decoder/mad: make "gapless_mp3_playback" a block option

Remove another dependency on the config/Global library.

NEWS

@@ -18,6 +18,7 @@ ver 0.21 (not yet released)
 * decoder
   - gme: try loading m3u sidecar files
   - hybrid_dsd: new decoder plugin
+  - mad: move "gapless_mp3_playback" setting to "decoder" block
   - pcm: support audio/L24 (RFC 3190)
 * resampler
   - soxr: flush resampler at end of song

doc/mpd.conf.5

@@ -127,14 +127,6 @@ This specifies the character set used for the filesystem.  A list of supported
 character sets can be obtained by running "iconv \-l".  The default is
 determined from the locale when the db was originally created.
 .TP
-.B gapless_mp3_playback <yes or no>
-This specifies whether to support gapless playback of MP3s which have the
-necessary headers.  Useful if your MP3s have headers with incorrect
-information.  If you have such MP3s, it is highly recommended that you fix them
-using vbrfix (available from <http://www.willwap.co.uk/Programs/vbrfix.php>)
-instead of disabling gapless MP3 playback.  The default is to support gapless
-MP3 playback.
-.TP
 .B save_absolute_paths_in_playlists <yes or no>
 This specifies whether relative or absolute paths for song filenames are used
 when saving playlists.  The default is "no".

doc/mpdconf.example

@@ -96,14 +96,6 @@
 #
 #log_level			"default"
 #
-# If you have a problem with your MP3s ending abruptly it is recommended that 
-# you set this argument to "no" to attempt to fix the problem. If this solves
-# the problem, it is highly recommended to fix the MP3 files with vbrfix
-# (available from <http://www.willwap.co.uk/Programs/vbrfix.php>), at which
-# point gapless MP3 playback can be enabled.
-#
-#gapless_mp3_playback			"yes"
-#
 # Setting "restore_paused" to "yes" puts MPD into pause mode instead
 # of starting playback after startup.
 #

doc/user.xml

@@ -3068,6 +3068,35 @@ run</programlisting>
           playback path to a DSD-capable DAC; for everybody else,
           playing back the ALAC copy of the file is better.
         </para>
+
+        <informaltable>
+          <tgroup cols="2">
+            <thead>
+              <row>
+                <entry>Setting</entry>
+                <entry>Description</entry>
+              </row>
+            </thead>
+            <tbody>
+              <row>
+                <entry>
+                  <varname>gapless</varname>
+                  <parameter>yes|no</parameter>
+                </entry>
+                <entry>
+                  This specifies whether to support gapless playback
+                  of MP3s which have the necessary headers.  Useful if
+                  your MP3s have headers with incorrect information.
+                  If you have such MP3s, it is highly recommended that
+                  you fix them using <ulink
+                  url="http://www.willwap.co.uk/Programs/vbrfix.php"><application>vbrfix</application></ulink>
+                  instead of disabling gapless MP3 playback.  The
+                  default is to support gapless MP3 playback.
+                </entry>
+              </row>
+            </tbody>
+          </tgroup>
+        </informaltable>
       </section>
 
       <section id="mad_decoder">

src/config/Migrate.cxx

@@ -56,8 +56,17 @@ MigrateCurlProxyConfig(ConfigData &config) noexcept
 				 "proxy_password");
 }
 
+static void
+MigrateMadConfig(ConfigData &config) noexcept
+{
+	MigrateParamToBlockParam(config, ConfigOption::GAPLESS_MP3_PLAYBACK,
+				 ConfigBlockOption::DECODER, "plugin", "mad",
+				 "gapless");
+}
+
 void
 Migrate(ConfigData &config) noexcept
 {
 	MigrateCurlProxyConfig(config);
+	MigrateMadConfig(config);
 }

src/config/Templates.cxx

@@ -68,7 +68,7 @@ const ConfigTemplate config_param_templates[] = {
 	{ "id3v1_encoding", false, true },
 	{ "metadata_to_use" },
 	{ "save_absolute_paths_in_playlists" },
-	{ "gapless_mp3_playback" },
+	{ "gapless_mp3_playback", false, true },
 	{ "auto_update" },
 	{ "auto_update_depth" },
 	{ "despotify_user", false, true },

src/decoder/plugins/MadDecoderPlugin.cxx

@@ -21,7 +21,7 @@
 #include "MadDecoderPlugin.hxx"
 #include "../DecoderAPI.hxx"
 #include "input/InputStream.hxx"
-#include "config/Global.hxx"
+#include "config/Block.hxx"
 #include "tag/Id3Scan.hxx"
 #include "tag/Rva2.hxx"
 #include "tag/Handler.hxx"
@@ -107,9 +107,9 @@ mad_fixed_to_24_buffer(int32_t *dest, const struct mad_synth *synth,
 }
 
 static bool
-mp3_plugin_init(gcc_unused const ConfigBlock &block)
+mp3_plugin_init(const ConfigBlock &block)
 {
-	gapless_playback = config_get_bool(ConfigOption::GAPLESS_MP3_PLAYBACK,
+	gapless_playback = block.GetBlockValue("gapless",
 					       DEFAULT_GAPLESS_MP3_PLAYBACK);
 	return true;
 }