gstreamer/gst/rtp/gstrtpgsmdepay.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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include "gstrtpgsmparse.h"
#include "gstrtp-common.h"
/* elementfactory information */
static GstElementDetails gst_rtp_gsmparse_details = {
"RTP packet parser",
"RtpGSMParse",
"GPL",
"Extracts GSM audio from RTP packets",
VERSION,
"Zeeshan Ali <zak147@yahoo.com>",
"(C) 2003",
};
/* RtpGSMParse signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_FREQUENCY
};
GST_PAD_TEMPLATE_FACTORY (src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"gsm_gsm",
"audio/x-gsm",
"rate", GST_PROPS_INT_RANGE (1000, 48000))
)
GST_PAD_TEMPLATE_FACTORY (sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"rtp",
"application/x-rtp",
NULL)
);
static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
static void gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf);
static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement * element);
static GstElementClass *parent_class = NULL;
static GType gst_rtpgsmparse_get_type (void)
{
static GType rtpgsmparse_type = 0;
if (!rtpgsmparse_type) {
static const GTypeInfo rtpgsmparse_info = {
sizeof (GstRtpGSMParseClass),
NULL,
NULL,
(GClassInitFunc) gst_rtpgsmparse_class_init,
NULL,
NULL,
sizeof (GstRtpGSMParse),
0,
(GInstanceInitFunc) gst_rtpgsmparse_init,
};
rtpgsmparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse", &rtpgsmparse_info, 0);
}
return rtpgsmparse_type;
}
static void
gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY,
g_param_spec_int ("frequency", "frequency", "frequency",
G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
gobject_class->set_property = gst_rtpgsmparse_set_property;
gobject_class->get_property = gst_rtpgsmparse_get_property;
gstelement_class->change_state = gst_rtpgsmparse_change_state;
}
static void
gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
{
rtpgsmparse->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
rtpgsmparse->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
rtpgsmparse->frequency = 8000;
}
void
gst_rtpgsmparse_ntohs (GstBuffer *buf)
{
gint16 *i, *len;
/* FIXME: is this code correct or even sane at all? */
i = (gint16 *) GST_BUFFER_DATA(buf);
len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
for (; i<len; i++) {
*i = g_ntohs (*i);
}
}
void
gst_rtpgsm_caps_nego (GstRtpGSMParse *rtpgsmparse)
{
GstCaps *caps;
caps = GST_CAPS_NEW (
"gsm_gsm",
"audio/x-gsm",
"rate", GST_PROPS_INT (rtpgsmparse->frequency));
gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
}
static void
gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf)
{
GstRtpGSMParse *rtpgsmparse;
GstBuffer *outbuf;
Rtp_Packet packet;
rtp_payload_t pt;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
g_return_if_fail (rtpgsmparse != NULL);
g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
if (GST_IS_EVENT (buf)) {
GstEvent *event = GST_EVENT (buf);
gst_pad_event_default (pad, event);
return;
}
if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
gst_rtpgsm_caps_nego (rtpgsmparse);
}
packet = rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
pt = rtp_packet_get_payload_type (packet);
if (pt != PAYLOAD_GSM) {
g_warning ("Unexpected paload type %u\n", pt);
rtp_packet_free (packet);
gst_buffer_unref (buf);
return;
}
outbuf = gst_buffer_new ();
GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet), GST_BUFFER_SIZE (outbuf));
GST_DEBUG ("gst_rtpgsmparse_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
/* FIXME: According to RFC 1890, this is required, right? */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gst_rtpgsmparse_ntohs (outbuf);
#endif
gst_pad_push (rtpgsmparse->srcpad, outbuf);
rtp_packet_free (packet);
gst_buffer_unref (buf);
}
static void
gst_rtpgsmparse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRtpGSMParse *rtpgsmparse;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
rtpgsmparse = GST_RTP_GSM_PARSE (object);
switch (prop_id) {
case ARG_FREQUENCY:
rtpgsmparse->frequency = g_value_get_int (value);
break;
default:
break;
}
}
static void
gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRtpGSMParse *rtpgsmparse;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
rtpgsmparse = GST_RTP_GSM_PARSE (object);
switch (prop_id) {
case ARG_FREQUENCY:
g_value_set_int (value, rtpgsmparse->frequency);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_rtpgsmparse_change_state (GstElement * element)
{
GstRtpGSMParse *rtpgsmparse;
g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
rtpgsmparse = GST_RTP_GSM_PARSE (element);
GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
/* if we haven't failed already, give the parent class a chance to ;-) */
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
gboolean
gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin)
{
GstElementFactory *rtpgsmparse;
rtpgsmparse = gst_element_factory_new ("rtpgsmparse", GST_TYPE_RTP_GSM_PARSE, &gst_rtp_gsmparse_details);
g_return_val_if_fail (rtpgsmparse != NULL, FALSE);
gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (src_factory));
gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmparse));
return TRUE;
}