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• armv6 : Accelerate ff_fft_calc for general case (nbits != 4)

  16 juillet 2014, par Ben Avison

  armv6 : Accelerate ff_fft_calc for general case (nbits != 4)
  The previous implementation targeted DTS Coherent Acoustics, which only
  
  requires nbits == 4 (fft16()). This case was (and still is) linked directly
  
  rather than being indirected through ff_fft_calc_vfp(), but now the full
  
  range from radix-4 up to radix-65536 is available. This benefits other codecs
  
  such as AAC and AC3.
  The implementaion is based upon the C version, with each routine larger than
  
  radix-16 calling a hierarchy of smaller FFT functions, then performing a
  
  post-processing pass. This pass benefits a lot from loop unrolling to
  
  counter the long pipelines in the VFP. A relaxed calling standard also
  
  reduces the overhead of the call hierarchy, and avoiding the excessive
  
  inlining performed by GCC probably helps with I-cache utilisation too.
  I benchmarked the result by measuring the number of gperftools samples that
  
  hit anywhere in the AAC decoder (starting from aac_decode_frame()) or
  
  specifically in the FFT routines (fft4() to fft512() and pass()) for the
  
  same sample AAC stream :
                Before          After
  
                Mean   StdDev   Mean   StdDev  Confidence  Change
  
  Audio decode  2245.5 53.1     1599.6 43.8    100.0%      +40.4%
  
  FFT routines  940.6  22.0     348.1  20.8    100.0%      +170.2%
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/arm/fft_init_arm.c
  • [DBH] libavcodec/arm/fft_vfp.S

• Evolution #4256 : Faire un signalement des mise à jour de sécu

  11 janvier 2019

  Si on pouvait éviter de coder un truc spécifique encore, ça serait bien :)

  Mais sinon, composer.json n’a aucun numéro de version pour le paquet lui-même (à part pour la déclaration des dépendances). C’est le gestionnaire de version qui les gère (les tags en Git par exemple). https://github.com/drush-ops/drush/issues/2947 indique chez Drush https://github.com/drush-ops/drush/pull/3087 qui se base sur un fichier .json de déclaration (pour vérifier des paquets composer). En l’occurrence https://raw.githubusercontent.com/drupal-composer/drupal-security-advisories/8.x/composer.json

• integrate ffmpeg with spring boot

  13 juin 2024, par Parkash Sbd

  I have a react native app much like social media app.Users upload their photos and videos from that app .While uploading I wanna show processing sign with percent and I have RESTful api endpoints written in spring boot and wanna resize media(photos and videos).Is there any easy way to implement it.I have heard of ffmpeg but I don't know how to integrate it with spring boot.
Thanks.