gstreamer/gst/rtp/gstrtph263pdec.c
Andy Wingo 7ebd7b97d4 All plugins updated for element state changes.
Original commit message from CVS:
2005-09-02  Andy Wingo  <wingo@pobox.com>

* All plugins updated for element state changes.
2005-09-02 15:44:50 +00:00

315 lines
7.9 KiB
C

/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
*
* 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 "gstrtph263pdec.h"
/* elementfactory information */
static GstElementDetails gst_rtp_h263pdec_details = {
"RTP packet parser",
"Codec/Parser/Network",
"Extracts H263+ video from RTP packets (RFC 2429)",
"Wim Taymans <wim@fluendo.com>"
};
/* RtpH263PDec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_FREQUENCY
};
static GstStaticPadTemplate gst_rtph263pdec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-h263")
);
static GstStaticPadTemplate gst_rtph263pdec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static void gst_rtph263pdec_class_init (GstRtpH263PDecClass * klass);
static void gst_rtph263pdec_base_init (GstRtpH263PDecClass * klass);
static void gst_rtph263pdec_init (GstRtpH263PDec * rtph263pdec);
static GstFlowReturn gst_rtph263pdec_chain (GstPad * pad, GstBuffer * buffer);
static void gst_rtph263pdec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtph263pdec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_rtph263pdec_change_state (GstElement *
element, GstStateChange transition);
static GstElementClass *parent_class = NULL;
static GType
gst_rtph263pdec_get_type (void)
{
static GType rtph263pdec_type = 0;
if (!rtph263pdec_type) {
static const GTypeInfo rtph263pdec_info = {
sizeof (GstRtpH263PDecClass),
(GBaseInitFunc) gst_rtph263pdec_base_init,
NULL,
(GClassInitFunc) gst_rtph263pdec_class_init,
NULL,
NULL,
sizeof (GstRtpH263PDec),
0,
(GInstanceInitFunc) gst_rtph263pdec_init,
};
rtph263pdec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstRtpH263PDec",
&rtph263pdec_info, 0);
}
return rtph263pdec_type;
}
static void
gst_rtph263pdec_base_init (GstRtpH263PDecClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtph263pdec_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtph263pdec_sink_template));
gst_element_class_set_details (element_class, &gst_rtp_h263pdec_details);
}
static void
gst_rtph263pdec_class_init (GstRtpH263PDecClass * 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_rtph263pdec_set_property;
gobject_class->get_property = gst_rtph263pdec_get_property;
gstelement_class->change_state = gst_rtph263pdec_change_state;
}
static void
gst_rtph263pdec_init (GstRtpH263PDec * rtph263pdec)
{
rtph263pdec->srcpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtph263pdec_src_template), "src");
gst_element_add_pad (GST_ELEMENT (rtph263pdec), rtph263pdec->srcpad);
rtph263pdec->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&gst_rtph263pdec_sink_template), "sink");
gst_pad_set_chain_function (rtph263pdec->sinkpad, gst_rtph263pdec_chain);
gst_element_add_pad (GST_ELEMENT (rtph263pdec), rtph263pdec->sinkpad);
rtph263pdec->adapter = gst_adapter_new ();
}
static GstFlowReturn
gst_rtph263pdec_chain (GstPad * pad, GstBuffer * buf)
{
GstRtpH263PDec *rtph263pdec;
GstBuffer *outbuf;
GstFlowReturn ret;
GstRTPPayload pt;
rtph263pdec = GST_RTP_H263P_DEC (GST_OBJECT_PARENT (pad));
if (!gst_rtpbuffer_validate (buf))
goto bad_packet;
if ((pt = gst_rtpbuffer_get_payload_type (buf)) != 0)
goto bad_payload;
{
gint payload_len;
guint8 *payload;
gboolean P, V, M;
guint32 timestamp;
guint header_len;
guint8 PLEN;
payload_len = gst_rtpbuffer_get_payload_len (buf);
payload = gst_rtpbuffer_get_payload (buf);
header_len = 2;
M = gst_rtpbuffer_get_marker (buf);
P = (payload[0] & 0x04) == 0x04;
V = (payload[0] & 0x02) == 0x02;
PLEN = ((payload[0] & 0x1) << 5) | (payload[1] >> 3);
if (V) {
header_len++;
}
if (PLEN) {
header_len += PLEN;
}
if (P) {
header_len -= 2;
payload[header_len] = 0;
payload[header_len + 1] = 0;
}
/* strip off header */
payload += header_len;
payload_len -= header_len;
timestamp = gst_rtpbuffer_get_timestamp (buf);
if (M) {
/* frame is completed: append to previous, push it out */
guint avail;
guint8 *data;
avail = gst_adapter_available (rtph263pdec->adapter);
outbuf = gst_buffer_new_and_alloc (avail + payload_len);
/* prepend previous data */
if (avail > 0) {
data = (guint8 *) gst_adapter_peek (rtph263pdec->adapter, avail);
memcpy (GST_BUFFER_DATA (outbuf), data, avail);
gst_adapter_flush (rtph263pdec->adapter, avail);
}
memcpy (GST_BUFFER_DATA (outbuf) + avail, payload, payload_len);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / 90000;
gst_buffer_set_caps (outbuf,
(GstCaps *) gst_pad_get_pad_template_caps (rtph263pdec->srcpad));
ret = gst_pad_push (rtph263pdec->srcpad, outbuf);
} else {
/* frame not completed: store in adapter */
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
gst_adapter_push (rtph263pdec->adapter, outbuf);
ret = GST_FLOW_OK;
}
gst_buffer_unref (buf);
}
return ret;
bad_packet:
{
GST_DEBUG ("Packet does 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_rtph263pdec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpH263PDec *rtph263pdec;
rtph263pdec = GST_RTP_H263P_DEC (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtph263pdec_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstRtpH263PDec *rtph263pdec;
rtph263pdec = GST_RTP_H263P_DEC (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_rtph263pdec_change_state (GstElement * element, GstStateChange transition)
{
GstRtpH263PDec *rtph263pdec;
GstStateChangeReturn ret;
rtph263pdec = GST_RTP_H263P_DEC (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_rtph263pdec_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtph263pdec",
GST_RANK_NONE, GST_TYPE_RTP_H263P_DEC);
}