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

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/* GStreamer
* Copyright (C) <2005> Philippe Khalaf <burger@speedy.org>
* Copyright (C) <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.
*/
/**
* SECTION:gstrtpbuffer
* @short_description: Helper methods for dealing with RTP buffers
* @see_also: #GstBaseRTPPayload, #GstBaseRTPDepayload, gstrtcpbuffer
*
* <refsect2>
* <para>
* The GstRTPBuffer helper functions makes it easy to parse and create regular
* #GstBuffer objects that contain RTP payloads. These buffers are typically of
* 'application/x-rtp' #GstCaps.
* </para>
* </refsect2>
*
* Last reviewed on 2006-07-17 (0.10.10)
*/
#include "gstrtpbuffer.h"
#include <stdlib.h>
#include <string.h>
#define GST_RTP_HEADER_LEN 12
/* Note: we use bitfields here to make sure the compiler doesn't add padding
* between fields on certain architectures; can't assume aligned access either
*/
typedef struct _GstRTPHeader
{
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
unsigned int csrc_count:4; /* CSRC count */
unsigned int extension:1; /* header extension flag */
unsigned int padding:1; /* padding flag */
unsigned int version:2; /* protocol version */
unsigned int payload_type:7; /* payload type */
unsigned int marker:1; /* marker bit */
#elif G_BYTE_ORDER == G_BIG_ENDIAN
unsigned int version:2; /* protocol version */
unsigned int padding:1; /* padding flag */
unsigned int extension:1; /* header extension flag */
unsigned int csrc_count:4; /* CSRC count */
unsigned int marker:1; /* marker bit */
unsigned int payload_type:7; /* payload type */
#else
#error "G_BYTE_ORDER should be big or little endian."
#endif
unsigned int seq:16; /* sequence number */
unsigned int timestamp:32; /* timestamp */
unsigned int ssrc:32; /* synchronization source */
guint8 csrclist[4]; /* optional CSRC list, 32 bits each */
} GstRTPHeader;
#define GST_RTP_HEADER_VERSION(data) (((GstRTPHeader *)(data))->version)
#define GST_RTP_HEADER_PADDING(data) (((GstRTPHeader *)(data))->padding)
#define GST_RTP_HEADER_EXTENSION(data) (((GstRTPHeader *)(data))->extension)
#define GST_RTP_HEADER_CSRC_COUNT(data) (((GstRTPHeader *)(data))->csrc_count)
#define GST_RTP_HEADER_MARKER(data) (((GstRTPHeader *)(data))->marker)
#define GST_RTP_HEADER_PAYLOAD_TYPE(data) (((GstRTPHeader *)(data))->payload_type)
#define GST_RTP_HEADER_SEQ(data) (((GstRTPHeader *)(data))->seq)
#define GST_RTP_HEADER_TIMESTAMP(data) (((GstRTPHeader *)(data))->timestamp)
#define GST_RTP_HEADER_SSRC(data) (((GstRTPHeader *)(data))->ssrc)
#define GST_RTP_HEADER_CSRC_LIST_OFFSET(data,i) \
data + G_STRUCT_OFFSET(GstRTPHeader, csrclist) + \
((i) * sizeof(guint32))
#define GST_RTP_HEADER_CSRC_SIZE(data) (GST_RTP_HEADER_CSRC_COUNT(data) * sizeof (guint32))
/**
* gst_rtp_buffer_allocate_data:
* @buffer: a #GstBuffer
* @payload_len: the length of the payload
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Allocate enough data in @buffer to hold an RTP packet with @csrc_count CSRCs,
* a payload length of @payload_len and padding of @pad_len.
* MALLOCDATA of @buffer will be overwritten and will not be freed.
* All other RTP header fields will be set to 0/FALSE.
*/
void
gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
guint8 pad_len, guint8 csrc_count)
{
guint len;
guint8 *data;
g_return_if_fail (csrc_count <= 15);
g_return_if_fail (GST_IS_BUFFER (buffer));
len = GST_RTP_HEADER_LEN + csrc_count * sizeof (guint32)
+ payload_len + pad_len;
data = g_malloc (len);
GST_BUFFER_MALLOCDATA (buffer) = data;
GST_BUFFER_DATA (buffer) = data;
GST_BUFFER_SIZE (buffer) = len;
/* fill in defaults */
GST_RTP_HEADER_VERSION (data) = GST_RTP_VERSION;
GST_RTP_HEADER_PADDING (data) = FALSE;
GST_RTP_HEADER_EXTENSION (data) = FALSE;
GST_RTP_HEADER_CSRC_COUNT (data) = csrc_count;
memset (GST_RTP_HEADER_CSRC_LIST_OFFSET (data, 0), 0,
csrc_count * sizeof (guint32));
GST_RTP_HEADER_MARKER (data) = FALSE;
GST_RTP_HEADER_PAYLOAD_TYPE (data) = 0;
GST_RTP_HEADER_SEQ (data) = 0;
GST_RTP_HEADER_TIMESTAMP (data) = 0;
GST_RTP_HEADER_SSRC (data) = 0;
}
/**
* gst_rtp_buffer_new_take_data:
* @data: 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_rtp_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 ();
GST_BUFFER_MALLOCDATA (result) = data;
GST_BUFFER_DATA (result) = data;
GST_BUFFER_SIZE (result) = len;
return result;
}
/**
* gst_rtp_buffer_new_copy_data:
* @data: 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_rtp_buffer_new_copy_data (gpointer data, guint len)
{
return gst_rtp_buffer_new_take_data (g_memdup (data, len), len);
}
/**
* gst_rtp_buffer_new_allocate:
* @payload_len: the length of the payload
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Allocate a new #GstBuffer with enough data to hold an RTP packet with
* @csrc_count CSRCs, a payload length of @payload_len and padding of @pad_len.
* All other RTP header fields will be set to 0/FALSE.
*
* Returns: A newly allocated buffer that can hold an RTP packet with given
* parameters.
*/
GstBuffer *
gst_rtp_buffer_new_allocate (guint payload_len, guint8 pad_len,
guint8 csrc_count)
{
GstBuffer *result;
g_return_val_if_fail (csrc_count <= 15, NULL);
result = gst_buffer_new ();
gst_rtp_buffer_allocate_data (result, payload_len, pad_len, csrc_count);
return result;
}
/**
* gst_rtp_buffer_new_allocate_len:
* @packet_len: the total length of the packet
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Create a new #GstBuffer that can hold an RTP packet that is exactly
* @packet_len long. The length of the payload depends on @pad_len and
* @csrc_count and can be calculated with gst_rtp_buffer_calc_payload_len().
* All RTP header fields will be set to 0/FALSE.
*
* Returns: A newly allocated buffer that can hold an RTP packet of @packet_len.
*/
GstBuffer *
gst_rtp_buffer_new_allocate_len (guint packet_len, guint8 pad_len,
guint8 csrc_count)
{
guint len;
g_return_val_if_fail (csrc_count <= 15, NULL);
len = gst_rtp_buffer_calc_payload_len (packet_len, pad_len, csrc_count);
return gst_rtp_buffer_new_allocate (len, pad_len, csrc_count);
}
/**
* gst_rtp_buffer_calc_header_len:
* @csrc_count: the number of CSRC entries
*
* Calculate the header length of an RTP packet with @csrc_count CSRC entries.
* An RTP packet can have at most 15 CSRC entries.
*
* Returns: The length of an RTP header with @csrc_count CSRC entries.
*/
guint
gst_rtp_buffer_calc_header_len (guint8 csrc_count)
{
g_return_val_if_fail (csrc_count <= 15, 0);
return GST_RTP_HEADER_LEN + (csrc_count * sizeof (guint32));
}
/**
* gst_rtp_buffer_calc_packet_len:
* @payload_len: the length of the payload
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Calculate the total length of an RTP packet with a payload size of @payload_len,
* a padding of @pad_len and a @csrc_count CSRC entries.
*
* Returns: The total length of an RTP header with given parameters.
*/
guint
gst_rtp_buffer_calc_packet_len (guint payload_len, guint8 pad_len,
guint8 csrc_count)
{
g_return_val_if_fail (csrc_count <= 15, 0);
return payload_len + GST_RTP_HEADER_LEN + (csrc_count * sizeof (guint32))
+ pad_len;
}
/**
* gst_rtp_buffer_calc_payload_len:
* @packet_len: the length of the total RTP packet
* @pad_len: the amount of padding
* @csrc_count: the number of CSRC entries
*
* Calculate the length of the payload of an RTP packet with size @packet_len,
* a padding of @pad_len and a @csrc_count CSRC entries.
*
* Returns: The length of the payload of an RTP packet with given parameters.
*/
guint
gst_rtp_buffer_calc_payload_len (guint packet_len, guint8 pad_len,
guint8 csrc_count)
{
g_return_val_if_fail (csrc_count <= 15, 0);
return packet_len - GST_RTP_HEADER_LEN - (csrc_count * sizeof (guint32))
- pad_len;
}
/**
* validate_data:
* @data: the data to validate
* @len: the length of @data to validate
* @payload: the payload if @data represents the header only
* @payload_len: the len of the payload
*
* Checks if @data is a valid RTP packet.
*
* Returns: TRUE if @data is a valid RTP packet
*/
static gboolean
validate_data (guint8 * data, guint len, guint8 * payload, guint payload_len)
{
guint8 padding;
guint8 csrc_count;
guint header_len;
guint8 version;
g_return_val_if_fail (data != NULL, FALSE);
header_len = GST_RTP_HEADER_LEN;
if (G_UNLIKELY (len < header_len))
goto wrong_length;
/* check version */
version = (data[0] & 0xc0);
if (G_UNLIKELY (version != (GST_RTP_VERSION << 6)))
goto wrong_version;
/* calc header length with csrc */
csrc_count = (data[0] & 0x0f);
header_len += csrc_count * sizeof (guint32);
/* calc extension length when present. */
if (data[0] & 0x10) {
guint8 *extpos;
guint16 extlen;
/* this points to the extenstion bits and header length */
extpos = &data[header_len];
/* skip the header and check that we have enough space */
header_len += 4;
if (G_UNLIKELY (len < header_len))
goto wrong_length;
/* skip id */
extpos += 2;
/* read length as the number of 32 bits words */
extlen = GST_READ_UINT16_BE (extpos);
header_len += extlen * sizeof (guint32);
}
/* check for padding */
if (data[0] & 0x20) {
if (payload)
padding = payload[payload_len - 1];
else
padding = data[len - 1];
} else {
padding = 0;
}
/* check if padding and header not bigger than packet length */
if (G_UNLIKELY (len < padding + header_len))
goto wrong_padding;
return TRUE;
/* ERRORS */
wrong_length:
{
GST_DEBUG ("len < header_len check failed (%d < %d)", len, header_len);
goto dump_packet;
}
wrong_version:
{
GST_DEBUG ("version check failed (%d != %d)", version, GST_RTP_VERSION);
goto dump_packet;
}
wrong_padding:
{
GST_DEBUG ("padding check failed (%d - %d < %d)", len, header_len, padding);
goto dump_packet;
}
dump_packet:
{
GST_MEMDUMP ("buffer", data, len);
return FALSE;
}
}
/**
* gst_rtp_buffer_validate_data:
* @data: the data to validate
* @len: the length of @data to validate
*
* Check if the @data and @size point to the data of a valid RTP packet.
* This function checks the length, version and padding of the packet data.
* Use this function to validate a packet before using the other functions in
* this module.
*
* Returns: TRUE if the data points to a valid RTP packet.
*/
gboolean
gst_rtp_buffer_validate_data (guint8 * data, guint len)
{
return validate_data (data, len, NULL, 0);
}
/**
* gst_rtp_buffer_validate:
* @buffer: the buffer to validate
*
* Check if the data pointed to by @buffer is a valid RTP packet using
* validate_data().
* Use this function to validate a packet before using the other functions in
* this module.
*
* Returns: TRUE if @buffer is a valid RTP packet.
*/
gboolean
gst_rtp_buffer_validate (GstBuffer * buffer)
{
guint8 *data;
guint len;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
data = GST_BUFFER_DATA (buffer);
len = GST_BUFFER_SIZE (buffer);
return validate_data (data, len, NULL, 0);
}
/**
* gst_rtp_buffer_list_validate:
* @list: the buffer list to validate
*
* Check if all RTP packets in the @list are valid using validate_data().
* Use this function to validate an list before using the other functions in
* this module.
*
* Returns: TRUE if @list consists only of valid RTP packets.
*
* Since: 0.10.24
*/
gboolean
gst_rtp_buffer_list_validate (GstBufferList * list)
{
guint16 prev_seqnum = 0;
GstBufferListIterator *it;
guint i = 0;
g_return_val_if_fail (GST_IS_BUFFER_LIST (list), FALSE);
it = gst_buffer_list_iterate (list);
g_return_val_if_fail (it != NULL, FALSE);
/* iterate through all the RTP packets in the list */
while (gst_buffer_list_iterator_next_group (it)) {
GstBuffer *rtpbuf;
GstBuffer *paybuf;
guint8 *packet_header;
guint8 *packet_payload;
guint payload_size;
guint packet_size;
guint j, n_buffers;
/* each group should consists of at least 1 buffer: The first buffer always
* contains the complete RTP header. Next buffers contain the payload */
n_buffers = gst_buffer_list_iterator_n_buffers (it);
if (n_buffers < 1)
goto invalid_list;
/* get the RTP header (and if n_buffers == 1 also the payload) */
rtpbuf = gst_buffer_list_iterator_next (it);
packet_header = GST_BUFFER_DATA (rtpbuf);
if (packet_header == NULL)
goto invalid_list;
/* check the sequence number */
if (G_UNLIKELY (i == 0)) {
prev_seqnum = g_ntohs (GST_RTP_HEADER_SEQ (packet_header));
i++;
} else {
if (++prev_seqnum != g_ntohs (GST_RTP_HEADER_SEQ (packet_header)))
goto invalid_list;
}
packet_size = GST_BUFFER_SIZE (rtpbuf);
packet_payload = NULL;
payload_size = 0;
/* get the payload buffers */
for (j = 1; j < n_buffers; j++) {
/* get the payload */
paybuf = gst_buffer_list_iterator_next (it);
if ((packet_payload = GST_BUFFER_DATA (paybuf)) == NULL)
goto invalid_list;
if ((payload_size = GST_BUFFER_SIZE (paybuf)) == 0)
goto invalid_list;
/* the size of the RTP packet within the current group */
packet_size += payload_size;
}
/* validate packet */
if (!validate_data (packet_header, packet_size, packet_payload,
payload_size)) {
goto invalid_list;
}
}
gst_buffer_list_iterator_free (it);
return TRUE;
/* ERRORS */
invalid_list:
{
gst_buffer_list_iterator_free (it);
return FALSE;
}
}
/**
* gst_rtp_buffer_set_packet_len:
* @buffer: the buffer
* @len: the new packet length
*
* Set the total @buffer size to @len. The data in the buffer will be made
* larger if needed. Any padding will be removed from the packet.
*/
void
gst_rtp_buffer_set_packet_len (GstBuffer * buffer, guint len)
{
guint oldlen;
guint8 *data;
oldlen = GST_BUFFER_SIZE (buffer);
data = GST_BUFFER_DATA (buffer);
if (oldlen < len) {
data = g_realloc (GST_BUFFER_MALLOCDATA (buffer), len);
GST_BUFFER_MALLOCDATA (buffer) = data;
GST_BUFFER_DATA (buffer) = data;
}
GST_BUFFER_SIZE (buffer) = len;
/* remove any padding */
GST_RTP_HEADER_PADDING (data) = FALSE;
}
/**
* gst_rtp_buffer_get_packet_len:
* @buffer: the buffer
*
* Return the total length of the packet in @buffer.
*
* Returns: The total length of the packet in @buffer.
*/
guint
gst_rtp_buffer_get_packet_len (GstBuffer * buffer)
{
return GST_BUFFER_SIZE (buffer);
}
/**
* gst_rtp_buffer_get_header_len:
* @buffer: the buffer
*
* Return the total length of the header in @buffer. This include the length of
* the fixed header, the CSRC list and the extension header.
*
* Returns: The total length of the header in @buffer.
*/
guint
gst_rtp_buffer_get_header_len (GstBuffer * buffer)
{
guint len;
guint8 *data;
data = GST_BUFFER_DATA (buffer);
len = GST_RTP_HEADER_LEN + GST_RTP_HEADER_CSRC_SIZE (data);
if (GST_RTP_HEADER_EXTENSION (data))
len += GST_READ_UINT16_BE (data + len + 2) * 4 + 4;
return len;
}
/**
* gst_rtp_buffer_get_version:
* @buffer: the buffer
*
* Get the version number of the RTP packet in @buffer.
*
* Returns: The version of @buffer.
*/
guint8
gst_rtp_buffer_get_version (GstBuffer * buffer)
{
return GST_RTP_HEADER_VERSION (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_set_version:
* @buffer: the buffer
* @version: the new version
*
* Set the version of the RTP packet in @buffer to @version.
*/
void
gst_rtp_buffer_set_version (GstBuffer * buffer, guint8 version)
{
g_return_if_fail (version < 0x04);
GST_RTP_HEADER_VERSION (GST_BUFFER_DATA (buffer)) = version;
}
/**
* gst_rtp_buffer_get_padding:
* @buffer: the buffer
*
* Check if the padding bit is set on the RTP packet in @buffer.
*
* Returns: TRUE if @buffer has the padding bit set.
*/
gboolean
gst_rtp_buffer_get_padding (GstBuffer * buffer)
{
return GST_RTP_HEADER_PADDING (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_set_padding:
* @buffer: the buffer
* @padding: the new padding
*
* Set the padding bit on the RTP packet in @buffer to @padding.
*/
void
gst_rtp_buffer_set_padding (GstBuffer * buffer, gboolean padding)
{
GST_RTP_HEADER_PADDING (GST_BUFFER_DATA (buffer)) = padding;
}
/**
* gst_rtp_buffer_pad_to:
* @buffer: the buffer
* @len: the new amount of padding
*
* Set the amount of padding in the RTP packet in @buffer to
* @len. If @len is 0, the padding is removed.
*
* NOTE: This function does not work correctly.
*/
void
gst_rtp_buffer_pad_to (GstBuffer * buffer, guint len)
{
guint8 *data;
data = GST_BUFFER_DATA (buffer);
if (len > 0)
GST_RTP_HEADER_PADDING (data) = TRUE;
else
GST_RTP_HEADER_PADDING (data) = FALSE;
/* FIXME, set the padding byte at the end of the payload data */
}
/**
* gst_rtp_buffer_get_extension:
* @buffer: the buffer
*
* Check if the extension bit is set on the RTP packet in @buffer.
*
* Returns: TRUE if @buffer has the extension bit set.
*/
gboolean
gst_rtp_buffer_get_extension (GstBuffer * buffer)
{
return GST_RTP_HEADER_EXTENSION (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_set_extension:
* @buffer: the buffer
* @extension: the new extension
*
* Set the extension bit on the RTP packet in @buffer to @extension.
*/
void
gst_rtp_buffer_set_extension (GstBuffer * buffer, gboolean extension)
{
GST_RTP_HEADER_EXTENSION (GST_BUFFER_DATA (buffer)) = extension;
}
/**
* gst_rtp_buffer_get_extension_data:
* @buffer: the buffer
* @bits: location for result bits
* @data: location for data
* @wordlen: location for length of @data in 32 bits words
*
* Get the extension data. @bits will contain the extension 16 bits of custom
* data. @data will point to the data in the extension and @wordlen will contain
* the length of @data in 32 bits words.
*
* If @buffer did not contain an extension, this function will return %FALSE
* with @bits, @data and @wordlen unchanged.
*
* Returns: TRUE if @buffer had the extension bit set.
*
* Since: 0.10.15
*/
gboolean
gst_rtp_buffer_get_extension_data (GstBuffer * buffer, guint16 * bits,
gpointer * data, guint * wordlen)
{
guint len;
guint8 *pdata;
pdata = GST_BUFFER_DATA (buffer);
if (!GST_RTP_HEADER_EXTENSION (pdata))
return FALSE;
/* move to the extension */
len = GST_RTP_HEADER_LEN + GST_RTP_HEADER_CSRC_SIZE (pdata);
pdata += len;
if (bits)
*bits = GST_READ_UINT16_BE (pdata);
if (wordlen)
*wordlen = GST_READ_UINT16_BE (pdata + 2);
if (data)
*data = pdata + 4;
return TRUE;
}
/**
* gst_rtp_buffer_set_extension_data:
* @buffer: the buffer
* @bits: the bits specific for the extension
* @length: the length that counts the number of 32-bit words in
* the extension, excluding the extension header ( therefore zero is a valid length)
*
* Set the extension bit of the rtp buffer and fill in the @bits and @length of the
* extension header. It will refuse to set the extension data if the buffer is not
* large enough.
*
* Returns: True if done.
*
* Since: 0.10.18
*/
gboolean
gst_rtp_buffer_set_extension_data (GstBuffer * buffer, guint16 bits,
guint16 length)
{
guint32 min_size = 0;
guint8 *data;
data = GST_BUFFER_DATA (buffer);
/* check if the buffer is big enough to hold the extension */
min_size =
GST_RTP_HEADER_LEN + GST_RTP_HEADER_CSRC_SIZE (data) + 4 +
length * sizeof (guint32);
if (G_UNLIKELY (min_size > GST_BUFFER_SIZE (buffer)))
goto too_small;
/* now we can set the extension bit */
gst_rtp_buffer_set_extension (buffer, TRUE);
data += GST_RTP_HEADER_LEN + GST_RTP_HEADER_CSRC_SIZE (data);
GST_WRITE_UINT16_BE (data, bits);
GST_WRITE_UINT16_BE (data + 2, length);
return TRUE;
/* ERRORS */
too_small:
{
g_warning
("rtp buffer too small: need more than %d bytes but only have %d bytes",
min_size, GST_BUFFER_SIZE (buffer));
return FALSE;
}
}
/**
* gst_rtp_buffer_get_ssrc:
* @buffer: the buffer
*
* Get the SSRC of the RTP packet in @buffer.
*
* Returns: the SSRC of @buffer in host order.
*/
guint32
gst_rtp_buffer_get_ssrc (GstBuffer * buffer)
{
return g_ntohl (GST_RTP_HEADER_SSRC (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_list_get_ssrc:
* @list: the buffer list
*
* Get the SSRC of the first RTP packet in @list.
* All RTP packets within @list have the same SSRC.
*
* Returns: the SSRC of @list in host order.
*
* Since: 0.10.24
*/
guint32
gst_rtp_buffer_list_get_ssrc (GstBufferList * list)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (list, 0, 0);
g_return_val_if_fail (buffer != NULL, 0);
return g_ntohl (GST_RTP_HEADER_SSRC (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_set_ssrc:
* @buffer: the buffer
* @ssrc: the new SSRC
*
* Set the SSRC on the RTP packet in @buffer to @ssrc.
*/
void
gst_rtp_buffer_set_ssrc (GstBuffer * buffer, guint32 ssrc)
{
GST_RTP_HEADER_SSRC (GST_BUFFER_DATA (buffer)) = g_htonl (ssrc);
}
static GstBufferListItem
set_ssrc_header (GstBuffer ** buffer, guint group, guint idx, guint32 * ssrc)
{
GST_RTP_HEADER_SSRC (GST_BUFFER_DATA (*buffer)) = g_htonl (*ssrc);
return GST_BUFFER_LIST_SKIP_GROUP;
}
/**
* gst_rtp_buffer_list_set_ssrc:
* @list: the buffer list
* @ssrc: the new SSRC
*
* Set the SSRC on each RTP packet in @list to @ssrc.
*
* Since: 0.10.24
*/
void
gst_rtp_buffer_list_set_ssrc (GstBufferList * list, guint32 ssrc)
{
gst_buffer_list_foreach (list, (GstBufferListFunc) set_ssrc_header, &ssrc);
}
/**
* gst_rtp_buffer_get_csrc_count:
* @buffer: the buffer
*
* Get the CSRC count of the RTP packet in @buffer.
*
* Returns: the CSRC count of @buffer.
*/
guint8
gst_rtp_buffer_get_csrc_count (GstBuffer * buffer)
{
return GST_RTP_HEADER_CSRC_COUNT (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_get_csrc:
* @buffer: the buffer
* @idx: the index of the CSRC to get
*
* Get the CSRC at index @idx in @buffer.
*
* Returns: the CSRC at index @idx in host order.
*/
guint32
gst_rtp_buffer_get_csrc (GstBuffer * buffer, guint8 idx)
{
guint8 *data;
data = GST_BUFFER_DATA (buffer);
g_return_val_if_fail (idx < GST_RTP_HEADER_CSRC_COUNT (data), 0);
return GST_READ_UINT32_BE (GST_RTP_HEADER_CSRC_LIST_OFFSET (data, idx));
}
/**
* gst_rtp_buffer_set_csrc:
* @buffer: the buffer
* @idx: the CSRC index to set
* @csrc: the CSRC in host order to set at @idx
*
* Modify the CSRC at index @idx in @buffer to @csrc.
*/
void
gst_rtp_buffer_set_csrc (GstBuffer * buffer, guint8 idx, guint32 csrc)
{
guint8 *data;
data = GST_BUFFER_DATA (buffer);
g_return_if_fail (idx < GST_RTP_HEADER_CSRC_COUNT (data));
GST_WRITE_UINT32_BE (GST_RTP_HEADER_CSRC_LIST_OFFSET (data, idx), csrc);
}
/**
* gst_rtp_buffer_get_marker:
* @buffer: the buffer
*
* Check if the marker bit is set on the RTP packet in @buffer.
*
* Returns: TRUE if @buffer has the marker bit set.
*/
gboolean
gst_rtp_buffer_get_marker (GstBuffer * buffer)
{
return GST_RTP_HEADER_MARKER (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_set_marker:
* @buffer: the buffer
* @marker: the new marker
*
* Set the marker bit on the RTP packet in @buffer to @marker.
*/
void
gst_rtp_buffer_set_marker (GstBuffer * buffer, gboolean marker)
{
GST_RTP_HEADER_MARKER (GST_BUFFER_DATA (buffer)) = marker;
}
/**
* gst_rtp_buffer_get_payload_type:
* @buffer: the buffer
*
* Get the payload type of the RTP packet in @buffer.
*
* Returns: The payload type.
*/
guint8
gst_rtp_buffer_get_payload_type (GstBuffer * buffer)
{
return GST_RTP_HEADER_PAYLOAD_TYPE (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_list_get_payload_type:
* @list: the buffer list
*
* Get the payload type of the first RTP packet in @list.
* All packets in @list should have the same payload type.
*
* Returns: The payload type.
*
* Since: 0.10.24
*/
guint8
gst_rtp_buffer_list_get_payload_type (GstBufferList * list)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (list, 0, 0);
g_return_val_if_fail (buffer != NULL, 0);
return GST_RTP_HEADER_PAYLOAD_TYPE (GST_BUFFER_DATA (buffer));
}
/**
* gst_rtp_buffer_set_payload_type:
* @buffer: the buffer
* @payload_type: the new type
*
* Set the payload type of the RTP packet in @buffer to @payload_type.
*/
void
gst_rtp_buffer_set_payload_type (GstBuffer * buffer, guint8 payload_type)
{
g_return_if_fail (payload_type < 0x80);
GST_RTP_HEADER_PAYLOAD_TYPE (GST_BUFFER_DATA (buffer)) = payload_type;
}
static GstBufferListItem
set_pt_header (GstBuffer ** buffer, guint group, guint idx, guint8 * pt)
{
GST_RTP_HEADER_PAYLOAD_TYPE (GST_BUFFER_DATA (*buffer)) = *pt;
return GST_BUFFER_LIST_SKIP_GROUP;
}
/**
* gst_rtp_buffer_list_set_payload_type:
* @list: the buffer list
* @payload_type: the new type
*
* Set the payload type of each RTP packet in @list to @payload_type.
*
* Since: 0.10.24
*/
void
gst_rtp_buffer_list_set_payload_type (GstBufferList * list, guint8 payload_type)
{
g_return_if_fail (payload_type < 0x80);
gst_buffer_list_foreach (list, (GstBufferListFunc) set_pt_header,
&payload_type);
}
/**
* gst_rtp_buffer_get_seq:
* @buffer: the buffer
*
* Get the sequence number of the RTP packet in @buffer.
*
* Returns: The sequence number in host order.
*/
guint16
gst_rtp_buffer_get_seq (GstBuffer * buffer)
{
return g_ntohs (GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_set_seq:
* @buffer: the buffer
* @seq: the new sequence number
*
* Set the sequence number of the RTP packet in @buffer to @seq.
*/
void
gst_rtp_buffer_set_seq (GstBuffer * buffer, guint16 seq)
{
GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)) = g_htons (seq);
}
static GstBufferListItem
set_seq_header (GstBuffer ** buffer, guint group, guint idx, guint16 * seq)
{
GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (*buffer)) = g_htons (*seq);
(*seq)++;
return GST_BUFFER_LIST_SKIP_GROUP;
}
/**
* gst_rtp_buffer_list_set_seq:
* @list: the buffer list
* @seq: the new sequence number
*
* Set the sequence number of each RTP packet in @list to @seq.
*
* Returns: The seq number of the last packet in the list + 1.
*
* Since: 0.10.24
*/
guint16
gst_rtp_buffer_list_set_seq (GstBufferList * list, guint16 seq)
{
gst_buffer_list_foreach (list, (GstBufferListFunc) set_seq_header, &seq);
return seq;
}
/**
* gst_rtp_buffer_list_get_seq:
* @list: the buffer list
*
* Get the sequence number of the first RTP packet in @list.
* All packets within @list have the same sequence number.
*
* Returns: The seq number
*
* Since: 0.10.24
*/
guint16
gst_rtp_buffer_list_get_seq (GstBufferList * list)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (list, 0, 0);
g_return_val_if_fail (buffer != NULL, 0);
return g_ntohl (GST_RTP_HEADER_SEQ (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_get_timestamp:
* @buffer: the buffer
*
* Get the timestamp of the RTP packet in @buffer.
*
* Returns: The timestamp in host order.
*/
guint32
gst_rtp_buffer_get_timestamp (GstBuffer * buffer)
{
return g_ntohl (GST_RTP_HEADER_TIMESTAMP (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_list_get_timestamp:
* @list: the buffer list
*
* Get the timestamp of the first RTP packet in @list.
* All packets within @list have the same timestamp.
*
* Returns: The timestamp in host order.
*
* Since: 0.10.24
*/
guint32
gst_rtp_buffer_list_get_timestamp (GstBufferList * list)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (list, 0, 0);
g_return_val_if_fail (buffer != NULL, 0);
return g_ntohl (GST_RTP_HEADER_TIMESTAMP (GST_BUFFER_DATA (buffer)));
}
/**
* gst_rtp_buffer_set_timestamp:
* @buffer: the buffer
* @timestamp: the new timestamp
*
* Set the timestamp of the RTP packet in @buffer to @timestamp.
*/
void
gst_rtp_buffer_set_timestamp (GstBuffer * buffer, guint32 timestamp)
{
GST_RTP_HEADER_TIMESTAMP (GST_BUFFER_DATA (buffer)) = g_htonl (timestamp);
}
static GstBufferListItem
set_timestamp_header (GstBuffer ** buffer, guint group, guint idx,
guint32 * timestamp)
{
GST_RTP_HEADER_TIMESTAMP (GST_BUFFER_DATA (*buffer)) = g_htonl (*timestamp);
return GST_BUFFER_LIST_SKIP_GROUP;
}
/**
* gst_rtp_buffer_list_set_timestamp:
* @list: the buffer list
* @timestamp: the new timestamp
*
* Set the timestamp of each RTP packet in @list to @timestamp.
*
* Since: 0.10.24
*/
void
gst_rtp_buffer_list_set_timestamp (GstBufferList * list, guint32 timestamp)
{
gst_buffer_list_foreach (list, (GstBufferListFunc) set_timestamp_header,
&timestamp);
}
/**
* gst_rtp_buffer_get_payload_subbuffer:
* @buffer: the buffer
* @offset: the offset in the payload
* @len: the length in the payload
*
* Create a subbuffer of the payload of the RTP packet in @buffer. @offset bytes
* are skipped in the payload and the subbuffer will be of size @len.
* If @len is -1 the total payload starting from @offset if subbuffered.
*
* Returns: A new buffer with the specified data of the payload.
*
* Since: 0.10.10
*/
GstBuffer *
gst_rtp_buffer_get_payload_subbuffer (GstBuffer * buffer, guint offset,
guint len)
{
guint poffset, plen;
plen = gst_rtp_buffer_get_payload_len (buffer);
/* we can't go past the length */
if (G_UNLIKELY (offset >= plen))
goto wrong_offset;
/* apply offset */
poffset = gst_rtp_buffer_get_header_len (buffer) + offset;
plen -= offset;
/* see if we need to shrink the buffer based on @len */
if (len != -1 && len < plen)
plen = len;
return gst_buffer_create_sub (buffer, poffset, plen);
/* ERRORS */
wrong_offset:
{
g_warning ("offset=%u should be less then plen=%u", offset, plen);
return NULL;
}
}
/**
* gst_rtp_buffer_get_payload_buffer:
* @buffer: the buffer
*
* Create a buffer of the payload of the RTP packet in @buffer. This function
* will internally create a subbuffer of @buffer so that a memcpy can be
* avoided.
*
* Returns: A new buffer with the data of the payload.
*/
GstBuffer *
gst_rtp_buffer_get_payload_buffer (GstBuffer * buffer)
{
return gst_rtp_buffer_get_payload_subbuffer (buffer, 0, -1);
}
/**
* gst_rtp_buffer_get_payload_len:
* @buffer: the buffer
*
* Get the length of the payload of the RTP packet in @buffer.
*
* Returns: The length of the payload in @buffer.
*/
guint
gst_rtp_buffer_get_payload_len (GstBuffer * buffer)
{
guint len, size;
guint8 *data;
size = GST_BUFFER_SIZE (buffer);
data = GST_BUFFER_DATA (buffer);
len = size - gst_rtp_buffer_get_header_len (buffer);
if (GST_RTP_HEADER_PADDING (data))
len -= data[size - 1];
return len;
}
/**
* gst_rtp_buffer_list_get_payload_len:
* @list: the buffer list
*
* Get the length of the payload of the RTP packet in @list.
*
* Returns: The length of the payload in @list.
*
* Since: 0.10.24
*/
guint
gst_rtp_buffer_list_get_payload_len (GstBufferList * list)
{
guint len;
GstBufferListIterator *it;
it = gst_buffer_list_iterate (list);
len = 0;
while (gst_buffer_list_iterator_next_group (it)) {
guint i;
GstBuffer *buf;
i = 0;
while ((buf = gst_buffer_list_iterator_next (it))) {
/* skip the RTP header */
if (!i++)
continue;
/* take the size of the current buffer */
len += GST_BUFFER_SIZE (buf);
}
}
gst_buffer_list_iterator_free (it);
return len;
}
/**
* gst_rtp_buffer_get_payload:
* @buffer: the buffer
*
* Get a pointer to the payload data in @buffer. This pointer is valid as long
* as a reference to @buffer is held.
*
* Returns: A pointer to the payload data in @buffer.
*/
gpointer
gst_rtp_buffer_get_payload (GstBuffer * buffer)
{
return GST_BUFFER_DATA (buffer) + gst_rtp_buffer_get_header_len (buffer);
}
/**
* gst_rtp_buffer_default_clock_rate:
* @payload_type: the static payload type
*
* Get the default clock-rate for the static payload type @payload_type.
*
* Returns: the default clock rate or -1 if the payload type is not static or
* the clock-rate is undefined.
*
* Since: 0.10.13
*/
guint32
gst_rtp_buffer_default_clock_rate (guint8 payload_type)
{
const GstRTPPayloadInfo *info;
guint32 res;
info = gst_rtp_payload_info_for_pt (payload_type);
if (!info)
return -1;
res = info->clock_rate;
/* 0 means unknown so we have to return -1 from this function */
if (res == 0)
res = -1;
return res;
}
/**
* gst_rtp_buffer_compare_seqnum:
* @seqnum1: a sequence number
* @seqnum2: a sequence number
*
* Compare two sequence numbers, taking care of wraparounds. This function
* returns the difference between @seqnum1 and @seqnum2.
*
* Returns: a negative value if @seqnum1 is bigger than @seqnum2, 0 if they
* are equal or a positive value if @seqnum1 is smaller than @segnum2.
*
* Since: 0.10.15
*/
gint
gst_rtp_buffer_compare_seqnum (guint16 seqnum1, guint16 seqnum2)
{
return (gint16) (seqnum2 - seqnum1);
}
/**
* gst_rtp_buffer_ext_timestamp:
* @exttimestamp: a previous extended timestamp
* @timestamp: a new timestamp
*
* Update the @exttimestamp field with @timestamp. For the first call of the
* method, @exttimestamp should point to a location with a value of -1.
*
* This function makes sure that the returned value is a constantly increasing
* value even in the case where there is a timestamp wraparound.
*
* Returns: The extended timestamp of @timestamp.
*
* Since: 0.10.15
*/
guint64
gst_rtp_buffer_ext_timestamp (guint64 * exttimestamp, guint32 timestamp)
{
guint64 result, diff, ext;
g_return_val_if_fail (exttimestamp != NULL, -1);
ext = *exttimestamp;
if (ext == -1) {
result = timestamp;
} else {
/* pick wraparound counter from previous timestamp and add to new timestamp */
result = timestamp + (ext & ~(G_GINT64_CONSTANT (0xffffffff)));
/* check for timestamp wraparound */
if (result < ext)
diff = ext - result;
else
diff = result - ext;
if (diff > G_MAXINT32) {
/* timestamp went backwards more than allowed, we wrap around and get
* updated extended timestamp. */
result += (G_GINT64_CONSTANT (1) << 32);
}
}
*exttimestamp = result;
return result;
}
/**
* gst_rtp_buffer_get_extension_onebyte_header:
* @buffer: the buffer
* @id: The ID of the header extension to be read (between 1 and 14).
* @nth: Read the nth extension packet with the requested ID
* @data: location for data
* @size: the size of the data in bytes
*
* Parses RFC 5285 style header extensions with a one byte header. It will
* return the nth extension with the requested id.
*
* Returns: TRUE if @buffer had the requested header extension
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_get_extension_onebyte_header (GstBuffer * buffer, guint8 id,
guint nth, gpointer * data, guint * size)
{
guint16 bits;
guint8 *pdata;
guint wordlen;
gulong offset = 0;
guint count = 0;
g_return_val_if_fail (id > 0 && id < 15, FALSE);
if (!gst_rtp_buffer_get_extension_data (buffer, &bits, (gpointer) & pdata,
&wordlen))
return FALSE;
if (bits != 0xBEDE)
return FALSE;
for (;;) {
guint8 read_id, read_len;
if (offset + 1 >= wordlen * 4)
break;
read_id = GST_READ_UINT8 (pdata + offset) >> 4;
read_len = (GST_READ_UINT8 (pdata + offset) & 0x0F) + 1;
offset += 1;
/* ID 0 means its padding, skip */
if (read_id == 0)
continue;
/* ID 15 is special and means we should stop parsing */
if (read_id == 15)
break;
/* Ignore extension headers where the size does not fit */
if (offset + read_len > wordlen * 4)
break;
/* If we have the right one */
if (id == read_id) {
if (nth == count) {
if (data)
*data = pdata + offset;
if (size)
*size = read_len;
return TRUE;
}
count++;
}
offset += read_len;
if (offset >= wordlen * 4)
break;
}
return FALSE;
}
/**
* gst_rtp_buffer_get_extension_twobytes_header:
* @buffer: the buffer
* @appbits: Application specific bits
* @id: The ID of the header extension to be read (between 1 and 14).
* @nth: Read the nth extension packet with the requested ID
* @data: location for data
* @size: the size of the data in bytes
*
* Parses RFC 5285 style header extensions with a two bytes header. It will
* return the nth extension with the requested id.
*
* Returns: TRUE if @buffer had the requested header extension
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_get_extension_twobytes_header (GstBuffer * buffer,
guint8 * appbits, guint8 id, guint nth, gpointer * data, guint * size)
{
guint16 bits;
guint8 *pdata;
guint wordlen;
guint bytelen;
gulong offset = 0;
guint count = 0;
if (!gst_rtp_buffer_get_extension_data (buffer, &bits, (gpointer) & pdata,
&wordlen))
return FALSE;
if (bits >> 4 != 0x100)
return FALSE;
bytelen = wordlen * 4;
for (;;) {
guint8 read_id, read_len;
if (offset + 2 >= bytelen)
break;
read_id = GST_READ_UINT8 (pdata + offset);
offset += 1;
if (read_id == 0)
continue;
read_len = GST_READ_UINT8 (pdata + offset);
offset += 1;
/* Ignore extension headers where the size does not fit */
if (offset + read_len > bytelen)
break;
/* If we have the right one, return it */
if (id == read_id) {
if (nth == count) {
if (data)
*data = pdata + offset;
if (size)
*size = read_len;
if (appbits)
*appbits = bits;
return TRUE;
}
count++;
}
offset += read_len;
}
return FALSE;
}
static guint
get_onebyte_header_end_offset (guint8 * pdata, guint wordlen)
{
guint offset = 0;
guint bytelen = wordlen * 4;
guint paddingcount = 0;
while (offset + 1 < bytelen) {
guint8 read_id, read_len;
read_id = GST_READ_UINT8 (pdata + offset) >> 4;
read_len = (GST_READ_UINT8 (pdata + offset) & 0x0F) + 1;
offset += 1;
/* ID 0 means its padding, skip */
if (read_id == 0) {
paddingcount++;
continue;
}
paddingcount = 0;
/* ID 15 is special and means we should stop parsing */
/* It also means we can't add an extra packet */
if (read_id == 15)
return 0;
/* Ignore extension headers where the size does not fit */
if (offset + read_len > bytelen)
return 0;
offset += read_len;
}
return offset - paddingcount;
}
/**
* gst_rtp_buffer_add_extension_onebyte_header:
* @buffer: the buffer
* @id: The ID of the header extension (between 1 and 14).
* @data: location for data
* @size: the size of the data in bytes
*
* Adds a RFC 5285 header extension with a one byte header to the end of the
* RTP header. If there is already a RFC 5285 header extension with a one byte
* header, the new extension will be appended.
* It will not work if there is already a header extension that does not follow
* the mecanism described in RFC 5285 or if there is a header extension with
* a two bytes header as described in RFC 5285. In that case, use
* gst_rtp_buffer_add_extension_twobytes_header()
*
* Returns: %TRUE if header extension could be added
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_add_extension_onebyte_header (GstBuffer * buffer, guint8 id,
gpointer data, guint size)
{
guint16 bits;
guint8 *pdata;
guint wordlen;
gboolean has_bit;
guint bytelen;
g_return_val_if_fail (id > 0 && id < 15, FALSE);
g_return_val_if_fail (size >= 1 && size <= 16, FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
has_bit = gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
bytelen = wordlen * 4;
if (has_bit) {
gulong offset = 0;
guint8 *nextext;
guint extlen;
if (bits != 0xBEDE)
return FALSE;
offset = get_onebyte_header_end_offset (pdata, wordlen);
if (offset == 0)
return FALSE;
nextext = pdata + offset;
offset = nextext - GST_BUFFER_DATA (buffer);
/* Don't add extra header if there isn't enough space */
if (GST_BUFFER_SIZE (buffer) < offset + size + 1)
return FALSE;
nextext[0] = (id << 4) | (0x0F & (size - 1));
memcpy (nextext + 1, data, size);
extlen = nextext - pdata + size + 1;
if (extlen % 4) {
wordlen = extlen / 4 + 1;
memset (nextext + size + 1, 0, 4 - extlen % 4);
} else {
wordlen = extlen / 4;
}
gst_rtp_buffer_set_extension_data (buffer, 0xBEDE, wordlen);
} else {
wordlen = (size + 1) / 4 + (((size + 1) % 4) ? 1 : 0);
gst_rtp_buffer_set_extension_data (buffer, 0xBEDE, wordlen);
gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
pdata[0] = (id << 4) | (0x0F & (size - 1));
memcpy (pdata + 1, data, size);
if ((size + 1) % 4)
memset (pdata + size + 1, 0, 4 - ((size + 1) % 4));
}
return TRUE;
}
static guint
get_twobytes_header_end_offset (guint8 * pdata, guint wordlen)
{
guint offset = 0;
guint bytelen = wordlen * 4;
guint paddingcount = 0;
while (offset + 2 < bytelen) {
guint8 read_id, read_len;
read_id = GST_READ_UINT8 (pdata + offset);
offset += 1;
/* ID 0 means its padding, skip */
if (read_id == 0) {
paddingcount++;
continue;
}
paddingcount = 0;
read_len = GST_READ_UINT8 (pdata + offset);
offset += 1;
/* Ignore extension headers where the size does not fit */
if (offset + read_len > bytelen)
return 0;
offset += read_len;
}
return offset - paddingcount;
}
/**
* gst_rtp_buffer_add_extension_twobytes_header:
* @buffer: the buffer
* @appbits: Application specific bits
* @id: The ID of the header extension
* @data: location for data
* @size: the size of the data in bytes
*
* Adds a RFC 5285 header extension with a two bytes header to the end of the
* RTP header. If there is already a RFC 5285 header extension with a two bytes
* header, the new extension will be appended.
* It will not work if there is already a header extension that does not follow
* the mecanism described in RFC 5285 or if there is a header extension with
* a one byte header as described in RFC 5285. In that case, use
* gst_rtp_buffer_add_extension_onebyte_header()
*
* Returns: %TRUE if header extension could be added
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_add_extension_twobytes_header (GstBuffer * buffer,
guint8 appbits, guint8 id, gpointer data, guint size)
{
guint16 bits;
guint8 *pdata;
guint wordlen;
gboolean has_bit;
guint bytelen;
g_return_val_if_fail ((appbits & 0xF0) == 0, FALSE);
g_return_val_if_fail (size < 256, FALSE);
g_return_val_if_fail (gst_buffer_is_writable (buffer), FALSE);
has_bit = gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
bytelen = wordlen * 4;
if (has_bit) {
gulong offset = 0;
guint8 *nextext;
guint extlen;
if (bits != ((0x100 << 4) | (appbits & 0x0f)))
return FALSE;
offset = get_twobytes_header_end_offset (pdata, wordlen);
nextext = pdata + offset;
offset = nextext - GST_BUFFER_DATA (buffer);
/* Don't add extra header if there isn't enough space */
if (GST_BUFFER_SIZE (buffer) < offset + size + 2)
return FALSE;
nextext[0] = id;
nextext[1] = size;
memcpy (nextext + 2, data, size);
extlen = nextext - pdata + size + 2;
if (extlen % 4) {
wordlen = extlen / 4 + 1;
memset (nextext + size + 2, 0, 4 - extlen % 4);
} else {
wordlen = extlen / 4;
}
gst_rtp_buffer_set_extension_data (buffer, (0x100 << 4) | (appbits & 0x0F),
wordlen);
} else {
wordlen = (size + 2) / 4 + (((size + 2) % 4) ? 1 : 0);
gst_rtp_buffer_set_extension_data (buffer, (0x100 << 4) | (appbits & 0x0F),
wordlen);
gst_rtp_buffer_get_extension_data (buffer, &bits,
(gpointer) & pdata, &wordlen);
pdata[0] = id;
pdata[1] = size;
memcpy (pdata + 2, data, size);
if ((size + 2) % 4)
memset (pdata + size + 2, 0, 4 - ((size + 2) % 4));
}
return TRUE;
}
/**
* gst_rtp_buffer_list_get_extension_onebyte_header:
* @bufferlist: the bufferlist
* @group_idx: The index of the group in the #GstBufferList
* @id: The ID of the header extension to be read (between 1 and 14).
* @nth: Read the nth extension packet with the requested ID
* @data: location for data
* @size: the size of the data in bytes
*
* Parses RFC 5285 style header extensions with a one byte header. It will
* return the nth extension with the requested id.
*
* Returns: TRUE if @buffer had the requested header extension
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_list_get_extension_onebyte_header (GstBufferList * bufferlist,
guint group_idx, guint8 id, guint nth, gpointer * data, guint * size)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (bufferlist, group_idx, 0);
if (!buffer)
return FALSE;
return gst_rtp_buffer_get_extension_onebyte_header (buffer, id, nth, data,
size);
}
/**
* gst_rtp_buffer_list_get_extension_twobytes_header:
* @bufferlist: the bufferlist
* @group_idx: The index of the group in the #GstBufferList
* @appbits: Application specific bits
* @id: The ID of the header extension to be read (between 1 and 14).
* @nth: Read the nth extension packet with the requested ID
* @data: location for data
* @size: the size of the data in bytes
*
* Parses RFC 5285 style header extensions with a two bytes header. It will
* return the nth extension with the requested id.
*
* Returns: TRUE if @buffer had the requested header extension
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_list_get_extension_twobytes_header (GstBufferList * bufferlist,
guint group_idx, guint8 * appbits, guint8 id, guint nth,
gpointer * data, guint * size)
{
GstBuffer *buffer;
buffer = gst_buffer_list_get (bufferlist, group_idx, 0);
if (!buffer)
return FALSE;
return gst_rtp_buffer_get_extension_twobytes_header (buffer, appbits, id,
nth, data, size);
}
/**
* gst_rtp_buffer_list_add_extension_onebyte_header:
* @it: a #GstBufferListIterator pointing right after the #GstBuffer where
* the header extension should be added
* @id: The ID of the header extension (between 1 and 14).
* @data: location for data
* @size: the size of the data in bytes
*
* Adds a RFC 5285 header extension with a one byte header to the end of the
* RTP header. If there is already a RFC 5285 header extension with a one byte
* header, the new extension will be appended.
* It will not work if there is already a header extension that does not follow
* the mecanism described in RFC 5285 or if there is a header extension with
* a two bytes header as described in RFC 5285. In that case, use
* gst_rtp_buffer_list_add_extension_twobytes_header()
*
* This function will not modify the data section of the RTP buffer, only
* the header.
*
* Returns: %TRUE if header extension could be added
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_list_add_extension_onebyte_header (GstBufferListIterator * it,
guint8 id, gpointer data, guint size)
{
GstBuffer *buffer;
guint16 bits;
guint8 *pdata;
guint wordlen;
gboolean retval;
guint endoffset = 0;
g_return_val_if_fail (gst_buffer_list_iterator_n_buffers (it) == 1, FALSE);
g_return_val_if_fail (id > 0 && id < 15, FALSE);
g_return_val_if_fail (size >= 1 && size <= 16, FALSE);
buffer = gst_buffer_list_iterator_steal (it);
if (GST_RTP_HEADER_EXTENSION (GST_BUFFER_DATA (buffer))) {
gst_rtp_buffer_get_extension_data (buffer, &bits, (gpointer) & pdata,
&wordlen);
if (bits != 0xBEDE)
return FALSE;
endoffset = get_onebyte_header_end_offset (pdata, wordlen);
if (endoffset == 0)
return FALSE;
endoffset += pdata - GST_BUFFER_DATA (buffer);
} else {
endoffset = GST_BUFFER_SIZE (buffer) + 4;
}
if (endoffset + size + 1 > GST_BUFFER_SIZE (buffer)) {
guint newsize;
GstBuffer *newbuffer;
newsize = endoffset + size + 1;
if (newsize % 4)
newsize += 4 - (newsize % 4);
newbuffer = gst_buffer_new_and_alloc (newsize);
memcpy (GST_BUFFER_DATA (newbuffer), GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer));
gst_buffer_copy_metadata (newbuffer, buffer, GST_BUFFER_COPY_ALL);
gst_buffer_unref (buffer);
buffer = newbuffer;
} else {
buffer = gst_buffer_make_writable (buffer);
}
retval = gst_rtp_buffer_add_extension_onebyte_header (buffer, id, data, size);
gst_buffer_list_iterator_take (it, buffer);
return retval;
}
/**
* gst_rtp_buffer_list_add_extension_twobytes_header:
* @it: a #GstBufferListIterator pointing right after the #GstBuffer where
* the header extension should be added
* @appbits: Application specific bits
* @id: The ID of the header extension
* @data: location for data
* @size: the size of the data in bytes
*
* Adds a RFC 5285 header extension with a two bytes header to the end of the
* RTP header. If there is already a RFC 5285 header extension with a two bytes
* header, the new extension will be appended.
* It will not work if there is already a header extension that does not follow
* the mecanism described in RFC 5285 or if there is a header extension with
* a one byte header as described in RFC 5285. In that case, use
* gst_rtp_buffer_add_extension_onebyte_header()
*
* This function will not modify the data section of the RTP buffer, only
* the header.
*
* Returns: %TRUE if header extension could be added
*
* Since: 0.10.31
*/
gboolean
gst_rtp_buffer_list_add_extension_twobytes_header (GstBufferListIterator * it,
guint8 appbits, guint8 id, gpointer data, guint size)
{
GstBuffer *buffer;
guint16 bits;
guint8 *pdata;
guint wordlen;
gboolean retval;
guint endoffset;
g_return_val_if_fail ((appbits & 0xF0) == 0, FALSE);
g_return_val_if_fail (size < 256, FALSE);
g_return_val_if_fail (gst_buffer_list_iterator_n_buffers (it) == 1, FALSE);
buffer = gst_buffer_list_iterator_steal (it);
if (GST_RTP_HEADER_EXTENSION (GST_BUFFER_DATA (buffer))) {
gst_rtp_buffer_get_extension_data (buffer, &bits, (gpointer) & pdata,
&wordlen);
if (bits != ((0x100 << 4) | (appbits & 0x0f)))
return FALSE;
endoffset = get_twobytes_header_end_offset (pdata, wordlen);
if (endoffset == 0)
return FALSE;
endoffset += pdata - GST_BUFFER_DATA (buffer);
} else {
endoffset = GST_BUFFER_SIZE (buffer) + 4;
}
if (endoffset + size + 2 > GST_BUFFER_SIZE (buffer)) {
guint newsize;
GstBuffer *newbuffer;
newsize = endoffset + size + 2;
if (newsize % 4)
newsize += 4 - newsize % 4;
newbuffer = gst_buffer_new_and_alloc (newsize);
memcpy (GST_BUFFER_DATA (newbuffer), GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer));
gst_buffer_copy_metadata (newbuffer, buffer, GST_BUFFER_COPY_ALL);
gst_buffer_unref (buffer);
buffer = newbuffer;
} else {
buffer = gst_buffer_make_writable (buffer);
}
retval = gst_rtp_buffer_add_extension_twobytes_header (buffer, appbits, id,
data, size);
gst_buffer_list_iterator_take (it, buffer);
return retval;
}
/**
* gst_rtp_buffer_list_from_buffer:
* @buffer: a #GstBuffer containing a RTP packet
*
* Splits a #GstBuffer into a #GstBufferList containing separate
* buffers for the header and data sections.
*
* Returns: a #GstBufferList
*/
GstBufferList *
gst_rtp_buffer_list_from_buffer (GstBuffer * buffer)
{
GstBufferList *bufferlist;
GstBuffer *sub;
GstBufferListIterator *it;
guint8 *payload;
bufferlist = gst_buffer_list_new ();
it = gst_buffer_list_iterate (bufferlist);
gst_buffer_list_iterator_add_group (it);
payload = gst_rtp_buffer_get_payload (buffer);
sub = gst_buffer_create_sub (buffer, 0, payload - GST_BUFFER_DATA (buffer));
gst_buffer_list_iterator_add (it, sub);
sub = gst_rtp_buffer_get_payload_buffer (buffer);
gst_buffer_list_iterator_add (it, sub);
gst_buffer_list_iterator_free (it);
return bufferlist;
}
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