ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem

错误

在初始化espeak时，控制台里报如下错误：

ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem (MIXER,'AC97 2ch->4ch Copy Switch',0,0,0): No such file or directory
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem (MIXER,'AC97 2ch->4ch Copy Switch',0,0,0): No such file or directory
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem (PCM,'IEC958 Playback PCM Stream',0,0,0): No such file or directory
ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem (PCM,'IEC958 Playback PCM Stream',0,0,0): No such file or directory
ALSA lib setup.c:555:(add_elem) Cannot obtain info for CTL elem (PCM,'IEC958 Playback PCM Stream',0,0,0): No such file or directory
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
              

因为初次用espeak，对问题比较谨慎，就开始查找分析。

查找分析

网上说，卸载重装portaudio能解决。Make uninstall，make install没反应。错误提示依然有。

用下面指令看portaudio的状态：

[root@mod-sca1 reader]# ldd  /usr/local/lib/libportaudio.so.2

                linux-vdso.so.1 =>   (0x00007fff55ffd000)

                librt.so.1 => /lib64/librt.so.1 (0x00002aab0688a000)

                libasound.so.2 => /lib64/libasound.so.2 (0x00002aab06a94000)

                libm.so.6 => /lib64/libm.so.6 (0x00002aab06d6f000)

                libpthread.so.0 => /lib64/libpthread.so.0 (0x00002aab06ff2000)

                libc.so.6 => /lib64/libc.so.6 (0x00002aab0720e000)

                /lib64/ld-linux-x86-64.so.2 (0x00002aab0642c000)

                libdl.so.2 => /lib64/libdl.so.2 (0x00002aab07566000)

观察portaudio没问题啊。

You'll probably need to add -lm to link to the math library which has 'floor'. Also, put the libraries at the end of the command - for some reason, gcc cares about the order!

害怕没数学库，加了-lm不行，问题还有。
Libalsa-dev

安装alsa试下，安装不上。 没configure。

后来查的资料里隐约说不影响，就不管提示，运行软件，功能正常。

 

总结

开源项目会有提示，有提示不代表错误。