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Original commit message from CVS: reviewed by: Stefan Kost <ensonic@users.sf.net> * gst/audiofx/Makefile.am: * gst/audiofx/audiofx.c: (plugin_init): * gst/audiofx/audioinvert.c: (gst_audio_invert_base_init), (gst_audio_invert_class_init), (gst_audio_invert_init), (gst_audio_invert_set_property), (gst_audio_invert_get_property), (gst_audio_invert_set_caps), (gst_audio_invert_transform_int), (gst_audio_invert_transform_float), (gst_audio_invert_transform_ip): * gst/audiofx/audioinvert.h: Add new audiofx element "audioinvert". This element swaps the upper and lower half of samples and can be used for example for a wide-stereo effect. Fixes #396057 * docs/plugins/Makefile.am: * docs/plugins/gst-plugins-good-plugins-docs.sgml: * docs/plugins/gst-plugins-good-plugins-sections.txt: * docs/plugins/gst-plugins-good-plugins.args: * docs/plugins/inspect/plugin-audiofx.xml: Add docs for the audioinvert element and add them to the build system. * tests/check/Makefile.am: * tests/check/elements/audioinvert.c: (setup_invert), (cleanup_invert), (GST_START_TEST), (invert_suite), (main): Add unit test suite for the audioinvert element.
278 lines
8.2 KiB
C
278 lines
8.2 KiB
C
/*
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* GStreamer
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* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
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* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
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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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/**
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* SECTION:element-audioinvert
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* @short_description: Swaps upper and lower half of audio samples
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*
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* <refsect2>
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* Swaps upper and lower half of audio samples. Mixing an inverted sample on top of
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* the original with a slight delay can produce effects that sound like resonance.
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* Creating a stereo sample from a mono source, with one channel inverted produces wide-stereo sounds.
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* <title>Example launch line</title>
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* <para>
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* <programlisting>
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* gst-launch audiotestsrc wave=saw ! audioinvert invert=0.4 ! alsasink
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* gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audioinvert invert=0.4 ! alsasink
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* gst-launch audiotestsrc wave=saw ! audioconvert ! audioinvert invert=0.4 ! audioconvert ! alsasink
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* </programlisting>
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* </para>
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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 <gst/base/gstbasetransform.h>
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#include <gst/controller/gstcontroller.h>
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#include "audioinvert.h"
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#define GST_CAT_DEFAULT gst_audio_invert_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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static const GstElementDetails element_details =
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GST_ELEMENT_DETAILS ("AudioInvert",
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"Filter/Effect/Audio",
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"Swaps upper and lower half of audio samples",
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"Sebastian Dröge <slomo@circular-chaos.org>");
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/* Filter 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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PROP_0,
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PROP_DEGREE
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};
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static GstStaticPadTemplate sink_template = 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-float, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX ], "
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"endianness = (int) BYTE_ORDER, " "width = (int) 32; "
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"audio/x-raw-int, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX ], "
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"endianness = (int) BYTE_ORDER, "
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"width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
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);
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static GstStaticPadTemplate src_template = 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-float, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX], "
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"endianness = (int) BYTE_ORDER, " "width = (int) 32; "
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"audio/x-raw-int, "
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"rate = (int) [ 1, MAX ], "
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"channels = (int) [ 1, MAX ], "
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"endianness = (int) BYTE_ORDER, "
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"width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
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);
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#define DEBUG_INIT(bla) \
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GST_DEBUG_CATEGORY_INIT (gst_audio_invert_debug, "audioinvert", 0, "audioinvert element");
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GST_BOILERPLATE_FULL (GstAudioInvert, gst_audio_invert, GstBaseTransform,
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GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
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static void gst_audio_invert_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_audio_invert_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_audio_invert_set_caps (GstBaseTransform * base,
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GstCaps * incaps, GstCaps * outcaps);
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static GstFlowReturn gst_audio_invert_transform_ip (GstBaseTransform * base,
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GstBuffer * buf);
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static void gst_audio_invert_transform_int (GstAudioInvert * filter,
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gint16 * data, guint num_samples);
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static void gst_audio_invert_transform_float (GstAudioInvert * filter,
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gfloat * data, guint num_samples);
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/* GObject vmethod implementations */
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static void
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gst_audio_invert_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_set_details (element_class, &element_details);
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}
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static void
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gst_audio_invert_class_init (GstAudioInvertClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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gobject_class->set_property = gst_audio_invert_set_property;
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gobject_class->get_property = gst_audio_invert_get_property;
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g_object_class_install_property (gobject_class, PROP_DEGREE,
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g_param_spec_float ("degree", "Degree",
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"Degree of inversion", 0.0, 1.0,
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0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
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GST_BASE_TRANSFORM_CLASS (klass)->set_caps =
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GST_DEBUG_FUNCPTR (gst_audio_invert_set_caps);
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GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
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GST_DEBUG_FUNCPTR (gst_audio_invert_transform_ip);
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}
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static void
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gst_audio_invert_init (GstAudioInvert * filter, GstAudioInvertClass * klass)
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{
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filter->degree = 0.0;
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filter->width = 0;
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gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), TRUE);
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}
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static void
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gst_audio_invert_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstAudioInvert *filter = GST_AUDIO_INVERT (object);
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switch (prop_id) {
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case PROP_DEGREE:
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filter->degree = g_value_get_float (value);
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gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (filter),
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filter->degree == 0.0);
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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_audio_invert_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstAudioInvert *filter = GST_AUDIO_INVERT (object);
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switch (prop_id) {
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case PROP_DEGREE:
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g_value_set_float (value, filter->degree);
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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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/* GstBaseTransform vmethod implementations */
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static gboolean
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gst_audio_invert_set_caps (GstBaseTransform * base, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstAudioInvert *filter = GST_AUDIO_INVERT (base);
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const GstStructure *structure;
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gboolean ret;
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gint width;
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const gchar *fmt;
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/*GST_INFO ("incaps are %" GST_PTR_FORMAT, incaps); */
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structure = gst_caps_get_structure (incaps, 0);
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ret = gst_structure_get_int (structure, "width", &width);
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if (!ret)
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goto no_width;
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filter->width = width / 8;
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fmt = gst_structure_get_name (structure);
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if (!strcmp (fmt, "audio/x-raw-int"))
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filter->process = (GstAudioInvertProcessFunc)
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gst_audio_invert_transform_int;
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else
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filter->process = (GstAudioInvertProcessFunc)
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gst_audio_invert_transform_float;
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return TRUE;
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no_width:
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GST_DEBUG ("no width in caps");
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return FALSE;
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}
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static void
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gst_audio_invert_transform_int (GstAudioInvert * filter,
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gint16 * data, guint num_samples)
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{
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gint i;
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gfloat dry = 1.0 - filter->degree;
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glong val;
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for (i = 0; i < num_samples; i++) {
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val = (*data) * dry + (-1 - (*data)) * filter->degree;
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*data++ = (gint16) CLAMP (val, G_MININT16, G_MAXINT16);
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}
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}
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static void
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gst_audio_invert_transform_float (GstAudioInvert * filter,
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gfloat * data, guint num_samples)
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{
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gint i;
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gfloat dry = 1.0 - filter->degree;
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glong val;
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for (i = 0; i < num_samples; i++) {
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val = (*data) * dry - (*data) * filter->degree;
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*data++ = val;
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}
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}
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/* this function does the actual processing
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*/
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static GstFlowReturn
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gst_audio_invert_transform_ip (GstBaseTransform * base, GstBuffer * buf)
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{
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GstAudioInvert *filter = GST_AUDIO_INVERT (base);
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guint num_samples = GST_BUFFER_SIZE (buf) / filter->width;
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if (!gst_buffer_is_writable (buf))
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return GST_FLOW_OK;
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filter->process (filter, GST_BUFFER_DATA (buf), num_samples);
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return GST_FLOW_OK;
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}
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