Enable spdif-out #6
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Since your patch for rockpis-spdif-out is merged, I close this PR. Thanks. |
RadxaStephen
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Oct 27, 2022
This patch add support for DMA-based digital loopback.
BACKGROUND
Audio Products with AEC require loopback for echo cancellation.
the hardware LP is not always available on some products, maybe
the HW limitation(such as internal acodec) or HW Cost-down.
This patch add support software DLP for such products.
Enable:
CONFIG_SND_SOC_ROCKCHIP_DLP
&i2s {
rockchip,digital-loopback;
};
Mode List:
amixer contents
numid=2,iface=MIXER,name='Software Digital Loopback Mode'
; type=ENUMERATED,access=rw------,values=1,items=7
; Item #0 'Disabled'
; Item #1 '2CH: 1 Loopback + 1 Mic'
; Item #2 '2CH: 1 Mic + 1 Loopback'
; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
; Item #4 '2CH: 2 Loopbacks'
; Item #5 '4CH: 2 Mics + 2 Loopbacks'
; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
: values=0
Testenv:
wired SDO0 --> SDI0 directly to get external digital loopback
as reference.
Testcase: dlp.sh
/#!/bin/sh
item=0
id=`amixer contents | grep "Software Digital Loopback" | \
awk -F ',' '{print $1}'`
items=`amixer contents | grep -A 1 "Software Digital Loopback" | \
grep items | awk -F 'items=' '{print $2}'`
echo "Software Digital Loopback: $id, items: $items"
mode_chs() {
case $1 in
[0-4])
echo "2"
;;
[5-6])
echo "4"
;;
*)
echo "2"
;;
esac
}
while true
do
ch=`mode_chs $item`
amixer -c 0 cset $id $item
arecord -D hw:0,0 --period-size=1024 --buffer-size=4096 -r 48000 -c $ch -f s16_le \
-d 15 sine/dlp_$item.wav &
sleep 2
for i in $(seq 1 10)
do
aplay -D hw:0,0 --period-size=1024 --buffer-size=8192 $((ch))ch.wav -d 1
done
pid=$(ps | egrep "aplay|arecord" | grep -v grep | awk '{print $1}' | sort -r)
for p in $pid
do
wait $p 2>/dev/null
done
item=$((item+1))
if [ $item -ge $items ]; then
sleep 1
break
fi
done
echo "Done"
Result:
do shell test and verify dlp_x.wav:
* Alignment: ~1 samples shift (loopback <-> mics).
* Integrity: no giltch, no data lost.
* AEC: align loopback and mics sample and do simple AEC, get clean
waveform.
Logs:
...
numid=2,iface=MIXER,name='Software Digital Loopback Mode'
; type=ENUMERATED,access=rw------,values=1,items=7
; Item #0 'Disabled'
; Item #1 '2CH: 1 Loopback + 1 Mic'
; Item #2 '2CH: 1 Mic + 1 Loopback'
; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
; Item #4 '2CH: 2 Loopbacks'
; Item #5 '4CH: 2 Mics + 2 Loopbacks'
; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
: values=2
Recording WAVE 'sine/dlp_2.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
...
numid=2,iface=MIXER,name='Software Digital Loopback Mode'
; type=ENUMERATED,access=rw------,values=1,items=7
; Item #0 'Disabled'
; Item #1 '2CH: 1 Loopback + 1 Mic'
; Item #2 '2CH: 1 Mic + 1 Loopback'
; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
; Item #4 '2CH: 2 Loopbacks'
; Item #5 '4CH: 2 Mics + 2 Loopbacks'
; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
: values=6
Recording WAVE 'sine/dlp_6.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Done
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: I5772f0694f7a14a0f0bd1f0777b6c4cdbd781a64
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