Menu
▾
▴
[gphoto-cvs] SF.net SVN: gphoto:[13052] branches/libgphoto2-2_4/libgphoto2/camlibs/ax203
|
From: <jwr...@us...> - 2010-05-03 08:36:16
|
Revision: 13052
http://gphoto.svn.sourceforge.net/gphoto/?rev=13052&view=rev
Author: jwrdegoede
Date: 2010-05-03 08:36:10 +0000 (Mon, 03 May 2010)
Log Message:
-----------
ax203: Update READMEs with ax3003 info
Modified Paths:
--------------
branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203
branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203-compression
Modified: branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203
===================================================================
--- branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203 2010-05-03 08:20:52 UTC (rev 13051)
+++ branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203 2010-05-03 08:36:10 UTC (rev 13052)
@@ -3,10 +3,11 @@
This driver allows you to upload / download and delete pictures from
appotech ax203 and ax206 based picture frames. This are small, cheap
-picture frames with a 1.1, 1.5, 1.8 or 2.4 inch display and a USB id of:
+picture frames with a 1.1, 1.5, 1.8, 2.4 or 3.5 inch display and an USB id of:
1908:0102
1908:1315
1908:1320
+1908:3335
ax203 based frames present themselves as a usb mass storage cdrom, which
contains the windows software. Communication with the device happens by
@@ -57,7 +58,7 @@
About the ax203 image compression
==================================
-The ax203 family of picframe controllers actually comes with 3 different
+The ax203 family of picframe controllers actually comes with 4 different
flavors of compression, see README.ax203-compression.
@@ -71,6 +72,47 @@
byte 0xffe: 0x55 this byte and the next one are a magic marker to
byte 0xfff: 0xaa indicate the parameter block is valid
+ax3003 based frames contain 2 blocks with images, 1 with the images to be shown
+and one with images used inside the menus. The memory map for my ax3003 frame
+looks like this:
+ 407cc Menu images file table, 2 bytes per file 16 bit big endian
+ start address / 256.
+ 70000 bootsplash
+ 79000 No pictures picture
+ 7f400 Pinguin picture, use unknown
+ 86900 Sync with PC picture
+ 8d200 ?? Not JPEG data
+ 99200 Clock hands
+ a4600 Font + strings + clock hands for calendar display (English)
+ b0400 Font for digital clock
+ b7000 Font + strings + clock hands for calendar display (German)
+ c5000 Font + strings + clock hands for calendar display (French)
+ d2f00 Setup screen (English)
+ db300 Setup screen scrolled (English)
+ e3500 Setup screen (French)
+ eda00 Setup screen scrolled (French)
+ f5f00 Setup screen (German)
+ ff200 Setup screen scrolled (German)
+107a00 Setup screen bars
+10cb00 Calendar screen (English)
+114100 Clock screen
+11b800 Calendar screen (French)
+124900 Calendar screen (German)
+12d500 Wav file
+12e400 Wav file
+12ed00 Wav file
+136f00 Wav file
+14e700 ISO start
+180000 ABFS
+181000 Picture start
+1f0000 Picture end, boot loader ?
+1f8020 Something
+1f9000 Unused
+As you can see the jpeg data for the menu screens is rather large this is
+because it contains a ton of JPEG metadata from photoshop, if this were
+to be removed, a lot more of the memory could be used to actually store
+pictures.
+
Hans de Goede <hde...@re...>
-7 April 2010
+3 May 2010
Modified: branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203-compression
===================================================================
--- branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203-compression 2010-05-03 08:20:52 UTC (rev 13051)
+++ branches/libgphoto2-2_4/libgphoto2/camlibs/ax203/README.ax203-compression 2010-05-03 08:36:10 UTC (rev 13052)
@@ -1,7 +1,7 @@
History of the reverse engineering of the ax203 compression
-----------------------------------------------------------
-There are 3 (known) different compression algorithms:
+There are 4 (known) different compression algorithms:
YUV This algorithm uses a simple YUV format, with the UV members
subsampled at a 2x2 resolution. It uses 5 bits for the Y
@@ -16,9 +16,11 @@
pixels + 4 U and 4 V pixels. This is used with firmware v3.3.x
(usb-id 1908:1315) and v3.4.x frames (usb-id 1908:1320)
-JPEG Uses a JPEG derived format reverse engineering this one
+JPEG (ax3003) Regular JPEG
+
+JPEG (ax206) Uses a JPEG derived format reverse engineering this one
was a challenge, see below for the full story. This is used with
- v3.5.x frames (usb-id 1908:0102)
+ ax206 based firmware v3.5.x frames (usb-id 1908:0102)
After some failed attempts by me (Hans de Goede), I asked help
from Bertrik Sikken with reverse engineering the JPEG compression.
This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.
|