- alsa-lib. ALSA 应用库(最常用)
- alsa-driver 一些常见芯片的ALSA驱动代码,一般内核会集成.
- alsa-firmware 一些DSP或ASIC的专用的微码(运在芯片之上,启动时由LINUX装入到硬件中).
- alsa-utils 一般ALSA小的测试工具.如aplay/arecord 播放和录音小程序.
- alsa-oss 用alsa接口模拟旧的oss接口.
[root@hxy alsa-lib-1.0.22]# cat /proc/asound/devices 2: : timer 3: : sequencer 4: [ 0- 0]: raw midi 5: [ 0- 1]: digital audio playback 6: [ 0- 0]: digital audio playback 7: [ 0- 0]: digital audio capture 8: [ 0] : control |
[root@hxy alsa-lib-1.0.22]# ls -l /dev/snd total 0 crw------- 1 root root 116, 8 Mar 2 02:41 controlC0 crw------- 1 root root 116, 4 Mar 2 02:41 midiC0D0 crw------- 1 root root 116, 7 Mar 2 02:41 pcmC0D0c crw------- 1 root root 116, 6 Mar 2 02:41 pcmC0D0p crw------- 1 root root 116, 5 Mar 2 02:41 pcmC0D1p crw------- 1 root root 116, 3 Mar 2 02:41 seq crw------- 1 root root 116, 2 Mar 2 02:41 timer |
- 播放wave文件
- aplay /mnt/nfs/test.wav
- 变频播放,(以是以 44 KHz来播放音频)
- aplay -D rate_44k /mnt/nfs/test.wav
- 录音,以20秒的间隔(-d 20),立体声(-c 2),频率是 8000Hz来录制Wave格式音频
- arecord -d 20 -c 2 -t wav -r 8000 -f "Signed 16 bit Little Endian" /mnt/nfs/test.wav
- 测试混音播放(先是播放test1.wav,然后再同时播放test2.wav)
- aplay -D plug:dmix_44k /mnt/nfs/test1.wav &
- aplay -D plug:dmix_44k /mnt/nfs/test2.wav
- 设置放音增益(0 to 3)
- amixer set Master 1
- 设置录音音量(0-31)
- amixer set Line 10
./configure --host=arm-linux --prefix=$PWD/../../output/arm-linux --enable-static --enable-shared --disable-python --with-configdir=/usr/local/share --with-plugindir=/usr/local/lib/alsa_lib |
ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM default aplay: main:546: audio open error: No such file or directory |
./configure --host=arm-linux --prefix=$PWD/../../output/arm-linux --enable-static --enable-shared --disable-python --with-configdir=/usr/local/share/alsa --datarootdir=$PWD/../../output/arm-linux/share |
./configure --host=arm-linux --prefix=$PWD/../../output/arm-linux --enable-static --enable-shared --with-configdir=/usr/local/share --with-libiconv-prefix=$PWD/../../output/arm-linux CFLAGS="-I$PWD/../../output/arm-linux/include" LDFLAGS="-L$PWD/../../output/arm-linux/lib -lasound -liconv" --disable-alsamixer --disable-xmlto |