On 6/4/2012 3:02 μμ, adel...@freemail.gr wrote:
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.
There seems to be an issue with 24bit wav files though. Lots of noise
during playback.
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