--- a/gst_plugins_good/gst/audiofx/audiokaraoke.c Fri Jul 09 16:26:45 2010 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,357 +0,0 @@
-/*
- * GStreamer
- * Copyright (C) 2008 Wim Taymans <wim.taymans@gmail.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-/**
- * SECTION:element-audiokaraoke
- *
- * Remove the voice from audio by filtering the center channel.
- * This plugin is useful for karaoke applications.
- *
- * <refsect2>
- * <title>Example launch line</title>
- * |[
- * gst-launch filesrc location=song.ogg ! oggdemux ! vorbisdec ! audiokaraoke ! audioconvert ! alsasink
- * ]|
- * </refsect2>
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <math.h>
-
-#include <gst/gst.h>
-#include <gst/base/gstbasetransform.h>
-#include <gst/audio/audio.h>
-#include <gst/audio/gstaudiofilter.h>
-#include <gst/controller/gstcontroller.h>
-
-#include "audiokaraoke.h"
-
-#define GST_CAT_DEFAULT gst_audio_karaoke_debug
-GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
-
-static const GstElementDetails element_details =
-GST_ELEMENT_DETAILS ("AudioKaraoke",
- "Filter/Effect/Audio",
- "Removes voice from sound",
- "Wim Taymans <wim.taymans@gmail.com>");
-
-/* Filter signals and args */
-enum
-{
- /* FILL ME */
- LAST_SIGNAL
-};
-
-#define DEFAULT_LEVEL 1.0
-#define DEFAULT_MONO_LEVEL 1.0
-#define DEFAULT_FILTER_BAND 220.0
-#define DEFAULT_FILTER_WIDTH 100.0
-
-enum
-{
- PROP_0,
- PROP_LEVEL,
- PROP_MONO_LEVEL,
- PROP_FILTER_BAND,
- PROP_FILTER_WIDTH,
- PROP_LAST
-};
-
-#define ALLOWED_CAPS \
- "audio/x-raw-int," \
- " depth=(int)16," \
- " width=(int)16," \
- " endianness=(int)BYTE_ORDER," \
- " signed=(bool)TRUE," \
- " rate=(int)[1,MAX]," \
- " channels=(int)[1,MAX]; " \
- "audio/x-raw-float," \
- " width=(int)32," \
- " endianness=(int)BYTE_ORDER," \
- " rate=(int)[1,MAX]," \
- " channels=(int)[1,MAX]"
-
-#define DEBUG_INIT(bla) \
- GST_DEBUG_CATEGORY_INIT (gst_audio_karaoke_debug, "audiokaraoke", 0, "audiokaraoke element");
-
-GST_BOILERPLATE_FULL (GstAudioKaraoke, gst_audio_karaoke, GstAudioFilter,
- GST_TYPE_AUDIO_FILTER, DEBUG_INIT);
-
-static void gst_audio_karaoke_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec);
-static void gst_audio_karaoke_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec);
-
-static gboolean gst_audio_karaoke_setup (GstAudioFilter * filter,
- GstRingBufferSpec * format);
-static GstFlowReturn gst_audio_karaoke_transform_ip (GstBaseTransform * base,
- GstBuffer * buf);
-
-static void gst_audio_karaoke_transform_int (GstAudioKaraoke * filter,
- gint16 * data, guint num_samples);
-static void gst_audio_karaoke_transform_float (GstAudioKaraoke * filter,
- gfloat * data, guint num_samples);
-
-/* GObject vmethod implementations */
-
-static void
-gst_audio_karaoke_base_init (gpointer klass)
-{
- GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
- GstCaps *caps;
-
- gst_element_class_set_details (element_class, &element_details);
-
- caps = gst_caps_from_string (ALLOWED_CAPS);
- gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (klass),
- caps);
- gst_caps_unref (caps);
-}
-
-static void
-gst_audio_karaoke_class_init (GstAudioKaraokeClass * klass)
-{
- GObjectClass *gobject_class;
-
- gobject_class = (GObjectClass *) klass;
- gobject_class->set_property = gst_audio_karaoke_set_property;
- gobject_class->get_property = gst_audio_karaoke_get_property;
-
- g_object_class_install_property (gobject_class, PROP_LEVEL,
- g_param_spec_float ("level", "Level",
- "Level of the effect (1.0 = full)", 0.0, 1.0, DEFAULT_LEVEL,
- G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
-
- g_object_class_install_property (gobject_class, PROP_MONO_LEVEL,
- g_param_spec_float ("mono-level", "Mono Level",
- "Level of the mono channel (1.0 = full)", 0.0, 1.0, DEFAULT_LEVEL,
- G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
-
- g_object_class_install_property (gobject_class, PROP_FILTER_BAND,
- g_param_spec_float ("filter-band", "Filter Band",
- "The Frequency band of the filter", 0.0, 441.0, DEFAULT_FILTER_BAND,
- G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
-
- g_object_class_install_property (gobject_class, PROP_FILTER_WIDTH,
- g_param_spec_float ("filter-width", "Filter Width",
- "The Frequency width of the filter", 0.0, 100.0, DEFAULT_FILTER_WIDTH,
- G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
-
- GST_AUDIO_FILTER_CLASS (klass)->setup =
- GST_DEBUG_FUNCPTR (gst_audio_karaoke_setup);
- GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
- GST_DEBUG_FUNCPTR (gst_audio_karaoke_transform_ip);
-}
-
-static void
-gst_audio_karaoke_init (GstAudioKaraoke * filter, GstAudioKaraokeClass * klass)
-{
- gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), TRUE);
- gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (filter), TRUE);
-
- filter->level = DEFAULT_LEVEL;
- filter->mono_level = DEFAULT_MONO_LEVEL;
- filter->filter_band = DEFAULT_FILTER_BAND;
- filter->filter_width = DEFAULT_FILTER_WIDTH;
-}
-
-static void
-update_filter (GstAudioKaraoke * filter, gint rate)
-{
- gfloat A, B, C;
-
- if (rate == 0)
- return;
-
- C = exp (-2 * M_PI * filter->filter_width / rate);
- B = -4 * C / (1 + C) * cos (2 * M_PI * filter->filter_band / rate);
- A = sqrt (1 - B * B / (4 * C)) * (1 - C);
-
- filter->A = A;
- filter->B = B;
- filter->C = C;
- filter->y1 = 0.0;
- filter->y2 = 0.0;
-}
-
-static void
-gst_audio_karaoke_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstAudioKaraoke *filter;
-
- filter = GST_AUDIO_KARAOKE (object);
-
- switch (prop_id) {
- case PROP_LEVEL:
- filter->level = g_value_get_float (value);
- break;
- case PROP_MONO_LEVEL:
- filter->mono_level = g_value_get_float (value);
- break;
- case PROP_FILTER_BAND:
- filter->filter_band = g_value_get_float (value);
- update_filter (filter, filter->rate);
- break;
- case PROP_FILTER_WIDTH:
- filter->filter_width = g_value_get_float (value);
- update_filter (filter, filter->rate);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static void
-gst_audio_karaoke_get_property (GObject * object, guint prop_id,
- GValue * value, GParamSpec * pspec)
-{
- GstAudioKaraoke *filter;
-
- filter = GST_AUDIO_KARAOKE (object);
-
- switch (prop_id) {
- case PROP_LEVEL:
- g_value_set_float (value, filter->level);
- break;
- case PROP_MONO_LEVEL:
- g_value_set_float (value, filter->mono_level);
- break;
- case PROP_FILTER_BAND:
- g_value_set_float (value, filter->filter_band);
- break;
- case PROP_FILTER_WIDTH:
- g_value_set_float (value, filter->filter_width);
- break;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-/* GstAudioFilter vmethod implementations */
-
-static gboolean
-gst_audio_karaoke_setup (GstAudioFilter * base, GstRingBufferSpec * format)
-{
- GstAudioKaraoke *filter = GST_AUDIO_KARAOKE (base);
- gboolean ret = TRUE;
-
- filter->channels = format->channels;
- filter->rate = format->rate;
-
- if (format->type == GST_BUFTYPE_FLOAT && format->width == 32)
- filter->process = (GstAudioKaraokeProcessFunc)
- gst_audio_karaoke_transform_float;
- else if (format->type == GST_BUFTYPE_LINEAR && format->width == 16)
- filter->process = (GstAudioKaraokeProcessFunc)
- gst_audio_karaoke_transform_int;
- else
- ret = FALSE;
-
- update_filter (filter, format->rate);
-
- return ret;
-}
-
-static void
-gst_audio_karaoke_transform_int (GstAudioKaraoke * filter,
- gint16 * data, guint num_samples)
-{
- gint i, l, r, o, x;
- gint channels;
- gdouble y;
- gint level;
-
- channels = filter->channels;
- level = filter->level * 256;
-
- for (i = 0; i < num_samples; i += channels) {
- /* get left and right inputs */
- l = data[i];
- r = data[i + 1];
- /* do filtering */
- x = (l + r) / 2;
- y = (filter->A * x - filter->B * filter->y1) - filter->C * filter->y2;
- filter->y2 = filter->y1;
- filter->y1 = y;
- /* filter mono signal */
- o = (int) (y * filter->mono_level);
- o = CLAMP (o, G_MININT16, G_MAXINT16);
- o = (o * level) >> 8;
- /* now cut the center */
- x = l - ((r * level) >> 8) + o;
- r = r - ((l * level) >> 8) + o;
- data[i] = CLAMP (x, G_MININT16, G_MAXINT16);
- data[i + 1] = CLAMP (r, G_MININT16, G_MAXINT16);
- }
-}
-
-static void
-gst_audio_karaoke_transform_float (GstAudioKaraoke * filter,
- gfloat * data, guint num_samples)
-{
- gint i;
- gint channels;
- gdouble l, r, o;
- gdouble y;
-
- channels = filter->channels;
-
- for (i = 0; i < num_samples; i += channels) {
- /* get left and right inputs */
- l = data[i];
- r = data[i + 1];
- /* do filtering */
- y = (filter->A * ((l + r) / 2.0) - filter->B * filter->y1) -
- filter->C * filter->y2;
- filter->y2 = filter->y1;
- filter->y1 = y;
- /* filter mono signal */
- o = y * filter->mono_level * filter->level;
- /* now cut the center */
- data[i] = l - (r * filter->level) + o;
- data[i + 1] = r - (l * filter->level) + o;
- }
-}
-
-/* GstBaseTransform vmethod implementations */
-static GstFlowReturn
-gst_audio_karaoke_transform_ip (GstBaseTransform * base, GstBuffer * buf)
-{
- GstAudioKaraoke *filter = GST_AUDIO_KARAOKE (base);
- guint num_samples =
- GST_BUFFER_SIZE (buf) / (GST_AUDIO_FILTER (filter)->format.width / 8);
-
- if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buf)))
- gst_object_sync_values (G_OBJECT (filter), GST_BUFFER_TIMESTAMP (buf));
-
- if (gst_base_transform_is_passthrough (base) ||
- G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_GAP)))
- return GST_FLOW_OK;
-
- filter->process (filter, GST_BUFFER_DATA (buf), num_samples);
-
- return GST_FLOW_OK;
-}