1045489 - Playing music is choopy when the A2DP is connected.

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: AudioChannel, defect)

Description

[Star Cheng [:scheng]]

STR:

1.Connect to A2DP device
2.Launch music app and select a file to playback

Comment 1

[Star Cheng [:scheng]]

FxOS use openSL ndk lib to communitcate with Android audio back-end (AudioTrack/AudioFlinger..). And the framecount is decided by paramenters of Audio HAL. In duplicated mixer mode (codec + A2DP), the framecount value is so huge that takes more time to fill the buffer. We restrict the framecount value in order to decrease the filled buffer time.

We can restrict the minBufCount value[1], in order to get reasonable shared memory buffer.


[1]http://androidxref.com/4.3_r2.1/xref/frameworks/av/services/audioflinger/Threads.cpp#1164

Comment 2

[Shawn Huang [:shawnjohnjr][:shuang] (as a happy gecko contributor)]

Not sure if this is related to bug 1038134. In bug 1038134, We found bluedroid btif_media_task got underflow problem, and gecko actually write data to Audioflinger. Thus, we suspect there is huge delay bewteen audio_a2dp_hw (producer) to btif_media_task (consumer). We reduce buffer size, and it improve a lot. 
Then I found this patch because there are some discussion in cyanogenmod community.

Comment 3

[Shawn Huang [:shawnjohnjr][:shuang] (as a happy gecko contributor)]

But i'm not sure this bug is duplicated of bug 1045489.

Comment 4

[BMO Automation]

Firefox OS is not being worked on