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.
diff --git a/src/output/alsa_output_plugin.c b/src/output/alsa_output_plugin.c
index a6dc92f..2a82861 100644
--- a/src/output/alsa_output_plugin.c
+++ b/src/output/alsa_output_plugin.c
@@ -673,7 +673,12 @@ alsa_open(struct audio_output *ao, struct audio_format *audio_format, GError **e
return false;
}
- ad-in_frame_size = audio_format_frame_size(audio_format);
+ if (ad-export.shift8) {
+ g_warning(Adjusting in_frame_size for DSD-over-USB output\n);
+ ad-in_frame_size = ad-export.shift8 ? 8 : ad-in_frame_size;
+ } else {
+ ad-in_frame_size = audio_format_frame_size(audio_format);
+ }
ad-out_frame_size = ad-export.pack24 ? 3 : ad-in_frame_size;
return true;
--
1.7.6.5
--
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