gstreamer/gst/replaygain/gstrgvolume.c
Tim-Philipp Müller d5d6e6cfdd Revert "BugFix : Change peak value to normalize audio file with fallback gain"
This reverts commit 36e49fd6f8.

Breaks unit test, someone needs to investigate if it's the
patch's fault or if the test needs adjusting/updating.

https://bugzilla.gnome.org/show_bug.cgi?id=673970
2018-05-15 10:35:09 +01:00

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
* @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:
* <itemizedlist>
* <listitem>#GST_TAG_TRACK_GAIN</listitem>
* <listitem>#GST_TAG_TRACK_PEAK</listitem>
* <listitem>#GST_TAG_ALBUM_GAIN</listitem>
* <listitem>#GST_TAG_ALBUM_PEAK</listitem>
* <listitem>#GST_TAG_REFERENCE_LEVEL</listitem>
* </itemizedlist>
* 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.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 filesrc location=filename.ext ! decodebin ! audioconvert \
* ! rgvolume ! audioconvert ! audioresample ! alsasink
* ]| Playback of a file
* </refsect2>
*/
#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:
*
* <itemizedlist>
* <listitem>#GstRgVolume:pre-amp + album gain of the stream</listitem>
* <listitem>#GstRgVolume:pre-amp + track gain of the stream</listitem>
* <listitem>#GstRgVolume:pre-amp + #GstRgVolume:fallback-gain</listitem>
* </itemizedlist>
*/
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;
}
}