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• intrax8 : Use local destination buffers

  20 février 2016, par Vittorio Giovara

  intrax8 : Use local destination buffers
  These buffers are just a way to store frame pointers and be able to
  
  modify them without touching the original ones.
  The two dependent decoders (WMV2 and VC1) do not need special care for
  
  these fields : the former does not seem to use the dest buffers, while
  
  the latter reinits them every time to the current frame data buffers.
  So only keep a local copy rather than the one from mpegvideo.
  

  • [DBH] libavcodec/intrax8.c
  • [DBH] libavcodec/intrax8.h

• Algorithm to draw waveform from audio

  25 septembre 2024, par yayuj

  I'm trying to draw a waveform from a raw audio file. I demuxed/decoded an audio file using FFmpeg and I have those informations : samples buffer, the size of the samples buffer, the duration of the audio file (in seconds), sample rate (44100, 48000, etc), sample size, sample format (uint8, int16, int32, float, double), and the raw audio data itself.

  



  Digging on the Internet I found this algorithm (more here) :

  



  White Noise :

  



  

  



  The Algorithm

  



  


  All you need to do is randomize every sample from –amplitude to
 amplitude. We don’t care about the number of channels in most cases so
 we just fill every sample with a new random number.

  


  



  Random rnd = new Random();
short randomValue = 0;

for (int i = 0; i < numSamples; i++)
{
    randomValue = Convert.ToInt16(rnd.Next(-amplitude, amplitude));
    data.shortArray[i] = randomValue;
}


  



  It's really good but I don't want to draw that way, but this way :

  



  

  



  Is there any algorithm or idea of how I can be drawing using the informations that I have ?

  


• MAINTAINERS : Add Haihao Xiang for vaapi

  14 décembre 2021, par U. Artie Eoff

  MAINTAINERS : Add Haihao Xiang for vaapi
  Current listed maintainers for vaapi plugin are
  
  not reponsive and/or currently active in the
  
  ffmpeg community.  Thus, vaapi plugin patches
  
  (and qsv plugin) have generally gone ignored or
  
  lost in the ether for too long.
  Remove Gwenole Beauchesne from vaapi maintainer
  
  who has not been active since 2016.
  Current alternative maintainer for vaapi is Mark
  
  Thompson whom has not been active since
  
  March/April 2021.
  Therefore, add Haihao Xiang to vaapi maintainer
  
  who's primary role is FFmpeg development with a
  
  focus on the vaapi and qsv plugins.  Haihao has
  
  over a decade of media experience and many years
  
  of FFmpeg development experience, amongst other
  
  media frameworks.
  The additional patch for adding Haihao as qsv
  
  plugin maintainer has been submitted previously :
  https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210608141134.27448-1-zhongli_dev@126.com/
  This will help FFmpeg to continue to be the leading
  
  multimedia framework by allowing these plugins to be
  
  actively improved, enhanced, and maintained for existing
  
  and future HW platforms.
  Signed-off-by : U. Artie Eoff <ullysses.a.eoff@intel.com>
  

  • [DH] MAINTAINERS