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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpgstpay.h"
/*
* 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|X|Y|Z| 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
* X: media 1 flag
* Y: media 2 flag
* Z: media 3 flag
*
*
*/
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 gboolean gst_rtp_gst_pay_setcaps (GstBaseRTPPayload * payload,
GstCaps * caps);
static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstBaseRTPPayload * payload,
GstBuffer * buffer);
GST_BOILERPLATE (GstRtpGSTPay, gst_rtp_gst_pay, GstBaseRTPPayload,
GST_TYPE_BASE_RTP_PAYLOAD)
static void gst_rtp_gst_pay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_gst_pay_src_template);
gst_element_class_add_static_pad_template (element_class,
&gst_rtp_gst_pay_sink_template);
gst_element_class_set_details_simple (element_class,
"RTP GStreamer payloader", "Codec/Payloader/Network/RTP",
"Payload GStreamer buffers as RTP packets",
"Wim Taymans <wim.taymans@gmail.com>");
}
static void
gst_rtp_gst_pay_class_init (GstRtpGSTPayClass * klass)
{
GstBaseRTPPayloadClass *gstbasertppayload_class;
gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
gstbasertppayload_class->set_caps = gst_rtp_gst_pay_setcaps;
gstbasertppayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer;
}
static void
gst_rtp_gst_pay_init (GstRtpGSTPay * rtpgstpay, GstRtpGSTPayClass * klass)
{
}
static gboolean
gst_rtp_gst_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
{
gboolean res;
gchar *capsstr, *capsenc;
capsstr = gst_caps_to_string (caps);
capsenc = g_base64_encode ((guchar *) capsstr, strlen (capsstr));
g_free (capsstr);
gst_basertppayload_set_options (payload, "application", TRUE, "X-GST", 90000);
res =
gst_basertppayload_set_outcaps (payload, "caps", G_TYPE_STRING, capsenc,
NULL);
g_free (capsenc);
return res;
}
static GstFlowReturn
gst_rtp_gst_pay_handle_buffer (GstBaseRTPPayload * basepayload,
GstBuffer * buffer)
{
GstRtpGSTPay *rtpgstpay;
guint8 *data;
guint size;
GstBuffer *outbuf;
GstFlowReturn ret;
GstClockTime timestamp;
guint32 frag_offset;
guint flags;
rtpgstpay = GST_RTP_GST_PAY (basepayload);
size = GST_BUFFER_SIZE (buffer);
data = GST_BUFFER_DATA (buffer);
timestamp = GST_BUFFER_TIMESTAMP (buffer);
ret = GST_FLOW_OK;
/* caps always from SDP for now */
flags = 0;
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
flags |= (1 << 3);
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA1))
flags |= (1 << 2);
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA2))
flags |= (1 << 1);
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_MEDIA3))
flags |= (1 << 0);
/*
* 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|X|Y|Z| MBZ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Frag_offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
frag_offset = 0;
while (size > 0) {
guint towrite;
guint8 *payload;
guint payload_len;
guint packet_len;
/* this will be the total lenght of the packet */
packet_len = gst_rtp_buffer_calc_packet_len (8 + size, 0, 0);
/* fill one MTU or all available bytes */
towrite = MIN (packet_len, GST_BASE_RTP_PAYLOAD_MTU (rtpgstpay));
/* this is the payload length */
payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
/* create buffer to hold the payload */
outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
payload = gst_rtp_buffer_get_payload (outbuf);
payload[0] = flags;
payload[1] = 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;
memcpy (payload, data, payload_len);
data += payload_len;
size -= payload_len;
frag_offset += payload_len;
if (size == 0)
gst_rtp_buffer_set_marker (outbuf, TRUE);
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
ret = gst_basertppayload_push (basepayload, outbuf);
}
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gst_buffer_unref (buffer);
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);
}