Add the interpolation threshold setting.

diff --git a/common.h b/common.h
index c42d76a37348eb03e21c958cf76cab7557ea4185..4e2fb65a66c40c1a91c247d5e87276cd352b1624 100644 (file)
--- a/common.h
+++ b/common.h
@@ -168,6 +168,7 @@ typedef struct {
   int interface_index; // only valid if the interface string is non-NULL
   double audio_backend_buffer_desired_length; // this will be the length in seconds of the
                                               // audio backend buffer -- the DAC buffer for ALSA
+  double audio_backend_buffer_interpolation_threshold_in_seconds; // below this, soxr interpolation will not occur -- it'll be basic interpolation instead.
   double audio_backend_latency_offset; // this will be the offset in seconds to compensate for any
                                        // fixed latency there might be in the audio path
   double audio_backend_silent_lead_in_time; // the length of the silence that should precede a play.

diff --git a/scripts/shairport-sync.conf b/scripts/shairport-sync.conf
index 39db80778e9011e703dc25cefaa3e892a685e664..b34c84555785adf94c96213da4cbcb6e86f68ce2 100644 (file)
--- a/scripts/shairport-sync.conf
+++ b/scripts/shairport-sync.conf
@@ -41,6 +41,7 @@ general =
 
 //     audio_backend_latency_offset_in_seconds = 0.0; // Set this offset to compensate for a fixed delay in the audio back end. E.g. if the output device delays by 100 ms, set this to -0.1.
 //     audio_backend_buffer_desired_length_in_seconds = 0.15; // If set too small, buffer underflow occurs on low-powered machines. Too long and the response time to volume changes becomes annoying. Default is 0.15 seconds in the alsa backend, 0.35 seconds in the pa backend and 1.0 seconds otherwise.
+//     audio_backend_buffer_interpolation_threshold_in_seconds = 0.075; // Advanced feature. If the buffer size drops below this, stop using time-consuming interpolation like soxr to avoid dropouts due to underrun.
 //     audio_backend_silent_lead_in_time = 2.0; // This optional advanced setting, from 0.0 and 4.0 seconds, sets the length of the period of silence that precedes the start of the audio. The default is the latency, usually 2.0 seconds. Values greater than the latency are ignored. Values that are too low will affect initial synchronisation.
 //     dbus_service_bus = "system"; // The Shairport Sync dbus interface, if selected at compilation, will appear
 //             as "org.gnome.ShairportSync" on the whichever bus you specify here: "system" (default) or "session".