{"id":1100,"date":"2009-12-24T15:07:50","date_gmt":"2009-12-24T13:07:50","guid":{"rendered":"https:\/\/alax.info\/blog\/?p=1100"},"modified":"2011-03-07T20:09:49","modified_gmt":"2011-03-07T18:09:49","slug":"directshow-spy-filter-mapper-spy","status":"publish","type":"post","link":"https:\/\/alax.info\/blog\/1100","title":{"rendered":"DirectShow Spy: Filter Mapper Spy"},"content":{"rendered":"

DirectShow Filter Graph Spy<\/a> was updated to add new functionality: spying over another DirectShow object – Filter Mapper<\/a>. Filter Mapper object is used for filter registration purposes and also internally by DirectShow’s Intelligent Connect<\/a>. IFilterMapper2<\/a> interface traces provide detailed description on steps DirectShow takes in order to connect and\/or render filter pins. For example when trying to render MEDIATYPE_Audio<\/em> pin, Filter Mapper suggested “RDP DShow Redirection Filter” and, then, “Default DirectSound Device”:<\/p>\n

FilterMapperSpy.<\/span>h(<\/span>186<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> nFlags 0x0,<\/span> bExactMatch 0<\/span>,<\/span> nMinimalMerit 0x00200001,<\/span> bInputNeeded 1<\/span>,<\/span> nInputTypeCount 1<\/span>,<\/span> pInputPinCategory NULL,<\/span> bRender 1<\/span>,<\/span> bOutputNeeded 0<\/span>,<\/span> nOutputTypeCount 0<\/span>,<\/span> pOutputPinCategory NULL\r\nFilterMapperSpy.<\/span>h(<\/span>191<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> nInputTypeIndex 0<\/span>,<\/span> MajorType {<\/span>73647561<\/span>-<\/span>0000<\/span>-<\/span>0010<\/span>-<\/span>8000<\/span>-<\/span>00AA00389B71}<\/span>,<\/span> Subtype {<\/span>00000000<\/span>-<\/span>0000<\/span>-<\/span>0000<\/span>-<\/span>0000<\/span>-<\/span>000000000000<\/span>}<\/span>\r\nFilterMapperSpy.<\/span>h(<\/span>212<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> pMoniker @device:<\/span>sw:<\/span>{<\/span>083863F1-<\/span>70DE-<\/span>11D0-<\/span>BD40-<\/span>00A0C911CE86}<\/span>\\<\/span>{<\/span>AB9D6472-<\/span>752F-<\/span>43F6-<\/span>B29E-<\/span>61207BDA8E06}<\/span>\r\nFilterMapperSpy.<\/span>h(<\/span>220<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> sFriendlyName \"<\/span>RDP DShow Redirection Filter<\/span>\"<\/span>,<\/span> sDescription \"<\/span>\"<\/span>,<\/span> sDevicePath \"<\/span>\"<\/span>\r\nFilterMapperSpy.<\/span>h(<\/span>212<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> pMoniker @device:<\/span>cm:<\/span>{<\/span>E0F158E1-<\/span>CB04-<\/span>11D0-<\/span>BD4E-<\/span>00A0C911CE86}<\/span>\\<\/span>Default DirectSound Device\r\nFilterMapperSpy.<\/span>h(<\/span>220<\/span>)<\/span>:<\/span> CFilterMapperSpy:<\/span>:<\/span>EnumMatchingFilters:<\/span> sFriendlyName \"<\/span>Default DirectSound Device<\/span>\"<\/span>,<\/span> sDescription \"<\/span>\"<\/span>,<\/span> sDevicePath \"<\/span>\"<\/span><\/pre>\n
Also, the binary is renamed from FilterGraphSpy.dll to DirectShowSpy.dll.<\/p>\n
Partial Visual C++ .NET 2008 source code is available from SVN<\/a>, release binary included (Win32<\/a>, x64<\/a>); installation instructions are in another post<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
DirectShow Filter Graph Spy was updated to add new functionality: spying over another DirectShow object – Filter Mapper. Filter Mapper object is used for filter registration purposes and also internally by DirectShow’s Intelligent Connect. IFilterMapper2 interface traces provide detailed description on steps DirectShow takes in order to connect and\/or render filter pins. For example when… <\/p>\n
Read the full article<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,13,12,10],"tags":[78,119,163,282,285,164],"class_list":["post-1100","post","type-post","status-publish","format-standard","hentry","category-audio","category-source","category-technology","category-video","tag-directshow","tag-filter","tag-graph","tag-hook","tag-mapper","tag-spy"],"_links":{"self":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/1100","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/comments?post=1100"}],"version-history":[{"count":0,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/1100\/revisions"}],"wp:attachment":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/media?parent=1100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/categories?post=1100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/tags?post=1100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Important is that DirectShow’s internals are using the mapper through COM instantiation and this provides a safe method to override default behavior process wide in order to, for example, extend Intelligent Connect<\/a> functionality onto custom, unregistered globally, private filters.<\/p>\n