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Introduction

Pipewire is a server and user space API to deal with multimedia pipelines.This page dedicated to bringing up and validation of multiple sample application with pipewire in RPI-3 B+ target. 

Get the list of captured encoded data file(pipewirexxxyyy.h264) from /tmp directory and play it in VLC player.

Build and Flash Procedure

RDK-C rdk-next Yocto 3.1 dunfell build for Raspberrypi

Validation Steps

STEP 1:

Add require SSID and PSK in /etc/wpa_supplicant.conf file in below format

network={

ssid="username"

psk="password"

}

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
update_config=1

network={
ssid="XXX"
psk="YYYYY"
}

STEP 2:

Reboot the Target

After Reboot don't do step 1 and 2.

Note : Step 1 & 2 is only applicable for fresh target boot-up with new image.

STEP 3:

WiFi connection is must needed for this validation to copy the encoded data file(pipewire.h264) to local PC.

Check WiFi connection by using below command.

ifconfig

root@raspberrypi3-rdk-camera:~# ifconfig
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:87 errors:0 dropped:0 overruns:0 frame:0
          TX packets:87 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4552 (4.4 KiB)  TX bytes:4552 (4.4 KiB)

wlan0     Link encap:Ethernet  HWaddr B8:27:EB:2E:72:2B  
          inet addr:192.168.43.246  Bcast:192.168.43.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:23 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2893 (2.8 KiB)  TX bytes:5887 (5.7 KiB)

STEP 4:

Before validate this use case we should stop rms binary and mediastreamer binary with below command.

systemctl stop rms-launcher

systemctl stop mst-launcher

STEP 5:

Use the below command to export PATH variable

export PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/libexec/installed-tests/pipewire-0.3/examples

root@raspberrypi3-rdk-camera:~# export PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/libexec/installed-tests/pipewire-0.3/examples

STEP 6:

Before trigger the pipewire binaries, We need to enable "repeat_sequence_header" in v4l2 driver to validate multiple sample application.

root@raspberrypi3-rdk-camera:~# v4l2-ctl --set-ctrl=repeat_sequence_header=1 

STEP 7:

Run the pipewire binary with below command

pipewire &

root@raspberrypi3-rdk-camera:~# pipewire & 

STEP 8:

Run the pipewire media session binary with below command

pipewire-media-session &

root@raspberrypi3-rdk-camera:~# pipewire-media-session &

STEP 9:

Run the sample application binary with below command.

If you want to validate multiple application then run this binaries at multiple time.

For example : If you want to validate three application then run this binary at three times and then buffer file will be store in /tmp directory with date and time.

pw-capture

root@raspberrypi3-rdk-camera:~# pw-capture &

STEP 9:

Get encoded data available file from local /tmp directory.

root@raspberrypi0-rdk-camera:~# cd /tmp/
root@raspberrypi0-rdk-camera:/tmp# ls pipewire*

STEP 9:

Copy encoded data available file from your RPI /tmp directory into your local PC and play it in VLC player.

xxxxxx@yyyyy-Lenovo-B480:~/XXXXX$ scp root@RPI_DEVICE_WIFI_IP:/tmp/pipewire.h264 .

Example:
xxxxxx@yyyyy-Lenovo-B480:~/XXXXX$ scp root@192.168.43.246:/tmp/pipewire.h264* .
pipewire-h264                                                                           100%   16KB  16.4KB/s   00:00    
xxxxxx@yyyyy-Lenovo-B480:~/XXXXX$ 

https://reolink.com/how-to-play-h264-files-in-vlc/

Play the pipewire.h264 file in VLC player.