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• Memory leaks while doing memcpy

  27 octobre 2013, par Zoellick

  I'm trying to write an utility dealing with ffmpeg. Once i need to copy image plane from one pointer to another. From AVPicture structure to my own.
  Here is some sources.

  My own frame structe. Memory allocated in constructor, deallocated in destructor

  template <class>
  
  struct Frame
  
  {
  
      DataType* data; //!&lt; Pointer to image data
  
      int f_type; //!&lt; Type of color space (ex. RGB, HSV, YUV)
  
      int timestamp; //!&lt; Like ID of frame. Time of this frame in the video file
  
      int height; //!&lt; Height of frame
  
      int width; //!&lt; Width of frame
  
  
  
      Frame(int _height, int _width, int _f_type=0):
  
          height(_height),width(_width),f_type(_f_type)
  
      {
  
          data = new DataType[_width*_height*3];
  
      }
  
  
  
      ~Frame()
  
      {
  
          delete[] data;
  
      }
  
  };
  
  </class>

  Here is the main loop performing conversion. If the line with memcpy is commented, there are no memory leaks at all. But if I uncomment it, the memory leak are present.

  for(int i = begin; i < end; i++)
  
  {
  
      AVPicture pict;
  
      avpicture_alloc(&pict, PIX_FMT_BGR24, _width, _height);
  
      std::shared_ptr> frame(new Frame<char>(_height, _width, (int)PIX_FMT_BGR24));
  
  
  
      sws_scale(ctx, frame_list[i]->data, frame_list[i]->linesize, 0, frame_list[i]->height, pict.data, pict.linesize);
  
  
  
      memcpy(frame->data,pict.data[0],_width*_height*3);
  
  
  
      //temp_to_add->push_back(std::shared_ptr>(frame));
  
  
  
      avpicture_free(&amp;pict);
  
  }
  
  </char>

  I've been trying lot of things such as : allocating memory via malloc and deallocating via free, copying memory from pict to frame by hands (in for loop), using std::copy and avpicture_layout that is ffmpeg helper function. Nothing helps.
  So the question : do I forget about something important ?

  I will be grateful for every answer.

• Linker error with ffmpeg

  2 octobre 2013, par Martin Delille

  I'm trying to build a really simple Qt program using FFMpeg library.

  Currently I just want to open and close a video file.

  Here is my project file :

  QT    += core gui
  
  TARGET = avtest01
  
  TEMPLATE = app
  
  INCLUDEPATH += /usr/local/include
  
  LIBS += -L/usr/local/lib -lavformat
  
  SOURCES += main.cpp

  And my code :

  #include <qdebug>
  
  
  
  extern "C" {
  
  #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      if(argc > 1)
  
      {
  
          AVFormatContext *format_context;
  
          qDebug() &lt;&lt; argv[1];
  
          if(avformat_open_input(&amp;format_context, argv[1], NULL, NULL) == 0)
  
          {
  
              qDebug() &lt;&lt; "open";
  
              avformat_close_input(&amp;format_context);
  
          }
  
          else
  
              qDebug() &lt;&lt; "error opening " &lt;&lt; argv[1];
  
      }    
  
      return 0;
  
  }
  
  </qdebug>

  Unfortunately, the linker fails :

  Undefined symbols for architecture x86_64:
  
    "avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)", referenced from:
  
      _main in main.o
  
    "avformat_close_input(AVFormatContext**)", referenced from:
  
      _main in main.o

  I'm using Qt 5.1.0 on MacOS.

• x86 : hpeldsp : Move avg_pixels8_x2_mmx() out of hpeldsp_rnd_template.c

  23 avril 2013, par Diego Biurrun

  x86 : hpeldsp : Move avg_pixels8_x2_mmx() out of hpeldsp_rnd_template.c
  The function is only instantiated once, so there is no point
  
  in keeping it in a template file.
  

  • [DBH] libavcodec/x86/Makefile
  • [DBH] libavcodec/x86/dsputil_mmx.h
  • [DBH] libavcodec/x86/hpeldsp_init.c
  • [DBH] libavcodec/x86/hpeldsp_mmx.c
  • [DBH] libavcodec/x86/hpeldsp_rnd_template.c