【发布时间】：2015-04-23 14:58:23
【问题描述】：
我在Ubuntu 14.04上安装了portaudio，并编译了一个测试程序如下：
gcc -o Test3c Test3c.c ../libportaudio.a -lrt -lasound -ljack -lpthread -lm
没有错误。 （Test3c.c和包含的pa_devs.c一样，可以在here找到。）但是当我运行它时，
./Test3c
我明白了：
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
PortAudio version number = 1899
PortAudio version text = 'PortAudio V19-devel (built Feb 14 2015 11:51:22)'
Number of devices = 20
--------------------------------------- device #0
Name = HDA Intel PCH: ALC892 Analog (hw:0,0)
Host API = ALSA
Max inputs = 2, Max outputs = 6
Default low input latency = 0.0058
Default low output latency = 0.0087
Default high input latency = 0.0348
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 2 channel input =
44100.00, 48000.00, 96000.00, 192000.00
Supported standard sample rates
for half-duplex 16 bit 6 channel output =
None
Supported standard sample rates
for full-duplex 16 bit 2 channel input, 6 channel output =
None
--------------------------------------- device #1
Name = HDA Intel PCH: ALC892 Digital (hw:0,1)
Host API = ALSA
Max inputs = 0, Max outputs = 2
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 2 channel output =
32000.00, 44100.00, 48000.00, 88200.00,
96000.00, 192000.00
--------------------------------------- device #2
Name = HDA Intel PCH: ALC892 Alt Analog (hw:0,2)
Host API = ALSA
Max inputs = 2, Max outputs = 0
Default low input latency = 0.0058
Default low output latency = -1.0000
Default high input latency = 0.0348
Default high output latency = -1.0000
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 2 channel input =
44100.00, 48000.00, 96000.00, 192000.00
--------------------------------------- device #3
Name = HDA NVidia: HDMI 0 (hw:1,3)
Host API = ALSA
Max inputs = 0, Max outputs = 8
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 8 channel output =
32000.00, 44100.00, 48000.00, 88200.00,
96000.00, 192000.00
--------------------------------------- device #4
Name = HDA NVidia: HDMI 0 (hw:1,7)
Host API = ALSA
Max inputs = 0, Max outputs = 8
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 8 channel output =
32000.00, 44100.00, 48000.00, 88200.00,
96000.00, 192000.00
--------------------------------------- device #5
Name = HDA NVidia: HDMI 0 (hw:1,8)
Host API = ALSA
Max inputs = 0, Max outputs = 8
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 8 channel output =
32000.00, 44100.00, 48000.00, 88200.00,
96000.00, 192000.00
--------------------------------------- device #6
Name = HDA NVidia: HDMI 0 (hw:1,9)
Host API = ALSA
Max inputs = 0, Max outputs = 8
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 8 channel output =
32000.00, 44100.00, 48000.00, 88200.00,
96000.00, 192000.00
--------------------------------------- device #7
Name = sysdefault
Host API = ALSA
Max inputs = 128, Max outputs = 128
Default low input latency = 0.0213
Default low output latency = 0.0213
Default high input latency = 0.0213
Default high output latency = 0.0213
Default sample rate = 48000.00
Supported standard sample rates
for half-duplex 16 bit 128 channel input =
8000.00, 9600.00, 11025.00, 16000.00,
22050.00, 32000.00, 44100.00, 48000.00,
88200.00
Supported standard sample rates
for half-duplex 16 bit 128 channel output =
8000.00, 9600.00, 11025.00, 16000.00,
22050.00, 32000.00, 44100.00, 48000.00,
88200.00
Supported standard sample rates
for full-duplex 16 bit 128 channel input, 128 channel output =
8000.00, 9600.00, 11025.00, 16000.00,
22050.00, 32000.00, 44100.00, 48000.00,
88200.00
--------------------------------------- device #8
Name = front
Host API = ALSA
Max inputs = 0, Max outputs = 6
Default low input latency = -1.0000
Default low output latency = 0.0058
Default high input latency = -1.0000
Default high output latency = 0.0348
Default sample rate = 44100.00
Supported standard sample rates
for half-duplex 16 bit 6 channel output =
Test3c: pcm_params.c:2249: snd1_pcm_hw_params_slave: Assertion `err >= 0' failed.
Aborted (core dumped)
当 Pa_IsFormatSupported() 被调用时，它在列出设备的中途崩溃。 Google 告诉我“pcm_params.c”指的是 ALSA 库。有没有人找到解决此类问题的方法？
【问题讨论】：
-
尝试更新
alsa-lib。 -
libasound2 和 libasound2-dev 已经是最新版本（1.0.27.2-3ubuntu7）。
-
更新：我重新安装了 Ubuntu Studio 14.04，现在它似乎可以工作了。
-
更新：现在它不再工作了，同样的错误。我相信问题是在我重做“./configure && make”后开始的。
标签： c ubuntu audio alsa portaudio