decoder/gme: add option "accuracy"

NEWS

@@ -14,6 +14,7 @@ ver 0.20 (not yet released)
 * decoder
   - ffmpeg: support ReplayGain and MixRamp
   - ffmpeg: support stream tags
+  - gme: add option "accuracy"
   - mad: reduce memory usage while scanning tags
   - mpcdec: read the bit rate
 * playlist

doc/user.xml

@@ -1749,6 +1749,28 @@ buffer_size: 16384</programlisting>
           Video game music file emulator based on <ulink
           url="https://bitbucket.org/mpyne/game-music-emu/wiki/Home"><application>game-music-emu</application></ulink>.
         </para>
+
+        <informaltable>
+          <tgroup cols="2">
+            <thead>
+              <row>
+                <entry>Setting</entry>
+                <entry>Description</entry>
+              </row>
+            </thead>
+            <tbody>
+              <row>
+                <entry>
+                  <varname>accuracy</varname>
+                  <parameter>yes|no</parameter>
+                </entry>
+                <entry>
+                  Enable more accurate sound emulation.
+                </entry>
+              </row>
+            </tbody>
+          </tgroup>
+        </informaltable>
       </section>
 
       <section>

src/decoder/plugins/GmeDecoderPlugin.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "GmeDecoderPlugin.hxx"
 #include "../DecoderAPI.hxx"
+#include "config/Block.cxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "fs/Path.hxx"
@@ -52,6 +53,23 @@ struct GmeContainerPath {
 	unsigned track;
 };
 
+#if GME_VERSION >= 0x000600
+static int gme_accuracy;
+#endif
+
+static bool
+gme_plugin_init(gcc_unused const ConfigBlock &block)
+{
+#if GME_VERSION >= 0x000600
+	auto accuracy = block.GetBlockParam("accuracy");
+	gme_accuracy = accuracy != nullptr
+		? (int)accuracy->GetBoolValue()
+		: -1;
+#endif
+
+	return true;
+}
+
 gcc_pure
 static unsigned
 ParseSubtuneName(const char *base)
@@ -123,6 +141,11 @@ gme_file_decode(Decoder &decoder, Path path_fs)
 		return;
 	}
 
+#if GME_VERSION >= 0x000600
+	if (gme_accuracy >= 0)
+		gme_enable_accuracy(emu, gme_accuracy);
+#endif
+
 	gme_info_t *ti;
 	gme_err = gme_track_info(emu, &ti, container.track);
 	if (gme_err != nullptr) {
@@ -274,7 +297,7 @@ static const char *const gme_suffixes[] = {
 extern const struct DecoderPlugin gme_decoder_plugin;
 const struct DecoderPlugin gme_decoder_plugin = {
 	"gme",
-	nullptr,
+	gme_plugin_init,
 	nullptr,
 	nullptr,
 	gme_file_decode,