Steve Chen wrote: > I believe GStreamer uses the OSS emulation layer. It appears that the > problem is at sample rate of 44.1k. >
I disabled CONFIG_SND_SUPPORT_OLD_API and tried with that. Results are the same. Is there a way to disable OSS emulation layer, or should I check gstreamer handling of alsa? >> >From these two examples it was clear(at least for me) that there were some >> problem with driver, especially at 44100 khz either 1 channel or 2 channel. >> Later I converted davincieffect.mp2 to wav at two different sample rates and >> played with aplay as such: >> >> $aplay r441_c2.wav > > Can you try > > aplay -D hw:0,1 r441_c2.wav > > If you see something like > > Warning: rate is not accurate (requested = 44100Hz, got = 48000Hz) > please, try the plug plugin > > That means McBSP/AIC33 are not setup to handle sample rate of 44.1K > directly. The sample rates are covered by software. The problem is > likely in the area of rate conversion. > > If you don't see the warning, McBSP/AIC33 is setup to handle 44.1K > directly. You man want to check with clock settings (make sure AIC33 is > setup as the master). > I tried and there was no warning: $aplay -v -D hw:0,0 r441_c2.wav Playing WAVE 'r441_c2.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo Hardware PCM card 0 'DaVinci Beginning' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 22400 period_size : 896 period_time : 20317 tstamp_mode : NONE period_step : 1 avail_min : 896 period_event : 0 start_threshold : 22400 stop_threshold : 22400 silence_threshold: 0 silence_size : 0 boundary : 1468006400 appl_ptr : 0 hw_ptr : 0 I started seeing this issue after applying this patch, maybe there is something wrong with ping-pong buffer handling as this problem is present only when sample rate is 44.1 khz. Regards, Caglar _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
