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author | David Schleef <ds@schleef.org> | 2013-05-18 13:57:11 -0700 |
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committer | David Schleef <ds@schleef.org> | 2013-05-18 14:02:18 -0700 |
commit | 35018ae6323645833bdd2ba604a7eb1954d12aa3 (patch) | |
tree | 5115da0bcdb798e04de79cf059674ac83cc2e5db /gst/audiofxbad/gstaudiochannelmix.c | |
parent | 127fcf05a7a5ae3075fc9b7d953f4416e3e64d57 (diff) | |
download | gstreamer-plugins-bad-35018ae6323645833bdd2ba604a7eb1954d12aa3.tar.gz |
audiofx: Add plugin, add audiochannelmix
Diffstat (limited to 'gst/audiofxbad/gstaudiochannelmix.c')
-rw-r--r-- | gst/audiofxbad/gstaudiochannelmix.c | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/gst/audiofxbad/gstaudiochannelmix.c b/gst/audiofxbad/gstaudiochannelmix.c new file mode 100644 index 000000000..4494d52b8 --- /dev/null +++ b/gst/audiofxbad/gstaudiochannelmix.c @@ -0,0 +1,276 @@ +/* GStreamer + * Copyright (C) 2013 David Schleef <ds@schleef.org> + * + * 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., 51 Franklin Street, Suite 500, + * Boston, MA 02110-1335, USA. + */ +/** + * SECTION:element-gstaudiochannelmix + * + * The audiochannelmix element mixes channels in stereo audio based on + * properties set on the element. The primary purpose is reconstruct + * equal left/right channels on an input stream that has audio in only + * one channel. + * + * <refsect2> + * <title>Example launch line</title> + * |[ + * gst-launch -v audiotestsrc ! audiochannelmix ! autoaudiosink + * ]| + * </refsect2> + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gst/gst.h> +#include <gst/audio/gstaudiofilter.h> +#include "gstaudiochannelmix.h" +#include <math.h> + +GST_DEBUG_CATEGORY_STATIC (gst_audio_channel_mix_debug_category); +#define GST_CAT_DEFAULT gst_audio_channel_mix_debug_category + +/* prototypes */ + + +static void gst_audio_channel_mix_set_property (GObject * object, + guint property_id, const GValue * value, GParamSpec * pspec); +static void gst_audio_channel_mix_get_property (GObject * object, + guint property_id, GValue * value, GParamSpec * pspec); +static void gst_audio_channel_mix_dispose (GObject * object); +static void gst_audio_channel_mix_finalize (GObject * object); + +static gboolean gst_audio_channel_mix_setup (GstAudioFilter * filter, + const GstAudioInfo * info); +static GstFlowReturn gst_audio_channel_mix_transform_ip (GstBaseTransform * + trans, GstBuffer * buf); + +enum +{ + PROP_0, + PROP_LEFT_TO_LEFT, + PROP_LEFT_TO_RIGHT, + PROP_RIGHT_TO_LEFT, + PROP_RIGHT_TO_RIGHT +}; + +/* pad templates */ + +static GstStaticPadTemplate gst_audio_channel_mix_src_template = +GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/x-raw,format=S16LE,rate=[1,max]," + "channels=2,layout=interleaved") + ); + +static GstStaticPadTemplate gst_audio_channel_mix_sink_template = +GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/x-raw,format=S16LE,rate=[1,max]," + "channels=2,layout=interleaved") + ); + + +/* class initialization */ + +G_DEFINE_TYPE_WITH_CODE (GstAudioChannelMix, gst_audio_channel_mix, + GST_TYPE_AUDIO_FILTER, + GST_DEBUG_CATEGORY_INIT (gst_audio_channel_mix_debug_category, + "audiochannelmix", 0, "debug category for audiochannelmix element")); + +static void +gst_audio_channel_mix_class_init (GstAudioChannelMixClass * klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + GstBaseTransformClass *base_transform_class = + GST_BASE_TRANSFORM_CLASS (klass); + GstAudioFilterClass *audio_filter_class = GST_AUDIO_FILTER_CLASS (klass); + + /* Setting up pads and setting metadata should be moved to + base_class_init if you intend to subclass this class. */ + gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass), + gst_static_pad_template_get (&gst_audio_channel_mix_src_template)); + gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass), + gst_static_pad_template_get (&gst_audio_channel_mix_sink_template)); + + gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass), + "Simple stereo audio mixer", "Audio/Mixer", "Mixes left/right channels " + "of stereo audio", "David Schleef <ds@schleef.org>"); + + gobject_class->set_property = gst_audio_channel_mix_set_property; + gobject_class->get_property = gst_audio_channel_mix_get_property; + gobject_class->dispose = gst_audio_channel_mix_dispose; + gobject_class->finalize = gst_audio_channel_mix_finalize; + audio_filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_channel_mix_setup); + base_transform_class->transform_ip = + GST_DEBUG_FUNCPTR (gst_audio_channel_mix_transform_ip); + + g_object_class_install_property (gobject_class, PROP_LEFT_TO_LEFT, + g_param_spec_double ("left-to-left", "Left to Left", + "Left channel to left channel gain", + -G_MAXDOUBLE, G_MAXDOUBLE, 1.0, + GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_class, PROP_LEFT_TO_RIGHT, + g_param_spec_double ("left-to-right", "Left to Right", + "Left channel to right channel gain", + -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, + GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_class, PROP_RIGHT_TO_LEFT, + g_param_spec_double ("right-to-left", "Right to Left", + "Right channel to left channel gain", + -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, + GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_class, PROP_RIGHT_TO_RIGHT, + g_param_spec_double ("right-to-right", "Right to Right", + "Right channel to right channel gain", + -G_MAXDOUBLE, G_MAXDOUBLE, 1.0, + GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); +} + +static void +gst_audio_channel_mix_init (GstAudioChannelMix * audiochannelmix) +{ + audiochannelmix->left_to_left = 1.0; + audiochannelmix->left_to_right = 0.0; + audiochannelmix->right_to_left = 0.0; + audiochannelmix->right_to_right = 1.0; +} + +void +gst_audio_channel_mix_set_property (GObject * object, guint property_id, + const GValue * value, GParamSpec * pspec) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object); + + GST_DEBUG_OBJECT (audiochannelmix, "set_property"); + + switch (property_id) { + case PROP_LEFT_TO_LEFT: + audiochannelmix->left_to_left = g_value_get_double (value); + break; + case PROP_LEFT_TO_RIGHT: + audiochannelmix->left_to_right = g_value_get_double (value); + break; + case PROP_RIGHT_TO_LEFT: + audiochannelmix->right_to_left = g_value_get_double (value); + break; + case PROP_RIGHT_TO_RIGHT: + audiochannelmix->right_to_right = g_value_get_double (value); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +void +gst_audio_channel_mix_get_property (GObject * object, guint property_id, + GValue * value, GParamSpec * pspec) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object); + + GST_DEBUG_OBJECT (audiochannelmix, "get_property"); + + switch (property_id) { + case PROP_LEFT_TO_LEFT: + g_value_set_double (value, audiochannelmix->left_to_left); + break; + case PROP_LEFT_TO_RIGHT: + g_value_set_double (value, audiochannelmix->left_to_right); + break; + case PROP_RIGHT_TO_LEFT: + g_value_set_double (value, audiochannelmix->right_to_left); + break; + case PROP_RIGHT_TO_RIGHT: + g_value_set_double (value, audiochannelmix->right_to_right); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +void +gst_audio_channel_mix_dispose (GObject * object) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object); + + GST_DEBUG_OBJECT (audiochannelmix, "dispose"); + + /* clean up as possible. may be called multiple times */ + + G_OBJECT_CLASS (gst_audio_channel_mix_parent_class)->dispose (object); +} + +void +gst_audio_channel_mix_finalize (GObject * object) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object); + + GST_DEBUG_OBJECT (audiochannelmix, "finalize"); + + /* clean up object here */ + + G_OBJECT_CLASS (gst_audio_channel_mix_parent_class)->finalize (object); +} + +static gboolean +gst_audio_channel_mix_setup (GstAudioFilter * filter, const GstAudioInfo * info) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (filter); + + GST_DEBUG_OBJECT (audiochannelmix, "setup"); + + return TRUE; +} + +static GstFlowReturn +gst_audio_channel_mix_transform_ip (GstBaseTransform * trans, GstBuffer * buf) +{ + GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (trans); + int n; + GstMapInfo map; + int i; + double ll = audiochannelmix->left_to_left; + double lr = audiochannelmix->left_to_right; + double rl = audiochannelmix->right_to_left; + double rr = audiochannelmix->right_to_right; + int l, r; + gint16 *data; + + GST_DEBUG_OBJECT (audiochannelmix, "transform_ip"); + + gst_buffer_map (buf, &map, GST_MAP_WRITE | GST_MAP_READ); + + n = gst_buffer_get_size (buf) >> 2; + data = (gint16 *) map.data; + for (i = 0; i < n; i++) { + l = data[2 * i + 0]; + r = data[2 * i + 1]; + data[2 * i + 0] = CLAMP (rint (ll * l + rl * r), -32768, 32767); + data[2 * i + 1] = CLAMP (rint (lr * l + rr * r), -32768, 32767); + } + + gst_buffer_unmap (buf, &map); + + return GST_FLOW_OK; +} |