How to read a raw signal from a microphone?
Linux Ubuntu 18.04
I'm trying to get the raw signal from a microphone as byte sequence and do some signal processing by myself. My first thought was actually just to find a device in the /dev directory, open file descriptor and start reading from it. But I discovered that there is audio library ALSA which I think does not really provide the ability to read a raw signal from the microphone.
So I found the /dev/snd directory and got confused. Here is how it looks like on my machine:
/dev/snd$ tree
.
├── by-path
│ ├── pci-0000:00:03.0 -> ../controlC0
│ └── pci-0000:00:1b.0 -> ../controlC1
├── controlC0
├── controlC1
├── hwC0D0
├── hwC1D0
├── pcmC0D3p
├── pcmC0D7p
├── pcmC0D8p
├── pcmC1D0c
├── pcmC1D0p
├── pcmC1D1p
├── pcmC1D2c
├── seq
└── timer
How to determine what is the microphone here?
c linux audio
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
add a comment |
Linux Ubuntu 18.04
I'm trying to get the raw signal from a microphone as byte sequence and do some signal processing by myself. My first thought was actually just to find a device in the /dev directory, open file descriptor and start reading from it. But I discovered that there is audio library ALSA which I think does not really provide the ability to read a raw signal from the microphone.
So I found the /dev/snd directory and got confused. Here is how it looks like on my machine:
/dev/snd$ tree
.
├── by-path
│ ├── pci-0000:00:03.0 -> ../controlC0
│ └── pci-0000:00:1b.0 -> ../controlC1
├── controlC0
├── controlC1
├── hwC0D0
├── hwC1D0
├── pcmC0D3p
├── pcmC0D7p
├── pcmC0D8p
├── pcmC1D0c
├── pcmC1D0p
├── pcmC1D1p
├── pcmC1D2c
├── seq
└── timer
How to determine what is the microphone here?
c linux audio
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
4
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices withO_RDONLYflag but continiously gettingEBADFerrno. It would be great if you can advice where to start with to learn how to work with devices directly onLinux?
– Some Name
Nov 14 '18 at 8:14
add a comment |
Linux Ubuntu 18.04
I'm trying to get the raw signal from a microphone as byte sequence and do some signal processing by myself. My first thought was actually just to find a device in the /dev directory, open file descriptor and start reading from it. But I discovered that there is audio library ALSA which I think does not really provide the ability to read a raw signal from the microphone.
So I found the /dev/snd directory and got confused. Here is how it looks like on my machine:
/dev/snd$ tree
.
├── by-path
│ ├── pci-0000:00:03.0 -> ../controlC0
│ └── pci-0000:00:1b.0 -> ../controlC1
├── controlC0
├── controlC1
├── hwC0D0
├── hwC1D0
├── pcmC0D3p
├── pcmC0D7p
├── pcmC0D8p
├── pcmC1D0c
├── pcmC1D0p
├── pcmC1D1p
├── pcmC1D2c
├── seq
└── timer
How to determine what is the microphone here?
c linux audio
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
Linux Ubuntu 18.04
I'm trying to get the raw signal from a microphone as byte sequence and do some signal processing by myself. My first thought was actually just to find a device in the /dev directory, open file descriptor and start reading from it. But I discovered that there is audio library ALSA which I think does not really provide the ability to read a raw signal from the microphone.
So I found the /dev/snd directory and got confused. Here is how it looks like on my machine:
/dev/snd$ tree
.
├── by-path
│ ├── pci-0000:00:03.0 -> ../controlC0
│ └── pci-0000:00:1b.0 -> ../controlC1
├── controlC0
├── controlC1
├── hwC0D0
├── hwC1D0
├── pcmC0D3p
├── pcmC0D7p
├── pcmC0D8p
├── pcmC1D0c
├── pcmC1D0p
├── pcmC1D1p
├── pcmC1D2c
├── seq
└── timer
How to determine what is the microphone here?
c linux audio
c linux audio
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
asked Nov 14 '18 at 7:41
Some NameSome Name
1,097416
1,097416
4
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices withO_RDONLYflag but continiously gettingEBADFerrno. It would be great if you can advice where to start with to learn how to work with devices directly onLinux?
– Some Name
Nov 14 '18 at 8:14
add a comment |
4
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices withO_RDONLYflag but continiously gettingEBADFerrno. It would be great if you can advice where to start with to learn how to work with devices directly onLinux?
– Some Name
Nov 14 '18 at 8:14
4
4
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices with
O_RDONLY flag but continiously getting EBADF errno. It would be great if you can advice where to start with to learn how to work with devices directly on Linux?– Some Name
Nov 14 '18 at 8:14
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices with
O_RDONLY flag but continiously getting EBADF errno. It would be great if you can advice where to start with to learn how to work with devices directly on Linux?– Some Name
Nov 14 '18 at 8:14
add a comment |
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4
There should be many good libraries and frameworks which can help you find a suitable input device at run-time, and then let you open and read the raw data from that device. I suggest you try to find such a library or framework instead of attempting to access the device directly.
– Some programmer dude
Nov 14 '18 at 7:47
@Someprogrammerdude I'm doing this for learning purpose. So working with a sound card directly is one of my interest. I tried to open some devices with
O_RDONLYflag but continiously gettingEBADFerrno. It would be great if you can advice where to start with to learn how to work with devices directly onLinux?– Some Name
Nov 14 '18 at 8:14