0aee49bdf8
This updates the copyright header to all be the same, which is pretty much an update of where to mail request for a copy of the GPL and the years of the MPD project. This also puts all committers under 'The Music Player Project' umbrella. These entries should go individually in the AUTHORS file, for consistancy.
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* (c)2004 replayGain code by AliasMrJones
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*/
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#include "replay_gain.h"
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#include "conf.h"
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#include "audio_format.h"
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#include "pcm_volume.h"
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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static const char *const replay_gain_mode_names[] = {
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[REPLAY_GAIN_ALBUM] = "album",
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[REPLAY_GAIN_TRACK] = "track",
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};
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enum replay_gain_mode replay_gain_mode = REPLAY_GAIN_OFF;
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static float replay_gain_preamp = 1.0;
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void replay_gain_global_init(void)
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{
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const struct config_param *param = config_get_param(CONF_REPLAYGAIN);
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if (!param)
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return;
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if (strcmp(param->value, "track") == 0) {
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replay_gain_mode = REPLAY_GAIN_TRACK;
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} else if (strcmp(param->value, "album") == 0) {
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replay_gain_mode = REPLAY_GAIN_ALBUM;
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} else {
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g_error("replaygain value \"%s\" at line %i is invalid\n",
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param->value, param->line);
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}
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param = config_get_param(CONF_REPLAYGAIN_PREAMP);
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if (param) {
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char *test;
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float f = strtod(param->value, &test);
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if (*test != '\0') {
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g_error("Replaygain preamp \"%s\" is not a number at "
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"line %i\n", param->value, param->line);
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}
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if (f < -15 || f > 15) {
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g_error("Replaygain preamp \"%s\" is not between -15 and"
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"15 at line %i\n", param->value, param->line);
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}
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replay_gain_preamp = pow(10, f / 20.0);
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}
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}
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static float calc_replay_gain_scale(float gain, float peak)
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{
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float scale;
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if (gain == 0.0)
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return (1);
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scale = pow(10.0, gain / 20.0);
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scale *= replay_gain_preamp;
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if (scale > 15.0)
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scale = 15.0;
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if (scale * peak > 1.0) {
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scale = 1.0 / peak;
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}
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return (scale);
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}
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struct replay_gain_info *replay_gain_info_new(void)
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{
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struct replay_gain_info *ret = g_new(struct replay_gain_info, 1);
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for (unsigned i = 0; i < G_N_ELEMENTS(ret->tuples); ++i) {
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ret->tuples[i].gain = 0.0;
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ret->tuples[i].peak = 0.0;
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}
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/* set to -1 so that we know in replay_gain_apply to compute the scale */
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ret->scale = -1.0;
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return ret;
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}
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void replay_gain_info_free(struct replay_gain_info *info)
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{
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g_free(info);
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}
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void
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replay_gain_apply(struct replay_gain_info *info, char *buffer, int size,
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const struct audio_format *format)
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{
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if (replay_gain_mode == REPLAY_GAIN_OFF || !info)
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return;
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if (info->scale < 0) {
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const struct replay_gain_tuple *tuple =
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&info->tuples[replay_gain_mode];
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g_debug("computing ReplayGain %s scale with gain %f, peak %f\n",
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replay_gain_mode_names[replay_gain_mode],
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tuple->gain, tuple->peak);
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info->scale = calc_replay_gain_scale(tuple->gain, tuple->peak);
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}
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pcm_volume(buffer, size, format, pcm_float_to_volume(info->scale));
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}
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