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Original commit message from CVS: * docs/plugins/Makefile.am: * docs/plugins/gst-plugins-bad-plugins-docs.sgml: * docs/plugins/gst-plugins-bad-plugins-sections.txt: * docs/plugins/gst-plugins-bad-plugins.args: * docs/plugins/gst-plugins-bad-plugins.hierarchy: * docs/plugins/gst-plugins-bad-plugins.interfaces: * docs/plugins/gst-plugins-bad-plugins.prerequisites: * docs/plugins/gst-plugins-bad-plugins.signals: * docs/plugins/inspect/plugin-stereo.xml: * gst/stereo/gststereo.c: Document one more.
236 lines
6.6 KiB
C
236 lines
6.6 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of 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,
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* but 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* This effect is borrowed from xmms-0.6.1, though I mangled it so badly in
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* the process of copying it over that the xmms people probably won't want
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* any credit for it ;-)
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*/
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/**
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* SECTION:element-stereo
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*
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* Create a wide stereo effect.
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*
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* <refsect2>
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* <title>Example pipelines</title>
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* |[
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* gst-launch -v filesrc location=sine.ogg ! oggdemux ! vorbisdec ! audioconvert ! stereo ! audioconvert ! audioresample ! alsasink
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* ]| Play an Ogg/Vorbis 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 "gststereo.h"
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include <gst/audio/audio.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <gst/controller/gstcontroller.h>
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/* elementfactory information */
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static const GstElementDetails stereo_details =
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GST_ELEMENT_DETAILS ("Stereo effect",
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"Filter/Effect/Audio",
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"Muck with the stereo signal to enhance its 'stereo-ness'",
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"Erik Walthinsen <omega@cse.ogi.edu>");
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#define ALLOWED_CAPS \
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"audio/x-raw-int," \
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" depth = (int) 16, " \
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" width = (int) 16, " \
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" endianness = (int) BYTE_ORDER," \
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" rate = (int) [ 1, MAX ]," \
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" channels = (int) 2, " \
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" signed = (boolean) TRUE"
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/* Stereo signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_ACTIVE,
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ARG_STEREO
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};
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static void gst_stereo_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_stereo_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_stereo_transform_ip (GstBaseTransform * base,
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GstBuffer * outbuf);
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/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
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GST_BOILERPLATE (GstStereo, gst_stereo, GstAudioFilter, GST_TYPE_AUDIO_FILTER);
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static void
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gst_stereo_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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GstCaps *caps;
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gst_element_class_set_details (element_class, &stereo_details);
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caps = gst_caps_from_string (ALLOWED_CAPS);
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gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
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caps);
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gst_caps_unref (caps);
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}
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static void
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gst_stereo_class_init (GstStereoClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseTransformClass *trans_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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trans_class = (GstBaseTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_stereo_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_stereo_get_property);
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g_object_class_install_property (gobject_class, ARG_ACTIVE,
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g_param_spec_boolean ("active", "active", "active",
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TRUE, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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g_object_class_install_property (gobject_class, ARG_STEREO,
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g_param_spec_float ("stereo", "stereo", "stereo",
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0.0, 1.0, 0.1, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_stereo_transform_ip);
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}
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static void
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gst_stereo_init (GstStereo * stereo, GstStereoClass * klass)
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{
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stereo->active = TRUE;
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stereo->stereo = 0.1;
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}
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static GstFlowReturn
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gst_stereo_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
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{
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GstStereo *stereo = GST_STEREO (base);
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gint16 *data = (gint16 *) GST_BUFFER_DATA (outbuf);
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gint samples = GST_BUFFER_SIZE (outbuf) / 2;
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gint i;
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gdouble avg, ldiff, rdiff, tmp;
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gdouble mul = stereo->stereo;
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if (!gst_buffer_is_writable (outbuf))
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return GST_FLOW_OK;
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if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (outbuf)))
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gst_object_sync_values (G_OBJECT (stereo), GST_BUFFER_TIMESTAMP (outbuf));
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if (stereo->active) {
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for (i = 0; i < samples / 2; i += 2) {
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avg = (data[i] + data[i + 1]) / 2;
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ldiff = data[i] - avg;
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rdiff = data[i + 1] - avg;
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tmp = avg + ldiff * mul;
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if (tmp < -32768)
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tmp = -32768;
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if (tmp > 32767)
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tmp = 32767;
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data[i] = tmp;
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tmp = avg + rdiff * mul;
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if (tmp < -32768)
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tmp = -32768;
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if (tmp > 32767)
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tmp = 32767;
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data[i + 1] = tmp;
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}
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}
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return GST_FLOW_OK;
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}
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static void
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gst_stereo_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstStereo *stereo;
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g_return_if_fail (GST_IS_STEREO (object));
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stereo = GST_STEREO (object);
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switch (prop_id) {
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case ARG_ACTIVE:
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stereo->active = g_value_get_boolean (value);
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break;
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case ARG_STEREO:
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stereo->stereo = g_value_get_float (value) * 10.0;
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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_stereo_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstStereo *stereo;
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g_return_if_fail (GST_IS_STEREO (object));
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stereo = GST_STEREO (object);
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switch (prop_id) {
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case ARG_ACTIVE:
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g_value_set_boolean (value, stereo->active);
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break;
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case ARG_STEREO:
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g_value_set_float (value, stereo->stereo / 10.0);
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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 gboolean
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plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "stereo", GST_RANK_NONE,
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GST_TYPE_STEREO);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"stereo",
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"Muck with the stereo signal, enhance it's 'stereo-ness'",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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