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midi播放器

13 浏览量 2022-09-21 03:06:26 上传评论收藏 61KB ZIP 举报

MIDI（Musical Instrument Digital Interface）播放器是一种能够解析并播放MIDI文件的软件或硬件设备。MIDI文件并不是实际的音频数据，而是音乐指令序列，这些指令告诉音乐设备如何演奏音符、控制音量、改变音色等。在本文中，我们将探讨关于MIDI播放器的代码实现及其相关知识点。 MIDI播放器的核心是MIDI事件处理。MIDI事件包括音符开/关、控制器变化、程序变化等，它们由特定的MIDI消息类型表示。在源代码中，我们需要解析这些消息，然后根据消息内容生成对应的音频输出。这通常涉及到对MIDI规范的深入理解，例如MIDI消息的结构、每个消息类型的含义以及如何将它们转化为声音。在"midi.html"中，可能包含了MIDI播放器的用户界面设计，比如播放、暂停、停止按钮，音量控制滑块等。HTML可以用来构建UI布局，而JavaScript或其他前端脚本语言可以处理用户交互事件，如点击按钮或改变音量。JavaScript库如Web MIDI API（在现代浏览器中支持）可以用于与MIDI设备进行通信，实现MIDI数据的读取和播放。 "MIDI演示"可能是指"midi_demo.zip"中的内容，这可能包含了一些预设的MIDI文件，用于测试播放器的功能和性能。开发者可以通过这些示例文件检查播放器是否正确地解释和播放了各种类型的MIDI事件。 "MIDI源代码"可能指的是"midi_src.zip"，这可能是一个完整的MIDI播放器项目的源代码包。源代码通常会分为几个部分，包括MIDI文件解析模块，MIDI事件处理器，以及音频合成模块。解析模块负责读取和解码MIDI文件，事件处理器将解析出的事件转化为指令，音频合成模块则将这些指令转化为可听的音频信号。在实现MIDI播放器时，开发者可能需要关注以下几点： 1. MIDI文件格式：理解MIDI文件的结构，如Header Chunk、Track Chunks和Meta Events。 2. MIDI消息：熟悉不同类型的MIDI消息，如Note On/Off、Controller Change、Program Change等。 3. 音频合成：可以选择软件合成（如FM合成、波表合成）或者硬件合成（如通过USB MIDI接口连接外部设备）。 4. Web MIDI API：如果是在浏览器环境中，了解如何使用API来处理MIDI输入和输出。 5. UI设计：创建用户友好的界面，允许用户控制播放、音量、速度等。开发一个MIDI播放器涉及了从文件解析到音频生成的多个技术环节，需要对MIDI标准有深入的理解，并具备编程和音频处理的知识。通过分析和实现这样的项目，开发者不仅可以提升技术能力，还能增强对音乐和数字音频世界的洞察。

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midi.zip （4个子文件）

midi.html 11KB

midi_src.zip 14KB

midi_demo.zip 43KB

www.pudn.com.txt 218B

<HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Zafir Anjum"> <TITLE>MFC Programmer's SourceBook : Static Controls</TITLE> <META Name="description" Content="Source code for various windows controls"> <META Name="keywords" Content=""> </HEAD> <SCRIPT LANGUAGE="JavaScript"> </SCRIPT> <body background="../fancyhome/back.gif" bgcolor="#FFFFFF" >  <TABLE width=100% border="0" cellpadding="0" cellspacing="0"> <TR> <TD> <ILAYER id=ad1 visibility=hidden height=60></ILAYER> <NOLAYER> <IFRAME SRC="http://www.spidersoft.com/ads/bwz468_60.htm" width="100%" height="60" marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></IFRAME> </NOLAYER> </TD> </TR> </TABLE>  <SCRIPT LANGUAGE="JavaScript"> </SCRIPT> <noscript> <a href="http://ad.doubleclick.net/jump/www.codeguru.com/controls;ord=No6iONFCY35kNQAAvpg"> <img src="http://ad.doubleclick.net/ad/www.codeguru.com/controls;ord=No6iONFCY35kNQAAvpg"></a> </noscript> <CENTER><H3> Playing MIDI Files Directly From The Resource </H3></CENTER><HR>  This article was contributed by <A HREF="mailto:[email protected]">Joerg Koenig</A>. <A NAME="ToTheTop"></A> <A HREF="#intro">Introduction</A> <A HREF="#publics">Public Interface</A> <A HREF="#virtuals">Overridables</A> <A HREF="#usage">Usage</A> <A HREF="#download">Download</A> <A HREF="#comments">Comments</A>   <H4><A NAME="intro"></A>Introduction (<A HREF="#ToTheTop">back to top</A>)</H4> This class is a slightly modified "spin off" from the <A HREF="http://www.codeguru.com/samples/CGTetris.shtml">CGTetris</A> application. It is based on a sample in the DirectX sdk (called mstream). The conversion into a C++ class makes it much easier to use. The CMIDI class makes it easy to play a MIDI file directly from the resource (without copying it into a temporary file). One can use the class to play MIDI files, too. In this case you have to load the entire file into memory and to pass the pointer to the beginning of the buffer to the Create() method. <H4><A NAME="publics"></A>Public Interface (<A HREF="#ToTheTop">back to top</A>)</H4> <TT>// create the MIDI object. You cannot use a MIDI object before</TT> <TT>// you've "Create()"ed one!</TT> <TT>BOOL Create(LPVOID pSoundData, DWORD dwSize, CWnd * pParent = 0);</TT> <TT>BOOL Create(LPCTSTR pszResID, CWnd * pParent = 0);</TT> <TT>BOOL Create(UINT uResID, CWnd * pParent = 0);</TT> <TT>// Play the MIDI file. Normally the playback will stop after</TT> <TT>// the MIDI played off.</TT> <TT>BOOL Play(BOOL bInfinite = FALSE);</TT> <TT>// usually you should never set "bReOpen" to FALSE</TT> <TT>// unless you're absolutly sure you will</TT> <TT>// not reuse the MIDI object. Normally only the</TT> <TT>// destructor of the class should set this flag</TT> <TT>BOOL Stop(BOOL bReOpen = TRUE);</TT> <TT>BOOL IsPlaying() const;</TT> <TT>BOOL Pause();</TT> <TT>BOOL Continue();</TT> <TT>BOOL IsPaused() const;</TT> <TT>// Set playback position back to the start</TT> <TT>// normally there is no need to call this method directly.</TT> <TT>BOOL Rewind();</TT> <TT>// Get the number of volume channels</TT> <TT>DWORD GetChannelCount() const;</TT> <TT>// Set the volume of a channel in percentage. (default 100%)</TT> <TT>// Channels can be addressed from 0 to (GetChannelCount()-1)</TT> <TT>void SetChannelVolume(DWORD channel, DWORD percent);</TT> <TT>// Get the volume of a channel (in percentage)</TT> <TT>DWORD GetChannelVolume(DWORD channel) const;</TT> <TT> </TT> <TT>// Set the volume for all channels in percentage</TT> <TT>void SetVolume(DWORD percent);</TT> <TT>// Get the average volume for all channels (in percentage)</TT> <TT>DWORD GetVolume() const;</TT> <TT>// Set the tempo of the playback. (default 100%)</TT> <TT>void SetTempo(DWORD percent);</TT> <TT>// Get the current tempo (in percentage)</TT> <TT>DWORD GetTempo() const;</TT> <TT>// You can (un)set an infinite loop during playback.</TT> <TT>// Note that "Play()" overrides this setting!</TT> <TT>void SetInfinitePlay(BOOL bSet = TRUE);</TT> The CMIDI class sends the message WM_MIDI_VOLUMECHANGED to its owner window (if one is set via Create()), if the volume changed during playback in another way than explicitly set by the class (a MIDI stream can control its volume by itself). The WPARAM parameter of the message is a pointer to the CMIDI object that sent the message. The LOWORD of the LPARAM parameter describes the channel that changed volume and the HIWORD is the new volume in percentage. The WM_MIDI_VOLUMECHANGED message is #define'd as WM_USER+23. <H4><A NAME="virtuals"></A>Overridables (<A HREF="#ToTheTop">back to top</A>)</H4> <TT>// NOTE THAT, IF YOU OVERRIDE ONE OF THESE METHODS, YOU MUST CALL</TT> <TT>// THE BASE CLASS IMPLEMENTATION, TOO!</TT> <TT>// called when a MIDI output device is opened</TT> <TT>virtual void OnMidiOutOpen();</TT> <TT> </TT> <BR