FFMPEG Pnacl Port

This is a webport of the FFMPeg library into Pnacl. It's inspired from http://neo.idletime.tokyo/enu/ffmpeg_pnacl/.

Features

• FFmpeg pexe file
• LibAv libraries (decode/encode)
• Support of H264, (Optional: H265, VPX)

Aim

This port has been made to decode encoded H264 video frames in real-time within/for the OSH Toolkit (https://github.com/opensensorhub/osh-js). The OSH-js toolkit already a ported version of FFMpeg using emscripten but for FULL HD stream (and more) it was too slow. This project is intended to get real-time video with low lantecy using hardware acceleration within your web browser.

Requirements

• Clone this git directory
• Install and setup the Pnacl Toolkit (https://developer.chrome.com/native-client/sdk/download)

Installation

Export your PNacl SDK env variable

$ export NACL_SDK_ROOT=<SDK_PATH>/nacl_sdk/pepper_56
$ export PATH=$NACL_SDK_ROOT/toolchain/linux_pnacl/bin:$PATH

Build x264

Go to the "pnacl-ffmpeg-3.0.1" directory

$ cd pnacl-ffmpeg-3.0.1/x264-snapshot-20160103-2245-stable/
$ ./naclconfig
$ make
$ make install

The config file has been setup to install directly into your NACL_SDK_ROOT directory

Build FFMPeg

$ cd ..
$ cd ffmpeg-3.0.1/
$ ./naclconfig
$ make
$ make install

The config file has been setup to install directly into your NACL_SDK_ROOT directory

Now you have install the x264, ffmpeg and libAv libraries into your Pnacl SDK. You can use your SDK by including these libraries.

Example

The OSH example connects to a local OSH server to get a H264 stream and decode it using libav libs.

Go to the example:

$ cd ../..
$ cd cd pnacl-ffmpeg-example/

At this point, you have a first Makefile allowing you to serve a local server by using:

$ make serve

It will provide you a http local url to test the App.

If you want to modify the C++ code, you have to go to the osh integration directory:

$ cd osh-integration-example/
$ make

It will generate a new pexe file (compressed).

The ffmpeg_decoder.cc file is the one you have to modify.

Like the other config files, the Makefile uses the $(NACL_SDK_ROOT) env variable.

Misc

Here the FFMPeg compile options:

./configure \
    --target-os=linux \
    --arch=pnacl \
    --disable-runtime-cpudetect \
    --prefix="$NACL_SDK_ROOT/toolchain/linux_pnacl/le32-nacl/usr" \
    --cross-prefix=pnacl- \
    --cc=pnacl-clang \
    --ld=pnacl-clang++ \
    --pkg_config=pkg-config \
    --enable-gpl \
    --enable-static \
    --disable-shared \
    --enable-incompatible-libav-abi \
    --enable-cross-compile \
    --disable-ffplay \
    --enable-ffprobe \
    --disable-ffserver \
    --disable-asm \
    --disable-inline-asm \
    --disable-indevs \
    --disable-protocols \
    --disable-network \
    --disable-protocol=file \
    --disable-demuxer=rtsp \
    --disable-demuxer=image2 \
    --disable-doc \
    --disable-htmlpages \
    --disable-manpages \
    --disable-podpages \
    --disable-txtpages \
    --disable-network \
    --extra-libs='-lppapi_simple -lppapi -lppapi_cpp -lnacl_io' \
    --enable-libx264 \
    --disable-libx265 \
    --disable-libvpx \
    --enable-avformat \
    --enable-avdevice \
    --enable-avfilter \
    --enable-swresample \
    --enable-pthreads \
    --enable-avcodec \
	--enable-avutil \
	--enable-decoder=h264