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• configure : select avs2 parser for libdavs2 decoder

  13 juin 2022, par Zhao Zhili

  configure : select avs2 parser for libdavs2 decoder
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] configure

• Enable parser in FLV demuxer for H264 codec

  13 décembre 2013, par Alex Sukhanov

  Enable parser in FLV demuxer for H264 codec
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/flvdec.c

• uncertain behaviour of xml parser and ffmpeg streaming

  8 octobre 2013, par user2775836

  I am making an ios application to display live streaming from ip camera using ffmpeg libraries.I am also using http api requests and responses.the response is in xml format ,hence i am using xml parser to parse the response.I have two view controllers(first and second).I am initializing the xml parser at view did disappear function of the first view controller also i am calling the function to stop the streaming in view did disappear after xml parsing function.While navigating from first view controller to second view controller the xml parser gets initiated but the parsing response does not get completed .when i come back from second to first view controller and then navigate again to second view controller ,at that time the full response is parsed.Why the response gets parsed second time not first time and why is it parsing half first time.Please help.
  The code is as follows :

  - (void)viewDidDisappear:(BOOL)animated {
  
  
  
         [self parsing]; //call to parsing function
  
  
  
      [self.h264dec stopDecode]; //call to stop streaming
  
      self.h264dec = nil;
  
   }
  
  
  
  parsing function is:
  
  
  
  -(void)parsing
  
  {
  
      NSString *urlString = [NSString stringWithFormat:@"http://www.example.com"];
  
      NSURL *url = [NSURL URLWithString:urlString];
  
  
  
  
  
      NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
  
  
  
      [theRequest addValue: @"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
  
      [theRequest setHTTPMethod:@"GET"];
  
  
  
      NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
  
  
  
      if( connection )
  
      {
  
          mutableData = [[NSMutableData alloc] init];
  
          NSLog(@"connection successful");
  
      }
  
  
  
  }
  
  
  
  -(void) connection:(NSURLConnection *) connection didReceiveResponse:(NSURLResponse *)response
  
  {
  
      NSLog(@"receive response");
  
  }
  
  -(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
  
  {
  
  
  
      [mutableData appendData:data];
  
      NSLog(@"DIDRECEIVE");
  
      NSLog(@"the mutable data is: %@",mutableData);
  
  
  
  }
  
  
  
  -(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
  
  {
  
       return;
  
  }
  
  
  
  -(void)connectionDidFinishLoading:(NSURLConnection *)connection
  
  {
  
      NSLog(@"finish loading");
  
  
  
      // You can do your functions here. If your repines is in XML you have to parse the response using NSXMLParser. If your response in JSON you have use SBJSON.
  
      NSXMLParser *parser = [[NSXMLParser alloc] initWithData:mutableData];
  
      [parser setDelegate:self];
  
      [parser parse];
  
  
  
  }
  
  
  
      - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
  
      {
  
  
  
          if([elementName isEqualToString:@"Response"]){
  
              NSLog(@"item found");
  
              xmlStringFileObject =[[XMLStringFile alloc]init];
  
          }
  
  
  
      }
  
  
  
      - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
  
      {
  
  
  
            [nodecontent appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet    whitespaceAndNewlineCharacterSet]]];
  
          NSLog(@"node content = %@",nodecontent);
  
      }
  
  
  
      //bellow delegate method specify when it encounter end tag of specific that tag
  
  
  
      - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
  
      {
  
          //I am saving my nodecontent data inside the property of XMLString File class
  
           if([elementName isEqualToString:@"test"]){
  
              xmlStringFileObject.test=nodecontent;
  
              NSLog(@"test:%@",xmlStringFileObject.test);
  
          }
  
  
  
          else if([elementName isEqualToString:@"resolution"]){
  
              xmlStringFileObject.resolution=nodecontent;
  
              NSLog(@"resolution:%@",xmlStringFileObject.resolution);
  
              AppDelegate *app = (AppDelegate*) [[UIApplication sharedApplication]delegate];
  
              app.res = xmlStringFileObject.resolution;
  
              NSLog(@"THE APPDELEGATE RES VALUE IS:%@",app.res);
  
          }
  
  
  
              //finally when we reaches the end of tag i am adding data inside the NSMutableArray
  
          if([elementName isEqualToString:@"Response"]){
  
              [rssOutputData addObject:xmlStringFileObject];
  
  
  
              xmlStringFileObject = nil;
  
  
  
          }
  
          //release the data from mutable string variable
  
  
  
  
  
          //reallocate the memory to get new content data from file
  
          nodecontent=[[NSMutableString alloc]init];
  
  
  
      }