gstreamer/gst/rtp/gstrtpgstpay.c

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/* GStreamer
* Copyright (C) <2010> 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpgstpay.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_pay_debug);
#define GST_CAT_DEFAULT gst_rtp_pay_debug
/*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| CV |D|0|0|0| ETYPE | MBZ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frag_offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* C: caps inlined flag
* When C set, first part of payload contains caps definition. Caps definition
* starts with variable-length length prefix and then a string of that length.
* the length is encoded in big endian 7 bit chunks, the top 1 bit of a byte
* is the continuation marker and the 7 next bits the data. A continuation
* marker of 1 means that the next byte contains more data.
*
* CV: caps version, 0 = caps from SDP, 1 - 7 inlined caps
* D: delta unit buffer
* ETYPE: type of event. Payload contains the event, prefixed with a
* variable length field.
* 0 = NO event
* 1 = GST_EVENT_TAG
* 2 = GST_EVENT_CUSTOM_DOWNSTREAM
* 3 = GST_EVENT_CUSTOM_BOTH
*/
static GstStaticPadTemplate gst_rtp_gst_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_rtp_gst_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"application\", "
"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"X-GST\"")
);
static void gst_rtp_gst_pay_finalize (GObject * obj);
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static gboolean gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload,
GstCaps * caps);
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static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * payload,
GstBuffer * buffer);
static gboolean gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload,
GstEvent * event);
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#define gst_rtp_gst_pay_parent_class parent_class
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G_DEFINE_TYPE (GstRtpGSTPay, gst_rtp_gst_pay, GST_TYPE_RTP_BASE_PAYLOAD);
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static void
gst_rtp_gst_pay_class_init (GstRtpGSTPayClass * klass)
{
GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBasePayloadClass *gstrtpbasepayload_class;
gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
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gobject_class->finalize = gst_rtp_gst_pay_finalize;
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_gst_pay_src_template));
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_gst_pay_sink_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP GStreamer payloader", "Codec/Payloader/Network/RTP",
"Payload GStreamer buffers as RTP packets",
"Wim Taymans <wim.taymans@gmail.com>");
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gstrtpbasepayload_class->set_caps = gst_rtp_gst_pay_setcaps;
gstrtpbasepayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer;
gstrtpbasepayload_class->sink_event = gst_rtp_gst_pay_sink_event;
GST_DEBUG_CATEGORY_INIT (gst_rtp_pay_debug, "rtpgstpay", 0,
"rtpgstpay element");
}
static void
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gst_rtp_gst_pay_init (GstRtpGSTPay * rtpgstpay)
{
rtpgstpay->adapter = gst_adapter_new ();
gst_rtp_base_payload_set_options (GST_RTP_BASE_PAYLOAD (rtpgstpay),
"application", TRUE, "X-GST", 90000);
}
static void
gst_rtp_gst_pay_finalize (GObject * obj)
{
GstRtpGSTPay *rtpgstpay;
rtpgstpay = GST_RTP_GST_PAY (obj);
g_object_unref (rtpgstpay->adapter);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static GstFlowReturn
gst_rtp_gst_pay_flush (GstRtpGSTPay * rtpgstpay, GstClockTime timestamp)
{
GstFlowReturn ret;
guint avail;
guint frag_offset;
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GstBufferList *list;
frag_offset = 0;
avail = gst_adapter_available (rtpgstpay->adapter);
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if (avail == 0)
return GST_FLOW_OK;
list = gst_buffer_list_new ();
while (avail) {
guint towrite;
guint8 *payload;
guint payload_len;
guint packet_len;
GstBuffer *outbuf;
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GstRTPBuffer rtp = { NULL };
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GstBuffer *paybuf;
/* this will be the total lenght of the packet */
packet_len = gst_rtp_buffer_calc_packet_len (8 + avail, 0, 0);
/* fill one MTU or all available bytes */
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towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpgstpay));
/* this is the payload length */
payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
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/* create buffer to hold the header */
outbuf = gst_rtp_buffer_new_allocate (8, 0, 0);
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gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
GST_DEBUG_OBJECT (rtpgstpay, "new packet len %u, frag %u", packet_len,
frag_offset);
/*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| CV |D|0|0|0| ETYPE | MBZ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frag_offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
payload[0] = rtpgstpay->flags;
payload[1] = rtpgstpay->etype;
payload[2] = payload[3] = 0;
payload[4] = frag_offset >> 24;
payload[5] = frag_offset >> 16;
payload[6] = frag_offset >> 8;
payload[7] = frag_offset & 0xff;
payload += 8;
payload_len -= 8;
frag_offset += payload_len;
avail -= payload_len;
if (avail == 0)
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gst_rtp_buffer_set_marker (&rtp, TRUE);
gst_rtp_buffer_unmap (&rtp);
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/* create a new buf to hold the payload */
GST_DEBUG_OBJECT (rtpgstpay, "take %u bytes from adapter", payload_len);
paybuf = gst_adapter_take_buffer (rtpgstpay->adapter, payload_len);
/* create a new group to hold the rtp header and the payload */
gst_buffer_append (outbuf, paybuf);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
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/* and add to list */
gst_buffer_list_insert (list, -1, outbuf);
}
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/* push the whole buffer list at once */
ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpgstpay), list);
rtpgstpay->flags &= 0x70;
rtpgstpay->etype = 0;
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return ret;
}
static GstBuffer *
make_data_buffer (GstRtpGSTPay * rtpgstpay, gchar * data, guint size)
{
guint plen;
guint8 *ptr;
GstBuffer *outbuf;
GstMapInfo map;
/* calculate length */
plen = 1;
while (size >> (7 * plen))
plen++;
outbuf = gst_buffer_new_allocate (NULL, plen + size, NULL);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
ptr = map.data;
/* write length */
while (plen) {
plen--;
*ptr++ = ((plen > 0) ? 0x80 : 0) | ((size >> (7 * plen)) & 0x7f);
}
/* copy data */
memcpy (ptr, data, size);
gst_buffer_unmap (outbuf, &map);
return outbuf;
}
static gboolean
gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
{
GstRtpGSTPay *rtpgstpay;
gboolean res;
gchar *capsstr, *capsenc, *capsver;
guint capslen;
GstBuffer *outbuf;
rtpgstpay = GST_RTP_GST_PAY (payload);
capsstr = gst_caps_to_string (caps);
capslen = strlen (capsstr);
rtpgstpay->current_CV = rtpgstpay->next_CV;
/* encode without 0 byte */
capsenc = g_base64_encode ((guchar *) capsstr, capslen);
GST_DEBUG_OBJECT (payload, "caps=%s, caps(base64)=%s", capsstr, capsenc);
/* for 0 byte */
capslen++;
/* make a data buffer of it */
outbuf = make_data_buffer (rtpgstpay, capsstr, capslen);
g_free (capsstr);
/* store in adapter, we don't flush yet, buffer might follow */
rtpgstpay->flags = (1 << 7) | (rtpgstpay->current_CV << 4);
rtpgstpay->next_CV = (rtpgstpay->next_CV + 1) & 0x7;
gst_adapter_push (rtpgstpay->adapter, outbuf);
/* make caps for SDP */
capsver = g_strdup_printf ("%d", rtpgstpay->current_CV);
res =
gst_rtp_base_payload_set_outcaps (payload, "caps", G_TYPE_STRING, capsenc,
"capsversion", G_TYPE_STRING, capsver, NULL);
g_free (capsenc);
g_free (capsver);
return res;
}
static gboolean
gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
{
gboolean ret;
GstRtpGSTPay *rtpgstpay;
guint etype;
rtpgstpay = GST_RTP_GST_PAY (payload);
ret =
GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload,
gst_event_ref (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_TAG:
etype = 1;
break;
case GST_EVENT_CUSTOM_DOWNSTREAM:
etype = 2;
break;
case GST_EVENT_CUSTOM_BOTH:
etype = 2;
break;
default:
etype = 0;
GST_LOG_OBJECT (rtpgstpay, "no event for %s",
GST_EVENT_TYPE_NAME (event));
break;
}
if (etype) {
const GstStructure *s;
gchar *estr;
guint elen;
GstBuffer *outbuf;
/* make sure the adapter is flushed */
gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE);
GST_DEBUG_OBJECT (rtpgstpay, "make event type %d for %s",
etype, GST_EVENT_TYPE_NAME (event));
s = gst_event_get_structure (event);
estr = gst_structure_to_string (s);
elen = strlen (estr);
outbuf = make_data_buffer (rtpgstpay, estr, elen);
g_free (estr);
rtpgstpay->etype = etype;
gst_adapter_push (rtpgstpay->adapter, outbuf);
/* flush the adapter immediately */
gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE);
}
gst_event_unref (event);
return ret;
}
static GstFlowReturn
gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * basepayload,
GstBuffer * buffer)
{
GstFlowReturn ret;
GstRtpGSTPay *rtpgstpay;
GstClockTime timestamp;
rtpgstpay = GST_RTP_GST_PAY (basepayload);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
/* caps always from SDP for now */
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
rtpgstpay->flags |= (1 << 3);
gst_adapter_push (rtpgstpay->adapter, buffer);
ret = gst_rtp_gst_pay_flush (rtpgstpay, timestamp);
return ret;
}
gboolean
gst_rtp_gst_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpgstpay",
GST_RANK_NONE, GST_TYPE_RTP_GST_PAY);
}