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Diffstat (limited to 'gst/replaygain/gstrgvolume.c')
| -rw-r--r-- | gst/replaygain/gstrgvolume.c | 702 |
1 files changed, 702 insertions, 0 deletions
diff --git a/gst/replaygain/gstrgvolume.c b/gst/replaygain/gstrgvolume.c new file mode 100644 index 00000000..35b4f5ef --- /dev/null +++ b/gst/replaygain/gstrgvolume.c @@ -0,0 +1,702 @@ +/* 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: <link linkend="GstRgLimiter">rglimiter</link>, + * <link linkend="GstRgAnalysis">rganalysis</link> + * + * <refsect2> + * <para> + * 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. + * </para> + * <para> + * 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. + * </para> + * <title>Example launch line</title> + * <para>Playback of a file:</para> + * <programlisting> + * gst-launch filesrc location="Filename.ext" ! decodebin ! audioconvert \ + * ! rgvolume ! audioconvert ! audioresample ! alsasink + * </programlisting> + * </refsect2> + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <gst/gst.h> +#include <gst/pbutils/pbutils.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. */ + +static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, " + "rate = (int) [ 1, MAX ], " + "channels = (int) [ 1, MAX ], " + "endianness = (int) BYTE_ORDER, " + "width = (int) 32; " + "audio/x-raw-int, " + "channels = (int) [ 1, MAX ], " + "rate = (int) [ 1, MAX ], " + "endianness = (int) BYTE_ORDER, " + "width = (int) 16, " "depth = (int) 16, " "signed = (bool) TRUE")); + +static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, " + "rate = (int) [ 1, MAX ], " + "channels = (int) [ 1, MAX ], " + "endianness = (int) BYTE_ORDER, " + "width = (int) 32; " + "audio/x-raw-int, " + "channels = (int) [ 1, MAX ], " + "rate = (int) [ 1, MAX ], " + "endianness = (int) BYTE_ORDER, " + "width = (int) 16, " "depth = (int) 16, " "signed = (bool) TRUE")); + +GST_BOILERPLATE (GstRgVolume, gst_rg_volume, GstBin, GST_TYPE_BIN); + +static void gst_rg_volume_class_init (GstRgVolumeClass * klass); +static void gst_rg_volume_init (GstRgVolume * self, GstRgVolumeClass * gclass); + +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, 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_base_init (gpointer g_class) +{ + GstElementClass *element_class = g_class; + + static const GstElementDetails element_details = { + "ReplayGain volume", + "Filter/Effect/Audio", + "Apply ReplayGain volume adjustment", + "Ren\xc3\xa9 Stadler <mail@renestadler.de>" + }; + + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&src_template)); + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&sink_template)); + gst_element_class_set_details (element_class, &element_details); + + GST_DEBUG_CATEGORY_INIT (gst_rg_volume_debug, "rgvolume", 0, + "ReplayGain volume element"); +} + +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 <link linkend="GstRgVolume--fallback-gain">fallback-gain</link> + * 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)); + /** + * 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 (audio/x-raw-float). 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)); + /** + * 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)); + /** + * 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)); + /** + * GstRgVolume:result-gain: + * + * Applied gain [dB]. This gain is applied to processed buffer data. + * + * This is set to the <link linkend="GstRgVolume--target-gain">target + * gain</link> 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 <link linkend="GstRgVolume--pre-amp">pre-amp</link> 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 <link linkend="GstRgVolume--pre-amp">pre-amp</link> has + * to be lowered and/or a limiter has to be used which facilitates the use of + * <link linkend="GstRgVolume--headroom">headroom</link>. + */ + 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)); + /** + * GstRgVolume:target-gain: + * + * Applicable gain [dB]. This gain is supposed to be applied. + * + * Depending on the value of the <link + * linkend="GstRgVolume--album-mode">album-mode</link> property and the + * presence of ReplayGain tags in the stream, this is set according to one of + * these simple formulas: + * + * <itemizedlist> + * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + album gain + * of the stream</listitem> + * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + track gain + * of the stream</listitem> + * <listitem><link linkend="GstRgVolume--pre-amp">pre-amp</link> + <link + * linkend="GstRgVolume--fallback-gain">fallback gain</link></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)); + + 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; +} + +static void +gst_rg_volume_init (GstRgVolume * self, GstRgVolumeClass * gclass) +{ + 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_pad (self->volume_element, "sink"); + ghost_pad = gst_ghost_pad_new_from_template ("sink", volume_pad, + gst_pad_get_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_pad (self->volume_element, "src"); + ghost_pad = gst_ghost_pad_new_from_template ("src", volume_pad, + gst_pad_get_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, GstEvent * event) +{ + GstRgVolume *self; + GstPad *volume_sink_pad; + GstEvent *send_event = event; + gboolean res; + + self = GST_RG_VOLUME (gst_pad_get_parent_element (pad)); + volume_sink_pad = gst_ghost_pad_get_target (GST_GHOST_PAD (pad)); + + 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_send_event (volume_sink_pad, send_event); + else + res = TRUE; + + gst_object_unref (volume_sink_pad); + gst_object_unref (self); + 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; + } + + 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; + + event = (GstEvent *) gst_mini_object_make_writable (GST_MINI_OBJECT (event)); + gst_event_parse_tag (event, &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); + + if (gst_tag_list_is_empty (tag_list)) { + gst_event_unref (event); + event = NULL; + } + + return event; +} + +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; + } +} |