英文:
How to get correct device number for snd_rawmidi_open()?
问题
使用 amidi -l 命令，我得到了一些卡片的结果：
Dir 设备 名称
IO hw:2,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:3,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:4,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:5,0,0 Wireless USB Midi Tranceiver MI
我可以通过迭代声卡并使用 snd_card_get_longname() 比较卡片的名称来识别无线设备。但这些函数返回名称，而 snd_rawmidi_open 需要一个设备，即 hw:5,0,0。我如何迭代地确定无线收发器的设备号，以便在 snd_rawmidi_open 函数中使用它？
英文:
Using amidi -l I get a few card results:
Dir Device Name
IO hw:2,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:3,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:4,0,0 CLASSIC ORGAN CMK3 CLASSIC ORGA
IO hw:5,0,0 Wireless USB Midi Tranceiver MI
I am able to identify the wireless device through iterating through sound cards using snd_card_next(), and then comparing the names of the cards using snd_card_get_longname().
But these return names, whereas snd_rawmidi_open needs a Device, i.e. hw:5,0,0. How can I iteratively determine the device number for the Wireless Transceiver, so I can use it for the snd_rawmidi_open function?
答案1
得分: 1
解决方案是简单地收集从snd_card_next获取的卡索引，并将其转换为形式为hw:card_index, 0, 0的条目，即：
sprintf(name, "hw:%d, 0,0", card_index);
英文:
The solution is to simply collect the card index taken from snd_card_next, and turn it into an entry of the form hw:card_index, 0, 0, i.e.
sprintf(name, "hw:%d, 0,0", card_index);
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