mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-23 10:11:08 +00:00
8b1500d7ff
The current limit is `x10`, which allows just `+20 dB` of gain. While it may seem sufficient, this came up as a problem in a real-world, non-specially-engineered situation, in strawberry's EBU R 128 loudness normalization. (https://github.com/strawberrymusicplayer/strawberry/pull/1216) There is an audio track (that was not intentionally engineered that way), that has integrated loudness of `-38 LUFS`, and if we want to normalize it's loudness to e.g. `-16 LUFS`, which is a very reasonable thing to do, we need to apply gain of `+22 dB`, which is larger than `+20 dB`, and we fail... I think it should allow at least `+96 dB` of gain, and therefore should be at `10^(96/20) ~= 63096`. But, i don't see why we need to put any specific restriction on that parameter in the first place, other than the fact that the fixed-point multiplication scheme does not support volume larger than 15x-ish. So let's just implement a floating-point fall-back path that does not involve fixed-point multiplication and lift the restriction altogether? Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5063>
73 lines
2 KiB
C
73 lines
2 KiB
C
/* -*- c-basic-offset: 2 -*-
|
|
* vi:si:et:sw=2:sts=8:ts=8:expandtab
|
|
*
|
|
* GStreamer
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __GST_VOLUME_H__
|
|
#define __GST_VOLUME_H__
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/base/gstbasetransform.h>
|
|
#include <gst/audio/streamvolume.h>
|
|
#include <gst/audio/audio.h>
|
|
#include <gst/audio/gstaudiofilter.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_VOLUME (gst_volume_get_type())
|
|
G_DECLARE_FINAL_TYPE (GstVolume, gst_volume, GST, VOLUME, GstAudioFilter)
|
|
|
|
/**
|
|
* GstVolume:
|
|
*
|
|
* Opaque data structure.
|
|
*/
|
|
struct _GstVolume {
|
|
GstAudioFilter element;
|
|
|
|
void (*process)(GstVolume*, gpointer, guint);
|
|
void (*process_controlled)(GstVolume*, gpointer, gdouble *, guint, guint);
|
|
|
|
gboolean mute;
|
|
gfloat volume;
|
|
|
|
gboolean current_mute;
|
|
gdouble current_volume;
|
|
|
|
gint64 current_vol_i32;
|
|
gint64 current_vol_i24; /* the _i(nt) values get synchronized with the */
|
|
gint64 current_vol_i16; /* the _i(nt) values get synchronized with the */
|
|
gint64 current_vol_i8; /* the _i(nt) values get synchronized with the */
|
|
|
|
GList *tracklist;
|
|
gboolean negotiated;
|
|
|
|
gboolean *mutes;
|
|
guint mutes_count;
|
|
gdouble *volumes;
|
|
guint volumes_count;
|
|
};
|
|
|
|
GST_ELEMENT_REGISTER_DECLARE (volume);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_VOLUME_H__ */
|