gstreamer/gst-libs/gst/rtp/gstrtphdrext.c

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/* GStreamer
* Copyright (C) <2012> 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.
*/
/**
* SECTION:gstrtpexthdr
* @short_description: Helper methods for dealing with RTP header extensions
* @see_also: #GstRTPBasePayload, #GstRTPBaseDepayload, gstrtpbuffer
*
* <refsect2>
* <para>
* </para>
* </refsect2>
*/
#include "gstrtphdrext.h"
#include <stdlib.h>
#include <string.h>
/**
* gst_rtp_hdrext_set_ntp_64:
* @data: the data to write to
* @size: the size of @data
* @ntptime: the NTP time
*
* Writes the NTP time in @ntptime to the format required for the NTP-64 header
* extension. @data must hold at least #GST_RTP_HDREXT_NTP_64_SIZE bytes.
*
* Returns: %TRUE on success.
*/
gboolean
gst_rtp_hdrext_set_ntp_64 (gpointer data, guint size, guint64 ntptime)
{
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size >= GST_RTP_HDREXT_NTP_64_SIZE, FALSE);
GST_WRITE_UINT64_BE (data, ntptime);
return TRUE;
}
/**
* gst_rtp_hdrext_get_ntp_64:
* @data: the data to read from
* @size: the size of @data
* @ntptime: the result NTP time
*
* Reads the NTP time from the @size NTP-64 extension bytes in @data and store the
* result in @ntptime.
*
* Returns: %TRUE on success.
*/
gboolean
gst_rtp_hdrext_get_ntp_64 (gpointer data, guint size, guint64 * ntptime)
{
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size >= GST_RTP_HDREXT_NTP_64_SIZE, FALSE);
if (ntptime)
*ntptime = GST_READ_UINT64_BE (data);
return TRUE;
}
/**
* gst_rtp_hdrext_set_ntp_56:
* @data: the data to write to
* @size: the size of @data
* @ntptime: the NTP time
*
* Writes the NTP time in @ntptime to the format required for the NTP-56 header
* extension. @data must hold at least #GST_RTP_HDREXT_NTP_56_SIZE bytes.
*
* Returns: %TRUE on success.
*/
gboolean
gst_rtp_hdrext_set_ntp_56 (gpointer data, guint size, guint64 ntptime)
{
guint8 *d = data;
gint i;
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size >= GST_RTP_HDREXT_NTP_56_SIZE, FALSE);
for (i = 0; i < 7; i++) {
d[6 - i] = ntptime & 0xff;
ntptime >>= 8;
}
return TRUE;
}
/**
* gst_rtp_hdrext_get_ntp_56:
* @data: the data to read from
* @size: the size of @data
* @ntptime: the result NTP time
*
* Reads the NTP time from the @size NTP-56 extension bytes in @data and store the
* result in @ntptime.
*
* Returns: %TRUE on success.
*/
gboolean
gst_rtp_hdrext_get_ntp_56 (gpointer data, guint size, guint64 * ntptime)
{
guint8 *d = data;
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size >= GST_RTP_HDREXT_NTP_56_SIZE, FALSE);
if (ntptime) {
gint i;
*ntptime = 0;
for (i = 0; i < 7; i++) {
*ntptime <<= 8;
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*ntptime |= d[i];
}
}
return TRUE;
}