Quote from: logicom on 2013-11-06 18:10:05

Despite of your other skills,  phofman I award you with PhD in Linux

I hope you won't be offended if I correct your English, but I think you meant "In addition to your other skills".

cat /proc/asound/card0/pcm0p/sub0/hw_params

The current stream parameters entering your soundcard are listed in the virtual interface to your drivers in /proc.

#!/bin/bash

if [ "$1" = '-h' -o "$1" = '--help' ]; then
	me="${0##*/}"
	echo "$me: list ALSA devices and relevant information."
	exit 0
fi

if [ -e '/proc/asound/version' ]; then
	cat '/proc/asound/version'
	echo
fi

for (( i=0; i<100; i++ )); do
	if [ -d "/proc/asound/card${i}" ]; then
		cname="$( cat "/proc/asound/card${i}/id" )"
		echo "Card ${i} (${cname}):"

		for t in 'p' 'c'; do
			case "$t" in
				p) typeString='Playback' ;;
				c) typeString='Recording' ;;
			esac

			for (( j=0; j<100; j++ )); do
				if [ -d "/proc/asound/card${i}/pcm${j}${t}" ]; then
					dname=''
					if [ -e "/proc/asound/card${i}/pcm${j}${t}/info" ]; then
						dname="$( grep -E '^name: ' "/proc/asound/card${i}/pcm${j}${t}/info" 2>/dev/null | cut -d ' ' -f 2- )"
					fi
					echo
					if [ -n "$dname" ]; then
						echo "  * ${typeString} Device ${j} (${dname}):"
					else
						echo "  * ${typeString} Device ${j}:"
					fi
					ownerPID="$( grep -E '^owner_pid' "/proc/asound/card${i}/pcm${j}${t}/sub0/status" 2>/dev/null | tr -cd '0-9' )"
					if [ -n "$ownerPID" ]; then
						tgid="$( grep -F 'Tgid:' "/proc/${ownerPID}/status" 2>/dev/null | tr -cd '0-9' )"
						if [ -n "$tgid" ]; then
							ownerPID="$tgid"
						fi
						ownerName="$( cat "/proc/${ownerPID}/comm" 2>/dev/null )"
						echo "    used by: ${ownerName} (PID ${ownerPID})"
					fi
					while read line; do
						echo "    $line"
					done < "/proc/asound/card${i}/pcm${j}${t}/sub0/hw_params"
				fi
			done
		done
		echo
	fi
done

Advanced Linux Sound Architecture Driver Version k3.11.6-1-ARCH.

Card 0 (PCH):

  * Playback Device 0 (ALC663 Analog):
    used by: chromium (PID 6819)
    access: MMAP_INTERLEAVED
    format: S32_LE
    subformat: STD
    channels: 2
    rate: 44100 (44100/1)
    period_size: 5513
    buffer_size: 16539

  * Playback Device 1 (ALC663 Digital):
    closed

  * Recording Device 0 (ALC663 Analog):
    closed

Card 1 (USB):

  * Playback Device 0 (USB Audio):
    used by: jackd (PID 609)
    access: MMAP_INTERLEAVED
    format: S24_3LE
    subformat: STD
    channels: 2
    rate: 44100 (44100/1)
    period_size: 512
    buffer_size: 1536

  * Recording Device 0 (USB Audio):
    closed

Wasn't reading hardware info from the process filesystem deprecated like 10 years ago in favor of sysfs?

PulseAudio?
See /etc/pulse/daemon.conf options default-sample-format and default-sample-rate.

resample-method = speex-float-1
; default-sample-format = s16le
; default-sample-rate = 192000
; alternate-sample-rate = 192000
; default-sample-channels = 2
; default-channel-map = front-left,front-right

How did you determine your playback part was resampling? The current stream parameters entering your soundcard are listed in the virtual interface to your drivers in /proc. For device 0.0.0 that would be

Code: [Select]

cat /proc/asound/card0/pcm0p/sub0/hw_params

The alsa device specifed in sox "plughw:0" resamples only if your soundcard cannot natively play the requested samplerate. No pulseaudio is involved. PA would open (acquire) the soundcard, making it unavailable to sox. As a result sox would throw the "device busy" error message you have already encountered.

Linux audio is no black box, you just need to learn how it works. Unlike proprietary solutions which only their authors know what they actually do.

logicom, obviously you're supposed to run that script while playing something, i.e. while your soundcard is being used. It appears that your soundcard is set to 16 bit, 48kHz, stereo.

That doesn't look like the Asus Xonar D1. It looks more like the Ensoniq Audio PCI, which is very old, and only supports 48 kHz. Did you run the script on the same PC where your Xonar sound card is installed?

Advanced Linux Sound Architecture Driver Version k3.11.0-12-generic.

Card 0 (D1):

 * Playback Device 0 (Multichannel):
 used by: alsa-sink-Multi (PID 3615)
 access: MMAP_INTERLEAVED
 format: S16_LE
 subformat: STD
 channels: 2
 rate: 48000 (48000/1)
 period_size: 88200
 buffer_size: 88200

 * Playback Device 1 (Digital):
 closed

 * Recording Device 0 (Multichannel):
 closed

 * Recording Device 1 (Digital):
 closed

defaults.pcm.rate_converter "samplerate_best"
#defaults.pcm.rate_converter "samplerate_medium"
#defaults.pcm.rate_converter "samplerate"

pcm.!default "plugXonar"
ctl.!default "plugXonar"

pcm.xonar {
    type hw
    card D1
    device 0
    format S16_LE
    rate 192000
}

ctl.xonar {
    type hw
    card D1
}

pcm.plugXonar { type plug; slave.pcm "xonar"; }
ctl.plugXonar { type hw; card D1; }

I do not think that will help. Logicom's sox uses plughw:xx directly.

https://lkml.org/lkml/2013/1/8/549

I completely removed pulseaudio, (I did that before as per suggestion by phofman on real host with xonar D1) and this is where I am. Playout is bad.