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252 lines
8.2 KiB
C
252 lines
8.2 KiB
C
/* GStreamer
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* Copyright (C) 2013 David Schleef <ds@schleef.org>
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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., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-audiochannelmix
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* @title: gstaudiochannelmix
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*
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* The audiochannelmix element mixes channels in stereo audio based on
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* properties set on the element. The primary purpose is reconstruct
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* equal left/right channels on an input stream that has audio in only
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* one channel.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v audiotestsrc ! audiochannelmix ! autoaudiosink
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* ]|
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*
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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/audio/gstaudiofilter.h>
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#include "gstaudiochannelmix.h"
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#include <math.h>
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GST_DEBUG_CATEGORY_STATIC (gst_audio_channel_mix_debug_category);
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#define GST_CAT_DEFAULT gst_audio_channel_mix_debug_category
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/* prototypes */
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static void gst_audio_channel_mix_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_audio_channel_mix_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static gboolean gst_audio_channel_mix_setup (GstAudioFilter * filter,
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const GstAudioInfo * info);
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static GstFlowReturn gst_audio_channel_mix_transform_ip (GstBaseTransform *
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trans, GstBuffer * buf);
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enum
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{
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PROP_0,
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PROP_LEFT_TO_LEFT,
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PROP_LEFT_TO_RIGHT,
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PROP_RIGHT_TO_LEFT,
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PROP_RIGHT_TO_RIGHT
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};
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/* pad templates */
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static GstStaticPadTemplate gst_audio_channel_mix_src_template =
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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,format=S16LE,rate=[1,max],"
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"channels=2,layout=interleaved")
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);
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static GstStaticPadTemplate gst_audio_channel_mix_sink_template =
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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,format=S16LE,rate=[1,max],"
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"channels=2,layout=interleaved")
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);
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstAudioChannelMix, gst_audio_channel_mix,
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GST_TYPE_AUDIO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_audio_channel_mix_debug_category,
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"audiochannelmix", 0, "debug category for audiochannelmix element"));
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GST_ELEMENT_REGISTER_DEFINE (audiochannelmix, "audiochannelmix", GST_RANK_NONE,
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GST_TYPE_AUDIO_CHANNEL_MIX);
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static void
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gst_audio_channel_mix_class_init (GstAudioChannelMixClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstBaseTransformClass *base_transform_class =
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GST_BASE_TRANSFORM_CLASS (klass);
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GstAudioFilterClass *audio_filter_class = GST_AUDIO_FILTER_CLASS (klass);
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/* Setting up pads and setting metadata should be moved to
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base_class_init if you intend to subclass this class. */
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gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
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&gst_audio_channel_mix_src_template);
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gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
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&gst_audio_channel_mix_sink_template);
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Simple stereo audio mixer", "Audio/Mixer", "Mixes left/right channels "
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"of stereo audio", "David Schleef <ds@schleef.org>");
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gobject_class->set_property = gst_audio_channel_mix_set_property;
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gobject_class->get_property = gst_audio_channel_mix_get_property;
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audio_filter_class->setup = GST_DEBUG_FUNCPTR (gst_audio_channel_mix_setup);
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base_transform_class->transform_ip =
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GST_DEBUG_FUNCPTR (gst_audio_channel_mix_transform_ip);
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g_object_class_install_property (gobject_class, PROP_LEFT_TO_LEFT,
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g_param_spec_double ("left-to-left", "Left to Left",
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"Left channel to left channel gain",
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-G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_LEFT_TO_RIGHT,
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g_param_spec_double ("left-to-right", "Left to Right",
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"Left channel to right channel gain",
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-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_RIGHT_TO_LEFT,
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g_param_spec_double ("right-to-left", "Right to Left",
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"Right channel to left channel gain",
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-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_RIGHT_TO_RIGHT,
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g_param_spec_double ("right-to-right", "Right to Right",
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"Right channel to right channel gain",
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-G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_audio_channel_mix_init (GstAudioChannelMix * audiochannelmix)
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{
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audiochannelmix->left_to_left = 1.0;
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audiochannelmix->left_to_right = 0.0;
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audiochannelmix->right_to_left = 0.0;
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audiochannelmix->right_to_right = 1.0;
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}
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void
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gst_audio_channel_mix_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object);
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GST_DEBUG_OBJECT (audiochannelmix, "set_property");
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switch (property_id) {
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case PROP_LEFT_TO_LEFT:
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audiochannelmix->left_to_left = g_value_get_double (value);
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break;
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case PROP_LEFT_TO_RIGHT:
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audiochannelmix->left_to_right = g_value_get_double (value);
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break;
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case PROP_RIGHT_TO_LEFT:
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audiochannelmix->right_to_left = g_value_get_double (value);
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break;
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case PROP_RIGHT_TO_RIGHT:
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audiochannelmix->right_to_right = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_audio_channel_mix_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (object);
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GST_DEBUG_OBJECT (audiochannelmix, "get_property");
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switch (property_id) {
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case PROP_LEFT_TO_LEFT:
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g_value_set_double (value, audiochannelmix->left_to_left);
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break;
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case PROP_LEFT_TO_RIGHT:
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g_value_set_double (value, audiochannelmix->left_to_right);
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break;
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case PROP_RIGHT_TO_LEFT:
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g_value_set_double (value, audiochannelmix->right_to_left);
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break;
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case PROP_RIGHT_TO_RIGHT:
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g_value_set_double (value, audiochannelmix->right_to_right);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_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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gst_audio_channel_mix_setup (GstAudioFilter * filter, const GstAudioInfo * info)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (filter);
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GST_DEBUG_OBJECT (audiochannelmix, "setup");
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#endif
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return TRUE;
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}
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static GstFlowReturn
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gst_audio_channel_mix_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstAudioChannelMix *audiochannelmix = GST_AUDIO_CHANNEL_MIX (trans);
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int n;
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GstMapInfo map;
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int i;
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double ll = audiochannelmix->left_to_left;
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double lr = audiochannelmix->left_to_right;
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double rl = audiochannelmix->right_to_left;
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double rr = audiochannelmix->right_to_right;
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int l, r;
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gint16 *data;
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GST_DEBUG_OBJECT (audiochannelmix, "transform_ip");
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gst_buffer_map (buf, &map, GST_MAP_WRITE | GST_MAP_READ);
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n = gst_buffer_get_size (buf) >> 2;
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data = (gint16 *) map.data;
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for (i = 0; i < n; i++) {
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l = data[2 * i + 0];
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r = data[2 * i + 1];
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data[2 * i + 0] = CLAMP (rint (ll * l + rl * r), -32768, 32767);
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data[2 * i + 1] = CLAMP (rint (lr * l + rr * r), -32768, 32767);
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}
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gst_buffer_unmap (buf, &map);
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return GST_FLOW_OK;
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}
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