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Also, when specifically specifying a mixer using the -m flag, the device (USB Audio) is locked exclusively. If another application wants to use the device I get errors.
Now, I have no desire to let multiple applications play music at the same time, but when I switch to playing music from the iPad using ShairPlay I don’t want to manully go in via SSH and launch the appropriate process.
OK, so that makes it possible to use USB Audio, Excellent.
using .asoundrc to set the USB card as the default still doesn’t work without jittering (other audio software on the same systems needs .asoundrc), but that is OK for now. Added bonus with being able to specify the device on the command line is that (I assume) you can run multiple instances, each sending output to a different device.When the -m option is used it shows quite a few mixers, they can’t all be used as that results in errors, which makes it a bit tricky to find the correct number to use. One of my RPis has 2 USB audio cards and I can play through 1 of the USB devices without jittering, but the other USB Audio card jitters very bad. Also if a .asoundrc is present with a different default card then I cannot play through one of the USB cards at all).
Details below.
Kitchen-Pi (Standard Raspbian with 1 external USB Audio)
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java -jar soundseederspeaker_v0.4.1b.jar -m 3
SoundSeeder Speaker
Version 0.4.1 beta – built50117
Copyright 2015 JekApps – http://www.soundseeder.comAvailable mixers:
[0]ALSA [default], version 3.12.35+
[1]ALSA [plughw:0,0], version 3.12.35+
[2]ALSA [plughw:0,1], version 3.12.35+
[3]Device [plughw:1,0], version 3.12.35+
[4]Port ALSA [hw:0], version 3.12.35+
[5]Port Device [hw:1], version 3.12.35+
Selected mixer: 3
Device [plughw:1,0], version 3.12.35+
Supported source line types:
interface SourceDataLine supporting 8 audio formats, and buffers of at least 32 bytes
interface Clip supporting 8 audio formats, and buffers of at least 32 bytesLivingRoom-Pi (Standard Raspbian with 2 external USB Audio)
===========================================================
[0]ALSA [default], version 3.12.35+
[1]Device_1 [plughw:0,0], version 3.12.35+
[2]Device [plughw:1,0], version 3.12.35+
[3]ALSA [plughw:2,0], version 3.12.35+
[4]ALSA [plughw:2,1], version 3.12.35+
[5]Port Device_1 [hw:0], version 3.12.35+
[6]Port Device [hw:1], version 3.12.35+
[7]Port ALSA [hw:2], version 3.12.35+With .asoundrc set to “defaults.pcm.card 2”
– Works: 0 (onboard), 2 (USB1), 3 (onboard), 4 (onboard)
– Error: 1, 5, 6, 7With no .asoundrc
– Jittering: 0 (USB2)
– Works: 2 (USB1), 3 (onboard), 4 (onboard)
– Error: 1, 5, 6, 7‘Error’ means the following:
Exception in thread “SpeakerPlaybackThread” java.lang.IllegalArgumentException: Line unsupported: interface SourceDataLine supporting format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian
at com.sun.media.sound.DirectAudioDevice.getLine(DirectAudioDevice.java:174)
at com.soundseeder.speaker.g.run(Unknown Source)So, great progress, but would like to be able to play through the second USB card as well
No, it uses the USB Audio Standard, which is supported out of the box by Raspbian
“aplay -l” shows the following in addition to the standard bcm28355 audio output
card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0You can use the fee I paid for the app, with spare change :-), to purchase the USB Audio card at http://www.ebay.co.uk/itm/121476075685?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Alternatively I’d be happy to test / debug things for you. I am using the latest version of Raspbian (on a model B+) with default Alsa settings other than a .asoundrc file that contains the following line to make the USB Audio card the default.
defaults.pcm.card 1
Your Card ID may differ, a quick aplay -l will tell the exact ID used by the Audio Device.
