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SRS for linux-arm

How to run SRS on ARM pcu?

• Run SRS on ARM: Client can play stream from ARM server.

Why run SRS on ARM?

The use scenario:

• Run SRS on ARM server, see #1282.
• Crossbuild for ARM embeded device, see #1547.

Ubuntu Cross Build SRS

Cross build ST and OpenSSL on Ubuntu16.

CrossBuild SRS in Ubuntu16

Build SRS in docker(Ubuntu 16(xenial))：

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

Install toolchain(optional), for example Acqua or RoadRunner board

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

Cross build SRS:

./configure --cross-build --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:

cd ~/git/srs/trunk && docker run --rm -it -v `pwd`:/srs -w /srs \
    -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
  --cross-build             Enable crossbuild for ARM/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.

Armv8 and Aarch64

For armv8 or aarch64, user can specify the arch, see #1282:

./configure --extra-flags='-D__aarch64__' && make

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