The ffmpeg library supports the "True Audio Codec".  The entry in
ffmpeg_suffixes was missing.

When MPD is not playing, it may still remember which is the "current"
song.  When you switch to "random" mode, MPD will always start playing
exactly this song.  This defies the goal of "random" mode a little.
Clear the "current" song when MPD is not playing during the "random"
mode switch.

The output_command library provides a command interface to the audio
outputs.  It assumes the input comes from an untrusted source
(i.e. the client) and verifies all parameters.

In addition to audio_format_valid(), provide functions which validate
only one attribute of an audio_format.  These functions are reused by
audio_format_parse().

Added audio_format_parse() in a separate library, with a modern
interface: return a GError instead of logging errors.  This allows the
caller to deal with the error.

When MPD explicitly starts playing, ignore the "REOPEN_AFTER" timeout.
This timeout was useful when MPD attempted to reopen a failed device
over and over, but it confuses users when they explicitly tell MPD to
start playing, while MPD insists to wait for the 10 seconds to pass.

Merge some duplicate code into one function.

When the pause() method fails, leave the pause loop, because calling
pause() on a closed device is not allowed.

Fix a memory leak: it was not guaranteed that pcm_convert_deinit() was
called for each pcm_convert_init().  This patch always (de)initializes
the pcm_convert library when the audio_output.open flag is flipped.

Renamed audio_output struct members.

Use audio_format_frame_size() instead of
channels*audio_format_sample_size().

Pass the music chunk as a "const void *" to the encoder, instead of a
"const char *".  Actually, both encoders currently expect 16 bit
samples, passing a 8-bit character is rather pointless.

For simplification, moved the PCM conversion code to
pcm16_to_ogg_buffer().  Work with a int16_t pointer instead of a char
pointer.

writeSize is a memory size and its type should thus be size_t.  This
allows us to remove two explicit casts.

Nobody needs these debug messages anymore.

audio_output_all_finished() returns bool, not int.

Renamed functions and variables.

Moved code which deals with all audio outputs at once into a separate
library.

This function isn't used anymore.

The crossfading code shouldn't depend on the audio output code.  Pass
the current audio format to cross_fade_calc() and let it compare
directly, instead of using isCurrentAudioFormat().

When MPD is stopped, but the last song is still the "current song",
and you delete it, playlist->current is not updated, and becomes an
invalid value.  Fix this by catching "!playlist->playing &&
playlist->current == (int)songOrder".

Added audio_output_get(), audio_output_find().

audio_output_config_count() returns the number of audio outputs in the
configuration file.  It is only used by initAudioDriver().  The public
function audio_output_count() now returns audioOutputArraySize.

output_api.h is required for enum audio_output_command.

Assertions on pc.command and pc.next_song.

When we reset pc.next_song if there is no song queued, this might
cause a race condition: the next song to be played is cleared, while
pc.command was already set.  Clear the "next_song" only if there is a
song queued for the current do_play() invocation.

If a new song is queued before calling playerSeek(), then the player
and the playlist enter an inconsistent state, because the player
discards the playlist's "queued" song in favor of the seeked song.

Call playlist_update_queued_song() after playerSeek().

After a player command (successful or not), reset pc.next_song,
because the queue is supposed to be empty then.  Otherwise,
playlist.queued and pc.next_song may disagree, which triggers an
assertion failure.

Commit f78cddb4 introduced a regression: after a song was moved, the
order array was not updated (in random mode).  This caused MPD to
think the "current" song has changed when you moved something to the
position of the current song.

Don't define HAVE_FFMPEG if the ffmpeg libraries were found via
pkg-config, but ffmpeg support was disabled because
avcodec_decode_audio2() is not available.

Check if the "current+1" position is actually valid.

Including "../config.h" breaks on some systems.

Always assume the buffer is empty before calling the encoder.  Always
flush the buffer immediately after there has been added something.
This reduces the risk of buffer overruns, because there will never be
a "rest" in the current buffer.

Don't duplicate the tag received by the send_metadata() method - send
it to the shout server directly.

Removed the manual timer synchronization from the shout plugin.
libshout's shout_sync() function does it for us.

The non-blocking mode of libshout is sparsely documented, and MPD's
implementation had several bugs.  Also removed connect throttling
code, that is done by the MPD core since 0.14.