replay_gain: reimplement as a filter plugin

Apply the replay gain in the output thread.  This means a new setting
will be active instantly, without going through the whole music pipe.
And we might have different replay gain settings for each audio output
device.

1 files changed, 0 insertions, 117 deletions

diff --git a/src/replay_gain_state.c b/src/replay_gain_state.c
deleted file mode 100644
index cfb2ce120..000000000
--- a/src/replay_gain_state.c
+++ /dev/null
@@ -1,117 +0,0 @@
-/*
- * 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>
-
-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;
-	replay_gain_info_init(&state->info);
-
-	return state;
-}
-
-void
-replay_gain_state_free(struct replay_gain_state *state)
-{
-	assert(state != NULL);
-
-	g_free(state);
-}
-
-static void
-replay_gain_state_calc_scale(struct replay_gain_state *state)
-{
-	assert(state != NULL);
-
-	if (state->mode == REPLAY_GAIN_OFF)
-		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 = replay_gain_tuple_scale(tuple, 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 (info != NULL)
-		state->info = *info;
-	else
-		replay_gain_info_init(&state->info);
-
-	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));
-}