Greetings Eric, I'm part of a small group that is interested in DSP using ARMhf boards like RPi and BBB. Sox has been a great tool for simpler tasks, but now I would like to try the objective of the original poster, Charlie. I'm using SoX to process a stream from a 2-channel ALSA 'recording' source and send filtered output to a different 2-channel ALSA plug. ...it works great like this: sox --buffer 1024 -r 48000 -c 2 -t alsa hw:1,0 -t alsa plug:filter1 gain -h fir /usr/filter/fir2peak48mild.txt This also works with LADSPA filters like this: sox --buffer 1024 -r 48000 -c 2 -t alsa hw:1,0 -t alsa plug:filter1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0 However, I'm stuck when I try to split clone the streaming source using the syntax in your message: Eric Wong wrote > sox -M \ > "|sox i.wav -p remix 1v1 highpass $XO highpass $XO $HI_FX1" \ > "|sox i.wav -p remix 1v1 lowpass $XO lowpass $XO $LO_FX1" \ > "|sox i.wav -p remix 2v1 highpass $XO highpass $XO $HI_FX2" \ > "|sox i.wav -p remix 2v1 lowpass $XO lowpass $XO $LO_FX2" \ > output.wav \ > remix -m 1,2 3,4 Inserted into the above, this: “|sox -t alsa hw:1,0 -p remix 1v1 ladspa ACDf 21 1 0 240 0.707 0 0 ladspa ACDf 21 1 0 240 0.707 0 0” \ produces three of these alerts: "sox FAIL formats: can't open input `hw:1,0': snd_pcm_open error: Device or resource busy" Other attempts to specify and clone the inputs all failed as well: "sox FAIL sox: Not enough input filenames specified" If you have any advice on getting SoX to clone an ALSA streaming source (e.g., a stereo signal from 'hw:1,0') for input into multiple effect chains, it would be much appreciated. As well, any additional advice in correctly defining each sub-stream for ALSA output would undoubtedly help. Output could go via hardware (hw:0,0), or via user space into an ALSA plug. Either way, SoX offers advantages in the ability to combine a multitude of useful effects. [Think: a digital-level "miniDSP" using a RPi...] We just need to better understand channel creation and management for continuous streaming. Many thanks in advance! Frank -- View this message in context: http://sox.10957.n7.nabble.com/implementing-loudspeaker-crossovers-using-Sox-LADSPA-plugins-tp5464p5712.html Sent from the SoX mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Sox-users mailing list Sox-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/sox-users
