Commit dbc02c24 authored by Jeremy Bicha's avatar Jeremy Bicha

New upstream version 2.9.39

parents 1ae07919 b5af6877
Andre Moreira Magalhaes <andrunko[@]>
Jonathan Matthew <jonathan[@]>
William Jon McCann <jmccann[@]>
W. Michael Petullo <mike[@]>
Charles Schmidt <cschmidt2[@]>
Alexandre Rosenfeld <alexandre.rosenfeld[@]>
Noah Alcantara <black.ic[@]>
A GObject-based DAAP library was first written as a plugin for
Rhythmbox by Charles Schmidt. This work was done as a part of the
2005 Google Summer of Code program. A few other developers, most
notably Jonathan Matthew and William Jon McCann, contributed to the
DAAP plugin after it was integrated into the Rhythmbox project.
Later, Andre Magalhaes expanded Charles' code into a general purpose
DMAP library, libdmapsharing. This library was used by a product
called Canola and was available on SourceForge. The Canola project
dropped support for DMAP before releasing its second version and
the development of the libdmapsharing library stopped. At this
point, libdmapsharing supported the client side of the DMAP protocol.
W. Michael Petullo pulled the libdmapsharing sources from SourceForge
in December of 2008. He began to add support for the server side of
the DMAP protocol, pulling the latest DAAP sharing code from Rhythmbox
and modifying it to support DPAP. Mike's changes were merged back into
the SourceForge in January of 2009 after he was made a member of the
libdmapsharing development team. The libdmapsharing project was moved
from SourceForge to GNOME Git in August of 2009.
Alexandre Rosenfeld added initial DACP support to libdmapsharing while
working on his 2010 Google Summer of Code project.
Noah Alcantara contributed client-side support for mDNS/DNS-SD on Mac
OS X early in 2011.
The original authors of Rhythmbox's DAAP plugin have endorsed the
re-licensing of their code to LGPL in the following two emails:
Date: Sun, 11 Jan 2009 14:46:35 -0500
From: Charles Schmidt <cschmidt2[@]>
To: "W. Michael Petullo" <mike[@]>
Subject: Re: LGPL of Rhythmbox DAAP Code
Cc: "cschmidt2[@]" <cschmidt2[@]>,
"jmccann[@]" <jmccann[@]>,
"jonathan[@]" <jonathan[@]>
Totally fine by me. Is there a website or vcs I can look at?
Charlie Schmidt
On Jan 11, 2009, at 2:30 PM, "W. Michael Petullo" <mike[@]> wrote:
> Charles, Jon & Jonathan,
> I recently began maintaining the libdmapsharing library, a DMAP
> library originally based on Rhythmbox's DAAP plugin. The library is
> distributed under the LGPL license. Your original work was
> distributed under the GPL.
> The original maintainer of libdmapsharing has stated that he
> obtained permission from you regarding the relicensing of your code
> to the LGPL. If you do not have any objections, would each of you
> provide me with a brief statement to this effect that I may formally
> distribute with libdmapsharing?
> The following files were used in developing libdmapsharing:
> rb-daap-connection.c
> rb-daap-connection.h
> rb-daap-hash.c
> rb-daap-hash.h
> rb-daap-mdns-avahi.c
> rb-daap-mdns-avahi.h
> rb-daap-mdns-browser-avahi.c
> rb-daap-mdns-browser.h
> rb-daap-mdns-publisher-avahi.c
> rb-daap-mdns-publisher.h
> rb-daap-share.c
> rb-daap-share.h
> rb-daap-structure.c
> rb-daap-structure.h
> Thank you.
> Sincerely,
> Mike Petullo
Date: Wed, 14 Jan 2009 21:00:45 +1000
From: Jonathan Matthew <jonathan[@]>
To: "W. Michael Petullo" <mike[@]>
Subject: Re: LGPL of Rhythmbox DAAP Code
On Sun, Jan 11, 2009 at 02:30:15PM -0500, W. Michael Petullo wrote:
> Charles, Jon & Jonathan,
> I recently began maintaining the libdmapsharing library, a DMAP library
> originally based on Rhythmbox's DAAP plugin. The library is distributed
> under the LGPL license. Your original work was distributed under the GPL.
> The original maintainer of libdmapsharing has stated that he obtained
> permission from you regarding the relicensing of your code to the LGPL.
> If you do not have any objections, would each of you provide me with a
> brief statement to this effect that I may formally distribute with
> libdmapsharing?
sure, why not.
Alexandre Rosenfeld also confirmed that the GPL notice on dacp-player.[ch]
was not intentional:
Sure, sorry about that, I used a template for that code, it was never my
intention to make it GPL....
*Alexandre Rosenfeld*
On Fri, Sep 3, 2010 at 14:46, W. Michael Petullo <> wrote:
> Alexandre,
> I just noticed that dacp-player.[ch] are licensed as GPL. This should
> be LGPL because libdmapsharing is LGPL. May I have your permission to
> change the license of these files to LGPLv2.1+?
Andre Moreira Magalhaes approved the use of LGPL for test-dmap-client.c.
Please do it, no problem at all
> Andre,
> I have been maintaining libdmapsharing and recently noticed that
> tests/test-dmap-client.c and test-dmap-server.c are licensed as
> GPL and you are the copyright holder. May I change this to LGPLv2.1+ in
> order to match the rest of libdmapsharing? This will make distribution
> easier as packages may be licensed at LGPLv2.1+ only.
> --
> Mike
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SUBDIRS = libdmapsharing vala tests doc
# pcfiles = libdmapsharing-@LIBDMAPSHARING_MAJORMINOR@.pc
pcfiles = libdmapsharing-@API_VERSION@.pc
pkgconfigdir = $(libdir)/pkgconfig
pkgconfig_DATA = $(pcfiles)
libdmapsharing-@API_VERSION@-uninstalled.pc \
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Libdmapsharing is a library which allows programs to access, share
and control the playback of media content using DMAP (DAAP, DPAP &
DACP). Libdmapsharing also detects audio AirPlay services; coupled
with the AirPlay support in PulseAudio or GStreamer, this can allow an
application to stream audio to an AirPlay device. The library presently
supports Linux and other POSIX-based systems. It is written in C using
GObject and libsoup. The DMAP family of protocols are used by products
such as Apple iTunes, Apple iPhoto, and the Roku SoundBridge family to
share media such as music and photos.
For documentation on libdmapsharing's API,
please refer to the API documentation, available at or with the
libdmapsharing source code.
This documents the effort to make dmapd and libdmapsharing more memory
efficient. This document describes work done in both libdmapsharing and
dmapd, because dmapd is the primary application of libdmapsharing's
server-side functionality.
I found that dmapd used a significant amount of heap space while trying to
port dmapd to OpenWRT on a WRT160NL router with 32 Megabytes of RAM. A
2,419-song library caused dmapd on x86_64 to use 7,413,760 bytes of heap
space after reading the library into memory. Furthermore, connecting to
dmapd using a DAAP client and receiving a list of songs caused heap usage
to increase to over 10 Megabytes. Note that this memory usage might be
smaller on the WRT160NL due to its 32-bit architecture, but it is still
significant in size.
After attempting to optimize memory use, I measured the following on
OpenWrt / WRT160NL (*** BUT WITH NO METADATA READ! ***):
Heap, after music is loaded: 0xf5000 (1,003,520)
Heap, after client received song list: 0x926000 (9,592,832)
Heap, after music is loaded: 0x2d3000 (2,961,408)
Heap, after client received song list: 0xafa000 (11,509,760)
I use the following tools to troubleshoot memory issues:
grep heap /proc/PID/maps (current heap size)
valgrind / memcheck (memory leaks)
valgrind / massif (max heap size and memory over time)
objdump -t OBJECT-FILE | grep -e "\.bss" -e "\.data" | sort -k5
| c++filt | tail
I have made the following changes in order to make dmapd more memory
1. Replace the hash table-based DMAPDb implementation with a Berkeley
Database implementation. Currently measuring the memory use compared to
the in-memory database.
2. Fixed several memory leaks after analyzing with valgrind.
Heap without client connection: 3,940,352 bytes
3. Implement database cache so that dmapd does not need to use GStreamer
to read media metadata each time it is run.
Heap without client connection using DB cache: 3,346,432 bytes
4. Replace the DMAPDb in the DMAPContainerRecord implementation with a
GSList of ID's.
Heap without client connection using DB cache: 4,759,552 bytes
5. Implement "stringletons" and fix errors in 4) above.
Heap without client connection using DB cache: 2,854,912 bytes
Heap without client connection: 3,518,464 bytes
Heap after client connection and song list: 6,864,896 bytes
Max heap usages (massif): 8,945,760 bytes
6. Modify libdmapsharing so that it responds to "/1/items" requests in
chunks, avoiding the need to build the entire response in memory.
The effectiveness of this can be measured by observing the
maximum heap usage after a client has asked for a full media
list. Previous to this change, dmapd would use 7,811,072 bytes
of heap to describe a 2,232-song library. After this change,
dmapd's usage was 3,665,920 bytes, a very small increase over
the memory used by dmapd immediately after starting.
7. Write a disk-based database for dmapd.
In order to minimize the memory used by a newly started dmapd,
I wrote a disk-based DMAPDb backend. This backend stores all
database data in files and avoids storing the entire database
in memory. To measure the effectiveness, I measured the memory
usage of dmapd after loading a 3,276-photograph library (note
that thumbnails are especially problematic). The GHashTable-based
database used 35,885,056 bytes of heap space. The disk-based
database used 4,763,648 bytes.
8. Decompressing multiple scan JPEG's.
VIPS must decompress multiple scan JPEG's fully in memory due
to the way libjpeg works. Either 1) use embedded EXIF thumbnail
or 2) skip.
= Short term ===================================================================
344616: support database updates
686220: play nicely with firewalld
705539: confirm two share scenario fixed (seems to be in rhythmbox 3.0.2)
727839: wierd startup warning
705949: grilo
Noah: DNS-SD implementation
Finish browser side support.
Improve content (Noah?)
Fix alignment of object description code
Fix "up" icon in second level pages
Add standard sidebar
Improve aesthetics
= Mid term =====================================================================
Fix callbacks so that they do not provide a gpointer (see service-added
callback). They need to provide a proper GObject type (e.g., a new
DMAPMdnsBrowserService type) so that Python/GObject introspection works.
Noah: Comment purpose of each source file and describe interfaces, using test
programs as examples (Note: wait on doxygen vs. gtk-doc decision.
Mike: Realtime transcode: must g_input_stream_close what is returned from
daap_record_read, unless I change API (see also dmapd.c)
= Long term ====================================================================
API Changes:
now_playing_artwork seems to return a filename, so should return a gchar *, not guchar *?
Stuff related to Python introspection
Allow single client to more easily make use of both DAAP and DPAP (embed type in browser service?)
Mike: Audit remaining GSoC patch:
--- dmap-db.c
--- dmap-share.c
--- dacp-player.c
--- dacp-player.h
--- dacp-share.c
--- dacp-share.h
Mike: Add support for browse= on DMAPConnection side to filter results (see dmap-share.c).
Mike: Functions that could be simplified:
apply_filter()/_dmap_share_build_filter() (lex/yacc?)
Mike: Add support for DMAP_CC_MSUP, dmap.supportsupdate
Something odd (as best as I can remember):
TunesRemote+ on Android emulator
Ryhthmbox on same machine
Two network interfaces (i.e., _touch-remote._tcp listed twice by avahi-browse)
Remote listed twice
If "wrong" remote selected:
entry_insert_text_cb has service_name set to garbled value
mdns_remote_added has service_name set to correct value
Mike: Where to handle DACP-specific stuff in dmap-mdns-browser-avahi.c?
Mike: Does, e.g., handle_server_info need user_data parameter?
Mike: Replace dmap-md5.[ch] with GChecksum.
Mike: Ensure client test catches newly shared files?
Mike: Do transcode based on client?
Mike: Fix seeking.
Mike: Clean up test_dmap_server.
Fix code that determines path of test.jpeg.
Mike: See FIXME's in dmap-share.c, daap-share.c, daap-record.c and dpap-share.c.
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