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Testing and Issues

You can test this entry and submit issues during the testing period of the VoIP Contest, Round 1 contest.

Entries with serious issues will not be able to win the contest, but even minor issues might be important for overall results.




No modifications to external dependencies, including libtgvoip -- AudioDataCallbacks is used instead. Only one external dependency for runtime -- libopusfile0. The final binaries strip'ed just to minimize the archive.

There are 2 types of dependencies:
- deb-packages.txt -- to run tgvoipcall and tgvoiprate;
- src/deb-packages.txt -- to build tgvoipcall and tgvoiprate.

In addition to Debian packages, there are 2 libraries that are built from sources. They are required by tgvoipcall both and downloaded by CMake/Make automatically:
- libtgvoip (to maintain Telegram calls; used exactly d4a0f719 commit);
- libopusenc (to encode PCM to OGG).

To build run `cmake . && make` inside src/tgvoipcall or src/tgvoiprate after installing src/deb-packages.txt dependencies.
In addition, tgvoipcall has an optional parameter -n which allows changing the Network Type. It's WiFi by default, but can be changed without recompiling. In my experience, it's important option, so I decided to allow setting it up from the command line like other parameters.

Also, it has another trick -- eventfd -- a mutex/semaphore with read/write primitives. It allows for preventing an extra CPU load while waiting for the finish of the transmission/receiving.

Also, there are no extra timers/sleeps for timeouts -- internal timers of libtgvoip are used instead.
tgvoiprate uses a simple, but adequate linear combination of 2 heuristics:
- the measure of non-silent frames in the source and in the distorted copy;
- the measure of values in the magnitude specter of the source and of the distorted copy.

It's not ideal but has a very good ratio between simplicity and quality and gives adequate estimation in the majority of cases.
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Fair Wombat Nov 14, 2019 at 11:05
The submitted tgvoiprate app got a very good score of 335 and took the 1st place in the scoring table, receiving 5⭐️.
One minor issue was discovered with tgvoipcall: output was often empty due to timeouts. Adding the taskset -c 0prefix for launch command fixed this by forcing the program to run with one CPU core. The program likely wasn't optimized to run on a multi-CPU instance. -0.25⭐️
Result: 4.75⭐️
Mindful Pug Oct 31, 2019 at 22:39
Hello and thank you for the interest in my implementation. I'm sorry about non-informative the error message and will investigate how to avoid it.

Indeed, opusfile returns OP_EBADTIMESTAMP which means "The first or last granule position of a link failed basic validity checks.". Moreover, opusinfo outputs "WARNING: Samples with negative granpos in stream 1", i.e. the file is slightly corrupted. But I don't know at the moment the ways to ask opusfile to ignore this error. Once I find the answer, I'll post the solution.
Fair Wombat Nov 12, 2019 at 11:55
Was any external code used for tgvoiprate, which is subject to copyrights / patents / licensing?
Debian GNU/Linux 10 (buster)
Mindful Pug Nov 12, 2019 at 22:13
Thank you for your interest and your notification. In compare to libtgvoip, only 2 extra dependencies are used: libopusfile and libopusenc. Both of them are by Xiph.Org Foundation who maintains OPUS codec as well. According to and there are no such limitations which you are listed.
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