ReplayGainConfig: add struct ReplayGainConfig, move globals to ReplayGainGlobal.cxx

src/ReplayGainGlobal.cxx

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2003-2016 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ReplayGainGlobal.hxx"
+#include "ReplayGainConfig.hxx"
+#include "config/Param.hxx"
+#include "config/ConfigGlobal.hxx"
+#include "util/RuntimeError.hxx"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <math.h>
+
+ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
+ReplayGainConfig replay_gain_config;
+
+static float
+ParsePreamp(const char *s)
+{
+	assert(s != nullptr);
+
+	char *endptr;
+	float f = strtod(s, &endptr);
+	if (endptr == s || *endptr != '\0')
+		throw std::invalid_argument("Not a numeric value");
+
+	if (f < -15 || f > 15)
+		throw std::invalid_argument("Number must be between -15 and 15");
+
+	return pow(10, f / 20.0);
+}
+
+static float
+ParsePreamp(const ConfigParam &p)
+{
+	try {
+		return ParsePreamp(p.value.c_str());
+	} catch (...) {
+		std::throw_with_nested(FormatRuntimeError("Failed to parse line %i",
+							  p.line));
+	}
+}
+
+void replay_gain_global_init(void)
+{
+	const auto *param = config_get_param(ConfigOption::REPLAYGAIN);
+
+	try {
+		if (param != nullptr)
+			replay_gain_mode = FromString(param->value.c_str());
+	} catch (...) {
+		std::throw_with_nested(FormatRuntimeError("Failed to parse line %i",
+							  param->line));
+	}
+
+	param = config_get_param(ConfigOption::REPLAYGAIN_PREAMP);
+	if (param)
+		replay_gain_config.preamp = ParsePreamp(*param);
+
+	param = config_get_param(ConfigOption::REPLAYGAIN_MISSING_PREAMP);
+	if (param)
+		replay_gain_config.missing_preamp = ParsePreamp(*param);
+
+	replay_gain_config.limit = config_get_bool(ConfigOption::REPLAYGAIN_LIMIT,
+						   ReplayGainConfig::DEFAULT_LIMIT);
+}