Sample rate switcher for CamillaDSP

[TerryForsythe]

No. Using USB Gadget means using the USB-C port of your Raspberry Pi as a peripheral, the same port used to provide power. A splitter is therefore required to separate power from USB data. Moreover, a particular configuration is required. If I remember well, there are good "how to" guides on this forum. The USB gadget works fine as a capture device on a Raspberry Pi 4. I don't know if it works on a Raspberry Pi 5.

Also there is no such control defined in the alsa usb audio (host) driver source code.

I was going to get a USB-C splitter to try to use USB Gadget as explained by mevang. IIUC, I connect the MCHStreamer to the USB-C port to make this work, assuming the Pi 5 works as the Pi 4 does and I follow the "how to" guide.

 

[mevang]

This splitter worked for me:
https://www.aliexpress.com/item/1005003793429781.html?pdp_npi=4@dis!EUR!€ 7,11!€ 7,11!!!54.59!54.59!@211b805417111230831946984d6e62!12000027184842775!sh01!IT!875552785!&spm=a2g0o.store_pc_home.productList_2006535838311.1005003793429781

 

[TerryForsythe]

This splitter worked for me:
https://www.aliexpress.com/item/100...me.productList_2006535838311.1005003793429781

I just ordered one.

 

[HenrikEnquist]

IIUC, I connect the MCHStreamer to the USB-C port to make this work,

No, you don't use the mchstreamer at all in gadget mode. You connect the usb-c port of the pi directly to another computer, and the pi appears as a usb sound card on the other computer.

 

[TerryForsythe]

No, you don't use the mchstreamer at all in gadget mode. You connect the usb-c port of the pi directly to another computer, and the pi appears as a usb sound card on the other computer.

That won't work for me.

Oh well, with shipping the splitter was only $1.04.

Do you know of any way to get the sample rate change notification to camilladsp-setrate when using the mchstreamer kt for audio input and output?

I was planning on changing the firmware over to the SPDIF_Only firmware, but I'm not optimistic that will include any additional functionality over the TOSLINK_Only firmware other than changing the input location.

If not, I'll have to leave CamillaDSP at 44.1k. To be candid, I don't think I will be able to hear the difference between 192k (on songs streamed at that rate) and 44.1k. At least that is what my professor taught us when we covered Nyquist's theorem in our Circuits class.

 

[mevang]

A question from an alsa newbie:
- Why would the connection between a MCHStreamer (used as a USB audio player) and a RPi5 (used as a USB gadget capture device) not work?
(assuming the rpi5 supports gadget mode)

 

[phofman]

a MCHStreamer (used as a USB audio player)

Does MCHStreamer support USB host mode? I do not see any USB host connector. Also does XMOS support USB host mode? I have not heard about it yet.

IMO you mean USB device passing data to the host, USB capture. That is still a standard USB device, just the data are passed from the device to the host, every soundcard with analog/spdif input does that.

 

[HenrikEnquist]

When the rate changes the sound distorts.

I just stopped camilla.service, cleared camilladsp.log, and restarted the service. Then I played a song at 96k (played fine), then switched to a song recorded at 41k (played distorted). Then I stopped the service to keep the log short, relatively speaking. The log is attached.

I don't see any attachment, can you try again?

Do you know of any way to get the sample rate change notification to camilladsp-setrate when using the mchstreamer kt for audio input and output?

It's probably not possible, but depending on how the mchstreamer behaves when the rate change there may be a different way (not with camilladsp-setrate). That log would be interesting to see!

A question from an alsa newbie:
- Why would the connection between a MCHStreamer (used as a USB audio player) and a RPi5 (used as a USB gadget capture device) not work?
(assuming the rpi5 supports gadget mode)

The MCHStreamer has a misleading name! It's a fairly simple usb audio device with spdif i/o, and not any kind of audio player or streamer.

 

[TerryForsythe]

I don't see any attachment, can you try again?

The moderators must have pulled it down. Hopefully you see this before it gets pulled down again.

 

[TerryForsythe]

It's probably not possible, but depending on how the mchstreamer behaves when the rate change there may be a different way (not with camilladsp-setrate). That log would be interesting to see!

If there is a way, that would be Awesome!

The MCHStreamer has a misleading name! It's a fairly simple usb audio device with spdif i/o, and not any kind of audio player or streamer.

In the CamillaDSP Tutorial at the Audio Science Review forum the MCHStreamer is listed as one of the devices that has been used successfully with CamillaDSP. I have had good experience with other miniDSP products, so I went with it.

Once I get the connector assembled to connect RCA jacks to the SPDIF board I/O connector I am going to switch to the SPDIF_Only firmware and give that a try. Hopefully tonight, but maybe tomorrow - I need my son's crimping tool and, more importantly, his eyes to crimp the tiny pins onto the wires.

I doubt the firmware will change much other than changing the input port.

 

[TerryForsythe]

I don't see any attachment, can you try again?

The moderators must have pulled it down. Hopefully you see this before it gets pulled down again.

It's gone already. Even though I just ran long enough to play a high res song for a short duration, then switch to a low res song, the log is fairly long. This website won't let me paste the entire log. So, I'll try to remove redundant entries and paste unique entries in my next post. It will take a few minutes.

UPDATE: I posted parts of the log below. The blank lines are where I removed sections from the log that appeared redundant.

 

[TerryForsythe]

2024-03-22 16:37:40.802652 INFO [src/bin.rs:683] CamillaDSP version 2.0.3
2024-03-22 16:37:40.802673 INFO [src/bin.rs:684] Running on linux, aarch64
2024-03-22 16:37:40.802760 DEBUG [src/bin.rs:728] Loaded state: Some(State { config_path: Some("/home/tforsythe/camilladsp/configs/mchstreamer_96c_96p.yml"), mute: [false, false, false, false, false], volume: [0.0, 0.0, 0.0, 0.0, 0.0] })
2024-03-22 16:37:40.802777 DEBUG [src/bin.rs:735] Using statefile for initial volume
2024-03-22 16:37:40.802780 DEBUG [src/bin.rs:752] Using statefile for initial mute
2024-03-22 16:37:40.802783 DEBUG [src/bin.rs:765] Initial mute: [false, false, false, false, false]
2024-03-22 16:37:40.802786 DEBUG [src/bin.rs:766] Initial volume: [0.0, 0.0, 0.0, 0.0, 0.0]
2024-03-22 16:37:40.802789 DEBUG [src/bin.rs:768] Read config file None
2024-03-22 16:37:40.802792 DEBUG [src/bin.rs:800] No change to state from camilladsp/statefile.yml, not overwriting.
2024-03-22 16:37:40.803085 DEBUG [src/config.rs:1549] ../coeffs/LeftCH-96000.wav is relative
2024-03-22 16:37:40.803098 DEBUG [src/config.rs:1553] Using ../coeffs/LeftCH-96000.wav found relative to config file dir
2024-03-22 16:37:40.803103 DEBUG [src/config.rs:1549] ../coeffs/RightCH-96000.wav is relative
2024-03-22 16:37:40.803108 DEBUG [src/config.rs:1553] Using ../coeffs/RightCH-96000.wav found relative to config file dir
2024-03-22 16:37:40.809355 DEBUG [src/filters.rs:178] Read raw data from: '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, number of coeffs: 262145
2024-03-22 16:37:40.810764 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145
2024-03-22 16:37:40.817058 DEBUG [src/filters.rs:178] Read raw data from: '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, number of coeffs: 262145
2024-03-22 16:37:40.818617 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145
2024-03-22 16:37:40.818639 DEBUG [src/bin.rs:808] Config is valid
2024-03-22 16:37:40.818801 DEBUG [src/socketserver.rs:432] Start websocket server on 127.0.0.1:1234
2024-03-22 16:37:40.818978 DEBUG [src/bin.rs:994] Wait for config
2024-03-22 16:37:40.818992 DEBUG [src/bin.rs:1010] Waiting to receive a command
2024-03-22 16:37:40.818998 DEBUG [src/bin.rs:1013] Config change command received
2024-03-22 16:37:40.819006 DEBUG [src/bin.rs:999] New config is available and there are no queued commands, continuing
2024-03-22 16:37:40.819010 DEBUG [src/bin.rs:1036] Config ready, start processing
2024-03-22 16:37:40.819178 DEBUG [src/bin.rs:157] Using channels [true, true]
2024-03-22 16:37:40.819184 DEBUG [src/filters.rs:488] Build new pipeline
2024-03-22 16:37:40.819306 DEBUG [src/filters.rs:364] Build filter group from config
2024-03-22 16:37:40.819305 DEBUG [src/audiodevice.rs:465] Creating asynchronous resampler with parameters: SincInterpolationParameters { sinc_len: 256, f_cutoff: 0.9470547, oversampling_factor: 256, interpolation: Cubic, window: BlackmanHarris2 }
2024-03-22 16:37:40.825656 DEBUG [src/filters.rs:178] Read raw data from: '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, number of coeffs: 262145
2024-03-22 16:37:40.827541 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145
2024-03-22 16:37:40.837181 DEBUG [src/fftconv.rs:50] Conv Left Channel Correction is using 129 segments
2024-03-22 16:37:40.846586 DEBUG [src/alsadevice.rs:334] Available Playback devices: [("hw:TosLink,0,0", "MCHStreamer TosLink, USB Audio, subdevice #0"), ("hw:vc4hdmi0,0,0", "vc4-hdmi-0, MAI PCM i2s-hifi-0, subdevice #0"), ("hw:vc4hdmi1,0,0", "vc4-hdmi-1, MAI PCM i2s-hifi-0, subdevice #0"), ("null", "Discard all samples (playback) or generate zero samples (capture)"), ("default", "Default Audio Device"), ("sysdefault", "Default Audio Device"), ("hw:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nDirect hardware device without any conversions"), ("plughw:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nHardware device with all software conversions"), ("default:CARD=TosLink", "MCHStreamer TosLink, USB Audio\nDefault Audio Device"), ("sysdefault:CARD=TosLink", "MCHStreamer TosLink, USB Audio\nDefault Audio Device"), ("front:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nFront output / input"), ("surround21:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n2.1 Surround output to Front and Subwoofer speakers"), ("surround40:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n4.0 Surround output to Front and Rear speakers"), ("surround41:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n4.1 Surround output to Front, Rear and Subwoofer speakers"), ("surround50:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n5.0 Surround output to Front, Center and Rear speakers"), ("surround51:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n5.1 Surround output to Front, Center, Rear and Subwoofer speakers"), ("surround71:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\n7.1 Surround output to Front, Center, Side, Rear and Woofer speakers"), ("iec958:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nIEC958 (S/PDIF) Digital Audio Output"), ("dmix:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nDirect sample mixing device"), ("hw:CARD=vc4hdmi0,DEV=0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nDirect hardware device without any conversions"), ("plughw:CARD=vc4hdmi0,DEV=0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nHardware device with all software conversions"), ("default:CARD=vc4hdmi0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nDefault Audio Device"), ("sysdefault:CARD=vc4hdmi0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nDefault Audio Device"), ("hdmi:CARD=vc4hdmi0,DEV=0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nHDMI Audio Output"), ("dmix:CARD=vc4hdmi0,DEV=0", "vc4-hdmi-0, MAI PCM i2s-hifi-0\nDirect sample mixing device"), ("hw:CARD=vc4hdmi1,DEV=0", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nDirect hardware device without any conversions"), ("plughw:CARD=vc4hdmi1,DEV=0", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nHardware device with all software conversions"), ("default:CARD=vc4hdmi1", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nDefault Audio Device"), ("sysdefault:CARD=vc4hdmi1", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nDefault Audio Device"), ("hdmi:CARD=vc4hdmi1,DEV=0", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nHDMI Audio Output"), ("dmix:CARD=vc4hdmi1,DEV=0", "vc4-hdmi-1, MAI PCM i2s-hifi-0\nDirect sample mixing device")]
2024-03-22 16:37:40.847172 DEBUG [src/filters.rs:364] Build filter group from config
2024-03-22 16:37:40.847319 DEBUG [src/alsadevice.rs:352] Playback: supported channels, min: 2, max: 2, list: [2]
2024-03-22 16:37:40.847329 DEBUG [src/alsadevice.rs:353] Playback: setting channels to 2
2024-03-22 16:37:40.847364 DEBUG [src/alsadevice.rs:357] Playback: supported samplerates: Discrete([44100, 48000, 88200, 96000, 176400, 192000])
2024-03-22 16:37:40.847371 DEBUG [src/alsadevice.rs:358] Playback: setting rate to 96000
2024-03-22 16:37:40.847380 DEBUG [src/alsadevice.rs:362] Playback: supported sample formats: [S16LE, S32LE]
2024-03-22 16:37:40.847384 DEBUG [src/alsadevice.rs:363] Playback: setting format to S32LE
2024-03-22 16:37:40.847410 DEBUG [src/alsadevice_buffermanager.rs:57] Setting buffer size to 8192 frames
2024-03-22 16:37:40.847425 DEBUG [src/alsadevice_buffermanager.rs:70] Device is using a buffer size of 8192 frames
2024-03-22 16:37:40.847431 DEBUG [src/alsadevice_buffermanager.rs:78] Setting period size to 1024 frames
2024-03-22 16:37:40.852222 DEBUG [src/alsadevice.rs:334] Available Capture devices: [("hw:TosLink,0,0", "MCHStreamer TosLink, USB Audio, subdevice #0"), ("null", "Discard all samples (playback) or generate zero samples (capture)"), ("default", "Default Audio Device"), ("sysdefault", "Default Audio Device"), ("hw:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nDirect hardware device without any conversions"), ("plughw:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nHardware device with all software conversions"), ("default:CARD=TosLink", "MCHStreamer TosLink, USB Audio\nDefault Audio Device"), ("sysdefault:CARD=TosLink", "MCHStreamer TosLink, USB Audio\nDefault Audio Device"), ("front:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nFront output / input"), ("dsnoop:CARD=TosLink,DEV=0", "MCHStreamer TosLink, USB Audio\nDirect sample snooping device")]
2024-03-22 16:37:40.853244 DEBUG [src/filters.rs:178] Read raw data from: '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, number of coeffs: 262145
2024-03-22 16:37:40.853804 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145
2024-03-22 16:37:40.862007 DEBUG [src/fftconv.rs:50] Conv Right Channel Correction is using 129 segments
2024-03-22 16:37:40.868992 DEBUG [src/alsadevice.rs:387] Opening Playback device "hw:TosLink" with parameters: HwParams { channels: Ok(2), rate: "Ok(96000) Hz", format: Ok(S32LE), access: Ok(RWInterleaved), period_size: "Ok(1024) frames", buffer_size: "Ok(8192) frames" }, SwParams(avail_min: Ok(2048) frames, start_threshold: Ok(1) frames, stop_threshold: Ok(8192) frames)
2024-03-22 16:37:40.869042 DEBUG [src/alsadevice.rs:392] Playback device "hw:TosLink" successfully opened
2024-03-22 16:37:40.869101 DEBUG [src/bin.rs:265] Playback thread ready to start

2024-03-22 16:37:40.869478 DEBUG [src/alsadevice.rs:387] Opening Capture device "hw:TosLink" with parameters: HwParams { channels: Ok(2), rate: "Ok(96000) Hz", format: Ok(S32LE), access: Ok(RWInterleaved), period_size: "Ok(1024) frames", buffer_size: "Ok(8192) frames" }, SwParams(avail_min: Ok(2048) frames, start_threshold: Ok(0) frames, stop_threshold: Ok(8192) frames)
2024-03-22 16:37:40.869497 DEBUG [src/alsadevice.rs:392] Capture device "hw:TosLink" successfully opened
2024-03-22 16:37:40.869511 DEBUG [src/bin.rs:275] Capture thread ready to start
2024-03-22 16:37:40.869519 DEBUG [src/bin.rs:278] Both capture and playback ready, release barrier
2024-03-22 16:37:40.871440 DEBUG [src/processing.rs:19] build filters, waiting to start processing loop
2024-03-22 16:37:40.871453 DEBUG [src/processing.rs:21] Processing loop starts now!
2024-03-22 16:37:40.871458 DEBUG [src/bin.rs:280] Supervisor loop starts now!
2024-03-22 16:37:40.871459 DEBUG [src/alsadevice.rs:1037] Starting captureloop
2024-03-22 16:37:40.871478 DEBUG [src/alsadevice.rs:951] Starting playback loop
2024-03-22 16:37:40.871485 DEBUG [src/alsadevice.rs:415] Playback loop uses a buffer of 2048 frames
2024-03-22 16:37:40.871640 DEBUG [src/alsadevice.rs:657] Capture loop uses a buffer of 8192 frames
2024-03-22 16:37:40.871671 DEBUG [src/alsadevice.rs:253] Starting capture from state: SND_PCM_STATE_PREPARED, Ready to start
2024-03-22 16:37:40.907238 INFO [src/alsadevice.rs:142] PB: Starting playback from Prepared state
2024-03-22 16:37:41.140921 DEBUG [/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tungstenite-0.21.0/src/handshake/server.rs:285] Server handshake done.
2024-03-22 16:37:41.141382 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetVersion)

2024-03-22 16:37:43.036896 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.124))
2024-03-22 16:37:43.046941 DEBUG [/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tungstenite-0.21.0/src/handshake/server.rs:285] Server handshake done.

2024-03-22 16:37:47.332295 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetVolume)
2024-03-22 16:37:47.333179 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetMute)
2024-03-22 16:37:47.348131 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:37:47.348356 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.12))
2024-03-22 16:37:47.469221 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:37:47.469466 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.12))
2024-03-22 16:37:47.626657 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:37:47.627172 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.157))
2024-03-22 16:37:47.627528 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetCaptureRate)
2024-03-22 16:37:47.627716 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetRateAdjust)
2024-03-22 16:37:47.627988 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetBufferLevel)
2024-03-22 16:37:47.628132 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetClippedSamples)
2024-03-22 16:37:47.628268 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetProcessingLoad)

2024-03-22 16:37:50.738497 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetRateAdjust)
2024-03-22 16:37:50.738632 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetBufferLevel)
2024-03-22 16:37:50.738760 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetClippedSamples)
2024-03-22 16:37:50.738893 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetProcessingLoad)
2024-03-22 16:37:50.875271 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:37:50.875513 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.137))
2024-03-22 16:37:50.892136 DEBUG [src/alsadevice.rs:573] PB: buffer level: 2204.2, signal rms: Some(HistoryRecord { time: Instant { tv_sec: 23192, tv_nsec: 580353512 }, values: [4.9585313e-5, 8.4343956e-5] })
2024-03-22 16:37:51.033047 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:37:51.033293 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.158))

2024-03-22 16:38:00.892611 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.12))
2024-03-22 16:38:00.897474 DEBUG [src/alsadevice_utils.rs:251] Avg. buffer delay: 2157.8, target delay: 2048, diff: 109.825159914712, prev_div: 156.19444444444434, corrected capture rate: 100.0000%
2024-03-22 16:38:00.897508 DEBUG [src/alsadevice.rs:573] PB: buffer level: 2157.8, signal rms: Some(HistoryRecord { time: Instant { tv_sec: 23202, tv_nsec: 585691634 }, values: [8.435464e-5, 0.00013597931] })
2024-03-22 16:38:00.897520 DEBUG [src/bin.rs:386] SetSpeed message received
2024-03-22 16:38:01.012470 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)

2024-03-22 16:38:05.047424 DEBUG [src/bin.rs:835] Received signal: 15
2024-03-22 16:38:05.047506 INFO [src/bin.rs:868] Shutting down
2024-03-22 16:38:05.047599 DEBUG [src/bin.rs:244] Exit requested...
2024-03-22 16:38:05.055533 DEBUG [src/alsadevice.rs:688] Exit message received, sending EndOfStream
2024-03-22 16:38:05.068675 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetState)
2024-03-22 16:38:05.068922 DEBUG [src/socketserver.rs:522] parsed command: Ok(GetSignalLevelsSince(0.136))
2024-03-22 16:38:05.093792 DEBUG [src/bin.rs:1038] Processing ended with status Ok(Exit)
2024-03-22 16:38:05.093805 DEBUG [src/bin.rs:1048] Exiting

 

[HenrikEnquist]

Do you see any messages saying "sample rate change detected, last rate was NNNN Hz"?
It would be interesting to see if any such messages show up after a rate change, for both the cases when the rate increases and when it decreases.

 

[mevang]

The MCHStreamer has a misleading name!

Yes, the name made me think of that device also acting as a streamer. Thank you for clarifying.

 

[TerryForsythe]

Do you see any messages saying "sample rate change detected, last rate was NNNN Hz"?
It would be interesting to see if any such messages show up after a rate change, for both the cases when the rate increases and when it decreases.

No. I just ran it again, changing between a hi resolution song and a low resolution song a few times.

1. There are 6 lines in the log file with the term "samplerate" (none with the term "sample rate").

2024-03-22 18:01:42.147704 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145

2024-03-22 18:01:42.155513 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145

2024-03-22 18:01:42.164671 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/LeftCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145

2024-03-22 18:01:42.182496 DEBUG [src/alsadevice.rs:357] Playback: supported samplerates: Discrete([44100, 48000, 88200, 96000, 176400, 192000])

2024-03-22 18:01:42.187199 DEBUG [src/filters.rs:337] Read wav file '/home/tforsythe/camilladsp/configs/../coeffs/RightCH-96000.wav', format: FLOAT32LE, channel: 0 of 1, samplerate: 96000, length: 262145

2024-03-22 18:01:42.205349 DEBUG [src/alsadevice.rs:357] Capture: supported samplerates: Discrete([96000])


2. Searching on the term "change", the only line that comes up is as follows, just once:

2024-03-22 18:01:42.139766 DEBUG [src/bin.rs:800] No change to state from camilladsp/statefile.yml, not overwriting.


3. NOTE:

I tried using static names for the filter filenames for each sample rate, e.g., LeftCH-96000.wav, and using a variable, e.g., LeftCH-$samplerates$.wav. The result is the same.

 

[HenrikEnquist]

No. I just ran it again, changing between a hi resolution song and a low resolution song a few times

Ok, then it seems that when the incoming rate changes, this device continues delivering garbage samples at the rate it was opened at.
This unfortunately means that there is no way of knowing that the incoming rate has changed (and to what value).
Spdif input with varying sample rate is really not simple, most devices handle is poorly.
Here is complete solution, quite advanced diy:
https://github.com/raptorlightning/I2S-Hat

 

[TerryForsythe]

There is one other issue that may or may not be related.

Initially, following the tutorial on the ASR forum, I installed Ubuntu Server on the Raspberry Pi. 192k, 96k, 48k and 44.1k sample rates all worked, so long as the correct configuration file was manually selected in CamillaDSP, I had the WiiM set to stream at that sample rate, and the song was being streamed from Tidal with at least the sample rate set in the WiiM.

Ubuntu had libwebsockets19 installed, but camilladsp-setrate did not work with it. The service would not start and reported an error. Installing libwebsockets17 onto Ubuntu did not resolve the issue for me. So, I installed Raspberry Pi OS and tried again. The camilladsp-setrate service now would start without error.

I had backed up my camilladsp configs from the Ubuntu installation and uploaded those same files back into ~/camilladsp/configs in the Raspberry Pi installation. 96k, 48k and 44.1k sample rates work, but 192k sample rate no longer works. I tried recreating the config for it, but that did not work.

Anyway, this is a minor issue. Unless I can get CamillaDSP to automatically change the sample rate, I am stuck at 44.1k.

 

[TerryForsythe]

Ok, then it seems that when the incoming rate changes, this device continues delivering garbage samples at the rate it was opened at.
This unfortunately means that there is no way of knowing that the incoming rate has changed (and to what value).
Spdif input with varying sample rate is really not simple, most devices handle is poorly.
Here is complete solution, quite advanced diy:
https://github.com/raptorlightning/I2S-Hat

Thank you. I'll check it out.

 

[HenrikEnquist]

but 192k sample rate no longer works. I tried recreating the config for it, but that did not work.

What happens? There will be some error in the CamillaDSP logs, what does it say?

 

[mevang]

I have fixed a bug causing the issue reported by @Cathul and @TerryForsythe.
Many thanks to the libwebsockets team, who gave me the right hint.

I have also added notes about the fact that devices other than USB gadgets may not provide the necessary information on sample rate change.

The new version has just been uploaded to github.
https://github.com/marcoevang/camilladsp-setrate