ortp.h

   1 /*
   2  * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file ortp.h some macros used by ortp_send.c and ortp_recv.c*/
   8
   9 /** the possible packet types */
  10 enum ortp_audio_packet_type {ORTP_EOF, ORTP_BOF, ORTP_HEADER, ORTP_DATA};
  11
  12 /** number of bytes of the paraslash ortp header */
  13 #define ORTP_AUDIO_HEADER_LEN 10
  14
  15 /** write type of this packet to \a buf */
  16 #define WRITE_PACKET_TYPE(buf, x) (buf)[0] = (unsigned char)((x)&0xff)
  17 /** get type of this packet */
  18 #define READ_PACKET_TYPE(buf) (unsigned)(buf)[0]
  19
  20 /** write the chunk time for this packet to \a buf */
  21 #define WRITE_CHUNK_TIME(buf, x) (buf)[1] = (unsigned char)((x)&0xff);\
  22         (buf)[2] = (unsigned char)(((x)>>8)&0xff);\
  23         (buf)[3] = (unsigned char)(((x)>>16)&0xff);\
  24         (buf)[4] = (unsigned char)(((x)>>24)&0xff);
  25
  26 /** get the chunk time of this packet */
  27 #define READ_CHUNK_TIME(buf) (unsigned char)(buf)[1] + \
  28         ((unsigned char)(buf)[2] << 8) + \
  29         ((unsigned char)(buf)[3] << 16) + \
  30         ((unsigned char)(buf)[4] << 24)
  31
  32 /** write the chunk timestamp */
  33 #define WRITE_CHUNK_TS(buf, x) (buf)[5] = (unsigned char)((x) & 0xff); \
  34         (buf)[6] = (unsigned char)(((x >> 8) & 0xff));
  35 /** get the chunk timestamp */
  36 #define READ_CHUNK_TS(buf) (unsigned char)(buf)[5] + \
  37         ((unsigned char)(buf)[6] << 8)
  38
  39 /** write the stream type (header or headerless) */
  40 #define WRITE_STREAM_TYPE(buf, x) (buf)[7] = (unsigned char)((x)&0xff)
  41 /** get the type of the stream (header or headerless) */
  42 #define READ_STREAM_TYPE(buf) (unsigned)(buf)[7]
  43
  44 /** write the length of the header (only used for streams with header) */
  45 #define WRITE_HEADER_LEN(buf, x) (buf)[8] = (unsigned char)((x) & 0xff); \
  46         (buf)[9] = (unsigned char)(((x >> 8) & 0xff));
  47
  48 /** get the length of the header (only used for packets containing a header) */
  49 #define READ_HEADER_LEN(buf) (unsigned char)(buf)[8] + \
  50         ((unsigned char)(buf)[9] << 8)