Package: release.debian.org Severity: normal Tags: buster User: [email protected] Usertags: pu
Hello, I have uploaded the attached change for buster. The story dates back with #697637 and LP #1208826 which noted that speech dispatcher requests very low latency (1ms) from pulseaudio to get the maximum snappiness of speech feedback. This was frowned upon as eating more CPU than needed, and patched over to increase the request to 20ms in version 0.8-1 of speech-dispatcher, as well as in upstream. That patch however was not complete, it missed the attached change to actually change the configuration default, so the requested latency remained 1ms by default. This was not so much a problem beyond a bit more battery drain so far. But with more recent releases of pulseaudio, apparently data transfer management with ALSA got bogus, to the point that this 1ms request is currently making pulseaudio step over itself, which I reported upstream: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/871 The end-user visible result is that on computer start, the speech is disturbed, scratchy, making it unusable, we have heard this with various audio cards. This solves over time, once pulseaudio determines that it gets underruns and should increase the latency beyond 1ms, but that can take from seconds to minutes, thus really a pain for the user who just wants to use the computer. I have proposed to upstream some patch to try to detect the underruns more quickly, but I don't know pulseaudio enough to determine whether it is safe. That's why I'm proposing to just really increase the latency request in speech-dispatcher (as was already planned to save battery) to avoid the pulseaudio bug in Buster. Samuel -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'stable-debug'), (500, 'proposed-updates-debug'), (500, 'proposed-updates'), (500, 'oldstable-proposed-updates-debug'), (500, 'oldstable-proposed-updates'), (500, 'oldoldstable'), (500, 'buildd-unstable'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental-debug'), (1, 'buildd-experimental'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.6.0 (SMP w/8 CPU cores) Kernel taint flags: TAINT_OOT_MODULE Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)
diff -Nru speech-dispatcher-0.9.0/debian/changelog speech-dispatcher-0.9.0/debian/changelog --- speech-dispatcher-0.9.0/debian/changelog 2019-02-20 13:22:57.000000000 +0100 +++ speech-dispatcher-0.9.0/debian/changelog 2020-05-02 12:05:06.000000000 +0200 @@ -1,3 +1,10 @@ +speech-dispatcher (0.9.0-5+deb10u1) buster; urgency=medium + + * patches/pulseaudio-latency: Fix default pulseaudio latency which triggers + pulseaudio scratchy output. + + -- Samuel Thibault <[email protected]> Sat, 02 May 2020 12:05:06 +0200 + speech-dispatcher (0.9.0-5) unstable; urgency=medium * control: Do not require exactly the same binary version of diff -Nru speech-dispatcher-0.9.0/debian/patches/pulseaudio-latency speech-dispatcher-0.9.0/debian/patches/pulseaudio-latency --- speech-dispatcher-0.9.0/debian/patches/pulseaudio-latency 1970-01-01 01:00:00.000000000 +0100 +++ speech-dispatcher-0.9.0/debian/patches/pulseaudio-latency 2020-05-02 12:00:39.000000000 +0200 @@ -0,0 +1,13 @@ +diff --git a/src/server/configuration.c b/src/server/configuration.c +index 2d6cfaca..3623e342 100644 +--- a/src/server/configuration.c ++++ b/src/server/configuration.c +@@ -473,7 +473,7 @@ void load_default_global_set_options() + GlobalFDSet.audio_alsa_device = g_strdup("default"); + GlobalFDSet.audio_nas_server = g_strdup("tcp/localhost:5450"); + GlobalFDSet.audio_pulse_server = g_strdup("default"); +- GlobalFDSet.audio_pulse_min_length = 100; ++ GlobalFDSet.audio_pulse_min_length = 1764; + + SpeechdOptions.max_history_messages = 10000; + diff -Nru speech-dispatcher-0.9.0/debian/patches/series speech-dispatcher-0.9.0/debian/patches/series --- speech-dispatcher-0.9.0/debian/patches/series 2019-02-20 13:22:53.000000000 +0100 +++ speech-dispatcher-0.9.0/debian/patches/series 2020-05-02 12:00:48.000000000 +0200 @@ -2,3 +2,4 @@ systemd-debian mbrola-paths ibmtts-shim +pulseaudio-latency
