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        从 C++ 发送 midi 消息

        send midi messages from C++(从 C++ 发送 midi 消息)

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                • 本文介绍了从 C++ 发送 midi 消息的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!


                  我使用的是树莓派,所以它有点像 Debian (Raspbian)

                  I'm using a raspberry pi, so it is sort of Debian (Raspbian)

                  我有一个正在运行的合成器 (Zynaddsubfx),我想通过代码向他发送 MIDI 消息并让它为我播放音乐.为此,我将使用 ALSA.

                  I have a synthesizer running (Zynaddsubfx) and I want to send him midi messages from code and have it playing the music for me. I will use ALSA for that.


                  I managed to create a "emitting port" in my program by doing:

                  snd_seq_create_simple_port(seq_handle, "My own sequencer",

                  现在我可以在 aconnect -ol 中看到 ZynSubAddFX,在 aconnect -il 中看到我自己的音序器.我可以连接它们:

                  now I can see ZynSubAddFX in aconnect -ol and my own sequencer in aconnect -il. And I'm able to connect them:

                  pi@cacharro:~/projects/tests$ aconnect 129:0 128:0
                  pi@cacharro:~/projects/tests$ Info, alsa midi port connected

                  为此,正如 CL 所建议的那样,我使用打开的 snd_seq_open,存储序列,然后使用 snd_seq_create_simple_port .. 但是:

                  for doing that, as sugested by CL I used opened snd_seq_open, stored the sequence and then used snd_seq_create_simple_port.. BUT :

                  正如之前所评论的,我只想在用户交互下向 zynsubaddfx 发送命令,因此创建队列、添加节奏等不是要走的路.

                  As commented before I just wanna send commands to zynsubaddfx under user interaction so creating queues, adding tempo and so on is not the way to go.

                  有没有办法通过我打开的端口发送简单的midi命令,比如note on/note off???

                  Is there a way to send simple midi comands like note on/note off through my opened port ???



                  To send some events at a specific time:

                  • 打开音序器;
                  • 创建您自己的(源)端口;
                  • 构建并发送一些事件.

                  要打开音序器,请调用 snd_seq_open.(您可以通过 snd_seq_client_id 获取您的客户编号.)

                  To open the sequencer, call snd_seq_open. (You can get your client number with snd_seq_client_id.)

                      snd_seq_t seq;
                      snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0);

                  要创建一个端口,分配一个端口信息对象snd_seq_port_info_alloca,设置端口参数snd_seq_port_info_set_xxx,并调用snd_seq_create_port.或者直接调用 snd_seq_create_simple_port.

                  To create a port, allocate a port info object with snd_seq_port_info_alloca, set port parameters with snd_seq_port_info_set_xxx, and call snd_seq_create_port. Or simply call snd_seq_create_simple_port.

                      int port;
                      port = snd_seq_create_simple_port(seq, "my port",
                              SND_SEQ_PORT_CAP_READ | SND_SEQ_POR_CAP_WRITE,

                  要发送一个事件,分配一个事件结构(只需对于更改,您可以使用本地 snd_seq_event_t 变量),并调用各种snd_seq_ev_xxx 函数来设置其属性.然后在发送完所有内容后调用 snd_seq_event_outputsnd_seq_drain_output事件.

                  To send an event, allocate an event structure (just for a change, you can use a local snd_seq_event_t variable), and call various snd_seq_ev_xxx functions to set its properties. Then call snd_seq_event_output, and snd_seq_drain_output after you've sent all events.

                      snd_seq_event_t ev;
                      /* either */
                      snd_seq_ev_set_dest(&ev, 64, 0); /* send to 64:0 */
                      /* or */
                      snd_seq_ev_set_subs(&ev);        /* send to subscribers of source port */
                      snd_seq_ev_set_noteon(&ev, 0, 60, 127);
                      snd_seq_event_output(seq, &ev);
                      snd_seq_ev_set_noteon(&ev, 0, 67, 127);
                      snd_seq_event_output(seq, &ev);

                  这篇关于从 C++ 发送 midi 消息的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!



                  C++ stl unordered_map implementation, reference validity(C++ stl unordered_map 实现,参考有效性)
                  C++: Is it possible to use a reference as the value in a map?(C++:是否可以使用引用作为映射中的值?)
                  Where ampersand quot;amp;quot; can be put when passing argument by reference?(其中符号“amp;通过引用传递参数时可以放置吗?)
                  Why can a non-const reference parameter be bound to a temporary object?(为什么可以将非常量引用参数绑定到临时对象?)
                  What is a dangling reference?(什么是悬空引用?)
                  C++ reference changes when push_back new element to std::vector(当 push_back 新元素到 std::vector 时,C++ 引用发生变化)

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