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Is there a method to figure out the audio channel layout in Linux?


Is there a method to figure out the audio channel layout in Linux?

By : user2956824
Date : November 22 2020, 03:03 PM
I hope this helps you . In ALSA, the default device typically supports only stereo. You can try to open a device named front, surround40, surround51, or surround71, but these devices do not have automatic sample format conversion or software mixing.
The best idea would be to use PulseAudio, and to ask the server for the channel map of the sink.
code :


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How to get the audio channel layout string from CMAudioFormatDescription?

How to get the audio channel layout string from CMAudioFormatDescription?


By : hotbrain0023
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can use the properties kAudioFormatProperty_ChannelLayoutName and kAudioFormatProperty_ChannelLayoutSimpleName with AudioFormatGetProperty to get what you're after:
code :
CFStringRef layoutName = nullptr;
UInt32 propertySize = sizeof(layoutName);
OSStatus result = AudioFormatGetProperty(kAudioFormatProperty_ChannelLayoutName, /* size of your channel layout */, /* your channel layout */, &propertySize, &layoutName);

// later
CFRelease(layoutName);
channel layout of audio

channel layout of audio


By : Zulander
Date : March 29 2020, 07:55 AM
this will help I have some question hoping you to answer.
code :
mono audio is one channel
stereo 2 channel
... additional channels are also accommodated
two bytes ch a
two bytes ch b
two bytes ch a
two bytes ch b
Converting a stereo channel audio file to left channel only, through command line

Converting a stereo channel audio file to left channel only, through command line


By : lex
Date : March 29 2020, 07:55 AM
I wish did fix the issue. SoX lets you do this very easily.
The first case, muted right channel:
code :
sox test.mp3 test-rmuted.mp3 remix 1 0
sox test.mp3 test-lmono.mp3 remix 1,2 0
for f in *.mp3
do
  basename="${f%.*}"
  echo "$basename"
  sox "$f" -t wav - remix 1 0 | \
    lame --preset standard - "00-${basename}-rmute".mp3
done
for f in *.mp3
do
  basename="${f%.*}"
  echo "$basename"
  sox "$f" -t wav - remix 1,2 0 | \
    lame --preset standard - "00-${basename}-lmono".mp3
done
Using FFMPEG to split a 16 channel audio input source into 4 seperate 4 channel audio feeds for streaming

Using FFMPEG to split a 16 channel audio input source into 4 seperate 4 channel audio feeds for streaming


By : user3541051
Date : March 29 2020, 07:55 AM
around this issue I hope someone can help
code :
ffmpeg -f dshow -channels 16 -i audio="Dante Via Receive (Dante Via)" -filter_complex "[0:a]channelmap=0|1|2|3[1-4];[0:a]channelmap=4|5|6|7[5-8];[0:a]channelmap=8|9|10|11[9-12];[0:a]channelmap=12|13|14|15[13-16]" -map "[1-4]" 1-4.wav -map "[5-8]" 5-8.wav -map "[9-12]" 9-12.wav -map "[13-16]" 13-16.wav
How to get an exact audio channel layout info by ffmpeg?

How to get an exact audio channel layout info by ffmpeg?


By : D.C.
Date : March 29 2020, 07:55 AM
I hope this helps . A roundabout method is to use ffprobe to get the numerical channel layout:
code :
$ ffprobe -v error -show_entries stream=channel_layout -of csv=p=0 input.wav
  5.1
$ ffmpeg -v error -layouts | awk '/5.1 /{print $2}'
  FL+FR+FC+LFE+BL+BR
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