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Send audio to sound card for playback using ALSA - Simulink
https://www.mathworks.com/help/supportpkg/raspberrypi/ref/alsaaudioplayback.html#:~:text=The%20ALSA%20Audio%20Playback%20block%20determines%20the%20sample,is%20the%20number%20of%20samples%20per%20audio%20channel.
Simple sound playback using ALSA API and libasound · GitHub
https://gist.github.com/ghedo/963382/815c98d1ba0eda1b486eb9d80d9a91a81d995283
* Simple sound playback using ALSA API and libasound. * * Compile: * $ cc -o play sound_playback.c -lasound * * Usage: * $ ./play <sample_rate> <channels> <seconds> < <file> * * Examples: * $ ./play 44100 2 5 < /dev/urandom * $ ./play 22050 1 8 < /path/to/file.wav * * Copyright (C) 2009 Alessandro Ghedini <[email protected]>
Send audio to sound card for playback using ALSA - …
https://www.mathworks.com/help/supportpkg/raspberrypi/ref/alsaaudioplayback.html
The ALSA Audio Playback block determines the sample time ( Ts) from the samples per audio channel ( N) and sampling frequency ( F s). For example, if N is 4410 samples and F s is 44,100 Hz, the block sample time is 4410/44,100 = 0.1 seconds. …
Send audio to sound card for playback using ALSA - …
https://www.mathworks.com/help/supportpkg/beaglebone/ref/alsaaudioplayback.html
Description. Send audio to the sound card for playback using the Advanced Linux Sound Architecture (ALSA) driver framework. The dimensions of the block input are N-by-2. N is the number of samples per frame and 2 is the number of audio channels. The data type of the block input must be int16. Use the Audio sampling frequency parameter to set the sampling rate in …
linux - ALSA: proper way to playback audio - blocking …
https://stackoverflow.com/questions/50103858/alsa-proper-way-to-playback-audio-blocking-mode-and-threads
ALSA <-> PulseAudio PCM I/O Plugin Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : FLOAT_LE subformat : STD channels : 1 rate : 44100 exact rate : 44100 (44100/1) msbits : 32 buffer_size : 192 period_size : 64 period_time : 1451 tstamp_mode : NONE tstamp_type : GETTIMEOFDAY period_step : 1 avail_min : 64 period_event : 0 …
Tutorial: ALSA Tutorial 1 - Initialization | Sound Programming
https://soundprogramming.net/programming/alsa-tutorial-1-initialization/
Globals are generally a bad idea, but in this case it keeps the example simple. The first call is to snd_pcm_open. One of the parameters is the sound device, into which we will pass "plughw:0,0", the default sound device, and a constant that tells the device we want to use it for playback.
Playing with ALSA loopback devices | Playing with Systems
https://sysplay.in/blog/linux/2019/06/playing-with-alsa-loopback-devices/
For example, audio played back into hw:2,0,4 could be captured from hw:2,1,4; audio played back into hw:2,1,7 could be captured from hw:2,0,7 – these are what are the loopbacks. A simple experiment could demonstrate the same. Start recording audio from hw:2,1,4: $ arecord -D hw:2,1,4 -f S16_LE -c 2 -r 48000 recorded.wav
Introduction to Sound Programming with ALSA | Linux …
https://www.linuxjournal.com/article/6735
by Jeff Tranter. on September 30, 2004. ALSA stands for the Advanced Linux Sound Architecture. It consists of a set of kernel drivers, an application programming interface (API) library and utility programs for supporting sound under Linux. In this article, I present a brief overview of the ALSA Project and its software components.
python - Open audio with callback using ALSA - Stack …
https://stackoverflow.com/questions/28999267/open-audio-with-callback-using-alsa
Show activity on this post. Is it possible in Python, using ALSA, to access the audio hardware for playback, with a callback function: def audiocallback (): # create some audio and return a buffer of 1024 samples (~23 ms @ 44.1khz) # that is going to be played on the device return buffer openaudio (deviceid=1, type=OUTPUT, freq=44100, buffersize=1024, callback = audiocallback)
ALSA PCM Timestamping — The Linux Kernel …
https://www.kernel.org/doc/html/latest/sound/designs/timestamping.html
ALSA PCM Timestamping. The ALSA API can provide two different system timestamps: Trigger_tstamp is the system time snapshot taken when the .trigger callback is invoked. This snapshot is taken by the ALSA core in the general case, but specific hardware may have synchronization capabilities or conversely may only be able to provide a correct ...
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