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-rw-r--r--gst/replaygain/gstrglimiter.c202
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diff --git a/gst/replaygain/gstrglimiter.c b/gst/replaygain/gstrglimiter.c
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--- a/gst/replaygain/gstrglimiter.c
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-/* GStreamer ReplayGain limiter
- *
- * Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
- *
- * gstrglimiter.c: Element to apply signal compression to raw audio data
- *
- * 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-rglimiter
- * @see_also: #GstRgVolume
- *
- * This element applies signal compression/limiting to raw audio data. It
- * performs strict hard limiting with soft-knee characteristics, using a
- * threshold of -6 dB. This type of filter is mentioned in the proposed <ulink
- * url="http://replaygain.org">ReplayGain standard</ulink>.
- *
- * <refsect2>
- * <title>Example launch line</title>
- * |[
- * gst-launch filesrc location=filename.ext ! decodebin ! audioconvert \
- * ! rgvolume pre-amp=6.0 headroom=10.0 ! rglimiter \
- * ! audioconvert ! audioresample ! alsasink
- * ]|Playback of a file
- * </refsect2>
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <gst/gst.h>
-#include <math.h>
-
-#include "gstrglimiter.h"
-
-GST_DEBUG_CATEGORY_STATIC (gst_rg_limiter_debug);
-#define GST_CAT_DEFAULT gst_rg_limiter_debug
-
-enum
-{
- PROP_0,
- PROP_ENABLED,
-};
-
-static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
- GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
- "width = (int) 32, channels = (int) [1, MAX], "
- "rate = (int) [1, MAX], endianness = (int) BYTE_ORDER"));
-
-static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
- GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
- "width = (int) 32, channels = (int) [1, MAX], "
- "rate = (int) [1, MAX], endianness = (int) BYTE_ORDER"));
-
-GST_BOILERPLATE (GstRgLimiter, gst_rg_limiter, GstBaseTransform,
- GST_TYPE_BASE_TRANSFORM);
-
-static void gst_rg_limiter_class_init (GstRgLimiterClass * klass);
-static void gst_rg_limiter_init (GstRgLimiter * filter,
- GstRgLimiterClass * gclass);
-
-static void gst_rg_limiter_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec);
-static void gst_rg_limiter_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec);
-
-static GstFlowReturn gst_rg_limiter_transform_ip (GstBaseTransform * base,
- GstBuffer * buf);
-
-static const GstElementDetails element_details = {
- "ReplayGain limiter",
- "Filter/Effect/Audio",
- "Apply signal compression to raw audio data",
- "Ren\xc3\xa9 Stadler <mail@renestadler.de>"
-};
-
-static void
-gst_rg_limiter_base_init (gpointer g_class)
-{
- GstElementClass *element_class = g_class;
-
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&src_factory));
- gst_element_class_add_pad_template (element_class,
- gst_static_pad_template_get (&sink_factory));
- gst_element_class_set_details (element_class, &element_details);
-
- GST_DEBUG_CATEGORY_INIT (gst_rg_limiter_debug, "rglimiter", 0,
- "ReplayGain limiter element");
-}
-
-static void
-gst_rg_limiter_class_init (GstRgLimiterClass * klass)
-{
- GObjectClass *gobject_class;
- GstBaseTransformClass *trans_class;
-
- gobject_class = (GObjectClass *) klass;
-
- gobject_class->set_property = gst_rg_limiter_set_property;
- gobject_class->get_property = gst_rg_limiter_get_property;
-
- g_object_class_install_property (gobject_class, PROP_ENABLED,
- g_param_spec_boolean ("enabled", "Enabled", "Enable processing", TRUE,
- G_PARAM_READWRITE));
-
- trans_class = GST_BASE_TRANSFORM_CLASS (klass);
- trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_rg_limiter_transform_ip);
- trans_class->passthrough_on_same_caps = FALSE;
-}
-
-static void
-gst_rg_limiter_init (GstRgLimiter * filter, GstRgLimiterClass * gclass)
-{
- GstBaseTransform *base = GST_BASE_TRANSFORM (filter);
-
- gst_base_transform_set_passthrough (base, FALSE);
- gst_base_transform_set_gap_aware (base, TRUE);
-
- filter->enabled = TRUE;
-}
-
-static void
-gst_rg_limiter_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstRgLimiter *filter = GST_RG_LIMITER (object);
-
- switch (prop_id) {
- case PROP_ENABLED:
- filter->enabled = g_value_get_boolean (value);
- gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (filter),
- !filter->enabled);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-gst_rg_limiter_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec)
-{
- GstRgLimiter *filter = GST_RG_LIMITER (object);
-
- switch (prop_id) {
- case PROP_ENABLED:
- g_value_set_boolean (value, filter->enabled);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-#define LIMIT 1.0
-#define THRES 0.5 /* ca. -6 dB */
-#define COMPL 0.5 /* LIMIT - THRESH */
-
-static GstFlowReturn
-gst_rg_limiter_transform_ip (GstBaseTransform * base, GstBuffer * buf)
-{
- GstRgLimiter *filter = GST_RG_LIMITER (base);
- gfloat *input;
- guint count;
- guint i;
-
- if (!filter->enabled)
- return GST_FLOW_OK;
-
- if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_GAP))
- return GST_FLOW_OK;
-
- input = (gfloat *) GST_BUFFER_DATA (buf);
- count = GST_BUFFER_SIZE (buf) / sizeof (gfloat);
-
- for (i = count; i--;) {
- if (*input > THRES)
- *input = tanhf ((*input - THRES) / COMPL) * COMPL + THRES;
- else if (*input < -THRES)
- *input = tanhf ((*input + THRES) / COMPL) * COMPL - THRES;
- input++;
- }
-
- return GST_FLOW_OK;
-}
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