mpd/src/ReplayGainConfig.cxx

/*
 * 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 "ReplayGainConfig.hxx"
#include "config/Param.hxx"
#include "config/ConfigGlobal.hxx"
#include "system/FatalError.hxx"

#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

ReplayGainMode replay_gain_mode = REPLAY_GAIN_OFF;

static constexpr bool DEFAULT_REPLAYGAIN_LIMIT = true;

float replay_gain_preamp = 1.0;
float replay_gain_missing_preamp = 1.0;
bool replay_gain_limit = DEFAULT_REPLAYGAIN_LIMIT;

const char *
replay_gain_get_mode_string(void)
{
	switch (replay_gain_mode) {
	case REPLAY_GAIN_AUTO:
		return "auto";

	case REPLAY_GAIN_OFF:
		return "off";

	case REPLAY_GAIN_TRACK:
		return "track";

	case REPLAY_GAIN_ALBUM:
		return "album";
	}

	assert(false);
	gcc_unreachable();
}

bool
replay_gain_set_mode_string(const char *p)
{
	assert(p != nullptr);

	if (strcmp(p, "off") == 0)
		replay_gain_mode = REPLAY_GAIN_OFF;
	else if (strcmp(p, "track") == 0)
		replay_gain_mode = REPLAY_GAIN_TRACK;
	else if (strcmp(p, "album") == 0)
		replay_gain_mode = REPLAY_GAIN_ALBUM;
	else if (strcmp(p, "auto") == 0)
		replay_gain_mode = REPLAY_GAIN_AUTO;
	else
		return false;

	return true;
}

void replay_gain_global_init(void)
{
	const struct config_param *param =
		config_get_param(ConfigOption::REPLAYGAIN);

	if (param != nullptr &&
	    !replay_gain_set_mode_string(param->value.c_str())) {
		FormatFatalError("replaygain value \"%s\" at line %i is invalid\n",
				 param->value.c_str(), param->line);
	}

	param = config_get_param(ConfigOption::REPLAYGAIN_PREAMP);

	if (param) {
		char *test;
		float f = strtod(param->value.c_str(), &test);

		if (*test != '\0') {
			FormatFatalError("Replaygain preamp \"%s\" is not a number at "
					 "line %i\n",
					 param->value.c_str(), param->line);
		}

		if (f < -15 || f > 15) {
			FormatFatalError("Replaygain preamp \"%s\" is not between -15 and"
					 "15 at line %i\n",
					 param->value.c_str(), param->line);
		}

		replay_gain_preamp = pow(10, f / 20.0);
	}

	param = config_get_param(ConfigOption::REPLAYGAIN_MISSING_PREAMP);

	if (param) {
		char *test;
		float f = strtod(param->value.c_str(), &test);

		if (*test != '\0') {
			FormatFatalError("Replaygain missing preamp \"%s\" is not a number at "
					 "line %i\n",
					 param->value.c_str(), param->line);
		}

		if (f < -15 || f > 15) {
			FormatFatalError("Replaygain missing preamp \"%s\" is not between -15 and"
					 "15 at line %i\n",
					 param->value.c_str(), param->line);
		}

		replay_gain_missing_preamp = pow(10, f / 20.0);
	}

	replay_gain_limit = config_get_bool(ConfigOption::REPLAYGAIN_LIMIT,
					    DEFAULT_REPLAYGAIN_LIMIT);
}

ReplayGainMode
replay_gain_get_real_mode(bool random_mode)
{
	ReplayGainMode rgm;

	rgm = replay_gain_mode;

	if (rgm == REPLAY_GAIN_AUTO)
	    rgm = random_mode ? REPLAY_GAIN_TRACK : REPLAY_GAIN_ALBUM;

	return rgm;
}