/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * (c)2004 replayGain code by AliasMrJones * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "replay_gain.h" #include "conf.h" #include "audio_format.h" #include "pcm_utils.h" #include <glib.h> #include <stdlib.h> #include <string.h> #include <math.h> static const char *const replay_gain_mode_names[] = { [REPLAY_GAIN_ALBUM] = "album", [REPLAY_GAIN_TRACK] = "track", }; enum replay_gain_mode replay_gain_mode = REPLAY_GAIN_OFF; static float replay_gain_preamp = 1.0; void replay_gain_global_init(void) { ConfigParam *param = getConfigParam(CONF_REPLAYGAIN); if (!param) return; if (strcmp(param->value, "track") == 0) { replay_gain_mode = REPLAY_GAIN_TRACK; } else if (strcmp(param->value, "album") == 0) { replay_gain_mode = REPLAY_GAIN_ALBUM; } else { g_error("replaygain value \"%s\" at line %i is invalid\n", param->value, param->line); } param = getConfigParam(CONF_REPLAYGAIN_PREAMP); if (param) { char *test; float f = strtod(param->value, &test); if (*test != '\0') { g_error("Replaygain preamp \"%s\" is not a number at " "line %i\n", param->value, param->line); } if (f < -15 || f > 15) { g_error("Replaygain preamp \"%s\" is not between -15 and" "15 at line %i\n", param->value, param->line); } replay_gain_preamp = pow(10, f / 20.0); } } static float calc_replay_gain_scale(float gain, float peak) { float scale; if (gain == 0.0) return (1); scale = pow(10.0, gain / 20.0); scale *= replay_gain_preamp; if (scale > 15.0) scale = 15.0; if (scale * peak > 1.0) { scale = 1.0 / peak; } return (scale); } struct replay_gain_info *replay_gain_info_new(void) { struct replay_gain_info *ret = g_new(struct replay_gain_info, 1); for (unsigned i = 0; i < G_N_ELEMENTS(ret->tuples); ++i) { ret->tuples[i].gain = 0.0; ret->tuples[i].peak = 0.0; } /* set to -1 so that we know in replay_gain_apply to compute the scale */ ret->scale = -1.0; return ret; } void replay_gain_info_free(struct replay_gain_info *info) { g_free(info); } void replay_gain_apply(struct replay_gain_info *info, char *buffer, int size, const struct audio_format *format) { if (replay_gain_mode == REPLAY_GAIN_OFF || !info) return; if (info->scale < 0) { const struct replay_gain_tuple *tuple = &info->tuples[replay_gain_mode]; g_debug("computing ReplayGain %s scale with gain %f, peak %f\n", replay_gain_mode_names[replay_gain_mode], tuple->gain, tuple->peak); info->scale = calc_replay_gain_scale(tuple->gain, tuple->peak); } pcm_volume(buffer, size, format, pcm_float_to_volume(info->scale)); }