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VideoLAN Port VLC to Mobile OS
Jean-Baptiste Kempf
mercredi 14 janvier 2015
VideoLAN Port VLC to Mobile OS Jean-Baptiste Kempf mercredi 14 - - PowerPoint PPT Presentation
VideoLAN Port VLC to Mobile OS Jean-Baptiste Kempf mercredi 14 - - PowerPoint PPT Presentation
VideoLAN Port VLC to Mobile OS Jean-Baptiste Kempf mercredi 14 janvier 2015 Ecole Centrale Paris The Cone VLC 900 000 per day More than 1.5B over VLC lifetime 1 every 6 Mac Top 15 Windows Most used French software VLC VLMC
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Ecole Centrale Paris
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The Cone
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VLC
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1 every 6 Mac Top 15 Windows 900 000 per day More than 1.5B
- ver VLC lifetime
Most used French software
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libVLC libVLCcore VLC VLMC Applications Interface MKV Ogg Mux Demuxer x264 Vorbis Theora Decoder Filters Aout Vout Modules Modules Modules Modules
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What we need to port VLC
➢ Compiler ➢ Libc
➢ Files, Unicode
➢ Threads
➢ + cancellation
➢ Network
➢ BSD sockets
➢ Modules
➢ dlopen
➢ Audio output
➢ Delay computation
➢ Video output
➢ YUV
➢ Interfaces
Requirements
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iOS
➢ Technically, iOS is great :
➢ Same OS than OS X
➢ But
➢ Same bugs about pthread/signal ➢ Static modules only ➢ Multicast
➢ AudioUnit vs AuHal
➢ Stereo only
➢ OpenGL output
➢ Limitation in YUV → RGB shaders
iOS
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Android
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100 % Open Source
➢ 2.1+
Full video player
➢ All codecs, formats, protocols ➢ Hardware and multicore decoding
Full audio player
➢ Media library & Indexing ➢ Audio Background service
VLC for Android
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Technically, Android is bad,
and it's a mess (android-x platforms vs SDK versions)
➢ Shared Modules
➢ limits of .so shared → static like iOS
➢ Bionic is broken ➢ pthread rwlock_t → AOSP android-11 + workarounds ➢ wchar_t functions → AOSP android-14 ➢ off_t 32bits… → #define ➢ multicast → disabled
Port to Android
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Android Multimedia
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Audio
➢ AudioTrack Java
➢ Slow
➢ AudioTrack native
➢ Missing delay computation
➢ OpenSL ES
➢ Buggy
➢ AudioFlinger
➢ Not portable
Port to Android : Audio
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Video
➢ Android 2.1, 2.2
➢ SurfaceFlinger dlopen ➢ Using Android-9 headers ➢ RGB
➢ Android 2.3+
➢ Android NativeWindow ➢ 1 surface only, no rotation ➢ Android NativeWindowPriv ➢ anw.14.so ➢ RGB vs YUV ➢ Opaque
➢ OpenGL ES
➢ Buggy EGL
Port to Android : Video
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Codec
➢ Android 2.3
➢ OMX + Binder = iOMX
➢ Android 3.0+ ➢ iOMX + gralloc ➢ Android 4.1+
➢ MediaCodec Java ➢ Broken
➢ Android 4.3+ ➢ MediaCodec Java
➢ Software and hardware rendering
Port to Android : Codecs
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Project start
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Release in July 2012
➣ Beta on Google Play ➣ Limited countries ➣ ARMv7 only ➣ Numerous crashes ➣ Good feedback ➣ GPLv3
Release
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Video
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Evolution
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Evolution
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Audio v2
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Video v2
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Port to WinRT
➢ Compiler ➢ Libc
➢ New access module, limited
➢ Threads
➢ 50ms wake-up
➢ Network
➢ WinRT sockets
➢ Modules
➢ dlopen limited
➢ Audio output
➢ Xaudio broken for delay
➢ Video output
➢ Direct2D (RGB only)
➢ Interfaces in C#
Requirements
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