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• Streaming engines best practice in C

  20 novembre 2014, par ash

  LANG : C / ENV : Linux

  I am developing a streaming engine, for now I am able to start, stop and pause the stream, but seeking is the operation that’s giving me a lot of headache, I already asked a question here before and fixed some issues inside the code from the answers.

  Using lseek() function, I am passing the open streaming file descriptor as first argument, plus I am using UDP for transmitting, something like the following code :

  transport_fd = open(tsfile, O_RDONLY);
  
  int offset = 1024;
  
  off_t offsetIndicator;
  
  if ((offsetIndicator=lseek(transport_fd, offset, SEEK_CUR))<0) printf("Error seeking\n");

  Whenever I try to seek while streaming, the streaming stops and the pictures hangs.

  Is there anything I should pay attention to ?, i.e : like attempting to sleep() or nanosleep() after seeking into the file in order for the changes to take effect.

  I couldn’t find examples, papers or realted articles for best practices in such engines.

  EDIT :

  After testing, it seems like the file continued to stream but receiving devices on the network didn’t catch the stream connection anymore, and calculating the time it took to finish after subtract seeking time, the stream seems to be finished normally.

  CODE SNIPPET :

  while (!completed) 
  
  {
  
      while (/* Comparing conditions */ && !completed)
  
      { 
  
          if (seekLck == 1) // seekLck is a semaphore to test seek signal from father process initiated by 0
  
          {
  
              int offset = 1024;
  
              off_t offsetIndicator;
  
              if ((offsetIndicator=lseek(transport_fd, offset, SEEK_CUR))<0) 
  
                  printf("Error seeking\n");
  
              nanosleep(&nano_sleep_packet, 0); //Try to sleep to see if it is still hanging, didn't work 
  
              seekLck = 0;
  
          }   
  
          len = read(transport_fd, send_buf, packet_size);
  
          if(len < 0) {
  
              fprintf(stderr, "File read error \n");
  
              completed = 1;
  
          } 
  
          else if (len == 0)
  
          {
  
              fprintf(stderr, "Sent done\n");
  
              completed = 1;
  
          }
  
          else
  
          {
  
              sent = sendto(sockfdstr, send_buf, len, 0, (struct sockaddr *)&addr, sizeof(struct sockaddr_in));
  
              if(sent <= 0)
  
              {
  
                  perror("send(): error ");
  
                  completed = 1;
  
              }
  
          }
  
      }
  
      nanosleep(&nano_sleep_packet, 0);
  
  }
  
  close(transport_fd);
  
  close(sockfdstr);
  
  free(send_buf);
  
  printf("cleaning up\n");
  
  return 0;
  
  }

• Play audio files on a guild channel (Not working on Ubuntu Server)

  18 octobre 2018, par danielperales555

  I want to make a "soundboard" on my Discord Bot.

  The bot is currently running on Ubuntu Server 18.04 in a VPS Hosting.

  I installed ffmpeg via aptitude apt-get install ffmpeg, and the respective node modules on my project via npm : npm install ffmpeg-binaries --save and npm install node-opus --save

  I have this provisional code :

  //Command syntax: !play (sound)
  
  if (!args[0]) return message.channel.send('noCorrectSyntax'); //args is provided by module.run
  
  
  
  let sound = args[0];
  
  let isReady = true;
  
  
  
  if (isReady) {
  
      isReady = false;
  
      let voiceChannel = message.member.voiceChannel;
  
      if (!voiceChannel) return message.channel.send('noChannel');
  
  
  
      voiceChannel.join().then(connection =>{
  
          const dispatcher = connection.playFile(`../resources/audios/${sound}.mp3`);
  
          if (!dispatcher) return message.channel.send('soundNotFound');
  
  
  
          console.log(`Playing ${sound} on ${message.member.voiceChannel.name}`);
  
  
  
          dispatcher.on("end", end => {
  
              voiceChannel.leave();
  
              console.log(`Finished`);
  
          });
  
      }).catch(err => console.log(err));
  
      isReady = true;
  
  } else {
  
      return message.channel.send('botNotAvailable');
  
  }

  When my bot joins the voice room, it leaves instantly without playing the sound.

  Am I doing something wrong by installing the ffmpeg codec this way ? Is a problem with the VPS ?

  (I tried with a new bot, installing ffmpeg on windows and setting the environment variable path and it worked fine)

  EDIT :

  I listened for the "error" and "debug" events on the StreamDispatcher (as specified in https://discord.js.org/#/docs/main/stable/class/StreamDispatcher?scrollTo=e-error), but I don’t receive errors or debug info.

  When I listen for the "speaking" event, is showed on my console as false

• Strange enum name clash

  29 avril 2015, par TheSHEEEP

  I am compiling a project that uses both ffmpeg and Ogre.
  Now on Windows, everything works fine.

  But when I want to compile a file with the following line of code :

  Ogre::PixelFormat format = Ogre::PF_BYTE_RGBA;

  The compiler gives the following error :

  error: ‘AVPixelFormat’ is not a member of ‘Ogre’

  Which is strange in many ways, as I have not only specified the Ogre namespace with : :, but also there is no AVPixelFormat in Ogre. How does gcc confuse "PixelFormat" with "AVPixelFormat" ?

  And how can I get rid of that ?

  I’d love to use int here instead of an enum, but another Ogre function requires format to be in Ogre::PixelFormat.