replay_gain: converted replay_gain_mode to an enum
Prefer C enums over CPP macros.
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		@@ -25,7 +25,7 @@
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#include "audio_format.h"
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					#include "audio_format.h"
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#include "os_compat.h"
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					#include "os_compat.h"
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int replay_gain_mode = REPLAY_GAIN_OFF;
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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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					static float replay_gain_preamp = 1.0;
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@@ -20,13 +20,15 @@
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#ifndef MPD_REPLAY_GAIN_H
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					#ifndef MPD_REPLAY_GAIN_H
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#define MPD_REPLAY_GAIN_H
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					#define MPD_REPLAY_GAIN_H
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#define REPLAY_GAIN_OFF		0
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					enum replay_gain_mode {
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#define REPLAY_GAIN_TRACK	1
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						REPLAY_GAIN_OFF = -1,
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#define REPLAY_GAIN_ALBUM	2
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						REPLAY_GAIN_ALBUM,
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						REPLAY_GAIN_TRACK,
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					};
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struct audio_format;
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					struct audio_format;
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extern int replay_gain_mode;
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					extern enum replay_gain_mode replay_gain_mode;
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struct replay_gain_info {
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					struct replay_gain_info {
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	float album_gain;
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						float album_gain;
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