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Unified Diff: README

Issue 2364793002: Revert "Uprev libmtp to 1.1.12" (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/libmtp@master
Patch Set: Created 4 years, 3 months ago
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Index: README
diff --git a/README b/README
index 6fe143e759c619798c4ada616112457ffe1cadb1..f67e3611619b4aa4c356417895af4ebd816381b6 100644
--- a/README
+++ b/README
@@ -14,15 +14,10 @@ controller interface, using libusb to access the host
controller.
If you're more interested in the MTP responders, gadgets like
-MP3 players, mobile phones etc, look into:
-- MeeGo:s Buteo Sync:
- https://github.com/nemomobile/buteo-mtp
- https://wiki.merproject.org/wiki/Buteo/MTP
-- Android has an MTP responder implementation:
- https://android.googlesource.com/platform/frameworks/base/+/master/media/jni/
-- Ubuntu/Ricardo Salveti has mtp-server and libmtp-server going:
- https://code.launchpad.net/~phablet-team/mtp/trunk
- http://bazaar.launchpad.net/~phablet-team/mtp/trunk/files
+MP3 players, mobile phones etc, look into MeeGo:s Buteo Sync:
+http://wiki.meego.com/Buteo - these guys are creating a fully
+open source MTP responder.
+
Heritage
--------
@@ -143,25 +138,6 @@ Some MTP devices have strange pecularities. We try to work around
these whenever we can, sometimes we cannot work around it or we
cannot test your solution.
-* Android locked screen: some devices just report zero files
- and no storages when the device screen is locked, it looks like
- so:
-
- mtp-detect
- Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
- Attempting to connect device(s)
- Error 1: Get Storage information failed.
- Device: SHV-E210K
- LIBMTP_Get_Storage(): No data available
- OK.
-
- This is probably so as not to allow the MTP access to be used
- as a "backdoor" into the device. Unlock the device before listing
- files, set the autolock to some large value or disabled if it
- disturbs you, you are causing this to yourself, or should we say
- that your vendor is prioritizing security and privacy over
- ease-of-use. (You may talk to your vendor about this.)
-
* mtp-* tools doesn't work because someone else is already hogging
the device
@@ -174,12 +150,10 @@ cannot test your solution.
Then re-attach the device.
- Sometimes some gvfs daemons are running on the
- system and hogging the device, try stopping them
- with something like these commands:
+ Sometimes the "gvfs-gphoto2-volume-monitor" is running on the
+ system and hogging the device, try something like:
- killall gvfs-mtp-volume-monitor
- killall gvfs-gphoto2-volume-monitor
+ pkill gfvs-gphoto2-volume-monitor
Then plug in the device and issue "mtp-detect" to figure out if
this may be the case.
@@ -231,6 +205,13 @@ cannot test your solution.
manufacturer and ask them to test their product with some libmtp
program.
+* Android locked screen: some devices just report zero files
+ and no storages when the device is locked, probably so as not
+ to allow the MTP access to be used as a "backdoor" into the
+ device. Unlock the device before listing files, set the autolock
+ to some large value or disabled if it disturbs you, you are
+ causing this to yourself.
+
* Samsung Android 2.3.x devices: these have a special MTP stack
with some specific bugs that we have maybe nailed down now.
It suffers from an "immediate connect" syndrome, i.e. you have
@@ -598,30 +579,19 @@ Here is what some people do:
6. Once mtp-detect gives you an "Ok", open either Rhythmbox or Gnomad2,
everything should work.
-Linux: Try this, if you have a recent Linux kernel,
-add the file (as root):
-
-/etc/modprobe.d/no-usb-storage.conf
-
-With the contents:
-
-options usb-storage quirks=1234:4321:i
-
-This will tell usb-storage to ignore this device when it's inserted
-so it is not hogged by the mass storage interfaces. Remove and re-insert
-the device and see if it works. Usually this does the trick.
-
-For older systems, or as a bigger hammer, run (as root) something
-like:
+Linux: Try this, if you have a recent 2.6.x Linux kernel,
+run (as root) something like:
> rmmod usb_storage ; mtp-detect
You can run most any command or a client like gnomad2 or
Amarok immediately after the rmmod command. This works
-sometimes. Another even more brutal approach is this:
+sometimes. Another way:
* Edit /etc/modprobe.d/blacklist
+
* Add the line "blacklist usb-storage"
+
* Reboot.
Now none of you USB disks, flash memory sticks etc will be
@@ -1028,45 +998,18 @@ builders summit, might come to recycle this:
- Protocol overview
- Transactional filesystem - no corruption due to unplugged cables!
- - The host and the device can access the files simultaneously, the
- device will always "own" the physical file system and proxy the
- host (MTP initiator).
- libmtp interface
- relation to libgphoto2
- User expectations fall short:
- Not really a mountable filesystem.
- Streaming does not work. (Size needs to be known beforehand due to
transactional nature.)
- - GVFS MTP backend to the rescue.
- Device sins
- - Using the same VID/PID for several modes, some of which are not MTP.
- HTC Zopo, HD2, Bird (0x0bb4/0x0c02). Thanks for that, now we cannot
- detect the protocol from just VID+PID but have to examine the interfaces.
- Android bugs
- Samsungs special Android MTP stack
- SonyEricsson Aricent stack for Xperia Androids pre 4.0, broken headers!
- Flat access model vs hierarchical, how Android uses MTP as an hierachical
file system while it was previously a flat database.
- - Old paradigm: scan the entire non-hierarchical storage for all content,
- build a cache to speed up the (USB 1.1!) link. Usually all files were
- stored in the root folder or a single folder named "/Music" or similar.
- - Android introduced deeply nested folder hierarchies, not seen before
- on MTP devices.
- - Microsoft not using the complete metadata dump feature of the MTP
- protocol (once introduced by creative) instead they walk directories
- separately.
- - So caching a big device will take long time and/or timeout.
- - Go-MTPFS (FUSE) and GVFS MTP - doing the partial directory walk rather
- than caching all files.
- - Especially Android devices nowadays assume that
- you want to index a folder at the time, whereas older MTP devices (such
- as those from Creative) would assume that you wanted to index the entire
- device as it was plugged in, and device firmware is now ever more tailored
- toward per-folder filetree walking. This makes it harder for the library
- to provide the right abstractions: do we provide an API for indexing the
- whole device which is unacceptably slow on new devices, or do we provide
- an API for indexing a directory at the time which will somehow work on
- older devices too? Shall we deprecate the older API?
- Detecting from vendor extension, can fix in newer extensions!
- Autoprobing on Linux
- Color devices do not like autoprobing
@@ -1075,8 +1018,7 @@ builders summit, might come to recycle this:
- Multimode USB - one PID for each mode due to Windows limitations not
applicable to Linux, SONY devices have ~5 different PIDs for a single
device.
- - Mode switch devices? Maybe we do this wrong.
-- MTPZ, came and went. Apparently deprecated by Microsoft with Windows
- Phone 8.
+ - Mode switch devices?
+- MTPZ
- Ideas??
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