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• lavc/aarch64/fdct : add neon-optimized fdct for aarch64

  17 avril 2024, par Ramiro Polla

  lavc/aarch64/fdct : add neon-optimized fdct for aarch64
  The code is imported from libjpeg-turbo-3.0.1. The neon registers used
  
  have been changed to avoid modifying v8-v15.
  Reviewed-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/Makefile
  • [DH] libavcodec/aarch64/fdct.h
  • [DH] libavcodec/aarch64/fdctdsp_init_aarch64.c
  • [DH] libavcodec/aarch64/fdctdsp_neon.S
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/fdctdsp.c
  • [DH] libavcodec/fdctdsp.h
  • [DH] libavcodec/options_table.h
  • [DH] libavcodec/tests/aarch64/dct.c

• avcodec/executor : remove unused ready callback

  24 septembre 2024, par Nuo Mi

  avcodec/executor : remove unused ready callback
  Due to the nature of multithreading, using a "ready check" mechanism may introduce a deadlock. For example :
  Suppose all tasks have been submitted to the executor, and the last thread checks the entire list and finds
  
  no ready tasks. It then goes to sleep, waiting for a new task. However, for some multithreading-related reason,
  
  a task becomes ready after the check. Since no other thread is aware of this and no new tasks are being added to
  
  the executor, a deadlock occurs.
  In VVC, this function is unnecessary because we use a scoreboard. All tasks submitted to the executor are ready tasks.
  

  • [DH] libavcodec/executor.c
  • [DH] libavcodec/executor.h
  • [DH] libavcodec/vvc/thread.c

• RTSP streaming on Android client using FFMpeg

  7 février 2021, par rurtle

  I am working on a hobby project the goal for which is to develop an Android application capable of streaming live feeds captured through web cams in a LAN setting using FFMpeg as the underlying engine. So far, I did the following -

  



  A. Compiling and generating FFMpeg related libraries for the following releases -

  



  FFMpeg version : 2.0
  
NDK version : r8e & r9
  
Android Platform version : android-16 & android-18thisthisthisthis
  
Toolchain version : 4.6 & 4.8
  
Platform built on : Fedora 18 (x86_64)
  

  



  B. Creating the files Android.mk & Application.mk in appropriate path.

  



  However, when it came to writing the native code for accessing appropriate functionality of FFMpeg from the application layer using Java, I'm stuck with following questions -

  



  a) Which all of FFMpeg's features I need to make available from native to app layer for streaming real-time feeds ?
  
b) In order to compile FFMpeg for Android, I followed this link. Whether the compilation options are sufficient for handling *.sdp streams or do I need to modify it ?
  
c) Do I need to make use of live555 ?
  

  



  I am totally new to FFMpeg and Android application development and this is going to be my first serious project for Android platform. I have been searching for relevant tutorials dealing with RTSP streaming using FFMpeg for a while now without much success. Moreover, I tried the latest development build of VLC player and found it to be great for streaming real-time feeds. However, it's a complex beast and the goal for my project is of quite limited nature, mostly learning - in a short time span.

  



  Could you suggest some pointers (e.g. links, documents or sample code) on how can I write the native code for utilizing FFMpeg library and subsequently use those functionality from the app layer for streaming real-time feeds ? Moreover, will really appreciate if you could let me know the kind of background knowledge necessary for this project from a functional standpoint (in a language agnostic sense).