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Get audio samples sent to a sound card

Changing default audio device in PulseaudioCommand line audio - piping for simultaneous playback and recordingWhy do you need PulseAudio?alsa sound module snd_aloopALSA: send audio to two audio devices8 independants mono channel on 7.1 sound card, but possibility to play sound on 8 channels simultaneouslyDebian Audio Issue

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I need to get the actual audio samples sent to a specific sound card. Currently I'm using a Debian distro with Alsa. My searches failed, perhaps due to wrong keywords.

I don't want to record the audio, I just need the samples in real time accessible from my application (best is C++, but also Python is ok). Steal the output from the target sound card is also acceptable if it's not possible to get samples at the same time they are sent to it.

If you need other information please tell me in the comments.

debian audio alsa

share|improve this question

asked 1 hour ago

MarkMark

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0

I need to get the actual audio samples sent to a specific sound card. Currently I'm using a Debian distro with Alsa. My searches failed, perhaps due to wrong keywords.

I don't want to record the audio, I just need the samples in real time accessible from my application (best is C++, but also Python is ok). Steal the output from the target sound card is also acceptable if it's not possible to get samples at the same time they are sent to it.

If you need other information please tell me in the comments.

debian audio alsa

share|improve this question

asked 1 hour ago

MarkMark

1551313 bronze badges

add a comment | 

I need to get the actual audio samples sent to a specific sound card. Currently I'm using a Debian distro with Alsa. My searches failed, perhaps due to wrong keywords.

I don't want to record the audio, I just need the samples in real time accessible from my application (best is C++, but also Python is ok). Steal the output from the target sound card is also acceptable if it's not possible to get samples at the same time they are sent to it.

If you need other information please tell me in the comments.

debian audio alsa

share|improve this question

asked 1 hour ago

MarkMark

1551313 bronze badges

share|improve this question

asked 1 hour ago

MarkMark

1551313 bronze badges

share|improve this question

asked 1 hour ago

MarkMark

1551313 bronze badges

asked 1 hour ago

MarkMark

1551313 bronze badges

asked 1 hour ago

MarkMark

1551313 bronze badges

1 Answer
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"Recording" and "accessing the samples in real time" are basically the same thing.

Debian has Pulseaudio enabled by default, so the simplest way is to record (or "access the samples") from the associated .monitor source of the Pulseaudio sink of your soundcard. This will work out of the box.

From the Pulseaudio sink, the samples go through ALSA and are then sent to the card, so there's a slight delay. But the samples will be the exact samples sent.

There are probably other ways to do that, but all of them are a lot more complicated, and some depend on the type of soundcard you have.

With respect to delay, you should also keep in mind that "accessing the samples" will involve buffering, so there will be a delay, no matter what you do.

If you have more specific requirements, please explain your use case in more detail.

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answered 32 mins ago

dirktdirkt

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0

"Recording" and "accessing the samples in real time" are basically the same thing.

Debian has Pulseaudio enabled by default, so the simplest way is to record (or "access the samples") from the associated .monitor source of the Pulseaudio sink of your soundcard. This will work out of the box.

From the Pulseaudio sink, the samples go through ALSA and are then sent to the card, so there's a slight delay. But the samples will be the exact samples sent.

There are probably other ways to do that, but all of them are a lot more complicated, and some depend on the type of soundcard you have.

With respect to delay, you should also keep in mind that "accessing the samples" will involve buffering, so there will be a delay, no matter what you do.

If you have more specific requirements, please explain your use case in more detail.

share|improve this answer

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges

add a comment | 

0

"Recording" and "accessing the samples in real time" are basically the same thing.

Debian has Pulseaudio enabled by default, so the simplest way is to record (or "access the samples") from the associated .monitor source of the Pulseaudio sink of your soundcard. This will work out of the box.

From the Pulseaudio sink, the samples go through ALSA and are then sent to the card, so there's a slight delay. But the samples will be the exact samples sent.

There are probably other ways to do that, but all of them are a lot more complicated, and some depend on the type of soundcard you have.

With respect to delay, you should also keep in mind that "accessing the samples" will involve buffering, so there will be a delay, no matter what you do.

If you have more specific requirements, please explain your use case in more detail.

share|improve this answer

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges

add a comment | 

"Recording" and "accessing the samples in real time" are basically the same thing.

Debian has Pulseaudio enabled by default, so the simplest way is to record (or "access the samples") from the associated .monitor source of the Pulseaudio sink of your soundcard. This will work out of the box.

From the Pulseaudio sink, the samples go through ALSA and are then sent to the card, so there's a slight delay. But the samples will be the exact samples sent.

There are probably other ways to do that, but all of them are a lot more complicated, and some depend on the type of soundcard you have.

With respect to delay, you should also keep in mind that "accessing the samples" will involve buffering, so there will be a delay, no matter what you do.

If you have more specific requirements, please explain your use case in more detail.

share|improve this answer

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges

share|improve this answer

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges

answered 32 mins ago

dirktdirkt

19k33 gold badges1515 silver badges3939 bronze badges