gstreamer/gst/rtp/gstrtpj2kdepay.c

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/* GStreamer
* Copyright (C) <2009> Wim Taymans <wim.taymans@gmail.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 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/rtp/gstrtpbuffer.h>
#include <string.h>
#include "gstrtpj2kdepay.h"
GST_DEBUG_CATEGORY_STATIC (rtpj2kdepay_debug);
#define GST_CAT_DEFAULT (rtpj2kdepay_debug)
/* elementfactory information */
static const GstElementDetails gst_rtp_j2kdepay_details =
GST_ELEMENT_DETAILS ("RTP JPEG 2000 depayloader",
"Codec/Depayloader/Network",
"Extracts JPEG 2000 video from RTP packets (RFC 5371)",
"Wim Taymans <wim.taymans@gmail.com>");
static GstStaticPadTemplate gst_rtp_j2k_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/x-jpc")
);
static GstStaticPadTemplate gst_rtp_j2k_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"JPEG2000\"")
);
GST_BOILERPLATE (GstRtpJ2KDepay, gst_rtp_j2k_depay, GstBaseRTPDepayload,
GST_TYPE_BASE_RTP_DEPAYLOAD);
static void gst_rtp_j2k_depay_finalize (GObject * object);
static GstStateChangeReturn
gst_rtp_j2k_depay_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_rtp_j2k_depay_setcaps (GstBaseRTPDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_j2k_depay_process (GstBaseRTPDepayload * depayload,
GstBuffer * buf);
static void
gst_rtp_j2k_depay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_j2k_depay_src_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_rtp_j2k_depay_sink_template));
gst_element_class_set_details (element_class, &gst_rtp_j2kdepay_details);
}
static void
gst_rtp_j2k_depay_class_init (GstRtpJ2KDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_j2k_depay_finalize;
gstelement_class->change_state = gst_rtp_j2k_depay_change_state;
gstbasertpdepayload_class->set_caps = gst_rtp_j2k_depay_setcaps;
gstbasertpdepayload_class->process = gst_rtp_j2k_depay_process;
GST_DEBUG_CATEGORY_INIT (rtpj2kdepay_debug, "rtpj2kdepay", 0,
"J2K Video RTP Depayloader");
}
static void
gst_rtp_j2k_depay_init (GstRtpJ2KDepay * rtpj2kdepay,
GstRtpJ2KDepayClass * klass)
{
rtpj2kdepay->adapter = gst_adapter_new ();
}
static void
gst_rtp_j2k_depay_finalize (GObject * object)
{
GstRtpJ2KDepay *rtpj2kdepay;
rtpj2kdepay = GST_RTP_J2K_DEPAY (object);
g_object_unref (rtpj2kdepay->adapter);
rtpj2kdepay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rtp_j2k_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
gint clock_rate;
GstCaps *outcaps;
gboolean res;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000;
depayload->clock_rate = clock_rate;
outcaps =
gst_caps_new_simple ("image/x-jpc", "framerate", GST_TYPE_FRACTION, 0, 1,
"fields", G_TYPE_INT, 1, "fourcc", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('s',
'Y', 'U', 'V'), NULL);
res = gst_pad_set_caps (depayload->srcpad, outcaps);
gst_caps_unref (outcaps);
return res;
}
static GstBuffer *
gst_rtp_j2k_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
{
GstRtpJ2KDepay *rtpj2kdepay;
GstBuffer *outbuf;
guint8 *payload;
guint frag_offset;
rtpj2kdepay = GST_RTP_J2K_DEPAY (depayload);
/* flush everything on discont for now */
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_DEBUG_OBJECT (rtpj2kdepay, "DISCONT, flushing data");
gst_adapter_clear (rtpj2kdepay->adapter);
rtpj2kdepay->need_header = TRUE;
}
if (gst_rtp_buffer_get_payload_len (buf) < 8)
goto empty_packet;
payload = gst_rtp_buffer_get_payload (buf);
/*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |tp |MHF|mh_id|T| priority | tile number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |reserved | fragment offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
frag_offset = (payload[5] << 16) | (payload[6] << 8) | payload[7];
GST_DEBUG_OBJECT (rtpj2kdepay, "frag %u", frag_offset);
if (rtpj2kdepay->need_header) {
if (frag_offset != 0)
goto waiting_header;
rtpj2kdepay->need_header = FALSE;
}
/* take JPEG 2000 data, push in the adapter */
outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 8, -1);
gst_adapter_push (rtpj2kdepay->adapter, outbuf);
outbuf = NULL;
if (gst_rtp_buffer_get_marker (buf)) {
guint avail;
guint8 end[2];
guint8 *data;
/* last buffer take all data out of the adapter */
avail = gst_adapter_available (rtpj2kdepay->adapter);
GST_DEBUG_OBJECT (rtpj2kdepay, "marker set, last buffer");
/* take the last bytes of the JPEG 2000 data to see if there is an EOC
* marker */
gst_adapter_copy (rtpj2kdepay->adapter, end, avail - 2, 2);
if (end[0] != 0xff && end[1] != 0xd9) {
GST_DEBUG_OBJECT (rtpj2kdepay, "no EOC marker, adding one");
/* no EOI marker, add one */
outbuf = gst_buffer_new_and_alloc (2);
data = GST_BUFFER_DATA (outbuf);
data[0] = 0xff;
data[1] = 0xd9;
gst_adapter_push (rtpj2kdepay->adapter, outbuf);
avail += 2;
}
outbuf = gst_adapter_take_buffer (rtpj2kdepay->adapter, avail);
GST_DEBUG_OBJECT (rtpj2kdepay, "returning %u bytes", avail);
}
return outbuf;
/* ERRORS */
empty_packet:
{
GST_ELEMENT_WARNING (rtpj2kdepay, STREAM, DECODE,
("Empty Payload."), (NULL));
return NULL;
}
waiting_header:
{
GST_DEBUG_OBJECT (rtpj2kdepay, "we are waiting for a header");
return NULL;
}
}
static GstStateChangeReturn
gst_rtp_j2k_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpJ2KDepay *rtpj2kdepay;
GstStateChangeReturn ret;
rtpj2kdepay = GST_RTP_J2K_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (rtpj2kdepay->adapter);
rtpj2kdepay->need_header = TRUE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_adapter_clear (rtpj2kdepay->adapter);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_j2k_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpj2kdepay",
GST_RANK_MARGINAL, GST_TYPE_RTP_J2K_DEPAY);
}