audio - iOS Remove Particular Sound from a video -

-

i have application plays audio , records video+audio while sound playing. figure out way process video audio picked microphone removed resulting video.

for example, if i'm playing audioa, , recording videob audiob (from microphone), want somehow cancel out audioa resulting audiob, audiob ambient noise , not noise device speakers.

any idea if there's way this?

bonus points if can done without offline processing.

you have deal playback part. here code mix selected audio recorded video.

- (void)mixaudio:(avasset*)audioasset starttime:(cmtime)starttime withvideo:(nsurl*)inputurl affinetransform:(cgaffinetransform)affinetransform  tourl:(nsurl*)outputurl outputfiletype:(nsstring*)outputfiletype withmaxduration:(cmtime)maxduration withcompletionblock:(void(^)(nserror *))completionblock {     nserror * error = nil;     avmutablecomposition * composition = [[avmutablecomposition alloc] init];      avmutablecompositiontrack * videotrackcomposition = [composition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid];      avmutablecompositiontrack * audiotrackcomposition = [composition addmutabletrackwithmediatype:avmediatypeaudio preferredtrackid:kcmpersistenttrackid_invalid];      avurlasset * fileasset = [avurlasset urlassetwithurl:inputurl options:[nsdictionary dictionarywithobject:[nsnumber numberwithbool:yes] forkey:avurlassetpreferprecisedurationandtimingkey]];      nsarray * videotracks = [fileasset trackswithmediatype:avmediatypevideo];      cmtime duration = ((avassettrack*)[videotracks objectatindex:0]).timerange.duration;      if (cmtime_compare_inline(duration, >, maxduration)) {         duration = maxduration;     }      (avassettrack * track in [audioasset trackswithmediatype:avmediatypeaudio]) {         [audiotrackcomposition inserttimerange:cmtimerangemake(starttime, duration) oftrack:track attime:kcmtimezero error:&error];          if (error != nil) {             completionblock(error);             return;         }     }      (avassettrack * track in videotracks) {         [videotrackcomposition inserttimerange:cmtimerangemake(kcmtimezero, duration) oftrack:track attime:kcmtimezero error:&error];          if (error != nil) {             completionblock(error);             return;         }     }      videotrackcomposition.preferredtransform = affinetransform;      avassetexportsession * exportsession = [[avassetexportsession alloc] initwithasset:composition presetname:avassetexportpresetpassthrough];     exportsession.outputfiletype = outputfiletype;     exportsession.shouldoptimizefornetworkuse = yes;     exportsession.outputurl = outputurl;      [exportsession exportasynchronouslywithcompletionhandler:^ {         nserror * error = nil;         if (exportsession.error != nil) {             nsmutabledictionary * userinfo = [nsmutabledictionary dictionarywithdictionary:exportsession.error.userinfo];             nsstring * sublocalizeddescription = [userinfo objectforkey:nslocalizeddescriptionkey];             [userinfo removeobjectforkey:nslocalizeddescriptionkey];             [userinfo setobject:@"failed mix audio , video" forkey:nslocalizeddescriptionkey];             [userinfo setobject:exportsession.outputfiletype forkey:@"outputfiletype"];             [userinfo setobject:exportsession.outputurl forkey:@"outputurl"];             [userinfo setobject:sublocalizeddescription forkey:@"causelocalizeddescription"];              [userinfo setobject:[avassetexportsession allexportpresets] forkey:@"allexportsessions"];              error = [nserror errorwithdomain:@"error" code:500 userinfo:userinfo];         }          completionblock(error);     }]; }

Comments

Post a Comment

Popular posts from this blog

java - Custom OutputStreamAppender not run: LOGBACK: No context given for <MYAPPENDER> -

-
i wish write custom appender on basis of outputstreamappender . wrote following class package tests; import java.io.ioexception; import java.io.outputstream; import ch.qos.logback.core.outputstreamappender; public class myappender<e> extends outputstreamappender<e> { public myappender() { system.out.println("myappender created"); setoutputstream(new outputstream() { @override public void write(int b) throws ioexception { throw new unsupportedoperationexception(); } }); } } then wrote following runner: package tests; import org.slf4j.loggerfactory; import ch.qos.logback.classic.logger; public class runner { private static final logger log = (logger) loggerfactory.getlogger(runner.class); public static void main(string[] args) { //log.addappender(new myappender<iloggingevent>()); log.info("hello world"); } } finall...
Read more

java - UML - How would you draw a try catch in a sequence diagram? -

-
Image
is there standard way of drawing try catch sequence diagrams? i've made attempt based on this feel end result doesn't feel right. code diagram based around: public static void save () { try { filehandle filehandle = gdx.files.external(file); filehandle.writestring(boolean.tostring(constantshandler.soundenabled)+"\n", false); (int = 0; < 5; i++) { filehandle.writestring(integer.tostring(constantshandler.highscores[i])+"\n", true); } } catch (throwable e) { } } my attempt note: know still need add loop. that's ok. fragments meant show conditional control flow in sequence diagram. superstructures puts limitations on use of fragments (see pp. 467 of ss2.1.1). should use critical region try part above. , option catch . however, keep telling can take quite freedom in using uml. it's language , such changes in life time. long reader ge...
Read more

c++ - No viable overloaded operator for references a map -

-
i trying use map can make tag names reference number. when try , use it, in code error (6 in total every time reference map): src/main.cpp:25:45: error: no viable overloaded operator[] type 'std::map<std::string, std::string>' const char* idcs = node.child_value(tagmap[3]); this code: #include "pugi/pugixml.hpp" #include <iostream> #include <string> #include <map> int main() { pugi::xml_document doca, docb; std::map<std::string, pugi::xml_node> mapa, mapb; std::map<std::string, std::string> tagmap {{"1", "data"}, {"2", "entry"}, {"3", "id"}, {"4", "content"}}; if (!doca.load_file("a.xml") || !docb.load_file("b.xml")) { std::cout << "can't find input files"; return 1; } (auto& node: doca.child(tagmap[1]).children(tagmap[2])) { co...
Read more