File Plugin seems to drop data when writing to FIFO

[GitHub issues - opened]

alsa-project/alsa-lib issue #63 was opened from riggiding:

Hi,

we're using the file plugin to pipe data for use in a vu-meter application. This worked well but since updating to 1.1.4.1 the data received is incomplete (tested using sine test tones and Audacity to playback / inspect the data that went through the fifo).
**When writing to a normal file all is fine.**

Also tried using tee, same result.
Any hints or ideas would be great!

**The fifo is created by:**
#! /bin/sh

if [ ! -p "$ALSA_FIFO" ]; then
	# create a fifo for alsa -> vumeter
	mkfifo "$ALSA_FIFO"                                           
	chmod 666 "$ALSA_FIFO"
fi

cat <>"$ALSA_FIFO"

**asound.conf:**

pcm.hiface {
	type hw
	card 0
	device 0
}

pcm.vumeter {
	type rate
	slave {
		pcm "alsaFifo"
		rate 44100
		format "S16_LE"
	}
}

pcm.alsaFifo {
	type file
	slave.pcm "null"
	file "/tmp/alsa-fifo"
}

pcm.alsaFifoTee {
       type empty
       slave.pcm "tee:null,'/tmp/alsa-fifo',raw"
}

pcm.direct {
	type route
	slave.pcm "split_direct"
	ttable.0.0 1
	ttable.1.1 1
	ttable.0.2 1
	ttable.1.3 1
}

pcm.split_direct {
	type multi
	slaves.a.pcm "hiface"
	slaves.a.channels 2
	slaves.b.pcm "vumeter"
	slaves.b.channels 2
	bindings.0.slave a
	bindings.0.channel 0
	bindings.1.slave a
	bindings.1.channel 1
	bindings.2.slave b
	bindings.2.channel 0
	bindings.3.slave b
	bindings.3.channel 1
}

Issue URL     : https://github.com/alsa-project/alsa-lib/issues/63
Repository URL: https://github.com/alsa-project/alsa-lib