BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Mixing Wave buffers in a voice chat          BorlandTalk.com Forum Index -> Delphi Multimedia View previous topic :: View next topic   Author Message Ivan Babikov Guest Posted: Thu Jun 10, 2004 4:48 pm    Post subject: Mixing Wave buffers in a voice chat Hello all, I'm developing voice chat, so I need a way to mix several PCM buffers into one (for the case if the speakers are speaking vying with each other). As I understand to mix sounds in Windows I need to use Windows mixers but I cannot see any stream functions like MixerLineInWrite etc, as for WaveIn/Out or for ACM. So, where should I put the wave streams and how can I get the resulting stream? Thanks, Ivan. Back to top George Kashperko Guest Posted: Thu Jun 10, 2004 6:34 pm    Post subject: Re: Mixing Wave buffers in a voice chat Hi, Ivan. I sugges u can either do mixing with own code (calculate average value for each sample) or try to use DirectSound (build filter graph and mix your sources with MS PCM Audio Mixer and ten connect it to audio renderer device or whatever else to get media file instead). Good luck. Back to top Alex Lee Guest Posted: Thu Jun 24, 2004 11:56 pm    Post subject: Re: Mixing Wave buffers in a voice chat add the buf , e.g. AudioBuf1[] AudioBuf2[] for i := 0 to [] AudioBuf2[i] := AudioBuf2[i] + AudioBuf1[i] "Ivan Babikov" <babikov-nospam (AT) mail (DOT) ru> дÈëÓʼþ news:40c8913e (AT) newsgroups (DOT) borland.com... Quote: Hello all, I'm developing voice chat, so I need a way to mix several PCM buffers into one (for the case if the speakers are speaking vying with each other). As I understand to mix sounds in Windows I need to use Windows mixers but I cannot see any stream functions like MixerLineInWrite etc, as for WaveIn/Out or for ACM. So, where should I put the wave streams and how can I get the resulting stream? Thanks, Ivan. Back to top Ivan Babikov Guest Posted: Fri Jun 25, 2004 5:32 pm    Post subject: Re: Mixing Wave buffers in a voice chat Quote: for i := 0 to [] AudioBuf2[i] := AudioBuf2[i] + AudioBuf1[i] People say, that is's better to divide the data to avoid overloading and that sqrt(N) is better than N here (N- is the number of voices). for i := 0 to [] AudioBuf2[i] := (AudioBuf2[i] div sqrt(2) + AudioBuf1[i] div sqrt(2)) Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Multimedia All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.