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ALSA (Advanced Linux Sound Architecture ) is an API of audio functions for the linux platform.

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In ALSA, every device uses its own hardware sample rate clock. So errors between different clocks can accumulate. So far, I have not seen an ALSA driver that allows for clock rate adjustments … , neither with a file nor otherwise. But that doesn't mean the ALSA driver for your particular sound card is not the exception, and allows you to do it somehow. I don't think you can directly access the …
answered May 10 '18 by dirkt
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combinations for your hardware using more options, or use plughw instead of front. For more modern ALSA installations, plughw entries are automatically generated, and they put a plug plugin in front of the … real hardware to do format conversion. If your ALSA doesn't generate those automatically, you have to add them manually to your .asoundrc. There are other ways to do it, for example with a chain of …
answered Jan 18 '17 by dirkt
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from a Pulseaudio application. Use the -n option to give it a client name specific to your process (like paplay -n "sinusoid generator"). 1c) If your processes produce sound using ALSA, choose pulse as …
answered Jan 31 '17 by dirkt
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If you run both Pulseaudio and ALSA, what happens is that Pulseaudio provdes a compatibility layer as default, using a configuration similar to pcm.!default pulse ctl.!default pulse That means if … you snd_pcm_open the default device, you talk to Pulseaudio, which then routes you according to the preference stored for the application name. Pulseaudio also opens ALSA devices when it uses them …
answered Jun 2 '17 by dirkt
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the parameters for your device, not these), or you can use a conversion plugin that ALSA automatically makes available for each device, as in arecord -D plughw:0,0 ... out.wav and then it will … convert to whatever format you specify. The same applies to any other application that tries to record via ALSA. You can also set up your own ~/.asoundrc with reasonable defaults, if you want. Use …
answered Apr 20 '17 by dirkt
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Windows this doesn't matter, because the pre-installed driver ignores the BIOS information and uses the correct (known) assignment. Have a look at hdajackretask and hdajacksensetest (package alsa
answered Nov 24 '17 by dirkt
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existing software for that both for ALSA and Pulseaudio, used e.g. in Smartphones that are based on Linux. Basically, the algorithm has to correlate the received input with the sent output to measure the …
answered May 20 '18 by dirkt
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No, you'll need other ALSA plugins for any type of conversion (sample rate, channels, ...). Or you can go the easy route and use Pulseaudio (which comes as part of most distros today anyway): Its …
answered Aug 2 '18 by dirkt
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Not sure if ALSA can do that. Is Pulseaudio an option? It decouples transport from the sources/sinks, so use a Pulseaudio module to create two sources for right and left. Then you can suspend …
answered Jan 16 by dirkt
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particularly easy to parse, and needs a bit of fiddling with grep -A etc. Pulseaudio includes a compatibility layer to allow all ALSA applications to use Pulseaudio, via the pulse ALSA device. If you … have an .asoundrc like pcm.!default pulse ctl.!default pulse then every ALSA application will use Pulseaudio by default (unless you configure it to use a different ALSA device). Some ALSA
answered Mar 17 '18 by dirkt
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Guess: Something else is using your card on boot before Pulseaudio starts. As ALSA only allows one process to use the hardware device, Pulseaudio detects the device is in use, and therefore doesn't …
answered Jul 25 '18 by dirkt
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ALSA mixer setting, but only for the sink which is connected to the ALSA hardware, and I don't see an easy way to change this. …
answered May 1 '18 by dirkt
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. You may have to fiddle with the profile sets in /usr/share/pulseaudio/alsa-mixer/ if you actually plan to do this. You can split off channels as additional sinks easily in Pulseaudio with the module-remap-sink module. …
answered Jan 13 '18 by dirkt
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You cannot decode ogg files with aplay. According to the man page, the only formats aplay understands are voc, wav, raw and au. My guess is that aplay interprets the ogg file as raw data, hence the wh …
answered May 5 '17 by dirkt
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audio system used in Linux is ALSA. It has become part of the kernel, and provides drivers for the hardware. Devices look like /dev/snd/pcmC0D0p (card 0, device 0, playback) or /dev/snd/pcmC1D2c (card … 1, device 2, capture), but everybody uses a library (libalsa) instead the devices directly, because you can't pipe stuff into them as for /dev/dsp. ALSA can be configured via /.asoundrc, but this …
answered Dec 31 '17 by dirkt

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