AMR NB related query

[Ashok Bhat]

Hi,
I have following questions on AMR-NB

(a) Is ARM optimization disabled?
AMR Narrow band codec, present in frameworks/av/media/libstagefright/codecs/amrnb, contains some in-line ARM assembly.
For example, common/include/basic_op_arm_gcc_v5.h contains GCC ARM in-line assembly for operations like mul, mac etc.
However these assembly optimizations don't seem to be enabled as PV_ARM_GCC_V5 is not defined anywhere in the project.

(b) Are the unused header files needed?
There are few header files in common/include like l_add.h which are not used anywhere. Are these files needed for something?

(c) Who uses AMR-NB on a standard device?
I believe it is used in voice record and playback applications. Is there some other applications that use AMR-NB on a stock device?

Regards
Ashok

[Glenn Kasten]

a. Try doing a git log and git blame to see why.

b. This might be an upstream project which was imported as-is.

If you think removing the files is an improvement, please suggest via a CL.

c. official Android doc:

http://developer.android.com/guide/appendix/media-formats.html

unofficial doc, I can't vouch for it:

http://everydaylife.globalpost.com/can-android-phones-play-amr-files-33950.html