Backwards compatibility with older libopenmpt versions than 0.5

src/decoder/plugins/OpenmptDecoderPlugin.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "OpenmptDecoderPlugin.hxx"
+#include "decoder/Features.h"
 #include "ModCommon.hxx"
 #include "../DecoderAPI.hxx"
 #include "input/InputStream.hxx"
@@ -43,7 +44,9 @@ static bool openmpt_override_mptm_interp_filter;
 static int openmpt_volume_ramping;
 static bool openmpt_sync_samples;
 static bool openmpt_emulate_amiga;
+#ifdef HAVE_LIBOPENMPT_VERSION_0_5
 static std::string_view openmpt_emulate_amiga_type;
+#endif
 
 static bool
 openmpt_decoder_init(const ConfigBlock &block)
@@ -54,7 +57,9 @@ openmpt_decoder_init(const ConfigBlock &block)
 	openmpt_volume_ramping = block.GetBlockValue("volume_ramping", -1);
 	openmpt_sync_samples = block.GetBlockValue("sync_samples", true);
 	openmpt_emulate_amiga = block.GetBlockValue("emulate_amiga", true);
+#ifdef HAVE_LIBOPENMPT_VERSION_0_5
 	openmpt_emulate_amiga_type = block.GetBlockValue("emulate_amiga_type", "auto");
+#endif
 
 	return true;
 }
@@ -83,9 +88,14 @@ mod_decode(DecoderClient &client, InputStream &is)
 		mod.set_render_param(mod.RENDER_INTERPOLATIONFILTER_LENGTH, 0);
 	}
 	mod.set_render_param(mod.RENDER_VOLUMERAMPING_STRENGTH, openmpt_volume_ramping);
+#ifdef HAVE_LIBOPENMPT_VERSION_0_5
 	mod.ctl_set_boolean("seek.sync_samples", openmpt_sync_samples);
 	mod.ctl_set_boolean("render.resampler.emulate_amiga", openmpt_emulate_amiga);
 	mod.ctl_set_text("render.resampler.emulate_amiga_type", openmpt_emulate_amiga_type);
+#else
+	mod.ctl_set("seek.sync_samples", std::to_string(openmpt_sync_samples));
+	mod.ctl_set("render.resampler.emulate_amiga", std::to_string(openmpt_emulate_amiga));
+#endif
 
 	static constexpr AudioFormat audio_format(OPENMPT_SAMPLE_RATE, SampleFormat::FLOAT, 2);
 	assert(audio_format.IsValid());

src/decoder/plugins/meson.build

@@ -110,6 +110,7 @@ endif
 
 libopenmpt_dep = dependency('libopenmpt', required: get_option('openmpt'))
 decoder_features.set('ENABLE_OPENMPT', libopenmpt_dep.found())
+decoder_features.set('HAVE_LIBOPENMPT_VERSION_0_5', libopenmpt_dep.version().version_compare('>= 0.5'))
 if libopenmpt_dep.found()
   decoder_plugins_sources += [
     'OpenmptDecoderPlugin.cxx',