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• aarch64 : Use ret x instead of br x where possible

  28 septembre 2020, par Jonathan Wright

  aarch64 : Use ret x<n> instead of br x<n> where possible
  Change AArch64 assembly code to use :
  
    ret     x<n>
  
  instead of :
  
    br      x<n>
  "ret x<n>" is already used in a lot of places so this patch makes it
  
  consistent across the code base. This does not change behavior or
  
  performance.
  In addition, this change reduces the number of landing pads needed in
  
  a subsequent patch to support the Armv8.5-A Branch Target
  
  Identification (BTI) security feature.
  Signed-off-by : Jonathan Wright <jonathan.wright@arm.com>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/simple_idct_neon.S
  • [DH] libavcodec/aarch64/vp9itxfm_16bpp_neon.S
  • [DH] libavcodec/aarch64/vp9itxfm_neon.S
  • [DH] libavcodec/aarch64/vp9lpf_16bpp_neon.S
  • [DH] libavcodec/aarch64/vp9lpf_neon.S

• Javascript sync images

  26 septembre 2021, par Ruan Matt

  I'm studying about FPS, animations, image processing in order to get into the game development world.

  


  I took a video and extract each frame into a .jpg image, and I want to run these images, side by side, in the same sync as the original video

  


  You can test at this link => https://jsfiddle.net/ruanmatt144/267erymL/2/

  


  The problem : The video FPS is 30, but even if I put 1000/30, or any other value that refers to the original FPS, it doesn't work ! It doesn't stay in sync. setTimeout has a limit on decimal places that I don't know about ?

  


  Video timestamp for each frame => https://unity-animation.ztech.gq/timestamp.txt

  


  How can I sync those images following the original video timestamp ? Thank you.

  


  var arr = Array();
var v = 0;
var v2 = 0;
var k = 0;

(function getImages(i) {
  setTimeout(function() {
    v++;
    var r = Math.random();
        loadImage("https://unity-animation.ztech.gq/frames/out-" + v + ".jpg?v=" + r);
        arr.push("https://unity-animation.ztech.gq/frames/out-" + v + ".jpg?v=" + r);

        if (--i) getImages(i);
  }, 30)
})(20000);



const loadImage = src =>
    new Promise((resolve, reject) => {
        const img = new Image();
        img.onload = () => resolve(img);
        img.src = src;
    })  
;

var imgArray = new Array();
setTimeout(function() {
    (function runVideo(i) {
        setTimeout(function() {
            v2++;
            imgArray[v2] = new Image();
            document.getElementById('load').appendChild(imgArray[v2]);

            imgArray[v2].src = arr[v2];
            imgArray[v2].classList.add("overlayImage");
            imgArray.shift();
            var parent = document.querySelector("#load");
            [...parent.children].slice(0,-10).forEach(parent.removeChild.bind(parent));
            var last = document.querySelector('#load img:last-child').getAttribute("src");
            var _final = last.substring(
                last.indexOf("-") + 1, 
                last.lastIndexOf(".jpg")
            );
            arr.shift();
        if (--i) runVideo(i);
      }, 90) // <== the problem is here, which value I must use?
    })(38194);
    document.getElementById("video").play();
}, 20000);


  


• FFMPEG : Can not free AVPacket when decode H264 stream ?

  13 janvier 2016, par TTGroup

  I’m using FFMPEG to decode H264 stream, my code is below

  AVFormatContext *pFormatCtx = NULL;
  
  AVCodecContext  *pCodecCtx = NULL;
  
  AVFrame         *pFrame = NULL;
  
  AVPacket        packet;
  
  packet.data = NULL;
  
  
  
  pFormatCtx = avformat_alloc_context();  
  
  avformat_open_input(&pFormatCtx, videoStreamPath, NULL, NULL);
  
  liveHeader.pCodecCtx = pFormatCtx->streams[videoStreamIndex]->codec;
  
  
  
  int  bytesDecoded = 0;
  
  int  frameFinished = 0;
  
  while (true)
  
  {
  
      while (packet.size > 0)
  
      {
  
          // Decode the next chunk of data
  
          bytesDecoded = avcodec_decode_video2(pCodecCtx, pFrame,
  
              &frameFinished, &packet);
  
  
  
          // Was there an error?
  
          if (bytesDecoded < 0)
  
          {
  
              printf(strErr, "Error while decoding frame\n");
  
              commonGlobal->WriteRuntimeRecLogs(strErr);
  
              return RS_NOT_OK;
  
          }
  
  
  
          packet.size -= bytesDecoded;
  
          packet.data += bytesDecoded;
  
          if (frameFinished)
  
          {               
  
              //av_free_packet(&packet); //(free 1)
  
              return RS_OK;
  
          }
  
          // Did we finish the current frame? Then we can return
  
      }
  
      do
  
      {
  
          try
  
          {
  
              int ret = av_read_frame(pFormatCtx, &packet);
  
              if (ret < 0)
  
              {
  
                  char strErr[STR_LENGTH_256];
  
                  if (ret == AVERROR_EOF || (pFormatCtx->pb && pFormatCtx->pb->eof_reached))
  
                  {
  
                      sprintf(strErr, "Error end of file line %d", __LINE__);
  
                  }
  
                  if (pFormatCtx->pb && pFormatCtx->pb->error)
  
                  {
  
                      sprintf(strErr, "Error end of file line %d", __LINE__);
  
                  }
  
                  packet.data = NULL;
  
                  return RS_NOT_OK;
  
              }
  
          }
  
          catch (...)
  
          {
  
              packet.data = NULL;
  
              return RS_NOT_OK;
  
          }
  
      } while (packet.stream_index != videoStreamIndex);
  
  }
  
  
  
  //av_free_packet(&packet); //(free 2)

  The problem is I don’t know how to free memory of packet correctly.

  I have tried to delete packet’s data by calling one of two places av_free_packet(&packet); (free 1) and av_free_packet(&packet); (free 2). And the result is the application was crashed with the message "Heap Corruption..."

  If I do not free the packet, the memory leak is occur.

  Note that the above code is successful when decode H264 stream, the main problem is memory leak and crashed when I try to free the packet

  Someone can show me the problems in my code.

  Many thanks,

  T&T