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 filesrc location=filename.ext ! decodebin ! audioconvert \
53 * ! rgvolume ! audioconvert ! audioresample ! alsasink
54 * ]| Playback of a file
63 #include <gst/pbutils/pbutils.h>
66 #include "gstrgvolume.h"
67 #include "replaygain.h"
69 GST_DEBUG_CATEGORY_STATIC (gst_rg_volume_debug);
70 #define GST_CAT_DEFAULT gst_rg_volume_debug
83 #define DEFAULT_ALBUM_MODE TRUE
84 #define DEFAULT_HEADROOM 0.0
85 #define DEFAULT_PRE_AMP 0.0
86 #define DEFAULT_FALLBACK_GAIN 0.0
88 #define DB_TO_LINEAR(x) pow (10., (x) / 20.)
89 #define LINEAR_TO_DB(x) (20. * log10 (x))
91 #define GAIN_FORMAT "+.02f dB"
92 #define PEAK_FORMAT ".06f"
94 #define VALID_GAIN(x) ((x) > -60.00 && (x) < 60.00)
95 #define VALID_PEAK(x) ((x) > 0.)
97 /* Same template caps as GstVolume, for I don't like having just ANY caps. */
99 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
100 GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
101 "rate = (int) [ 1, MAX ], "
102 "channels = (int) [ 1, MAX ], "
103 "endianness = (int) BYTE_ORDER, "
106 "channels = (int) [ 1, MAX ], "
107 "rate = (int) [ 1, MAX ], "
108 "endianness = (int) BYTE_ORDER, "
109 "width = (int) 16, " "depth = (int) 16, " "signed = (bool) TRUE"));
111 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
112 GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
113 "rate = (int) [ 1, MAX ], "
114 "channels = (int) [ 1, MAX ], "
115 "endianness = (int) BYTE_ORDER, "
118 "channels = (int) [ 1, MAX ], "
119 "rate = (int) [ 1, MAX ], "
120 "endianness = (int) BYTE_ORDER, "
121 "width = (int) 16, " "depth = (int) 16, " "signed = (bool) TRUE"));
123 #define gst_rg_volume_parent_class parent_class
124 G_DEFINE_TYPE (GstRgVolume, gst_rg_volume, GST_TYPE_BIN);
126 static void gst_rg_volume_set_property (GObject * object, guint prop_id,
127 const GValue * value, GParamSpec * pspec);
128 static void gst_rg_volume_get_property (GObject * object, guint prop_id,
129 GValue * value, GParamSpec * pspec);
130 static void gst_rg_volume_dispose (GObject * object);
132 static GstStateChangeReturn gst_rg_volume_change_state (GstElement * element,
133 GstStateChange transition);
134 static gboolean gst_rg_volume_sink_event (GstPad * pad, GstEvent * event);
136 static GstEvent *gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event);
137 static void gst_rg_volume_reset (GstRgVolume * self);
138 static void gst_rg_volume_update_gain (GstRgVolume * self);
139 static inline void gst_rg_volume_determine_gain (GstRgVolume * self,
140 gdouble * target_gain, gdouble * result_gain);
143 gst_rg_volume_class_init (GstRgVolumeClass * klass)
145 GObjectClass *gobject_class;
146 GstElementClass *element_class;
147 GstBinClass *bin_class;
149 gobject_class = (GObjectClass *) klass;
151 gobject_class->set_property = gst_rg_volume_set_property;
152 gobject_class->get_property = gst_rg_volume_get_property;
153 gobject_class->dispose = gst_rg_volume_dispose;
156 * GstRgVolume:album-mode:
158 * Whether to prefer album gain over track gain.
160 * If set to %TRUE, use album gain instead of track gain if both are
161 * available. This keeps the relative loudness levels of tracks from the same
164 * If set to %FALSE, track mode is used instead. This effectively leads to
165 * more extensive normalization.
167 * If album mode is enabled but the album gain tag is absent in the stream,
168 * the track gain is used instead. If both gain tags are missing, the value
169 * of the <link linkend="GstRgVolume--fallback-gain">fallback-gain</link>
170 * property is used instead.
172 g_object_class_install_property (gobject_class, PROP_ALBUM_MODE,
173 g_param_spec_boolean ("album-mode", "Album mode",
174 "Prefer album over track gain", DEFAULT_ALBUM_MODE,
175 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
177 * GstRgVolume:headroom:
179 * Extra headroom [dB]. This controls the amount by which the output can
180 * exceed digital full scale.
182 * Only set this to a value greater than 0.0 if signal compression/limiting of
183 * a suitable form is applied to the output (or output is brought into the
184 * correct range by some other transformation).
186 * This element internally uses a volume element, which also supports
187 * operating on integer audio formats. These formats do not allow exceeding
188 * digital full scale. If extra headroom is used, make sure that the raw
189 * audio data format is floating point (audio/x-raw-float). Otherwise,
190 * clipping distortion might be introduced as part of the volume adjustment
193 g_object_class_install_property (gobject_class, PROP_HEADROOM,
194 g_param_spec_double ("headroom", "Headroom", "Extra headroom [dB]",
195 0., 60., DEFAULT_HEADROOM,
196 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
198 * GstRgVolume:pre-amp:
200 * Additional gain to apply globally [dB]. This controls the trade-off
201 * between uniformity of normalization and utilization of available dynamic
204 * Note that the default value is 0 dB because the ReplayGain reference value
205 * was adjusted by +6 dB (from 83 to 89 dB). At the time of this writing, the
206 * <ulink url="http://replaygain.org">webpage</ulink> is still outdated and
207 * does not reflect this change however. Where the original proposal states
208 * that a proper default pre-amp value is +6 dB, this translates to the used 0
211 g_object_class_install_property (gobject_class, PROP_PRE_AMP,
212 g_param_spec_double ("pre-amp", "Pre-amp", "Extra gain [dB]",
213 -60., 60., DEFAULT_PRE_AMP,
214 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
216 * GstRgVolume:fallback-gain:
218 * Fallback gain [dB] for streams missing ReplayGain tags.
220 g_object_class_install_property (gobject_class, PROP_FALLBACK_GAIN,
221 g_param_spec_double ("fallback-gain", "Fallback gain",
222 "Gain for streams missing tags [dB]",
223 -60., 60., DEFAULT_FALLBACK_GAIN,
224 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
226 * GstRgVolume:result-gain:
228 * Applied gain [dB]. This gain is applied to processed buffer data.
230 * This is set to the <link linkend="GstRgVolume--target-gain">target
231 * gain</link> if amplification by that amount can be applied safely.
232 * "Safely" means that the volume adjustment does not inflict clipping
233 * distortion. Should this not be the case, the result gain is set to an
234 * appropriately reduced value (by applying peak normalization). The proposed
235 * standard calls this "clipping prevention".
237 * The difference between target and result gain reflects the necessary amount
238 * of reduction. Applications can make use of this information to temporarily
239 * reduce the <link linkend="GstRgVolume--pre-amp">pre-amp</link> for
240 * subsequent streams, as recommended by the ReplayGain standard.
242 * Note that target and result gain differing for a great majority of streams
243 * indicates a problem: What happens in this case is that most streams receive
244 * peak normalization instead of amplification by the ideal replay gain. To
245 * prevent this, the <link linkend="GstRgVolume--pre-amp">pre-amp</link> has
246 * to be lowered and/or a limiter has to be used which facilitates the use of
247 * <link linkend="GstRgVolume--headroom">headroom</link>.
249 g_object_class_install_property (gobject_class, PROP_RESULT_GAIN,
250 g_param_spec_double ("result-gain", "Result-gain", "Applied gain [dB]",
251 -120., 120., 0., G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
253 * GstRgVolume:target-gain:
255 * Applicable gain [dB]. This gain is supposed to be applied.
257 * Depending on the value of the <link
258 * linkend="GstRgVolume--album-mode">album-mode</link> property and the
259 * presence of ReplayGain tags in the stream, this is set according to one of
260 * these simple formulas:
263 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + album gain
264 * of the stream</listitem>
265 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + track gain
266 * of the stream</listitem>
267 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + <link
268 * linkend="GstRgVolume--fallback-gain">fallback gain</link></listitem>
271 g_object_class_install_property (gobject_class, PROP_TARGET_GAIN,
272 g_param_spec_double ("target-gain", "Target-gain",
273 "Applicable gain [dB]", -120., 120., 0.,
274 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
276 element_class = (GstElementClass *) klass;
277 element_class->change_state = GST_DEBUG_FUNCPTR (gst_rg_volume_change_state);
279 bin_class = (GstBinClass *) klass;
280 /* Setting these to NULL makes gst_bin_add and _remove refuse to let anyone
281 * mess with our internals. */
282 bin_class->add_element = NULL;
283 bin_class->remove_element = NULL;
285 gst_element_class_add_pad_template (element_class,
286 gst_static_pad_template_get (&src_template));
287 gst_element_class_add_pad_template (element_class,
288 gst_static_pad_template_get (&sink_template));
289 gst_element_class_set_details_simple (element_class, "ReplayGain volume",
290 "Filter/Effect/Audio",
291 "Apply ReplayGain volume adjustment",
292 "Ren\xc3\xa9 Stadler <mail@renestadler.de>");
294 GST_DEBUG_CATEGORY_INIT (gst_rg_volume_debug, "rgvolume", 0,
295 "ReplayGain volume element");
299 gst_rg_volume_init (GstRgVolume * self)
301 GObjectClass *volume_class;
302 GstPad *volume_pad, *ghost_pad;
304 self->album_mode = DEFAULT_ALBUM_MODE;
305 self->headroom = DEFAULT_HEADROOM;
306 self->pre_amp = DEFAULT_PRE_AMP;
307 self->fallback_gain = DEFAULT_FALLBACK_GAIN;
308 self->target_gain = 0.0;
309 self->result_gain = 0.0;
311 self->volume_element = gst_element_factory_make ("volume", "rgvolume-volume");
312 if (G_UNLIKELY (self->volume_element == NULL)) {
315 GST_WARNING_OBJECT (self, "could not create volume element");
316 msg = gst_missing_element_message_new (GST_ELEMENT_CAST (self), "volume");
317 gst_element_post_message (GST_ELEMENT_CAST (self), msg);
319 /* Nothing else to do, we will refuse the state change from NULL to READY to
320 * indicate that something went very wrong. It is doubtful that someone
321 * attempts changing our state though, since we end up having no pads! */
325 volume_class = G_OBJECT_GET_CLASS (G_OBJECT (self->volume_element));
326 self->max_volume = G_PARAM_SPEC_DOUBLE
327 (g_object_class_find_property (volume_class, "volume"))->maximum;
329 GST_BIN_CLASS (parent_class)->add_element (GST_BIN_CAST (self),
330 self->volume_element);
332 volume_pad = gst_element_get_static_pad (self->volume_element, "sink");
333 ghost_pad = gst_ghost_pad_new_from_template ("sink", volume_pad,
334 gst_pad_get_pad_template (volume_pad));
335 gst_object_unref (volume_pad);
336 gst_pad_set_event_function (ghost_pad, gst_rg_volume_sink_event);
337 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
339 volume_pad = gst_element_get_static_pad (self->volume_element, "src");
340 ghost_pad = gst_ghost_pad_new_from_template ("src", volume_pad,
341 gst_pad_get_pad_template (volume_pad));
342 gst_object_unref (volume_pad);
343 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
347 gst_rg_volume_set_property (GObject * object, guint prop_id,
348 const GValue * value, GParamSpec * pspec)
350 GstRgVolume *self = GST_RG_VOLUME (object);
353 case PROP_ALBUM_MODE:
354 self->album_mode = g_value_get_boolean (value);
357 self->headroom = g_value_get_double (value);
360 self->pre_amp = g_value_get_double (value);
362 case PROP_FALLBACK_GAIN:
363 self->fallback_gain = g_value_get_double (value);
366 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
370 gst_rg_volume_update_gain (self);
374 gst_rg_volume_get_property (GObject * object, guint prop_id,
375 GValue * value, GParamSpec * pspec)
377 GstRgVolume *self = GST_RG_VOLUME (object);
380 case PROP_ALBUM_MODE:
381 g_value_set_boolean (value, self->album_mode);
384 g_value_set_double (value, self->headroom);
387 g_value_set_double (value, self->pre_amp);
389 case PROP_FALLBACK_GAIN:
390 g_value_set_double (value, self->fallback_gain);
392 case PROP_TARGET_GAIN:
393 g_value_set_double (value, self->target_gain);
395 case PROP_RESULT_GAIN:
396 g_value_set_double (value, self->result_gain);
399 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
405 gst_rg_volume_dispose (GObject * object)
407 GstRgVolume *self = GST_RG_VOLUME (object);
409 if (self->volume_element != NULL) {
410 /* Manually remove our child using the bin implementation of remove_element.
411 * This is needed because we prevent gst_bin_remove from working, which the
412 * parent dispose handler would use if we had any children left. */
413 GST_BIN_CLASS (parent_class)->remove_element (GST_BIN_CAST (self),
414 self->volume_element);
415 self->volume_element = NULL;
418 G_OBJECT_CLASS (parent_class)->dispose (object);
421 static GstStateChangeReturn
422 gst_rg_volume_change_state (GstElement * element, GstStateChange transition)
424 GstRgVolume *self = GST_RG_VOLUME (element);
425 GstStateChangeReturn res;
427 switch (transition) {
428 case GST_STATE_CHANGE_NULL_TO_READY:
430 if (G_UNLIKELY (self->volume_element == NULL)) {
431 /* Creating our child volume element in _init failed. */
432 return GST_STATE_CHANGE_FAILURE;
436 case GST_STATE_CHANGE_READY_TO_PAUSED:
438 gst_rg_volume_reset (self);
445 res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
450 /* Event function for the ghost sink pad. */
452 gst_rg_volume_sink_event (GstPad * pad, GstEvent * event)
455 GstPad *volume_sink_pad;
456 GstEvent *send_event = event;
459 self = GST_RG_VOLUME (gst_pad_get_parent_element (pad));
460 volume_sink_pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
462 switch (GST_EVENT_TYPE (event)) {
465 GST_LOG_OBJECT (self, "received tag event");
467 send_event = gst_rg_volume_tag_event (self, event);
469 if (send_event == NULL)
470 GST_LOG_OBJECT (self, "all tags handled, dropping event");
476 gst_rg_volume_reset (self);
483 if (G_LIKELY (send_event != NULL))
484 res = gst_pad_send_event (volume_sink_pad, send_event);
488 gst_object_unref (volume_sink_pad);
489 gst_object_unref (self);
494 gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event)
496 GstTagList *tag_list;
497 gboolean has_track_gain, has_track_peak, has_album_gain, has_album_peak;
498 gboolean has_ref_level;
500 g_return_val_if_fail (event != NULL, NULL);
501 g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TAG, event);
503 gst_event_parse_tag (event, &tag_list);
505 if (gst_tag_list_is_empty (tag_list))
508 has_track_gain = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_GAIN,
510 has_track_peak = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_PEAK,
512 has_album_gain = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_GAIN,
514 has_album_peak = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_PEAK,
516 has_ref_level = gst_tag_list_get_double (tag_list, GST_TAG_REFERENCE_LEVEL,
517 &self->reference_level);
519 if (!has_track_gain && !has_track_peak && !has_album_gain && !has_album_peak)
522 if (has_ref_level && (has_track_gain || has_album_gain)
523 && (ABS (self->reference_level - RG_REFERENCE_LEVEL) > 1.e-6)) {
524 /* Log a message stating the amount of adjustment that is applied below. */
525 GST_DEBUG_OBJECT (self,
526 "compensating for reference level difference by %" GAIN_FORMAT,
527 RG_REFERENCE_LEVEL - self->reference_level);
529 if (has_track_gain) {
530 self->track_gain += RG_REFERENCE_LEVEL - self->reference_level;
532 if (has_album_gain) {
533 self->album_gain += RG_REFERENCE_LEVEL - self->reference_level;
536 /* Ignore values that are obviously invalid. */
537 if (G_UNLIKELY (has_track_gain && !VALID_GAIN (self->track_gain))) {
538 GST_DEBUG_OBJECT (self,
539 "ignoring bogus track gain value %" GAIN_FORMAT, self->track_gain);
540 has_track_gain = FALSE;
542 if (G_UNLIKELY (has_track_peak && !VALID_PEAK (self->track_peak))) {
543 GST_DEBUG_OBJECT (self,
544 "ignoring bogus track peak value %" PEAK_FORMAT, self->track_peak);
545 has_track_peak = FALSE;
547 if (G_UNLIKELY (has_album_gain && !VALID_GAIN (self->album_gain))) {
548 GST_DEBUG_OBJECT (self,
549 "ignoring bogus album gain value %" GAIN_FORMAT, self->album_gain);
550 has_album_gain = FALSE;
552 if (G_UNLIKELY (has_album_peak && !VALID_PEAK (self->album_peak))) {
553 GST_DEBUG_OBJECT (self,
554 "ignoring bogus album peak value %" PEAK_FORMAT, self->album_peak);
555 has_album_peak = FALSE;
558 /* Clamp peaks >1.0. Float based decoders can produce spurious samples >1.0,
559 * cutting these files back to 1.0 should not cause any audible distortion.
560 * This is most often seen with Vorbis files. */
561 if (has_track_peak && self->track_peak > 1.) {
562 GST_DEBUG_OBJECT (self,
563 "clamping track peak %" PEAK_FORMAT " to 1.0", self->track_peak);
564 self->track_peak = 1.0;
566 if (has_album_peak && self->album_peak > 1.) {
567 GST_DEBUG_OBJECT (self,
568 "clamping album peak %" PEAK_FORMAT " to 1.0", self->album_peak);
569 self->album_peak = 1.0;
572 self->has_track_gain |= has_track_gain;
573 self->has_track_peak |= has_track_peak;
574 self->has_album_gain |= has_album_gain;
575 self->has_album_peak |= has_album_peak;
577 event = (GstEvent *) gst_mini_object_make_writable (GST_MINI_OBJECT (event));
578 gst_event_parse_tag (event, &tag_list);
580 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_GAIN);
581 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_PEAK);
582 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_GAIN);
583 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_PEAK);
584 gst_tag_list_remove_tag (tag_list, GST_TAG_REFERENCE_LEVEL);
586 gst_rg_volume_update_gain (self);
588 if (gst_tag_list_is_empty (tag_list)) {
589 gst_event_unref (event);
597 gst_rg_volume_reset (GstRgVolume * self)
599 self->has_track_gain = FALSE;
600 self->has_track_peak = FALSE;
601 self->has_album_gain = FALSE;
602 self->has_album_peak = FALSE;
604 self->reference_level = RG_REFERENCE_LEVEL;
606 gst_rg_volume_update_gain (self);
610 gst_rg_volume_update_gain (GstRgVolume * self)
612 gdouble target_gain, result_gain, result_volume;
613 gboolean target_gain_changed, result_gain_changed;
615 gst_rg_volume_determine_gain (self, &target_gain, &result_gain);
617 result_volume = DB_TO_LINEAR (result_gain);
619 /* Ensure that the result volume is within the range that the volume element
620 * can handle. Currently, the limit is 10. (+20 dB), which should not be
622 if (G_UNLIKELY (result_volume > self->max_volume)) {
623 GST_INFO_OBJECT (self,
624 "cannot handle result gain of %" GAIN_FORMAT " (%0.6f), adjusting",
625 result_gain, result_volume);
627 result_volume = self->max_volume;
628 result_gain = LINEAR_TO_DB (result_volume);
631 /* Direct comparison is OK in this case. */
632 if (target_gain == result_gain) {
633 GST_INFO_OBJECT (self,
634 "result gain is %" GAIN_FORMAT " (%0.6f), matching target",
635 result_gain, result_volume);
637 GST_INFO_OBJECT (self,
638 "result gain is %" GAIN_FORMAT " (%0.6f), target is %" GAIN_FORMAT,
639 result_gain, result_volume, target_gain);
642 target_gain_changed = (self->target_gain != target_gain);
643 result_gain_changed = (self->result_gain != result_gain);
645 self->target_gain = target_gain;
646 self->result_gain = result_gain;
648 g_object_set (self->volume_element, "volume", result_volume, NULL);
650 if (target_gain_changed)
651 g_object_notify ((GObject *) self, "target-gain");
652 if (result_gain_changed)
653 g_object_notify ((GObject *) self, "result-gain");
657 gst_rg_volume_determine_gain (GstRgVolume * self, gdouble * target_gain,
658 gdouble * result_gain)
662 if (!self->has_track_gain && !self->has_album_gain) {
664 GST_DEBUG_OBJECT (self, "using fallback gain");
665 gain = self->fallback_gain;
668 } else if ((self->album_mode && self->has_album_gain)
669 || (!self->album_mode && !self->has_track_gain)) {
671 gain = self->album_gain;
672 if (G_LIKELY (self->has_album_peak)) {
673 peak = self->album_peak;
675 GST_DEBUG_OBJECT (self, "album peak missing, assuming 1.0");
678 /* Falling back from track to album gain shouldn't really happen. */
679 if (G_UNLIKELY (!self->album_mode))
680 GST_INFO_OBJECT (self, "falling back to album gain");
683 /* !album_mode && !has_album_gain || album_mode && has_track_gain */
685 gain = self->track_gain;
686 if (G_LIKELY (self->has_track_peak)) {
687 peak = self->track_peak;
689 GST_DEBUG_OBJECT (self, "track peak missing, assuming 1.0");
692 if (self->album_mode)
693 GST_INFO_OBJECT (self, "falling back to track gain");
696 gain += self->pre_amp;
701 if (LINEAR_TO_DB (peak) + gain > self->headroom) {
702 *result_gain = LINEAR_TO_DB (1. / peak) + self->headroom;