="0" cellspacing="16" width="100%">
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<tr>
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<td valign="top" width="20%"><b>Synopsis:</b></td>
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<td valign="top" width="80%">BE_ERR beEncodeChunk(
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HBE_STREAM <i>hbeStream</i>, DWORD <i>nSamples</i>,
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PSHORT <i>pSamples</i>, PBYTE <i>pOutput</i>, PDWORD <i>pdwOutput</i>
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)</td>
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</tr>
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<tr>
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<td valign="top" width="20%"><b>Parameters:</b></td>
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<td valign="top"><table border="0" cellspacing="10"
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width="100%">
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<tr>
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<td valign="top" width="20%"><i>hbeStream</i></td>
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<td width="80%">Handle of the stream.</td>
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</tr>
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<tr>
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<td valign="top" width="90"><i>nSamples</i></td>
|
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<td>Number of samples to be encoded for this
|
|
call. This should be identical to what is
|
|
returned by <i>beInitStream()</i>, unless you are
|
|
encoding the last chunk, which might be smaller.</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="90"><i>pSamples</i></td>
|
|
<td>Pointer at the 16-bit signed samples to be
|
|
encoded. These should be in stereo when encoding
|
|
a stereo MP3 and mono when encoding a mono MP3.</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="90"><i>pOutput</i></td>
|
|
<td>Where to write the encoded data. This buffer
|
|
should be at least of the minimum size returned
|
|
by <i>beInitStream()</i>.</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="90"><i>pdwOutput</i></td>
|
|
<td>Where to return number of bytes of encoded
|
|
data written. The amount of data written might
|
|
vary from chunk to chunk.</td>
|
|
</tr>
|
|
</table>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Description:</b></td>
|
|
<td valign="top">Encodes a chunk of samples. <i>Please
|
|
note that if you have set the output to generate mono MP3
|
|
files you must feed beEncodeChunk() with mono samples!</i></td>
|
|
</tr>
|
|
</table>
|
|
|
|
<hr>
|
|
|
|
<h1><a name="beDeinitStream()"><font size="5">beDeinitStream()</font>
|
|
</a></h1>
|
|
|
|
<table border="0" cellspacing="16" width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Synopsis:</b></td>
|
|
<td valign="top" width="80%">BE_ERR beDeinitStream(
|
|
HBE_STREAM <i>hbeStream</i>, PBYTE <i>pOutput</i>, PDWORD
|
|
<i>pdwOutput</i> )</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Parameters:</b></td>
|
|
<td valign="top"><table border="0" cellspacing="10"
|
|
width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><i>hbeStream</i></td>
|
|
<td width="80%">Handle of the stream.</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><i>pOutput</i></td>
|
|
<td>Where to write the encoded data. This buffer
|
|
should be at least of the minimum size returned
|
|
by <i>beInitStream()</i>.</td>
|
|
</tr>
|
|
<tr>
|
|
<td><i>pdwOutput</i></td>
|
|
<td>Where to return number of bytes of encoded
|
|
data written.</td>
|
|
</tr>
|
|
</table>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Description:</b></td>
|
|
<td valign="top">This function should be called after
|
|
encoding the last chunk in order to flush the encoder. It
|
|
writes any encoded data that still might be left inside
|
|
the encoder to the output buffer. This function should
|
|
NOT be called unless you have encoded all of the chunks
|
|
in your stream.</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<hr>
|
|
|
|
<h1><a name="beCloseStream()"><font size="5">beCloseStream()</font></a>
|
|
</h1>
|
|
|
|
<table border="0" cellspacing="16" width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Synopsis:</b></td>
|
|
<td valign="top">BE_ERR beCloseStream( HBE_STREAM <i>hbeStream</i>
|
|
)</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="90"><b>Parameters:</b></td>
|
|
<td valign="top"><table border="0" cellspacing="10"
|
|
width="100%">
|
|
<tr>
|
|
<td width="20%"><i>hbeStream</i></td>
|
|
<td>Handle of the stream.</td>
|
|
</tr>
|
|
</table>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top" width="90"><b>Description:</b></td>
|
|
<td valign="top">Last function to be called when finished
|
|
encoding a stream. Should unlike <i>beDeinitStream()</i>
|
|
also be called if the encoding is canceled.</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<hr>
|
|
|
|
<h1><a name="beVersion()"><font size="5">beVersion()</font> </a></h1>
|
|
|
|
<table border="0" cellspacing="16" width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Synopsis:</b></td>
|
|
<td valign="top">VOID beVersion( PBE_VERSION <i>pbeVersion</i>
|
|
)</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><b>Parameters:</b></td>
|
|
<td valign="top"><table border="0" cellspacing="10"
|
|
width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><i>pbeVersion</i></td>
|
|
<td>Pointer at struct where version number,
|
|
release date and URL for homepage is returned.</td>
|
|
</tr>
|
|
</table>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><b>Description:</b></td>
|
|
<td valign="top">Returns information like version numbers
|
|
(both of the DLL and encoding engine), release date and
|
|
URL for lame_enc's homepage. All this information should
|
|
be made available to the user of your product through a
|
|
dialog box or something similar.</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p> </p>
|
|
|
|
<hr>
|
|
|
|
<p> </p>
|
|
|
|
<h1><a name="beWriteVBRHeader()"><font size="5">beWriteVBRHeader()</font>
|
|
</a></h1>
|
|
|
|
<table border="0" cellspacing="16" width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><b>Synopsis:</b></td>
|
|
<td valign="top">VOID beWriteVBRHeader( LPCSTR <i>pszMP3FileName</i>
|
|
)</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><b>Parameters:</b></td>
|
|
<td valign="top"><table border="0" cellspacing="10"
|
|
width="100%">
|
|
<tr>
|
|
<td valign="top" width="20%"><i>pszMP3FileName</i></td>
|
|
<td>Const Pointer zero terminated string, that
|
|
contains the MP3 file name.</td>
|
|
</tr>
|
|
</table>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><b>Description:</b></td>
|
|
<td valign="top">Writes a Xing Header in front of the MP3
|
|
file. Make sure that the MP3 file is closed, and the the
|
|
beConfig.format.LHV1.bWriteVBRHeader has been set to
|
|
TRUE. In addition, it is always save to call
|
|
beWriteVBRHeader after the encoding has been finished,
|
|
even when the beConfig.format.LHV1.bWriteVBRHeader is not
|
|
set to TRUE</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p> </p>
|
|
|
|
<p> </p>
|
|
|
|
<hr>
|
|
|
|
<p> </p>
|
|
|
|
<h1><a name="Lame_enc.dll debug option">Lame_enc.dll debug option</a></h1>
|
|
|
|
<p>The lame_enc.dll has a built-in debug options, that dumps all
|
|
the important internal settings to a text file. To enable this
|
|
feature, create a text file in the Windwos directory which is
|
|
named lame_enc.ini, and should contain the following two lines</p>
|
|
|
|
<p>[debug]<br>
|
|
WriteLogFile=1</p>
|
|
|
|
<p>Save this text file, and each time you encode a file, the
|
|
settings are added to a file name lame_enc.txt, that is located
|
|
in the same directory as the lame_enc.dll</p>
|
|
|
|
<p> </p>
|
|
|
|
<p> </p>
|
|
|
|
<p> </p>
|
|
|
|
<p> </p>
|
|
|
|
<p> </p>
|
|
|
|
<p><br>
|
|
</p>
|
|
</body>
|
|
</html>
|