Kazam+PulseAudio组合几乎成了所有Linux发布版的屏幕录制+声音采集的首选工具，但到了Ubuntu 20.04之后。 Kazam潜在一个Bug，那就是在“首选项”下，我看不到“扬声器”和“麦克风”。那么导致你在录制过程中无法同步采集声音。
如果你对Kazam的源代码了解的话，它底层还是基于Python写的，其音频模块位于如下路径的
/usr/lib/python3/dist-packages/kazam/pulseaudio/pulseaudio.py
造成该bug的原因是原pulseaudio.py模块中的相关代码仍然调用time.clock()函数。 但从Python3.3起该函数已弃用，并且Ubuntu20.04操作系统已经默认预装python3.7+，那么修复该Bug非常简单，只要模块中的所有time.clock()调用都必须替换为time.perf_counter()
下面是修改好的pulseaudio.py模块的完整代码，只要覆盖原有的模块即可。
# -*- coding: utf-8 -*-
#
# pulseaudio.py
#
# Copyright 2012 David Klasinc <bigwhale@lubica.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
import time
import logging
logger = logging.getLogger("PulseAudio")
from kazam.pulseaudio.error_handling import *
from kazam.backend.prefs import *
try:
from kazam.pulseaudio.ctypes_pulseaudio import *
except:
raise PAError(PA_LOAD_ERROR, "Unable to load pulseaudio wrapper lib. Is PulseAudio installed?")
class pulseaudio_q:
def __init__(self):
"""pulseaudio_q constructor.
Initializes and sets all the necessary startup variables.
Args:
None
Returns:
None
Raises:
None
"""
self.pa_state = -1
self.sources = []
self._sources = []
self._return_result = []
self.pa_status = PA_STOPPED
#
# Making sure that we don't lose references to callback functions
#
self._pa_state_cb = pa_context_notify_cb_t(self.pa_state_cb)
self._pa_sourcelist_cb = pa_source_info_cb_t(self.pa_sourcelist_cb)
self._pa_sourceinfo_cb = pa_source_info_cb_t(self.pa_sourceinfo_cb)
self._pa_context_success_cb = pa_context_success_cb_t(self.pa_context_success_cb)
def pa_context_success_cb(self, context, c_int, user_data):
self._pa_ctx_success = c_int
return
def pa_state_cb(self, context, userdata):
"""Reads PulseAudio context state.
Sets self.pa_state depending on the pa_context_state and
raises an error if unable to get the state from PulseAudio.
Args:
context: PulseAudio context.
userdata: n/a.
Returns:
Zero on success or raises an exception.
Raises:
PAError, PA_GET_STATE_ERROR if pa_context_get_state() failed.
"""
try:
state = pa_context_get_state(context)
if state in [PA_CONTEXT_UNCONNECTED, PA_CONTEXT_CONNECTING, PA_CONTEXT_AUTHORIZING,
PA_CONTEXT_SETTING_NAME]:
self.pa_state = PA_STATE_WORKING
elif state == PA_CONTEXT_FAILED:
self.pa_state = PA_STATE_FAILED
elif state == PA_CONTEXT_READY:
self.pa_state = PA_STATE_READY
logger.debug("State connected.")
except:
raise PAError(PA_GET_STATE_ERROR, "Unable to read context state.")
return 0
def pa_sourcelist_cb(self, context, source_info, eol, userdata):
"""Source list callback function
Called by mainloop thread each time list of audio sources is requested.
All the parameters to this functions are passed to it automatically by
the caller.
Args:
context: PulseAudio context.
source_info: data returned from mainloop.
eol: End Of List marker if set to non-zero there is no more date
to read and we should bail out.
userdata: n/a.
Returns:
self.source_list: Contains list of all Pulse Audio sources.
self.pa_status: PA_WORKING or PA_FINISHED
Raises:
None
"""
if eol == 0:
logger.debug("pa_sourcelist_cb()")
logger.debug(" IDX: {0}".format(source_info.contents.index))
logger.debug(" Name: {0}".format(source_info.contents.name))
logger.debug(" Desc: {0}".format(source_info.contents.description))
self.pa_status = PA_WORKING
self._sources.append([source_info.contents.index,
source_info.contents.name.decode('utf-8'),
" ".join(source_info.contents.description.decode('utf-8').split())])
else:
logger.debug("pa_sourcelist_cb() -- finished")
self.pa_status = PA_FINISHED
return 0
def pa_sourceinfo_cb(self, context, source_info, eol, userdata):
"""Source list callback function
Called by mainloop thread each time info for a single audio source is requestd.
All the parameters to this functions are passed to it automatically by
the caller. This is here for convenience.
Args:
context: PulseAudio context.
index: Source index
source_info: data returned from mainloop.
eol: End Of List marker if set to non-zero there is no more date
to read and we should bail out.
userdata: n/a.
Returns:
self.source_list: Contains list of all Pulse Audio sources.
self.pa_status: PA_WORKING or PA_FINISHED
Raises:
None
"""
if eol == 0:
logger.debug("pa_sourceinfo_cb()")
logger.debug(" IDX: {0}".format(source_info.contents.index))
logger.debug(" Name: {0}".format(source_info.contents.name))
logger.debug(" Desc: {0}".format(source_info.contents.description))
self.pa_status = PA_WORKING
cvolume = pa_cvolume()
v = pa_volume_t * 32
cvolume.channels = source_info.contents.volume.channels
cvolume.values = v()
for i in range(0, source_info.contents.volume.channels):
cvolume.values[i] = source_info.contents.volume.values[i]
self._return_result = [source_info.contents.index,
source_info.contents.name.decode('utf-8'),
cvolume,
" ".join(source_info.contents.description.decode('utf-8').split())]
else:
try:
logger.debug("pa_sourceinfo_cb() -- Hit EOL")
logger.debug(" EOL IDX: {0}".format(source_info.contents.index))
logger.debug(" EOL Name: {0}".format(source_info.contents.name))
logger.debug(" EOL Desc: {0}".format(source_info.contents.description))
except:
logger.debug("pa_sourceinfo_cb() -- EOL no data!")
self.pa_status = PA_FINISHED
logger.debug("pa_sourceinfo_cb() -- finished")
return 0
def start(self):
"""Starts PulseAudio threaded mainloop.
Creates mainloop, mainloop API and context objects and connects
to the PulseAudio server.
Args:
None
Returns:
None
Raises:
PAError, PA_STARTUP_ERROR - if unable to create PA objects.
PAError, PA_UNABLE_TO_CONNECT - if connection to PA fails.
PAError, PA_UNABLE_TO_CONNECT2 - if call to connect() fails.
PAError, PA_MAINLOOP_START_ERROR - if not able to start mainloop.
"""
try:
logger.debug("Starting mainloop.")
self.pa_ml = pa_threaded_mainloop_new()
logger.debug("Getting API.")
self.pa_mlapi = pa_threaded_mainloop_get_api(self.pa_ml)
logger.debug("Setting context.")
self.pa_ctx = pa_context_new(self.pa_mlapi, None)
logger.debug("Set state callback.")
pa_context_set_state_callback(self.pa_ctx, self._pa_state_cb, None)
except:
raise PAError(PA_STARTUP_ERROR, "Unable to access PulseAudio API.")
try:
logger.debug("Connecting to server.")
if pa_context_connect(self.pa_ctx, None, 0, None):
raise PAError(PA_UNABLE_TO_CONNECT, "Unable to connect to PulseAudio server.")
except:
raise PAError(PA_UNABLE_TO_CONNECT2, "Unable to initiate connection to PulseAudio server.")
try:
logger.debug("Start mainloop.")
pa_threaded_mainloop_start(self.pa_ml)
time.sleep(0.1) # Mainloop needs some time to start ...
pa_context_get_state(self.pa_ctx)
except:
raise PAError(PA_MAINLOOP_START_ERROR, "Unable to start mainloop.")
def end(self):
"""Disconnects from PulseAudio server.
Disconnects from PulseAudio server, it should be called after all the
operations are finished.
Args:
None
Returns:
None
Raises:
PAError, PA_MAINLOOP_END_ERROR - if not able to disconnect.
"""
try:
logger.debug("Disconnecting from server.")
pa_context_disconnect(self.pa_ctx)
self.pa_ml = None
self.pa_mlapi = None
self.pa_ctx = None
except:
raise PAError(PA_MAINLOOP_END_ERROR, "Unable to end mainloop.")
def get_audio_sources(self):
try:
logger.debug("get_audio_sources() called.")
pa_context_get_source_info_list(self.pa_ctx, self._pa_sourcelist_cb, None)
t = time.perf_counter()
while time.perf_counter() - t < 5:
if self.pa_status == PA_FINISHED:
self.sources = self._sources
self._sources = []
return self.sources
raise PAError(PA_GET_SOURCES_TIMEOUT, "Unable to get sources, operation timed out.")
except:
logger.debug("Unable to get audio sources.")
raise PAError(PA_GET_SOURCES_ERROR, "Unable to get sources.")
def get_source_info_by_index(self, index):
try:
logger.debug("get_source_info_by_index() called. IDX: {0}".format(index))
pa_context_get_source_info_by_index(self.pa_ctx, index, self._pa_sourceinfo_cb, None)
t = time.perf_counter()
while time.perf_counter() - t < 5:
if self.pa_status == PA_FINISHED:
time.sleep(0.1)
ret = self._return_result
self._return_result = []
return ret
raise PAError(PA_GET_SOURCE_TIMEOUT, "Unable to get source, operation timed out.")
except:
raise PAError(PA_GET_SOURCE_ERROR, "Unable to get source.")
def set_source_volume_by_index(self, index, cvolume):
try:
pa_context_set_source_volume_by_index(self.pa_ctx, index, cvolume,
self._pa_context_success_cb, None)
t = time.perf_counter()
while time.perf_counter() - t < 5:
if self.pa_status == PA_FINISHED:
return 1
raise PAError(PA_GET_SOURCES_TIMEOUT, "Unable to get sources, operation timed out.")
except:
raise PAError(PA_GET_SOURCES_ERROR, "Unable to get sources.")
def set_source_mute_by_index(self, index, mute):
try:
pa_context_set_source_mute_by_index(self.pa_ctx, index, mute,
self._pa_context_success_cb, None)
t = time.perf_counter()
while time.perf_counter() - t < 5:
if self.pa_status == PA_FINISHED:
return 1
raise PAError(PA_GET_SOURCES_TIMEOUT, "Unable to get sources, operation timed out.")
except:
raise PAError(PA_GET_SOURCES_ERROR, "Unable to get sources.")
def cvolume_to_linear(self, cvolume):
avg = 0
for chn in range(cvolume.channels):
avg = avg + cvolume.values[chn]
avg = avg / cvolume.channels
volume = pa_sw_volume_to_linear(uint32_t(int(avg)))
return volume
def cvolume_to_dB(self, cvolume):
avg = 0
for chn in range(cvolume.channels):
avg = avg + cvolume.values[chn]
avg = avg / cvolume.channels
volume = pa_sw_volume_to_dB(uint32_t(int(avg)))
return volume
def linear_to_cvolume(self, index, volume):
info = self.get_source_info_by_index(index)
cvolume = pa_cvolume()
v = pa_volume_t * 32
cvolume.channels = info[2].channels
cvolume.values = v()
for i in range(0, info[2].channels):
cvolume.values[i] = pa_sw_volume_from_linear(volume)
return cvolume
def dB_to_cvolume(self, channels, volume):
cvolume = pa_cvolume()
v = pa_volume_t * 32
cvolume.channels = channels
cvolume.values = v()
value = pa_sw_volume_from_dB(volume)
for i in range(0, channels):
cvolume.values[i] = value
return cvolume
将Kazam重启一次，我们看看Kazam的首选项
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