Re: [gentoo-user] VA-API support on Chrome
On Mon, Apr 29, 2019 at 12:02 PM Grant wrote: > Does anyone have VA-API working on Chromium or Chrome? I've chased > down a few possibilities but ended up at dead ends. > > - Grant > > I finally managed to get chromium-74.0.3729.108 working with vaapi. See: https://www.reddit.com/r/Gentoo/comments/bgizgb/help_enabling_h264_decoding_support_through/enhyy3q?utm_source=share&utm_medium=web2x
[gentoo-user] New Intel CPU flaws discovered
Here we go again; https://mdsattacks.com/ I notice a microcode update for skylake came through yesterday after being unchanged since the late June 2018, so i'm guessing this is patched for this issue. Just waiting for the gentoo sources ebuild to be bumped to 5.1.2 to try it out. Sounds like AMD not affected. Phoronix guy says "Supposedly up to 10% performance penalty for MDS. Benchmarks out later this week."
Re: [gentoo-user] USB Audio ?
On Tuesday, 14 May 2019 18:07:40 BST Jack wrote: > On 5/14/19 12:26 PM, tu...@posteo.de wrote: > > Question is: > > How can I create such an "receiver" for USB Audio signals to play > > them live with my PC? > > > > Cheers! > > Meino > > That's very different from what I (and I suspect others) thought about > your first posting. You want to do USB audio input, not output. May be worth searching the interwebs for 'USB streaming'. > In > this case, I don't think a usual USB audio device/dongle would even > help. My first suggestion is to just plug the USB from the Teensy into > the PC, and see what dmesg shows, and what lsusb shows. Searching on > the manufacturer and device IDs shown by lsusb might lead to solutions, > or at least to further lines of investigation. Also, the Teeny docs > might give more information about what kind of USB output their audio > produces, and I wonder if you might find some good info on their forum? > > Jack Assuming dmesg shows the device is recognised and it offers something ALSA can work with, launch jackd/qjackctl and see what you can configure there. I assume the synthesizer output is midi(?), in which case rosegarden will work with it. If it is already processed into digital audio then you may be able to play the input with VLC, by either pointing to the USB device (file), or perhaps play with VLC's Capture Device options, if it is recognised as such. -- Regards, Mick signature.asc Description: This is a digitally signed message part.
Re: [gentoo-user] USB Audio ?
On 05/14 01:07, Jack wrote: > On 5/14/19 12:26 PM, tu...@posteo.de wrote: > > On 05/13 11:24, Jack wrote: > > > On 2019.05.13 23:10, tu...@posteo.de wrote: > > > > Hi, > > > > > > > > is it somehow possible to play USB-Audio on a PC without one of these > > > > USB-dongle-"soundcards" (DACs)? > > > > > > > > I searched the web and only got links to those dongles... > > > > > > > > On the other hand: On the forum of the developers board one post > > > > spokes of a "dummy" USB-Audio device... > > > > > > > > How can I acchieve this? > > > > > > > > Thanks for any help in advance! > > > > Cheers! > > > > Meino > > > It's not clear what you really want. Why would you want USB audio without > > > an actual USB audio device? Without a USB audio dongle/device/whatever, > > > what would you have to actually produce sound?I can imagine a "dummy" > > > USB audio device - but I can imagine it for testing the software, but not > > > actually producing any sound, so why would you want it? > > > > > > Jack > > Hi Jack, > > > > I don't wanted to pollute my posting with non-Linux details...but here > > they are: > > > > I habe a Teensy 3.6 by PJRC (=>https://www.pjrc.com/), which has an > > USB-port. This port can be switched between a lot of USB-devices... > > ...one of them is an USB-audio device (output). > > The MK66FX1M0VMD18 uC has beside an FPU a DSP block. > > With a certain (open source) firmware this chip can be used as an > > synthesizer. > > > > To cut costs I wanted no USB dongle to play the sound ... I wanted > > to use my Linux PC as "Mega DAC"...so to say. > > > > Question is: > > How can I create such an "receiver" for USB Audio signals to play > > them live with my PC? > > > > Cheers! > > Meino > > That's very different from what I (and I suspect others) thought about your > first posting. You want to do USB audio input, not output. In this case, I > don't think a usual USB audio device/dongle would even help. My first > suggestion is to just plug the USB from the Teensy into the PC, and see what > dmesg shows, and what lsusb shows. Searching on the manufacturer and device > IDs shown by lsusb might lead to solutions, or at least to further lines of > investigation. Also, the Teeny docs might give more information about what > kind of USB output their audio produces, and I wonder if you might find some > good info on their forum? > > Jack > > Hi Jack, I already posted a question on the forum. The forum is about the Teensy and not Linux. Answer was: "On a Win PC (I do not use Linux) you have to select the Teensy Audio device (Open Sound Settings) to listen to teensy " I attached a screenshot of the devices I could choose via bootloader trickery. lsusb (the relevant portion) reported this when switch to USB Audio: [ 7722.526825] usb 6-2: new full-speed USB device number 18 using ohci-pci [ 7722.691955] usb 6-2: New USB device found, idVendor=16c0, idProduct=04d2, bcdDevice= 2.77 [ 7722.691962] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 7722.691966] usb 6-2: Product: Teensy Audio [ 7722.691970] usb 6-2: Manufacturer: Teensyduino [ 7722.691973] usb 6-2: SerialNumber: 4991790 [ 7722.700415] hid-generic 0003:16C0:04D2.0009: hidraw3: USB HID v1.11 Device [Teensyduino Teensy Audio] on usb-:00:12.0-2/input0 [ 7727.761957] usb 6-2: Warning! Unlikely big volume range (=4095), cval->res is probably wrong. [ 7727.761965] usb 6-2: [49] FU [PCM Playback Volume] ch = 2, val = 0/4095/1 (hidraw is always present and is used to communicate with the bootloader) 'udevadm monitor' shows this when plugging in the Teensy: monitor will print the received events for: UDEV - the event which udev sends out after rule processing KERNEL - the kernel uevent KERNEL[7867.891799] add /devices/pci:00/:00:12.0/usb6/6-2 (usb) KERNEL[7867.893472] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.0 (usb) KERNEL[7867.899759] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) KERNEL[7867.900306] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A/hidraw/hidraw3 (hidraw) KERNEL[7867.900398] bind /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.0/0003:16C0:04D2.000A (hid) KERNEL[7867.900669] bind /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.0 (usb) KERNEL[7867.900869] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1 (usb) KERNEL[7873.197477] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1/sound/card3 (sound) KERNEL[7873.197660] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0p (sound) KERNEL[7873.197670] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1/sound/card3/pcmC3D0c (sound) KERNEL[7873.197725] add /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1/sound/card3/controlC3 (sound) KERNEL[7873.197793] bind /devices/pci:00/:00:12.0/usb6/6-2/6-2:1.1 (usb) KERNEL[7873.197862] add /devices/pci:00/
Re: [gentoo-user] USB Audio ?
On 5/14/19 12:26 PM, tu...@posteo.de wrote: On 05/13 11:24, Jack wrote: On 2019.05.13 23:10, tu...@posteo.de wrote: Hi, is it somehow possible to play USB-Audio on a PC without one of these USB-dongle-"soundcards" (DACs)? I searched the web and only got links to those dongles... On the other hand: On the forum of the developers board one post spokes of a "dummy" USB-Audio device... How can I acchieve this? Thanks for any help in advance! Cheers! Meino It's not clear what you really want. Why would you want USB audio without an actual USB audio device? Without a USB audio dongle/device/whatever, what would you have to actually produce sound?I can imagine a "dummy" USB audio device - but I can imagine it for testing the software, but not actually producing any sound, so why would you want it? Jack Hi Jack, I don't wanted to pollute my posting with non-Linux details...but here they are: I habe a Teensy 3.6 by PJRC (=>https://www.pjrc.com/), which has an USB-port. This port can be switched between a lot of USB-devices... ...one of them is an USB-audio device (output). The MK66FX1M0VMD18 uC has beside an FPU a DSP block. With a certain (open source) firmware this chip can be used as an synthesizer. To cut costs I wanted no USB dongle to play the sound ... I wanted to use my Linux PC as "Mega DAC"...so to say. Question is: How can I create such an "receiver" for USB Audio signals to play them live with my PC? Cheers! Meino That's very different from what I (and I suspect others) thought about your first posting. You want to do USB audio input, not output. In this case, I don't think a usual USB audio device/dongle would even help. My first suggestion is to just plug the USB from the Teensy into the PC, and see what dmesg shows, and what lsusb shows. Searching on the manufacturer and device IDs shown by lsusb might lead to solutions, or at least to further lines of investigation. Also, the Teeny docs might give more information about what kind of USB output their audio produces, and I wonder if you might find some good info on their forum? Jack
Re: [gentoo-user] USB Audio ?
On 05/13 11:24, Jack wrote: > On 2019.05.13 23:10, tu...@posteo.de wrote: > > Hi, > > > > is it somehow possible to play USB-Audio on a PC without one of these > > USB-dongle-"soundcards" (DACs)? > > > > I searched the web and only got links to those dongles... > > > > On the other hand: On the forum of the developers board one post > > spokes of a "dummy" USB-Audio device... > > > > How can I acchieve this? > > > > Thanks for any help in advance! > > Cheers! > > Meino > It's not clear what you really want. Why would you want USB audio without > an actual USB audio device? Without a USB audio dongle/device/whatever, > what would you have to actually produce sound?I can imagine a "dummy" > USB audio device - but I can imagine it for testing the software, but not > actually producing any sound, so why would you want it? > > Jack Hi Jack, I don't wanted to pollute my posting with non-Linux details...but here they are: I habe a Teensy 3.6 by PJRC (=>https://www.pjrc.com/), which has an USB-port. This port can be switched between a lot of USB-devices... ...one of them is an USB-audio device (output). The MK66FX1M0VMD18 uC has beside an FPU a DSP block. With a certain (open source) firmware this chip can be used as an synthesizer. To cut costs I wanted no USB dongle to play the sound ... I wanted to use my Linux PC as "Mega DAC"...so to say. Question is: How can I create such an "receiver" for USB Audio signals to play them live with my PC? Cheers! Meino
Re: [gentoo-user] USB Audio ?
On Tuesday, 14 May 2019 04:24:46 BST Jack wrote: > On 2019.05.13 23:10, tu...@posteo.de wrote: > > Hi, > > > > is it somehow possible to play USB-Audio on a PC without one of these > > USB-dongle-"soundcards" (DACs)? > > > > I searched the web and only got links to those dongles... > > > > On the other hand: On the forum of the developers board one post > > spokes of a "dummy" USB-Audio device... > > > > How can I acchieve this? > > > > Thanks for any help in advance! > > Cheers! > > Meino > > It's not clear what you really want. Why would you want USB audio > without an actual USB audio device? Without a USB audio > dongle/device/whatever, what would you have to actually produce > sound?I can imagine a "dummy" USB audio device - but I can imagine > it for testing the software, but not actually producing any sound, so > why would you want it? > > Jack As Jack said, a USB connector passes digital signals from your audio source (PC media player) to a USB connected device, which is able to convert the digital signals to analogue audio (DAC chip). Without such a converter you wouldn't be able to hear sound coming out of whatever you connected to the USB port. If you connect USB speakers, a soundbar, USB-C earphones and the like, they all have some DAC converter chip on them to turn the binary USB input into audible sound. There's Class 1 and Class 2 USB audio devices. Class 1 can process up to a maximum of 24-bit/96kHz files, while Class 2 can reach up to 24-bit/192kHz - if you have this quality of audio files. A dummy audio driver pretends it is an audio device for testing the audio on your PC, but it will not produce audio output. I found this page explaining how USB audio works: https://www.edn.com/design/consumer/4376143/Fundamentals-of-USB-Audio -- Regards, Mick signature.asc Description: This is a digitally signed message part.
