At Sun, 19 Nov 2006 17:29:14 -0500, Lee Revell wrote: > > I have an ALSA driver that uses a copy() callback for playback, which in > turn schedules a workqueue to deliver the audio to the hardware. In > certain conditions, writing the data to the hardware can fail. From the > workqueue handler, how can I indicate to the ALSA middle layer that a > fatal error has occurred and playback must be terminated with -EIO? You can stop the PCM stream from the work handler by calling snd_pcm_stop(). Usually passing SNDRV_PCM_STATE_XRUN in the second argument would be fine, especially if a following prepare call can repair the PCM. The copy callback can return an error, too. In this case, the callback itself should stop the stream explicitly. Also, the pointer callback can return a special value SNDRV_PCM_POS_XRUN to indicate the XRUN. In this case, the PCM core automatically stops the stream unlike the error case of copy callback. Takashi ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
