alsa-lib | ALSA library
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Trending Discussions on alsa-lib
QUESTION
I would like to make the minimal working code to generate any kind of PCM sound using ALSA
in C++
for a Linux
computer.
I'm coding in C++
on Code::Blocks
with Ubuntu 20.04
.
I used to make simple Arduino UNO
programs doing sound processing and just needed to play raw PCM samples.
ALSA Project's Website is not very easy to understand.
I looked at c - ALSA tutorial required to find out that many links are expired.
I copy pasted the code of the minimal PCM example in C directly into a empty Code::Blocks project and I got that error:
...ANSWER
Answered 2020-Aug-21 at 18:00Follow these steps:
- Install the ALSA development package, or make sure it is already installed. The name depends on your distribution. In my case (OpenSUSE Tumbleweed) it is alsa-devel. This will install the file asoundlib.h under the directory /usr/include/alsa.
- Change the line in your code from
#include "../include/asoundlib.h"
to#include
. Notice the angular brackets instead of quotation marks. - The library which you want to link against is named libsound.so, so compile the program with a command like
gcc -Wall pcm_min.c -lasound -o pcm_min
- Run the program:
./pcm_min
QUESTION
I'm trying to build a docker container on a Raspberry Pi 3B. I need to install gpac
for MP4Box
.
Dockerfile
...ANSWER
Answered 2020-Jun-20 at 13:58It ended up being wifi issues. Switching to a wired connection fixed the issues I was having.
QUESTION
I would like to display the result of 2 comboboxes in a listbox but I don't know how to do it...
Here's what I've got so far :
Depending on the left-hand combobox, it implies the results of the right-hand combobox.
1/ I would like to display the package version ($E) and the package release ($F) of the package name selected on the right-hand combobox for the project selected on the left combobox, ("monitoring" in this example).
2/ If I select "ALL" package name, I would like to display $E and $F.
Here is my current code :
...ANSWER
Answered 2020-Jan-02 at 17:27My rule is never use RowSource
. Generally, if you can put the information in an array, then you can assign that array to the Lisbtobx.List
property. The other method is to add a new item with AddItem
and then fill out the rest of the columns with the List()
property. Below is an example. I made some minor changes to your existing code and the ComboBox2_Change code I think is what you're interested in.
QUESTION
I'm trying to run a custom node command from within an Alpine linux docker container.
Installed packages:
...ANSWER
Answered 2018-Jan-17 at 07:08If you want to get puppeteer to work on alpine, try using an older version of puppeteer that works with an older version of Chrome. The newest version of Chrome supported on Alpine is 63, which was the version of Chrome used during the development of puppeteer version 0.11.0.
QUESTION
I have a vector with file names. Several of the files in the vector are repeated with different versions. For example
"ConsoleKit2-1.0.0-x86_64-3"
"ConsoleKit2-1.0.0-x86_64-4"
"Cython-0.23.4-x86_64-1"
"Cython-0.29.12-x86_64-1"
"GConf-3.2.6-x86_64-3"
"GConf-3.2.6-x86_64-4"
"LibRaw-0.17.2-x86_64-1"
"LibRaw-0.18.12-x86_64-1"
"M2Crypto-0.23.0-x86_64-1"
"M2Crypto-0.35.2-x86_64-1"
"MPlayer-1.2_20160125-x86_64-3"
"MPlayer-20190418-x86_64-1"
"Mako-1.0.13-x86_64-1"
"ModemManager-1.10.4-x86_64-1"
"ModemManager-1.4.14-x86_64-1"
"NetworkManager-1.18.1-x86_64-1"
"NetworkManager-1.2.2-x86_64-2"
"PyQt-4.11.4-x86_64-1"
"PyQt-4.12.1-x86_64-3"
"QScintilla-2.10.8-x86_64-2"
...ANSWER
Answered 2019-Sep-03 at 02:03Your code doesn't fail in the same way for me. If I run:
QUESTION
I'm running Apache 2.4 on FreeBSD (FAMP stack) and had Wordpress successfully hosting a website. However I recently tried to install phpLDAPadmin in order to manage an LDAP server and now whenever Apache is running, any page on my site displays the following:
Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /usr/local/www/apache24/data/wp-includes/wp-db.php:1643 Stack trace: #0 /usr/local/www/apache24/data/wp-includes/wp-db.php(639): wpdb->db_connect() #1 /usr/local/www/apache24/data/wp-includes/load.php(427): wpdb->__construct('user', 'pass', 'wordpressdb', 'localhost') #2 /usr/local/www/apache24/data/wp-settings.php(120): require_wp_db() #3 /usr/local/www/apache24/data/wp-config.php(92): require_once('/usr/local/www/...') #4 /usr/local/www/apache24/data/wp-load.php(37): require_once('/usr/local/www/...') #5 /usr/local/www/apache24/data/wp-blog-header.php(13): require_once('/usr/local/www/...') #6 /usr/local/www/apache24/data/index.php(17): require('/usr/local/www/...') #7 {main} thrown in /usr/local/www/apache24/data/wp-includes/wp-db.php on line 1643
The site is experiencing technical difficulties.
Furthermore, when I went to check the version of php, this happens:
...ANSWER
Answered 2019-Aug-29 at 16:30Ok, I finally fixed this!
The problem must have been related to upgrading PHP, probably from PHP 7.1 to PHP 7.2. I'm assuming this happened when I installed phpLDAPadmin, which is what triggered the issue.
Firstly, I was able to solve the segmentation fault/core dump issue by running the following:
QUESTION
I try to follow the path of parameters setting from linux user space (arecord/aplay) down to kernel driver. Let's take arecords --period-size as an example.
It all starts in set_params
function in aplay.c
:
ANSWER
Answered 2019-May-27 at 06:54The hw_params
structure contains a configuration space, which is a description of all possible configurations that the device can support. Numeric parameters are described as intervals (i.e., min and max), access and format as bitmasks.
When you change one parameter, the library calls the kernel driver (SNDRV_PCM_IOCTL_HW_REFINE
) to adjust all the other parameters in the hw_params
structure that depend on the changed parameter.
After you have reduced the configuration space to the configuration you actually want, you call snd_pcm_hw_params()
(→ SNDRV_PCM_IOCTL_HW_PARAMS
) to actually configure the device for those parameters. (If some parameter has not been reduced to a single value, snd_pcm_hw_params()
will choose a random one.)
snd_pcm_hw_params_set_xxx_near()
is more complex because there is no SET_NEAR
ioctl. This function tries to adjust the interval so that either its maximum or its minimum is the desired value, and then check whether the actual maximum or minimum is nearer.
For example, assume a device that supports period sizes of 1024, 2048, 4096, and 8192 frames. Initially, the interval is described as [1024, 8192]. When you call snd_pcm_hw_params_set_period_size_near(4000)
, the snd_pcm_hw_param_set_near()
helper function calls set_min(4000)
and set_max(4000)
(on separate copies of the hw_params
structure), so the intervals are [1024, 4000] and [4000, 8192]; after refining, the driver returns the intervals [1024, 2048] and [4096, 8192]. snd_pcm_hw_param_set_near()
then sees that 4096 is nearest to the desired calue, so it then calls set_first
on the second interval, which results in [4096, 4096].
QUESTION
I am trying to build meta-toolchain-qt5. However, I am getting these errors. I am following the guide - Guide Qt5 build
Here are the things I have done so far -
Inside poky -
...ANSWER
Answered 2019-May-22 at 02:23You have two options
First
tslib
is provided by meta-oe
layer so you need to get that layer and add that to your BBLAYERS
so inside your poky tree
QUESTION
I'm going crazy trying to ADD a directory from my host machine to my docker container. When building the container with docker-compose up --build, it seems to ADD just fine, but when I try to access module in my app.py file, I get the ModuleNotFoundError
My DockerFile contains the following:
...ANSWER
Answered 2019-Apr-01 at 01:12I may be missing some context but I think you've several issues:
- You
COPY /scraper...
andADD /common...
-- are these directories hanging from root on your local machine? - You set
WORKDIR
afterCOPY
andADD
but generally (although not required), you'd set this first as a default destination and then you couldCOPY something .
andADD something .
and these destinations (.
) would refer to yourWORKDIR
- You use
/home/scraper
as yourWORKDIR
but you don't copy and add your files into it. It will be empty at this point. - Your
ENTRYPOINT
referencesapp.py
but your file is calledtest.py
One useful debugging tool is to shell into containers to e.g. examine the directory structure to confirm it's as expected. Assuming your image is called scraper
, you could:
QUESTION
I have one docker file which setup chromium browser and chromium driver using alpine base image. Currently it is setting up latest version? Is there any way to specify version here?
...ANSWER
Answered 2019-Mar-26 at 16:06Unfortunately this is not possible. In theory you could use something like
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