Sunday, September 12, 2010

Stagefright player and its class diagram...

An overview of Stagefright player

There is a new playback engine implemented by Google comes with Android 2.0 (i.e, Stagefright), which seems to be quite simple and straightforward compared with the OpenCORE solution.
  • MediaExtractor is responsible for retrieving track data and the corresponding meta data from the underlying file system or http stream;
  • Leveraging OMX for decoding: there are two OMX plugins currently, adapting to PV's software codec and vendor's hardware implementation respectively. And there is a local implementation of software codecs which encapsulates PV's decoder APIs directly;
  • AudioPlayer is responsible for rendering audio, it also provides the timebase for timing and A/V synchronization whenever audio track is present;
  • Depending on which codec is picked, a local or remote render will be created for video rendering; and system clock is used as the timebase for video only playback;
  • AwesomePlayer works as the engine to coordinate the above modules, and is finally connected into android media framework through the adapter of StagefrightPlayer.

Wednesday, June 2, 2010

[Ubuntu] Error while logging-in.

“The configuration defaults for GNOME Power Manager have not been installed correctly. Please contact your computer administrator.”

After you enter the password on login screen, it takes you back to login screen making you unable to log in.

However, you can still get to terminal. Press Ctrl+Alt+F1 to drop to terminal from login screen. Enter your username and password and execute the following command:

sudo apt-get clean

This will clean up the package cache freeing up lots of disk space. If you don’t have anything in the cache you’ll have to move your files to another partition. You can use mvfor the purpose.

mv source destination

For eg;
mv ./ /media/disk-3/

This will move the file – to /media/disk-3.


Monday, April 5, 2010

Network Card Information.

For logging on to the net or for attaching as a node on a LAN, your computer needs a network card. The network card forms the interface between your computer and the network. There are different kinds of network cards available in the market depending on its speed and other features. Here is a tip to find out the characteristics of your network card.

If you want to find what type of network card is used, its speed, on which IRQ it is listed, and the chip type used, you use the following command :

# dmesg |grep eth0
Here eth0 is the first network card. If you have additional cards, it will be named eth1, eth2 and so on. And here is the output of the above command :
divert: allocating divert_blk for eth0
eth0: RealTek RTL8139 at 0xd800, 00:80:48:34:c2:84, IRQ 9
eth0: Identified 8139 chip type 'RTL-8100B/8139D'
divert: freeing divert_blk for eth0
divert: allocating divert_blk for eth0
eth0: RealTek RTL8139 at 0xd800, 00:90:44:34:a5:33, IRQ 9
eth0: Identified 8139 chip type 'RTL-8100B/8139D'
eth0: link up, 100Mbps, full-duplex, lpa 0x41E1
eth0: no IPv6 routers present
The important things to note here are those highlighted in colour. As you can see from the above listing, my ethernet card is a RealTek RTL8139 chipset based card on IRQ 9 (Interrupt Request). Its speed is100 Mbps and is a full-duplex card. And the link is up.

Wednesday, March 31, 2010

how to set variables in Linux ubuntu...???

Question: I wrote my own shell scripts and kept those in bin directory in my home directory. I set the PATH variable as PATH=$PATH:$HOME/bin so that i can run those scripts directly as usual commands whatever may be the present working directory. But it is working for that session only. If I close the shell prompt and reopen it, the previous PATH variable that i set is dissapearing from PATH. Now, the scripts which are in bin directory, can no more run as usual commands. I need to again set the PATH variable to that bin directory.
Is there any way to set environmental variable "PATH" permanantly so that it will not dissappear from PATH variable listing?

Answer: Assuming you are using bash as your shell, put this in your .bashrc file. Your .bashrc file should be located in /home/Yourusername/.bashrc or ~/.bashrc for short.

this is what you should put in that file:

export PATH=$PATH:/home/YourUserName/bin


If you want to set the path of a user you can edit your .bash_profile in home directory.

In my .bash_profile i have:

# set PATH so it includes user's private bin if it exists
if [ -d ~/bin ] ; then

If you don't have it copy and paste this code.

Thursday, February 4, 2010

Only for u jAAnAAA...

Aaj na jane kyu kuch kami si lag rahi hai,
Airport ki security ki koi tension nahi hai,
Na hi onsite jane ka koi excitement hai,
Aur to aur Airhostess ko dekhne ka koi craze nahi hai,
Kahi na kahi kuch na kuch to ho raha hai.....!!!

Samaaaa kuch badla badla sa lag raha hai,
Jiske baare me sirf hamesha suna tha..
woh sab mere saath hone laga hai,
raaton ki nind aur din ka chain sab khone laga tha,
Aur ab to me bhi din me sapano me khone laga tha...

Yuun to baarish ki boondon ne hamesha hi fantasize kiya tha,
lekin is pehli baarish ka alag hi ehsaas tha,
woh dhime se hawa ka gaalon ko chu jana,
Aur kissi ke saath hone ke ehsaas se hi..
hootho par halki si muskaan ka aajana...
Kabhi socha na tha ki kissi ke aane se,
Zindagi itni badal jayegi...

Ohhoooo abhi samajha yeh achanak badlaav ka raaz,
bichara dimaag kya kya sambhale,
Ab dil to humare paas hai nahi aur jo bacha hai,
usme bhi sirf tumhari hi yaadein hai..

Yaara yeh pyaar bhi badi kamini cheez hai...
Har pal har samay sirf unhi ka khayal rehta hai,
Ab to har chehre me sirf tum hi dikhai dete ho,
Aur sabhi ke woh nakhare bilkul tumhare lagate hai,
Dar lagata hai kayi baar kahi unhe tum na samajhkar...
kuch ulta sidha na kar doon..... :-)

Abhi kissi ke saath hone ke ehsaas jude hi the ki,
kismat ko kuch aur hi manzoor tha,
na jaane kiski nazar lagi thi hume ki,
milte hi fir juda hona tay ho gaya tha..

milna bichadna to upar wale ke haath me hai..
ya kameeno dostoon ka jealouspana hai,
ya yu kahu ki yeh sab dil ko behlane ke tareeke hai,
hume to sirf yeh jatana tha ki aapse door hokar
hum aapko kitna miss karte hai..
koi agar boondo se naape to sara samundar bhi kam pad jaye,,,,, :-)

Monday, June 1, 2009

Sunday, April 5, 2009

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