However, there are several great video calling alternatives that do work on Windows. Here are several that are available on Windows, macOS, Android, and iOS, so you can get some face time with almost anyone. A couple are even available for Linux. The Best Tech Newsletter Anywhere. Join , subscribers and get a daily digest of news, comics, trivia, reviews, and more.
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- Question Info.
Extensions are not supposed to depend on the RTP payload to be interpreted, and extensions are often used to transmit network or display features. Some examples of supported extensions include the orientation extension, which tells the endpoint the orientation of the receiving device and the mute extension, which tells the endpoint whether the receiving device is muted. Extensions mean that even if it is possible to determine the payload type, marker and SSRC of data, this is not sufficient to replay the exact packet that was sent.
Moreover, FaceTime creates extensions after the packet is encrypted, so it is not possible to create the complete RTP packet by hooking CCCryptorUpdate, because extensions could be added later.
Make calls in FaceTime on Mac
At this point, it seemed necessary to hook sendmsg as well as CCCryptorUpdate. This would allow the outgoing RTP header to be modified once it is complete. There were a few challenges in doing this. To start, audio and video packets are sent by different threads in FaceTime, and can be reordered between the time they are encrypted and the time they are sent by sendmsg. Otherwise, the process is the same as on older systems. I ended up implementing a solution that recorded packets by recording the unencrypted payload, and then recorded its RTP header, and using a snippet of the encrypted payload to pair headers with the correct unencrypted payload.
Then to replay packets, the packets encrypted in CCCryptorUpdate were replaced with the logged packets, and once the encrypted payload came through to sendmsg, the header was replaced with the logged one for that payload. Fortunately, the two streams with unique SSRCs used by FaceTime do not share any payload types, so it was possible to determine the new SSRC for each stream by waiting for an incoming packet with the correct payload type.
Then in each subsequent packet, the SSRC was replaced with the correct one.
Unfortunately, this still did not replay a FaceTime call correctly, and calls often experienced decryption failures. I eventually determined that audio and video on FaceTime are encrypted with different keys, and updated the replay script to queue the CCCryptor used by CCCryptorUpdate function based on whether it was audio or video content.
Then in sendmsg, the entire logged RTP packet, including the unencrypted payload, was copied into the outgoing packet, the SSRC was fixed, and then the payload encrypted with the next CCCryptor out of the appropriate queue. At this point, it was possible to stop using the modified AVConference binary, as all the packet modification was now happening in sendmsg. This implementation still had reliability problems. Digging more deeply into how FaceTime encryption works, packets are encrypted in CTS mode, which requires a counter. The counter is initialized to a unique value for each packet that is sent.
During the initialization of the RTP stream, the peers exchange two byte random tokens, one for audio and one for video.
The counter value for each packet is then calculated by exclusive or-ing the token with several values found in the packet, including the SSRC and the sequence number. Let us innovate and come up with the ideas and then do the work for you so you can focus your efforts elsewhere.
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