I try to play sound from a php script to my raspberry pi 3 via the audio jack. I use in the php script the following code:
<?php
$fetch = 'wget "http://192.168.1.127/sound.mp3" -O sound.mp3 --no-check-certificate';
$play = 'omxplayer -o local sound.mp3';
echo shell_exec($fetch);
echo shell_exec("sudo chown upload sound.mp3");
echo shell_exec($play);
?>
I got the file from a local ip adress and save it to the pi. Then I play the sound via the omxplayer command. On the real shell (over SSH in Putty), the Pi will output the sound without any problems. When I try the script, I got the following error message when I use the omxplayer command.
* failed to open vchiq instance
I searched then in forums for this error. They mean that it will be something with the missing permission of the file. For that I set the whole directory to the permission level 777 and the fileowner, as you can see in the script, to upload.
Unfortunately, this didn't work. Does anyone have another solution to get an output from the pi?
Thanks for every responses.
Finally I found a solution for that problem, after I searched again. The problem was with a directory in the /dev. I hit the following command in the command line and it works great.
sudo chmod 777 /dev/vchiq
Don't use the "777" mode on the /dev/vchiq because it's not secure! In general case you just need to add user who really need to use camera to the system group called "video". In example: if you need to allow user "testuser" in the Linux system to use camera just use user modification command:
usermod -G video testuser