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• Seeking Guidance on Audio Development Libraries for Playing Various Music Formats on iOS [closed]

  3 décembre 2023, par FaiChou

  I am exploring audio development and am overwhelmed by the numerous libraries available :

  


  

  • AVFoundation

  


  • MediaPlayer

  


  • AVFAudio

  


  • Audio Engine

  


  • CoreAudio

  


  • AudioToolbox

  


  • Audio Unit

  


  


  Which of these should I use to play both network or local music files (flac/wav/mp3/aac/wma/ogg) ? What are their specific roles ?

  


  My understanding is that I should use ffmpeg for demuxing to unpackage, then decode the stream to get PCM samples, possibly using Audio Engine for playback. Is this a software decoding method ? For Apple-supported formats like mp3, can I bypass ffmpeg for decoding ? Which library would be most suitable in this case ?

  


  Additionally, how do I extract metadata (song name, artist, cover, lyrics, etc.) from music files ? Apple's own solutions seem to support only ID3 or iTunes tags. How should I handle other formats like wav/flac ?

  


  The two links below are the resources I've referenced, but they seem outdated. My search for newer, reliable explanations has been fruitless.

  


  

  • whats-the-difference-between-the-apple-audio-frameworks

  


  • Core Audio Essentials

  


  


• Piwik 3 Development Update #2 – Git master branch will become Piwik 3

  2 septembre 2016, par Piwik Core Team — Community, Development

  As mentioned in the Piwik 3 Development Update #1 we are actively working on the new major Piwik 3 release.

  This blog post is an announcement regarding an upcoming change on our Git repository.

  On October 4th CET, we will merge the current changes done for Piwik 3 from the “3.x-dev” branch into the “master“ branch across our Piwik projects and plugin repositories. While this is not important for most of our users, it can be a problem if you have installed and deployed Piwik from git.

  • If you are currently on “master” branch and want to continue using Piwik 2, you need to checkout the newly created “2.x-dev” branch instead of “master” anytime within the next 4 weeks. Don’t forget to update your scripts and scheduled tasks (cronjobs) that may reference “master” branch.
  • If you want to receive an early version of Piwik 3 via git automatically, you won’t have to change anything.

  The final Piwik 3 release will be ready before the end of the year. If you want to give it a try, you can either use Piwik from Git and check out the “3.x-dev” branch, or download Piwik 3 from GitHub.

  Until our next Piwik 3 dev update, Happy analysis !

• How can I develop a 264 "codec format worked in VideoView API on android ?

  31 juillet 2018, par lscodex

  I have got a big problem. I have a video "tc10.264" I downloaded from live555.com. I can not play the video that using videoview,exoplayer and vitamio sdk
  on android.
  I know that the video is codec.it is not container like mp4,flv etc.
  Later, I played the video with "ffplay -f h264 tc10.264 " via on windows console.
  and ffmpeg shows me this spec.
  h264(baseline), yubj420p and 25 fps.

  Okay this video is exist.
  After, I downloaded ffmpeg from on ubuntu in virtual machine. And I build(compile) the ffmpeg with x264 it as shown below.

  my directory path is like ffmpeg > x264 and I compiled libx264.a for ffmpeg from x264 folder.

  Note : my android phone has architecturally armeabi_v7a

  There is build_android_arm.sh script.

  #!/bin/bash
  
  echo starting building .... 
  
  NDK=/home/lscodex/android-sdk/ndk-bundle
  
  PLATFORM=$NDK/platforms/android-19/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  PREFIX=./android/arm
  
  
  
  function build_one
  
  {
  
    ./configure \
  
    --prefix=$PREFIX \
  
    --enable-static \
  
    --enable-pic \
  
    --host=arm-linux \
  
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
    --sysroot=$PLATFORM
  
  
  
    make clean
  
    make
  
    make install
  
  }
  
  
  
  build_one
  
  
  
  echo Android ARM builds finished....

  After, I have a folder called android containing lib,include and bin files.So, I compiled script that shown below to achieve shared folder (".so") in ffmpeg folder.
  there is build_android_armeabi_v7a.sh script

  #!/bin/bash
  
  
  
  echo Android starting armeabi_v7a
  
  NDK=/home/lscodex/android-sdk/ndk-bundle
  
  PLATFORM=$NDK/platforms/android-19/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  CPU=armeabi_v7a
  
  PREFIX=$(pwd)/android/$CPU
  
  
  
  GENERAL="\
  
  --enable-small \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc" \
  
  --arch=arm \
  
  --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
  --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
  --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
  --extra-cflags="-I../x264/android/arm/include" \
  
  --extra-ldflags="-L../x264/android/arm/lib" "
  
  
  
  
  
  MODULES="\
  
  --enable-gpl \
  
  --enable-libx264"
  
  
  
  H264TEST="\
  
  --enable-encoder=libx264 \
  
  --enable-encoder=libx264rgb \
  
  --enable-decoder=h264 \
  
  --enable-muxer=h264 \
  
  --enable-demuxer=h264 \
  
  --enable-parser=h264"
  
  
  
  function build_ARMv7
  
  {
  
    ./configure \
  
    --target-os=android \
  
    --prefix=$PREFIX \
  
    ${GENERAL} \
  
    --sysroot=$PLATFORM \
  
    --enable-shared \
  
    ${H264TEST} \
  
    --disable-static \
  
    --extra-cflags="-march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fomit-frame-pointer -fstrict-aliasing -funswitch-loops -finline-limit=300" \
  
    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
    --enable-zlib \
  
    ${MODULES} \
  
    --disable-doc \
  
    --enable-neon
  
  
  
    make clean
  
    make
  
    make install
  
  }
  
  
  
  
  
  build_ARMv7
  
  echo Android ARMv7-a builds finished

  finally, I obtained another an android folder that contain shared library.
  I integrated the files from the android studio. I created CMakeLists.txt and cpp folder.
  So, Everything is perfectly working, I think.
  this ndk code helping me for receive a duration of bugs_bunny.mp4 video.

  extern "C"
  
  JNIEXPORT jint JNICALL
  
  Java_com_lscodex_just_videoplayertesting2_VideoProcessing_videoDuration(
  
          JNIEnv *env,
  
          jobject obj,
  
          jstring input) {
  
  
  
  
  
      AVFormatContext *pFormatCtx = NULL;
  
  
  
       if(avformat_open_input(&pFormatCtx,convertStringFileToChar(env,input),NULL,NULL)<0){
  
           throwException(env,"Could not open input file ");
  
           loge("Could not open input file ");
  
           return 0;
  
       }
  
       if (avformat_find_stream_info(pFormatCtx,NULL)<0){
  
           throwException(env,"Failed to retrieve input stream information");
  
           loge("Failed to retrieve input stream information");
  
           return 0;
  
       }
  
  
  
      logd("I reached it here :) ");
  
  
  
  
  
      int64_t duration = pFormatCtx->duration;
  
      avformat_close_input(&pFormatCtx);
  
      avformat_free_context(pFormatCtx);
  
      return (jint) (duration / AV_TIME_BASE);
  
  }

  at least for mp4 video format.
  So, my question is, How can I run tc10.264 codec video format via ffmpeg on exoplayer or on videoview api ?