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602 discussions

[Jack-Devel] Suggestion for an example program

by Peter Hoppe

Hi! In reference to https://github.com/jackaudio/example-clients: I saw the code as part of a question on Stackoverflow (http://stackoverflow.com/q/29748082/6544953). Would it be possible to include the source code below as an example? * There's already a midi controlled synth application in that repo (midisine.c). But I feel the example demonstrates in a clearer way how to send audio to the sound card's stereo output, because it just uses audio data, not audio data plus midi handling. * There's also the simple client example (simple_client.c), but that one (effectively) handles bi-directional audio data streaming. This client just sends audio data which makes it clearer how to use data output (and, by implication, data input). Long story in short - this example is clearer to n00bs (like me). Thank you for your consideration! > |/** @file simple_client.c * * @brief This simple client demonstrates > the basic features of JACK * as they would be used by many > applications. > */#include<stdio.h>#include<errno.h>#include<stdlib.h>#include<string.h>#include<math.h>#include<signal.h>#ifndefWIN32 > #include<unistd.h>#endif#include<jack/jack.h>jack_port_t*output_port1,*output_port2;jack_client_t*client;#ifndefM_PI > #defineM_PI (3.14159265)#endif#defineTABLE_SIZE > (200)typedefstruct{floatsine[TABLE_SIZE];intleft_phase;intright_phase;}paTestData;staticvoidsignal_handler(intsig){jack_client_close(client);fprintf(stderr,"signal > received, exiting ...\n");exit(0);}/** * The process callback for this > JACK application is called in a * special realtime thread once for > each audio cycle. * * This client follows a simple rule: when the JACK > transport is * running, copy the input port to the output. When it > stops, exit. > */intprocess(jack_nframes_tnframes,void*arg){jack_default_audio_sample_t*out1,*out2;paTestData > *data =(paTestData*)arg;inti;out1 > =(jack_default_audio_sample_t*)jack_port_get_buffer(output_port1,nframes);out2 > =(jack_default_audio_sample_t*)jack_port_get_buffer(output_port2,nframes);for(i > =0;i<nframes;i++){out1[i]=data->sine[data->left_phase];// left > out2[i]=data->sine[data->right_phase];// right data->left_phase > +=1;if(data->left_phase >=TABLE_SIZE)data->left_phase > -=TABLE_SIZE;data->right_phase +=10;// higher pitch so we can > distinguish left and right. if(data->right_phase > >=TABLE_SIZE)data->right_phase -=TABLE_SIZE;}return0;}/** * JACK calls > this shutdown_callback if the server ever shuts down or * decides to > disconnect the client. > */voidjack_shutdown(void*arg){exit(1);}intmain(intargc,char*argv[]){constchar**ports;constchar*client_name;constchar*server_name > =NULL;jack_options_toptions > =JackNullOption;jack_status_tstatus;paTestData data;inti;/*if (argc >= > 2) { // client name specified? client_name = argv[1]; if (argc >= 3) { > // server name specified? server_name = argv[2]; int my_option = > JackNullOption | JackServerName; options = (jack_options_t)my_option; > } } else { // use basename of argv[0] client_name = strrchr(argv[0], > '/'); if (client_name == 0) { client_name = argv[0]; } else { > client_name++; } }*/client_name ="mytest";for(i > =0;i<TABLE_SIZE;i++){data.sine[i]=0.2*(float)sin(((double)i > /(double)TABLE_SIZE)*M_PI *2.);}data.left_phase =data.right_phase > =0;// open a client connection to the JACK server client > =jack_client_open(client_name,options,&status,server_name);if(client > ==NULL){fprintf(stderr,"jack_client_open() failed, ""status = > 0x%2.0x\n",status);if(status &JackServerFailed){fprintf(stderr,"Unable > to connect to JACK server\n");}exit(1);}if(status > &JackServerStarted){fprintf(stderr,"JACK server started\n");}if(status > &JackNameNotUnique){client_name > =jack_get_client_name(client);fprintf(stderr,"unique name `%s' > assigned\n",client_name);}// tell the JACK server to call `process()' > whenever//there is work to be > done.jack_set_process_callback(client,process,&data);// tell the JACK > server to call `jack_shutdown()' if//it ever shuts down, either > entirely, or if it//just decides to stop calling > us.jack_on_shutdown(client,jack_shutdown,0);// create two ports > output_port1 > =jack_port_register(client,"output1",JACK_DEFAULT_AUDIO_TYPE,JackPortIsOutput,0);output_port2 > =jack_port_register(client,"output2",JACK_DEFAULT_AUDIO_TYPE,JackPortIsOutput,0);if((output_port1 > ==NULL)||(output_port2 ==NULL)){fprintf(stderr,"no more JACK ports > available\n");exit(1);}//Tell the JACK server that we are ready to > roll. Our// process() callback will start running now. > if(jack_activate(client)){fprintf(stderr,"cannot activate > client");exit(1);}// Connect the ports. You can't do this before the > client is// activated, because we can't make connections to clients// > that aren't running. Note the confusing (but necessary)// orientation > of the driver backend ports: playback ports are// "input" to the > backend, and capture ports are "output" from// it.ports > =jack_get_ports(client,NULL,NULL,JackPortIsPhysical|JackPortIsInput);if(ports > ==NULL){fprintf(stderr,"no physical playback > ports\n");exit(1);}if(jack_connect(client,jack_port_name(output_port1),ports[0])){fprintf(stderr,"cannot > connect output > ports\n");}if(jack_connect(client,jack_port_name(output_port2),ports[1])){fprintf(stderr,"cannot > connect output ports\n");}jack_free(ports);// install a signal handler > to properly quits jack client #ifdefWIN32 > signal(SIGINT,signal_handler);signal(SIGABRT,signal_handler);signal(SIGTERM,signal_handler);#elsesignal(SIGQUIT,signal_handler);signal(SIGTERM,signal_handler);signal(SIGHUP,signal_handler);signal(SIGINT,signal_handler);#endif// > keep running until the Ctrl+C while(1){#ifdefWIN32 > Sleep(1000);#elsesleep(1);#endif}jack_client_close(client);exit(0);}|

9 years, 6 months

Re: [Jack-Devel] helpful stuff

by Daniele Torelli

Hi! I know you're interested in stuff like that, so I think that information is gonna be helpful to you, read it here please <http://nophustupu.nicholasyost.com/e4sxf> Faithfully, Daniele Torelli

9 years, 6 months

Re: [Jack-Devel] many thanks

by Daniele Torelli

Hello friend, I wanted to thank you a lot for all you've done, it was a real help. Please read my whole message here <http://jisethyzo.juliaburnessjewellery.com/e4taq> Yours faithfully, Daniele Torelli

9 years, 6 months

[Jack-Devel] [jackaudio/jack1] 04a18e: Removes use of gloabl jack_tmpdir.

by Paul Davis

Branch: refs/heads/master Home: https://github.com/jackaudio/jack1 Commit: 04a18e8914a1f1c2d5e43bcaeb2fd44b37b9cfe6 https://github.com/jackaudio/jack1/commit/04a18e8914a1f1c2d5e43bcaeb2fd44b3… Author: Uladox <uladoxiental(a)gmail.com> Date: 2016-08-14 (Sun, 14 Aug 2016) Changed paths: M include/internal.h M jackd/engine.c M jackd/jackd.c M libjack/client.c Log Message: ----------- Removes use of gloabl jack_tmpdir. Uses static local variable like how jack_user_dir does. jack_get_tmpdir() replaces jack_tmpdir for the most part except in jackd -l where it would cause an infinite loop, and instead DEFAULT_TMP_DIR is used, which is what it would happen anyway. Also in jack_user_dir the default value is used if jack_user_dir returns NULL from some error, but an error message is printed with jack_error(), this is the same as the old behavior, but I am not sure this is quite what should happen. Still, the exact same behavior as before is acheived except without the use of the jack_tmpdir global and the memory issues caused by calling jack_get_tmpdir(). Commit: 0880dfaaf0509f4508c7ec47497793bf7f675f99 https://github.com/jackaudio/jack1/commit/0880dfaaf0509f4508c7ec47497793bf7… Author: Paul Davis <paul(a)linuxaudiosystems.com> Date: 2016-08-29 (Mon, 29 Aug 2016) Changed paths: M include/internal.h M jackd/engine.c M jackd/jackd.c M libjack/client.c Log Message: ----------- Merge pull request #47 from Uladox/master Fixed leaked memory with jack_tmpdir. Compare: https://github.com/jackaudio/jack1/compare/8a7253575c58...0880dfaaf050

9 years, 6 months

[Jack-Devel] fractional frame rates for alsa_in and alsa_out

by Markus Grabner

Hi! A while ago I initiated work on a Linux driver for Line6 devices (now under sound/usb/line6 in the Linux kernel tree). Some of these devices have weird sample rates (39062.5Hz, derived from the 10MHz USB clock divided by 256). The alsa_in and alsa_out jack clients are convenient tools to use such Line6 devices together with more standardized hardware operating at, e.g., 48kHz. However, alsa_in only supports integer sample rates, and even after a couple of minutes, alsa_in doesn't detect the correct resampling factor 1.2288 (48000/39062.5), but still reports the initial approximated value 1.228816 (48000/39062). Admittedly, the error isn't too big, but is larger than the error of high-quality crystal oscillators. And, after all, why use an approximation if we know better? I modified alsa_in and alsa_out such that they accept a sample rate in floating point format (command line option "-r") and query the fractional sample rate from the ALSA driver to compute the initial estimation of the resampling factor (see attached patch). What do you think about this patch? Kind regards, Markus

9 years, 6 months

[Jack-Devel] netJACK2 with two nodes

by xan

Hello JACK community, I’m planning my new audio editing setup (both hard- and software) and before investing in hardware, I’d like to ask for advice. Here’s what I want to do: – Both computers run Linux. – On Computer A, I can browse the web and see Youtube videos, I can listen to MP3 files with Totem and I can do DAW stuff with Ardour. – Computer B does nothing more than getting all the sound output from A and feed it to the speaker through it’s soundcard. Here’s my theoretical approach: – Both computers run JACK. – A runs PulseAudio in top of JACK. – A runs with the net backend using netJACK2. – B has the Net Manager loaded which gets the audio from A and pipes it to the soundcard. – Every time I boot the two computers, they are ready to work. No daemons I have to launch manually, etc. I want the configuration to be done one time for all. I got my understanding of JACK through the network from here: https://github.com/jackaudio/jackaudio.github.com/wiki/WalkThrough_User_Net… And this site would also be my guide for setting up the thing. But I’m not a JACK expert at all. It’s the first time I’m doing something like this. So I want to make shure I got the basics right. And, maybe you now even a better step-by-step tutorial which does exactly what I want. So, I appreciate any comments on this. Bye, xan

9 years, 6 months

[Jack-Devel] FFADO 2.3.0 released

by Jonathan Woithe

The FFADO developers are pleased to announce FFADO version 2.3.0, a package of userspace drivers for firewire audio interfaces. While there are no significant new features in this version compared to the last, FFADO 2.3.0 contains a large number of incremental improvements. Users of FFADO are encouraged to upgrade. This source-only release can be downloaded from the ffado.org website at http://ffado.org or via the direct link: http://ffado.org/files/libffado-2.3.0.tgz Notable changes include: * Configuration entries added for additional devices which work with the generic support layer (PreSonus Studiolive 32.4.2, Presonus StudioLive 16.0.2, ICON FireXon, Onyx Blackbird and the new Onyx 1640i, among others). * Support added for the newer Focusrite Saffire Pro 26. * Improved build support for various downstream consumers. * Better routing for selected Saffire devices and the Firestudio Mobile. * Significant cleanup and refinement of the M-Audio and Yamaha driver. * Compilation fixes for recent versions of gcc. * Recover from dead streams without causing jackd to shut down. Thanks go out to the developers and users who contributed code and information which went into this release: Kristian Amlie, Melanie Bernkopf, David Binderman, Philippe Carriere, Yves Grenier, Florian Hofmann, Hector Martin, Mathieu Picot, Philippe Ploquin, Stefan Richter, Takashi Sakamoto, Jano Svitok, Karl Swisher, Steven Tonge and Jonathan Woithe.

9 years, 7 months

[Jack-Devel] unsubscribe

by Wolfgang Wilde

9 years, 7 months

[Jack-Devel] unsubscribe

by Wolfgang Wilde

9 years, 7 months

[Jack-Devel] (no subject)

by Tom Law

I just installed Ubuntu trusty (on crouton on an Acer Chromebook), and am trying to get sound going (so I can run Super-Collider.) Upon the advice of various webpages I've come across that discuss installation of Super-Collider, I've tried: - removing pulseaudio - adding myself to the "hwaudio" group - adding '@audio' entries to /etc/security/limits.conf But I always get "Could not connect to JACK server as client" when I run qjackctl. This is the output I get when I run qjackctl. I've tried changing the interface to both 'cras' and 'hw:DAISY12S', but neither work. 23:54:23.518 Patchbay deactivated. 23:54:23.585 Statistics reset. 23:54:23.598 ALSA connection change. 23:54:23.643 D-BUS: Service not available (org.jackaudio.service aka jackdbus). 23:54:23.667 JACK is starting... 23:54:23.668 /usr/bin/jackd -dalsa -dcras -r44100 -p1024 -n2 23:54:23.686 ALSA connection graph change. jackd 0.122.0 Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others. jackd 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 JACK compiled with System V SHM support. loading driver .. apparent rate = 44100 creating alsa driver ... cras|cras|1024|2|44100|0|0|nomon|swmeter|-|32bit Couldn't connect to cras. control open "cras" (Operation not permitted) configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: cannot set hardware parameters for capture ALSA: cannot configure capture channel cannot load driver module alsa (qjackctl:13298): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed (qjackctl:13298): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed 23:54:23.980 JACK was started with PID=13310. 23:54:24.042 JACK was stopped successfully. My apologies if I'm asking this in the wrong place, or if I'm not giving enough info. I'll ask elsewhere if that's more appropriate. But any advice or suggestions would be much appreciated!

9 years, 7 months

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