Dear Takashi, In previous mail you have mentioned > So, either the measurement is wrong, or the stream is already screwed > up at the time you call snd_pcm_period_elapsed(). what it means "measurement is wrong" and how to make that measurement is correct ? Regards, Chakravarthi On Tue, Aug 7, 2018 at 5:33 PM Takashi Iwai <tiwai@xxxxxxx> wrote: > > On Tue, 07 Aug 2018 13:59:46 +0200, > Chakravarthi Pradeep wrote: > > > > Dear Takashi, > > > > Trigger stop is getting called , because of this hwptr is zero and > > pointer call back is not getting called. Below is my log from driver. > > > > [ 838.491681] Trigger:Start > > [ 839.522233] hwptr=0 buf_pos:3456 > > [ 839.522244] buf_pos :3456 bytes_to_frames:864 uhdc_audio_pcm_pointer_253 > > [ 839.522249] Trigger:Stop > > Then you need to figure out the code path of the trigger stop. > > > In normal scenario, Trigger stop is not getting called and audio was > > able to render in the VLC application. Below log for normal scenario, > > [ 802.785893] Trigger:Start > > [ 814.288309] hwptr=0 buf_pos:6272 > > [ 814.288323] buf_pos :6272 bytes_to_frames:1568 uhdc_audio_pcm_pointer_253 > > [ 814.288362] buf_pos :6272 bytes_to_frames:1568 uhdc_audio_pcm_pointer_253 > > [ 814.288378] buf_pos :6272 bytes_to_frames:1568 uhdc_audio_pcm_pointer_253 > > [ 814.305079] hwptr=6272 buf_pos:9472 > > [ 814.305091] buf_pos :9472 bytes_to_frames:2368 uhdc_audio_pcm_pointer_253 > > [ 814.321741] hwptr=9472 buf_pos:12672 > > [ 814.321748] buf_pos :12672 bytes_to_frames:3168 uhdc_audio_pcm_pointer_253 > > [ 814.321777] buf_pos :12672 bytes_to_frames:3168 uhdc_audio_pcm_pointer_253 > > [ 814.321785] buf_pos :12672 bytes_to_frames:3168 uhdc_audio_pcm_pointer_253 > > [ 814.338452] hwptr=12672 buf_pos:15872 > > [ 814.338459] buf_pos :15872 bytes_to_frames:3968 uhdc_audio_pcm_pointer_253 > > [ 814.355242] hwptr=15872 buf_pos:19072 > > [ 814.355248] buf_pos :19072 bytes_to_frames:4768 uhdc_audio_pcm_pointer_253 > > [ 814.355288] buf_pos :19072 bytes_to_frames:4768 uhdc_audio_pcm_pointer_253 > > [ 814.355294] buf_pos :19072 bytes_to_frames:4768 uhdc_audio_pcm_pointer_253 > > [ 814.371822] hwptr=19072 buf_pos:22272 > > ... > > ... > > [ 830.739031] Trigger:Stop > > > > > > I can not do rmmod for ALSA driver. If I do sudo rmmod mydriver then it says > > "rmmod: ERROR: Module mydriver is in use" > > > > How can I remove mydriver module from linux kernel ? > > Likely some program is using the sound device. For example, a mixer > applet or PulseAudio keeps opening the control device. > Check it via "fuser -v /dev/snd/*" > > > Takashi -- Thanks and Regards Chakravarthi Pradeep.K Ph: 91 9980434900 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
