gstreamer/gst/law/alaw-decode.c

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/* Gnome-Streamer
* 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.
*/
#include <gst/gst.h>
#include "alaw-decode.h"
#include "mulaw-conversion.h"
#include "alaw-conversion.h"
extern GstPadTemplate *alawdec_src_template, *alawdec_sink_template;
/* Stereo signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0
};
static void gst_alawdec_class_init (GstALawDecClass *klass);
static void gst_alawdec_init (GstALawDec *alawdec);
static void gst_alawdec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_alawdec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_alawdec_chain (GstPad *pad, GstBuffer *buf);
static GstElementClass *parent_class = NULL;
//static guint gst_stereo_signals[LAST_SIGNAL] = { 0 };
static GstPadNegotiateReturn
alawdec_negotiate_sink (GstPad *pad, GstCaps **caps, gint counter)
{
GstCaps* tempcaps;
GstALawDec* alawdec=GST_ALAWDEC (GST_OBJECT_PARENT (pad));
if (*caps==NULL)
return GST_PAD_NEGOTIATE_FAIL;
tempcaps = gst_caps_copy(*caps);
gst_caps_set(tempcaps,"format",GST_PROPS_STRING("int"));
gst_caps_set(tempcaps,"law",GST_PROPS_INT(0));
gst_caps_set(tempcaps,"depth",GST_PROPS_INT(16));
gst_caps_set(tempcaps,"width",GST_PROPS_INT(16));
gst_caps_set(tempcaps,"signed",GST_PROPS_BOOLEAN(TRUE));
if (gst_pad_set_caps (alawdec->srcpad, tempcaps))
{
return GST_PAD_NEGOTIATE_AGREE;
}
else {
gst_caps_unref (tempcaps);
return GST_PAD_NEGOTIATE_FAIL;
}
}
GType
gst_alawdec_get_type(void) {
static GType alawdec_type = 0;
if (!alawdec_type) {
static const GTypeInfo alawdec_info = {
sizeof(GstALawDecClass), NULL,
NULL,
(GClassInitFunc)gst_alawdec_class_init,
NULL,
NULL,
sizeof(GstALawDec),
0,
(GInstanceInitFunc)gst_alawdec_init,
};
alawdec_type = g_type_register_static(GST_TYPE_ELEMENT, "GstALawDec", &alawdec_info, 0);
}
return alawdec_type;
}
static void
gst_alawdec_class_init (GstALawDecClass *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_alawdec_set_property;
gobject_class->get_property = gst_alawdec_get_property;
}
static void
gst_alawdec_init (GstALawDec *alawdec)
{
alawdec->sinkpad = gst_pad_new_from_template(alawdec_sink_template,"sink");
alawdec->srcpad = gst_pad_new_from_template(alawdec_src_template,"src");
gst_pad_set_negotiate_function(alawdec->sinkpad, alawdec_negotiate_sink);
gst_element_add_pad(GST_ELEMENT(alawdec),alawdec->sinkpad);
gst_pad_set_chain_function(alawdec->sinkpad,gst_alawdec_chain);
gst_element_add_pad(GST_ELEMENT(alawdec),alawdec->srcpad);
}
static void
gst_alawdec_chain (GstPad *pad,GstBuffer *buf)
{
GstALawDec *alawdec;
gint16 *linear_data;
guint8 *alaw_data;
GstBuffer* outbuf;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
alawdec = GST_ALAWDEC(GST_OBJECT_PARENT (pad));
g_return_if_fail(alawdec != NULL);
g_return_if_fail(GST_IS_ALAWDEC(alawdec));
alaw_data = (guint8 *)GST_BUFFER_DATA(buf);
outbuf=gst_buffer_new();
GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf));
GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf)*2;
linear_data = (gint16*)GST_BUFFER_DATA(outbuf);
isdn_audio_alaw2ulaw(alaw_data,GST_BUFFER_SIZE(buf));
mulaw_decode(alaw_data,linear_data,GST_BUFFER_SIZE(buf));
gst_buffer_unref(buf);
gst_pad_push(alawdec->srcpad,outbuf);
}
static void
gst_alawdec_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstALawDec *alawdec;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_ALAWDEC(object));
alawdec = GST_ALAWDEC(object);
switch (prop_id) {
default:
break;
}
}
static void
gst_alawdec_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstALawDec *alawdec;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_ALAWDEC(object));
alawdec = GST_ALAWDEC(object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}