alsa声卡问题
1、我的程序snd_pcm_open(&pcm, "default", SND_PCM_STREAM_CAPTURE, 0);返回错误，报以下错。
ALSA lib pcm_hw.c:1788:(_snd_pcm_hw_open) Unknown field slave
这是怎么回事？
2、还有我用的alsa的库文件，放在系统源文件的什么位置？
同问，是否解决了？ root@ubuntu:~/workspace/allwinner/A40i/bsp/lichee/buildroot-201611/target/user_rootfs_misc/OKA40i_C/sdk_lib/cedarx/include/external/include/alsa# ls
alisp.h asoundlib.h conf.h global.hlocal.h output.h pcm_ioplug.hrawmidi.h seqmid.h timer.h version.h
alsa-symbols.hasoundlib-head.hcontrol_external.hhwdep.h Makefile.am pcm_external.hpcm_old.h search.h seq_midi_event.htopology.h
aserver.h asoundlib-tail.hcontrol.h input.h mixer_abst.hpcm_extplug.h pcm_plugin.hseq_event.hsound type_compat.h
asoundef.h bswap.h error.h list.h mixer.h pcm.h pcm_rate.h seq.h sys.h use-case.h
root@ubuntu:~/workspace/allwinner/A40i/bsp/lichee/out/sun8iw11p1/linux/common/buildroot/build# ls
alsa-lib-1.1.2 bash-4.3.30 expat-2.2.0 host-gettext-0.19.8.1host-m4-1.4.17 host-util-linux-2.28.2libsndfile-1.0.27 readline-6.3 zlib-1.2.8
alsa-utils-1.1.2buildroot-confighost-autoconf-2.69host-libffi-3.2.1 host-ncurses-5.9 host-zlib-1.2.8 ncurses-5.9 skeleton
attr-2.4.47 build-time.log host-automake-1.15host-libglib2-2.50.1 host-pcre-8.39 libffi-3.2.1 packages-file-list.txttoolchain
audiofile-0.3.6 busybox-1.25.1 host-bison-3.0.4 host-libtool-2.4.6 host-pkgconf-0.9.12libglib2-2.50.1 pcre-8.39 toolchain-external
aumix-2.9.1 dbus-1.10.12 host-expat-2.2.0 host-libxml2-2.9.4 host-python-2.7.13 libsamplerate-0.1.8 python-2.7.13 util-linux-2.28.2
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