When libvorbis knows that a song is seekable, it seeks around like
crazy in the file before starting to decode it.  This is very
expensive on remote HTTP resources, and delays MPD for 10 or 20
seconds.

This patch disables seeking on remote songs, because the advantages of
quickly playing a song seem to weigh more than the theoretical ability
of seeking for most MPD users.  If users feel this feature is needed,
we will make a configuration option for that.

Decoder plugins must not send partial frames.

Due to rounding errors, it was possible that the fallback resampler
returned partial frames.

getBoolConfigParam() returns an int.  It is not possible to check for
CONF_BOOL_UNSET after it has been assigned to a bool; use a temporary
int value for that.

Older gcc versions complained about shadowed parameters in prototypes.

It returns bool, not int.

When MPD starts without audio output configuration, the "param"
variable is NULL.  This triggers a segmentation fault in both mixer
plugins.

When tremor (libvorbisidec) is used, HAVE_OGGVORBIS was not defined.

This patch allows mpd to recognise the albumartist tag in the way
foobar2000 and others write it to files.

Splitted flac_copy_vorbis_comment() into flac_copy_comment() and
flac_copy_comment().

Simplify flac_copy_vorbis_comment() by moving the comment
identification code out.

Free the tag object when it turns out to be empty.  This simplifies
several functions and APIs.

tag_is_defined() checks whether there is any information in the tag
object.

Use tag_is_empty() instead.

Renamed types, functions, variables.

Calling input_curl_select() after EOF has been reached causes an
assertion failure.  This can happen if the HTTP response is empty.
Check c->eof before calling input_curl_select().

Set the "ready" flag for empty resources.

To check for early connect failures, call curl_multi_info_read() in
the constructor input_curl_open().  This fixes an assertion failure.

Copy changelog items from the upcoming 0.14.1 release.

g_queue_clear() was introduced in GLib 2.14.  Add a macro hack for
older GLib versions to emulate it.

gcc doesn't know that g_error() never returns.  Work around the gcc
warning.

g_get_user_special_dir() was introduced with GLib 2.14.  Don't use it
in older versions.

dest_size is only used in an assertion.  Remove its declaration and
move the formula into the assertion.

In NDEBUG, the parameter "decoder" is not used.

The function ipv6Supported() is not used at all when IPv6 support was
disabled at compile time.

This patch allows mpd to recognise the albumartist tag in the way foobar2000
and others write it to files.

Sorting songs by file name does not make much sense.  Most of the
time, users want to add songs in track order to the playlist.

Path names in the directory and song structs are always encoded in
UTF-8.  Don't use strcmp(), it cannot handle UTF-8 characters
properly.  Use GLib's UTF-8 aware g_utf8_collate() function for that.

I was having problems with shoutcast stream outputs before applying
the attached patch, which enlarges the shoutcast output
buffer. Ideally, this should be configurable, but this resolves the
issue for my needs.

Don't depend on the daemon's locale settings.  Comment names are
ASCII.

vorbis_parse_comment() should be a function which converts one comment
to a tag item.  It should do everything required to do the conversion,
including looping over all possible tag types.

Eliminate some duplicate code.

Always allocate a new tag object before parsing the vorbis comments;
free it when it turns out to be empty.  This simplifies the code a
bit.

Renamed functions and variables.

Make ogg_parseCommentAddToTag() return bool instead of unsigned int.