Молодцы какие. Где остальные мегабиты?
Вот что пишут
Сразу выжимка:
POST UPDATE:
I’ve lived with the new Raspberry PI B+ for a couple of days and done some careful testing on it. Of course, my main interest was to back my hypothesis of better USB Audio performances, so I went straight ahead and connected my Pro-Ject Pre BOX S2 Digital (since it can reach up to 32\768 via USB and play DSD 512 in Native mode).
All tests were made with the experimental image that can be found here
As usual, I started playing my “Raspberry killer” track: a 32 bit, 678 kHz .wav file from my NAS. And… What a terrible disappointment: loads of crackles and a whole lot of lost packets.
Tried then with DSD, 24/192 flacs, and even 16/44.1 flacs. All sounded just terrible. So, indeed the new USB BUS did change USB Audio performances, unfortunately, it did for the worst.Luckily though, I then tried to play the same files from a USB drive (and not from a NAS), and magic happened: spotless playback up to 32\768. Seemed that taking ethernet (I was connected on wired connection) out of the equation did the trick. So connected the PI via wifi and restarted without ethernet: same result, HI-Res Music playback was just perfect to my USB DAC.
So, it seems that there is still some issue (hopefully it’s driver related) to the Ethernet controller, which seems to give up lots of packets in high-bandwidth situations. I am however pretty confident that the foundation will solve this issue, as it’s not uncommon that hardware performances get dramatic improvements as software gets tuned up after community feedbacks.
The good news is that there are actually tangible improvements on USB throughput, as I did not experience a single glitch with a great variety of files: 16\44.1,24\96,32\768 flac, DSD64, DSD128, DSD256 and 8X MQA (this is an extremely meaningful test, since if even a single packet is lost the MQA decoding would stop).
So, for now, if you avoid using Ethernet to retrieve your Hi-Res files, the PI 3B+is just perfect to feed your USB DAC with bit-perfect joy.
Итого: если не стримить аудио по эзенету, а забирать его с ЮСБ накопителя, то вроде бы все зашибись. И даже если стримить по вайфаю - тоже ок.