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199 lines
6 KiB
C
199 lines
6 KiB
C
/* GStreamer ReplayGain limiter
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*
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* Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
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*
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* gstrglimiter.c: Element to apply signal compression to raw audio data
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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/**
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* SECTION:element-rglimiter
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* @title: rglimiter
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* @see_also: #GstRgVolume
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*
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* This element applies signal compression/limiting to raw audio data. It
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* performs strict hard limiting with soft-knee characteristics, using a
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* threshold of -6 dB. This type of filter is mentioned in the proposed
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* [ReplayGain standard](https://wiki.hydrogenaud.io/index.php?title=ReplayGain).
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 filesrc location=filename.ext ! decodebin ! audioconvert \
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* ! rgvolume pre-amp=6.0 headroom=10.0 ! rglimiter \
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* ! audioconvert ! audioresample ! alsasink
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* ]|Playback of a file
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <gst/gst.h>
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#include <math.h>
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#include <gst/audio/audio.h>
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#include "gstrglimiter.h"
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GST_DEBUG_CATEGORY_STATIC (gst_rg_limiter_debug);
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#define GST_CAT_DEFAULT gst_rg_limiter_debug
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enum
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{
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PROP_0,
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PROP_ENABLED,
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};
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static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, "
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"format = (string) " GST_AUDIO_NE (F32) ", "
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"layout = (string) { interleaved, non-interleaved }, "
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"channels = (int) [1, MAX], " "rate = (int) [1, MAX]"));
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, "
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"format = (string) " GST_AUDIO_NE (F32) ", "
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"layout = (string) { interleaved, non-interleaved}, "
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"channels = (int) [1, MAX], " "rate = (int) [1, MAX]"));
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#define gst_rg_limiter_parent_class parent_class
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G_DEFINE_TYPE (GstRgLimiter, gst_rg_limiter, GST_TYPE_BASE_TRANSFORM);
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static void gst_rg_limiter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rg_limiter_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_rg_limiter_transform_ip (GstBaseTransform * base,
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GstBuffer * buf);
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static void
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gst_rg_limiter_class_init (GstRgLimiterClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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GstBaseTransformClass *trans_class;
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gobject_class = (GObjectClass *) klass;
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element_class = (GstElementClass *) klass;
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gobject_class->set_property = gst_rg_limiter_set_property;
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gobject_class->get_property = gst_rg_limiter_get_property;
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g_object_class_install_property (gobject_class, PROP_ENABLED,
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g_param_spec_boolean ("enabled", "Enabled", "Enable processing", TRUE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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trans_class = GST_BASE_TRANSFORM_CLASS (klass);
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_rg_limiter_transform_ip);
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trans_class->passthrough_on_same_caps = FALSE;
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gst_element_class_add_static_pad_template (element_class, &src_factory);
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gst_element_class_add_static_pad_template (element_class, &sink_factory);
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gst_element_class_set_static_metadata (element_class, "ReplayGain limiter",
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"Filter/Effect/Audio",
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"Apply signal compression to raw audio data",
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"Ren\xc3\xa9 Stadler <mail@renestadler.de>");
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GST_DEBUG_CATEGORY_INIT (gst_rg_limiter_debug, "rglimiter", 0,
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"ReplayGain limiter element");
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}
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static void
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gst_rg_limiter_init (GstRgLimiter * filter)
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{
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GstBaseTransform *base = GST_BASE_TRANSFORM (filter);
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gst_base_transform_set_passthrough (base, FALSE);
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gst_base_transform_set_gap_aware (base, TRUE);
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filter->enabled = TRUE;
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}
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static void
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gst_rg_limiter_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRgLimiter *filter = GST_RG_LIMITER (object);
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switch (prop_id) {
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case PROP_ENABLED:
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filter->enabled = g_value_get_boolean (value);
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gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (filter),
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!filter->enabled);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rg_limiter_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRgLimiter *filter = GST_RG_LIMITER (object);
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switch (prop_id) {
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case PROP_ENABLED:
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g_value_set_boolean (value, filter->enabled);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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#define LIMIT 1.0
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#define THRES 0.5 /* ca. -6 dB */
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#define COMPL 0.5 /* LIMIT - THRESH */
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static GstFlowReturn
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gst_rg_limiter_transform_ip (GstBaseTransform * base, GstBuffer * buf)
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{
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GstRgLimiter *filter = GST_RG_LIMITER (base);
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gfloat *input;
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GstMapInfo map;
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guint count;
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guint i;
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if (!filter->enabled)
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return GST_FLOW_OK;
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if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_GAP))
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return GST_FLOW_OK;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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input = (gfloat *) map.data;
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count = gst_buffer_get_size (buf) / sizeof (gfloat);
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for (i = count; i--;) {
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if (*input > THRES)
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*input = tanhf ((*input - THRES) / COMPL) * COMPL + THRES;
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else if (*input < -THRES)
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*input = tanhf ((*input + THRES) / COMPL) * COMPL - THRES;
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input++;
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}
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gst_buffer_unmap (buf, &map);
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return GST_FLOW_OK;
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}
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