<div dir="ltr">Hello, I am experiencing high CPU usage of Pulseaudio in the following setup and I would greatly appreciate any help in identifying the reason for it: I am running the Android Emulator (which runs on Qemu) with Pulseaudio as the audio backend on a Ubuntu 18.04 docker container. I am creating two null sinks in Pulseaudio prior to running the emulator: /etc/pulse/<a href="http://default.pa">default.pa</a>: load-module module-null-sink sink_name=emu_audio_out sink_properties=device.description=emu_audio_out format=s16le rate=48000 channels=2 channel_map=front-left,front-right load-module module-null-sink sink_name=emu_audio_in sink_properties=device.description=emu_audio_out format=s16le rate=48000 channels=2 channel_map=front-left,front-right load-module module-native-protocol-unix auth-anonymous=1 socket=/tmp/pulse-socket load-module module-native-protocol-tcp auth-anonymous=1 and then use the monitors on each of them to redirect the input/output. Then pass the source and sink to Qemu: QEMU_AUDIO_DRV=pa QEMU_PA_SINK=emu_audio_out QEMU_PA_SOURCE=emu_audio_in.monitor QEMU_AUDIO_DAC_FIXED_FREQ=48000 QEMU_AUDIO_ADC_FIXED_FREQ=48000 At the other end I have a small program (called simple_pa_prog) that uses the pa_simple interface to write to emu_audio_in and read from emu_audio_out.monitor (<a href="http://application.name">application.name</a> in the logs are PulseaudioSinkWriter and PulseaudioSinkReader). I do not need to output the audio on the machine's speaker. I am just using Pulseaudio to basically route the sound from/to qemu to/from my pa_simple - enable program. This works well, I can send/receive data successfully to/from my program. The problem that I am facing is that pulseaudio uses anywhere from 15% to 30% of my CPUs (on a Xeon 3.50GHz). I don't understand for the life of me what is the reason for this. There is no resampling involved (see log output below), just moving data around. I have trialed and errored pretty much everything that I could without success (for example playing with qemu's options - QEMU_AUDIO_TIMER_PERIOD, QEMU_AUDIO_ADC_TRY_POLL etc). Pulseaudio's CPU usage stays more or less the same. The whole thing runs in a Docker container - thus the reason for the first pulseaudio warning: This program is not intended to be run as root (unless --system is specified) but the same thing happens on bare metal. I would appreciate any help on how I could identify (and possibly solve) the high cpu usage of Pulseaudio in this setup. ---------------------------- $ pulseaudio -vvvvv ( 0.000| 0.000) W: [pulseaudio] main.c: This program is not intended to be run as root (unless --system is specified). ( 0.001| 0.001) I: [pulseaudio] main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted ( 0.001| 0.000) I: [pulseaudio] main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted ( 0.001| 0.000) D: [pulseaudio] core-rtclock.c: Timer slack is set to 50 us. ( 0.001| 0.000) I: [pulseaudio] main.c: This is PulseAudio 11.1 ( 0.001| 0.000) D: [pulseaudio] main.c: Compilation host: x86_64-pc-linux-gnu ( 0.001| 0.000) D: [pulseaudio] main.c: Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/pulseaudio-ZAagCs/pulseaudio-11.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -W -Wextra -pipe -Wno-long-long -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wcast-align -Wstrict-aliasing -Wwrite-strings -Wno-unused-parameter -ffast-math -fno-common -fdiagnostics-show-option -fdiagnostics-color=auto ( 0.001| 0.000) D: [pulseaudio] main.c: Running on host: Linux x86_64 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 ( 0.001| 0.000) D: [pulseaudio] main.c: Found 8 CPUs. ( 0.001| 0.000) I: [pulseaudio] main.c: Page size is 4096 bytes ( 0.001| 0.000) D: [pulseaudio] main.c: Compiled with Valgrind support: no ( 0.001| 0.000) D: [pulseaudio] main.c: Running in valgrind mode: no ( 0.001| 0.000) D: [pulseaudio] main.c: Running in VM: no ( 0.001| 0.000) D: [pulseaudio] main.c: Optimized build: yes ( 0.001| 0.000) D: [pulseaudio] main.c: FASTPATH defined, only fast path asserts disabled. ( 0.001| 0.000) I: [pulseaudio] main.c: Machine ID is b7e637a7805b. ( 0.001| 0.000) I: [pulseaudio] main.c: Using runtime directory /root/.config/pulse/b7e637a7805b-runtime. ( 0.001| 0.000) I: [pulseaudio] main.c: Using state directory /root/.config/pulse. ( 0.001| 0.000) I: [pulseaudio] main.c: Using modules directory /usr/lib/pulse-11.1/modules. ( 0.001| 0.000) I: [pulseaudio] main.c: Running in system mode: no ( 0.001| 0.000) I: [pulseaudio] main.c: System supports high resolution timers ( 0.003| 0.001) D: [pulseaudio] memblock.c: Using shared memfd memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472 ( 0.003| 0.000) I: [pulseaudio] cpu-x86.c: CPU flags: CMOV MMX SSE SSE2 SSE3 SSSE3 SSE4_1 SSE4_2 ( 0.003| 0.000) I: [pulseaudio] svolume_mmx.c: Initialising MMX optimized volume functions. ( 0.003| 0.000) I: [pulseaudio] remap_mmx.c: Initialising MMX optimized remappers. ( 0.003| 0.000) I: [pulseaudio] svolume_sse.c: Initialising SSE2 optimized volume functions. ( 0.003| 0.000) I: [pulseaudio] remap_sse.c: Initialising SSE2 optimized remappers. ( 0.003| 0.000) I: [pulseaudio] sconv_sse.c: Initialising SSE2 optimized conversions. ( 0.003| 0.000) I: [pulseaudio] svolume_orc.c: Initialising ORC optimized volume functions. ( 0.005| 0.001) W: [pulseaudio] sink.c: Default and alternate sample rates are the same. ( 0.005| 0.000) I: [pulseaudio] sink.c: Created sink 0 "emu_audio_out" with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 0.005| 0.000) I: [pulseaudio] sink.c: device.description = "emu_audio_out" ( 0.005| 0.000) I: [pulseaudio] sink.c: device.class = "abstract" ( 0.005| 0.000) I: [pulseaudio] sink.c: device.icon_name = "audio-card" ( 0.005| 0.000) I: [pulseaudio] source.c: Created source 0 "emu_audio_out.monitor" with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 0.005| 0.000) I: [pulseaudio] source.c: device.description = "Monitor of emu_audio_out" ( 0.005| 0.000) I: [pulseaudio] source.c: device.class = "monitor" ( 0.005| 0.000) I: [pulseaudio] source.c: device.icon_name = "audio-input-microphone" ( 0.006| 0.000) D: [null-sink] module-null-sink.c: Thread starting up ( 0.006| 0.000) I: [pulseaudio] core.c: default_source: (unset) -> emu_audio_out.monitor ( 0.006| 0.000) I: [pulseaudio] core.c: default_sink: (unset) -> emu_audio_out ( 0.006| 0.000) I: [pulseaudio] module.c: Loaded "module-null-sink" (index: #0; argument: "sink_name=emu_audio_out sink_properties=device.description=emu_audio_out format=s16le rate=48000 channels=2 channel_map=front-left,front-right "). ( 0.006| 0.000) W: [pulseaudio] sink.c: Default and alternate sample rates are the same. ( 0.006| 0.000) I: [pulseaudio] sink.c: Created sink 1 "emu_audio_in" with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 0.006| 0.000) I: [pulseaudio] sink.c: device.description = "emu_audio_in" ( 0.006| 0.000) I: [pulseaudio] sink.c: device.class = "abstract" ( 0.006| 0.000) I: [pulseaudio] sink.c: device.icon_name = "audio-card" ( 0.006| 0.000) I: [pulseaudio] source.c: Created source 1 "emu_audio_in.monitor" with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 0.006| 0.000) I: [pulseaudio] source.c: device.description = "Monitor of emu_audio_in" ( 0.006| 0.000) I: [pulseaudio] source.c: device.class = "monitor" ( 0.006| 0.000) I: [pulseaudio] source.c: device.icon_name = "audio-input-microphone" ( 0.006| 0.000) D: [null-sink] module-null-sink.c: Thread starting up ( 0.006| 0.000) I: [pulseaudio] module.c: Loaded "module-null-sink" (index: #1; argument: "sink_name=emu_audio_in sink_properties=device.description=emu_audio_in format=s16le rate=48000 channels=2 channel_map=front-left,front-right "). ( 0.009| 0.002) W: [pulseaudio] authkey.c: Failed to open cookie file '/root/.config/pulse/cookie': No such file or directory ( 0.009| 0.000) W: [pulseaudio] authkey.c: Failed to load authentication key '/root/.config/pulse/cookie': No such file or directory ( 0.009| 0.000) W: [pulseaudio] authkey.c: Failed to open cookie file '/root/.pulse-cookie': No such file or directory ( 0.009| 0.000) W: [pulseaudio] authkey.c: Failed to load authentication key '/root/.pulse-cookie': No such file or directory ( 0.009| 0.000) D: [pulseaudio] authkey.c: Got 0 bytes from cookie file '/root/.config/pulse/cookie', expected 256 ( 0.009| 0.000) I: [pulseaudio] module.c: Loaded "module-native-protocol-unix" (index: #2; argument: "auth-anonymous=1 socket=/tmp/pulse-socket"). ( 0.010| 0.001) I: [pulseaudio] module.c: Loaded "module-native-protocol-tcp" (index: #3; argument: "auth-anonymous=1"). ( 0.011| 0.000) W: [pulseaudio] server-lookup.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.InvalidFileContent: D-Bus library appears to be incorrectly set up: see the manual page for dbus-uuidgen to correct this issue. (Failed to open "/var/lib/dbus/machine-id": No such file or directory; UUID file '/etc/machine-id' should contain a hex string of length 32, not length 0, with no other text) ( 0.011| 0.000) W: [pulseaudio] main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.InvalidFileContent: D-Bus library appears to be incorrectly set up: see the manual page for dbus-uuidgen to correct this issue. (Failed to open "/var/lib/dbus/machine-id": No such file or directory; UUID file '/etc/machine-id' should contain a hex string of length 32, not length 0, with no other text) ( 0.011| 0.000) I: [pulseaudio] main.c: Daemon startup complete. ( 0.011| 0.011) I: [pulseaudio] main.c: Daemon startup successful. ( 0.016| 0.005) I: [pulseaudio] client.c: Created 0 "Native client (UNIX socket client)" ( 0.016| 0.000) I: [pulseaudio] protocol-native.c: Client authenticated anonymously. ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Protocol version: remote 32, local 32 ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: SHM possible: yes ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM: yes ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Memfd possible: yes ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM type: shared memfd ( 0.017| 0.000) D: [pulseaudio] memblock.c: Using shared memfd memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472 ( 0.017| 0.000) D: [pulseaudio] srbchannel.c: SHM block is 65472 bytes, ringbuffer capacity is 2 * 32712 bytes ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Enabling srbchannel... ( 0.017| 0.000) D: [pulseaudio] protocol-native.c: Client enabled srbchannel. ( 0.019| 0.002) I: [pulseaudio] client.c: Freed 0 "pactl" ( 0.019| 0.000) I: [pulseaudio] protocol-native.c: Connection died. ( 3.179| 3.159) I: [pulseaudio] client.c: Created 1 "Native client (UNIX socket client)" ( 3.179| 0.000) I: [pulseaudio] protocol-native.c: Client authenticated anonymously. ( 3.179| 0.000) D: [pulseaudio] protocol-native.c: Protocol version: remote 32, local 32 ( 3.179| 0.000) D: [pulseaudio] protocol-native.c: SHM possible: yes ( 3.179| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM: yes ( 3.179| 0.000) D: [pulseaudio] protocol-native.c: Memfd possible: yes ( 3.179| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM type: shared memfd ( 3.179| 0.000) D: [pulseaudio] memblock.c: Using shared memfd memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472 ( 3.179| 0.000) D: [pulseaudio] srbchannel.c: SHM block is 65472 bytes, ringbuffer capacity is 2 * 32712 bytes ( 3.180| 0.000) D: [pulseaudio] protocol-native.c: Enabling srbchannel... ( 3.180| 0.000) D: [pulseaudio] protocol-native.c: Client enabled srbchannel. ( 3.180| 0.000) D: [pulseaudio] sink-input.c: Negotiated format: pcm, format.sample_format = "\"s16le\"" format.rate = "48000" format.channels = "2" format.channel_map = "\"front-left,front-right\"" ( 3.180| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 ( 3.180| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 ( 3.180| 0.000) I: [pulseaudio] sink-input.c: Created input 0 "playback" on emu_audio_out with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 3.180| 0.000) I: [pulseaudio] sink-input.c: <a href="http://media.name">media.name</a> = "playback" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: <a href="http://application.name">application.name</a> = "PulseaudioSinkWriter" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: native-protocol.peer = "UNIX socket client" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: native-protocol.version = "32" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: <a href="http://application.process.id">application.process.id</a> = "1" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: application.process.user = "root" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: application.process.host = "b7e637a7805b" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: application.process.binary = "simple_pa_prog" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: application.language = "C" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: window.x11.display = ":0" ( 3.180| 0.000) I: [pulseaudio] sink-input.c: application.process.machine_id = "b7e637a7805b" ( 3.180| 0.000) I: [pulseaudio] protocol-native.c: Requested tlength=250.00 ms, minreq=20.00 ms ( 3.180| 0.000) D: [pulseaudio] protocol-native.c: Adjust latency mode enabled, configuring sink latency to half of overall latency. ( 3.180| 0.000) D: [pulseaudio] protocol-native.c: Requested latency=105.00 ms, Received latency=105.00 ms ( 3.180| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=4194304, tlength=27840, base=4, prebuf=24004, minreq=3840 maxrewind=0 ( 3.180| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=4194304, tlength=27840, base=4, prebuf=24004, minreq=3840 maxrewind=0 ( 3.180| 0.000) I: [pulseaudio] protocol-native.c: Final latency 250.00 ms = 105.00 ms + 2*20.00 ms + 105.00 ms ( 3.181| 0.001) I: [pulseaudio] client.c: Created 2 "Native client (UNIX socket client)" ( 3.182| 0.000) I: [pulseaudio] protocol-native.c: Client authenticated anonymously. ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Protocol version: remote 32, local 32 ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: SHM possible: yes ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM: yes ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Memfd possible: yes ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM type: shared memfd ( 3.182| 0.000) D: [pulseaudio] memblock.c: Using shared memfd memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472 ( 3.182| 0.000) D: [pulseaudio] srbchannel.c: SHM block is 65472 bytes, ringbuffer capacity is 2 * 32712 bytes ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Enabling srbchannel... ( 3.182| 0.000) D: [pulseaudio] protocol-native.c: Client enabled srbchannel. ( 3.182| 0.000) D: [pulseaudio] source-output.c: Negotiated format: pcm, format.sample_format = "\"s16le\"" format.rate = "48000" format.channels = "2" format.channel_map = "\"front-left,front-right\"" ( 3.182| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 ( 3.182| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 ( 3.182| 0.000) I: [pulseaudio] source-output.c: Created output 0 "record" on emu_audio_in.monitor with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 3.182| 0.000) I: [pulseaudio] source-output.c: <a href="http://media.name">media.name</a> = "record" ( 3.182| 0.000) I: [pulseaudio] source-output.c: <a href="http://application.name">application.name</a> = "PulseaudioSinkReader" ( 3.182| 0.000) I: [pulseaudio] source-output.c: native-protocol.peer = "UNIX socket client" ( 3.182| 0.000) I: [pulseaudio] source-output.c: native-protocol.version = "32" ( 3.182| 0.000) I: [pulseaudio] source-output.c: <a href="http://application.process.id">application.process.id</a> = "1" ( 3.182| 0.000) I: [pulseaudio] source-output.c: application.process.user = "root" ( 3.182| 0.000) I: [pulseaudio] source-output.c: application.process.host = "b7e637a7805b" ( 3.182| 0.000) I: [pulseaudio] source-output.c: application.process.binary = "simple_pa_prog" ( 3.182| 0.000) I: [pulseaudio] source-output.c: application.language = "C" ( 3.182| 0.000) I: [pulseaudio] source-output.c: window.x11.display = ":0" ( 3.182| 0.000) I: [pulseaudio] source-output.c: application.process.machine_id = "b7e637a7805b" ( 3.183| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=4194304, tlength=0, base=4, prebuf=1, minreq=0 maxrewind=0 ( 3.183| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=4194304, tlength=4194304, base=4, prebuf=4, minreq=4 maxrewind=0 ( 3.183| 0.000) I: [pulseaudio] protocol-native.c: Final latency 4000.00 ms = 2000.00 ms + 2000.00 ms ( 3.946| 0.762) I: [pulseaudio] client.c: Created 3 "Native client (UNIX socket client)" ( 3.946| 0.000) I: [pulseaudio] protocol-native.c: Client authenticated anonymously. ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Protocol version: remote 32, local 32 ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: SHM possible: yes ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM: yes ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Memfd possible: yes ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Negotiated SHM type: shared memfd ( 3.946| 0.000) D: [pulseaudio] memblock.c: Using shared memfd memory pool with 1024 slots of size 64.0 KiB each, total size is 64.0 MiB, maximum usable slot size is 65472 ( 3.946| 0.000) D: [pulseaudio] srbchannel.c: SHM block is 65472 bytes, ringbuffer capacity is 2 * 32712 bytes ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Enabling srbchannel... ( 3.946| 0.000) D: [pulseaudio] protocol-native.c: Client enabled srbchannel. ( 3.947| 0.000) D: [pulseaudio] sink-input.c: Negotiated format: pcm, format.sample_format = "\"s16le\"" format.rate = "48000" format.channels = "2" format.channel_map = "\"front-left,front-right\"" ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 ( 3.947| 0.000) I: [pulseaudio] sink-input.c: Created input 1 "qemu" on emu_audio_in with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 3.947| 0.000) I: [pulseaudio] sink-input.c: <a href="http://media.name">media.name</a> = "qemu" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: <a href="http://application.name">application.name</a> = "unix:/tmp/pulse-socket" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: native-protocol.peer = "UNIX socket client" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: native-protocol.version = "32" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: <a href="http://application.process.id">application.process.id</a> = "52" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: application.process.user = "root" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: application.process.host = "b7e637a7805b" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: application.process.binary = "qemu-system-x86_64" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: application.language = "C" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: window.x11.display = ":0" ( 3.947| 0.000) I: [pulseaudio] sink-input.c: application.process.machine_id = "b7e637a7805b" ( 3.947| 0.000) I: [pulseaudio] protocol-native.c: Requested tlength=10.00 ms, minreq=5.00 ms ( 3.947| 0.000) D: [pulseaudio] protocol-native.c: Adjust latency mode enabled, configuring sink latency to half of overall latency. ( 3.947| 0.000) D: [pulseaudio] protocol-native.c: Requested latency=0.00 ms, Received latency=0.50 ms ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=4194304, tlength=2016, base=4, prebuf=1060, minreq=960 maxrewind=0 ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=4194304, tlength=2016, base=4, prebuf=1060, minreq=960 maxrewind=0 ( 3.947| 0.000) I: [pulseaudio] protocol-native.c: Final latency 11.00 ms = 0.50 ms + 2*5.00 ms + 0.50 ms ( 3.947| 0.000) D: [pulseaudio] source-output.c: Negotiated format: pcm, format.sample_format = "\"s16le\"" format.rate = "48000" format.channels = "2" format.channel_map = "\"front-left,front-right\"" ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 ( 3.947| 0.000) I: [pulseaudio] source-output.c: Created output 1 "qemu" on emu_audio_out.monitor with sample spec s16le 2ch 48000Hz and channel map front-left,front-right ( 3.947| 0.000) I: [pulseaudio] source-output.c: <a href="http://media.name">media.name</a> = "qemu" ( 3.947| 0.000) I: [pulseaudio] source-output.c: <a href="http://application.name">application.name</a> = "unix:/tmp/pulse-socket" ( 3.947| 0.000) I: [pulseaudio] source-output.c: native-protocol.peer = "UNIX socket client" ( 3.947| 0.000) I: [pulseaudio] source-output.c: native-protocol.version = "32" ( 3.947| 0.000) I: [pulseaudio] source-output.c: <a href="http://application.process.id">application.process.id</a> = "52" ( 3.947| 0.000) I: [pulseaudio] source-output.c: application.process.user = "root" ( 3.947| 0.000) I: [pulseaudio] source-output.c: application.process.host = "b7e637a7805b" ( 3.947| 0.000) I: [pulseaudio] source-output.c: application.process.binary = "qemu-system-x86_64" ( 3.947| 0.000) I: [pulseaudio] source-output.c: application.language = "C" ( 3.947| 0.000) I: [pulseaudio] source-output.c: window.x11.display = ":0" ( 3.947| 0.000) I: [pulseaudio] source-output.c: application.process.machine_id = "b7e637a7805b" ( 3.947| 0.000) D: [pulseaudio] memblockq.c: memblockq requested: maxlength=4194304, tlength=0, base=4, prebuf=1, minreq=0 maxrewind=0 ( 3.948| 0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=4194304, tlength=4194304, base=4, prebuf=4, minreq=4 maxrewind=0 ( 3.948| 0.000) I: [pulseaudio] protocol-native.c: Final latency 20.00 ms = 10.00 ms + 10.00 ms ( 5.639| 1.691) D: [pulseaudio] protocol-native.c: Client qemu-system-x86_64 changes volume of sink input qemu. ( 5.639| 0.000) D: [pulseaudio] sink-input.c: The volume of sink input 1 changed from front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB to front-left: 0 / 0% / -inf dB, front-right: 65536 / 100% / 0.00 dB. ( 5.639| 0.000) D: [pulseaudio] sink-input.c: Sink input 1 reference ratio changed from front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB to front-left: 0 / 0% / -inf dB, front-right: 65536 / 100% / 0.00 dB. ( 5.639| 0.000) D: [pulseaudio] protocol-native.c: Client qemu-system-x86_64 changes mute of sink input qemu. ( 5.640| 0.000) D: [pulseaudio] protocol-native.c: Client qemu-system-x86_64 changes volume of sink input qemu. ( 5.640| 0.000) D: [pulseaudio] sink-input.c: The volume of sink input 1 changed from front-left: 0 / 0% / -inf dB, front-right: 65536 / 100% / 0.00 dB to front-left: 0 / 0% / -inf dB, front-right: 0 / 0% / -inf dB. [truncated] --------------- $ pacmd list Memory blocks currently allocated: 1, size: 63.9 KiB. Memory blocks allocated during the whole lifetime: 3773, size: 738.2 KiB. Memory blocks imported from other processes: 0, size: 0 B. Memory blocks exported to other processes: 128, size: 8.0 MiB. Total sample cache size: 0 B. Default sample spec: s16le 2ch 48000Hz Default channel map: front-left,front-right Default sink name: emu_audio_out Default source name: emu_audio_out.monitor Memory blocks of type POOL: 1 allocated/3773 accumulated. Memory blocks of type POOL_EXTERNAL: 0 allocated/0 accumulated. Memory blocks of type APPENDED: 0 allocated/0 accumulated. Memory blocks of type USER: 0 allocated/0 accumulated. Memory blocks of type FIXED: 0 allocated/0 accumulated. Memory blocks of type IMPORTED: 0 allocated/0 accumulated. 5 module(s) loaded. index: 0 name: <module-null-sink> argument: <sink_name=emu_audio_out sink_properties=device.description=emu_audio_out format=s16le rate=48000 channels=2 channel_map=front-left,front-right > used: 2 load once: no properties: module.author = "Lennart Poettering" module.description = "Clocked NULL sink" module.version = "11.1" index: 1 name: <module-null-sink> argument: <sink_name=emu_audio_in sink_properties=device.description=emu_audio_in format=s16le rate=48000 channels=2 channel_map=front-left,front-right > used: 2 load once: no properties: module.author = "Lennart Poettering" module.description = "Clocked NULL sink" module.version = "11.1" index: 2 name: <module-native-protocol-unix> argument: <auth-anonymous=1 socket=/tmp/pulse-socket> used: -1 load once: no properties: module.author = "Lennart Poettering" module.description = "Native protocol (UNIX sockets)" module.version = "11.1" index: 3 name: <module-native-protocol-tcp> argument: <auth-anonymous=1> used: -1 load once: no properties: module.author = "Lennart Poettering" module.description = "Native protocol (TCP sockets)" module.version = "11.1" index: 4 name: <module-cli-protocol-unix> argument: <> used: -1 load once: no properties: module.author = "Lennart Poettering" module.description = "Command line interface protocol (UNIX sockets)" module.version = "11.1" 2 sink(s) available. * index: 0 name: <emu_audio_out> driver: <module-null-sink.c> flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: RUNNING suspend cause: priority: 1000 volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 base volume: 65536 / 100% / 0.00 dB volume steps: 65537 muted: no current latency: 5.73 ms max request: 1 KiB max rewind: 1 KiB monitor source: 0 sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo used by: 1 linked by: 2 configured latency: 10.00 ms; range is 0.50 .. 2000.00 ms module: 0 properties: device.description = "emu_audio_out" device.class = "abstract" device.icon_name = "audio-card" index: 1 name: <emu_audio_in> driver: <module-null-sink.c> flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: RUNNING suspend cause: priority: 1000 volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 base volume: 65536 / 100% / 0.00 dB volume steps: 65537 muted: no current latency: 0.04 ms max request: 0 KiB max rewind: 0 KiB monitor source: 1 sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo used by: 1 linked by: 2 configured latency: 0.50 ms; range is 0.50 .. 2000.00 ms module: 1 properties: device.description = "emu_audio_in" device.class = "abstract" device.icon_name = "audio-card" 2 source(s) available. * index: 0 name: <emu_audio_out.monitor> driver: <module-null-sink.c> flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: IDLE suspend cause: priority: 1000 volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 base volume: 65536 / 100% / 0.00 dB volume steps: 65537 muted: no current latency: 0.00 ms max rewind: 1 KiB sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo used by: 0 linked by: 1 configured latency: 10.00 ms; range is 0.50 .. 2000.00 ms monitor_of: 0 module: 0 properties: device.description = "Monitor of emu_audio_out" device.class = "monitor" device.icon_name = "audio-input-microphone" index: 1 name: <emu_audio_in.monitor> driver: <module-null-sink.c> flags: DECIBEL_VOLUME LATENCY DYNAMIC_LATENCY state: RUNNING suspend cause: priority: 1000 volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 base volume: 65536 / 100% / 0.00 dB volume steps: 65537 muted: no current latency: 0.00 ms max rewind: 0 KiB sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo used by: 1 linked by: 1 configured latency: 2000.00 ms; range is 0.50 .. 2000.00 ms monitor_of: 1 module: 1 properties: device.description = "Monitor of emu_audio_in" device.class = "monitor" device.icon_name = "audio-input-microphone" 4 client(s) logged in. index: 1 driver: <protocol-native.c> owner module: 2 properties: <a href="http://application.name">application.name</a> = "PulseaudioSinkWriter" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "1" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "simple_pa_prog" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" index: 2 driver: <protocol-native.c> owner module: 2 properties: <a href="http://application.name">application.name</a> = "PulseaudioSinkReader" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "1" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "simple_pa_prog" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" index: 3 driver: <protocol-native.c> owner module: 2 properties: <a href="http://application.name">application.name</a> = "unix:/tmp/pulse-socket" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "52" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "qemu-system-x86_64" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" index: 5 driver: <cli.c> owner module: 4 properties: <a href="http://application.name">application.name</a> = "UNIX socket client" 0 card(s) available. 2 sink input(s) available. index: 0 driver: <protocol-native.c> flags: state: DRAINED sink: 0 <emu_audio_out> volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 muted: no current latency: 0.00 ms requested latency: 105.00 ms sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo resample method: (null) module: 2 client: 1 <PulseaudioSinkWriter> properties: <a href="http://media.name">media.name</a> = "playback" <a href="http://application.name">application.name</a> = "PulseaudioSinkWriter" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "1" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "simple_pa_prog" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" index: 1 driver: <protocol-native.c> flags: state: DRAINED sink: 1 <emu_audio_in> volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 muted: no current latency: 0.00 ms requested latency: 0.50 ms sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo resample method: (null) module: 2 client: 3 <unix:/tmp/pulse-socket> properties: <a href="http://media.name">media.name</a> = "qemu" <a href="http://application.name">application.name</a> = "unix:/tmp/pulse-socket" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "52" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "qemu-system-x86_64" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" 2 source output(s) available. index: 0 driver: <protocol-native.c> flags: state: RUNNING source: 1 <emu_audio_in.monitor> volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 muted: no current latency: 0.00 ms requested latency: 2000.00 ms sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo resample method: (null) owner module: 2 client: 2 <PulseaudioSinkReader> properties: <a href="http://media.name">media.name</a> = "record" <a href="http://application.name">application.name</a> = "PulseaudioSinkReader" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "1" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "simple_pa_prog" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" index: 1 driver: <protocol-native.c> flags: START_CORKED state: CORKED source: 0 <emu_audio_out.monitor> volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB balance 0.00 muted: no current latency: 0.00 ms requested latency: 10.00 ms sample spec: s16le 2ch 48000Hz channel map: front-left,front-right Stereo resample method: (null) owner module: 2 client: 3 <unix:/tmp/pulse-socket> properties: <a href="http://media.name">media.name</a> = "qemu" <a href="http://application.name">application.name</a> = "unix:/tmp/pulse-socket" native-protocol.peer = "UNIX socket client" native-protocol.version = "32" <a href="http://application.process.id">application.process.id</a> = "52" application.process.user = "root" application.process.host = "46ff4ed03788" application.process.binary = "qemu-system-x86_64" application.language = "C" window.x11.display = ":0" application.process.machine_id = "46ff4ed03788" 0 cache entrie(s) available.</div>