Truyền âm thanh qua mạng internet

B(> GIAO Dl)C vA DAo T~O TRUONG D~I HOC DAN L!P NGO~I NGU - TIN HOC " ,,' ~ , THANH PHO HO CHI MINH LU!N VAN TOT NGHltp TRUYEN AM THANH QUA M~NG ' INTERNET xx , l' GIANG VIEN HlJoNG DAN: Th.S PH~M NGUYEN ANH HUY } SINH VIEN THue : TRAN MINH eu'ONG HIEN *XX ~ ~ ~ L -,' " ~ ," • ~' " '~ , , ~ , THANH PHO HO CHI MINH - 2002 ~ ••• ? LOICAMON Em xin tran tr9ng gi'ti lai cam an chan dtn thay PlliJM NGUYEN ANH HUY dii tq,n tinh giup va huang dan em hoan luq,n van t6t nghi?p Em cang xin gzti lai cam an dtn cac thay co khoa Tin h9C dii cung cap cho em nhilng kitn thz~ctrong su6t thai gian h9Ctq,p Tran Minh Cuang l MaC LaC • • LiJi md dt1u :l ~ ~ " A TONG QOAN VE DE TAl VA NQI DONG NGHIEN euo Chu'dng I: 1.1 T6ng quan v~ cong ngh~ va gidi thi~u v~ ung dl;lng - 1.2 NQi dung nghien cuu -2 Chu'dngII: Glal THI~O VE cAe eONG NGH~ DuQe sit DC)NG 2.1 User Datagram Protocol (UDP) 2.1.1 C(1'utrue eua thong di~p UDP 2.1.2 Phan tach g6i tin UDP -6 2.2 Transmission Control Protocol (TCP) - 2.3 Cac chuffn nen am - thoc;ti 2.3.1 Chudn nen G.729A 2.3.2 Chudn nen G.729B 2.3.3 Chudn nen G 723.1 10 2.3.4 Chudn nen GSM 06.10 11 2.4 Ke"tchuang -12 cAe GIAO THue Dude sit DONG Chu'dngIII: • vA eAO TRue Dcr LI~O 3.1 T6ng quan 3.2 Giao thuc Voive Transfer Datagram Protocol (VDP) 3.3 Giao thuc Telephone Connection Control Protocol (VTCP) giao thuc Remote Edu Control Protocol 3.4 Cffu truc dfi' li~u 14 14 va 15 17 II Chu'dngIV: sd no KHOI COA CHudNG TRiNH 4.1 Phan tfch ho~t dQng -4.2 Cac sa d6 khcSi TRiNH AM THANH TRUONG WINDOWS Chu'dng V: L~P vA ~NG 15 16 TREN MOl 5.1 L~p trlnh WINSOCK -42 5.1.1 T6ng quan v~ Socket 42 5.1.2 Windows Socket 43 5.1.3 Van d~ Blocking va Nonblocking 44 5.1.4 MQt s6 cac ham Winsock thuilng dung -45 5.1.4.1 Cac ham khiJi dQng va kef thuc mQt ring dl~tng -45 5.1.4.2 Cac ham chuyin d6i va cd siJ di1li~u -46 5.1.4.3 Ufy thong tin cua host 47 5.1.4.4 Thong tin v~ ten djch v¥ 48 5.1.4.5 Cac ham Socket 49 5.2 L~p trlnh thu phat am dl;lng cac ham chuffn cua Windows 53 5.2.1 GieJithi~u v~ Sound Blaster 16 53 5.2.2 Cac ham chu6n sit d¥ng di lijp trznh am -54 5.2.3 cdu truc WAVEFORMAT 56 5.2.4 AUDIO MIXERS -57 5.3 Ke't chuang -65 sa Chu'dng VI: HUaNG DAN sit DC)NG cAc CHudNG TRiNH • 6.1 Chuang trlnh Internet Telephone -6.2 Chuang trlnh Remote Education Chu'dng VII: nANH GIA vA KET L(I~N 67 72 III 7.1 Danh gia 7.2 KSt lu~n 7.3 Dinh huang pha t tri~n - Tili li~u tham khdo • 75 75 76 " ? ~ LOIMO BAD Ngay nay, cong nghf thong tin phdt triln vdi toe dQ cang tang Vifc ang dlJ,ng cong nghf thong tin cang bac thilt d6i vdi mQi nganh nghg ng tai nghien cau cong nghf truygn am qua mr;mgInternet (Intranet) cang la mQt trang nhT1nghl1dng phdt triln ma co khd nang dp dlJ,ng rtit rQng riii trang xii hQi Trang ph{lm vi lW7n van tot nghifp, em xin co' gdng trinh bay nhT1ng hilu bilt trang vifc nghien cau cong nghf truygn am qua m{lng va cdc ky thw7t 19p trznh dl vilt cdc chl1dng trznh nhdm mlJ,c tieu hifn thl!C hoa cong nghf I CHUONG I TOftG QVAft 1£ D£ TAl 1A ftOI OVftG ftGHltft CUV • ~ T6ng quan v€ cong ngh