Hi Takashi > > I wonder can I stop sound from driver side (not from user-land) > > as system error during playback or capture ? > > How to do it if we can ? > > Stop PCM substreams with SNDRV_PCM_STATE_XRUN. In detail, see > implementation of snd_pcm_stop_xrun() available in 3.19 or > later. Then, userspace applications cannot continue to read/write PCM > frames via ALSA uapi. > > When using alsa-lib, then, userspace applications receive -EPIPE as > return value of calling PCM APIs. The applications can stop their > operation for PCM character devices, or can also recover the XRUN > state of PCM substream by calling snd_pcm_prepare(). In this case, > struct snd_pcm_ops.prepare() is called again in driver side. > > I think tinyalsa works almost the same. Thank you for detail explanation ! I will try/investigate it Best regards --- Kuninori Morimoto _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
