bluetooth - Why in Bluez 5.35 SBC codec capabilities are initialized in android/hal-audio-sbc.c packge not in AVDTP.c -


i updating bluez 4.97 5.35 in embedded device.

for a2dp connection, have share sbc codec capabilities. in ideal case capablity figure 1 avdtp packet bluez 4.97. in bluez 4.97 code, getting sbc codec capability sbc_getcap_ind() function in avdtp layer. in sbc_getcap_ind(), both sbc_codec_cap , avdtp_media_codec_capability initialized. capability packet can send phone.

in 5.35, sbc_getcap_ind() function not available. avdtp_media_codec_capability set in endpoint_getcap_ind() function in avdtp layer, per expectation. sbc_codec_cap not initialized. getting packect in figure2avdtp corrupt packet bluez 5.35.

in bluez 5.35 there comes new package android/hal-audio-sbc.c, in package sbc coded capability set.

my embedded device rtos based , have nothing android. so have following doubt:

1) why there new android package in bluez stack? what's development idea behind this?

2) why sbc capabilities initialized in android/hal-audio-sbc.c, how non-android device access sbc capabilities?

3) how in embedded environment, can use android/hal-audio-sbc.c sbc capabilities?

i think not able resolve issue because missing understanding of new 5.35 architecture. , there not enough documents understand bluez architecture. hope getting answer of these question can understand significance of android folder in 5.35 bluez package.

before answering questions, share couple of url's.

  1. porting guide
  2. management interface

coming questions,

  1. bluez supports both android , linux platform. directory "android" contains sources related android platform, can't used linux environment. idea behind share common code of development between linux , android, , develop common functionalities separately (mostly under "src", "gdbus" , "profile" directories).
  2. as part of bluez 4 bluez 5 migration or major development, audio related implementations moved out of bluez. it's responsibility of audio application implement whole stuff on it's own , register bluez (doc/profile-api.txt ==> registerprofile() method). bluez act mediator between application , devices. far linux concerned, there no audio implementation inside bluez. not sure android directory under bluez. non-android platforms needs implement on own.
  3. as mentioned, need implement our own audio related profiles bluez. have 1 working software, pulseaudio. can load module-bluez-discover in pulseaudio (pactl) , pulse audio takes care of audio.

there solution available in open source, bluealsa under active development. after using it, see lot of delay in audio , less quality. if want perfect solution, implement on own or use pulseaudio (no real time).

in simple words, migration application bluez 4.x bluez 5.x not easy!


Comments

Post a Comment

Popular posts from this blog

Command prompt result in label. Python 2.7 -

i want put result(output) of shell command label. command works, label shows "0", however, in command prompt, result shown correctly, need showed in label. doing ubuntu. myg1 = button(root, text="rodyti informacija", command=lambda: gauti()) myg1.pack(side=bottom) def gauti(): imti = tekstas.get("1.0", "end-1c") info = subprocess.call("id '{imti}' ".format(imti=imti), shell=true) w = label(root, text= info) w.pack(side = bottom) subprocess.call() returns exit code of process created (in case 0 success). if want text output of process, should instead call subprocess.check_output() .
Read more

javascript - How do I use URL parameters to change link href on page? -

i change href value of link using url parameters. example: default <a id="dlink" href="link-1">link</a> but, when user goes https://url.com/?dlink=link-2 it swaps out link new link <a id="dlink" href="link-2">link</a> first need value url. if you're not using javascript framework can create function using jquery. please check get url parameter jquery or how query string values in js it. after that, element "a" id , set value there. $("#dlink").attr("href", hreffromparam);
Read more

amazon web services - AWS Route53 Trying To Get Site To Resolve To www -

so have domain nameservers pointed aws route 53. site hosted on ec2 instance , reachable resolves site.com, if input www.site.com. i'm curious how site resolve www.site.com. have under route53 domains hosted zone 2 additional record sets outside of ns , soa: a site.com ec2 elastic ip cname www.site.com ec2 public dns i can reach site using both site.com , www.site.com, resolve site.com. there way make if enter either, resolves www.site.com? at first, both should record set. a site.com ec2 elastic ip www.site.com ec2 elastic ip and need redirect setting in web server (nginx, apache, ..) following. (source: how redirect www non-www nginx on centos 7 ) redirect non-www www if want redirect users plain, non-www domain www domain, add server block: server { server_name example.com; return 301 $scheme://www.example.com$request_uri; } save , exit. configures nginx redirect requests "example.com" "www.example.com". not
Read more