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Original commit message from CVS: * gst/replaygain/gstrganalysis.c: * gst/replaygain/gstrglimiter.c: * gst/replaygain/gstrgvolume.c: More doc updates.
202 lines
6.1 KiB
C
202 lines
6.1 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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* @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 <ulink
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* url="http://replaygain.org">ReplayGain standard</ulink>.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch 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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* </refsect2>
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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 "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, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
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"width = (int) 32, channels = (int) [1, MAX], "
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"rate = (int) [1, MAX], endianness = (int) BYTE_ORDER"));
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-float, "
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"width = (int) 32, channels = (int) [1, MAX], "
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"rate = (int) [1, MAX], endianness = (int) BYTE_ORDER"));
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GST_BOILERPLATE (GstRgLimiter, gst_rg_limiter, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM);
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static void gst_rg_limiter_class_init (GstRgLimiterClass * klass);
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static void gst_rg_limiter_init (GstRgLimiter * filter,
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GstRgLimiterClass * gclass);
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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 const GstElementDetails element_details = {
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"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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};
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static void
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gst_rg_limiter_base_init (gpointer g_class)
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{
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GstElementClass *element_class = g_class;
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_factory));
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gst_element_class_set_details (element_class, &element_details);
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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_class_init (GstRgLimiterClass * klass)
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{
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GObjectClass *gobject_class;
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GstBaseTransformClass *trans_class;
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gobject_class = (GObjectClass *) 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));
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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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}
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static void
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gst_rg_limiter_init (GstRgLimiter * filter, GstRgLimiterClass * gclass)
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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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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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input = (gfloat *) GST_BUFFER_DATA (buf);
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count = GST_BUFFER_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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return GST_FLOW_OK;
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}
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