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/*
* Copyright (C) 2003-2010 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 "replay_gain_state.h"
#include "pcm_volume.h"
#include <glib.h>
#include <assert.h>
#include <math.h>
struct replay_gain_state {
float preamp, missing_preamp;
enum replay_gain_mode mode;
struct replay_gain_info *info;
float scale;
};
struct replay_gain_state *
replay_gain_state_new(float preamp, float missing_preamp)
{
struct replay_gain_state *state = g_new(struct replay_gain_state, 1);
state->preamp = preamp;
state->scale = state->missing_preamp = missing_preamp;
state->mode = REPLAY_GAIN_OFF;
state->info = NULL;
return state;
}
void
replay_gain_state_free(struct replay_gain_state *state)
{
assert(state != NULL);
if (state->info != NULL)
replay_gain_info_free(state->info);
g_free(state);
}
static float
calc_replay_gain_scale(float gain, float peak, float preamp)
{
float scale;
scale = pow(10.0, gain / 20.0);
scale *= preamp;
if (scale > 15.0)
scale = 15.0;
if (scale * peak > 1.0) {
scale = 1.0 / peak;
}
return (scale);
}
static void
replay_gain_state_calc_scale(struct replay_gain_state *state)
{
assert(state != NULL);
if (state->mode == REPLAY_GAIN_OFF || state->info == NULL)
return;
const struct replay_gain_tuple *tuple =
&state->info->tuples[state->mode];
if (replay_gain_tuple_defined(tuple)) {
g_debug("computing ReplayGain scale with gain %f, peak %f",
tuple->gain, tuple->peak);
state->scale = calc_replay_gain_scale(tuple->gain, tuple->peak,
state->preamp);
} else
state->scale = state->missing_preamp;
}
void
replay_gain_state_set_mode(struct replay_gain_state *state,
enum replay_gain_mode mode)
{
assert(state != NULL);
if (mode == state->mode)
return;
state->mode = mode;
replay_gain_state_calc_scale(state);
}
void
replay_gain_state_set_info(struct replay_gain_state *state,
const struct replay_gain_info *info)
{
assert(state != NULL);
if (state->info != NULL)
replay_gain_info_free(state->info);
state->info = info != NULL
? replay_gain_info_dup(info)
: NULL;
replay_gain_state_calc_scale(state);
}
void
replay_gain_state_apply(const struct replay_gain_state *state,
void *buffer, size_t size,
const struct audio_format *format)
{
assert(state != NULL);
if (state->mode == REPLAY_GAIN_OFF)
return;
pcm_volume(buffer, size, format, pcm_float_to_volume(state->scale));
}
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