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2059 lines
52 KiB
C
2059 lines
52 KiB
C
/* GStreamer
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* Copyright (C) <2005> Philippe Khalaf <burger@speedy.org>
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* Copyright (C) <2006> Wim Taymans <wim@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstrtpbuffer
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* @short_description: Helper methods for dealing with RTP buffers
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* @see_also: #GstBaseRTPPayload, #GstBaseRTPDepayload, gstrtcpbuffer
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*
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* <refsect2>
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* <para>
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* The GstRTPBuffer helper functions makes it easy to parse and create regular
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* #GstBuffer objects that contain RTP payloads. These buffers are typically of
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* 'application/x-rtp' #GstCaps.
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* </para>
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* </refsect2>
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*
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* Last reviewed on 2006-07-17 (0.10.10)
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*/
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#include "gstrtpbuffer.h"
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#include <stdlib.h>
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#include <string.h>
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#define GST_RTP_HEADER_LEN 12
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/* Note: we use bitfields here to make sure the compiler doesn't add padding
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* between fields on certain architectures; can't assume aligned access either
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*/
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typedef struct _GstRTPHeader
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{
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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unsigned int csrc_count:4; /* CSRC count */
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unsigned int extension:1; /* header extension flag */
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unsigned int padding:1; /* padding flag */
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unsigned int version:2; /* protocol version */
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unsigned int payload_type:7; /* payload type */
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unsigned int marker:1; /* marker bit */
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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unsigned int version:2; /* protocol version */
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unsigned int padding:1; /* padding flag */
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unsigned int extension:1; /* header extension flag */
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unsigned int csrc_count:4; /* CSRC count */
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unsigned int marker:1; /* marker bit */
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unsigned int payload_type:7; /* payload type */
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#else
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#error "G_BYTE_ORDER should be big or little endian."
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#endif
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unsigned int seq:16; /* sequence number */
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unsigned int timestamp:32; /* timestamp */
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unsigned int ssrc:32; /* synchronization source */
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guint8 csrclist[4]; /* optional CSRC list, 32 bits each */
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} GstRTPHeader;
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#define GST_RTP_HEADER_VERSION(data) (((GstRTPHeader *)(data))->version)
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#define GST_RTP_HEADER_PADDING(data) (((GstRTPHeader *)(data))->padding)
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#define GST_RTP_HEADER_EXTENSION(data) (((GstRTPHeader *)(data))->extension)
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#define GST_RTP_HEADER_CSRC_COUNT(data) (((GstRTPHeader *)(data))->csrc_count)
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#define GST_RTP_HEADER_MARKER(data) (((GstRTPHeader *)(data))->marker)
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#define GST_RTP_HEADER_PAYLOAD_TYPE(data) (((GstRTPHeader *)(data))->payload_type)
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#define GST_RTP_HEADER_SEQ(data) (((GstRTPHeader *)(data))->seq)
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#define GST_RTP_HEADER_TIMESTAMP(data) (((GstRTPHeader *)(data))->timestamp)
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#define GST_RTP_HEADER_SSRC(data) (((GstRTPHeader *)(data))->ssrc)
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#define GST_RTP_HEADER_CSRC_LIST_OFFSET(data,i) \
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data + G_STRUCT_OFFSET(GstRTPHeader, csrclist) + \
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((i) * sizeof(guint32))
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#define GST_RTP_HEADER_CSRC_SIZE(data) (GST_RTP_HEADER_CSRC_COUNT(data) * sizeof (guint32))
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/**
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* gst_rtp_buffer_allocate_data:
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* @buffer: a #GstBuffer
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* @payload_len: the length of the payload
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* @pad_len: the amount of padding
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* @csrc_count: the number of CSRC entries
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*
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* Allocate enough data in @buffer to hold an RTP packet with @csrc_count CSRCs,
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* a payload length of @payload_len and padding of @pad_len.
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* MALLOCDATA of @buffer will be overwritten and will not be freed.
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* All other RTP header fields will be set to 0/FALSE.
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*/
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void
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gst_rtp_buffer_allocate_data (GstBuffer * buffer, guint payload_len,
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guint8 pad_len, guint8 csrc_count)
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{
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guint len;
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guint8 *data;
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g_return_if_fail (csrc_count <= 15);
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g_return_if_fail (GST_IS_BUFFER (buffer));
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len = GST_RTP_HEADER_LEN + csrc_count * sizeof (guint32)
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+ payload_len + pad_len;
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data = g_malloc (len);
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GST_BUFFER_MALLOCDATA (buffer) = data;
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GST_BUFFER_DATA (buffer) = data;
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GST_BUFFER_SIZE (buffer) = len;
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/* fill in defaults */
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GST_RTP_HEADER_VERSION (data) = GST_RTP_VERSION;
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GST_RTP_HEADER_PADDING (data) = FALSE;
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GST_RTP_HEADER_EXTENSION (data) = FALSE;
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GST_RTP_HEADER_CSRC_COUNT (data) = csrc_count;
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memset (GST_RTP_HEADER_CSRC_LIST_OFFSET (data, 0), 0,
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csrc_count * sizeof (guint32));
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GST_RTP_HEADER_MARKER (data) = FALSE;
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GST_RTP_HEADER_PAYLOAD_TYPE (data) = 0;
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GST_RTP_HEADER_SEQ (data) = 0;
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GST_RTP_HEADER_TIMESTAMP (data) = 0;
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GST_RTP_HEADER_SSRC (data) = 0;
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}
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/**
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* gst_rtp_buffer_new_take_data:
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* @data: data for the new buffer
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* @len: the length of data
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*
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* Create a new buffer and set the data and size of the buffer to @data and @len
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* respectively. @data will be freed when the buffer is unreffed, so this
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* function transfers ownership of @data to the new buffer.
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*
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* Returns: A newly allocated buffer with @data and of size @len.
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*/
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GstBuffer *
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gst_rtp_buffer_new_take_data (gpointer data, guint len)
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{
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GstBuffer *result;
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g_return_val_if_fail (data != NULL, NULL);
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g_return_val_if_fail (len > 0, NULL);
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result = gst_buffer_new ();
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GST_BUFFER_MALLOCDATA (result) = data;
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GST_BUFFER_DATA (result) = data;
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GST_BUFFER_SIZE (result) = len;
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return result;
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}
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/**
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* gst_rtp_buffer_new_copy_data:
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* @data: data for the new buffer
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* @len: the length of data
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*
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* Create a new buffer and set the data to a copy of @len
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* bytes of @data and the size to @len. The data will be freed when the buffer
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* is freed.
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*
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* Returns: A newly allocated buffer with a copy of @data and of size @len.
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*/
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GstBuffer *
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gst_rtp_buffer_new_copy_data (gpointer data, guint len)
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{
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return gst_rtp_buffer_new_take_data (g_memdup (data, len), len);
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}
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/**
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* gst_rtp_buffer_new_allocate:
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* @payload_len: the length of the payload
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* @pad_len: the amount of padding
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* @csrc_count: the number of CSRC entries
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*
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* Allocate a new #GstBuffer with enough data to hold an RTP packet with
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* @csrc_count CSRCs, a payload length of @payload_len and padding of @pad_len.
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* All other RTP header fields will be set to 0/FALSE.
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*
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* Returns: A newly allocated buffer that can hold an RTP packet with given
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* parameters.
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*/
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GstBuffer *
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gst_rtp_buffer_new_allocate (guint payload_len, guint8 pad_len,
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guint8 csrc_count)
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{
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GstBuffer *result;
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g_return_val_if_fail (csrc_count <= 15, NULL);
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result = gst_buffer_new ();
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gst_rtp_buffer_allocate_data (result, payload_len, pad_len, csrc_count);
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return result;
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}
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/**
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* gst_rtp_buffer_new_allocate_len:
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* @packet_len: the total length of the packet
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* @pad_len: the amount of padding
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* @csrc_count: the number of CSRC entries
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*
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* Create a new #GstBuffer that can hold an RTP packet that is exactly
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* @packet_len long. The length of the payload depends on @pad_len and
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* @csrc_count and can be calculated with gst_rtp_buffer_calc_payload_len().
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* All RTP header fields will be set to 0/FALSE.
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*
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* Returns: A newly allocated buffer that can hold an RTP packet of @packet_len.
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*/
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GstBuffer *
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gst_rtp_buffer_new_allocate_len (guint packet_len, guint8 pad_len,
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guint8 csrc_count)
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{
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guint len;
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g_return_val_if_fail (csrc_count <= 15, NULL);
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len = gst_rtp_buffer_calc_payload_len (packet_len, pad_len, csrc_count);
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return gst_rtp_buffer_new_allocate (len, pad_len, csrc_count);
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}
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/**
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* gst_rtp_buffer_calc_header_len:
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* @csrc_count: the number of CSRC entries
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*
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* Calculate the header length of an RTP packet with @csrc_count CSRC entries.
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* An RTP packet can have at most 15 CSRC entries.
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*
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* Returns: The length of an RTP header with @csrc_count CSRC entries.
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*/
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guint
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gst_rtp_buffer_calc_header_len (guint8 csrc_count)
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{
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g_return_val_if_fail (csrc_count <= 15, 0);
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return GST_RTP_HEADER_LEN + (csrc_count * sizeof (guint32));
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}
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/**
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* gst_rtp_buffer_calc_packet_len:
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* @payload_len: the length of the payload
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* @pad_len: the amount of padding
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* @csrc_count: the number of CSRC entries
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*
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* Calculate the total length of an RTP packet with a payload size of @payload_len,
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* a padding of @pad_len and a @csrc_count CSRC entries.
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*
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* Returns: The total length of an RTP header with given parameters.
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*/
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guint
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gst_rtp_buffer_calc_packet_len (guint payload_len, guint8 pad_len,
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guint8 csrc_count)
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{
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g_return_val_if_fail (csrc_count <= 15, 0);
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return payload_len + GST_RTP_HEADER_LEN + (csrc_count * sizeof (guint32))
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+ pad_len;
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}
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/**
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* gst_rtp_buffer_calc_payload_len:
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* @packet_len: the length of the total RTP packet
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* @pad_len: the amount of padding
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* @csrc_count: the number of CSRC entries
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*
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* Calculate the length of the payload of an RTP packet with size @packet_len,
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* a padding of @pad_len and a @csrc_count CSRC entries.
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*
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* Returns: The length of the payload of an RTP packet with given parameters.
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*/
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guint
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gst_rtp_buffer_calc_payload_len (guint packet_len, guint8 pad_len,
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guint8 csrc_count)
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{
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g_return_val_if_fail (csrc_count <= 15, 0);
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return packet_len - GST_RTP_HEADER_LEN - (csrc_count * sizeof (guint32))
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- pad_len;
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}
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/**
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* validate_data:
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* @data: the data to validate
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* @len: the length of @data to validate
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* @payload: the payload if @data represents the header only
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* @payload_len: the len of the payload
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*
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* Checks if @data is a valid RTP packet.
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*
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* Returns: TRUE if @data is a valid RTP packet
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*/
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static gboolean
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validate_data (guint8 * data, guint len, guint8 * payload, guint payload_len)
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{
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guint8 padding;
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guint8 csrc_count;
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guint header_len;
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guint8 version;
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g_return_val_if_fail (data != NULL, FALSE);
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header_len = GST_RTP_HEADER_LEN;
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if (G_UNLIKELY (len < header_len))
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goto wrong_length;
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/* check version */
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version = (data[0] & 0xc0);
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if (G_UNLIKELY (version != (GST_RTP_VERSION << 6)))
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goto wrong_version;
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/* calc header length with csrc */
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csrc_count = (data[0] & 0x0f);
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header_len += csrc_count * sizeof (guint32);
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/* calc extension length when present. */
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if (data[0] & 0x10) {
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guint8 *extpos;
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guint16 extlen;
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/* this points to the extenstion bits and header length */
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extpos = &data[header_len];
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/* skip the header and check that we have enough space */
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header_len += 4;
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if (G_UNLIKELY (len < header_len))
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goto wrong_length;
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/* skip id */
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extpos += 2;
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/* read length as the number of 32 bits words */
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extlen = GST_READ_UINT16_BE (extpos);
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header_len += extlen * sizeof (guint32);
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}
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/* check for padding */
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if (data[0] & 0x20) {
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if (payload)
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padding = payload[payload_len - 1];
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else
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padding = data[len - 1];
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} else {
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padding = 0;
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}
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/* check if padding and header not bigger than packet length */
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if (G_UNLIKELY (len < padding + header_len))
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goto wrong_padding;
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return TRUE;
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/* ERRORS */
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wrong_length:
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{
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GST_DEBUG ("len < header_len check failed (%d < %d)", len, header_len);
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goto dump_packet;
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}
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wrong_version:
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{
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GST_DEBUG ("version check failed (%d != %d)", version, GST_RTP_VERSION);
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goto dump_packet;
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}
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wrong_padding:
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{
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GST_DEBUG ("padding check failed (%d - %d < %d)", len, header_len, padding);
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goto dump_packet;
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}
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dump_packet:
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{
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GST_MEMDUMP ("buffer", data, len);
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return FALSE;
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}
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}
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/**
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* gst_rtp_buffer_validate_data:
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* @data: the data to validate
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* @len: the length of @data to validate
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*
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* Check if the @data and @size point to the data of a valid RTP packet.
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* This function checks the length, version and padding of the packet data.
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* Use this function to validate a packet before using the other functions in
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* this module.
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*
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* Returns: TRUE if the data points to a valid RTP packet.
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*/
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gboolean
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gst_rtp_buffer_validate_data (guint8 * data, guint len)
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{
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return validate_data (data, len, NULL, 0);
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}
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|
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/**
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* gst_rtp_buffer_validate:
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* @buffer: the buffer to validate
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*
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* Check if the data pointed to by @buffer is a valid RTP packet using
|
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* validate_data().
|
|
* Use this function to validate a packet before using the other functions in
|
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* this module.
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*
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* Returns: TRUE if @buffer is a valid RTP packet.
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*/
|
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gboolean
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gst_rtp_buffer_validate (GstBuffer * buffer)
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{
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guint8 *data;
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guint len;
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g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
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|
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data = GST_BUFFER_DATA (buffer);
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len = GST_BUFFER_SIZE (buffer);
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return validate_data (data, len, NULL, 0);
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}
|
|
|
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/**
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|
* gst_rtp_buffer_list_validate:
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* @list: the buffer list to validate
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*
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* Check if all RTP packets in the @list are valid using validate_data().
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* Use this function to validate an list before using the other functions in
|
|
* this module.
|
|
*
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* Returns: TRUE if @list consists only of valid RTP packets.
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*
|
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* Since: 0.10.24
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*/
|
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gboolean
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gst_rtp_buffer_list_validate (GstBufferList * list)
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{
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guint16 prev_seqnum = 0;
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GstBufferListIterator *it;
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guint i = 0;
|
|
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g_return_val_if_fail (GST_IS_BUFFER_LIST (list), FALSE);
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|
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it = gst_buffer_list_iterate (list);
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g_return_val_if_fail (it != NULL, FALSE);
|
|
|
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/* iterate through all the RTP packets in the list */
|
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while (gst_buffer_list_iterator_next_group (it)) {
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GstBuffer *rtpbuf;
|
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GstBuffer *paybuf;
|
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guint8 *packet_header;
|
|
guint8 *packet_payload;
|
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guint payload_size;
|
|
guint packet_size;
|
|
|
|
/* each group should consists of 2 buffers: one containing the RTP header
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|
* and the other one the payload, FIXME, relax the requirement of only one
|
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* payload buffer. */
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if (gst_buffer_list_iterator_n_buffers (it) != 2)
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goto invalid_list;
|
|
|
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/* get the RTP header */
|
|
rtpbuf = gst_buffer_list_iterator_next (it);
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packet_header = GST_BUFFER_DATA (rtpbuf);
|
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if (packet_header == NULL)
|
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goto invalid_list;
|
|
|
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/* get the payload */
|
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paybuf = gst_buffer_list_iterator_next (it);
|
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packet_payload = GST_BUFFER_DATA (paybuf);
|
|
if (packet_payload == NULL) {
|
|
goto invalid_list;
|
|
}
|
|
payload_size = GST_BUFFER_SIZE (paybuf);
|
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if (payload_size == 0) {
|
|
goto invalid_list;
|
|
}
|
|
|
|
/* the size of the RTP packet within the current group */
|
|
packet_size = GST_BUFFER_SIZE (rtpbuf) + payload_size;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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,
|
|
×tamp);
|
|
}
|
|
|
|
/**
|
|
* 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 + 1) / 4 + (((size + 1) % 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;
|
|
}
|