gst/rtp/gstrtpgsmparse.c - imx-gst-plugins-good - Git at Google

 /* 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",
   "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")
     );


 static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
 static void gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass);
 static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);

 static void gst_rtpgsmparse_chain (GstPad * pad, GstData * _data);

 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),
       (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);

   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_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;
 }

 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_simple ("audio/x-gsm",
       "rate", G_TYPE_INT, rtpgsmparse->frequency, NULL);

   gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
 }

 static void
 gst_rtpgsmparse_chain (GstPad * pad, GstData * _data)
 {
   GstBuffer *buf = GST_BUFFER (_data);
   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, GST_DATA (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 (GstPlugin * plugin)
 {
   return gst_element_register (plugin, "rtpgsmparse",
       GST_RANK_NONE, GST_TYPE_RTP_GSM_PARSE);
 }
	/* 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",
	"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")
	);


	static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
	static void gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass);
	static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);

	static void gst_rtpgsmparse_chain (GstPad * pad, GstData * _data);

	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),
	(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);

	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_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;
	}

	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_simple ("audio/x-gsm",
	"rate", G_TYPE_INT, rtpgsmparse->frequency, NULL);

	gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
	}

	static void
	gst_rtpgsmparse_chain (GstPad * pad, GstData * _data)
	{
	GstBuffer *buf = GST_BUFFER (_data);
	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, GST_DATA (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 (GstPlugin * plugin)
	{
	return gst_element_register (plugin, "rtpgsmparse",
	GST_RANK_NONE, GST_TYPE_RTP_GSM_PARSE);
	}