Triode wrote:
> I think Clive is already using sox to upsample to 384 on the server.
> Clive - does this work in real time if the server is on the wandboard?
One word answer, yes. You'll be using one proc core exclusively for the
up/over sampling 44k1->352k8 or 48k -> 384k.
Example below with my server side sox re-sampling on the WB, 44k1 ->
352k8, very high quality, minimum phase.
I have several other thoughts about going down this path. I'll send you
an email this evening.
Code:
--------------------
##
## HDCDUpsample
##
flc flc * 00:1f:7b:b2:02:85
# FT:{START=--skip=%t}U:{END=--until=%v}D:{RESAMPLE=-r %d}
[flac] -dcs $START$ $END$ -- $FILE$ | [HDCDUpsample.sh] --file=$FILE$ -W
--oversample="8" --max-sample-rate="384000" --sox-general-opt="-q"
--sox-input-opt="-t wav -" --sox-output-opt="-t flac -C0 -b24 -D -"
--sox-effect-opt="gain -1 rate -v -s -M"
--------------------
Code:
--------------------
top - 05:35:39 up 1 day, 3:52, 2 users, load average: 4.42, 3.90, 3.57
Tasks: 112 total, 2 running, 110 sleeping, 0 stopped, 0 zombie
%Cpu0 : 78.8 us, 1.7 sy, 0.0 ni, 18.8 id, 0.0 wa, 0.0 hi, 0.7 si, 0.0
st
%Cpu1 : 37.1 us, 1.7 sy, 0.0 ni, 60.9 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0
st
KiB Mem: 848036 total, 832216 used, 15820 free, 32104 buffers
KiB Swap: 0 total, 0 used, 0 free, 524716 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
25414 squeezeb 20 0 15472 6680 2244 R 92.5 0.8 0:54.41 sox
25390 squeezeb 20 0 92948 80m 5188 S 16.2 9.8 0:32.92 squeezeboxserve
25330 squeezel 10 -10 12280 9692 3604 S 7.6 1.1 0:05.38 squeezelite
25404 squeezeb 20 0 553m 16m 5668 S 2.4 2.0 0:03.25 java
25402 squeezeb 20 0 7776 824 636 S 1.3 0.1 0:00.77 flac
--------------------
Code:
--------------------
[fedora@wandboard squeezeboxserver]$ less /var/log/squeezeboxserver/HDCD.log
2013-05-29 05:34:37,274 INFO (main) [HDCD] [] HDCD Version: 20130306
2013-05-29 05:34:37,308 WARN (main) [HDCD] [] hdcd.exe is not found!
2013-05-29 05:34:37,317 INFO (main) [HDCD] [] HDCDUpsample
--file=/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac -W
--oversample=8 --max-sample-rate=384000 --sox-general-opt=-q --sox-input-opt=-t
wav - --sox-output-opt=-t flac -C0 -b24 -D - --sox-effect-opt=gain -1 rate -v
-s -M
2013-05-29 05:34:37,423 INFO (main) [HDCD] [] --async-rate not set.
2013-05-29 05:34:37,594 DEBUG (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Sample Rate:
44100, BPS: 16, Channels: 2
2013-05-29 05:34:37,596 DEBUG (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Requested
Oversample Ratio: 8, Requested Output Rate: 352800, Max Output Rate: 384000,
Actual Output Rate: 352800
2013-05-29 05:34:37,665 DEBUG (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Starting
without checking for HDCD encoding. --without-hdcd cmdline argument given!
2013-05-29 05:34:37,775 DEBUG (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Pass through,
not decoding. (STDIN -> sox -q -t wav - -t flac -C0 -b24 -D - gain -1 rate -v
-s -M 352800)
2013-05-29 05:41:50,348 DEBUG (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Cleaning Up
2013-05-29 05:41:50,349 INFO (main) [HDCD]
[/storage/music/lossless/June_Tabor/Ashore/01 - Finisterre.flac] Finished
--------------------
Code:
--------------------
[fedora@wandboard squeezeboxserver]$
/usr/share/squeezeboxserver/Bin/HDCDUpsample.sh --help
usage: HDCDUpsample [--file <NAME>] [--fis <NAME>] [--fos <NAME>] [-h]
[--max-sample-rate <RATE>] [--oversample <RATIO>] [--sox-effect-opt
<EFFECT_OPTS>] [--sox-gain-db <DB_GAIN>] [--sox-gain-db-hdcd
<DB_GAIN>] [--sox-general-opt <GENERAL_OPTS>] [--sox-input-opt
<INPUT_OPTS>] [--sox-output-opt <OUTPUT_OPTS>] [-W] [-X]
--file <NAME> the file to be processed.
--fis <NAME> the file input stream.
--fos <NAME> the file output stream.
-h,--help Show help.
--max-sample-rate <RATE> The maximum sample rate supported
by the output device. Defaults to
"96000" if not specified.
--oversample <RATIO> The oversample ratio. ie. RATIO *
sample_rate = output_sample_rate.
Defaults to "1" if not specified.
--sox-effect-opt <EFFECT_OPTS> The effect options to be passed to
sox. Defaults to "rate -v -s -L" if
not specified.
--sox-gain-db <DB_GAIN> The gain (in db) to be applied by
sox (before resampling) when not
decoding hdcd. NB. Ignored when
output sample rate == input sample
rate. ie. when not resampling.
--sox-gain-db-hdcd <DB_GAIN> The gain (in db) to be applied by
sox (before resampling) when
decoding hdcd.
--sox-general-opt <GENERAL_OPTS> The general options to be passed to
sox. Defaults to "-q" if not
specified.
--sox-input-opt <INPUT_OPTS> The input options to be passed to
sox. Defaults to "-t wav -" if not
specified.
--sox-output-opt <OUTPUT_OPTS> The output options to be passed to
sox. Defaults to "-t flac -C0 -b24
-D -" if not specified.
-W,--without-hdcd Disable HDCD decoding.
-X,--async-rate Switch off the requirement that
output rate should be an integer
multiple/divisor of the original
rate.
--------------------
------------------------------------------------------------------------
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