No CamelCase file names.

input_curl.h was missing in the tarball because it was not listed in
$(mpd_headers).

MPD used to have a copy of the mp4ff library.  Since that has been
removed, AAC suport was disabled when there was no libmp4ff.  Separate
the libmp4ff test, and enable AAC support no matter if libmp4ff is
available.

Cleaning up artifacts from a merge gone wrong.  Also remove the
ringbuf library, which is not being used.

No CamelCase in the file name.  The output_buffer struct is going to
be renamed to music_pipe.  There are so many buffer levels in MPD, and
calling this one "output buffer" is wrong, because it's not the last
buffer before the music reaches the output devices.

Removed duplicated code.

The "simple singly-linked-list" library has been replaced with GLib's
GList and GQueue.

Don't compile the sources of disabled output plugins at all.

Renamed inputStream.c and inputStream_file.c.

MPD's HTTP client code has always been broken, no matter how effort
was put into fixing it.  Replace it with libcurl, which is known to be
quite stable.  This adds a fat library dependency, but only for people
who need streaming.

Again, no CamelCase in the directory name.

These plugins are not input plugins, they are decoder plugins.  No
CamelCase in the directory name.

MPD shouldn't integrate sources of other libraries.  Since libmp4ff is
part of libfaad, we should remove the old copy from src/mp4ff and link
with the current version from libfaad instead.

Separate code from pcm_utils.c to keep it small and simple.

Separate the resampling code from the rest of pcm_utils.c.  Create two
sub-libraries: pcm_resample_libsamplerate.c and
pcm_resample_fallback.c.

Copied and adapted code from the mp3 decoder plugin.  This library now
replaces the old and low-quality function pcm_convert_24_to_16().

No CamelCase in file names.

[mk: fixed indent, changed copyright statement, added autoconf test,
fixed includes paths, fixed 2 gcc warnings, don't close input stream
twice]

Don't compile the sources of disabled decoder plugins at all, and
don't attempt to register these.

If a feature is disabled, don't compile the source file at all,
disable it completely in Makefile.am instead.

Detect the following libraries with pkg-config: libshout, libid3tag,
libmad.

The switch from ogg.m4 to pkg-config intentionally disabled
libvorbisenc.  Enable it when shout_ogg is used.

This patch fixes several imports to use pkg-config instead of certain
esoteric tests.

GLib provides an easier API for character set conversion than iconv().
Use g_convert() / g_convert_with_fallback() for all character
conversions.  We should optimize the path.h API later to return a
newly allocated buffer, so we can just pass GLib's return value.

GLib is a nice and portable utility library.  We are going to use it
from now on, and eliminate a lot of duplicated code from MPD.  Why
invent the wheel again and again?

"idle" waits until something noteworthy happens on the server,
e.g. song change, playlist modified, database updated.  This allows
clients to keep up to date without polling.

The mapper library maps directory and song objects to file system
paths.  With this central library, the code mixture in path.c should
be cleaned up, and we will be able to add neat features like aliasing.

playlist_print_song() and playlist_print_uri() handle charset
conversion and (optional) music directory prefixing.

Remove clutter from directory.c.  Everything which saves or loads
to/from the hard disk goes to directory_save.c, and code which sends
directory information to the client is moved into directory_print.c.

Taming the directory.c monster, part II: move the database management
stuff to database.  directory.c should only contain code which works
on directory objects.

The source directory.c mixes several libraries: directory object
management, database management and database update, resulting in a
1000+ line monster.  Move the whole database update code to update.c.

Having all functions as static (non-inline) functions generates GCC
warnings, and duplicates binary code across several object files.
Most of dirvec's methods are too complex for becoming inline
functions.  Move them all to dirvec.c and publish the prototypes in
dirvec.h.

* Add missing headers in Makefile.am
* remove mp4ff.dsp (Win32 crap)
* Add scripts, m4, bs, autogen.sh to allow for hotfixes by the
  SCM-challenged.  (downloading the source via git is NOT a
  lightweight operation for everybody).

Since we use a C99 compiler now, we can assert that the C99 standard
headers are available, no need for complicated compile time checks.
Kill mpd_types.h.

Small memory reduction compared to songvec since most users have
much fewer dirs than songs, but still nice to have.

We have eliminated direct accesses to the audio_output struct from
the all output plugins.  Make it opaque for them, and move its real
declaration to output_internal.h, similar to decoder_internal.h.

Pass the opaque structure to plugin.init() only, which will return the
plugin's data pointer on success, and NULL on failure.  This data
pointer will be passed to all other methods instead of the
audio_output struct.

Reduce direct accesses to the audio_output struct from the plugins:
this time, eliminate all accesses to audio_output.name.  The name is
required by some plugins for log messages.

To keep I/O nastiness and latencies away from the core, move the audio
output code to a separate thread, one per output.  The thread is
created on demand, and currently runs until mpd exits.

Our linked-list implementation is wasteful and the
SongList isn't modified enough to benefit from being a linked
list.  So use a more compact array of song pointers which
saves ~200K on a library with ~9K songs (on x86-32).

[mk: moved this patch after "Refactor and cleanup of shout Ogg and MP3
audio outputs".  The original commit message follows, although it is
outdated:]

Creation of shout_mp3 audio output plugin. Basically I just copied the
existing shout plugin and replaced ogg with lame. Uses lame for mp3
encoding. Next step is to pull common functionality out of each shout
plugin and share it between them.

Configuration options for "shout_mp3" are the same as for "shout".