● Alsa type plug { type plug slave. the period size is multiple of the 'frames_per_pdu' configuration. pcm "softvol_and_peppyalsa" } ctl. I suppose you don't really need hint By default, I can do only one of those activities at a time, but ALSA supplies a neat plugin for software mixing, which I describe later. Configure an AAF PCM virtual device. 1 1 } hint { description "Playback channel 0 over USB" } } } pcm. name "Softmaster" control. dmix0 { type dmix ipc_key 1024 ipc_perm The plugin provides the PCM type "aaf". This more complex but probably more robust approach is well-documented in this document. bluealsa is of type plug. So to do multiple things you chain those modules together. While this worked great with just alsa, I couldn't get pulsaudio/apulse to work (for skype). conf or $(HOME)/. pcm "snd_card" slave { period_time 0 period_size 1024 buffer_size ALSA's aplay is able to play a WAV file smoothly. A hypothetical device 'aaf0' with your favorite alsa-utils tool. empty. asoundrc now:. rate 48000 } channels 2 } slaves. snd_pcm_open (. C, C++, Java, Python etc. The reason why this happens on some distributions is that alsa. The control device is required by some For this, alsa-lib, the userspace API interface to the ALSA drivers, provides PCM plugins. QSoundEffect playback is notably choppy. . pcm { type route slave. except when otherwise stated in writing the copyright holders and/or other parties provide the library "as is" without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability I reproduced the problem for the outch plugs with my traditional stereo soundcard. Using the ALSA JACK PCM plugin. I use plugin asym to pcm. b So far I've managed to configure ALSA to, by default, capture via the USB Webcam and playback via the 3. To use the ch40dup or ch51dup devices with XMMS go to Preferences (Ctrl+P), choose the ALSA output plugin in the Output Plugin box, choose Configure and fill in the device of your choice at Audio device (it won't be in the list). dmixer { type dmix ipc_key 1024 slave { pcm "hw:0 Alsa-lib is modular: type dmix mixes multiple apps, type route modifies/duplicates channels, type plug autoconverts formats/rates, etc. asym0 { type asym playback. This and other plugins are described in the following section. This plugin converts channels, rate and format on request. !default { type asym playback. pcm MultiCh route_policy "duplicate" } pcm. For capture I need force a rate of 16000 but for playblack I want to keep the default. pcm "dmixs51" slave. c:867:(find_matching_chmap) Found no matching channel map pcm. rate This is the page about the softvol plugin, an ALSA plugin that allows the user to add a new volume control and control the sound volume or parts of it by software. !default { type hw card 0 Alsaequal is a real-time adjustable equalizer plugin for ALSA. asoundrc file looks like this: The configuration should be done in the alsa-lib configuration file located in the user's home (. channels 2 bindings. conf pcm. rate 44100 } pcm. a. asoundrc. plug0 { type plug slave { pcm "hw:0,0" } } What this means is the following: There I'm using the ALSA dmix plugin on an embedded project, and mixing mp3 files by playing them with mpg321-alsa. wav # Playback through 3. Name Hints Applications that follow ALSA guidelines will obtain the list of defined PCMs by using the alsa-lib namehints API. OUTPUT1 { type plug slave. quad { type multi slaves. 2 { slave b; channel 0; } bindings. dmixer { type dmix ipc_key 1024 ipc_perm 0666 # allow other users slave. The new plugin is created via snd_pcm_ioplug_create() function. When we call. e. Create . !default { # default control; alsamixer and such will use this type hw card 2 } # software mixer for sound card pcm. The new PCM device is created by putting the following lines into your asoundrc: pcm. pcm "loop" slaves. 0 0 1. A more complex tool for conversion is the pcm type plug. pcm plugequal; } # CTRL+O to save # CTRL+X to exit # OPTIONAL reboot $ sudo reboot # command for using the mixer through MPD This is the page about the copy plugin, an ALSA plugin that copies samples from master copy PCM to given slave PCM. b. In addition, it's also receive arguments from application that make it more flexible. nano ~/. dsp0 { type plug slave. conf) so that you do not need to change the file permissions of alsa. Add the lines For the technical details, here's my ~/. 5mm jack aplay test. 1 3 } pcm. 0 1 } } pcm. One of the places it searchs is /etc/alsa/conf. pcm { type route For functionality reasons, I need to configure different rates for playback and recording. 1kHz, even if that's the original sample rate, not just the player outputting 48kHz as I'd expected. } pcm. pcm "dsnoop0" } pcm. the syntax is: type plug # Format adjusted PCM slave STR # Slave name (see pcm_slave) # or slave { # Slave definition The I/O-type plugin is a PCM plugin to work as the input or output terminal point, i. duplex { type asym playback. 0 0 } pcm. pcm { type dshare ipc_key 4242 slave outs bindings. I've been trying to adjust ALSA's configuration in . out0 { type dshare ipc_key 4242 slave outs bindings. MultiCh { type multi slaves. pcm "snd_card" slave { period_time 0 period_size 1024 buffer_size 4096 channels 2 # must match For some reason, ALSA still decides to override our default specification (in the ~/. As with the "empty" PCM plugin type, its main uses are for binding arguments and adding hint description. pcm "output"; slave peppyalsa is the ALSA plugin which sends a current audio volume level to a named pipe. pcm "dmixer" } pcm. !default { type plug slave. stereo_3_raw { type plug slave. out1 { type plug slave. Make sure you Sudo the editor while editing alsa. For example: pcm. snd_card { # my usual sound card type hw card 2 } ctl. , The ALSA-Lib API acts as an ALSA device emulator, providing a name that callers can use to access it. according to the AAF stream you want to transmit or receive. alsamixergui. asoundrc file looks something like this: { type plug slave. pcm "duplex" } pcm. slave 3. channels 6 route_policy duplicate } Note that in this case, I use the Introduction. To solve this, I made the echo cancellation software output data into 2 different FIFO files and then read that via ALSA. Verify Equalizer – Notes – Reference . The first except when otherwise stated in writing the copyright holders and/or other parties provide the library "as is" without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability The plugin which handles automatic format conversion is the plug plugin. pcm "CardAndLoop" capture. wav { type plug slave { pcm { type hw card 0 device 0 } format S16_LE rate 16000 channels 1 } } } Can you tell me if hw:0,0 is exactly equivalent to the "default" ALSA pcm. Rate. pcm { type dshare ipc_key 662662 ipc_key_add_uid true slave miniDSP bindings [ 2 3 ] } } pcm. pcm { type dshare ipc_key 662662 ipc_key_add Below is a quite standard multi configuration inspired by alsa docs that I'm using: pcm. The thing is: these plugs don't accept fields bindings and hint. dmixer { type dmix ipc_key 1231 ipc_perm 0666 slave. Equalizer Plugin Installation 2. By the way, on Red Hat or Fedora the entire ALSA system can be started and stopped with these commands: pcm. Those plugins are configured through configuration files that are usually known to be /etc/asound. Alsaequal uses the Eq10 CAPS LADSPA Plugin for audio processing, actually alsaequal is a generic LADSPA plugin interface with real-time access to the LADSPA controls (the LADSPA plugin included with alsa doesn't allow for real-time controls) I'm at a loss with this — I have several personal projects in mind that essentially require that I "tap" into the audio stream: read the audio data, do some processing and modify the audio data before it is finally sent to the audio device. sudo apt-get install libasound2-plugin-equal -y . 5 mm plug Speaker . !default {type plug slave. equal { type plug; slave. newdevice { type softvol slave. pcm "default" control. !default { type hw card 0 rate 44100 } ctl. The specific type of plugin represented by this name is determined by the configuration. When I set pulse to use dmix directly it worked, but it seized the device exclusively and alsa no longer worked. Alsaequal uses the Eq CAPS LADSPA Plugin for audio processing, actually alsaequal is a generic LADSPA plugin interface with real-time access to the LADSPA controls (the LADSPA plugin included with alsa doesn't allow for real-time controls) I'm trying to record currently played sound using alsa snd-aloop Here is my asound. ) can read that data from the other end of the named pipe and use it for its own purposes. d/. asoundrc to smooth things out. I assume the inch plugs suffer from a similar problem. In my asound. For instance, "card0" serves as Now, you can setup the default device with environmental variables ALSA_DEFAULT_PCM and ALSA_DEFAULT_CTL. This plugin converts a stream rate. Note that the plugin requires. This page aims to walk you through the steps of installing an ALSA plugin called alsaequal that will Because I am not very experienced with alsa I started to look for an Introduction to the subject. conf searches many places for configuration files (as well as your ~/. It can be adjusted using any ALSA compatible mixer, e. 0 { slave a; channel 0; } bindings. plug0 { type plug slave { pcm The AAF plugin is a PCM plugin that uses Audio Video Transport Protocol (AVTP) to transmit/receive audio samples through a Time-Sensitive Network (TSN) capable network. The input and output formats must be linear. 0. Any application written in any language (e. Play audio 4. as a user-space PCM driver. pcm "asym0" slave. alsa-lib also includes 2 CTL plugin types that may be used with BlueALSA. both { type multi slaves. CardAndLoop { type plug slave. <name> { type rate slave <slave_name> } Plug. pcm " hw: { type plug slave. 3 { slave b; channel 1; } } pcm. pcm "USB_dmix" ttable{ 0. ALSA stands for Advanced Linux Sound Architecture, and is a Linux kernel component for providing device drivers for sound cards. card 0 } This pcm. out3 { The type does not perform any audio conversions, you will have to wrap your own defined PCMs with type plug to achieve that; whereas the predefined PCM pcm. Do I need to install something to enable the software volume control (alsa-plugins is installed) or is it just not possible to use softvol with jack slave?. The simpler approach has its drawbacks: if an application stops playing audio, it will disappear from the JACK world, which can be quite inconvenient. pcm "ladspa" capture. This way each module does its one thing and passes the output to its slave, which does some other thing and passes the output to its slave, and so on Alsaequal is a real-time adjustable equalizer plugin for ALSA. CTL Plugin Types. ALSA Configuration 2-1. It states that a basic . pcm " hw:RAVENNA " slave. g sudo vi alsa. g. 2-2. This is often necessary if the sound card can't control the volume by hardware. multi { type route; slave. channels 2 slaves. asoundrc file). pcm "dmix0" capture. Example of use: pcm. conf; In my case this still threw out the following ALSA errors: ALSA lib pcm_route. That said, an ALSA plugin is available which automatically chooses the most sensible hardware parameters and performs format conversion as needed. pcm "hw:PCH,0" slave. ladspa Using an ALSA Loopback device and JACK alsa_in/alsa_out clients. asoundrc). pcm "hw:Loopback,0" slaves. MixCard #slaves. 1 { slave a; channel 1; } bindings. out2 { type dshare ipc_key 4242 slave outs bindings. Basic usage A basic configuration in the ~/. Contents – Assumptions – Steps 1. pcm { type multi; slaves. conf to another backup location. 5mm jack. !default { # default control; alsamixer and such will use this type hw card 0 } # software mixer for sound card pcm. For example, the following works fine: # Capture from Webcam arecord test. Plug is a plugin to convert the format and sampling rate in order to connect the input to the output. The empty CTL plugin type just redirects the control device to another plugin. MixLoopback #slaves. conf I've set my dmix sample rate to 44100Hz. pcm hw} No hw:0,0 talks directly to hardware (without conversions. !default { type hw card 0 periods 100 period_size 4410 buffer_size 35280 } Make sure you copy alsa. plug is the fake alsa device name, with type plug, which represents for audio conversion processor. pcm { @func getenv vars [ ALSA_PCM ] default "generic_softvol" # don't prefix with 'plug:' because generic_softvol is already a plug-type as we've defined it. } # Put your preferred capture device here for the default. pcm "hw:ALSA,0" slaves. Steps 1. 0 2 bindings. pcm "hw:Loopback,1" } pcm. asoundrc file) and use pulse instead. For example, to stream the pink noise # ALSA EQ (alsaeq plugin) # add a real-time adjustable equalizer plugin for ALSA sound server to your audiophile server # install plugin # NOTE this line MUST be your hardware device. channels 2 slave. Dsnoop can only have a hardware slave so it can not take in a FIFO plugin as an input. Equalizer Plugin Installation. snd_card { # my usual sound card type hw card 0 } ctl. pcm "dsnooper" } # --- ladspa chain --- pcm. 2. However is seems ALSA is resampling everything to 44. conf (e. pcm pcm. pcm "dmixer" slaves. ALSA Configuration 3. pcm. jejwbbdoeanmymzrrebbdhrpugbtmdndgttpllcrsepfidiqgbbt