0e183d3fa1
The replay_gain_state struct holds the precalculated scale factor, which is removed from struct replay_gain_info.
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
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* Copyright (C) 2003-2010 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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#include "config.h"
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#include "replay_gain_state.h"
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#include "pcm_volume.h"
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#include <glib.h>
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#include <assert.h>
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#include <math.h>
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struct replay_gain_state {
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float preamp, missing_preamp;
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enum replay_gain_mode mode;
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struct replay_gain_info *info;
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float scale;
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};
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struct replay_gain_state *
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replay_gain_state_new(float preamp, float missing_preamp)
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{
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struct replay_gain_state *state = g_new(struct replay_gain_state, 1);
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state->preamp = preamp;
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state->missing_preamp = missing_preamp;
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state->mode = REPLAY_GAIN_OFF;
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state->info = NULL;
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return state;
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}
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void
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replay_gain_state_free(struct replay_gain_state *state)
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{
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assert(state != NULL);
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if (state->info != NULL)
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replay_gain_info_free(state->info);
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g_free(state);
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}
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static float
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calc_replay_gain_scale(float gain, float peak, float preamp)
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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 *= 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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static void
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replay_gain_state_calc_scale(struct replay_gain_state *state)
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{
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assert(state != NULL);
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if (state->mode == REPLAY_GAIN_OFF || state->info == NULL)
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return;
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const struct replay_gain_tuple *tuple =
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&state->info->tuples[state->mode];
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g_debug("computing ReplayGain scale with gain %f, peak %f",
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tuple->gain, tuple->peak);
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state->scale = calc_replay_gain_scale(tuple->gain, tuple->peak,
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state->preamp);
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}
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void
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replay_gain_state_set_mode(struct replay_gain_state *state,
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enum replay_gain_mode mode)
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{
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assert(state != NULL);
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if (mode == state->mode)
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return;
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state->mode = mode;
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replay_gain_state_calc_scale(state);
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}
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void
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replay_gain_state_set_info(struct replay_gain_state *state,
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const struct replay_gain_info *info)
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{
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assert(state != NULL);
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if (state->info != NULL)
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replay_gain_info_free(state->info);
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state->info = info != NULL
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? replay_gain_info_dup(info)
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: NULL;
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replay_gain_state_calc_scale(state);
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}
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void
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replay_gain_state_apply(const struct replay_gain_state *state,
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void *buffer, size_t size,
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const struct audio_format *format)
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{
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assert(state != NULL);
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if (state->mode == REPLAY_GAIN_OFF)
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return;
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float scale = state->info != NULL
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? state->scale : state->missing_preamp;
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pcm_volume(buffer, size, format, pcm_float_to_volume(scale));
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}
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