piCorePlayer6.1.0-Xenomai-44.1-48KHz雙機入門簡易安裝教學

[seeteeyou]

最近日本音響BLOG主幫他Player的樹莓派4換上了全銅製的外殼，換上後他說聲音更厚重、音場更大、背景更安靜了。
https://desalvoinc.com/products/soli...raspberry-pi-4
雖然樹莓派4售價只要50美金左右而這個全銅製的外殼售價高達250美金。但是他覺得這個價錢能夠讓聲音提升這麼多簡直是超值，
所以他又馬上下單買了2個回來給LMS和OMV來使用。根據他的說法3台樹莓派4都使用全銅外殼後，在聲音提升的效益並沒有遞減
反而是x3。他的BLOG的讀者已經有好幾位也跟進購買全銅外殼回來使用，目前使用過的人都覺得這個外殼對聲音的提升相當的超值。
雖然這個全銅外殼250美金的售價相當的昂貴，不過使用過的人反應都相當的好所以小弟提供情報出來給大家當作個參考。

售罄了很多個月，機會終於來臨。

但是 Apple M1 又非常吸引，畢竟優化 Linux kernel 5.13 亦取得了相當的進展，暫時不知道全銅外殼的樹莓派 4 還是沒有全銅外殼的 Mac Mini 比較佔優。

理論上是不會有 Mac Mini 專用的全銅外殼，除非參與團購的人數比較多，否則找到可靠的淘寶賣家也只會得到令人咋舌的 CNC 報價。

當然最重要的就是設計 CAD Models 的部分，基本上是無法在網上找得到免費的 CAD Models。

[simon]

可用以下Phineas 鋁Case, 據廠方測試結果更優勝。價錢也較好
https://desalvoinc.com/collections/f...raspberry-pi-4

[tony-tsai]

『無法以上述方法登入』的部分需要澄清，是否用另一台電腦 ping 它的 IP address 也沒反應呢？

或者 Angry IP Scanner 是否能夠找到樹莓派的 IP address 呢？

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http://www.cxyzjd.com/article/nanhantianyi/106542616

也許更新 EEPROM 會有幫助，SD 卡開機的話是這個：

https://github.com/raspberrypi/rpi-e...00138a1-sd.zip

USB 開機的話就是這個：

https://github.com/raspberrypi/rpi-e...0138a1-usb.zip

仍然有問題的話可以試試官方的 pCP8，成功的話就代表問題的癥結是比較挑 SD 卡和 USB，換一些比較新或者讀寫速度比較高的再試試：

https://repo.picoreplayer.org/insitu....0.0-64Bit.zip

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還有另一案例是舊版本能夠成功開機，新版本則不行，最後發現是因為電源只有 5V／2A 輸出，僅需另一 5V／3A 輸出的電源就所有版本也能夠成功開機了。

但是電壓方面必須是 5V 的，敬請留意。

謝謝seeteeyu兄的回覆, 我的狀況是開機都沒問題, 差別是灌pCP6時可以ssh進帳號tc, 但是灌pCP8時就無法ssh 進帳號tc, 二者IP均相同, 用IP scan蜠可以看到IP, 我感覺是pCP8的帳號不是tc

[seeteeyou]

謝謝seeteeyu兄的回覆, 我的狀況是開機都沒問題, 差別是灌pCP6時可以ssh進帳號tc, 但是灌pCP8時就無法ssh 進帳號tc, 二者IP均相同, 用IP scan蜠可以看到IP, 我感覺是pCP8的帳號不是tc

tony-tsai 兄您好，不用客氣。

小弟有一些頭緒了，其實是醬子的，如果 tony-tsai 兄是參考 tetsuka 兄的教學，Windows 內建的 SSH 會把 key 放在 C:\Users\tony-tsai\.ssh 那個資料夾，由於 pCP6 那邊的 key 跟那個 Windows 資料夾的 key 完全脗合，因此 SSH 是正常的。

畢竟 pCP6 和 pCP8 兩者 的 IP address 均相同，故此升級到 pCP8 後應該是需要建立新的 key，可惜 Windows 並不會作出任何提示，大概是需要自己開啟 Event Viewer 才知道是 key 那方面出了狀況：

https://github.com/PowerShell/Win32-...ing-Facilities

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比較簡單的方法就是首先把整個 C:\Users\tony-tsai\.ssh 資料夾備份，然後把它重新命名後再嘗試 SSH，假如還是不行的話就直接用 PuTTY 或者 KiTTY 將會更加方便，實際上小弟也不是很喜歡 Windows 內建的東西：

https://portableapps.com/apps/internet/putty_portable
https://www.chiark.greenend.org.uk/~...ty/latest.html

https://portableapps.com/apps/internet/kitty-portable
http://www.9bis.net/kitty/#!pages/download.md

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其他有用的文章：

https://blog.alantsai.net/posts/2015...ows-for-github

https://forums.slimdevices.com/showt...l=1#post982100

https://docs.microsoft.com/en-us/win..._keymanagement

[seeteeyou]

魅力沒法擋的純銅外殼，縱使價格高達 250 鎂，不出數天就已經出現搶購一空的景象，成為一時佳話：

https://www.facebook.com/groups/1494...67820481350500

Our previous post in February about this case might have accelerated its sales. This model has been indicated as "sold out" since March.

Now it is available again with a new engraving design for the same price.

Those of you who have purchased the Diretta Target USB bridge for x64 version and tried to run it on the Raspberry Pi 4B may have been impressed far less by its sound compared with the x64 PC.

This is understandable if you use a "normal" case.

Importing this copper case from the US causes huge additional cost, but you will not regret once you have experienced its sound.

那 Facebook 社團的貼文於星期二下午出現，估不到今天星期五已經成為過去式，不足 72 小時就沽清了。

[sam0402]

小弟有一些頭緒了，其實是醬子的，如果 tony-tsai 兄是參考 tetsuka 兄的教學，Windows 內建的 SSH 會把 key 放在 C:\Users\tony-tsai\.ssh 那個資料夾，由於 pCP6 那邊的 key 跟那個 Windows 資料夾的 key 完全脗合，因此 SSH 是正常的。

畢竟 pCP6 和 pCP8 兩者 的 IP address 均相同，故此升級到 pCP8 後應該是需要建立新的 key，可惜 Windows 並不會作出任何提示，大概是需要自己開啟 Event Viewer 才知道是 key 那方面出了狀況：

小弟平常用MacOS 和 Linux，登入時被版本卡住，我都是直接刪 .ssh/known_hosts 這個檔。
反正自己會重建，我想Windows 應該也是一樣的。

[sam0402]

piCorePlayer 8 Quantum CM4 eMMC 沒完沒了的版本

請參閱
http://www.stsd99.com/phpBB3/viewtop...1cbd54f#p19999

[seeteeyou]

這個 SlimStreamer 和 SlimPlexor 的組合相當有意思，讓 LMS 專注於管理音樂那些部分，然後其他部分被分拆出來就可以令音效質素更上一層樓的說：



https://lt.linkedin.com/in/akislovskij
https://github.com/gimesketvirtadieni/slimplexor
https://github.com/gimesketvirtadieni/slimstreamer

After years of development, LMS, a central part of Squeezebox based solution, has become a big monolithic Web application. To be fair, it works nicely (thanks to community); however, it has an essential drawback (one may consider it as a design flaw) – everything has to be managed by LMS. Music collection (local / remote), streaming services, alarms, etc. have to be integrated within LMS through plugins or similar.

This is where SlimStreamer comes in: it decouples Squeezebox streaming capability from the rest of the functionality around managing music (Single responsibility principle). Any application that outputs audio to a default ALSA device can be used as a music source for streaming. In fact, audio streaming is done transparently by SlimStreamer and SlimPlexor (an ALSA plugin) behind the scene. Moreover, SlimStreamer captures PCM stream in a bit-perfect way (without resampling to a predefined sample rate), which allows streaming audio in best possible quality!

https://www.diyaudio.com/forums/soft...ml#post5285442

I use SlimProto (SlimProto TCP protocol - SqueezeboxWiki), the same protocol used by Logitech Media Server (Logitech Media Server - SqueezeboxWiki). In other words, SlimStreamer mimics Logitech Media Server. This protocol came a long way; companies like Slim Devices and Logitech put a lot of expertise into it: SlimProto is the next version of SLIMP3, it supports lots of codecs, it allows using various sample rates, synchronisation, DSD over PCM (have not tested), … However the main reason I have chosen using it – players can be Pi Model A or Zero with decent DAC running a single SW player (squeezelite). The rest of the music functionality is done on server (regular player, MPD, Mopidy, Spotify, ShairPlay, …).

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看來最強的組合是 NFS 配上 Music Player Daemon：

https://www.head-fi.org/threads/cx-e...#post-16466560

You won’t need to run a server such as minimserver etc as it links directly to your local library at storage/ . You will need to use an MPD (not upnp) controller such as Rigelian to control direct play MPD. For PGGB files stored on your server it is the best sonics I have found. Beats out HQPlayer and Squeeze imho.

https://www.head-fi.org/threads/cx-e...#post-16466931

Thanks for that. Easy as heck to get this running. I already had 8player on my iPhone so it was easy to get music playing. Bloody hell this sounds great. Yeah I know @Triode User told me so, but I can occasionally be stubborn.

i really love how the shared library is used across all their apps. So easy to switch between them.

https://www.snakeoil-os.net/forums/T...d=3893#pid3893

To me, MPD with NFS produces the best sound. uPnp can't produces such sound. But sadly there are some players accept upnp rather then NFS, as upnp it is supported widely in streaming and OPENHome.

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剛剛看到 soundcheck 兄的 sKit 又更新了，它能夠支援官方（kernel 版本是 5.10）的 pCP8，理論上 5.13 版本的 kernel 應該不會有問題吧：

https://github.com/klslz/sKit
https://soundcheck-audio.blogspot.co...g-skit-15.html

這是 Khadas Tone Board 的用家，任何 iFi 的電供也不會比 Elecom ACDC-PD1165BK 便宜，但 iFi 仍然是基於 Si 的技術，因此還是比不上 GaN 的說，可是效果已經很不錯，大概是那些電容的功勞吧：

https://soundcheck-audio.blogspot.co...-skit-pcp.html

Dear Soundcheck, i installed one fresh piCorplayer + sKit 1.5 on Pi4 + KTB. Pi4 and KTB are powered with 2 iFi ps + extra caps. The sound is just absolutely f...ing great. I have one (very ?) good system. I just can't stop listen. One question - squeezelite is running on core 1&2, core 3 is reserved. What is running on core 3 ?

The squeezelite (my optimized squeezelite version!) alsa-output thread gets assigned to CPU3 exclusively. The idea is to avoid as much distraction for that key process as possible.

[sam0402]

Squeezelite 優化

請參閱
http://www.stsd99.com/phpBB3/viewtop...64fb32d#p20006

[seeteeyou]

https://www.stsd99.com/phpBB3/viewto...p=19679#p19679

由於製作Kernel時，CF卡的供電對於量子效應的影響甚大，小弟把腦筋動到Rip CD上了。
小弟猜想檔案產生時，用於CF卡電供的色音特質會進入kernel，或許Rip CD也是如此。

小弟這兩天用CF卡加上電訊分離的方式，使用GaN+雙大電容供電，把RIP檔直接寫入CF卡，
結果聲音比我以往直接寫入記憶體或外接硬體的方式更佳，聲音透明度更高，樂器的分離度也更好。
未來我也會採用此法RIP CD，在這裡分享此經驗給樂友們參考。

萬事俱備，只欠東風，如果 sam0402 兄能夠更新 pcp-cdda2wav.tcz 和編譯 5.13 版本專用的 cdrom kernel module 就完美了：

https://forums.slimdevices.com/showt...l=1#post925203

Got it working.

1) it looks like that I have to first plug the USB drive and only then power the rpi.
2) power was an issue with my portable Samsung SE-118 USB drive. I choose double USB plug.
3) Then I had to activate in FileTypes under CD player: FLAC = cdda2wav/FLAC (as on windows based LMS)
(PCM=cdda2wav is not working. Could I also go this way? What is missing?)
4) I could then listen to music, but the drive was terrible slow. It tooks 30 to 60 seconds until a track started to play.
5) I have then used a fully powered USB drive box from LG GSA-E60L. Everythings works very smooth and fast.

除了 RIP CD 之外，ALSA 還有一些 modules 可以配合 arecord 錄製實時播放 CD 的音效，那麼 snd-aloop 加上 libasound 的話該可以得到 Rich 和 Stylish 的效果：

https://www.alsa-project.org/wiki/Matrix:Module-aloop

modprobe snd-aloop ; modprobe snd-pcm-oss ; modprobe snd-mixer-oss ; modprobe snd-seq-oss

樹莓派使用ALSA內錄音頻， 錄取音效卡輸出的音訊
https://www.itread01.com/content/1548666206.html