decoder/mikmod: sample rate is configurable

The new option "sample_rate" sets the sample rate for libmikmod.

NEWS

@@ -20,6 +20,7 @@ ver 0.16 (20??/??/??)
   - ffmpeg: convert metadata to generic format
   - sndfile: new decoder plugin based on libsndfile
   - flac: load external cue sheet when no internal one
+  - mikmod: sample rate is configurable
   - mpg123: new decoder plugin based on libmpg123
   - sidplay: support sub-tunes
   - sidplay: implemented songlength database

doc/user.xml

@@ -590,7 +590,35 @@ cd mpd-version</programlisting>
     <section>
       <title>Decoder plugins</title>
 
-      <para></para>
+      <section>
+        <title><varname>mikmod</varname></title>
+
+        <para>
+          Module player based on MikMod.
+        </para>
+
+        <informaltable>
+          <tgroup cols="2">
+            <thead>
+              <row>
+                <entry>Setting</entry>
+                <entry>Description</entry>
+              </row>
+            </thead>
+            <tbody>
+              <row>
+                <entry>
+                  <varname>sample_rate</varname>
+                </entry>
+                <entry>
+                  Sets the sample rate generated by
+                  <filename>libmikmod</filename>.  Default is 44100.
+                </entry>
+              </row>
+            </tbody>
+          </tgroup>
+        </informaltable>
+      </section>
     </section>
 
     <section>

src/decoder/mikmod_plugin.c

@@ -100,11 +100,20 @@ static MDRIVER drv_mpd = {
 	VC_VoiceRealVolume
 };
 
+static unsigned mikmod_sample_rate;
+
 static bool
-mikmod_decoder_init(G_GNUC_UNUSED const struct config_param *param)
+mikmod_decoder_init(const struct config_param *param)
 {
+	unsigned sample_rate;
 	static char params[] = "";
 
+	mikmod_sample_rate = config_get_block_unsigned(param, "sample_rate",
+						       44100);
+	if (!audio_valid_sample_rate(mikmod_sample_rate))
+		g_error("Invalid sample rate in line %d: %u",
+			param->line, sample_rate);
+
 	md_device = 0;
 	md_reverb = 0;
 
@@ -112,7 +121,7 @@ mikmod_decoder_init(G_GNUC_UNUSED const struct config_param *param)
 	MikMod_RegisterAllLoaders();
 
 	md_pansep = 64;
-	md_mixfreq = 44100;
+	md_mixfreq = mikmod_sample_rate;
 	md_mode = (DMODE_SOFT_MUSIC | DMODE_INTERP | DMODE_STEREO |
 		   DMODE_16BITS);
 
@@ -155,7 +164,7 @@ mikmod_decoder_file_decode(struct decoder *decoder, const char *path_fs)
 	/* Prevent module from looping forever */
 	handle->loop = 0;
 
-	audio_format_init(&audio_format, 44100, 16, 2);
+	audio_format_init(&audio_format, mikmod_sample_rate, 16, 2);
 	assert(audio_format_valid(&audio_format));
 
 	secPerByte =