玩 WebRTC 的时候发现它居然内置支持了 DTMF 拨号音。
这里就简单科普一下，DTMF 就是手机电话拨号音，数字按键按下去嘟嘟嘟响那个。具体就2个频率调谐：
| DTMF | 1209Hz | 1336Hz | 1477Hz | 1633Hz |
|---|---|---|---|---|
| 697Hz | 1 | 2 | 3 | A |
| 770Hz | 4 | 5 | 6 | B |
| 852Hz | 7 | 8 | 9 | C |
| 941Hz | * | 0 | # | D |
于是兴趣来了想做一个 demo 玩玩，写了半天调试不通，报错
VM987:1 Uncaught DOMException: Failed to execute 'insertDTMF' on 'RTCDTMFSender': The 'canInsertDTMF' attribute is false: this sender cannot send DTMF.
仔细研究了下这玩意，原来 WebRTC 不直接传音频，而是发一个控制信号，由接收方播放出音频，所以你需要本地创建一个真实的双工 RTC 并打开麦克风权限，才能播放DTMF音频。
WebRTC doesn't send DTMF codes as audio data. Instead, they're sent out-of-band, as RTP payloads. Note, however, that although it's possible to send DTMF using WebRTC, there is currently no way to detect or receive incoming DTMF. WebRTC currently ignores these payloads;
这样就走远了。于是又手痒用 AudioContext() 糊了一个。一共不到1000字节。
嗯。就挺简单的。特别是那个 oscillator有个 .stop(0.2) 参数可以避免 setTimeout 的麻烦。网上很多教程整复杂了。
btw 把一些老脚本挂在 lab 域名下。
btw2 把 RSS 改成全文输出了。