PureData 语言 MIDI 设备连接与消息解析 note on/CC 值读取

阿木博主一句话概括：PureData 语言与 MIDI 设备连接与消息解析技术探讨

阿木博主为你简单介绍：
PureData 是一款开源的图形化编程语言，广泛应用于音频处理、音乐制作和实时交互等领域。MIDI（Musical Instrument Digital Interface）是一种数字接口标准，用于电子乐器和其他音乐设备之间的通信。本文将探讨如何使用代码编辑模型在 PureData 中实现 MIDI 设备的连接与消息解析，包括 note-on 和 CC（Control Change）值的读取。

一、

PureData 的强大之处在于其简洁的图形化编程界面和丰富的音频处理功能。而 MIDI 设备的连接与消息解析是音乐制作和实时交互中不可或缺的一环。本文将详细介绍如何在 PureData 中实现 MIDI 设备的连接与消息解析，并通过代码示例进行说明。

二、PureData 与 MIDI 设备连接

1. 安装 PureData
确保您的计算机上已安装 PureData。可以从 PureData 官网下载并安装最新版本。

2. 连接 MIDI 设备
在 PureData 中，可以通过以下步骤连接 MIDI 设备：

（1）打开 PureData，创建一个新的 patch；
（2）在 patch 中添加一个 [midiin] 对象，用于接收 MIDI 输入；
（3）将 [midiin] 对象的 outlet 连接到其他对象，如 [print] 对象，用于显示 MIDI 消息。

3. 检查 MIDI 设备
在连接 MIDI 设备后，可以通过以下步骤检查设备是否正常工作：

（1）打开一个 MIDI 设备，如电子琴或合成器；
（2）在 PureData 中，发送一个 note-on 消息，例如按下键盘上的一个键；
（3）观察 [print] 对象的输出，确认 MIDI 消息是否正确显示。

三、MIDI 消息解析

1. MIDI 消息格式
MIDI 消息由三个字节组成：状态字节、数据1字节和数据2字节。

- 状态字节：表示消息类型，如 note-on、note-off、CC 等；
- 数据1字节：表示 MIDI 通道（1-16）；
- 数据2字节：表示具体值，如音符值、CC 值等。

2. 解析 note-on 消息
以下是一个解析 note-on 消息的代码示例：

```
// 创建一个 patch
[ midiin ] [ print ];

// 添加一个子 patch，用于解析 note-on 消息
[ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd 0 0 0 ] [ pd