JackAudio January 2018

jackaudio@lists.linuxaudio.org

22 participants
18 discussions

Re: [Jack-Devel] AES67 / SMPTE ST 2110-30

by happy musicmaker

That is such good news. What(low cost) hardware would this development be used on to support the developers with testing/debugging and maybe even development ? * MOTU LP32 (Preferred) * MiniDSP https://www.minidsp.com/products/network-audio/avb-dg (I think MOTU's switch uses midDSP switch hardware) I hope someday it will be possible to connect 4 or more 8 channel ADAT modules (32 channels) to a PC under Ubuntu via AVB with low latency. The only option to get this done under Windows is a Focursrite DANTE based Rednet 3 right now because Thunderbolt is not really available there as well. Plan to get Rednet3, but that does not solve the Linux environment which I prefer. Would love to be able to use the Rednet 3 under Linux but since DANTE is proprietary , so unlikely. My two wishes: [a] Multi (16+) channel low latency audio I/O using ADAT audio AD/DA [b[ Bitwig supporting LV2 plugins. With those two, the Linux Audio environment would be perfect and the world a better place. *(Apology for the re-sends and ignore the previous edits. Web based Gmail is such a annoyance and un-logically structured)*

6 years, 3 months

[Jack-Devel] Capture problems with jack2 on Axia-Alsa device

by Christian Affolter

Hi everyone, capturing from ALSA capture devices via the Jack2 sound server (1.9.12), results in too high pitched wav files (they are playing "too fast" and sound like the "chipmunks"). If I run the same capture directly from the ALSA devices (without Jack involved), everything sounds as expected without any problems. Audio examples: Capture via jackrec: https://filebin.ca/3pyMxBw8cexQ/test-jackrec.wav Capture via arecord: https://filebin.ca/3pyOPjcKGym5/test-arecord.wav The device in question is a "virtual" Axia-ALSA (Livewire+) audio device on CentOS 7 which operates at a sample rate of 48kHz and a bit depth of either 16 or 32. As far as I can see, the sample rate and format detection on the Jack side looks correct. I'm therefore looking for some guidance on how to further debug this, I most certainly missed something obvious. I've also tried to play an mp3 file via mpg123 over jack (without the involvement of the Alsa device) and record it again with jackrec. This works and sounds correct. Here is what I've tried and what the environment looks like: # Capabilities of the Axia-ALSA device arecord -D hw:0 --dump-hw-params Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono HW Params of device "hw:0": -------------------- ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE S32_LE SUBFORMAT: STD SAMPLE_BITS: [16 32] FRAME_BITS: [16 256] CHANNELS: [1 8] RATE: 48000 PERIOD_TIME: (41 1365334) PERIOD_SIZE: [2 65536] PERIOD_BYTES: [64 131072] PERIODS: [1 1024] BUFFER_TIME: (41 1365334) BUFFER_SIZE: [2 65536] BUFFER_BYTES: [64 131072] TICK_TIME: ALL -------------------- arecord: set_params:1299: Sample format non available Available formats: - S16_LE - S32_LE # Capture via arecord directly from the ALSA device (without jackd) # This works as expected and the WAV file sounds fine arecord -D hw:0 -c 2 -d 10 -r 48000 -f S32_LE -v /tmp/test-arecord.wav Recording WAVE '/tmp/test-arecord.wav' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo Hardware PCM card 0 'Axia' device 0 subdevice 0 Its setup is: stream : CAPTURE access : RW_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 16384 period_size : 4096 period_time : 85333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 4096 period_event : 0 start_threshold : 1 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 appl_ptr : 0 hw_ptr : 0 # playing arecord wav (via my local notebook's HDA Intel PCH # device), sounds correct aplay test-arecord.wav Playing WAVE 'test-arecord.wav' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo # Starting jackd # Verbose output at: https://pastebin.com/YzHEGSnR jackd -d alsa -d hw:0 jackdmp 1.9.12 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2016 Grame. Copyright 2016-2017 Filipe Coelho. jackdmp comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details no message buffer overruns no message buffer overruns no message buffer overruns JACK server starting in realtime mode with priority 20 self-connect-mode is "Don't restrict self connect requests" audio_reservation_init Acquire audio card Audio0 creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 32bit integer little-endian ALSA: use 2 periods for playback # Capture via jackrec # This results in a too high pitched WAV file # Verbose output at: https://pastebin.com/PCnymKLA jackrec -f /tmp/test-jackrec.wav -d 10 -b 32 system:capture_1 system:capture_2 # playing jackrec wav (via my local notebook's HDA Intel PCH # device), sounds incorrect aplay test-jackrec.wav Playing WAVE 'test-jackrec.wav' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo System environment: Distribution: CentOS 7.4.1708 Kernel: 3.10.0-693.17.1.el7.x86_64 ALSA Utils: 1.1.3 Jackd: 1.9.12 The jackd was rebuilt from Fedora source RPM to be able to test with the latest version: https://build.opensuse.org/package/show/home:radiorabe:audio/jack-audio-con… Many thanks and best regards Chris

6 years, 9 months

Re: [Jack-Devel] ?==?utf-8?q? Usage feasibility Q

by Ralf Mattes

Sorry, posted with wrong sender ... Am Mittwoch, 31. Januar 2018 17:25 CET, "Ralf Mattes" <r.mattes(a)mh-freiburg.de> schrieb: > > Am Mittwoch, 31. Januar 2018 17:07 CET, Robert Bielik <Robert.Bielik(a)dirac.com> schrieb: > > [...] > > jackd 578 pi 3u REG 0,16 12 11510 /dev/shm/jack_sem.1000_default_system (deleted) > > jackd 578 pi 4u CHR 116,0 0t0 11412 /dev/snd/controlC0 > > jackd 578 pi 5u unix 0xb78a4380 0t0 8031 /dev/shm/jack_default_1000_0 type=STREAM > > jackd 578 pi 6u CHR 116,16 0t0 11413 /dev/snd/pcmC0D0p > > jackd 578 pi 7u CHR 116,24 0t0 11414 /dev/snd/pcmC0D0c > > jackd 578 pi 8u unix 0xb78a7b80 0t0 8033 type=STREAM> jackd 578 pi 9u REG 0,16 12 8034 /dev/shm/jack_sem.1000_default_freewheel (deleted) > > jackd 578 pi 10u unix 0xb78a7800 0t0 11511 /dev/shm/jack_default_1000_0 type=STREAM > > /home/pi/start_jack > > Interesting to see the DEL for file descriptor. > > Well, that means that "someone" removed those files from the filesystem. Since the jackd process still > hase the file descriptors open the files are still there, but since the have no name anymore they are > inaccessible ... > Now you only have to find out _who_ did it ;-.) > > > Cheers, RalfD > >

6 years, 9 months

Re: [Jack-Devel] Usage feasibility Q

by Chris Caudle

On Wed, January 31, 2018 9:03 am, Robert Bielik wrote: > Ok ð although this is jack2 built *without* dbus and running on a > headless RPi3. How does the rc.local start jackd under the user account? Maybe it could start a screen session at that point, and when you ssh in you can connect to the screen session. If you are not familiar with screen it is an application that (among other features) will let you disconnect an ssh session while the underlying terminal session continues to run (usually breaking the ssh session will kill the terminal session associated with that login). When you connect again with ssh you start screen with the -r argument to restore connection to the already running screen session rather than starting a new session. -- Chris Caudle

6 years, 9 months

Re: [Jack-Devel] Usage feasibility Q

by Chris Caudle

On Wed, January 31, 2018 9:30 am, Robert Bielik wrote: > As shown here (I wrote that msg in the forum): "You have been notified about this topic, please login to view it." I don't really feel like going through the effort of creating a new account on some web site I've never heard of to fix your problem. If you would like help on this mailing list then I recommend you send relevant information to this mailing list. > The files in /dev/shm aren't supposed to vanish during > lifetime of jackd process, right ? Not typically. I found this in common/JackShmMem.cpp: jack_log("JackShmMem::delete size = %ld index = %ld", size, info.index); So it seems like at least some shared memory operations get logged. Maybe try -v for verbose logging. -- Chris Caudle

6 years, 9 months

[Jack-Devel] Usage feasibility Q

by Robert Bielik

Hi all, New to JACK wrt actual usage, I'm having a project which I want to setup as follows: 1. JACK in (hw:0,0) -> "JACK mixer" (This one should be as low a latency as possible, preferably 48 frames @48 Khz, i.e. 1ms buffer size) 2. Any-app-using-ALSA -> ALSA JACK plugin -> JACK "mixer" 3. JACK "mixer" -> JACK DSP plugin -> JACK out (hw:0,0) This will, in this particular case, run on a RPi3. Design goals are: One low latency route between input and output on a I2S sound card (1. above) and the rest of the applications using ALSA should share a higher latency route. The output of the JACK "mixer" should pass a JACK plugin before reaching hw:0,0. Before I get my hands too dirty I'd just like to ask if this architecture is feasible to do ? Regards /Robert

6 years, 9 months

Re: [Jack-Devel] ?==?utf-8?q? Usage feasibility Q

by Ralf Mattes

Am Mittwoch, 31. Januar 2018 16:03 CET, Robert Bielik <Robert.Bielik(a)dirac.com> schrieb: > > >> Socket is associated with the desktop session? > > > > > > Ah, seems like a very reasonable explanation. Although I'm not nearly > > > linux-savvy enough to "fix" this, so I'd appreciate pointers �� > > > > I'm just regurgitating buzzwords connected to "dbus". Maybe they help > > trigger the memory of someone who actually has a clue. > > Ok �� although this is jack2 built *without* dbus and running on a headless RPi3. Yes, D-Bus is only one part of Linux session handling. Both systemd (most likely your init system) and PAM will do some magic. To find out where your jack client expexts jackd's socket run: $ strace -e connect,open jack_lsp -c > /dev/null Cheers, RalfD

6 years, 9 months

Re: [Jack-Devel] Usage feasibility Q

by Robert Bielik

> Yes, I managed to get it working with that guide, however now I have > intermittent problems when rebooting, I think it is due to the LD cache, > sometimes .so files in /usr/local/lib are not found. In these cases, when it doesn't work I get: Could not open driver directory /usr/lib/arm-linux-gnueabihf/jack: No such file or directory Could not find any drivers in driver directory! Failed to create server object So I do: sudo ldconfig /usr/local/lib/ and voila, it works again. As you probably can tell, Linux is not my forte... Regards /R

6 years, 9 months

[Jack-Devel] Retrieving Port ID

by Thomas Brand

Hi, when looking at jack_evmon output, it tells numeric port ids when a new port is registered, unregistered or connected. I wondered if there is an API method to get the same number from a jack_port_t or port name string. Best regards Thomas

6 years, 9 months

Re: [Jack-Devel] Using USB sound card with Jack

by Chris Caudle

On Mon, January 15, 2018 10:13 am, Benny Alexandar wrote: > I want both PC and USB sound card ports to be accessed at the same time. The design of jackd (really any sound server) requires it to be synchronized to the sampling clock of the interface, and since your two interfaces are not synchronized to each other then jackd cannot use both at the same time without some intervention. Using two at the same time requires choosing one card to the be the main backend device, then loading a sample rate converter to make the sample stream rate to and from the secondary card(s) match exactly that of the main card. The packages you want are zita-alsa2jack and zita-jack2alsa, in Fedora both come together in a package named zita-ajbridge. This is covered in the jack FAQ, which needs to be updated, the section describing alsa_in and alsa_out bridges is the relevant section, but those older implementations had some problems, the zita bridges are higher quality replacements. http://jackaudio.org/faq/multiple_devices.html The zita tools are included in the audio aware distributions, if you are using a distribution which does not package them for some reason you can get them along with the other zita applications here: https://kokkinizita.linuxaudio.org/linuxaudio/ The jackd v1 implementation includes the equivalent of the zita bridges internally, they need to be enabled from the command line but not loaded as an external component. The jackd v2 implementation (I think you said you were using jackd 1.9.12, that is considered jackd v2) does not yet include the zita bridges as part of the server, you will need to load them externally. -- Chris Caudle

6 years, 9 months

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JackAudio January 2018