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• ffmpeg main() function in android studio

  21 avril 2016, par Spartan

  Here I am trying to use ffmpeg with gradle experimental plugin.

  This is how I included all my shared libraries and their headers in repositories

  repositories {
  
      libs(PrebuiltLibraries) {
  
          libavdevice {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libavdevice-57.so")
  
              }
  
          }
  
  
  
          libavcodec {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libavcodec-57.so")
  
              }
  
          }
  
  
  
          libavutil {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libavutil-55.so")
  
              }
  
          }
  
  
  
          libavformat {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libavformat-57.so")
  
              }
  
          }
  
  
  
          libswscale {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libswscale-4.so")
  
              }
  
          }
  
  
  
          libswresample {
  
              headers.srcDir "/home/spartan/AndroidStudioProjects/Hello/app/src/main/jni/include"
  
              binaries.withType(SharedLibraryBinary) {
  
                  sharedLibraryFile = file("/home/spartan/AndroidStudioProjects/Hello/app/src/main/jniLibs/${targetPlatform.getName()}/libswresample-2.so")
  
              }
  
          }
  
  
  
  
  
  
  
      }
  
  }
  
  
  
  android.ndk {    
  
          moduleName = "video_trim"
  
          ldLibs.addAll(["log", "android","jnigraphics"])
  
      }
  
  
  
  
  
      android.sources {
  
          main {
  
              jni {
  
                  dependencies {
  
                     library "libavdevice" linkage "shared"
  
                     library "libavcodec" linkage "shared"
  
                     library "libavutil" linkage "shared"
  
                     library "libavformat" linkage "shared"
  
                     library "libswscale" linkage "shared"
  
                     library "libswresample" linkage "shared" 
  
  
  
                  }
  
              }
  
          }
  
      }

  I tested one ffmpeg function(without using main function) which is running successfully. So this configuration seems ok.

  No I want to use ffmpeg.c’smain() function to use cmd for that I manually copy pasted ffmpeg.c,cmdutils.c, cmdutils.h, ffmpeg_filter.c, ffmpeg_opt.c,ffmpeg.h in my jni folder along with video_trim.c.( I took refrence from halfninja ).

  Here I am not using Andoid.mk so instead of LOCAL_C_INCLUDES, tried like this(updated android.ndk) to include ffmpeg folder(cppFlags was not working so I used CFlags also) :

  android.ndk {  
  
          moduleName = "video_trim"
  
  
  
          cppFlags.add("-I/home/spartan/ndk/android-ndk-r11c/sources/ffmpeg-3.0.1")
  
          CFlags.add("-I/home/spartan/ndk/android-ndk-r11c/sources/ffmpeg-3.0.1")
  
  
  
          ldLibs.addAll(["log", "android","jnigraphics"])
  
      }

  But I am getting lot of undefined reference to error.
  Ex :

  /home/spartan/AndroidStudioProjects/Hello/app/src/main/none/cmdutils.c
  
  Error:(1086) undefined reference to 'avfilter_version'
  
  Error:(1086) undefined reference to 'avfilter_configuration'
  
  Error:(1621) undefined reference to 'avfilter_pad_get_type'
  
  Error:(1618) undefined reference to 'avfilter_pad_get_name'
  
  Error:(1610) undefined reference to 'avfilter_next'
  
  Error:(1815) undefined reference to 'avfilter_get_by_name'
  
  Error:(1834) undefined reference to 'avfilter_pad_count'

• avutil/random_seed : Add the runtime in cycles of the main loop to the entropy pool

  9 décembre 2015, par Michael Niedermayer

  avutil/random_seed : Add the runtime in cycles of the main loop to the entropy pool
  This should theoretically improve the randomness slightly
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/random_seed.c

• AAC encoder : encode out-of-phase I/S efficiently

  10 janvier 2016, par Claudio Freire

  AAC encoder : encode out-of-phase I/S efficiently
  Use the ability to invert phase with ms_mask instead of changing
  
  the codebook when possible, to avoid having to switch codebooks
  
  if some bands are INTENSTY_BT and others are INTENSITY_BT2, since
  
  usually a set ms_mask uses less bits that a codebook change. While
  
  it may not always be a win (ie : if it causes an ms_mask bitmap
  
  to be sent when it wouldn’t have been otherwise), it’s unlikely
  
  since the ms_mask bitmap will almost always be there already for
  
  M/S itself.
  

  • [DH] libavcodec/aacenc_is.c