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• Updating SDL yuv Texture

  15 juin 2015, par madprogrammer2015

  I am receiving an H.264 video stream and successfully decoding it with FFMPEG. It can display the first frame of data but then after that the screen never updates. It just appears to become a static image. I am using YUV pixel format, and I am receiving it in that format as well. Also I am using SDL_UpdateYUVTexture().

  Here is my code :

  int main()
  
  {
  
      WORD wVersionRequested;
  
      WSADATA wsaData;
  
      int wsaerr;
  
  
  
      if (SDL_Init(SDL_INIT_EVERYTHING)) {
  
          fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
  
          exit(1);
  
      }
  
  
  
      // Using MAKEWORD macro, Winsock version request 2.2
  
      wVersionRequested = MAKEWORD(2, 2);
  
  
  
      wsaerr = WSAStartup(wVersionRequested, &wsaData);
  
  
  
      if (wsaerr != 0)
  
      {
  
          /* Tell the user that we could not find a usable */
  
          /* WinSock DLL.*/
  
          printf("The Winsock dll not found!\n");
  
          return 0;
  
      }
  
      else
  
      {
  
          printf("The Winsock dll found!\n");
  
          printf("The status: %s.\n", wsaData.szSystemStatus);
  
      }
  
  
  
      /* Confirm that the WinSock DLL supports 2.2.*/
  
      /* Note that if the DLL supports versions greater    */
  
      /* than 2.2 in addition to 2.2, it will still return */
  
      /* 2.2 in wVersion since that is the version we      */
  
      /* requested.                                        */
  
      if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
  
      {
  
          /* Tell the user that we could not find a usable */
  
          /* WinSock DLL.*/
  
          printf("The dll do not support the Winsock version %u.%u!\n", LOBYTE(wsaData.wVersion), HIBYTE(wsaData.wVersion));
  
          WSACleanup();
  
          return 0;
  
      }
  
      else
  
      {
  
          printf("The dll supports the Winsock version %u.%u!\n", LOBYTE(wsaData.wVersion), HIBYTE(wsaData.wVersion));
  
          printf("The highest version this dll can support: %u.%u\n", LOBYTE(wsaData.wHighVersion), HIBYTE(wsaData.wHighVersion));
  
      }
  
  
  
      ULONG              localif;
  
      /*INT Ret;
  
      HANDLE ThreadHandle;
  
      DWORD ThreadId;
  
      WSAEVENT AcceptEvent;
  
      char               buf[1024];
  
      int                buflen = 1024, rc, err;*/
  
  
  
      SOCKET s;
  
      SOCKET ns;
  
      SOCKADDR_IN        multi, safrom;
  
      int fromlen;
  
  
  
      int totalSize = 0;
  
  
  
      AVCodec *codec;
  
      AVCodecContext *codecContext;
  
      int frame;
  
      int got_picture;
  
      AVFrame *picture;
  
      AVPacket packet;
  
      SwsContext* convertContext;
  
      uint16_t i = 1;
  
      //std::queue<madproto> queue;
  
      //std::list<madproto> list;
  
      AVCodecParserContext *parser;
  
      std::vector buffer;
  
      //moodycamel::ConcurrentQueue<madproto> protoQueue;
  
  
  
      SDL_Window *window;
  
      SDL_Renderer *renderer;
  
      SDL_Texture *bmp;
  
      SDL_Rect rect;
  
  
  
      file.open("log.txt");
  
  
  
      s = socket(AF_INET, SOCK_STREAM, IPPROTO_RM);
  
  
  
      multi.sin_family = AF_INET;
  
      multi.sin_port = htons(5150);
  
      multi.sin_addr.s_addr = inet_addr("234.5.6.7");
  
      int bindResult = bind(s, (PSOCKADDR)&amp;multi, sizeof(multi));
  
  
  
      if (bindResult &lt; 0)
  
      {
  
          std::cout &lt;&lt; "bindResult: " &lt;&lt; WSAGetLastError() &lt;&lt; std::endl;
  
      }
  
  
  
      listen(s, 10);
  
  
  
      //if ((AcceptEvent = WSACreateEvent()) == WSA_INVALID_EVENT)
  
      //{
  
      //  printf("WSACreateEvent() failed with error %d\n", WSAGetLastError());
  
      //  return 1;
  
      //}
  
      //else
  
      //  printf("WSACreateEvent() is OK!\n");
  
  
  
      //// Create a worker thread to service completed I/O requests
  
      //if ((ThreadHandle = CreateThread(NULL, 0, WorkerThread, (LPVOID)AcceptEvent, 0, &amp;ThreadId)) == NULL)
  
      //{
  
      //  printf("CreateThread() failed with error %d\n", GetLastError());
  
      //  return 1;
  
      //}
  
      //else
  
      //  printf("CreateThread() should be fine!\n");
  
  
  
      localif = inet_addr("192.168.1.2");
  
      setsockopt(s, IPPROTO_RM, RM_ADD_RECEIVE_IF, (char *)&amp;localif, sizeof(localif));
  
  
  
      fromlen = sizeof(safrom);
  
      ns = accept(s, (SOCKADDR *)&amp;safrom, &amp;fromlen);
  
  
  
      closesocket(s);  // Don't need to listen anymore
  
  
  
      std::string received;
  
  
  
      av_register_all();
  
  
  
      int horizontal = 0;
  
      int vertical = 0;
  
  
  
      GetDesktopResolution(horizontal, vertical);
  
  
  
      codec = avcodec_find_decoder(CODEC_ID_H264);
  
      if (!codec) {
  
          std::cout &lt;&lt; "codec not found" &lt;&lt; std::endl;
  
          std::cin.get();
  
      }
  
  
  
      codecContext = avcodec_alloc_context3(codec);
  
  
  
      /*if (codec->capabilities &amp; CODEC_CAP_TRUNCATED)
  
          codecContext->flags |= CODEC_FLAG_TRUNCATED;*/
  
  
  
      //codecContext->flags |= CODEC_FLAG_LOW_DELAY;
  
      codecContext->flags2 |= CODEC_FLAG2_CHUNKS;
  
  
  
      codecContext->width = horizontal;
  
      codecContext->height = vertical;
  
      codecContext->codec_id = CODEC_ID_H264;
  
      codecContext->codec_type = AVMEDIA_TYPE_VIDEO;
  
      codecContext->pix_fmt = PIX_FMT_YUV420P;
  
      codecContext->thread_type = 0;
  
  
  
      if (avcodec_open2(codecContext, codec, NULL) &lt; 0) {
  
          std::cout &lt;&lt; "could not open codec" &lt;&lt; std::endl;
  
          std::cin.get();
  
      }
  
  
  
      convertContext = sws_getContext(
  
          codecContext->width,
  
          codecContext->height,
  
          PIX_FMT_RGB32,
  
          codecContext->width,
  
          codecContext->height,
  
          PIX_FMT_YUV420P,
  
          SWS_BICUBIC,
  
          NULL,
  
          NULL,
  
          NULL
  
          );
  
  
  
      parser = av_parser_init(CODEC_ID_H264);
  
  
  
      picture = av_frame_alloc();
  
  
  
      if (ns == INVALID_SOCKET)
  
      {
  
          std::cout &lt;&lt; "accept didn't work!" &lt;&lt; std::endl;
  
          std::cin.get();
  
      }
  
  
  
      /*if (WSASetEvent(AcceptEvent) == FALSE)
  
      {
  
          printf("WSASetEvent() failed with error %d\n", WSAGetLastError());
  
          return 1;
  
      }
  
      else
  
          printf("WSASetEvent() should be working!\n");*/
  
  
  
      window = SDL_CreateWindow("YUV", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, codecContext->width, codecContext->height, SDL_WINDOW_SHOWN);
  
      renderer = SDL_CreateRenderer(window, -1, 0);
  
      bmp = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, codecContext->width, codecContext->height);
  
  
  
      //receive = SDL_CreateThread(receiveThread, "ReceiveThread", (void *)NULL);
  
      bool quit = false;
  
  
  
      rect.x = 0;
  
      rect.y = 0;
  
      rect.w = codecContext->width;
  
      rect.h = codecContext->height;
  
  
  
      while (!quit)
  
      {
  
          while (true)
  
          {
  
              MadProto proto;
  
              int result = recvfrom(ns, (char *)&amp;proto, sizeof(MadProto), 0, (struct sockaddr *)&amp;multi, &amp;fromlen);
  
  
  
              if (result &lt; 0)
  
              {
  
                  std::cout &lt;&lt; "receive failed! error: " &lt;&lt; WSAGetLastError() &lt;&lt; std::endl;
  
                  break;
  
              }
  
              else
  
              {
  
                  std::cout &lt;&lt; "receive successful, received " &lt;&lt; result &lt;&lt; " bytes" &lt;&lt; std::endl;
  
  
  
                  if (ntohs(proto.frame_end) == 1)
  
                  {
  
                      uint8_t *outbuffer = NULL;
  
                      int outBufSize = 0;
  
                      int rc = av_parser_parse2(parser, codecContext, &amp;outbuffer, &amp;outBufSize, buffer.data(), buffer.size(), 0, 0, 0);
  
  
  
                      if (outBufSize &lt;= 0)
  
                      {
  
                          std::cout &lt;&lt; "parsing failed!" &lt;&lt; std::endl;
  
                          std::cout &lt;&lt; "outBufSize: " &lt;&lt; outBufSize &lt;&lt; std::endl;
  
                          break;
  
                      }
  
  
  
                      if (rc)
  
                      {
  
                          std::cout &lt;&lt; "rc: " &lt;&lt; rc &lt;&lt; std::endl;
  
                          std::cout &lt;&lt; "parsing successful!" &lt;&lt; std::endl;
  
                          //std::cin.get();
  
  
  
                          av_init_packet(&amp;packet);
  
                          packet.size = outBufSize;
  
                          packet.data = outbuffer;
  
  
  
                          frame = avcodec_decode_video2(codecContext, picture, &amp;got_picture, &amp;packet);
  
  
  
                          if (frame &lt; 0)
  
                          {
  
                              std::cout &lt;&lt; "decoding was unsuccessful!" &lt;&lt; std::endl;
  
                              break;
  
                          }
  
  
  
                          if (got_picture)
  
                          {
  
                              std::cout &lt;&lt; "decoding was successful!" &lt;&lt; std::endl;
  
                              std::cout &lt;&lt; "decoded length was: " &lt;&lt; frame &lt;&lt; std::endl;
  
                              buffer.empty();
  
  
  
                              //std::cin.get();
  
                              int code = SDL_UpdateYUVTexture(bmp, NULL, picture->data[0], picture->linesize[0],
  
                                  picture->data[1], picture->linesize[1],
  
                                  picture->data[2], picture->linesize[2]);
  
  
  
                              if (code &lt; 0)
  
                              {
  
                                  std::cout &lt;&lt; "unable to update texture " &lt;&lt; SDL_GetError() &lt;&lt; std::endl;
  
                                  std::cin.get();
  
                              }
  
  
  
                              code = SDL_RenderClear(renderer);
  
  
  
                              if (code &lt; 0)
  
                              {
  
                                  std::cout &lt;&lt; "renderer clear failed " &lt;&lt; SDL_GetError() &lt;&lt; std::endl;
  
                                  std::cin.get();
  
                              }
  
  
  
                              code = SDL_RenderCopy(renderer, bmp, NULL, &amp;rect);
  
  
  
                              if (code &lt; 0)
  
                              {
  
                                  std::cout &lt;&lt; "renderer copy failed " &lt;&lt; SDL_GetError() &lt;&lt; std::endl;
  
                                  std::cin.get();
  
                              }
  
  
  
                              SDL_RenderPresent(renderer);
  
  
  
                              SDL_Delay(40);
  
                          }
  
  
  
                          av_free_packet(&amp;packet);
  
                      }
  
                  }
  
                  else
  
                  {
  
                      std::copy(proto.payload, proto.payload + ntohs(proto.nal_length), std::back_inserter(buffer));
  
                      std::cout &lt;&lt; "frame is continuing!" &lt;&lt; std::endl;
  
  
  
                      //queue.push(proto);
  
                      //list.push_front(proto);
  
                  }
  
              }
  
          }
  
  
  
          SDL_WaitEvent(&amp;event);
  
          switch (event.type)
  
          {
  
          case SDL_QUIT:
  
              quit = true;
  
              break;
  
          }
  
      }
  
  
  
      std::cout &lt;&lt; "closing everything!" &lt;&lt; std::endl;
  
      av_frame_free(&amp;picture);
  
      closesocket(ns);
  
      fclose(f);
  
      std::cin.get();
  
      return 0;
  
  }
  
  </madproto></madproto></madproto>

• Data Privacy Day 2020

  27 janvier 2020, par Matthieu Aubry — Privacy
  It’s January 28th which means it’s Data Privacy Day !

  Today is an important day for the Matomo team as we reflect on our mission and our goals for 2020. This year I wanted to send a video message to all Matomo users, community members and customers. 

  Check it out (full transcript below)

  

  A video message from Matomo founder, Matthieu Aubry

  Privacy-friendly alternatives

  • NoMoreGoogle :
    a comprehensive list giving you options for other privacy-friendly alternatives.
  • Switching.Software :
    Ethical alternatives to popular sites and apps.
  • Web browser :
    Firefox
    Brave
    Vivaldi
  • Search engine :
    DuckDuckGo
    Qwant
  • File sharing :
    Nextcloud
  • Email provider :
    ProtonMail
    Mailfence
    Tutanota

  Video transcript

  Hey everyone,

  Matthieu here, Founder of Matomo.

  Today is one of the most significant days of the year for the Matomo team – it’s Data Privacy Day. And so I wanted to quickly reflect on our mission and the significance of this day. 

  In today’s busy online world where data is king, this day is an important reminder of being vigilant in protecting our personal information online.

  Matomo began 12 years ago as an open-source alternative to Google Analytics – the goal was, and still is to give full control of data back to users. 

  In 2020, we are determined to see through this commitment. We will keep building a powerful and ethical web analytics platform that focuses on privacy protection, data ownership, and provides value to all Matomo users and customers.

  And what’s fantastic is to see the rise of other quality software companies offering privacy-friendly alternatives for web browsers, search engines, file sharing, email providers, all with a similar mission. And with these products now widely available, we encourage you to take back control of all your online activities and begin this new decade with a resolution to stay safe online.

  I’ll provide you with some links below the video to check out these privacy-friendly alternatives. If you have a website and want to gain valuable insights on the visitors while owning your data, join us ! 

  Matomo Analytics On-Premise is and always will be free to download and install on your own servers and on your own terms.

  Also feel free to join our active community or spread the word to your friends and network about the importance of data privacy.

  Thank you all and wishing you a great 2020 !

  For more information on how Matomo protects the privacy of your users, visit : https://matomo.org/privacy/

  Do you have privacy concerns ?

  What better day than today to speak up ! What privacy concerns have you experienced ?

  Contact Support

• Nexus One

  19 mars 2010, par Mans — Uncategorized

  I have had a Nexus One for about a week (thanks Google), and naturally I have an opinion or two about it.
  

  Hardware

  With the front side dominated by a touch-screen and a lone, round button, the Nexus One appearance is similar to that of most contemporary smartphones. The reverse sports a 5 megapixel camera with LED flash, a Google logo, and a smaller HTC logo. Power button, volume control, and headphone and micro-USB sockets are found along the edges. It is with appreciation I note the lack of a front-facing camera ; the silly idea of video calls is finally put to rest.

  Powering up the phone (I’m beginning to question the applicability of that word), I am immediately enamoured with the display. At 800×480 pixels, the AMOLED display is crystal-clear and easily viewable even in bright light. In a darker environment, the display automatically dims. The display does have one quirk in that the subpixel pattern doesn’t actually have a full RGB triplet for each pixel. The close-up photo below shows the pattern seen when displaying a solid white colour.

  

  The result of this is that fine vertical lines, particularly red or blue ones, look a bit jagged. Most of the time this is not much of a problem, and I find it an acceptable compromise for the higher effective resolution it provides.

  Basic interaction

  The Android system is by now familiar, and the Nexus offers no surprises in basic usage. All the usual applications come pre-installed : browser, email, calendar, contacts, maps, and even voice calls. Many of the applications integrate with a Google account, which is nice. Calendar entries, map placemarks, etc. are automatically shared between desktop and mobile. Gone is the need for the bug-ridden custom synchronisation software with which mobile phones of the past were plagued.

  Launching applications is mostly speedy, and recently used apps are kept loaded as long as memory needs allow. Although this garbage-collection-style of application management, where you are never quite sure whether an app is still running, takes a few moments of acclimatisation, it works reasonably well in day to day use. Most of the applications are well-behaved and save their data before terminating.

  Email

  Two email applications are included out of the box : one generic and one Gmail-only. As I do not use Gmail, I cannot comment on this application. The generic email client supports IMAP, but is rather limited in functionality. Fortunately, a much-enhanced version, K-9, is available for download. The main feature I find lacking here is threaded message view.

  The features, or lack thereof, in the email applications is not, however, of huge importance, as composing email, or any longer piece of text, is something one rather avoids on a system like this. The on-screen keyboard, while falling among the better of its kind, is still slow to use. Lack of tactile feedback means accidentally tapping the wrong key is easily done, and entering numbers or punctuation is an outright chore.

  Browser

  Whatever the Nexus lacks in email abilities, it makes up for with the browser. Surfing the web on a phone has never been this pleasant. Page rendering is quick, and zooming is fast and simple. Even pages not designed for mobile viewing are easy to read with smart reformatting almost entirely eliminating the sideways scrolling which hampered many a mobile browser of old.

  Calls and messaging

  Being a phone, the Nexus One is obviously able to make and receive calls, and it does so with ease. Entering a number or locating a stored contact are both straight-forward operations. During a call, audio is clear and of adequate loudness, although I have yet to use the phone in really noisy surroundings.

  The other traditional task of a mobile phone, messaging, is also well-supported. There isn’t really much to say about this.

  Multimedia

  Having a bit of an interest in most things multimedia, I obviously tested the capabilities of the Nexus by throwing some assorted samples at it, revealing ample space for improvement. With video limited to H.264 and MPEG4, and the only supported audio codecs being AAC, MP3, Vorbis, and AMR, there are many files which will not play.

  To make matters worse, only selected combinations of audio and video will play together. Several video files I tested played without sound, yet when presented with the very same audio data alone, it was correctly decoded. As for container formats, it appears restricted to MP4/MOV, and Ogg (for Vorbis). AVI files are recognised as media files, but I was unable to find an AVI file which would play.

  With a device clearly capable of so much more, the poor multimedia support is nothing short of embarrassing.

  The Market

  Much of the hype surrounding Android revolves around the Market, Google’s virtual marketplace for app authors to sell or give away their creations. The thousands of available applications are broadly categorised, and a search function is available.

  The categorised lists are divided into free and paid sections, while search results, disappointingly, are not. To aid the decision, ratings and comments are displayed alongside the summary and screenshots of each application. Overall, the process of finding and installing an application is mostly painless. While it could certainly be improved, it could also have been much worse.

  The applications themselves are, as hinted above, beyond numerous. Sadly, quality does not quite match up to quantity. The vast majority of the apps are pointless, though occasionally mildly amusing, gimmicks of no practical value. The really good ones, and they do exist, are very hard to find unless one knows precisely what to look for.

  Battery

  Packing great performance into a pocket-size device comes with a price in battery life. The battery in the Nexus lasts considerably shorter time than that in my older, less feature-packed Nokia phone. To some extent this is probably a result of me actually using it a lot more, yet the end result is the same : more frequent recharging. I should probably get used to the idea of recharging the phone every other night.

  Verdict

  The Nexus One is a capable hardware platform running an OS with plenty of potential. The applications are still somewhat lacking (or very hard to find), although the basic features work reasonably well. Hopefully future Android updates will see more and better core applications integrated, and I imagine that over time, I will find third-party apps to solve my problems in a way I like. I am not putting this phone on the shelf just yet.