gstreamer/gst/replaygain/gstrgvolume.c
2019-05-13 10:24:40 -04:00

686 lines
23 KiB
C

/* GStreamer ReplayGain volume adjustment
*
* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
*
* gstrgvolume.c: Element to apply ReplayGain volume adjustment
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
/**
* SECTION:element-rgvolume
* @title: rgvolume
* @see_also: #GstRgLimiter, #GstRgAnalysis
*
* This element applies volume changes to streams as lined out in the proposed
* <ulink url="http://replaygain.org">ReplayGain standard</ulink>. It
* interprets the ReplayGain meta data tags and carries out the adjustment (by
* using a volume element internally). The relevant tags are:
*
* * #GST_TAG_TRACK_GAIN
* * #GST_TAG_TRACK_PEAK
* * #GST_TAG_ALBUM_GAIN
* * #GST_TAG_ALBUM_PEAK
* * #GST_TAG_REFERENCE_LEVEL
*
* The information carried by these tags must have been calculated beforehand by
* performing the ReplayGain analysis. This is implemented by the <link
* linkend="GstRgAnalysis">rganalysis</link> element.
*
* The signal compression/limiting recommendations outlined in the proposed
* standard are not implemented by this element. This has to be handled by
* separate elements because applications might want to have additional filters
* between the volume adjustment and the limiting stage. A basic limiter is
* included with this plugin: The <link linkend="GstRgLimiter">rglimiter</link>
* element applies -6 dB hard limiting as mentioned in the ReplayGain standard.
*
* ## Example launch line
* |[
* gst-launch-1.0 filesrc location=filename.ext ! decodebin ! audioconvert \
* ! rgvolume ! audioconvert ! audioresample ! alsasink
* ]| Playback of a file
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include <gst/audio/audio.h>
#include <math.h>
#include "gstrgvolume.h"
#include "replaygain.h"
GST_DEBUG_CATEGORY_STATIC (gst_rg_volume_debug);
#define GST_CAT_DEFAULT gst_rg_volume_debug
enum
{
PROP_0,
PROP_ALBUM_MODE,
PROP_HEADROOM,
PROP_PRE_AMP,
PROP_FALLBACK_GAIN,
PROP_TARGET_GAIN,
PROP_RESULT_GAIN
};
#define DEFAULT_ALBUM_MODE TRUE
#define DEFAULT_HEADROOM 0.0
#define DEFAULT_PRE_AMP 0.0
#define DEFAULT_FALLBACK_GAIN 0.0
#define DB_TO_LINEAR(x) pow (10., (x) / 20.)
#define LINEAR_TO_DB(x) (20. * log10 (x))
#define GAIN_FORMAT "+.02f dB"
#define PEAK_FORMAT ".06f"
#define VALID_GAIN(x) ((x) > -60.00 && (x) < 60.00)
#define VALID_PEAK(x) ((x) > 0.)
/* Same template caps as GstVolume, for I don't like having just ANY caps. */
#define FORMAT "{ "GST_AUDIO_NE(F32)","GST_AUDIO_NE(S16)" }"
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) " FORMAT ", "
"layout = (string) { interleaved, non-interleaved }, "
"rate = (int) [ 1, MAX ], " "channels = (int) [ 1, MAX ]"));
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) " FORMAT ", "
"layout = (string) { interleaved, non-interleaved }, "
"rate = (int) [ 1, MAX ], " "channels = (int) [ 1, MAX ]"));
#define gst_rg_volume_parent_class parent_class
G_DEFINE_TYPE (GstRgVolume, gst_rg_volume, GST_TYPE_BIN);
static void gst_rg_volume_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rg_volume_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_rg_volume_dispose (GObject * object);
static GstStateChangeReturn gst_rg_volume_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_rg_volume_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstEvent *gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event);
static void gst_rg_volume_reset (GstRgVolume * self);
static void gst_rg_volume_update_gain (GstRgVolume * self);
static inline void gst_rg_volume_determine_gain (GstRgVolume * self,
gdouble * target_gain, gdouble * result_gain);
static void
gst_rg_volume_class_init (GstRgVolumeClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBinClass *bin_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_rg_volume_set_property;
gobject_class->get_property = gst_rg_volume_get_property;
gobject_class->dispose = gst_rg_volume_dispose;
/**
* GstRgVolume:album-mode:
*
* Whether to prefer album gain over track gain.
*
* If set to %TRUE, use album gain instead of track gain if both are
* available. This keeps the relative loudness levels of tracks from the same
* album intact.
*
* If set to %FALSE, track mode is used instead. This effectively leads to
* more extensive normalization.
*
* If album mode is enabled but the album gain tag is absent in the stream,
* the track gain is used instead. If both gain tags are missing, the value
* of the #GstRgVolume:fallback-gain property is used instead.
*/
g_object_class_install_property (gobject_class, PROP_ALBUM_MODE,
g_param_spec_boolean ("album-mode", "Album mode",
"Prefer album over track gain", DEFAULT_ALBUM_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRgVolume:headroom:
*
* Extra headroom [dB]. This controls the amount by which the output can
* exceed digital full scale.
*
* Only set this to a value greater than 0.0 if signal compression/limiting of
* a suitable form is applied to the output (or output is brought into the
* correct range by some other transformation).
*
* This element internally uses a volume element, which also supports
* operating on integer audio formats. These formats do not allow exceeding
* digital full scale. If extra headroom is used, make sure that the raw
* audio data format is floating point (F32). Otherwise,
* clipping distortion might be introduced as part of the volume adjustment
* itself.
*/
g_object_class_install_property (gobject_class, PROP_HEADROOM,
g_param_spec_double ("headroom", "Headroom", "Extra headroom [dB]",
0., 60., DEFAULT_HEADROOM,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRgVolume:pre-amp:
*
* Additional gain to apply globally [dB]. This controls the trade-off
* between uniformity of normalization and utilization of available dynamic
* range.
*
* Note that the default value is 0 dB because the ReplayGain reference value
* was adjusted by +6 dB (from 83 to 89 dB). At the time of this writing, the
* <ulink url="http://replaygain.org">webpage</ulink> is still outdated and
* does not reflect this change however. Where the original proposal states
* that a proper default pre-amp value is +6 dB, this translates to the used 0
* dB.
*/
g_object_class_install_property (gobject_class, PROP_PRE_AMP,
g_param_spec_double ("pre-amp", "Pre-amp", "Extra gain [dB]",
-60., 60., DEFAULT_PRE_AMP,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRgVolume:fallback-gain:
*
* Fallback gain [dB] for streams missing ReplayGain tags.
*/
g_object_class_install_property (gobject_class, PROP_FALLBACK_GAIN,
g_param_spec_double ("fallback-gain", "Fallback gain",
"Gain for streams missing tags [dB]",
-60., 60., DEFAULT_FALLBACK_GAIN,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRgVolume:result-gain:
*
* Applied gain [dB]. This gain is applied to processed buffer data.
*
* This is set to the #GstRgVolume:target-gain if amplification by that amount
* can be applied safely. "Safely" means that the volume adjustment does not
* inflict clipping distortion. Should this not be the case, the result gain
* is set to an appropriately reduced value (by applying peak normalization).
* The proposed standard calls this "clipping prevention".
*
* The difference between target and result gain reflects the necessary amount
* of reduction. Applications can make use of this information to temporarily
* reduce the #GstRgVolume:pre-amp for subsequent streams, as recommended by
* the ReplayGain standard.
*
* Note that target and result gain differing for a great majority of streams
* indicates a problem: What happens in this case is that most streams receive
* peak normalization instead of amplification by the ideal replay gain. To
* prevent this, the #GstRgVolume:pre-amp has to be lowered and/or a limiter
* has to be used which facilitates the use of #GstRgVolume:headroom.
*/
g_object_class_install_property (gobject_class, PROP_RESULT_GAIN,
g_param_spec_double ("result-gain", "Result-gain", "Applied gain [dB]",
-120., 120., 0., G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
/**
* GstRgVolume:target-gain:
*
* Applicable gain [dB]. This gain is supposed to be applied.
*
* Depending on the value of the #GstRgVolume:album-mode property and the
* presence of ReplayGain tags in the stream, this is set according to one of
* these simple formulas:
*
*
* * #GstRgVolume:pre-amp + album gain of the stream
* * #GstRgVolume:pre-amp + track gain of the stream
* * #GstRgVolume:pre-amp + #GstRgVolume:fallback-gain
*
*/
g_object_class_install_property (gobject_class, PROP_TARGET_GAIN,
g_param_spec_double ("target-gain", "Target-gain",
"Applicable gain [dB]", -120., 120., 0.,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
element_class = (GstElementClass *) klass;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_rg_volume_change_state);
bin_class = (GstBinClass *) klass;
/* Setting these to NULL makes gst_bin_add and _remove refuse to let anyone
* mess with our internals. */
bin_class->add_element = NULL;
bin_class->remove_element = NULL;
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_set_static_metadata (element_class, "ReplayGain volume",
"Filter/Effect/Audio",
"Apply ReplayGain volume adjustment",
"Ren\xc3\xa9 Stadler <mail@renestadler.de>");
GST_DEBUG_CATEGORY_INIT (gst_rg_volume_debug, "rgvolume", 0,
"ReplayGain volume element");
}
static void
gst_rg_volume_init (GstRgVolume * self)
{
GObjectClass *volume_class;
GstPad *volume_pad, *ghost_pad;
self->album_mode = DEFAULT_ALBUM_MODE;
self->headroom = DEFAULT_HEADROOM;
self->pre_amp = DEFAULT_PRE_AMP;
self->fallback_gain = DEFAULT_FALLBACK_GAIN;
self->target_gain = 0.0;
self->result_gain = 0.0;
self->volume_element = gst_element_factory_make ("volume", "rgvolume-volume");
if (G_UNLIKELY (self->volume_element == NULL)) {
GstMessage *msg;
GST_WARNING_OBJECT (self, "could not create volume element");
msg = gst_missing_element_message_new (GST_ELEMENT_CAST (self), "volume");
gst_element_post_message (GST_ELEMENT_CAST (self), msg);
/* Nothing else to do, we will refuse the state change from NULL to READY to
* indicate that something went very wrong. It is doubtful that someone
* attempts changing our state though, since we end up having no pads! */
return;
}
volume_class = G_OBJECT_GET_CLASS (G_OBJECT (self->volume_element));
self->max_volume = G_PARAM_SPEC_DOUBLE
(g_object_class_find_property (volume_class, "volume"))->maximum;
GST_BIN_CLASS (parent_class)->add_element (GST_BIN_CAST (self),
self->volume_element);
volume_pad = gst_element_get_static_pad (self->volume_element, "sink");
ghost_pad = gst_ghost_pad_new_from_template ("sink", volume_pad,
GST_PAD_PAD_TEMPLATE (volume_pad));
gst_object_unref (volume_pad);
gst_pad_set_event_function (ghost_pad, gst_rg_volume_sink_event);
gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
volume_pad = gst_element_get_static_pad (self->volume_element, "src");
ghost_pad = gst_ghost_pad_new_from_template ("src", volume_pad,
GST_PAD_PAD_TEMPLATE (volume_pad));
gst_object_unref (volume_pad);
gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
}
static void
gst_rg_volume_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRgVolume *self = GST_RG_VOLUME (object);
switch (prop_id) {
case PROP_ALBUM_MODE:
self->album_mode = g_value_get_boolean (value);
break;
case PROP_HEADROOM:
self->headroom = g_value_get_double (value);
break;
case PROP_PRE_AMP:
self->pre_amp = g_value_get_double (value);
break;
case PROP_FALLBACK_GAIN:
self->fallback_gain = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_rg_volume_update_gain (self);
}
static void
gst_rg_volume_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRgVolume *self = GST_RG_VOLUME (object);
switch (prop_id) {
case PROP_ALBUM_MODE:
g_value_set_boolean (value, self->album_mode);
break;
case PROP_HEADROOM:
g_value_set_double (value, self->headroom);
break;
case PROP_PRE_AMP:
g_value_set_double (value, self->pre_amp);
break;
case PROP_FALLBACK_GAIN:
g_value_set_double (value, self->fallback_gain);
break;
case PROP_TARGET_GAIN:
g_value_set_double (value, self->target_gain);
break;
case PROP_RESULT_GAIN:
g_value_set_double (value, self->result_gain);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rg_volume_dispose (GObject * object)
{
GstRgVolume *self = GST_RG_VOLUME (object);
if (self->volume_element != NULL) {
/* Manually remove our child using the bin implementation of remove_element.
* This is needed because we prevent gst_bin_remove from working, which the
* parent dispose handler would use if we had any children left. */
GST_BIN_CLASS (parent_class)->remove_element (GST_BIN_CAST (self),
self->volume_element);
self->volume_element = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static GstStateChangeReturn
gst_rg_volume_change_state (GstElement * element, GstStateChange transition)
{
GstRgVolume *self = GST_RG_VOLUME (element);
GstStateChangeReturn res;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (G_UNLIKELY (self->volume_element == NULL)) {
/* Creating our child volume element in _init failed. */
return GST_STATE_CHANGE_FAILURE;
}
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rg_volume_reset (self);
break;
default:
break;
}
res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return res;
}
/* Event function for the ghost sink pad. */
static gboolean
gst_rg_volume_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRgVolume *self;
GstEvent *send_event = event;
gboolean res;
self = GST_RG_VOLUME (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_TAG:
GST_LOG_OBJECT (self, "received tag event");
send_event = gst_rg_volume_tag_event (self, event);
if (send_event == NULL)
GST_LOG_OBJECT (self, "all tags handled, dropping event");
break;
case GST_EVENT_EOS:
gst_rg_volume_reset (self);
break;
default:
break;
}
if (G_LIKELY (send_event != NULL))
res = gst_pad_event_default (pad, parent, send_event);
else
res = TRUE;
return res;
}
static GstEvent *
gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event)
{
GstTagList *tag_list;
gboolean has_track_gain, has_track_peak, has_album_gain, has_album_peak;
gboolean has_ref_level;
g_return_val_if_fail (event != NULL, NULL);
g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TAG, event);
gst_event_parse_tag (event, &tag_list);
if (gst_tag_list_is_empty (tag_list))
return event;
has_track_gain = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_GAIN,
&self->track_gain);
has_track_peak = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_PEAK,
&self->track_peak);
has_album_gain = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_GAIN,
&self->album_gain);
has_album_peak = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_PEAK,
&self->album_peak);
has_ref_level = gst_tag_list_get_double (tag_list, GST_TAG_REFERENCE_LEVEL,
&self->reference_level);
if (!has_track_gain && !has_track_peak && !has_album_gain && !has_album_peak)
return event;
if (has_ref_level && (has_track_gain || has_album_gain)
&& (ABS (self->reference_level - RG_REFERENCE_LEVEL) > 1.e-6)) {
/* Log a message stating the amount of adjustment that is applied below. */
GST_DEBUG_OBJECT (self,
"compensating for reference level difference by %" GAIN_FORMAT,
RG_REFERENCE_LEVEL - self->reference_level);
}
if (has_track_gain) {
self->track_gain += RG_REFERENCE_LEVEL - self->reference_level;
}
if (has_album_gain) {
self->album_gain += RG_REFERENCE_LEVEL - self->reference_level;
}
/* Ignore values that are obviously invalid. */
if (G_UNLIKELY (has_track_gain && !VALID_GAIN (self->track_gain))) {
GST_DEBUG_OBJECT (self,
"ignoring bogus track gain value %" GAIN_FORMAT, self->track_gain);
has_track_gain = FALSE;
}
if (G_UNLIKELY (has_track_peak && !VALID_PEAK (self->track_peak))) {
GST_DEBUG_OBJECT (self,
"ignoring bogus track peak value %" PEAK_FORMAT, self->track_peak);
has_track_peak = FALSE;
}
if (G_UNLIKELY (has_album_gain && !VALID_GAIN (self->album_gain))) {
GST_DEBUG_OBJECT (self,
"ignoring bogus album gain value %" GAIN_FORMAT, self->album_gain);
has_album_gain = FALSE;
}
if (G_UNLIKELY (has_album_peak && !VALID_PEAK (self->album_peak))) {
GST_DEBUG_OBJECT (self,
"ignoring bogus album peak value %" PEAK_FORMAT, self->album_peak);
has_album_peak = FALSE;
}
/* Clamp peaks >1.0. Float based decoders can produce spurious samples >1.0,
* cutting these files back to 1.0 should not cause any audible distortion.
* This is most often seen with Vorbis files. */
if (has_track_peak && self->track_peak > 1.) {
GST_DEBUG_OBJECT (self,
"clamping track peak %" PEAK_FORMAT " to 1.0", self->track_peak);
self->track_peak = 1.0;
}
if (has_album_peak && self->album_peak > 1.) {
GST_DEBUG_OBJECT (self,
"clamping album peak %" PEAK_FORMAT " to 1.0", self->album_peak);
self->album_peak = 1.0;
}
self->has_track_gain |= has_track_gain;
self->has_track_peak |= has_track_peak;
self->has_album_gain |= has_album_gain;
self->has_album_peak |= has_album_peak;
tag_list = gst_tag_list_copy (tag_list);
gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_GAIN);
gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_PEAK);
gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_GAIN);
gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_PEAK);
gst_tag_list_remove_tag (tag_list, GST_TAG_REFERENCE_LEVEL);
gst_rg_volume_update_gain (self);
gst_event_unref (event);
if (gst_tag_list_is_empty (tag_list)) {
gst_tag_list_unref (tag_list);
return NULL;
}
return gst_event_new_tag (tag_list);
}
static void
gst_rg_volume_reset (GstRgVolume * self)
{
self->has_track_gain = FALSE;
self->has_track_peak = FALSE;
self->has_album_gain = FALSE;
self->has_album_peak = FALSE;
self->reference_level = RG_REFERENCE_LEVEL;
gst_rg_volume_update_gain (self);
}
static void
gst_rg_volume_update_gain (GstRgVolume * self)
{
gdouble target_gain, result_gain, result_volume;
gboolean target_gain_changed, result_gain_changed;
gst_rg_volume_determine_gain (self, &target_gain, &result_gain);
result_volume = DB_TO_LINEAR (result_gain);
/* Ensure that the result volume is within the range that the volume element
* can handle. Currently, the limit is 10. (+20 dB), which should not be
* restrictive. */
if (G_UNLIKELY (result_volume > self->max_volume)) {
GST_INFO_OBJECT (self,
"cannot handle result gain of %" GAIN_FORMAT " (%0.6f), adjusting",
result_gain, result_volume);
result_volume = self->max_volume;
result_gain = LINEAR_TO_DB (result_volume);
}
/* Direct comparison is OK in this case. */
if (target_gain == result_gain) {
GST_INFO_OBJECT (self,
"result gain is %" GAIN_FORMAT " (%0.6f), matching target",
result_gain, result_volume);
} else {
GST_INFO_OBJECT (self,
"result gain is %" GAIN_FORMAT " (%0.6f), target is %" GAIN_FORMAT,
result_gain, result_volume, target_gain);
}
target_gain_changed = (self->target_gain != target_gain);
result_gain_changed = (self->result_gain != result_gain);
self->target_gain = target_gain;
self->result_gain = result_gain;
g_object_set (self->volume_element, "volume", result_volume, NULL);
if (target_gain_changed)
g_object_notify ((GObject *) self, "target-gain");
if (result_gain_changed)
g_object_notify ((GObject *) self, "result-gain");
}
static inline void
gst_rg_volume_determine_gain (GstRgVolume * self, gdouble * target_gain,
gdouble * result_gain)
{
gdouble gain, peak;
if (!self->has_track_gain && !self->has_album_gain) {
GST_DEBUG_OBJECT (self, "using fallback gain");
gain = self->fallback_gain;
peak = 1.0;
} else if ((self->album_mode && self->has_album_gain)
|| (!self->album_mode && !self->has_track_gain)) {
gain = self->album_gain;
if (G_LIKELY (self->has_album_peak)) {
peak = self->album_peak;
} else {
GST_DEBUG_OBJECT (self, "album peak missing, assuming 1.0");
peak = 1.0;
}
/* Falling back from track to album gain shouldn't really happen. */
if (G_UNLIKELY (!self->album_mode))
GST_INFO_OBJECT (self, "falling back to album gain");
} else {
/* !album_mode && !has_album_gain || album_mode && has_track_gain */
gain = self->track_gain;
if (G_LIKELY (self->has_track_peak)) {
peak = self->track_peak;
} else {
GST_DEBUG_OBJECT (self, "track peak missing, assuming 1.0");
peak = 1.0;
}
if (self->album_mode)
GST_INFO_OBJECT (self, "falling back to track gain");
}
gain += self->pre_amp;
*target_gain = gain;
*result_gain = gain;
if (LINEAR_TO_DB (peak) + gain > self->headroom) {
*result_gain = LINEAR_TO_DB (1. / peak) + self->headroom;
}
}