1 /* GStreamer ReplayGain volume adjustment
3 * Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
5 * gstrgvolume.c: Element to apply ReplayGain volume adjustment
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 * SECTION:element-rgvolume
25 * @see_also: #GstRgLimiter, #GstRgAnalysis
27 * This element applies volume changes to streams as lined out in the proposed
28 * <ulink url="http://replaygain.org">ReplayGain standard</ulink>. It
29 * interprets the ReplayGain meta data tags and carries out the adjustment (by
30 * using a volume element internally). The relevant tags are:
32 * <listitem>#GST_TAG_TRACK_GAIN</listitem>
33 * <listitem>#GST_TAG_TRACK_PEAK</listitem>
34 * <listitem>#GST_TAG_ALBUM_GAIN</listitem>
35 * <listitem>#GST_TAG_ALBUM_PEAK</listitem>
36 * <listitem>#GST_TAG_REFERENCE_LEVEL</listitem>
38 * The information carried by these tags must have been calculated beforehand by
39 * performing the ReplayGain analysis. This is implemented by the <link
40 * linkend="GstRgAnalysis">rganalysis</link> element.
42 * The signal compression/limiting recommendations outlined in the proposed
43 * standard are not implemented by this element. This has to be handled by
44 * separate elements because applications might want to have additional filters
45 * between the volume adjustment and the limiting stage. A basic limiter is
46 * included with this plugin: The <link linkend="GstRgLimiter">rglimiter</link>
47 * element applies -6 dB hard limiting as mentioned in the ReplayGain standard.
50 * <title>Example launch line</title>
52 * gst-launch-1.0 filesrc location=filename.ext ! decodebin ! audioconvert \
53 * ! rgvolume ! audioconvert ! audioresample ! alsasink
54 * ]| Playback of a file
63 #include <gst/pbutils/pbutils.h>
64 #include <gst/audio/audio.h>
67 #include "gstrgvolume.h"
68 #include "replaygain.h"
70 GST_DEBUG_CATEGORY_STATIC (gst_rg_volume_debug);
71 #define GST_CAT_DEFAULT gst_rg_volume_debug
84 #define DEFAULT_ALBUM_MODE TRUE
85 #define DEFAULT_HEADROOM 0.0
86 #define DEFAULT_PRE_AMP 0.0
87 #define DEFAULT_FALLBACK_GAIN 0.0
89 #define DB_TO_LINEAR(x) pow (10., (x) / 20.)
90 #define LINEAR_TO_DB(x) (20. * log10 (x))
92 #define GAIN_FORMAT "+.02f dB"
93 #define PEAK_FORMAT ".06f"
95 #define VALID_GAIN(x) ((x) > -60.00 && (x) < 60.00)
96 #define VALID_PEAK(x) ((x) > 0.)
98 /* Same template caps as GstVolume, for I don't like having just ANY caps. */
100 #define FORMAT "{ "GST_AUDIO_NE(F32)","GST_AUDIO_NE(S16)" }"
102 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
105 GST_STATIC_CAPS ("audio/x-raw, "
106 "format = (string) " FORMAT ", "
107 "layout = (string) { interleaved, non-interleaved }, "
108 "rate = (int) [ 1, MAX ], " "channels = (int) [ 1, MAX ]"));
110 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
113 GST_STATIC_CAPS ("audio/x-raw, "
114 "format = (string) " FORMAT ", "
115 "layout = (string) { interleaved, non-interleaved }, "
116 "rate = (int) [ 1, MAX ], " "channels = (int) [ 1, MAX ]"));
118 #define gst_rg_volume_parent_class parent_class
119 G_DEFINE_TYPE (GstRgVolume, gst_rg_volume, GST_TYPE_BIN);
121 static void gst_rg_volume_set_property (GObject * object, guint prop_id,
122 const GValue * value, GParamSpec * pspec);
123 static void gst_rg_volume_get_property (GObject * object, guint prop_id,
124 GValue * value, GParamSpec * pspec);
125 static void gst_rg_volume_dispose (GObject * object);
127 static GstStateChangeReturn gst_rg_volume_change_state (GstElement * element,
128 GstStateChange transition);
129 static gboolean gst_rg_volume_sink_event (GstPad * pad, GstObject * parent,
132 static GstEvent *gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event);
133 static void gst_rg_volume_reset (GstRgVolume * self);
134 static void gst_rg_volume_update_gain (GstRgVolume * self);
135 static inline void gst_rg_volume_determine_gain (GstRgVolume * self,
136 gdouble * target_gain, gdouble * result_gain);
139 gst_rg_volume_class_init (GstRgVolumeClass * klass)
141 GObjectClass *gobject_class;
142 GstElementClass *element_class;
143 GstBinClass *bin_class;
145 gobject_class = (GObjectClass *) klass;
147 gobject_class->set_property = gst_rg_volume_set_property;
148 gobject_class->get_property = gst_rg_volume_get_property;
149 gobject_class->dispose = gst_rg_volume_dispose;
152 * GstRgVolume:album-mode:
154 * Whether to prefer album gain over track gain.
156 * If set to %TRUE, use album gain instead of track gain if both are
157 * available. This keeps the relative loudness levels of tracks from the same
160 * If set to %FALSE, track mode is used instead. This effectively leads to
161 * more extensive normalization.
163 * If album mode is enabled but the album gain tag is absent in the stream,
164 * the track gain is used instead. If both gain tags are missing, the value
165 * of the #GstRgVolume:fallback-gain property is used instead.
167 g_object_class_install_property (gobject_class, PROP_ALBUM_MODE,
168 g_param_spec_boolean ("album-mode", "Album mode",
169 "Prefer album over track gain", DEFAULT_ALBUM_MODE,
170 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
172 * GstRgVolume:headroom:
174 * Extra headroom [dB]. This controls the amount by which the output can
175 * exceed digital full scale.
177 * Only set this to a value greater than 0.0 if signal compression/limiting of
178 * a suitable form is applied to the output (or output is brought into the
179 * correct range by some other transformation).
181 * This element internally uses a volume element, which also supports
182 * operating on integer audio formats. These formats do not allow exceeding
183 * digital full scale. If extra headroom is used, make sure that the raw
184 * audio data format is floating point (F32). Otherwise,
185 * clipping distortion might be introduced as part of the volume adjustment
188 g_object_class_install_property (gobject_class, PROP_HEADROOM,
189 g_param_spec_double ("headroom", "Headroom", "Extra headroom [dB]",
190 0., 60., DEFAULT_HEADROOM,
191 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
193 * GstRgVolume:pre-amp:
195 * Additional gain to apply globally [dB]. This controls the trade-off
196 * between uniformity of normalization and utilization of available dynamic
199 * Note that the default value is 0 dB because the ReplayGain reference value
200 * was adjusted by +6 dB (from 83 to 89 dB). At the time of this writing, the
201 * <ulink url="http://replaygain.org">webpage</ulink> is still outdated and
202 * does not reflect this change however. Where the original proposal states
203 * that a proper default pre-amp value is +6 dB, this translates to the used 0
206 g_object_class_install_property (gobject_class, PROP_PRE_AMP,
207 g_param_spec_double ("pre-amp", "Pre-amp", "Extra gain [dB]",
208 -60., 60., DEFAULT_PRE_AMP,
209 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
211 * GstRgVolume:fallback-gain:
213 * Fallback gain [dB] for streams missing ReplayGain tags.
215 g_object_class_install_property (gobject_class, PROP_FALLBACK_GAIN,
216 g_param_spec_double ("fallback-gain", "Fallback gain",
217 "Gain for streams missing tags [dB]",
218 -60., 60., DEFAULT_FALLBACK_GAIN,
219 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
221 * GstRgVolume:result-gain:
223 * Applied gain [dB]. This gain is applied to processed buffer data.
225 * This is set to the #GstRgVolume:target-gain if amplification by that amount
226 * can be applied safely. "Safely" means that the volume adjustment does not
227 * inflict clipping distortion. Should this not be the case, the result gain
228 * is set to an appropriately reduced value (by applying peak normalization).
229 * The proposed standard calls this "clipping prevention".
231 * The difference between target and result gain reflects the necessary amount
232 * of reduction. Applications can make use of this information to temporarily
233 * reduce the #GstRgVolume:pre-amp for subsequent streams, as recommended by
234 * the ReplayGain standard.
236 * Note that target and result gain differing for a great majority of streams
237 * indicates a problem: What happens in this case is that most streams receive
238 * peak normalization instead of amplification by the ideal replay gain. To
239 * prevent this, the #GstRgVolume:pre-amp has to be lowered and/or a limiter
240 * has to be used which facilitates the use of #GstRgVolume:headroom.
242 g_object_class_install_property (gobject_class, PROP_RESULT_GAIN,
243 g_param_spec_double ("result-gain", "Result-gain", "Applied gain [dB]",
244 -120., 120., 0., G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
246 * GstRgVolume:target-gain:
248 * Applicable gain [dB]. This gain is supposed to be applied.
250 * Depending on the value of the #GstRgVolume:album-mode property and the
251 * presence of ReplayGain tags in the stream, this is set according to one of
252 * these simple formulas:
255 * <listitem>#GstRgVolume:pre-amp + album gain of the stream</listitem>
256 * <listitem>#GstRgVolume:pre-amp + track gain of the stream</listitem>
257 * <listitem>#GstRgVolume:pre-amp + #GstRgVolume:fallback-gain</listitem>
260 g_object_class_install_property (gobject_class, PROP_TARGET_GAIN,
261 g_param_spec_double ("target-gain", "Target-gain",
262 "Applicable gain [dB]", -120., 120., 0.,
263 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
265 element_class = (GstElementClass *) klass;
266 element_class->change_state = GST_DEBUG_FUNCPTR (gst_rg_volume_change_state);
268 bin_class = (GstBinClass *) klass;
269 /* Setting these to NULL makes gst_bin_add and _remove refuse to let anyone
270 * mess with our internals. */
271 bin_class->add_element = NULL;
272 bin_class->remove_element = NULL;
274 gst_element_class_add_static_pad_template (element_class, &src_template);
275 gst_element_class_add_static_pad_template (element_class, &sink_template);
276 gst_element_class_set_static_metadata (element_class, "ReplayGain volume",
277 "Filter/Effect/Audio",
278 "Apply ReplayGain volume adjustment",
279 "Ren\xc3\xa9 Stadler <mail@renestadler.de>");
281 GST_DEBUG_CATEGORY_INIT (gst_rg_volume_debug, "rgvolume", 0,
282 "ReplayGain volume element");
286 gst_rg_volume_init (GstRgVolume * self)
288 GObjectClass *volume_class;
289 GstPad *volume_pad, *ghost_pad;
291 self->album_mode = DEFAULT_ALBUM_MODE;
292 self->headroom = DEFAULT_HEADROOM;
293 self->pre_amp = DEFAULT_PRE_AMP;
294 self->fallback_gain = DEFAULT_FALLBACK_GAIN;
295 self->target_gain = 0.0;
296 self->result_gain = 0.0;
298 self->volume_element = gst_element_factory_make ("volume", "rgvolume-volume");
299 if (G_UNLIKELY (self->volume_element == NULL)) {
302 GST_WARNING_OBJECT (self, "could not create volume element");
303 msg = gst_missing_element_message_new (GST_ELEMENT_CAST (self), "volume");
304 gst_element_post_message (GST_ELEMENT_CAST (self), msg);
306 /* Nothing else to do, we will refuse the state change from NULL to READY to
307 * indicate that something went very wrong. It is doubtful that someone
308 * attempts changing our state though, since we end up having no pads! */
312 volume_class = G_OBJECT_GET_CLASS (G_OBJECT (self->volume_element));
313 self->max_volume = G_PARAM_SPEC_DOUBLE
314 (g_object_class_find_property (volume_class, "volume"))->maximum;
316 GST_BIN_CLASS (parent_class)->add_element (GST_BIN_CAST (self),
317 self->volume_element);
319 volume_pad = gst_element_get_static_pad (self->volume_element, "sink");
320 ghost_pad = gst_ghost_pad_new_from_template ("sink", volume_pad,
321 GST_PAD_PAD_TEMPLATE (volume_pad));
322 gst_object_unref (volume_pad);
323 gst_pad_set_event_function (ghost_pad, gst_rg_volume_sink_event);
324 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
326 volume_pad = gst_element_get_static_pad (self->volume_element, "src");
327 ghost_pad = gst_ghost_pad_new_from_template ("src", volume_pad,
328 GST_PAD_PAD_TEMPLATE (volume_pad));
329 gst_object_unref (volume_pad);
330 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
334 gst_rg_volume_set_property (GObject * object, guint prop_id,
335 const GValue * value, GParamSpec * pspec)
337 GstRgVolume *self = GST_RG_VOLUME (object);
340 case PROP_ALBUM_MODE:
341 self->album_mode = g_value_get_boolean (value);
344 self->headroom = g_value_get_double (value);
347 self->pre_amp = g_value_get_double (value);
349 case PROP_FALLBACK_GAIN:
350 self->fallback_gain = g_value_get_double (value);
353 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
357 gst_rg_volume_update_gain (self);
361 gst_rg_volume_get_property (GObject * object, guint prop_id,
362 GValue * value, GParamSpec * pspec)
364 GstRgVolume *self = GST_RG_VOLUME (object);
367 case PROP_ALBUM_MODE:
368 g_value_set_boolean (value, self->album_mode);
371 g_value_set_double (value, self->headroom);
374 g_value_set_double (value, self->pre_amp);
376 case PROP_FALLBACK_GAIN:
377 g_value_set_double (value, self->fallback_gain);
379 case PROP_TARGET_GAIN:
380 g_value_set_double (value, self->target_gain);
382 case PROP_RESULT_GAIN:
383 g_value_set_double (value, self->result_gain);
386 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
392 gst_rg_volume_dispose (GObject * object)
394 GstRgVolume *self = GST_RG_VOLUME (object);
396 if (self->volume_element != NULL) {
397 /* Manually remove our child using the bin implementation of remove_element.
398 * This is needed because we prevent gst_bin_remove from working, which the
399 * parent dispose handler would use if we had any children left. */
400 GST_BIN_CLASS (parent_class)->remove_element (GST_BIN_CAST (self),
401 self->volume_element);
402 self->volume_element = NULL;
405 G_OBJECT_CLASS (parent_class)->dispose (object);
408 static GstStateChangeReturn
409 gst_rg_volume_change_state (GstElement * element, GstStateChange transition)
411 GstRgVolume *self = GST_RG_VOLUME (element);
412 GstStateChangeReturn res;
414 switch (transition) {
415 case GST_STATE_CHANGE_NULL_TO_READY:
417 if (G_UNLIKELY (self->volume_element == NULL)) {
418 /* Creating our child volume element in _init failed. */
419 return GST_STATE_CHANGE_FAILURE;
423 case GST_STATE_CHANGE_READY_TO_PAUSED:
425 gst_rg_volume_reset (self);
432 res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
437 /* Event function for the ghost sink pad. */
439 gst_rg_volume_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
442 GstEvent *send_event = event;
445 self = GST_RG_VOLUME (parent);
447 switch (GST_EVENT_TYPE (event)) {
450 GST_LOG_OBJECT (self, "received tag event");
452 send_event = gst_rg_volume_tag_event (self, event);
454 if (send_event == NULL)
455 GST_LOG_OBJECT (self, "all tags handled, dropping event");
461 gst_rg_volume_reset (self);
468 if (G_LIKELY (send_event != NULL))
469 res = gst_pad_event_default (pad, parent, send_event);
477 gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event)
479 GstTagList *tag_list;
480 gboolean has_track_gain, has_track_peak, has_album_gain, has_album_peak;
481 gboolean has_ref_level;
483 g_return_val_if_fail (event != NULL, NULL);
484 g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TAG, event);
486 gst_event_parse_tag (event, &tag_list);
488 if (gst_tag_list_is_empty (tag_list))
491 has_track_gain = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_GAIN,
493 has_track_peak = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_PEAK,
495 has_album_gain = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_GAIN,
497 has_album_peak = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_PEAK,
499 has_ref_level = gst_tag_list_get_double (tag_list, GST_TAG_REFERENCE_LEVEL,
500 &self->reference_level);
502 if (!has_track_gain && !has_track_peak && !has_album_gain && !has_album_peak)
505 if (has_ref_level && (has_track_gain || has_album_gain)
506 && (ABS (self->reference_level - RG_REFERENCE_LEVEL) > 1.e-6)) {
507 /* Log a message stating the amount of adjustment that is applied below. */
508 GST_DEBUG_OBJECT (self,
509 "compensating for reference level difference by %" GAIN_FORMAT,
510 RG_REFERENCE_LEVEL - self->reference_level);
512 if (has_track_gain) {
513 self->track_gain += RG_REFERENCE_LEVEL - self->reference_level;
515 if (has_album_gain) {
516 self->album_gain += RG_REFERENCE_LEVEL - self->reference_level;
519 /* Ignore values that are obviously invalid. */
520 if (G_UNLIKELY (has_track_gain && !VALID_GAIN (self->track_gain))) {
521 GST_DEBUG_OBJECT (self,
522 "ignoring bogus track gain value %" GAIN_FORMAT, self->track_gain);
523 has_track_gain = FALSE;
525 if (G_UNLIKELY (has_track_peak && !VALID_PEAK (self->track_peak))) {
526 GST_DEBUG_OBJECT (self,
527 "ignoring bogus track peak value %" PEAK_FORMAT, self->track_peak);
528 has_track_peak = FALSE;
530 if (G_UNLIKELY (has_album_gain && !VALID_GAIN (self->album_gain))) {
531 GST_DEBUG_OBJECT (self,
532 "ignoring bogus album gain value %" GAIN_FORMAT, self->album_gain);
533 has_album_gain = FALSE;
535 if (G_UNLIKELY (has_album_peak && !VALID_PEAK (self->album_peak))) {
536 GST_DEBUG_OBJECT (self,
537 "ignoring bogus album peak value %" PEAK_FORMAT, self->album_peak);
538 has_album_peak = FALSE;
541 /* Clamp peaks >1.0. Float based decoders can produce spurious samples >1.0,
542 * cutting these files back to 1.0 should not cause any audible distortion.
543 * This is most often seen with Vorbis files. */
544 if (has_track_peak && self->track_peak > 1.) {
545 GST_DEBUG_OBJECT (self,
546 "clamping track peak %" PEAK_FORMAT " to 1.0", self->track_peak);
547 self->track_peak = 1.0;
549 if (has_album_peak && self->album_peak > 1.) {
550 GST_DEBUG_OBJECT (self,
551 "clamping album peak %" PEAK_FORMAT " to 1.0", self->album_peak);
552 self->album_peak = 1.0;
555 self->has_track_gain |= has_track_gain;
556 self->has_track_peak |= has_track_peak;
557 self->has_album_gain |= has_album_gain;
558 self->has_album_peak |= has_album_peak;
560 tag_list = gst_tag_list_copy (tag_list);
561 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_GAIN);
562 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_PEAK);
563 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_GAIN);
564 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_PEAK);
565 gst_tag_list_remove_tag (tag_list, GST_TAG_REFERENCE_LEVEL);
567 gst_rg_volume_update_gain (self);
569 gst_event_unref (event);
570 if (gst_tag_list_is_empty (tag_list)) {
571 gst_tag_list_unref (tag_list);
575 return gst_event_new_tag (tag_list);
579 gst_rg_volume_reset (GstRgVolume * self)
581 self->has_track_gain = FALSE;
582 self->has_track_peak = FALSE;
583 self->has_album_gain = FALSE;
584 self->has_album_peak = FALSE;
586 self->reference_level = RG_REFERENCE_LEVEL;
588 gst_rg_volume_update_gain (self);
592 gst_rg_volume_update_gain (GstRgVolume * self)
594 gdouble target_gain, result_gain, result_volume;
595 gboolean target_gain_changed, result_gain_changed;
597 gst_rg_volume_determine_gain (self, &target_gain, &result_gain);
599 result_volume = DB_TO_LINEAR (result_gain);
601 /* Ensure that the result volume is within the range that the volume element
602 * can handle. Currently, the limit is 10. (+20 dB), which should not be
604 if (G_UNLIKELY (result_volume > self->max_volume)) {
605 GST_INFO_OBJECT (self,
606 "cannot handle result gain of %" GAIN_FORMAT " (%0.6f), adjusting",
607 result_gain, result_volume);
609 result_volume = self->max_volume;
610 result_gain = LINEAR_TO_DB (result_volume);
613 /* Direct comparison is OK in this case. */
614 if (target_gain == result_gain) {
615 GST_INFO_OBJECT (self,
616 "result gain is %" GAIN_FORMAT " (%0.6f), matching target",
617 result_gain, result_volume);
619 GST_INFO_OBJECT (self,
620 "result gain is %" GAIN_FORMAT " (%0.6f), target is %" GAIN_FORMAT,
621 result_gain, result_volume, target_gain);
624 target_gain_changed = (self->target_gain != target_gain);
625 result_gain_changed = (self->result_gain != result_gain);
627 self->target_gain = target_gain;
628 self->result_gain = result_gain;
630 g_object_set (self->volume_element, "volume", result_volume, NULL);
632 if (target_gain_changed)
633 g_object_notify ((GObject *) self, "target-gain");
634 if (result_gain_changed)
635 g_object_notify ((GObject *) self, "result-gain");
639 gst_rg_volume_determine_gain (GstRgVolume * self, gdouble * target_gain,
640 gdouble * result_gain)
644 if (!self->has_track_gain && !self->has_album_gain) {
646 GST_DEBUG_OBJECT (self, "using fallback gain");
647 gain = self->fallback_gain;
650 } else if ((self->album_mode && self->has_album_gain)
651 || (!self->album_mode && !self->has_track_gain)) {
653 gain = self->album_gain;
654 if (G_LIKELY (self->has_album_peak)) {
655 peak = self->album_peak;
657 GST_DEBUG_OBJECT (self, "album peak missing, assuming 1.0");
660 /* Falling back from track to album gain shouldn't really happen. */
661 if (G_UNLIKELY (!self->album_mode))
662 GST_INFO_OBJECT (self, "falling back to album gain");
665 /* !album_mode && !has_album_gain || album_mode && has_track_gain */
667 gain = self->track_gain;
668 if (G_LIKELY (self->has_track_peak)) {
669 peak = self->track_peak;
671 GST_DEBUG_OBJECT (self, "track peak missing, assuming 1.0");
674 if (self->album_mode)
675 GST_INFO_OBJECT (self, "falling back to track gain");
678 gain += self->pre_amp;
683 if (LINEAR_TO_DB (peak) + gain > self->headroom) {
684 *result_gain = LINEAR_TO_DB (1. / peak) + self->headroom;