Triode,
If I try to play my 32kHz sampled WAV file via LMS to squeezelite with
the following settings..
Code:
--------------------
# Updated by Community Squeeze web-gui at 2013/12/14 20:18:35 GMT
NAME="-n SqueezeliteQUAD"
MAX_RATE="-r 192000"
AUDIO_DEV="-o hw:CARD=UD501"
LOG_FILE="-f /var/log/squeezelite/squeezelite.log"
LOG_LEVEL="-d output=debug"
ALSA_PARAMS="-a 40:::"
UPSAMPLE="-u hLs"
--------------------
...it plays on my DAC at 384,000 Hz and sounds okay. However, this
should not be happening since I have specified -r 192000.
In such a case, the debug log looks as follows:
Code:
--------------------
[20:29:09.290465] output_init_alsa:611 init output
[20:29:09.291077] output_init_common:316 outputbuf size: 14112000
[20:29:09.291316] output_init_alsa:634 requested alsa_buffer: 40 alsa_period:
4 format: any mmap: 1
[20:29:09.291399] output_init_alsa:648 output: hw:CARD=UD501 maxrate: 192000
[20:29:09.439071] output_init_alsa:656 memory locked
[20:29:09.440326] output_init_alsa:679 set output sched fifo rt: 45
[20:29:09.446060] output_thread:464 open output device: hw:CARD=UD501
[20:29:09.446750] alsa_open:233 opened device hw:CARD=UD501 using format:
S32_LE sample rate: 44100 mmap: 1
[20:29:09.446948] alsa_open:312 buffer: 40 period: 4 -> buffer size: 1764
period size: 441
[20:29:09.449949] ALSA snd_pcm_hw_start:588 SNDRV_PCM_IOCTL_START failed (-32)
[20:29:09.466237] output_flush:356 flush output buffer
[20:29:09.469313] output_flush:356 flush output buffer
[20:29:17.839823] output_flush:356 flush output buffer
[20:29:18.288333] _output_frames:59 start buffer frames: 37632
[20:29:18.288662] _output_frames:122 track start sample rate: 128000
replay_gain: 0
[20:29:18.288756] output_thread:464 open output device: hw:CARD=UD501
[20:29:18.297939] alsa_open:212 reopening device hw:CARD=UD501 in plug mode
as plughw:CARD=UD501 for resampling
[20:29:18.300059] alsa_open:233 opened device plughw:CARD=UD501 using format:
S32_LE sample rate: 128000 mmap: 1
[20:29:18.300695] alsa_open:312 buffer: 40 period: 4 -> buffer size: 5120
period size: 1280
--------------------
I notice that squeezelite is reopening the device in plug mode for
resampling even though there is a synchronous sample rate that is within
the range of the DAC (192,000). Why is this?
I also notice the 128kHz sampling rate, which admittedly isn't supported
by the DAC, seems to have been tried, then discarded, but instead of
going back to the native 32kHz sampling rate when reopening in plug
mode, it preserves that new sampling rate when asking the ALSA pluhgw to
take over. Is this intentional or a bug? Anyway, the net result is that
the ALSA plug mode upsamples by 3 after squeezelite has upsampled by 4.
This gives a total up sampling factor of 12, whereas I might have
expected squeezelite to choose 6 directly.
Is it possible this is related to my other problem?
----------------------
"Dreamer, easy in the chair that really fits you..."
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View this thread: http://forums.slimdevices.com/showthread.php?t=99395
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