gstreamer/gst/law/mulaw-encode.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "mulaw-encode.h"
#include "mulaw-conversion.h"
extern GstPadTemplate *mulawenc_src_template, *mulawenc_sink_template;
/* elementfactory information */
static GstElementDetails mulawenc_details = {
"PCM to Mu Law conversion",
"Codec/Encoder/Audio",
"Convert 16bit PCM to 8bit mu law",
"Zaheer Merali <zaheer@bellworldwide.net>"
};
/* Stereo signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
};
static void gst_mulawenc_class_init (GstMuLawEncClass * klass);
static void gst_mulawenc_base_init (GstMuLawEncClass * klass);
static void gst_mulawenc_init (GstMuLawEnc * mulawenc);
static void gst_mulawenc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mulawenc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_mulawenc_chain (GstPad * pad, GstData * _data);
static GstElementClass *parent_class = NULL;
/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
static GstPadLinkReturn
mulawenc_link (GstPad * pad, const GstCaps * caps)
{
GstCaps *tempcaps;
gint rate, channels;
GstStructure *structure;
gboolean ret;
GstMuLawEnc *mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "rate", &rate);
ret = gst_structure_get_int (structure, "channels", &channels);
if (!ret)
return GST_PAD_LINK_REFUSED;
tempcaps = gst_caps_new_simple ("audio/x-mulaw",
"depth", G_TYPE_INT, 8,
"width", G_TYPE_INT, 8,
"signed", G_TYPE_BOOLEAN, FALSE,
"rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels, NULL);
return gst_pad_try_set_caps (mulawenc->srcpad, tempcaps);
}
GType
gst_mulawenc_get_type (void)
{
static GType mulawenc_type = 0;
if (!mulawenc_type) {
static const GTypeInfo mulawenc_info = {
sizeof (GstMuLawEncClass),
(GBaseInitFunc) gst_mulawenc_base_init,
NULL,
(GClassInitFunc) gst_mulawenc_class_init,
NULL,
NULL,
sizeof (GstMuLawEnc),
0,
(GInstanceInitFunc) gst_mulawenc_init,
};
mulawenc_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info,
0);
}
return mulawenc_type;
}
static void
gst_mulawenc_base_init (GstMuLawEncClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class, mulawenc_src_template);
gst_element_class_add_pad_template (element_class, mulawenc_sink_template);
gst_element_class_set_details (element_class, &mulawenc_details);
}
static void
gst_mulawenc_class_init (GstMuLawEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property = gst_mulawenc_set_property;
gobject_class->get_property = gst_mulawenc_get_property;
}
static void
gst_mulawenc_init (GstMuLawEnc * mulawenc)
{
mulawenc->sinkpad =
gst_pad_new_from_template (mulawenc_sink_template, "sink");
mulawenc->srcpad = gst_pad_new_from_template (mulawenc_src_template, "src");
gst_pad_set_link_function (mulawenc->sinkpad, mulawenc_link);
gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->sinkpad);
gst_pad_set_chain_function (mulawenc->sinkpad, gst_mulawenc_chain);
gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
}
static void
gst_mulawenc_chain (GstPad * pad, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstMuLawEnc *mulawenc;
gint16 *linear_data;
guint8 *mulaw_data;
GstBuffer *outbuf;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
g_return_if_fail (mulawenc != NULL);
g_return_if_fail (GST_IS_MULAWENC (mulawenc));
linear_data = (gint16 *) GST_BUFFER_DATA (buf);
outbuf = gst_buffer_new ();
GST_BUFFER_DATA (outbuf) =
(gchar *) g_new (gint16, GST_BUFFER_SIZE (buf) / 4);
GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf) / 2;
mulaw_data = (gint8 *) GST_BUFFER_DATA (outbuf);
mulaw_encode (linear_data, mulaw_data, GST_BUFFER_SIZE (outbuf));
gst_buffer_unref (buf);
gst_pad_push (mulawenc->srcpad, GST_DATA (outbuf));
}
static void
gst_mulawenc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMuLawEnc *mulawenc;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULAWENC (object));
mulawenc = GST_MULAWENC (object);
switch (prop_id) {
default:
break;
}
}
static void
gst_mulawenc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMuLawEnc *mulawenc;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_MULAWENC (object));
mulawenc = GST_MULAWENC (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}