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Recording Audio | USB Audio Cards with a Raspberry Pi ...
https://learn.adafruit.com/usb-audio-cards-with-a-raspberry-pi/recording-audio#:~:text=Will%20record%20signed%2016-bit%20%28S16_LE%29%20audio%20at%2044100,you%20add%20to%20the%20-V%20mono%20command%20line.
Python Examples of alsaaudio.PCM_FORMAT_S16_LE
https://www.programcreek.com/python/example/91455/alsaaudio.PCM_FORMAT_S16_LE
The following are 8 code examples for showing how to use alsaaudio.PCM_FORMAT_S16_LE().These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.
c - Storing captured audio in PCM_FORMAT_S16_LE into …
https://stackoverflow.com/questions/22179261/storing-captured-audio-in-pcm-format-s16-le-into-a-char-buffer-and-converting-in
So I'm using alsa to capture audio from a microphone and eventually I want to process samples from each channel. This type of low level programming is quite new to me. However I'm a little confused, most of the examples using alsa store the samples for audio captured in format PCM_FORMAT_S16_LE in a char buffer.
Recording Audio | USB Audio Cards with a Raspberry Pi ...
https://learn.adafruit.com/usb-audio-cards-with-a-raspberry-pi/recording-audio
arecord --device=hw:1,0 --format S16_LE --rate 44100 -c1 test.wav Will record signed 16-bit ( S16_LE) audio at 44100 Hz ( --rate 44100) mono ( -c1) audio to test.wav. We've noted that any audio input will be echoed out the speakers as well You can have a little VU meter show up if you add to the -V mono command line. Press control-C to quit
audio types - FFmpeg
https://trac.ffmpeg.org/wiki/audio%20types
Sample Formats. Raw audio in FFmpeg can take several different "forms", i.e. sample formats. For instance: s means "signed" (for the integer representations), u would mean "unsigned" 16 means 16 Bits per sample le means "little endian" coding for the samples You can see a list of supported sample formats by inspecting the ffmpeg -formats output:
VC4 HDMI audio devices only support IEC958 formatted …
https://github.com/raspberrypi/linux/issues/4654
Would adding FORMAT_S16_LE support for the VC4 HDMI be something that you could do or is it possibly already somewhere in your TODO? It would also make VC4 HDMI audio devices use the same format as bcm2835-audio and various audio DACs use.
Tutorial: ALSA Tutorial 1 - Initialization | Sound Programming
https://soundprogramming.net/programming/alsa-tutorial-1-initialization/
Here we set our sample format to PCM 16-bit little-endian. If you are not using a little-endian (i.e. Intel or AMD) machine you will want to use a different setting. (err = snd_pcm_hw_params_set_format (_soundDevice, hw_params, SND_PCM_FORMAT_S16_LE) Here we set our stream to 2 channels (stereo):
arecord(1) - Linux man page
https://linux.die.net/man/1/arecord
The available format shortcuts are: -f cd (16 bit little endian, 44100, stereo) [-f S16_LE -c2 -r44100] -f cdr (16 bit big endian, 44100, stereo) [-f S16_BE -c2 -f44100] -f dat (16 bit little endian, 48000, stereo) [-f S16_LE -c2 -r48000] If no format is given U8 is used. -r, --rate=#<Hz> Sampling rate in Hertz. The default rate is 8000 Hertz.
ALSA - 简书
https://www.jianshu.com/p/596758696950
ALSA. ALSA (Advanced Linux Sound Architecture)，即高级Linux声音架构。. 在内核设备驱动层，ALSA提供了alsa-driver，同时在应用层，ALSA为我们提供了alsa-lib，应用程序只要调-用alsa-lib提供的API（libasound.so），即可以完成对底层音频硬件的控制。. 内核空间中，alsa-soc其实 …
A close look at ALSA
https://www.volkerschatz.com/noise/alsa.html
Parameter ranges remaining after these settings: 2..6 channels Sampling rate 32000..100000 Hz Sample formats: S16_LE Significant bits: 16 This is again an example using my Echoaudio sound card, which has restricted parameter values for mono playback.
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