ALSA：循环声音问题
我编写了一个小程序，用于在嵌入式 Linux 板上测试 ALSA 库。该程序配置 ALSA，播放单个声音，然后等待 1 分钟再退出。
这是我观察到的情况：播放声音后，有一段无声停顿，然后再次播放声音。我 100% 肯定该程序本身不会再次播放。
为了进一步研究，我做了另一个实验：在同一个板上播放时，我播放了不同的声音。这很好用。接下来我再次执行我的 hello world 程序。这次除了周期性的声音之外，我还听到了aplay播放的其他声音的残余。
我怀疑 alsa-lib 或声音驱动程序中的缓冲区没有被清除。或者我可能没有正确配置软件参数。 snd_pcm_dump 吐出以下信息：
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 32768
period_size : 2048
period_time : 256000
tstamp_mode : NONE
period_step : 1
avail_min : 2048
period_event : 0
start_threshold : 1
stop_threshold : 32768
silence_threshold: 0
silence_size : 0
boundary : 1073741824
我还应该提到的是，我在 Ubuntu 下运行它时没有看到任何这些信息。
I have written a small program that tests the ALSA library on an Embedded Linux board. The program configures ALSA, plays a single sound and then waits 1 minute before exiting.
Here is what I am observing: after playing the sound, there is silent pause and then the sound is played again. I am 100% positive that the program itself is not playing it again.
To further investigate, I did another experiment: With aplay on the same board, I played a different sound. This worked fine. Next I executed my hello world program again. This time in addition to the periodic sound, I heard remnants other the sound played by aplay.
I suspect that a buffer either in alsa-lib or the sound driver is not getting cleared. Or that I might have not configured a software parameter correctly. snd_pcm_dump spits out the following information:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 8000
exact rate : 8000 (8000/1)
msbits : 16
buffer_size : 32768
period_size : 2048
period_time : 256000
tstamp_mode : NONE
period_step : 1
avail_min : 2048
period_event : 0
start_threshold : 1
stop_threshold : 32768
silence_threshold: 0
silence_size : 0
boundary : 1073741824
I should also mention that I do not see any of this is I run it under Ubuntu.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
我在不使用 alsa-lib 的情况下遇到了一些类似的问题。但有了 alsa i 和 ubuntu ts self。我发现煞费苦心地检查驱动程序并测试它们是最好的选择，同时使用诸如speaker-test -c2 -twav之类的东西也有很大的帮助
至于你的萨尔萨舞实施，我看不出有什么可看的。但恐怕如果没有更多信息，我无法提供更多帮助。
I had some similar issues not using alsa-lib. But with alsa i and ubuntu ts self. I found painstakingly going through the drivers and testing them to be the best option also using something like speaker-test -c2 -twav to be a big help
As for your salsa implementation I don't see anything to look at. But I am afraid without more info I can't be of more assistance.