Allocate the mixer object when it is configured.

Merged mixer_configure() into mixer_new().  mixer_new() was quite
useless anyway.

Don't use statically allocated mixer objects.

Return the default value in the conf_get_block_*() functions when
param==NULL was passed.

This simplifies a lot of code, because all initialization can be done
in one code path, regardless whether configuration is present.

All config_get_block_*() functions should accept constant config_param
pointers.

Document alsa_data members.

frame_size is a memory size and should be a size_t, not a signed integer.

Renamed types, functions, variables.

Two bugs here led to a large number of interrupts being generated on the
sound card when ALSA output is being used. Because we specify no default
period_time, the sound card gives us 3000 interrupts/sec rather than a more
sane 20 or 30. This completes the revert of dd7711 already started by
4ca24f.

The larger bug was in the change to config_get_block_unsigned() and using 0
as the default value for both 'buffer_time' and 'period_time'. This means
any pre-setting of these options in newAlsaData() gets wiped out. Add a new
default for period_time, and ensure default values for buffer_time and
period_time are used if none are provided by the user.
Signed-off-by: Dan McGee <dan@archlinux.org>
[mk: set defaults in newAlsaData() to fix auto-configuration; renamed
"_MS" back to "_US" because ALSA expects microseconds, not milliseconds]
Signed-off-by: Max Kellermann <max@duempel.org>

The null plugin synchronizes the playback so it will happen in real
time.  This patch adds a configuration option which disables this: the
playback will then be as fast as possible.  This can be useful to
profile MPD.

Free memory in the finish() method to make valgrind happy.

Renamed functions and variables.

Eliminate some more getBlockParam() invocations.

This replaces lots of getBlockParam() invocations.

Don't modify the configured string.

Determine the audio output name with audio_output_get_name() instead
of obtaining the name from the configuration again.

No "force" parameter, pass a default value instead.

Renamed functions, types, variables.

It returns bool, not int.

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.

This patch tryes to introduce pluggable mixer (struct mixer_plugin) along with some basic infrastructure (mixer_* functions). Instance of mixer (struct mixer) is used in
alsa and oss output plugin

All what's left in pcm_utils.h is the pcm_range() utility function,
which is only used internally by pcm_volume and pcm_mix.

"#ifdef G_BYTE_ORDER == G_BIG_ENDIAN" cannot work, of course.

g_strsplit() is more portable than strtok_r().

JACK documentation states: "The caller is responsible for calling
free(3) any non-NULL returned value."

This does not seem to include the array elements.  Duplicate them
after jack_get_ports(), and free only the array.  Convert
JackData.output_ports to non-const.

Use GLib's G_GNUC_UNUSED instead of gcc.h's mpd_unused.

Use GLib's G_GNUC_UNUSED instead of macros from gcc.h.