[vlc-devel] [PATCH] demux: mpc: fix replaygain calculation (fixes #13176)

[Anatoliy Anischovich]

---
 modules/demux/mpc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/modules/demux/mpc.c b/modules/demux/mpc.c
index a450c11..40a6eae 100644
--- a/modules/demux/mpc.c
+++ b/modules/demux/mpc.c
@@ -195,16 +195,16 @@ static int Open( vlc_object_t * p_this )
     if( p_sys->info.peak_title > 0 )
     {
         fmt.audio_replay_gain.pb_peak[AUDIO_REPLAY_GAIN_TRACK] = true;
-        fmt.audio_replay_gain.pf_peak[AUDIO_REPLAY_GAIN_TRACK] = (float)p_sys->info.peak_title / 32767.0;
+        fmt.audio_replay_gain.pf_peak[AUDIO_REPLAY_GAIN_TRACK] = powf(10, p_sys->info.peak_title / 256.f / 20.f) / 32767.f;
         fmt.audio_replay_gain.pb_gain[AUDIO_REPLAY_GAIN_TRACK] = true;
-        fmt.audio_replay_gain.pf_gain[AUDIO_REPLAY_GAIN_TRACK] = (float)p_sys->info.gain_title / 100.0;
+        fmt.audio_replay_gain.pf_gain[AUDIO_REPLAY_GAIN_TRACK] = MPC_OLD_GAIN_REF - p_sys->info.gain_title / 256.f;
     }
     if( p_sys->info.peak_album > 0 )
     {
         fmt.audio_replay_gain.pb_peak[AUDIO_REPLAY_GAIN_ALBUM] = true;
-        fmt.audio_replay_gain.pf_peak[AUDIO_REPLAY_GAIN_ALBUM] = (float)p_sys->info.peak_album / 32767.0;
+        fmt.audio_replay_gain.pf_peak[AUDIO_REPLAY_GAIN_ALBUM] = powf(10, p_sys->info.peak_title / 256.f / 20.f) / 32767.f;
         fmt.audio_replay_gain.pb_gain[AUDIO_REPLAY_GAIN_ALBUM] = true;
-        fmt.audio_replay_gain.pf_gain[AUDIO_REPLAY_GAIN_ALBUM] = (float)p_sys->info.gain_album / 100.0;
+        fmt.audio_replay_gain.pf_gain[AUDIO_REPLAY_GAIN_ALBUM] = MPC_OLD_GAIN_REF - p_sys->info.gain_album  / 256.f;
     }
 
     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
-- 
1.9.1