libavformat/rtp_internal.h

   1 /*
   2  * RTP definitions
   3  * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 // this is a bit of a misnomer, because rtp & rtsp internal structures and prototypes are in here.
  23 #ifndef AVFORMAT_RTP_INTERNAL_H
  24 #define AVFORMAT_RTP_INTERNAL_H
  25
  26 #include <stdint.h>
  27 #include "libavcodec/avcodec.h"
  28 #include "rtp.h"
  29
  30 // these statistics are used for rtcp receiver reports...
  31 typedef struct {
  32     uint16_t max_seq;           ///< highest sequence number seen
  33     uint32_t cycles;            ///< shifted count of sequence number cycles
  34     uint32_t base_seq;          ///< base sequence number
  35     uint32_t bad_seq;           ///< last bad sequence number + 1
  36     int probation;              ///< sequence packets till source is valid
  37     int received;               ///< packets received
  38     int expected_prior;         ///< packets expected in last interval
  39     int received_prior;         ///< packets received in last interval
  40     uint32_t transit;           ///< relative transit time for previous packet
  41     uint32_t jitter;            ///< estimated jitter.
  42 } RTPStatistics;
  43
  44 /**
  45  * Packet parsing for "private" payloads in the RTP specs.
  46  *
  47  * @param s stream context
  48  * @param st stream that this packet belongs to
  49  * @param pkt packet in which to write the parsed data
  50  * @param timestamp pointer in which to write the timestamp of this RTP packet
  51  * @param buf pointer to raw RTP packet data
  52  * @param len length of buf
  53  * @param flags flags from the RTP packet header (PKT_FLAG_*)
  54  */
  55 typedef int (*DynamicPayloadPacketHandlerProc) (PayloadContext *s,
  56                                                 AVStream *st,
  57                                                 AVPacket * pkt,
  58                                                 uint32_t *timestamp,
  59                                                 const uint8_t * buf,
  60                                                 int len, int flags);
  61
  62 struct RTPDynamicProtocolHandler_s {
  63     // fields from AVRtpDynamicPayloadType_s
  64     const char enc_name[50];    /* XXX: still why 50 ? ;-) */
  65     enum CodecType codec_type;
  66     enum CodecID codec_id;
  67
  68     // may be null
  69     int (*parse_sdp_a_line) (AVStream * stream,
  70                              PayloadContext *priv_data,
  71                              const char *line); ///< Parse the a= line from the sdp field
  72     PayloadContext *(*open) (); ///< allocate any data needed by the rtp parsing for this dynamic data.
  73     void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
  74     DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
  75
  76     struct RTPDynamicProtocolHandler_s *next;
  77 };
  78
  79 // moved out of rtp.c, because the h264 decoder needs to know about this structure..
  80 struct RTPDemuxContext {
  81     AVFormatContext *ic;
  82     AVStream *st;
  83     int payload_type;
  84     uint32_t ssrc;
  85     uint16_t seq;
  86     uint32_t timestamp;
  87     uint32_t base_timestamp;
  88     uint32_t cur_timestamp;
  89     int max_payload_size;
  90     struct MpegTSContext *ts;   /* only used for MP2T payloads */
  91     int read_buf_index;
  92     int read_buf_size;
  93     /* used to send back RTCP RR */
  94     URLContext *rtp_ctx;
  95     char hostname[256];
  96
  97     RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
  98
  99     /* rtcp sender statistics receive */
 100     int64_t last_rtcp_ntp_time;    // TODO: move into statistics
 101     int64_t first_rtcp_ntp_time;   // TODO: move into statistics
 102     uint32_t last_rtcp_timestamp;  // TODO: move into statistics
 103
 104     /* rtcp sender statistics */
 105     unsigned int packet_count;     // TODO: move into statistics (outgoing)
 106     unsigned int octet_count;      // TODO: move into statistics (outgoing)
 107     unsigned int last_octet_count; // TODO: move into statistics (outgoing)
 108     int first_packet;
 109     /* buffer for output */
 110     uint8_t buf[RTP_MAX_PACKET_LENGTH];
 111     uint8_t *buf_ptr;
 112
 113     /* special infos for au headers parsing */
 114     rtp_payload_data_t *rtp_payload_data; // TODO: Move into dynamic payload handlers
 115
 116     /* dynamic payload stuff */
 117     DynamicPayloadPacketHandlerProc parse_packet;     ///< This is also copied from the dynamic protocol handler structure
 118     PayloadContext *dynamic_protocol_context;        ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
 119     int max_frames_per_packet;
 120 };
 121
 122 extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
 123 void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
 124
 125 int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size); ///< from rtsp.c, but used by rtp dynamic protocol handlers.
 126
 127 void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);
 128 const char *ff_rtp_enc_name(int payload_type);
 129 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type);
 130
 131 void av_register_rtp_dynamic_payload_handlers(void);
 132
 133 #endif /* AVFORMAT_RTP_INTERNAL_H */
 134