#Test task for Streaming Engineer candidates

#1) Implement multi-client TCP server console application for MPEG-2 Transport

Streams broadcasting

#(main platform is Windows, but it will be a plus if application could be compiled

and run on multiple platforms: Windows and Linux):

#Application must contain: DLL – server engine and console. #Application must use MPEG-2 Transport Streams as multimedia content for the clients. #Server must send MPEG-2 TS stream with correct data rate for given multimedia file; #server must ‘detect’ MPEG-2 TS files, and do not proceed with others (TS packet

size is 188 bytes, sync byte is: 0x47); server must start data transfer from

the first valid TS packet.

Åñëè âû íå ðàáîòàëè ñ MPEG-2 êîíòåéíåðàìè, òîãäà äëÿ Âàñ êðèòåðèé âàëèäíîñòè

ýòî ñèíê áàéò 0x47 (÷òîáû ïîíÿòü ÷òî ñòðèì ðåàëüíî âàëèäíûé íåîáõîäèìî íàéòè

ïî-êðàéíåé ìåðå 5 òàêèõ ïàêåòèêîâ, åñëè ôàéë áûë îáðåçàí íå êîððåêòíî, ò.å. ïåðâûé

áàéò èñõîäíîãî ñòðèìà íå 0x47, ìîäóëü äîëæåí âûêèíóòü “ìóñîð”; òàê æå ñóùåñòâóþò

MPEG-2 TS ñòðèìû â êîòîðûõ ðàçìåð ïàêåòà íå 188 áàéò, à 192 èëè 204, â ýòîì

ñëó÷àå ïåðåä ñèíê áàéòîì ïðèñóòñòâóþò ðàçë÷èíûå ñëóæåáíûå äàííûå íå ÿâëÿþùèåñÿ

“ìóñîðîì” – Âàì íóæíî ðàáîòàòü òîëüêî ñî 188 áàéòîâûìè ïàêåòàìè).

Candidate could use one of the following methods to get bitrate information for the

source file: 1) Put additional text file with pre-calculated bitrate inside, which

server will read and use; 2) Parse MPEG-2 Transport Stream to extract all required

data. Console application must be able to handle multiple TCP client connections

simultaneously. That application must be developed in C++. STL/Boost should be used.

Application must be multithread. Output log should be on screen and into file as well:

current client count, total network channel usage, network channel usage per

client – all these fields must be updated in real time.

#2) Implement TCP client console application for dumping data into file (main

platform is Windows, but it will be a plus if application could be compiled and

run on multiple platforms: Windows and Linux):

#This is a client for server from the first task. #Application must contain: DLL – client engine and console. Application must use

command line for initialization (for example: client_app.exe tcp://10.11.11.11:1025).

Application must handle wrong initialization settings correctly and show usage when

necessary parameter is missing.

Received file must be identical to the source one. Output log should be on screen only

and contains the following information: current download speed

#(that value must be updated in real time during receiving), time spent for receiving,

total bytes received.