1 /* GStreamer plugin for forward error correction 2 * Copyright (C) 2017 Pexip 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 * 18 * Author: Mikhail Fludkov <misha@pexip.com> 19 */ 20 21 #ifndef __RTP_RED_COMMON_H__ 22 #define __RTP_RED_COMMON_H__ 23 24 #include <glib.h> 25 26 G_BEGIN_DECLS 27 28 typedef struct _RedBlockHeader RedBlockHeader; 29 30 /* RFC 2198 */ 31 /* 32 0 1 2 3 33 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 34 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 35 |F| block PT | timestamp offset | block length | 36 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 37 */ 38 39 struct _RedBlockHeader { 40 #if G_BYTE_ORDER == G_LITTLE_ENDIAN 41 guint pt:7; 42 guint F:1; 43 44 guint timestamp_offset_hi: 8; 45 46 guint length_hi: 2; 47 guint timestamp_offset_lo: 6; 48 49 guint length_lo: 8; 50 #elif G_BYTE_ORDER == G_BIG_ENDIAN 51 guint F:1; 52 guint pt:7; 53 54 guint timestamp_offset_hi: 8; 55 56 guint timestamp_offset_lo: 6; 57 guint length_hi: 2; 58 59 guint length_lo: 8; 60 #else 61 #error "G_BYTE_ORDER should be big or little endian." 62 #endif 63 }; 64 65 #define RED_BLOCK_TIMESTAMP_OFFSET_MAX ((1<<14) - 1) 66 #define RED_BLOCK_LENGTH_MAX ((1<<10) - 1) 67 68 gsize rtp_red_block_header_get_length (gboolean is_redundant); 69 gboolean rtp_red_block_is_redundant (gpointer red_block); 70 void rtp_red_block_set_payload_type (gpointer red_block, guint8 pt); 71 void rtp_red_block_set_timestamp_offset (gpointer red_block, guint16 timestamp_offset); 72 void rtp_red_block_set_payload_length (gpointer red_block, guint16 length); 73 guint16 rtp_red_block_get_timestamp_offset (gpointer red_block); 74 guint8 rtp_red_block_get_payload_type (gpointer red_block); 75 void rtp_red_block_set_is_redundant (gpointer red_block, gboolean is_redundant); 76 guint16 rtp_red_block_get_payload_length (gpointer red_block); 77 78 G_END_DECLS 79 80 #endif 81