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 GST_BOILERPLATE (GstRgVolume, gst_rg_volume, GstBin, GST_TYPE_BIN);
125 static void gst_rg_volume_set_property (GObject * object, guint prop_id,
126 const GValue * value, GParamSpec * pspec);
127 static void gst_rg_volume_get_property (GObject * object, guint prop_id,
128 GValue * value, GParamSpec * pspec);
129 static void gst_rg_volume_dispose (GObject * object);
131 static GstStateChangeReturn gst_rg_volume_change_state (GstElement * element,
132 GstStateChange transition);
133 static gboolean gst_rg_volume_sink_event (GstPad * pad, GstEvent * event);
135 static GstEvent *gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event);
136 static void gst_rg_volume_reset (GstRgVolume * self);
137 static void gst_rg_volume_update_gain (GstRgVolume * self);
138 static inline void gst_rg_volume_determine_gain (GstRgVolume * self,
139 gdouble * target_gain, gdouble * result_gain);
142 gst_rg_volume_base_init (gpointer g_class)
144 GstElementClass *element_class = g_class;
146 gst_element_class_add_pad_template (element_class,
147 gst_static_pad_template_get (&src_template));
148 gst_element_class_add_pad_template (element_class,
149 gst_static_pad_template_get (&sink_template));
150 gst_element_class_set_details_simple (element_class, "ReplayGain volume",
151 "Filter/Effect/Audio",
152 "Apply ReplayGain volume adjustment",
153 "Ren\xc3\xa9 Stadler <mail@renestadler.de>");
155 GST_DEBUG_CATEGORY_INIT (gst_rg_volume_debug, "rgvolume", 0,
156 "ReplayGain volume element");
160 gst_rg_volume_class_init (GstRgVolumeClass * klass)
162 GObjectClass *gobject_class;
163 GstElementClass *element_class;
164 GstBinClass *bin_class;
166 gobject_class = (GObjectClass *) klass;
168 gobject_class->set_property = gst_rg_volume_set_property;
169 gobject_class->get_property = gst_rg_volume_get_property;
170 gobject_class->dispose = gst_rg_volume_dispose;
173 * GstRgVolume:album-mode:
175 * Whether to prefer album gain over track gain.
177 * If set to %TRUE, use album gain instead of track gain if both are
178 * available. This keeps the relative loudness levels of tracks from the same
181 * If set to %FALSE, track mode is used instead. This effectively leads to
182 * more extensive normalization.
184 * If album mode is enabled but the album gain tag is absent in the stream,
185 * the track gain is used instead. If both gain tags are missing, the value
186 * of the <link linkend="GstRgVolume--fallback-gain">fallback-gain</link>
187 * property is used instead.
189 g_object_class_install_property (gobject_class, PROP_ALBUM_MODE,
190 g_param_spec_boolean ("album-mode", "Album mode",
191 "Prefer album over track gain", DEFAULT_ALBUM_MODE,
192 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
194 * GstRgVolume:headroom:
196 * Extra headroom [dB]. This controls the amount by which the output can
197 * exceed digital full scale.
199 * Only set this to a value greater than 0.0 if signal compression/limiting of
200 * a suitable form is applied to the output (or output is brought into the
201 * correct range by some other transformation).
203 * This element internally uses a volume element, which also supports
204 * operating on integer audio formats. These formats do not allow exceeding
205 * digital full scale. If extra headroom is used, make sure that the raw
206 * audio data format is floating point (audio/x-raw-float). Otherwise,
207 * clipping distortion might be introduced as part of the volume adjustment
210 g_object_class_install_property (gobject_class, PROP_HEADROOM,
211 g_param_spec_double ("headroom", "Headroom", "Extra headroom [dB]",
212 0., 60., DEFAULT_HEADROOM,
213 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
215 * GstRgVolume:pre-amp:
217 * Additional gain to apply globally [dB]. This controls the trade-off
218 * between uniformity of normalization and utilization of available dynamic
221 * Note that the default value is 0 dB because the ReplayGain reference value
222 * was adjusted by +6 dB (from 83 to 89 dB). At the time of this writing, the
223 * <ulink url="http://replaygain.org">webpage</ulink> is still outdated and
224 * does not reflect this change however. Where the original proposal states
225 * that a proper default pre-amp value is +6 dB, this translates to the used 0
228 g_object_class_install_property (gobject_class, PROP_PRE_AMP,
229 g_param_spec_double ("pre-amp", "Pre-amp", "Extra gain [dB]",
230 -60., 60., DEFAULT_PRE_AMP,
231 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
233 * GstRgVolume:fallback-gain:
235 * Fallback gain [dB] for streams missing ReplayGain tags.
237 g_object_class_install_property (gobject_class, PROP_FALLBACK_GAIN,
238 g_param_spec_double ("fallback-gain", "Fallback gain",
239 "Gain for streams missing tags [dB]",
240 -60., 60., DEFAULT_FALLBACK_GAIN,
241 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
243 * GstRgVolume:result-gain:
245 * Applied gain [dB]. This gain is applied to processed buffer data.
247 * This is set to the <link linkend="GstRgVolume--target-gain">target
248 * gain</link> if amplification by that amount can be applied safely.
249 * "Safely" means that the volume adjustment does not inflict clipping
250 * distortion. Should this not be the case, the result gain is set to an
251 * appropriately reduced value (by applying peak normalization). The proposed
252 * standard calls this "clipping prevention".
254 * The difference between target and result gain reflects the necessary amount
255 * of reduction. Applications can make use of this information to temporarily
256 * reduce the <link linkend="GstRgVolume--pre-amp">pre-amp</link> for
257 * subsequent streams, as recommended by the ReplayGain standard.
259 * Note that target and result gain differing for a great majority of streams
260 * indicates a problem: What happens in this case is that most streams receive
261 * peak normalization instead of amplification by the ideal replay gain. To
262 * prevent this, the <link linkend="GstRgVolume--pre-amp">pre-amp</link> has
263 * to be lowered and/or a limiter has to be used which facilitates the use of
264 * <link linkend="GstRgVolume--headroom">headroom</link>.
266 g_object_class_install_property (gobject_class, PROP_RESULT_GAIN,
267 g_param_spec_double ("result-gain", "Result-gain", "Applied gain [dB]",
268 -120., 120., 0., G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
270 * GstRgVolume:target-gain:
272 * Applicable gain [dB]. This gain is supposed to be applied.
274 * Depending on the value of the <link
275 * linkend="GstRgVolume--album-mode">album-mode</link> property and the
276 * presence of ReplayGain tags in the stream, this is set according to one of
277 * these simple formulas:
280 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + album gain
281 * of the stream</listitem>
282 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + track gain
283 * of the stream</listitem>
284 * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + <link
285 * linkend="GstRgVolume--fallback-gain">fallback gain</link></listitem>
288 g_object_class_install_property (gobject_class, PROP_TARGET_GAIN,
289 g_param_spec_double ("target-gain", "Target-gain",
290 "Applicable gain [dB]", -120., 120., 0.,
291 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
293 element_class = (GstElementClass *) klass;
294 element_class->change_state = GST_DEBUG_FUNCPTR (gst_rg_volume_change_state);
296 bin_class = (GstBinClass *) klass;
297 /* Setting these to NULL makes gst_bin_add and _remove refuse to let anyone
298 * mess with our internals. */
299 bin_class->add_element = NULL;
300 bin_class->remove_element = NULL;
304 gst_rg_volume_init (GstRgVolume * self, GstRgVolumeClass * gclass)
306 GObjectClass *volume_class;
307 GstPad *volume_pad, *ghost_pad;
309 self->album_mode = DEFAULT_ALBUM_MODE;
310 self->headroom = DEFAULT_HEADROOM;
311 self->pre_amp = DEFAULT_PRE_AMP;
312 self->fallback_gain = DEFAULT_FALLBACK_GAIN;
313 self->target_gain = 0.0;
314 self->result_gain = 0.0;
316 self->volume_element = gst_element_factory_make ("volume", "rgvolume-volume");
317 if (G_UNLIKELY (self->volume_element == NULL)) {
320 GST_WARNING_OBJECT (self, "could not create volume element");
321 msg = gst_missing_element_message_new (GST_ELEMENT_CAST (self), "volume");
322 gst_element_post_message (GST_ELEMENT_CAST (self), msg);
324 /* Nothing else to do, we will refuse the state change from NULL to READY to
325 * indicate that something went very wrong. It is doubtful that someone
326 * attempts changing our state though, since we end up having no pads! */
330 volume_class = G_OBJECT_GET_CLASS (G_OBJECT (self->volume_element));
331 self->max_volume = G_PARAM_SPEC_DOUBLE
332 (g_object_class_find_property (volume_class, "volume"))->maximum;
334 GST_BIN_CLASS (parent_class)->add_element (GST_BIN_CAST (self),
335 self->volume_element);
337 volume_pad = gst_element_get_static_pad (self->volume_element, "sink");
338 ghost_pad = gst_ghost_pad_new_from_template ("sink", volume_pad,
339 gst_pad_get_pad_template (volume_pad));
340 gst_object_unref (volume_pad);
341 gst_pad_set_event_function (ghost_pad, gst_rg_volume_sink_event);
342 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
344 volume_pad = gst_element_get_static_pad (self->volume_element, "src");
345 ghost_pad = gst_ghost_pad_new_from_template ("src", volume_pad,
346 gst_pad_get_pad_template (volume_pad));
347 gst_object_unref (volume_pad);
348 gst_element_add_pad (GST_ELEMENT_CAST (self), ghost_pad);
352 gst_rg_volume_set_property (GObject * object, guint prop_id,
353 const GValue * value, GParamSpec * pspec)
355 GstRgVolume *self = GST_RG_VOLUME (object);
358 case PROP_ALBUM_MODE:
359 self->album_mode = g_value_get_boolean (value);
362 self->headroom = g_value_get_double (value);
365 self->pre_amp = g_value_get_double (value);
367 case PROP_FALLBACK_GAIN:
368 self->fallback_gain = g_value_get_double (value);
371 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
375 gst_rg_volume_update_gain (self);
379 gst_rg_volume_get_property (GObject * object, guint prop_id,
380 GValue * value, GParamSpec * pspec)
382 GstRgVolume *self = GST_RG_VOLUME (object);
385 case PROP_ALBUM_MODE:
386 g_value_set_boolean (value, self->album_mode);
389 g_value_set_double (value, self->headroom);
392 g_value_set_double (value, self->pre_amp);
394 case PROP_FALLBACK_GAIN:
395 g_value_set_double (value, self->fallback_gain);
397 case PROP_TARGET_GAIN:
398 g_value_set_double (value, self->target_gain);
400 case PROP_RESULT_GAIN:
401 g_value_set_double (value, self->result_gain);
404 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
410 gst_rg_volume_dispose (GObject * object)
412 GstRgVolume *self = GST_RG_VOLUME (object);
414 if (self->volume_element != NULL) {
415 /* Manually remove our child using the bin implementation of remove_element.
416 * This is needed because we prevent gst_bin_remove from working, which the
417 * parent dispose handler would use if we had any children left. */
418 GST_BIN_CLASS (parent_class)->remove_element (GST_BIN_CAST (self),
419 self->volume_element);
420 self->volume_element = NULL;
423 G_OBJECT_CLASS (parent_class)->dispose (object);
426 static GstStateChangeReturn
427 gst_rg_volume_change_state (GstElement * element, GstStateChange transition)
429 GstRgVolume *self = GST_RG_VOLUME (element);
430 GstStateChangeReturn res;
432 switch (transition) {
433 case GST_STATE_CHANGE_NULL_TO_READY:
435 if (G_UNLIKELY (self->volume_element == NULL)) {
436 /* Creating our child volume element in _init failed. */
437 return GST_STATE_CHANGE_FAILURE;
441 case GST_STATE_CHANGE_READY_TO_PAUSED:
443 gst_rg_volume_reset (self);
450 res = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
455 /* Event function for the ghost sink pad. */
457 gst_rg_volume_sink_event (GstPad * pad, GstEvent * event)
460 GstPad *volume_sink_pad;
461 GstEvent *send_event = event;
464 self = GST_RG_VOLUME (gst_pad_get_parent_element (pad));
465 volume_sink_pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad));
467 switch (GST_EVENT_TYPE (event)) {
470 GST_LOG_OBJECT (self, "received tag event");
472 send_event = gst_rg_volume_tag_event (self, event);
474 if (send_event == NULL)
475 GST_LOG_OBJECT (self, "all tags handled, dropping event");
481 gst_rg_volume_reset (self);
488 if (G_LIKELY (send_event != NULL))
489 res = gst_pad_send_event (volume_sink_pad, send_event);
493 gst_object_unref (volume_sink_pad);
494 gst_object_unref (self);
499 gst_rg_volume_tag_event (GstRgVolume * self, GstEvent * event)
501 GstTagList *tag_list;
502 gboolean has_track_gain, has_track_peak, has_album_gain, has_album_peak;
503 gboolean has_ref_level;
505 g_return_val_if_fail (event != NULL, NULL);
506 g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_TAG, event);
508 gst_event_parse_tag (event, &tag_list);
510 if (gst_tag_list_is_empty (tag_list))
513 has_track_gain = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_GAIN,
515 has_track_peak = gst_tag_list_get_double (tag_list, GST_TAG_TRACK_PEAK,
517 has_album_gain = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_GAIN,
519 has_album_peak = gst_tag_list_get_double (tag_list, GST_TAG_ALBUM_PEAK,
521 has_ref_level = gst_tag_list_get_double (tag_list, GST_TAG_REFERENCE_LEVEL,
522 &self->reference_level);
524 if (!has_track_gain && !has_track_peak && !has_album_gain && !has_album_peak)
527 if (has_ref_level && (has_track_gain || has_album_gain)
528 && (ABS (self->reference_level - RG_REFERENCE_LEVEL) > 1.e-6)) {
529 /* Log a message stating the amount of adjustment that is applied below. */
530 GST_DEBUG_OBJECT (self,
531 "compensating for reference level difference by %" GAIN_FORMAT,
532 RG_REFERENCE_LEVEL - self->reference_level);
534 if (has_track_gain) {
535 self->track_gain += RG_REFERENCE_LEVEL - self->reference_level;
537 if (has_album_gain) {
538 self->album_gain += RG_REFERENCE_LEVEL - self->reference_level;
541 /* Ignore values that are obviously invalid. */
542 if (G_UNLIKELY (has_track_gain && !VALID_GAIN (self->track_gain))) {
543 GST_DEBUG_OBJECT (self,
544 "ignoring bogus track gain value %" GAIN_FORMAT, self->track_gain);
545 has_track_gain = FALSE;
547 if (G_UNLIKELY (has_track_peak && !VALID_PEAK (self->track_peak))) {
548 GST_DEBUG_OBJECT (self,
549 "ignoring bogus track peak value %" PEAK_FORMAT, self->track_peak);
550 has_track_peak = FALSE;
552 if (G_UNLIKELY (has_album_gain && !VALID_GAIN (self->album_gain))) {
553 GST_DEBUG_OBJECT (self,
554 "ignoring bogus album gain value %" GAIN_FORMAT, self->album_gain);
555 has_album_gain = FALSE;
557 if (G_UNLIKELY (has_album_peak && !VALID_PEAK (self->album_peak))) {
558 GST_DEBUG_OBJECT (self,
559 "ignoring bogus album peak value %" PEAK_FORMAT, self->album_peak);
560 has_album_peak = FALSE;
563 /* Clamp peaks >1.0. Float based decoders can produce spurious samples >1.0,
564 * cutting these files back to 1.0 should not cause any audible distortion.
565 * This is most often seen with Vorbis files. */
566 if (has_track_peak && self->track_peak > 1.) {
567 GST_DEBUG_OBJECT (self,
568 "clamping track peak %" PEAK_FORMAT " to 1.0", self->track_peak);
569 self->track_peak = 1.0;
571 if (has_album_peak && self->album_peak > 1.) {
572 GST_DEBUG_OBJECT (self,
573 "clamping album peak %" PEAK_FORMAT " to 1.0", self->album_peak);
574 self->album_peak = 1.0;
577 self->has_track_gain |= has_track_gain;
578 self->has_track_peak |= has_track_peak;
579 self->has_album_gain |= has_album_gain;
580 self->has_album_peak |= has_album_peak;
582 event = (GstEvent *) gst_mini_object_make_writable (GST_MINI_OBJECT (event));
583 gst_event_parse_tag (event, &tag_list);
585 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_GAIN);
586 gst_tag_list_remove_tag (tag_list, GST_TAG_TRACK_PEAK);
587 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_GAIN);
588 gst_tag_list_remove_tag (tag_list, GST_TAG_ALBUM_PEAK);
589 gst_tag_list_remove_tag (tag_list, GST_TAG_REFERENCE_LEVEL);
591 gst_rg_volume_update_gain (self);
593 if (gst_tag_list_is_empty (tag_list)) {
594 gst_event_unref (event);
602 gst_rg_volume_reset (GstRgVolume * self)
604 self->has_track_gain = FALSE;
605 self->has_track_peak = FALSE;
606 self->has_album_gain = FALSE;
607 self->has_album_peak = FALSE;
609 self->reference_level = RG_REFERENCE_LEVEL;
611 gst_rg_volume_update_gain (self);
615 gst_rg_volume_update_gain (GstRgVolume * self)
617 gdouble target_gain, result_gain, result_volume;
618 gboolean target_gain_changed, result_gain_changed;
620 gst_rg_volume_determine_gain (self, &target_gain, &result_gain);
622 result_volume = DB_TO_LINEAR (result_gain);
624 /* Ensure that the result volume is within the range that the volume element
625 * can handle. Currently, the limit is 10. (+20 dB), which should not be
627 if (G_UNLIKELY (result_volume > self->max_volume)) {
628 GST_INFO_OBJECT (self,
629 "cannot handle result gain of %" GAIN_FORMAT " (%0.6f), adjusting",
630 result_gain, result_volume);
632 result_volume = self->max_volume;
633 result_gain = LINEAR_TO_DB (result_volume);
636 /* Direct comparison is OK in this case. */
637 if (target_gain == result_gain) {
638 GST_INFO_OBJECT (self,
639 "result gain is %" GAIN_FORMAT " (%0.6f), matching target",
640 result_gain, result_volume);
642 GST_INFO_OBJECT (self,
643 "result gain is %" GAIN_FORMAT " (%0.6f), target is %" GAIN_FORMAT,
644 result_gain, result_volume, target_gain);
647 target_gain_changed = (self->target_gain != target_gain);
648 result_gain_changed = (self->result_gain != result_gain);
650 self->target_gain = target_gain;
651 self->result_gain = result_gain;
653 g_object_set (self->volume_element, "volume", result_volume, NULL);
655 if (target_gain_changed)
656 g_object_notify ((GObject *) self, "target-gain");
657 if (result_gain_changed)
658 g_object_notify ((GObject *) self, "result-gain");
662 gst_rg_volume_determine_gain (GstRgVolume * self, gdouble * target_gain,
663 gdouble * result_gain)
667 if (!self->has_track_gain && !self->has_album_gain) {
669 GST_DEBUG_OBJECT (self, "using fallback gain");
670 gain = self->fallback_gain;
673 } else if ((self->album_mode && self->has_album_gain)
674 || (!self->album_mode && !self->has_track_gain)) {
676 gain = self->album_gain;
677 if (G_LIKELY (self->has_album_peak)) {
678 peak = self->album_peak;
680 GST_DEBUG_OBJECT (self, "album peak missing, assuming 1.0");
683 /* Falling back from track to album gain shouldn't really happen. */
684 if (G_UNLIKELY (!self->album_mode))
685 GST_INFO_OBJECT (self, "falling back to album gain");
688 /* !album_mode && !has_album_gain || album_mode && has_track_gain */
690 gain = self->track_gain;
691 if (G_LIKELY (self->has_track_peak)) {
692 peak = self->track_peak;
694 GST_DEBUG_OBJECT (self, "track peak missing, assuming 1.0");
697 if (self->album_mode)
698 GST_INFO_OBJECT (self, "falling back to track gain");
701 gain += self->pre_amp;
706 if (LINEAR_TO_DB (peak) + gain > self->headroom) {
707 *result_gain = LINEAR_TO_DB (1. / peak) + self->headroom;