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• How to create a command – Introducing the Piwik Platform

  2 octobre 2014, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to publish your plugin or theme on the Piwik Marketplace). This time you’ll learn how to create a new command. For this tutorial you will need to have basic knowledge of PHP.

  What is a command ?

  A command can execute any task on the command line. Piwik provides currently about 50 commands via the Piwik Console. These commands let you start the archiver, change the number of available custom variables, enable the developer mode, clear caches, run tests and more. You could write your own command to sync users or websites with another system for instance.

  Getting started

  In this series of posts, we assume that you have already set up your development environment. If not, visit the Piwik Developer Zone where you’ll find the tutorial Setting up Piwik.

  To summarize the things you have to do to get setup :

  • Install Piwik (for instance via git).
  • Activate the developer mode : ./console development:enable --full.
  • Generate a plugin : ./console generate:plugin --name="MyCommandPlugin". There should now be a folder plugins/MyCommandPlugin.
  • And activate the created plugin under Settings => Plugins.

  Let’s start creating a command

  We start by using the Piwik Console to create a new command. As you can see there is even a command that lets you easily create a new command :

  ./console generate:command

  The command will ask you to enter the name of the plugin the created command should belong to. I will simply use the above chosen plugin name “MyCommandPlugin”. It will ask you for a command name as well. I will use “SyncUsers” in this example. There should now be a file plugins/MyCommandPlugin/Commands/Syncusers.php which contains already an example to get you started easily :

  class Syncusers extends ConsoleCommand
  {
      protected function configure()
      {
          $this->setName('mycommandplugin:syncusers');
          $this->setDescription('MyCommandPlugin');
          $this->addOption('name', null, InputOption::VALUE_REQUIRED, 'Your name:');
      }
   
      /**
       * Execute command like: ./console mycommandplugin:syncusers --name="The Piwik Team"
       */
      protected function execute(InputInterface $input, OutputInterface $output)
      {
          $name    = $input->getOption('name');
   
          $message = sprintf('Syncusers: %s', $name);
   
          $output->writeln($message);
      }
  }
  Télécharger

  Any command that is placed in the “Commands” folder of your plugin will be available on the command line automatically. Therefore, the newly created command can now be executed via ./console mycommandplugin:syncusers --name="The Piwik Team".

  The code template explained

  protected function configure()
  {
      $this->setName('mycommandplugin:checkdatabase');
      $this->setDescription('MyCommandPlugin');
      $this->addOption('name', null, InputOption::VALUE_REQUIRED, 'Your name:');
  }
  Télécharger

  As the name says the method configure lets you configure your command. You can define the name and description of your command as well as all the options and arguments you expect when executing it.

  protected function execute(InputInterface $input, OutputInterface $output)
  {
      $name    = $input->getOption('name');
      $message = sprintf('Syncusers: %s', $name);
      $output->writeln($message);
  }
  Télécharger

  The actual task is defined in the execute method. There you can access any option or argument that was defined on the command line via $input and write anything to the console via $output argument.

  In case anything went wrong during the execution you should throw an exception to make sure the user will get a useful error message. Throwing an exception when an error occurs will make sure the command does exit with a status code different than 0 which can sometimes be important.

  Advanced features

  The Piwik Console is based on the powerful Symfony Console component. For instance you can ask a user for any interactive input, you can use different output color schemes and much more. If you are interested in learning more all those features have a look at the Symfony console website.

  How to test a command

  After you have created a command you are surely wondering how to test it. Ideally, the actual command is quite short as it acts like a controller. It should only receive the input values, execute the task by calling a method of another class and output any useful information. This allows you to easily create a unit or integration test for the classes behind the command. We will cover this topic in one of our future blog posts. Just one hint : You can use another command ./console generate:test to create a test. If you want to know how to test a command have a look at the Testing Commands documentation.

  Publishing your Plugin on the Marketplace

  In case you want to share your commands with other Piwik users you can do this by pushing your plugin to a public GitHub repository and creating a tag. Easy as that. Read more about how to distribute a plugin and best practices when publishing a plugin.

  Isn’t it easy to create a command ? We never even created a file ! If you have any feedback regarding our APIs or our guides in the Developer Zone feel free to send it to us.

• record and play file using wrapper ffmpeg

  3 septembre 2014, par user1541069

  I am using C# wrapper for ffmpeg from ffmpeg
  I want record rtsp stream and play it but I can not decoder frame from file

  using this code I write file test.avi

   unsafe
  
          {
  
              AVFormatContext* context = FFmpegInvoke.avformat_alloc_context();
  
              int video_stream_index=0;
  
  
  
              FFmpegInvoke.av_register_all();
  
              FFmpegInvoke.avcodec_register_all();
  
              FFmpegInvoke.avformat_network_init();
  
  
  
              //open rtsp
  
              if (FFmpegInvoke.avformat_open_input(&context, "rtsp://admin:admin@192.168.0.71:554", null, null) != 0)
  
              {
  
                  return ;
  
              }
  
  
  
              if (FFmpegInvoke.avformat_find_stream_info(context, null) < 0)
  
              {
  
                  return ;
  
              }
  
  
  
              //search video stream
  
              for (int i = 0; i < context->nb_streams; i++)
  
              {
  
                  if (context->streams[i]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
  
                      video_stream_index = i;
  
              }
  
  
  
              AVPacket packet;
  
              FFmpegInvoke.av_init_packet(&packet);
  
  
  
              //open output file
  
              AVOutputFormat* fmt = FFmpegInvoke.av_guess_format("h264", null, null);
  
              AVFormatContext* oc = FFmpegInvoke.avformat_alloc_context();
  
              oc->oformat = fmt;
  
              FFmpegInvoke.avio_open2(&oc->pb, "test.mkv", FFmpegInvoke.AVIO_FLAG_WRITE, null, null);
  
  
  
              AVStream* stream = null;
  
              int cnt = 0;
  
              //start reading packets from stream and write them to file
  
  
  
           ///   FFmpegInvoke.av_read_play(context);//play RTSP
  
              while (FFmpegInvoke.av_read_frame(context, &packet) >= 0 && cnt < 1000)
  
              {//read 100 frames
  
  
  
  
  
                  if (packet.stream_index == video_stream_index)
  
                  {//packet is video               
  
                      if (stream == null)
  
                      {//create stream in file
  
  
  
                          stream = FFmpegInvoke.avformat_new_stream(oc, context->streams[video_stream_index]->codec->codec);
  
                          FFmpegInvoke.avcodec_copy_context(stream->codec, context->streams[video_stream_index]->codec);
  
                          stream->sample_aspect_ratio = context->streams[video_stream_index]->codec->sample_aspect_ratio;
  
                          FFmpegInvoke.avformat_write_header(oc, null);
  
                      }
  
                      packet.stream_index = stream->id;
  
                      var p1 = new FileInfo("test.mkv").Length;
  
                      FFmpegInvoke.av_write_frame(oc, &packet);
  
                      cnt++;
  
                  }
  
                  FFmpegInvoke.av_free_packet(&packet);
  
                  FFmpegInvoke.av_init_packet(&packet);
  
              }
  
              FFmpegInvoke.av_read_pause(context);
  
              FFmpegInvoke.av_write_trailer(oc);
  
              FFmpegInvoke.avio_close(oc->pb);
  
              FFmpegInvoke.avformat_free_context(oc);
  
          }

  and using this code I want to play me file

  unsafe{
  
  
  
  
  
              string url = "test.mkv";
  
  
  
              FFmpegInvoke.av_register_all();
  
              FFmpegInvoke.avcodec_register_all();
  
              FFmpegInvoke.avformat_network_init();
  
  
  
  
  
              AVFormatContext* pFormatContext = FFmpegInvoke.avformat_alloc_context();
  
              if (FFmpegInvoke.avformat_open_input(&pFormatContext, url, null, null) != 0)
  
                  throw new Exception("Could not open file");
  
  
  
              if (FFmpegInvoke.avformat_find_stream_info(pFormatContext, null) != 0)
  
                  throw new Exception("Could not find stream info");
  
              AVStream* pStream = null;
  
              for (int i = 0; i < pFormatContext->nb_streams; i++)
  
              {
  
                  if (pFormatContext->streams[i]->codec->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
  
                  {
  
                      pStream = pFormatContext->streams[i];
  
                      break;
  
                  }
  
              }
  
              var packet = new AVPacket();
  
              AVPacket* pPacket = &packet;
  
              FFmpegInvoke.av_init_packet(pPacket);
  
  
  
  
  
  
  
              AVCodecContext codecContext = *(pStream->codec);
  
              int width = codecContext.width;
  
              int height = codecContext.height;
  
              AVPixelFormat sourcePixFmt = codecContext.pix_fmt;
  
              AVCodecID codecId = codecContext.codec_id;
  
              var convertToPixFmt = AVPixelFormat.PIX_FMT_BGR24;
  
              SwsContext* pConvertContext = FFmpegInvoke.sws_getContext(width, height, sourcePixFmt,
  
                                                                         width, height, convertToPixFmt,
  
                                                                         FFmpegInvoke.SWS_FAST_BILINEAR, null, null, null);
  
              if (pConvertContext == null)
  
                  throw new Exception("Could not initialize the conversion context");
  
  
  
              var pConvertedFrame = (AVPicture*)FFmpegInvoke.avcodec_alloc_frame();
  
              int convertedFrameBufferSize = FFmpegInvoke.avpicture_get_size(convertToPixFmt, width, height);
  
              var pConvertedFrameBuffer = (byte*)FFmpegInvoke.av_malloc((uint)convertedFrameBufferSize);
  
              FFmpegInvoke.avpicture_fill(pConvertedFrame, pConvertedFrameBuffer, convertToPixFmt, width, height);
  
  
  
              AVCodec* pCodec = FFmpegInvoke.avcodec_find_decoder(codecId);
  
              if (pCodec == null)
  
                  throw new Exception("Unsupported codec");
  
  
  
              // Reusing codec context from stream info, 
  
              // as an alternative way it could look like this: (but it works not for all kind of codecs)
  
              // AVCodecContext* pCodecContext = FFmpegInvoke.avcodec_alloc_context3(pCodec);
  
              AVCodecContext* pCodecContext = &codecContext;
  
  
  
              if ((pCodec->capabilities & FFmpegInvoke.CODEC_CAP_TRUNCATED) == FFmpegInvoke.CODEC_CAP_TRUNCATED)
  
                  pCodecContext->flags |= FFmpegInvoke.CODEC_FLAG_TRUNCATED;
  
  
  
              AVFrame* pDecodedFrame = FFmpegInvoke.avcodec_alloc_frame();
  
  
  
              if (FFmpegInvoke.av_read_frame(pFormatContext, pPacket) < 0)
  
                  throw new System.IO.EndOfStreamException();
  
              int gotPicture = 0;
  
              int size = FFmpegInvoke.avcodec_decode_video2(pCodecContext, pDecodedFrame, &gotPicture, pPacket);
  
              if (size < 0)
  
                  throw new Exception(string.Format("Error while decoding frame "));
  
  
  
              if (gotPicture == 1)
  
              {
  
  
  
              }

  size =-22.Why ? what is wrong ?How play my file using ffmpeg ?

• Anomalie #3325 : (array) n’est pas suffisant pour convertir l’objet récupéré par l’itérateur YQL

  29 octobre 2014, par Sylvain Lesage

  L’URL est mal écrite, c’est : http://core.spip.org/projects/spip/repository/entry/spip/ecrire/iterateur/data.php#L563.

  J’ai pas le dépôt SVN sous la main, mais le patch en gros pourrait être remplacer à la ligne 547

  /**
   * yql -> tableau
   * @throws Exception
   * @param  string $u
   * @return array|bool
   */
  function inc_yql_to_array_dist($u) 
      define(’_YQL_ENDPOINT’, ’http://query.yahooapis.com/v1/public/yql?&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&q=’) ;
      $v = recuperer_url($url = _YQL_ENDPOINT.urlencode($u).’&format=json’) ;
      if (!$v[’page’]
        OR !$w = json_decode($v[’page’],true)) 
          throw new Exception(’YQL : r&#233 ;ponse vide ou mal form&#233 ;e’) ;
      
      if (isset($w[’error’]))
          throw new Exception($w[’error’][’description’]) ;
      
      return (array) $w ;
  
  

  par

  /**
   *
   * Convert an object to an array
   *
   * @param    object  $object The object to convert
   * @return   array
   *
   */
  function inc_object_to_array( $object ) 
      if( !is_object( $object ) && !is_array( $object ) ) 
          return $object ;
      
      if( is_object( $object ) ) 
          $object = get_object_vars( $object ) ;
      
      return array_map( ’inc_object_to_array’, $object ) ;
  
  /**
  
   * yql -> tableau
  
   * @throws Exception
  
   * @param  string $u
  
   * @return array|bool
  
   */
  
  function inc_yql_to_array($u) 
  
      define(’_YQL_ENDPOINT’, ’http://query.yahooapis.com/v1/public/yql?&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&q=’) ;
  
      $v = recuperer_page($url = _YQL_ENDPOINT.urlencode($u).’&format=json’) ;
  
      $w = json_decode($v) ;
  
      if (!$w) 
  
          throw new Exception(’YQL : r&#233 ;ponse vide ou mal form&#233 ;e’) ;
  
          return false ;
  
      
  
      return inc_object_to_array($w) ;