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gstreamer/gst-libs/gst/rtp/gstrtcpbuffer.c
Stian Selnes 1586981b1b rtcpbuffer: Fix validation of packets with padding 
The padding (if any) is included in the length of the last packet, see
RFC 3550.

Section 6.4.1:
   padding (P): 1 bit
      If the padding bit is set, this individual RTCP packet contains
      some additional padding octets at the end which are not part of
      the control information but are included in the length field. The
      last octet of the padding is a count of how many padding octets
      should be ignored, including itself (it will be a multiple of
      four).

Section A.2:
   *  The padding bit (P) should be zero for the first packet of a
      compound RTCP packet because padding should only be applied, if it
      is needed, to the last packet.

   *  The length fields of the individual RTCP packets must add up to
      the overall length of the compound RTCP packet as received.

https://bugzilla.gnome.org/show_bug.cgi?id=751883
2015-07-06 12:06:47 +03:00

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/* GStreamer
* Copyright (C) <2007> Wim Taymans <wim@fluendo.com>
*
* gstrtcpbuffer.h: various helper functions to manipulate buffers
* with RTCP payload.
*
* 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.
*/
/**
* SECTION:gstrtcpbuffer
* @short_description: Helper methods for dealing with RTCP buffers
* @see_also: #GstRTPBasePayload, #GstRTPBaseDepayload, #gstrtpbuffer
*
* Note: The API in this module is not yet declared stable.
*
* <refsect2>
* <para>
* The GstRTPCBuffer helper functions makes it easy to parse and create regular
* #GstBuffer objects that contain compound RTCP packets. These buffers are typically
* of 'application/x-rtcp' #GstCaps.
* </para>
* <para>
* An RTCP buffer consists of 1 or more #GstRTCPPacket structures that you can
* retrieve with gst_rtcp_buffer_get_first_packet(). #GstRTCPPacket acts as a pointer
* into the RTCP buffer; you can move to the next packet with
* gst_rtcp_packet_move_to_next().
* </para>
* </refsect2>
*/
#include <string.h>
#include "gstrtcpbuffer.h"
/**
* gst_rtcp_buffer_new_take_data:
* @data: (array length=len) (element-type guint8): data for the new buffer
* @len: the length of data
*
* Create a new buffer and set the data and size of the buffer to @data and @len
* respectively. @data will be freed when the buffer is unreffed, so this
* function transfers ownership of @data to the new buffer.
*
* Returns: A newly allocated buffer with @data and of size @len.
*/
GstBuffer *
gst_rtcp_buffer_new_take_data (gpointer data, guint len)
{
GstBuffer *result;
g_return_val_if_fail (data != NULL, NULL);
g_return_val_if_fail (len > 0, NULL);
result = gst_buffer_new_wrapped (data, len);
return result;
}
/**
* gst_rtcp_buffer_new_copy_data:
* @data: (array length=len) (element-type guint8): data for the new buffer
* @len: the length of data
*
* Create a new buffer and set the data to a copy of @len
* bytes of @data and the size to @len. The data will be freed when the buffer
* is freed.
*
* Returns: A newly allocated buffer with a copy of @data and of size @len.
*/
GstBuffer *
gst_rtcp_buffer_new_copy_data (gpointer data, guint len)
{
return gst_rtcp_buffer_new_take_data (g_memdup (data, len), len);
}
static gboolean
gst_rtcp_buffer_validate_data_internal (guint8 * data, guint len,
guint16 valid_mask)
{
guint16 header_mask;
guint header_len;
guint8 version;
guint data_len;
gboolean padding;
guint8 pad_bytes;
g_return_val_if_fail (data != NULL, FALSE);
/* we need 4 bytes for the type and length */
if (G_UNLIKELY (len < 4))
goto wrong_length;
/* first packet must be RR or SR and version must be 2 */
header_mask = ((data[0] << 8) | data[1]) & valid_mask;
if (G_UNLIKELY (header_mask != GST_RTCP_VALID_VALUE))
goto wrong_mask;
/* no padding when mask succeeds */
padding = FALSE;
/* store len */
data_len = len;
while (TRUE) {
/* get packet length */
header_len = (((data[2] << 8) | data[3]) + 1) << 2;
if (data_len < header_len)
goto wrong_length;
/* move to next compount packet */
data += header_len;
data_len -= header_len;
/* we are at the end now */
if (data_len < 4)
break;
/* padding only allowed on last packet */
if (padding)
break;
/* check version of new packet */
version = data[0] & 0xc0;
if (version != (GST_RTCP_VERSION << 6))
goto wrong_version;
/* check padding of new packet */
if (data[0] & 0x20) {
padding = TRUE;
/* last byte of padding contains the number of padded bytes including
* itself. must be a multiple of 4, but cannot be 0. */
pad_bytes = data[data_len - 1];
if (pad_bytes == 0 || (pad_bytes & 0x3))
goto wrong_padding;
}
}
if (data_len != 0) {
/* some leftover bytes */
goto wrong_length;
}
return TRUE;
/* ERRORS */
wrong_length:
{
GST_DEBUG ("len check failed");
return FALSE;
}
wrong_mask:
{
GST_DEBUG ("mask check failed (%04x != %04x)", header_mask, valid_mask);
return FALSE;
}
wrong_version:
{
GST_DEBUG ("wrong version (%d < 2)", version >> 6);
return FALSE;
}
wrong_padding:
{
GST_DEBUG ("padding check failed");
return FALSE;
}
}
/**
* gst_rtcp_buffer_validate_data_reduced:
* @data: (array length=len): the data to validate
* @len: the length of @data to validate
*
* Check if the @data and @size point to the data of a valid RTCP packet.
* Use this function to validate a packet before using the other functions in
* this module.
*
* This function is updated to support reduced size rtcp packets according to
* RFC 5506 and will validate full compound RTCP packets as well as reduced
* size RTCP packets.
*
* Returns: TRUE if the data points to a valid RTCP packet.
*
* Since: 1.6
*/
gboolean
gst_rtcp_buffer_validate_data_reduced (guint8 * data, guint len)
{
return gst_rtcp_buffer_validate_data_internal (data, len,
GST_RTCP_REDUCED_SIZE_VALID_MASK);
}
/**
* gst_rtcp_buffer_validate_data:
* @data: (array length=len): the data to validate
* @len: the length of @data to validate
*
* Check if the @data and @size point to the data of a valid compound,
* non-reduced size RTCP packet.
* Use this function to validate a packet before using the other functions in
* this module.
*
* Returns: TRUE if the data points to a valid RTCP packet.
*/
gboolean
gst_rtcp_buffer_validate_data (guint8 * data, guint len)
{
return gst_rtcp_buffer_validate_data_internal (data, len,
GST_RTCP_VALID_MASK);
}
/**
* gst_rtcp_buffer_validate_reduced:
* @buffer: the buffer to validate
*
* Check if the data pointed to by @buffer is a valid RTCP packet using
* gst_rtcp_buffer_validate_reduced().
*
* Returns: TRUE if @buffer is a valid RTCP packet.
*
* Since: 1.6
*/
gboolean
gst_rtcp_buffer_validate_reduced (GstBuffer * buffer)
{
gboolean res;
GstMapInfo map;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
gst_buffer_map (buffer, &map, GST_MAP_READ);
res = gst_rtcp_buffer_validate_data_reduced (map.data, map.size);
gst_buffer_unmap (buffer, &map);
return res;
}
/**
* gst_rtcp_buffer_validate:
* @buffer: the buffer to validate
*
* Check if the data pointed to by @buffer is a valid RTCP packet using
* gst_rtcp_buffer_validate_data().
*
* Returns: TRUE if @buffer is a valid RTCP packet.
*/
gboolean
gst_rtcp_buffer_validate (GstBuffer * buffer)
{
gboolean res;
GstMapInfo map;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
gst_buffer_map (buffer, &map, GST_MAP_READ);
res = gst_rtcp_buffer_validate_data (map.data, map.size);
gst_buffer_unmap (buffer, &map);
return res;
}
/**
* gst_rtcp_buffer_new:
* @mtu: the maximum mtu size.
*
* Create a new buffer for constructing RTCP packets. The packet will have a
* maximum size of @mtu.
*
* Returns: A newly allocated buffer.
*/
GstBuffer *
gst_rtcp_buffer_new (guint mtu)
{
GstBuffer *result;
guint8 *data;
g_return_val_if_fail (mtu > 0, NULL);
data = g_malloc0 (mtu);
result = gst_buffer_new_wrapped_full (0, data, mtu, 0, 0, data, g_free);
return result;
}
/**
* gst_rtcp_buffer_map:
* @buffer: a buffer with an RTCP packet
* @flags: flags for the mapping
* @rtcp: resulting #GstRTCPBuffer
*
* Open @buffer for reading or writing, depending on @flags. The resulting RTCP
* buffer state is stored in @rtcp.
*/
gboolean
gst_rtcp_buffer_map (GstBuffer * buffer, GstMapFlags flags,
GstRTCPBuffer * rtcp)
{
g_return_val_if_fail (rtcp != NULL, FALSE);
g_return_val_if_fail (rtcp->buffer == NULL, FALSE);
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (flags & GST_MAP_READ, FALSE);
rtcp->buffer = buffer;
gst_buffer_map (buffer, &rtcp->map, flags);
return TRUE;
}
/**
* gst_rtcp_buffer_unmap:
* @rtcp: a buffer with an RTCP packet
*
* Finish @rtcp after being constructed. This function is usually called
* after gst_rtcp_buffer_map() and after adding the RTCP items to the new buffer.
*
* The function adjusts the size of @rtcp with the total length of all the
* added packets.
*/
gboolean
gst_rtcp_buffer_unmap (GstRTCPBuffer * rtcp)
{
g_return_val_if_fail (rtcp != NULL, FALSE);
g_return_val_if_fail (GST_IS_BUFFER (rtcp->buffer), FALSE);
if (rtcp->map.flags & GST_MAP_WRITE) {
/* shrink size */
gst_buffer_resize (rtcp->buffer, 0, rtcp->map.size);
}
gst_buffer_unmap (rtcp->buffer, &rtcp->map);
rtcp->buffer = NULL;
return TRUE;
}
/**
* gst_rtcp_buffer_get_packet_count:
* @rtcp: a valid RTCP buffer
*
* Get the number of RTCP packets in @rtcp.
*
* Returns: the number of RTCP packets in @rtcp.
*/
guint
gst_rtcp_buffer_get_packet_count (GstRTCPBuffer * rtcp)
{
GstRTCPPacket packet;
guint count;
g_return_val_if_fail (rtcp != NULL, 0);
g_return_val_if_fail (GST_IS_BUFFER (rtcp->buffer), 0);
g_return_val_if_fail (rtcp != NULL, 0);
g_return_val_if_fail (rtcp->map.flags & GST_MAP_READ, 0);
count = 0;
if (gst_rtcp_buffer_get_first_packet (rtcp, &packet)) {
do {
count++;
} while (gst_rtcp_packet_move_to_next (&packet));
}
return count;
}
/**
* read_packet_header:
* @packet: a packet
*
* Read the packet headers for the packet pointed to by @packet.
*
* Returns: TRUE if @packet pointed to a valid header.
*/
static gboolean
read_packet_header (GstRTCPPacket * packet)
{
guint8 *data;
gsize maxsize;
guint offset;
g_return_val_if_fail (packet != NULL, FALSE);
data = packet->rtcp->map.data;
maxsize = packet->rtcp->map.size;
offset = packet->offset;
/* check if we are at the end of the buffer, we add 4 because we also want to
* ensure we can read the header. */
if (offset + 4 > maxsize)
return FALSE;
if ((data[offset] & 0xc0) != (GST_RTCP_VERSION << 6))
return FALSE;
/* read count, type and length */
packet->padding = (data[offset] & 0x20) == 0x20;
packet->count = data[offset] & 0x1f;
packet->type = data[offset + 1];
packet->length = (data[offset + 2] << 8) | data[offset + 3];
packet->item_offset = 4;
packet->item_count = 0;
packet->entry_offset = 4;
/* Ensure no overread from the claimed data size. The packet length
is expressed in multiple of 32 bits, to make things obvious. */
if (offset + 4 + packet->length * 4 > maxsize)
return FALSE;
return TRUE;
}
/**
* gst_rtcp_buffer_get_first_packet:
* @rtcp: a valid RTCP buffer
* @packet: a #GstRTCPPacket
*
* Initialize a new #GstRTCPPacket pointer that points to the first packet in
* @rtcp.
*
* Returns: TRUE if the packet existed in @rtcp.
*/
gboolean
gst_rtcp_buffer_get_first_packet (GstRTCPBuffer * rtcp, GstRTCPPacket * packet)
{
g_return_val_if_fail (rtcp != NULL, FALSE);
g_return_val_if_fail (GST_IS_BUFFER (rtcp->buffer), FALSE);
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (rtcp != NULL, 0);
g_return_val_if_fail (rtcp->map.flags & GST_MAP_READ, 0);
/* init to 0 */
packet->rtcp = rtcp;
packet->offset = 0;
packet->type = GST_RTCP_TYPE_INVALID;
if (!read_packet_header (packet))
return FALSE;
return TRUE;
}
/**
* gst_rtcp_packet_move_to_next:
* @packet: a #GstRTCPPacket
*
* Move the packet pointer @packet to the next packet in the payload.
* Use gst_rtcp_buffer_get_first_packet() to initialize @packet.
*
* Returns: TRUE if @packet is pointing to a valid packet after calling this
* function.
*/
gboolean
gst_rtcp_packet_move_to_next (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type != GST_RTCP_TYPE_INVALID, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
/* if we have a padding or invalid packet, it must be the last,
* return FALSE */
if (packet->type == GST_RTCP_TYPE_INVALID || packet->padding)
goto end;
/* move to next packet. Add 4 because the header is not included in length */
packet->offset += (packet->length << 2) + 4;
/* try to read new header */
if (!read_packet_header (packet))
goto end;
return TRUE;
/* ERRORS */
end:
{
packet->type = GST_RTCP_TYPE_INVALID;
return FALSE;
}
}
/**
* gst_rtcp_buffer_add_packet:
* @rtcp: a valid RTCP buffer
* @type: the #GstRTCPType of the new packet
* @packet: pointer to new packet
*
* Add a new packet of @type to @rtcp. @packet will point to the newly created
* packet.
*
* Returns: %TRUE if the packet could be created. This function returns %FALSE
* if the max mtu is exceeded for the buffer.
*/
gboolean
gst_rtcp_buffer_add_packet (GstRTCPBuffer * rtcp, GstRTCPType type,
GstRTCPPacket * packet)
{
guint len;
gsize maxsize;
guint8 *data;
gboolean result;
g_return_val_if_fail (rtcp != NULL, FALSE);
g_return_val_if_fail (GST_IS_BUFFER (rtcp->buffer), FALSE);
g_return_val_if_fail (type != GST_RTCP_TYPE_INVALID, FALSE);
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (rtcp->map.flags & GST_MAP_WRITE, FALSE);
/* find free space */
if (gst_rtcp_buffer_get_first_packet (rtcp, packet))
while (gst_rtcp_packet_move_to_next (packet));
maxsize = rtcp->map.maxsize;
/* packet->offset is now pointing to the next free offset in the buffer to
* start a compount packet. Next we figure out if we have enough free space in
* the buffer to continue. */
switch (type) {
case GST_RTCP_TYPE_SR:
len = 28;
break;
case GST_RTCP_TYPE_RR:
len = 8;
break;
case GST_RTCP_TYPE_SDES:
len = 4;
break;
case GST_RTCP_TYPE_BYE:
len = 4;
break;
case GST_RTCP_TYPE_APP:
len = 12;
break;
case GST_RTCP_TYPE_RTPFB:
len = 12;
break;
case GST_RTCP_TYPE_PSFB:
len = 12;
break;
default:
goto unknown_type;
}
if (packet->offset + len >= maxsize)
goto no_space;
rtcp->map.size += len;
data = rtcp->map.data + packet->offset;
data[0] = (GST_RTCP_VERSION << 6);
data[1] = type;
/* length is stored in multiples of 32 bit words minus the length of the
* header */
len = (len - 4) >> 2;
data[2] = len >> 8;
data[3] = len & 0xff;
/* now try to position to the packet */
result = read_packet_header (packet);
return result;
/* ERRORS */
unknown_type:
{
g_warning ("unknown type %d", type);
return FALSE;
}
no_space:
{
return FALSE;
}
}
/**
* gst_rtcp_packet_remove:
* @packet: a #GstRTCPPacket
*
* Removes the packet pointed to by @packet and moves pointer to the next one
*
* Returns: TRUE if @packet is pointing to a valid packet after calling this
* function.
*/
gboolean
gst_rtcp_packet_remove (GstRTCPPacket * packet)
{
gboolean ret = FALSE;
guint offset = 0;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type != GST_RTCP_TYPE_INVALID, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
/* The next packet starts at offset + length + 4 (the header) */
offset = packet->offset + (packet->length << 2) + 4;
/* Overwrite this packet with the rest of the data */
memmove (packet->rtcp->map.data + packet->offset,
packet->rtcp->map.data + offset, packet->rtcp->map.size - offset);
packet->rtcp->map.size -= offset - packet->offset;
/* try to read next header */
ret = read_packet_header (packet);
if (!ret)
packet->type = GST_RTCP_TYPE_INVALID;
return ret;
}
/**
* gst_rtcp_packet_get_padding:
* @packet: a valid #GstRTCPPacket
*
* Get the packet padding of the packet pointed to by @packet.
*
* Returns: If the packet has the padding bit set.
*/
gboolean
gst_rtcp_packet_get_padding (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type != GST_RTCP_TYPE_INVALID, FALSE);
return packet->padding;
}
/**
* gst_rtcp_packet_get_type:
* @packet: a valid #GstRTCPPacket
*
* Get the packet type of the packet pointed to by @packet.
*
* Returns: The packet type or GST_RTCP_TYPE_INVALID when @packet is not
* pointing to a valid packet.
*/
GstRTCPType
gst_rtcp_packet_get_type (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, GST_RTCP_TYPE_INVALID);
return packet->type;
}
/**
* gst_rtcp_packet_get_count:
* @packet: a valid #GstRTCPPacket
*
* Get the count field in @packet.
*
* Returns: The count field in @packet or -1 if @packet does not point to a
* valid packet.
*/
guint8
gst_rtcp_packet_get_count (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, -1);
g_return_val_if_fail (packet->type != GST_RTCP_TYPE_INVALID, -1);
return packet->count;
}
/**
* gst_rtcp_packet_get_length:
* @packet: a valid #GstRTCPPacket
*
* Get the length field of @packet. This is the length of the packet in
* 32-bit words minus one.
*
* Returns: The length field of @packet.
*/
guint16
gst_rtcp_packet_get_length (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type != GST_RTCP_TYPE_INVALID, 0);
return packet->length;
}
/**
* gst_rtcp_packet_sr_get_sender_info:
* @packet: a valid SR #GstRTCPPacket
* @ssrc: result SSRC
* @ntptime: result NTP time
* @rtptime: result RTP time
* @packet_count: result packet count
* @octet_count: result octet count
*
* Parse the SR sender info and store the values.
*/
void
gst_rtcp_packet_sr_get_sender_info (GstRTCPPacket * packet, guint32 * ssrc,
guint64 * ntptime, guint32 * rtptime, guint32 * packet_count,
guint32 * octet_count)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_SR);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_READ);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
if (ssrc)
*ssrc = GST_READ_UINT32_BE (data);
data += 4;
if (ntptime)
*ntptime = GST_READ_UINT64_BE (data);
data += 8;
if (rtptime)
*rtptime = GST_READ_UINT32_BE (data);
data += 4;
if (packet_count)
*packet_count = GST_READ_UINT32_BE (data);
data += 4;
if (octet_count)
*octet_count = GST_READ_UINT32_BE (data);
}
/**
* gst_rtcp_packet_sr_set_sender_info:
* @packet: a valid SR #GstRTCPPacket
* @ssrc: the SSRC
* @ntptime: the NTP time
* @rtptime: the RTP time
* @packet_count: the packet count
* @octet_count: the octet count
*
* Set the given values in the SR packet @packet.
*/
void
gst_rtcp_packet_sr_set_sender_info (GstRTCPPacket * packet, guint32 ssrc,
guint64 ntptime, guint32 rtptime, guint32 packet_count, guint32 octet_count)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_SR);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
GST_WRITE_UINT32_BE (data, ssrc);
data += 4;
GST_WRITE_UINT64_BE (data, ntptime);
data += 8;
GST_WRITE_UINT32_BE (data, rtptime);
data += 4;
GST_WRITE_UINT32_BE (data, packet_count);
data += 4;
GST_WRITE_UINT32_BE (data, octet_count);
}
/**
* gst_rtcp_packet_rr_get_ssrc:
* @packet: a valid RR #GstRTCPPacket
*
* Get the ssrc field of the RR @packet.
*
* Returns: the ssrc.
*/
guint32
gst_rtcp_packet_rr_get_ssrc (GstRTCPPacket * packet)
{
guint8 *data;
guint32 ssrc;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RR, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
ssrc = GST_READ_UINT32_BE (data);
return ssrc;
}
/**
* gst_rtcp_packet_rr_set_ssrc:
* @packet: a valid RR #GstRTCPPacket
* @ssrc: the SSRC to set
*
* Set the ssrc field of the RR @packet.
*/
void
gst_rtcp_packet_rr_set_ssrc (GstRTCPPacket * packet, guint32 ssrc)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RR);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
GST_WRITE_UINT32_BE (data, ssrc);
}
/**
* gst_rtcp_packet_get_rb_count:
* @packet: a valid SR or RR #GstRTCPPacket
*
* Get the number of report blocks in @packet.
*
* Returns: The number of report blocks in @packet.
*/
guint
gst_rtcp_packet_get_rb_count (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RR ||
packet->type == GST_RTCP_TYPE_SR, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
return packet->count;
}
/**
* gst_rtcp_packet_get_rb:
* @packet: a valid SR or RR #GstRTCPPacket
* @nth: the nth report block in @packet
* @ssrc: result for data source being reported
* @fractionlost: result for fraction lost since last SR/RR
* @packetslost: result for the cumululative number of packets lost
* @exthighestseq: result for the extended last sequence number received
* @jitter: result for the interarrival jitter
* @lsr: result for the last SR packet from this source
* @dlsr: result for the delay since last SR packet
*
* Parse the values of the @nth report block in @packet and store the result in
* the values.
*/
void
gst_rtcp_packet_get_rb (GstRTCPPacket * packet, guint nth, guint32 * ssrc,
guint8 * fractionlost, gint32 * packetslost, guint32 * exthighestseq,
guint32 * jitter, guint32 * lsr, guint32 * dlsr)
{
guint offset;
guint8 *data;
guint32 tmp;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RR ||
packet->type == GST_RTCP_TYPE_SR);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_READ);
g_return_if_fail (nth < packet->count);
/* get offset in 32-bits words into packet, skip the header */
if (packet->type == GST_RTCP_TYPE_RR)
offset = 2;
else
offset = 7;
/* move to requested index */
offset += (nth * 6);
/* check that we don't go past the packet length */
if (offset > packet->length)
return;
/* scale to bytes */
offset <<= 2;
offset += packet->offset;
/* check if the packet is valid */
if (offset + 24 > packet->rtcp->map.size)
return;
data = packet->rtcp->map.data;
data += offset;
if (ssrc)
*ssrc = GST_READ_UINT32_BE (data);
data += 4;
tmp = GST_READ_UINT32_BE (data);
if (fractionlost)
*fractionlost = (tmp >> 24);
if (packetslost) {
/* sign extend */
if (tmp & 0x00800000)
tmp |= 0xff000000;
else
tmp &= 0x00ffffff;
*packetslost = (gint32) tmp;
}
data += 4;
if (exthighestseq)
*exthighestseq = GST_READ_UINT32_BE (data);
data += 4;
if (jitter)
*jitter = GST_READ_UINT32_BE (data);
data += 4;
if (lsr)
*lsr = GST_READ_UINT32_BE (data);
data += 4;
if (dlsr)
*dlsr = GST_READ_UINT32_BE (data);
}
/**
* gst_rtcp_packet_add_rb:
* @packet: a valid SR or RR #GstRTCPPacket
* @ssrc: data source being reported
* @fractionlost: fraction lost since last SR/RR
* @packetslost: the cumululative number of packets lost
* @exthighestseq: the extended last sequence number received
* @jitter: the interarrival jitter
* @lsr: the last SR packet from this source
* @dlsr: the delay since last SR packet
*
* Add a new report block to @packet with the given values.
*
* Returns: %TRUE if the packet was created. This function can return %FALSE if
* the max MTU is exceeded or the number of report blocks is greater than
* #GST_RTCP_MAX_RB_COUNT.
*/
gboolean
gst_rtcp_packet_add_rb (GstRTCPPacket * packet, guint32 ssrc,
guint8 fractionlost, gint32 packetslost, guint32 exthighestseq,
guint32 jitter, guint32 lsr, guint32 dlsr)
{
guint8 *data;
guint maxsize, offset;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RR ||
packet->type == GST_RTCP_TYPE_SR, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
if (packet->count >= GST_RTCP_MAX_RB_COUNT)
goto no_space;
data = packet->rtcp->map.data;
maxsize = packet->rtcp->map.maxsize;
/* skip header */
offset = packet->offset + 4;
if (packet->type == GST_RTCP_TYPE_RR)
offset += 4;
else
offset += 24;
/* move to current index */
offset += (packet->count * 24);
/* we need 24 free bytes now */
if (offset + 24 >= maxsize)
goto no_space;
/* increment packet count and length */
packet->count++;
data[packet->offset]++;
packet->length += 6;
data[packet->offset + 2] = (packet->length) >> 8;
data[packet->offset + 3] = (packet->length) & 0xff;
packet->rtcp->map.size += 6 * 4;
/* move to new report block offset */
data += offset;
GST_WRITE_UINT32_BE (data, ssrc);
data += 4;
GST_WRITE_UINT32_BE (data, (fractionlost << 24) | (packetslost & 0xffffff));
data += 4;
GST_WRITE_UINT32_BE (data, exthighestseq);
data += 4;
GST_WRITE_UINT32_BE (data, jitter);
data += 4;
GST_WRITE_UINT32_BE (data, lsr);
data += 4;
GST_WRITE_UINT32_BE (data, dlsr);
return TRUE;
no_space:
{
return FALSE;
}
}
/**
* gst_rtcp_packet_set_rb:
* @packet: a valid SR or RR #GstRTCPPacket
* @nth: the nth report block to set
* @ssrc: data source being reported
* @fractionlost: fraction lost since last SR/RR
* @packetslost: the cumululative number of packets lost
* @exthighestseq: the extended last sequence number received
* @jitter: the interarrival jitter
* @lsr: the last SR packet from this source
* @dlsr: the delay since last SR packet
*
* Set the @nth new report block in @packet with the given values.
*
* Note: Not implemented.
*/
void
gst_rtcp_packet_set_rb (GstRTCPPacket * packet, guint nth, guint32 ssrc,
guint8 fractionlost, gint32 packetslost, guint32 exthighestseq,
guint32 jitter, guint32 lsr, guint32 dlsr)
{
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RR ||
packet->type == GST_RTCP_TYPE_SR);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE);
g_warning ("not implemented");
}
/**
* gst_rtcp_packet_sdes_get_item_count:
* @packet: a valid SDES #GstRTCPPacket
*
* Get the number of items in the SDES packet @packet.
*
* Returns: The number of items in @packet.
*/
guint
gst_rtcp_packet_sdes_get_item_count (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, 0);
return packet->count;
}
/**
* gst_rtcp_packet_sdes_first_item:
* @packet: a valid SDES #GstRTCPPacket
*
* Move to the first SDES item in @packet.
*
* Returns: TRUE if there was a first item.
*/
gboolean
gst_rtcp_packet_sdes_first_item (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
packet->item_offset = 4;
packet->item_count = 0;
packet->entry_offset = 4;
if (packet->count == 0)
return FALSE;
return TRUE;
}
/**
* gst_rtcp_packet_sdes_next_item:
* @packet: a valid SDES #GstRTCPPacket
*
* Move to the next SDES item in @packet.
*
* Returns: TRUE if there was a next item.
*/
gboolean
gst_rtcp_packet_sdes_next_item (GstRTCPPacket * packet)
{
guint8 *data;
guint offset;
guint len;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
/* if we are at the last item, we are done */
if (packet->item_count == packet->count)
return FALSE;
/* move to SDES */
data = packet->rtcp->map.data;
data += packet->offset;
/* move to item */
offset = packet->item_offset;
/* skip SSRC */
offset += 4;
/* don't overrun */
len = (packet->length << 2);
while (offset < len) {
if (data[offset] == 0) {
/* end of list, round to next 32-bit word */
offset = (offset + 4) & ~3;
break;
}
offset += data[offset + 1] + 2;
}
if (offset >= len)
return FALSE;
packet->item_offset = offset;
packet->item_count++;
packet->entry_offset = 4;
return TRUE;
}
/**
* gst_rtcp_packet_sdes_get_ssrc:
* @packet: a valid SDES #GstRTCPPacket
*
* Get the SSRC of the current SDES item.
*
* Returns: the SSRC of the current item.
*/
guint32
gst_rtcp_packet_sdes_get_ssrc (GstRTCPPacket * packet)
{
guint32 ssrc;
guint8 *data;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
/* move to SDES */
data = packet->rtcp->map.data;
data += packet->offset;
/* move to item */
data += packet->item_offset;
ssrc = GST_READ_UINT32_BE (data);
return ssrc;
}
/**
* gst_rtcp_packet_sdes_first_entry:
* @packet: a valid SDES #GstRTCPPacket
*
* Move to the first SDES entry in the current item.
*
* Returns: %TRUE if there was a first entry.
*/
gboolean
gst_rtcp_packet_sdes_first_entry (GstRTCPPacket * packet)
{
guint8 *data;
guint len, offset;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
/* move to SDES */
data = packet->rtcp->map.data;
data += packet->offset;
/* move to item */
offset = packet->item_offset;
/* skip SSRC */
offset += 4;
packet->entry_offset = 4;
/* don't overrun */
len = (packet->length << 2);
if (offset >= len)
return FALSE;
if (data[offset] == 0)
return FALSE;
return TRUE;
}
/**
* gst_rtcp_packet_sdes_next_entry:
* @packet: a valid SDES #GstRTCPPacket
*
* Move to the next SDES entry in the current item.
*
* Returns: %TRUE if there was a next entry.
*/
gboolean
gst_rtcp_packet_sdes_next_entry (GstRTCPPacket * packet)
{
guint8 *data;
guint len, offset, item_len;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
/* move to SDES */
data = packet->rtcp->map.data;
data += packet->offset;
/* move to item */
offset = packet->item_offset;
/* move to entry */
offset += packet->entry_offset;
item_len = data[offset + 1] + 2;
/* skip item */
offset += item_len;
/* don't overrun */
len = (packet->length << 2);
if (offset >= len)
return FALSE;
packet->entry_offset += item_len;
/* check for end of list */
if (data[offset] == 0)
return FALSE;
return TRUE;
}
/**
* gst_rtcp_packet_sdes_get_entry:
* @packet: a valid SDES #GstRTCPPacket
* @type: result of the entry type
* @len: (out): result length of the entry data
* @data: (out) (array length=len) (transfer none): result entry data
*
* Get the data of the current SDES item entry. @type (when not NULL) will
* contain the type of the entry. @data (when not NULL) will point to @len
* bytes.
*
* When @type refers to a text item, @data will point to a UTF8 string. Note
* that this UTF8 string is NOT null-terminated. Use
* gst_rtcp_packet_sdes_copy_entry() to get a null-terminated copy of the entry.
*
* Returns: %TRUE if there was valid data.
*/
gboolean
gst_rtcp_packet_sdes_get_entry (GstRTCPPacket * packet,
GstRTCPSDESType * type, guint8 * len, guint8 ** data)
{
guint8 *bdata;
guint offset;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
/* move to SDES */
bdata = packet->rtcp->map.data;
bdata += packet->offset;
/* move to item */
offset = packet->item_offset;
/* move to entry */
offset += packet->entry_offset;
if (bdata[offset] == 0)
return FALSE;
if (type)
*type = bdata[offset];
if (len)
*len = bdata[offset + 1];
if (data)
*data = &bdata[offset + 2];
return TRUE;
}
/**
* gst_rtcp_packet_sdes_copy_entry:
* @packet: a valid SDES #GstRTCPPacket
* @type: result of the entry type
* @len: (out): result length of the entry data
* @data: (out) (array length=len): result entry data
*
* This function is like gst_rtcp_packet_sdes_get_entry() but it returns a
* null-terminated copy of the data instead. use g_free() after usage.
*
* Returns: %TRUE if there was valid data.
*/
gboolean
gst_rtcp_packet_sdes_copy_entry (GstRTCPPacket * packet,
GstRTCPSDESType * type, guint8 * len, guint8 ** data)
{
guint8 *tdata;
guint8 tlen;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, FALSE);
if (!gst_rtcp_packet_sdes_get_entry (packet, type, &tlen, &tdata))
return FALSE;
if (len)
*len = tlen;
if (data)
*data = (guint8 *) g_strndup ((gchar *) tdata, tlen);
return TRUE;
}
/**
* gst_rtcp_packet_sdes_add_item:
* @packet: a valid SDES #GstRTCPPacket
* @ssrc: the SSRC of the new item to add
*
* Add a new SDES item for @ssrc to @packet.
*
* Returns: %TRUE if the item could be added, %FALSE if the maximum amount of
* items has been exceeded for the SDES packet or the MTU has been reached.
*/
gboolean
gst_rtcp_packet_sdes_add_item (GstRTCPPacket * packet, guint32 ssrc)
{
guint8 *data;
guint offset;
gsize maxsize;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
/* increment item count when possible */
if (packet->count >= GST_RTCP_MAX_SDES_ITEM_COUNT)
goto no_space;
/* pretend there is a next packet for the next call */
packet->count++;
/* jump over current item */
gst_rtcp_packet_sdes_next_item (packet);
/* move to SDES */
data = packet->rtcp->map.data;
maxsize = packet->rtcp->map.maxsize;
data += packet->offset;
/* move to current item */
offset = packet->item_offset;
/* we need 2 free words now */
if (offset + 8 >= maxsize)
goto no_next;
/* write SSRC */
GST_WRITE_UINT32_BE (&data[offset], ssrc);
/* write 0 entry with padding */
GST_WRITE_UINT32_BE (&data[offset + 4], 0);
/* update count */
data[0] = (data[0] & 0xe0) | packet->count;
/* update length, we added 2 words */
packet->length += 2;
data[2] = (packet->length) >> 8;
data[3] = (packet->length) & 0xff;
packet->rtcp->map.size += 8;
return TRUE;
/* ERRORS */
no_space:
{
return FALSE;
}
no_next:
{
packet->count--;
return FALSE;
}
}
/**
* gst_rtcp_packet_sdes_add_entry:
* @packet: a valid SDES #GstRTCPPacket
* @type: the #GstRTCPSDESType of the SDES entry
* @len: the data length
* @data: (array length=len): the data
*
* Add a new SDES entry to the current item in @packet.
*
* Returns: %TRUE if the item could be added, %FALSE if the MTU has been
* reached.
*/
gboolean
gst_rtcp_packet_sdes_add_entry (GstRTCPPacket * packet, GstRTCPSDESType type,
guint8 len, const guint8 * data)
{
guint8 *bdata;
guint offset, padded;
gsize maxsize;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_SDES, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
/* move to SDES */
bdata = packet->rtcp->map.data;
maxsize = packet->rtcp->map.maxsize;
bdata += packet->offset;
/* move to item */
offset = packet->item_offset;
/* move to entry */
offset += packet->entry_offset;
/* add 1 byte end and up to 3 bytes padding to fill a full 32 bit word */
padded = (offset + 2 + len + 1 + 3) & ~3;
/* we need enough space for type, len, data and padding */
if (packet->offset + padded >= maxsize)
goto no_space;
packet->rtcp->map.size = packet->offset + padded;
bdata[offset] = type;
bdata[offset + 1] = len;
memcpy (&bdata[offset + 2], data, len);
bdata[offset + 2 + len] = 0;
/* calculate new packet length */
packet->length = (padded - 4) >> 2;
bdata[2] = (packet->length) >> 8;
bdata[3] = (packet->length) & 0xff;
/* position to new next entry */
packet->entry_offset += 2 + len;
return TRUE;
/* ERRORS */
no_space:
{
return FALSE;
}
}
/**
* gst_rtcp_packet_bye_get_ssrc_count:
* @packet: a valid BYE #GstRTCPPacket
*
* Get the number of SSRC fields in @packet.
*
* Returns: The number of SSRC fields in @packet.
*/
guint
gst_rtcp_packet_bye_get_ssrc_count (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, -1);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, -1);
return packet->count;
}
/**
* gst_rtcp_packet_bye_get_nth_ssrc:
* @packet: a valid BYE #GstRTCPPacket
* @nth: the nth SSRC to get
*
* Get the @nth SSRC of the BYE @packet.
*
* Returns: The @nth SSRC of @packet.
*/
guint32
gst_rtcp_packet_bye_get_nth_ssrc (GstRTCPPacket * packet, guint nth)
{
guint8 *data;
guint offset;
guint32 ssrc;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
g_return_val_if_fail (nth < packet->count, 0);
/* get offset in 32-bits words into packet, skip the header */
offset = 1 + nth;
/* check that we don't go past the packet length */
if (offset > packet->length)
return 0;
/* scale to bytes */
offset <<= 2;
offset += packet->offset;
/* check if the packet is valid */
if (offset + 4 > packet->rtcp->map.size)
return 0;
data = packet->rtcp->map.data;
data += offset;
ssrc = GST_READ_UINT32_BE (data);
return ssrc;
}
/**
* gst_rtcp_packet_bye_add_ssrc:
* @packet: a valid BYE #GstRTCPPacket
* @ssrc: an SSRC to add
*
* Add @ssrc to the BYE @packet.
*
* Returns: %TRUE if the ssrc was added. This function can return %FALSE if
* the max MTU is exceeded or the number of sources blocks is greater than
* #GST_RTCP_MAX_BYE_SSRC_COUNT.
*/
gboolean
gst_rtcp_packet_bye_add_ssrc (GstRTCPPacket * packet, guint32 ssrc)
{
guint8 *data;
gsize maxsize;
guint offset;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
if (packet->count >= GST_RTCP_MAX_BYE_SSRC_COUNT)
goto no_space;
data = packet->rtcp->map.data;
maxsize = packet->rtcp->map.maxsize;
/* skip header */
offset = packet->offset + 4;
/* move to current index */
offset += (packet->count * 4);
if (offset + 4 >= maxsize)
goto no_space;
/* increment packet count and length */
packet->count++;
data[packet->offset]++;
packet->length += 1;
data[packet->offset + 2] = (packet->length) >> 8;
data[packet->offset + 3] = (packet->length) & 0xff;
packet->rtcp->map.size += 4;
/* move to new SSRC offset and write ssrc */
data += offset;
GST_WRITE_UINT32_BE (data, ssrc);
return TRUE;
/* ERRORS */
no_space:
{
return FALSE;
}
}
/**
* gst_rtcp_packet_bye_add_ssrcs:
* @packet: a valid BYE #GstRTCPPacket
* @ssrc: an array of SSRCs to add
* @len: number of elements in @ssrc
*
* Adds @len SSRCs in @ssrc to BYE @packet.
*
* Returns: %TRUE if the all the SSRCs were added. This function can return %FALSE if
* the max MTU is exceeded or the number of sources blocks is greater than
* #GST_RTCP_MAX_BYE_SSRC_COUNT.
*/
gboolean
gst_rtcp_packet_bye_add_ssrcs (GstRTCPPacket * packet, guint32 * ssrc,
guint len)
{
guint i;
gboolean res;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
res = TRUE;
for (i = 0; i < len && res; i++) {
res = gst_rtcp_packet_bye_add_ssrc (packet, ssrc[i]);
}
return res;
}
/* get the offset in packet of the reason length */
static guint
get_reason_offset (GstRTCPPacket * packet)
{
guint offset;
/* get amount of sources plus header */
offset = 1 + packet->count;
/* check that we don't go past the packet length */
if (offset > packet->length)
return 0;
/* scale to bytes */
offset <<= 2;
offset += packet->offset;
/* check if the packet is valid */
if (offset + 1 > packet->rtcp->map.size)
return 0;
return offset;
}
/**
* gst_rtcp_packet_bye_get_reason_len:
* @packet: a valid BYE #GstRTCPPacket
*
* Get the length of the reason string.
*
* Returns: The length of the reason string or 0 when there is no reason string
* present.
*/
guint8
gst_rtcp_packet_bye_get_reason_len (GstRTCPPacket * packet)
{
guint8 *data;
guint roffset;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
roffset = get_reason_offset (packet);
if (roffset == 0)
return 0;
data = packet->rtcp->map.data;
return data[roffset];
}
/**
* gst_rtcp_packet_bye_get_reason:
* @packet: a valid BYE #GstRTCPPacket
*
* Get the reason in @packet.
*
* Returns: The reason for the BYE @packet or NULL if the packet did not contain
* a reason string. The string must be freed with g_free() after usage.
*/
gchar *
gst_rtcp_packet_bye_get_reason (GstRTCPPacket * packet)
{
guint8 *data;
guint roffset;
guint8 len;
g_return_val_if_fail (packet != NULL, NULL);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, NULL);
g_return_val_if_fail (packet->rtcp != NULL, NULL);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, NULL);
roffset = get_reason_offset (packet);
if (roffset == 0)
return NULL;
data = packet->rtcp->map.data;
/* get length of reason string */
len = data[roffset];
if (len == 0)
return NULL;
/* move to string */
roffset += 1;
/* check if enough data to copy */
if (roffset + len > packet->rtcp->map.size)
return NULL;
return g_strndup ((gconstpointer) (data + roffset), len);
}
/**
* gst_rtcp_packet_bye_set_reason:
* @packet: a valid BYE #GstRTCPPacket
* @reason: a reason string
*
* Set the reason string to @reason in @packet.
*
* Returns: TRUE if the string could be set.
*/
gboolean
gst_rtcp_packet_bye_set_reason (GstRTCPPacket * packet, const gchar * reason)
{
guint8 *data;
guint roffset;
gsize maxsize;
guint8 len, padded;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_BYE, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
if (reason == NULL)
return TRUE;
len = strlen (reason);
if (len == 0)
return TRUE;
/* make room for the string before we get the offset */
packet->length++;
roffset = get_reason_offset (packet);
if (roffset == 0)
goto no_space;
data = packet->rtcp->map.data;
maxsize = packet->rtcp->map.maxsize;
/* we have 1 byte length and we need to pad to 4 bytes */
padded = ((len + 1) + 3) & ~3;
/* we need enough space for the padded length */
if (roffset + padded >= maxsize)
goto no_space;
data[roffset] = len;
memcpy (&data[roffset + 1], reason, len);
/* update packet length, we made room for 1 double word already */
packet->length += (padded >> 2) - 1;
data[packet->offset + 2] = (packet->length) >> 8;
data[packet->offset + 3] = (packet->length) & 0xff;
packet->rtcp->map.size += padded;
return TRUE;
/* ERRORS */
no_space:
{
packet->length--;
return FALSE;
}
}
/**
* gst_rtcp_packet_fb_get_sender_ssrc:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
*
* Get the sender SSRC field of the RTPFB or PSFB @packet.
*
* Returns: the sender SSRC.
*/
guint32
gst_rtcp_packet_fb_get_sender_ssrc (GstRTCPPacket * packet)
{
guint8 *data;
guint32 ssrc;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail ((packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB), 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
ssrc = GST_READ_UINT32_BE (data);
return ssrc;
}
/**
* gst_rtcp_packet_fb_set_sender_ssrc:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
* @ssrc: a sender SSRC
*
* Set the sender SSRC field of the RTPFB or PSFB @packet.
*/
void
gst_rtcp_packet_fb_set_sender_ssrc (GstRTCPPacket * packet, guint32 ssrc)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_READ);
data = packet->rtcp->map.data;
/* skip header */
data += packet->offset + 4;
GST_WRITE_UINT32_BE (data, ssrc);
}
/**
* gst_rtcp_packet_fb_get_media_ssrc:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
*
* Get the media SSRC field of the RTPFB or PSFB @packet.
*
* Returns: the media SSRC.
*/
guint32
gst_rtcp_packet_fb_get_media_ssrc (GstRTCPPacket * packet)
{
guint8 *data;
guint32 ssrc;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail ((packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB), 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
data = packet->rtcp->map.data;
/* skip header and sender ssrc */
data += packet->offset + 8;
ssrc = GST_READ_UINT32_BE (data);
return ssrc;
}
/**
* gst_rtcp_packet_fb_set_media_ssrc:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
* @ssrc: a media SSRC
*
* Set the media SSRC field of the RTPFB or PSFB @packet.
*/
void
gst_rtcp_packet_fb_set_media_ssrc (GstRTCPPacket * packet, guint32 ssrc)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE);
data = packet->rtcp->map.data;
/* skip header and sender ssrc */
data += packet->offset + 8;
GST_WRITE_UINT32_BE (data, ssrc);
}
/**
* gst_rtcp_packet_fb_get_type:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
*
* Get the feedback message type of the FB @packet.
*
* Returns: The feedback message type.
*/
GstRTCPFBType
gst_rtcp_packet_fb_get_type (GstRTCPPacket * packet)
{
g_return_val_if_fail (packet != NULL, GST_RTCP_FB_TYPE_INVALID);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB, GST_RTCP_FB_TYPE_INVALID);
return packet->count;
}
/**
* gst_rtcp_packet_fb_set_type:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
* @type: the #GstRTCPFBType to set
*
* Set the feedback message type of the FB @packet.
*/
void
gst_rtcp_packet_fb_set_type (GstRTCPPacket * packet, GstRTCPFBType type)
{
guint8 *data;
g_return_if_fail (packet != NULL);
g_return_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB);
g_return_if_fail (packet->rtcp != NULL);
g_return_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE);
data = packet->rtcp->map.data;
data[packet->offset] = (data[packet->offset] & 0xe0) | type;
packet->count = type;
}
/**
* gst_rtcp_ntp_to_unix:
* @ntptime: an NTP timestamp
*
* Converts an NTP time to UNIX nanoseconds. @ntptime can typically be
* the NTP time of an SR RTCP message and contains, in the upper 32 bits, the
* number of seconds since 1900 and, in the lower 32 bits, the fractional
* seconds. The resulting value will be the number of nanoseconds since 1970.
*
* Returns: the UNIX time for @ntptime in nanoseconds.
*/
guint64
gst_rtcp_ntp_to_unix (guint64 ntptime)
{
guint64 unixtime;
/* conversion from NTP timestamp (seconds since 1900) to seconds since
* 1970. */
unixtime = ntptime - (G_GUINT64_CONSTANT (2208988800) << 32);
/* conversion to nanoseconds */
unixtime =
gst_util_uint64_scale (unixtime, GST_SECOND,
(G_GINT64_CONSTANT (1) << 32));
return unixtime;
}
/**
* gst_rtcp_unix_to_ntp:
* @unixtime: an UNIX timestamp in nanoseconds
*
* Converts a UNIX timestamp in nanoseconds to an NTP time. The caller should
* pass a value with nanoseconds since 1970. The NTP time will, in the upper
* 32 bits, contain the number of seconds since 1900 and, in the lower 32
* bits, the fractional seconds. The resulting value can be used as an ntptime
* for constructing SR RTCP packets.
*
* Returns: the NTP time for @unixtime.
*/
guint64
gst_rtcp_unix_to_ntp (guint64 unixtime)
{
guint64 ntptime;
/* convert clock time to NTP time. upper 32 bits should contain the seconds
* and the lower 32 bits, the fractions of a second. */
ntptime =
gst_util_uint64_scale (unixtime, (G_GINT64_CONSTANT (1) << 32),
GST_SECOND);
/* conversion from UNIX timestamp (seconds since 1970) to NTP (seconds
* since 1900). */
ntptime += (G_GUINT64_CONSTANT (2208988800) << 32);
return ntptime;
}
/**
* gst_rtcp_sdes_type_to_name:
* @type: a #GstRTCPSDESType
*
* Converts @type to the string equivalent. The string is typically used as a
* key in a #GstStructure containing SDES items.
*
* Returns: the string equivalent of @type
*/
const gchar *
gst_rtcp_sdes_type_to_name (GstRTCPSDESType type)
{
const gchar *result;
switch (type) {
case GST_RTCP_SDES_CNAME:
result = "cname";
break;
case GST_RTCP_SDES_NAME:
result = "name";
break;
case GST_RTCP_SDES_EMAIL:
result = "email";
break;
case GST_RTCP_SDES_PHONE:
result = "phone";
break;
case GST_RTCP_SDES_LOC:
result = "location";
break;
case GST_RTCP_SDES_TOOL:
result = "tool";
break;
case GST_RTCP_SDES_NOTE:
result = "note";
break;
case GST_RTCP_SDES_PRIV:
result = "priv";
break;
default:
result = NULL;
break;
}
return result;
}
/**
* gst_rtcp_sdes_name_to_type:
* @name: a SDES name
*
* Convert @name into a @GstRTCPSDESType. @name is typically a key in a
* #GstStructure containing SDES items.
*
* Returns: the #GstRTCPSDESType for @name or #GST_RTCP_SDES_PRIV when @name
* is a private sdes item.
*/
GstRTCPSDESType
gst_rtcp_sdes_name_to_type (const gchar * name)
{
if (name == NULL || strlen (name) == 0)
return GST_RTCP_SDES_INVALID;
if (strcmp ("cname", name) == 0)
return GST_RTCP_SDES_CNAME;
if (strcmp ("name", name) == 0)
return GST_RTCP_SDES_NAME;
if (strcmp ("email", name) == 0)
return GST_RTCP_SDES_EMAIL;
if (strcmp ("phone", name) == 0)
return GST_RTCP_SDES_PHONE;
if (strcmp ("location", name) == 0)
return GST_RTCP_SDES_LOC;
if (strcmp ("tool", name) == 0)
return GST_RTCP_SDES_TOOL;
if (strcmp ("note", name) == 0)
return GST_RTCP_SDES_NOTE;
return GST_RTCP_SDES_PRIV;
}
/**
* gst_rtcp_packet_fb_get_fci_length:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
*
* Get the length of the Feedback Control Information attached to a
* RTPFB or PSFB @packet.
*
* Returns: The length of the FCI in 32-bit words.
*/
guint16
gst_rtcp_packet_fb_get_fci_length (GstRTCPPacket * packet)
{
guint8 *data;
g_return_val_if_fail (packet != NULL, 0);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB, 0);
g_return_val_if_fail (packet->rtcp != NULL, 0);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, 0);
data = packet->rtcp->map.data + packet->offset + 2;
return GST_READ_UINT16_BE (data) - 2;
}
/**
* gst_rtcp_packet_fb_set_fci_length:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
* @wordlen: Length of the FCI in 32-bit words
*
* Set the length of the Feedback Control Information attached to a
* RTPFB or PSFB @packet.
*
* Returns: %TRUE if there was enough space in the packet to add this much FCI
*/
gboolean
gst_rtcp_packet_fb_set_fci_length (GstRTCPPacket * packet, guint16 wordlen)
{
guint8 *data;
g_return_val_if_fail (packet != NULL, FALSE);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB, FALSE);
g_return_val_if_fail (packet->rtcp != NULL, FALSE);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_WRITE, FALSE);
if (packet->rtcp->map.maxsize < packet->offset + ((wordlen + 3) * 4))
return FALSE;
data = packet->rtcp->map.data + packet->offset + 2;
wordlen += 2;
GST_WRITE_UINT16_BE (data, wordlen);
packet->rtcp->map.size = packet->offset + ((wordlen + 1) * 4);
return TRUE;
}
/**
* gst_rtcp_packet_fb_get_fci:
* @packet: a valid RTPFB or PSFB #GstRTCPPacket
*
* Get the Feedback Control Information attached to a RTPFB or PSFB @packet.
*
* Returns: a pointer to the FCI
*/
guint8 *
gst_rtcp_packet_fb_get_fci (GstRTCPPacket * packet)
{
guint8 *data;
g_return_val_if_fail (packet != NULL, NULL);
g_return_val_if_fail (packet->type == GST_RTCP_TYPE_RTPFB ||
packet->type == GST_RTCP_TYPE_PSFB, NULL);
g_return_val_if_fail (packet->rtcp != NULL, NULL);
g_return_val_if_fail (packet->rtcp->map.flags & GST_MAP_READ, NULL);
data = packet->rtcp->map.data + packet->offset;
if (GST_READ_UINT16_BE (data + 2) <= 2)
return NULL;
return data + 12;
}
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