Re: [Musicpd-dev-team] [PATCH/RFC] Fix DSD-over-USB playback
On 6/4/2012 1:52 μμ, Jurgen Kramer wrote: The attached patch fixes playback for DSD-over-USB. Without this patch MPD uses a frame size of 2 (stereo files) while the actual needed frame size for the used output sample format is 8 (sample formats S24_P32 and S32). Maybe this is not the proper/complete solution but will at least allow users to test the current DSD-over-USB code and hopefully provides some clues for the actual fixes (if needed). Below some more background info. --- src/output/alsa_output_plugin.c |7 ++- 1 files changed, 6 insertions(+), 1 deletions(-) Jurgen Background: For SAMPLE_FORMAT_DSD in- and out frame sizes are 2 (stereo files). When using DSD2PCM the sample format is set to SAMPLE_FORMAT_FLOAT which has a frame sizes of 8. For DSD-over-USB the sample format remains on SAMPLE_FORMAT_DSD with a frame size of 2 which results in too little data (4x) being sent to the receiving audio device. I just ran a quick test and DSD over USB playback is working fine with this patch on my XMOS board. Thanks. -- For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 ___ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
Re: [Musicpd-dev-team] DSD over USB
On 24/3/2012 7:49 μμ, Jurgen Kramer wrote: On Sat, 2012-03-24 at 13:16 -0400, Jesus R wrote: Thanks for that tip! I have it working now with plughw as well... I just did a quick addition (proof-of-concept) to pcm_dsd_usb.c to let it support version 1 of the dsd-over-usb spec (0x05 and 0xFA markers) and it works :-). This means support for v1 will be a fairly easy addition. We only need a way to select between v1 en pre-v1. Jurgen As v1.0 supersedes previous versions, I fail to see a reason to support the old spec. -- This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure ___ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
Re: [Musicpd-dev-team] DSD over USB
I had to use plughw to get past that error.
On 23/3/2012 1:40 μμ, Jurgen Kramer wrote:
On Thu, 2012-03-22 at 17:23 +0100, Jurgen Kramer wrote:
I took a quick look at the code, it seems it supports the pre-1.0
version of the standard (0xAA markers). I'll give it a test tomorow. My
DAC supports both version 1.0 and pre-1.0.
Jurgen
OK I just test the new code, unfortunately it does not work for me
either. It fails to setup ALSA. I tried both through the firewire driver
and through a SOtM usb-to-spdif converter.
Mytek DAC through firewire snd driver:
Mar 23 12:28 : output: Failed to open DAC [alsa]: Failed to configure
DSD-over-USB on ALSA device hw:1,0
Through SOtM usb-to-spdif converter:
Mar 23 12:32 : output: Failed to open sotm [alsa]: Failed to configure
DSD-over-USB on ALSA device iec958:CARD=S20,DEV=0
@Max can you shed some light on this? Are there any configuration
options I need to try/add?
My mpd.conf enty for the SOtM is:
# Entry for SOtM dX-USB HD - USB to SPDIF/Toslink/AES-EBU
audio_output {
typealsa
namesotm
device iec958:CARD=S20,DEV=0
use_mmapno
mixer_type disabled
dsd_usb yes
}
I have also tried with use_mmap yes.
With my old code is opens the ALSA device with:
Mar 23 12:38 : output: opened plugin=alsa name=sotm
audio_format=176400:32:2
Mar 23 12:40 : output: opened plugin=alsa name=DAC
audio_format=176400:32:2
These work for my installation.
BTW would it be doable to enable dsd_usb for pipe output? That is really
handy for debugging output of the decoder.
Jurgen
--
This SF email is sponsosred by:
Try Windows Azure free for 90 days Click Here
http://p.sf.net/sfu/sfd2d-msazure
___
Musicpd-dev-team mailing list
Musicpd-dev-team@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
[Musicpd-dev-team] DSD over USB
Hi , I've been testing the latest git with DSD over USB support this morning. I'm using an XMOS UAC2 board with modified firmware supporting v1.0 of the dCS suggested standard. https://www.xcore.com/projects/dsd-audio-over-usb OS is ARM linux. So far I haven't gotten it to work. I noticed that you make mention of: http://www.dcsltd.co.uk/page/assets/DSDoverUSB.pdf Have you applied the marker bytes as described in the PDF or the updated marker bytes refered to in the latest v1.0 spec below? http://www.audiostream.com/content/usb-link-dsd-audio-pcm-frames-andres-koch Thanks -- This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure ___ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
