Portaudio backends

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm currently experimenting with real-time signal processing, so I went and tried out PortAudio from C.

It does nothing else in the callback. No memory allocation, no system calls, nothing it could block on. It just outputs what it has read. The code is very simple, still I can't get it running. Between each try, ALSA has been tested if it's still responsive sometimes it got completely "locked up", so that no application could output sound any longer and rebooted the system in case ALSA got "locked up", then continued the testing.

In the scenarios where there is no output at all, I get the following error messages when using ALSA as backend. In either case, there's nothing interesting showing up in dmesg. Just checked that, since ALSA has a kernel-level component. Anyone knows what's the problem here and how I could fix it? Or at least, how I could narrow it down a bit more? When you write only a single block of samples, the playback device will run out of samples just when you're about to write the next block.

Learn more. PortAudio unreliable: Expression '…' failed Ask Question. Asked 4 years, 2 months ago. Active 20 days ago. Viewed 1k times. What I've tried: The following scenarios were tried out with PortAudio.

The problems I encountered: The results were as follows. Numbers represent the scenarios described above. No output from device. Output from device unsteady interrupted. All the time lots of buffer underruns. Output from device unrealiable. Sometimes it works, sometimes it doesn't. Without changing anything, just running the executable multiple times. When it works, screen piano starts off low, but increases over time and gets very noticeable.

More details, that might be useful when tracking the problem down: In the scenarios where there is no output at all, I get the following error messages when using ALSA as backend. Cannot lock down byte memory area Cannot allocate memory In addition, no matter what method I use, I always get these warnings. ALSA lib pcm. My question: Anyone knows what's the problem here and how I could fix it? Please show your code.Skip to content.

Supports Dummy backend, guaranteed to work even if computer has no sound card. Built-in support for channel layouts. PortAudio supports channel layouts on some backends with platform-specific extensions. Exposes both device id and friendly name. Errors are never dumped to stdio. Meticulously checks all return codes and memory allocations and has a plan for every edge case. Meanwhile, PortAudio is a mess. Ability to monitor devices and get an event when available devices change.

Ability to get an event when the backend is disconnected, for example when the JACK server or PulseAudio server shuts down. In the documentation, every function that can return an error documents what error codes it can possibly return. Written by a single person who has carefully read the documentation for every audio backend and understands the purpose of every line of code.

See 23 Supports DirectSound. Supports OSS, asihpi, wdmks, wmme. You are invited to file an issue if support for one of these backends would be beneficial to your use case. Supports older versions of Windows than Windows 7. Ability to open a stream simultaneously for input and output. See 27 Written by many people ; the "hit by a bus factor " is higher.

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portaudio backends

Reload to refresh your session. You signed out in another tab or window.It enables applications to use Spotify's service, without using the official but closed-source libspotify. Additionally, it will provide extra features which are not available in the official library.

You are however welcome to experiment with it. A sample program implementing a headless Spotify Connect receiver is provided. Once you've built librespotrun it using :. For that, simply omit the --username argument.

OpenSSL is required for this. This will print a link to the console, which must be visited on the same computer librespot is running on. Multiple backends can be enabled at compile time by enabling the corresponding cargo feature.

By default, only PortAudio is enabled. When developing librespotit is preferable to use Rust nightly, and build it using the following :. Come and hang out on gitter if you need help or want to offer some.

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Sign up for a free trial. Open Source Spotify client library Language: Rust librespot librespot is an open source client library for Spotify.

portaudio backends

Status librespot is currently under development and is not fully functional yet. Building Rust 1. Oct 26, You can subscribe to this list here. Showing 25 50 results of You seem to have CSS turned off. Please don't fill out this field. Please provide the ad click URL, if possible:. Help Create Join Login. Operations Management. IT Management. Project Management. Services Business VoIP. Resources Blog Articles Deals. Menu Help Create Join Login. Home Browse jOrgan Mailing Lists.

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We should also provide some help selecting the correct audio backend in GO. I'm currently drafting some notes about the backends: - Jack: Every plattform supports jack [if enabled in the build]. If you want to run GO inside a jack setup use that backend. GO support direct access to the sound hardware and jack adds complexity to the sound output stack, so avoid running jack just for GO sound output alone.

The portaudio jack backend [contains " PA " in its name] provides support for double buffering. The RtAudio jack backend requires matching sample per buffer and sample rate. Portaudio support double buffering.You might need to use yum, or some other package manager, instead of apt-get on your machine.

If you do not install ALSA then you might get a message when testing that says you have no audio devices. This step also builds a number of tests, which can be found in the bin directory of PortAudio. It's a good idea to run some of these tests to make sure PortAudio is working correctly. Projects built this way will expect PortAudio to be installed on target systems in order to run. If you want to build a more self-contained binary, you may use the libportaudio.

You may also need to copy portaudio. For example:. This file contains further documentation on the following functions:. PaAlsaStreamInfo type may be used for the! Specify the device via! Call this on the stream before starting it with the enableScheduling parameter set to true or false, to enable or disable this behaviour respectively. Without this, low latency audio playback will be irregular and will contain frequent drop-outs.

On linux build, use e.

Instructions on using the PortAudio driver in the Fluidsynth Extension

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm looking for a lightweight way to make my program written in C be able to play audio files on either windows or linux.

I am currently using windows native calls, which is essentially just a single call that is passed a filename.

portaudio backends

I would like something similar that works on linux. Since I'm also looking for an answer for question I did a bit of research, and I haven't find any simple simple like calling one function way to play an audio file. But with some lines of code, it is possible even in a portable way using the already mentioned portaudio and libsndfile LGPL. Some notes to the example. It is not good practice to do the data loading inside of the stream callback, but inside an own loading thread.

If you need to play several audio files it becomes even more difficult, because not all portaudio backends support multiple streams for one device, for example the OSS backend doesn't, but the ALSA backend does.

I don't know how the situation is on windows.

libsoundio vs PortAudio

Since all your input files are of the same type you could mix them on you own, which complicates the code a bit more, but then you'd have also support for OSS. If you would have also different sample rates or number of channels, it'd become very difficult.

So If you don't want to play multiple files at the same time, this could be a solution or at least a start for you. OpenAL is another cross platform audio library that is more geared towards 3D audio. Yet another open source audio library that you might want to check it out is PortAudio. I like FMOD. The license is free for personal use, and very reasonable for small shareware or commercial projects.

portaudio backends

You could also try Audiere. The last release is datedbut it is open-source and licensed under the LGPL. Learn more. What is a lightweight cross platform WAV playing library? Ask Question. Asked 11 years, 4 months ago. Active 7 years, 9 months ago.

coding pcx.mccartanpremiumplay.pw (screen recording)

Viewed 7k times. Jon Seigel Loki Loki 5, 4 4 gold badges 20 20 silver badges 35 35 bronze badges. Active Oldest Votes. Awesome little program! You can try with this one: libao. Marc Marc 1, 2 2 gold badges 10 10 silver badges 15 15 bronze badges. AShelly AShelly I used irrKlang! Emadpres Emadpres 2, 1 1 gold badge 24 24 silver badges 39 39 bronze badges. Note that you must pay a licensing fee to use in commercial products it's relatively small though.


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