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SRS for linux-arm

How to run SRS on ARM pcu?

• Application on ARM to publish stream to SRS, use srs-librtmp.
• Run SRS on ARM: Client can play stream from ARM server.

Why run SRS on ARM?

The use scenario:

• There are lots of ARM device, and the center server cannot accept so many streams.
• User can directly play stream on ARM when ARM running SRS server.
• SRS can output RTMP and HLS, for both PC and mobile(Android+IOS).

Ubuntu Cross Build SRS

Cross build ST and OpenSSL on Ubuntu16.

CrossBuild SRS in Ubuntu16

Use docker，Ubuntu 16(xenial)：

docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:ubuntu16

Build SRS in docker：

cd ~/git && docker run -it -v `pwd`:/tmp/git -w /tmp/git/srs/trunk \
    registry.cn-hangzhou.aliyuncs.com/ossrs/srs:ubuntu16 bash

Install toolchain, for example Acqua or RoadRunner board

apt-get install -y gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf

Cross build SRS:

./configure --arm --cc=arm-linux-gnueabihf-gcc --cxx=arm-linux-gnueabihf-g++ \
    --ar=arm-linux-gnueabihf-ar --ld=arm-linux-gnueabihf-ld --randlib=arm-linux-gnueabihf-randlib &&
make

Run SRS on ARM board

Run SRS on ARMv7 docker:

docker pull armv7/armhf-ubuntu &&
cd ~/git && docker run -it -v `pwd`:/tmp/git -w /tmp/git/srs/trunk \
    -p 1935:1935 -p 1985:1985 -p 8080:8080 armv7/armhf-ubuntu \
    ./objs/srs -c conf/console.conf

Publish stream:

ffmpeg -re -i doc/source.200kbps.768x320.flv -c copy \
    -f flv -y rtmp://127.0.0.1:1935/live/livestream

Play stream：http://ossrs.net/srs.release/trunk/research/players/srs_player.html?app=live&stream=livestream&server=localhost&port=1935&autostart=true&vhost=localhost

Use Other Cross build tools

SRS configure options for cross build:

root@4c618f90fc4c:/tmp/git/srs/trunk# ./configure -h
Toolchain options:          @see https://github.com/ossrs/srs/issues/1547#issuecomment-576078411
  --arm                     Enable crossbuild for ARM.
  --mips                    Enable crossbuild for MIPS.
  --cc=<CC>                 Use c compiler CC, default is gcc.
  --cxx=<CXX>               Use c++ compiler CXX, default is g++.
  --ar=<AR>                 Use archive tool AR, default is ar.
  --ld=<LD>                 Use linker tool LD, default is ld.
  --randlib=<RANDLIB>       Use randlib tool RANDLIB, default is randlib.
  --extra-flags=<EFLAGS>    Set EFLAGS as CFLAGS and CXXFLAGS. Also passed to ST as EXTRA_CFLAGS.

RaspberryPi

We can directly build and run SRS on RespberryPI, without crossbuild.

Armel and Armhf

The error Illegal instruction is the cpu not compatible, the cross build target cpu too high, read http://stackoverflow.com/questions/14253626/arm-cross-compiling

The bellow is a simple test program:

/*
 arm-linux-gnueabi-g++ -o test test.cpp -static
 arm-linux-gnueabi-strip test
*/
#include <stdio.h>

int main(int argc, char** argv) {
    printf("hello, arm!\n");
    return 0;
}

To get the target cpu:

arm-linux-gnueabi-readelf --file-header --arch-specific test
Result:
  Machine:                           ARM
File Attributes
  Tag_CPU_name: "7-A"
  Tag_CPU_arch: v7

So, the ubuntu12 cross build target cpu is cpuv7(debian armhf).

The debian armel, cpu is armv5:

root@debian-armel:~# cat /proc/cpuinfo 
Processor	: ARM926EJ-S rev 5 (v5l)
CPU revision	: 5

While the debian armhf, cpu is armv7:

root@debian-armhf:~# cat /proc/cpuinfo 
Processor	: ARMv7 Processor rev 0 (v7l)
CPU architecture: 7

Run test program on armhf:

root@debian-armhf:~# ./test 
hello, arm!

Winlin 2014.11