On 03.01.2017 18:17, Tanu Kaskinen wrote: > On Thu, 2016-12-15 at 12:34 +0530, Renjith Thomas wrote: >> Issue: When HFP/HSP profile is used with certain BT chipsets, the >> audio sounds heavily distorted, with very slow playback full of noise. >> During recording, the samples are dropped and it distorts the recorded >> audio samples. >> >> The root cause of both the issues are related to the fixed MTU sizes >> in the PA stack, which is 48 bytes. Here, the BT chipset CC256x had >> 180 bytes MTU and it was being under-utilized and the rate at which >> the samples were being accepted where not matching the expected rate, >> and hence the distortion. >> >> Solution: The appropriate solution to this problem is by reading the >> MTU size of the SCO socket using getsockopts dynamically. >> >> BugLink: http://bit.ly/2gDpGPv >> BugLink: http://bit.ly/2hQsARK >> --- >> src/modules/bluetooth/backend-native.c | 28 ++++++++++++++++++---------- >> 1 file changed, 18 insertions(+), 10 deletions(-) > Thanks! Applied to the "next" branch. > Hi, this patch breaks HSP for me. My headset (Plantonics Backbeat Pro) returns an MTU of 64, but it looks like this is only working for recording. When I try to play back something, I cannot hear any sound and the headset disconnects after a few seconds. When I set omtu to 48, everything is working again. Regards Georg
