Process/File View of Android camera subsystem

This article is based Android 4.2.2 from the process / The document's perspective Android Camera subsystem.

Androidcamera The overall architecture of the subsystem is divided into two parts of the client and server, which are built on the basis of the Android inter-process communication mechanism binder.

View process

[Email protected]:/# PS

USER PID PPID vsize RSS  Wchan PC    NAME

Media 1012 1 37484 8740 FFFFFFFF 4016bfe8 S/system/bin/mediaserver

u0_a142119 1010 162156 31244 ffffffff 4007cee4 S Com.android.camera

View Threads

[Email protected]:/# ps-t

Userpid PPID vsize RSS Wchan PC NAME

media1012 1 37484 8740 ffffffff 4016bfe8 s/system/bin/mediaserver

media1191 1012 37484 8740 c0042004 4016d108 S Audiocommand

media1192 1012 37484 8740 c0042004 4016d108 S Apmcommand

media1208 1012 37484 8740 c0042004 4016d108 S audioout_2

media1209 1012 37484 8740 C02B2FFC 4016bfe8 S binder_1

media1519 1012 37484 8740 C02B2FFC 4016bfe8 S binder_2

media2055 1012 37484 8740 C02B2FFC 4016bfe8 S binder_3

media2362 1012 37484 8740 c0042004 4016d108 S timedeventqueue

media2363 1012 37484 8740 c0042004 4016d108 S. Vorbis.decoder

media2364 1012 37484 8740 c0042004 4016d108 S omxcallbackdisp

media2365 1012 37484 8740 c0042004 4016d108 S timedeventqueue

media2366 1012 37484 8740 c0042004 4016d108 S. Vorbis.decoder

media2367 1012 37484 8740 c0042004 4016d108 S omxcallbackdisp

media2368 1012 37484 8740 00000000 4016d6a4 R camerapreviewth

media2369 1012 37484 8740 c0042004 4016d108 S cameraautofocus

u0_a142119 1010 162156 31244 ffffffff 4007cee4 S Com.android.camera

u0_a142122 2119 162156 31244 c0042004 4007d108 S GC

u0_a142124 2119 162156 31244 c0026658 4007c9c8 S Signal Catcher

u0_a142125 2119 162156 31244 c0364f54 4007cbd0 S JDWP

u0_a142126 2119 162156 31244 c0042004 4007d108 S Compiler

u0_a142127 2119 162156 31244 c0042004 4007d108 S referencequeued

u0_a142128 2119 162156 31244 c0042004 4007d108 S Finalizerdaemon

u0_a142129 2119 162156 31244 c0042004 4007d108 S finalizerwatchd

u0_a142130 2119 162156 31244 c02b2ffc 4007bfe8 S binder_1

u0_a142131 2119 162156 31244 c02b2ffc 4007bfe8 S binder_2

u0_a142134 2119 162156 31244 c0042004 4007d108 S pool-1-thread-1

u0_a142136 2119 162156 31244 c00a5004 4007cee4 S cameraholder

u0_a142152 2119 162156 31244 c02b2ffc 4007bfe8 S binder_3

u0_a142375 2119 162156 31244 c0042004 4007d108 S soundpool

u0_a142376 2119 162156 31244 c0042004 4007d108 S soundpoolthread

u0_a142377 2119 162156 31244 c0042004 4007d108 S Thread-123

List Binder Service

[Email protected]:/# Service List

63media.audio_policy: [Android.media.IAudioPolicyService]

64media.camera: [Android.hardware.ICameraService]

65media.player: [Android.media.IMediaPlayerService]

66media.audio_flinger: [Android.media.IAudioFlinger]

View process virtual address space

Media 1012 1 37484 8740 ffffffff 4016bfe8 S/system/bin/mediaserver

[Email protected]:/# cat/proc/1012/maps

401f7000-40215000r-xp 00000000 00:11 637/system/lib/libbinder.so

40215000-4021a000r--p 0001d000 00:11 637/system/lib/libbinder.so

4021a000-4021b000rw-p 00022000 00:11 637/system/lib/libbinder.so

4025a000-4025b000r-xp 00000000 00:11 524/system/lib/libhardware.so

4025b000-4025c000r--p 00000000 00:11 524/system/lib/libhardware.so

4025c000-4025d000rw-p 00001000 00:11 524/system/lib/libhardware.so

40451000-40467000r-xp 00000000 00:11 585/system/lib/libcamera_client.so

40467000-40468000---P 00000000 00:00 0

40468000-4046d000r--p 00016000 00:11 585/system/lib/libcamera_client.so

4046d000-4046e000rw-p 0001b000 00:11 585/system/lib/libcamera_client.so

40581000-40586000r-xp 00000000 00:11 636/system/lib/libhardware_legacy.so

40586000-40587000r--p 00004000 00:11 636/system/lib/libhardware_legacy.so

40587000-40588000rw-p 00005000 00:11 636/system/lib/libhardware_legacy.so

4059c000-405d4000r-xp 00000000 00:11 655/system/lib/libcameraservice.so

405d4000-405d8000r--p 00037000 00:11 655/system/lib/libcameraservice.so

405d8000-405d9000rw-p 0003b000 00:11 655/system/lib/libcameraservice.so

405d9000-405dc000r-xp 00000000 00:11 582/system/lib/libcamera_metadata.so

405dc000-405dd000r--p 00002000 00:11 582/system/lib/libcamera_metadata.so

405dd000-405de000rw-p 00003000 00:11 582/system/lib/libcamera_metadata.so

40b12000-40b1f000r-xp 00000000 00:11 569/system/lib/hw/camera.sama5d3-ek.so

40b1f000-40b20000r--p 0000c000 00:11 569/system/lib/hw/camera.sama5d3-ek.so

40b20000-40b21000rw-p 0000d000 00:11 569/system/lib/hw/camera.sama5d3-ek.so

41eb5000-41eb7000r-xp 00000000 00:11 565/system/lib/hw/gralloc.sama5d3-ek.so

41eb7000-41eb8000r--p 00001000 00:11 565/system/lib/hw/gralloc.sama5d3-ek.so

41eb8000-41eb9000rw-p 00002000 00:11 565/system/lib/hw/gralloc.sama5d3-ek.so

42264000-42426000rw-s 3f200000 00:0b 554/dev/video1

u0_a142119 1010 162156 31244 ffffffff 4007cee4 S Com.android.camera

[Email protected]:/# cat/proc/2119/maps

40130000-4014e000r-xp 00000000 00:11 637/system/lib/libbinder.so

4014e000-40153000r--p 0001d000 00:11 637/system/lib/libbinder.so

40153000-40154000rw-p 00022000 00:11 637/system/lib/libbinder.so

40154000-401e5000r-xp 00000000 00:11 598/system/lib/libandroid_runtime.so

401e5000-401e6000---P 00000000 00:00 0

401e6000-401ea000r--p 00091000 00:11 598/system/lib/libandroid_runtime.so

401ea000-401f0000rw-p 00095000 00:11 598/system/lib/libandroid_runtime.so

404e9000-404ff000r-xp 00000000 00:11 585/system/lib/libcamera_client.so

404ff000-40500000---P 00000000 00:00 0

40500000-40505000r--p 00016000 00:11 585/system/lib/libcamera_client.so

40505000-40506000rw-p 0001b000 00:11 585/system/lib/libcamera_client.so

44cfe000-44cff000r--s 003c4000 00:11 160/system/framework/framework.jar

44cff000-456f2000r--p 00000000 00:12 107/data/dalvik-cache/[email protected]@[email protected]

456f2000-457b3000rw-p 00000000 00:04 1203/dev/ashmem/dalvik-aux-structure (Deleted)

4939a000-493a2000r--s 0010c000 00:11 195/system/app/legacycamera.apk

493a2000-493ef000r--s 000bc000 00:11 195/system/app/legacycamera.apk

493ef000-493f7000r--s 0010c000 00:11 195/system/app/legacycamera.apk

493f7000-49447000r--p 00000000 00:12 485/data/dalvik-cache/[email protected]@[email protected]

49447000-49450000rw-p 00000000 00:04 3819/dev/ashmem/dalvik-aux-structure (Deleted)