gstreamer/gst/rtp/gstrtpgsmparse.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 <gst/rtp/gstrtpbuffer.h>
#include "gstrtpgsmparse.h"
/* elementfactory information */
static GstElementDetails gst_rtp_gsmparse_details = {
"RTP packet parser",
"Codec/Parser/Network",
"Extracts GSM audio from RTP packets",
"Zeeshan Ali <zak147@yahoo.com>"
};
/* RtpGSMParse signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_FREQUENCY
};
static GstStaticPadTemplate gst_rtpgsmparse_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-gsm, " "rate = (int) [ 1000, 48000 ]")
);
static GstStaticPadTemplate gst_rtpgsmparse_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"audio\", "
"payload = (int) [ 96, 255 ], "
"clock-rate = (int) 8000, " "encoding-name = (string) \"GSM\"")
);
static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
static void gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass);
static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
static GstFlowReturn gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buffer);
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 GstStateChangeReturn gst_rtpgsmparse_change_state (GstElement * element,
GstStateChange transition);
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),
(GBaseInitFunc) gst_rtpgsmparse_base_init,
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_base_init (GstRtpGSMParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpgsmparse_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtpgsmparse_sink_template));
gst_element_class_set_details (element_class, &gst_rtp_gsmparse_details);
}
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);
gobject_class->set_property = gst_rtpgsmparse_set_property;
gobject_class->get_property = gst_rtpgsmparse_get_property;
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));
gstelement_class->change_state = gst_rtpgsmparse_change_state;
}
static void
gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
{
rtpgsmparse->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtpgsmparse_src_template), "src");
rtpgsmparse->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtpgsmparse_sink_template), "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;
}
static void
gst_rtpgsm_caps_nego (GstRtpGSMParse * rtpgsmparse)
{
GstCaps *caps;
caps = gst_caps_new_simple ("audio/x-gsm",
"rate", G_TYPE_INT, rtpgsmparse->frequency, NULL);
gst_pad_set_caps (rtpgsmparse->srcpad, caps);
gst_caps_unref (caps);
}
static GstFlowReturn
gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf)
{
GstRtpGSMParse *rtpgsmparse;
GstBuffer *outbuf;
GstFlowReturn ret;
guint8 pt;
rtpgsmparse = GST_RTP_GSM_PARSE (gst_pad_get_parent (pad));
if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
gst_rtpgsm_caps_nego (rtpgsmparse);
}
if (!gst_rtpbuffer_validate (buf))
goto bad_packet;
if ((pt = gst_rtpbuffer_get_payload_type (buf)) != GST_RTP_PAYLOAD_GSM)
goto bad_payload;
{
gint payload_len;
guint8 *payload;
guint32 timestamp;
payload_len = gst_rtpbuffer_get_payload_len (buf);
payload = gst_rtpbuffer_get_payload (buf);
timestamp = gst_rtpbuffer_get_timestamp (buf);
outbuf = gst_buffer_new_and_alloc (payload_len);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / 8000;
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
GST_DEBUG ("pushing buffer of size %d", GST_BUFFER_SIZE (outbuf));
gst_buffer_unref (buf);
ret = gst_pad_push (rtpgsmparse->srcpad, outbuf);
}
return ret;
bad_packet:
{
GST_DEBUG ("Packet did not validate");
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
bad_payload:
{
GST_DEBUG ("Unexpected payload type %u", pt);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static void
gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpGSMParse *rtpgsmparse;
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;
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 GstStateChangeReturn
gst_rtpgsmparse_change_state (GstElement * element, GstStateChange transition)
{
GstRtpGSMParse *rtpgsmparse;
GstStateChangeReturn ret;
rtpgsmparse = GST_RTP_GSM_PARSE (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtpgsmparse_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpgsmparse",
GST_RANK_NONE, GST_TYPE_RTP_GSM_PARSE);
}