gstreamer/gst/realmedia/rdtdepay.c

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/* GStreamer
* Copyright (C) <2006> Lutz Mueller <lutz at topfrose dot de>
* <2006> 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 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 <string.h>
#include "gstrdtbuffer.h"
#include "rdtdepay.h"
GST_DEBUG_CATEGORY_STATIC (rdtdepay_debug);
#define GST_CAT_DEFAULT rdtdepay_debug
/* RDTDepay signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
};
static GstStaticPadTemplate gst_rdt_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/vnd.rn-realmedia")
);
static GstStaticPadTemplate gst_rdt_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rdt, "
"media = (string) \"application\", "
"clock-rate = (int) [1, MAX ], "
"encoding-name = (string) \"X-REAL-RDT\""
/* All optional parameters
*
* "config="
*/
)
);
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#define gst_rdt_depay_parent_class parent_class
G_DEFINE_TYPE (GstRDTDepay, gst_rdt_depay, GST_TYPE_ELEMENT);
static void gst_rdt_depay_finalize (GObject * object);
static GstStateChangeReturn gst_rdt_depay_change_state (GstElement *
element, GstStateChange transition);
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static gboolean gst_rdt_depay_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_rdt_depay_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static void
gst_rdt_depay_class_init (GstRDTDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_rdt_depay_finalize;
gstelement_class->change_state = gst_rdt_depay_change_state;
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rdt_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rdt_depay_sink_template));
gst_element_class_set_static_metadata (gstelement_class, "RDT packet parser",
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"Codec/Depayloader/Network",
"Extracts RealMedia from RDT packets",
"Lutz Mueller <lutz at topfrose dot de>, "
"Wim Taymans <wim@fluendo.com>");
GST_DEBUG_CATEGORY_INIT (rdtdepay_debug, "rdtdepay",
0, "Depayloader for RDT RealMedia packets");
}
static void
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gst_rdt_depay_init (GstRDTDepay * rdtdepay)
{
rdtdepay->sinkpad =
gst_pad_new_from_static_template (&gst_rdt_depay_sink_template, "sink");
gst_pad_set_chain_function (rdtdepay->sinkpad, gst_rdt_depay_chain);
gst_pad_set_event_function (rdtdepay->sinkpad, gst_rdt_depay_sink_event);
gst_element_add_pad (GST_ELEMENT_CAST (rdtdepay), rdtdepay->sinkpad);
rdtdepay->srcpad =
gst_pad_new_from_static_template (&gst_rdt_depay_src_template, "src");
gst_element_add_pad (GST_ELEMENT_CAST (rdtdepay), rdtdepay->srcpad);
}
static void
gst_rdt_depay_finalize (GObject * object)
{
GstRDTDepay *rdtdepay;
rdtdepay = GST_RDT_DEPAY (object);
if (rdtdepay->header)
gst_buffer_unref (rdtdepay->header);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_rdt_depay_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
GstRDTDepay *rdtdepay;
GstCaps *srccaps;
gint clock_rate = 1000; /* default */
const GValue *value;
GstBuffer *header;
rdtdepay = GST_RDT_DEPAY (GST_PAD_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
if (gst_structure_has_field (structure, "clock-rate"))
gst_structure_get_int (structure, "clock-rate", &clock_rate);
/* config contains the RealMedia header as a buffer. */
value = gst_structure_get_value (structure, "config");
if (!value)
goto no_header;
header = gst_value_get_buffer (value);
if (!header)
goto no_header;
/* get other values for newsegment */
value = gst_structure_get_value (structure, "npt-start");
if (value && G_VALUE_HOLDS_UINT64 (value))
rdtdepay->npt_start = g_value_get_uint64 (value);
else
rdtdepay->npt_start = 0;
GST_DEBUG_OBJECT (rdtdepay, "NPT start %" G_GUINT64_FORMAT,
rdtdepay->npt_start);
value = gst_structure_get_value (structure, "npt-stop");
if (value && G_VALUE_HOLDS_UINT64 (value))
rdtdepay->npt_stop = g_value_get_uint64 (value);
else
rdtdepay->npt_stop = -1;
GST_DEBUG_OBJECT (rdtdepay, "NPT stop %" G_GUINT64_FORMAT,
rdtdepay->npt_stop);
value = gst_structure_get_value (structure, "play-speed");
if (value && G_VALUE_HOLDS_DOUBLE (value))
rdtdepay->play_speed = g_value_get_double (value);
else
rdtdepay->play_speed = 1.0;
value = gst_structure_get_value (structure, "play-scale");
if (value && G_VALUE_HOLDS_DOUBLE (value))
rdtdepay->play_scale = g_value_get_double (value);
else
rdtdepay->play_scale = 1.0;
/* caps seem good, configure element */
rdtdepay->clock_rate = clock_rate;
/* set caps on pad and on header */
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srccaps = gst_caps_new_empty_simple ("application/vnd.rn-realmedia");
gst_pad_set_caps (rdtdepay->srcpad, srccaps);
gst_caps_unref (srccaps);
if (rdtdepay->header)
gst_buffer_unref (rdtdepay->header);
rdtdepay->header = gst_buffer_ref (header);
return TRUE;
/* ERRORS */
no_header:
{
GST_ERROR_OBJECT (rdtdepay, "no header found in caps, no 'config' field");
return FALSE;
}
}
static gboolean
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gst_rdt_depay_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRDTDepay *depay;
gboolean res = TRUE;
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depay = GST_RDT_DEPAY (parent);
switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_rdt_depay_setcaps (pad, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_FLUSH_STOP:
res = gst_pad_push_event (depay->srcpad, event);
gst_segment_init (&depay->segment, GST_FORMAT_UNDEFINED);
depay->need_newsegment = TRUE;
depay->next_seqnum = -1;
break;
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case GST_EVENT_SEGMENT:
{
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gst_event_copy_segment (event, &depay->segment);
/* don't pass the event downstream, we generate our own segment
* including the NTP time and other things we receive in caps */
gst_event_unref (event);
break;
}
default:
/* pass other events forward */
res = gst_pad_push_event (depay->srcpad, event);
break;
}
return res;
}
static GstEvent *
create_segment_event (GstRDTDepay * depay, gboolean update,
GstClockTime position)
{
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GstSegment segment;
gst_segment_init (&segment, GST_FORMAT_TIME);
segment.rate = depay->play_speed;
segment.applied_rate = depay->play_scale;
segment.start = position;
if (depay->npt_stop != -1)
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segment.stop = depay->npt_stop - depay->npt_start;
else
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segment.stop = -1;
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segment.time = position + depay->npt_start;
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return gst_event_new_segment (&segment);
}
static GstFlowReturn
gst_rdt_depay_push (GstRDTDepay * rdtdepay, GstBuffer * buffer)
{
GstFlowReturn ret;
if (rdtdepay->need_newsegment) {
GstEvent *event;
event = create_segment_event (rdtdepay, FALSE, 0);
gst_pad_push_event (rdtdepay->srcpad, event);
rdtdepay->need_newsegment = FALSE;
}
if (rdtdepay->discont) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
rdtdepay->discont = FALSE;
}
ret = gst_pad_push (rdtdepay->srcpad, buffer);
return ret;
}
static GstFlowReturn
gst_rdt_depay_handle_data (GstRDTDepay * rdtdepay, GstClockTime outtime,
GstRDTPacket * packet)
{
GstFlowReturn ret;
GstBuffer *outbuf;
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GstMapInfo outmap;
guint8 *data, *outdata;
guint size;
guint16 stream_id;
guint32 timestamp;
gint gap;
guint16 seqnum;
guint8 flags;
guint16 outflags;
/* get pointers to the packet data */
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data = gst_rdt_packet_data_map (packet, &size);
outbuf = gst_buffer_new_and_alloc (12 + size);
GST_BUFFER_TIMESTAMP (outbuf) = outtime;
GST_DEBUG_OBJECT (rdtdepay, "have size %u", size);
/* copy over some things */
stream_id = gst_rdt_packet_data_get_stream_id (packet);
timestamp = gst_rdt_packet_data_get_timestamp (packet);
flags = gst_rdt_packet_data_get_flags (packet);
seqnum = gst_rdt_packet_data_get_seq (packet);
GST_DEBUG_OBJECT (rdtdepay, "stream_id %u, timestamp %u, seqnum %d, flags %d",
stream_id, timestamp, seqnum, flags);
if (rdtdepay->next_seqnum != -1) {
gap = gst_rdt_buffer_compare_seqnum (seqnum, rdtdepay->next_seqnum);
/* if we have no gap, all is fine */
if (G_UNLIKELY (gap != 0)) {
GST_LOG_OBJECT (rdtdepay, "got packet %u, expected %u, gap %d", seqnum,
rdtdepay->next_seqnum, gap);
if (gap < 0) {
/* seqnum > next_seqnum, we are missing some packets, this is always a
* DISCONT. */
GST_LOG_OBJECT (rdtdepay, "%d missing packets", gap);
rdtdepay->discont = TRUE;
} else {
/* seqnum < next_seqnum, we have seen this packet before or the sender
* could be restarted. If the packet is not too old, we throw it away as
* a duplicate, otherwise we mark discont and continue. 100 misordered
* packets is a good threshold. See also RFC 4737. */
if (gap < 100)
goto dropping;
GST_LOG_OBJECT (rdtdepay,
"%d > 100, packet too old, sender likely restarted", gap);
rdtdepay->discont = TRUE;
}
}
}
rdtdepay->next_seqnum = (seqnum + 1);
if (rdtdepay->next_seqnum == 0xff00)
rdtdepay->next_seqnum = 0;
if ((flags & 1) == 0)
outflags = 2;
else
outflags = 0;
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gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);
outdata = outmap.data;
GST_WRITE_UINT16_BE (outdata + 0, 0); /* version */
GST_WRITE_UINT16_BE (outdata + 2, size + 12); /* length */
GST_WRITE_UINT16_BE (outdata + 4, stream_id); /* stream */
GST_WRITE_UINT32_BE (outdata + 6, timestamp); /* timestamp */
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GST_WRITE_UINT16_BE (outdata + 10, outflags); /* flags */
memcpy (outdata + 12, data, size);
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gst_buffer_unmap (outbuf, &outmap);
gst_buffer_resize (outbuf, 0, 12 + size);
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gst_rdt_packet_data_unmap (packet);
GST_DEBUG_OBJECT (rdtdepay, "Pushing packet, outtime %" GST_TIME_FORMAT,
GST_TIME_ARGS (outtime));
ret = gst_rdt_depay_push (rdtdepay, outbuf);
return ret;
/* ERRORS */
dropping:
{
GST_WARNING_OBJECT (rdtdepay, "%d <= 100, dropping old packet", gap);
return GST_FLOW_OK;
}
}
static GstFlowReturn
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gst_rdt_depay_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstRDTDepay *rdtdepay;
GstFlowReturn ret;
GstClockTime timestamp;
gboolean more;
GstRDTPacket packet;
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rdtdepay = GST_RDT_DEPAY (parent);
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_LOG_OBJECT (rdtdepay, "received discont");
rdtdepay->discont = TRUE;
}
if (rdtdepay->header) {
GstBuffer *out;
out = rdtdepay->header;
rdtdepay->header = NULL;
/* push header data first */
gst_rdt_depay_push (rdtdepay, out);
}
/* save timestamp */
timestamp = GST_BUFFER_TIMESTAMP (buf);
ret = GST_FLOW_OK;
GST_LOG_OBJECT (rdtdepay, "received buffer timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
/* data is in RDT format. */
more = gst_rdt_buffer_get_first_packet (buf, &packet);
while (more) {
GstRDTType type;
type = gst_rdt_packet_get_type (&packet);
GST_DEBUG_OBJECT (rdtdepay, "Have packet of type %04x", type);
if (GST_RDT_IS_DATA_TYPE (type)) {
GST_DEBUG_OBJECT (rdtdepay, "We have a data packet");
ret = gst_rdt_depay_handle_data (rdtdepay, timestamp, &packet);
} else {
switch (type) {
default:
GST_DEBUG_OBJECT (rdtdepay, "Ignoring packet");
break;
}
}
if (ret != GST_FLOW_OK)
break;
more = gst_rdt_packet_move_to_next (&packet);
}
gst_buffer_unref (buf);
return ret;
}
static GstStateChangeReturn
gst_rdt_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRDTDepay *rdtdepay;
GstStateChangeReturn ret;
rdtdepay = GST_RDT_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_segment_init (&rdtdepay->segment, GST_FORMAT_UNDEFINED);
rdtdepay->next_seqnum = -1;
rdtdepay->need_newsegment = TRUE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (rdtdepay->header)
gst_buffer_unref (rdtdepay->header);
rdtdepay->header = NULL;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rdt_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rdtdepay",
GST_RANK_MARGINAL, GST_TYPE_RDT_DEPAY);
}