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ffmpeg / libavformat / rtpdec.h @ 1537817e

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/*
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 * RTP demuxer definitions
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 * Copyright (c) 2002 Fabrice Bellard
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 * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_RTPDEC_H
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#define AVFORMAT_RTPDEC_H
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#include "libavcodec/avcodec.h"
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#include "avformat.h"
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#include "rtp.h"
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typedef struct PayloadContext PayloadContext;
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typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
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#define RTP_MIN_PACKET_LENGTH 12
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#define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
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#define RTP_NOTS_VALUE ((uint32_t)-1)
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typedef struct RTPDemuxContext RTPDemuxContext;
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RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type);
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void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
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                                    RTPDynamicProtocolHandler *handler);
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int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
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                     const uint8_t *buf, int len);
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void rtp_parse_close(RTPDemuxContext *s);
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#if (LIBAVFORMAT_VERSION_MAJOR <= 53)
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int rtp_get_local_port(URLContext *h);
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#endif
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int rtp_get_local_rtp_port(URLContext *h);
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int rtp_get_local_rtcp_port(URLContext *h);
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int rtp_set_remote_url(URLContext *h, const char *uri);
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#if (LIBAVFORMAT_VERSION_MAJOR <= 52)
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void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
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#endif
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/**
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 * Send a dummy packet on both port pairs to set up the connection
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 * state in potential NAT routers, so that we're able to receive
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 * packets.
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 *
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 * Note, this only works if the NAT router doesn't remap ports. This
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 * isn't a standardized procedure, but it works in many cases in practice.
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 *
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 * The same routine is used with RDT too, even if RDT doesn't use normal
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 * RTP packets otherwise.
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 */
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void rtp_send_punch_packets(URLContext* rtp_handle);
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/**
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 * some rtp servers assume client is dead if they don't hear from them...
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 * so we send a Receiver Report to the provided ByteIO context
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 * (we don't have access to the rtcp handle from here)
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 */
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int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
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// these statistics are used for rtcp receiver reports...
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typedef struct {
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    uint16_t max_seq;           ///< highest sequence number seen
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    uint32_t cycles;            ///< shifted count of sequence number cycles
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    uint32_t base_seq;          ///< base sequence number
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    uint32_t bad_seq;           ///< last bad sequence number + 1
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    int probation;              ///< sequence packets till source is valid
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    int received;               ///< packets received
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    int expected_prior;         ///< packets expected in last interval
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    int received_prior;         ///< packets received in last interval
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    uint32_t transit;           ///< relative transit time for previous packet
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    uint32_t jitter;            ///< estimated jitter.
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} RTPStatistics;
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#define RTP_FLAG_KEY    0x1 ///< RTP packet contains a keyframe
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#define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
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/**
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 * Packet parsing for "private" payloads in the RTP specs.
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 *
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 * @param ctx RTSP demuxer context
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 * @param s stream context
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 * @param st stream that this packet belongs to
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 * @param pkt packet in which to write the parsed data
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 * @param timestamp pointer in which to write the timestamp of this RTP packet
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 * @param buf pointer to raw RTP packet data
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 * @param len length of buf
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 * @param flags flags from the RTP packet header (RTP_FLAG_*)
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 */
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typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
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                                                PayloadContext *s,
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                                                AVStream *st,
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                                                AVPacket * pkt,
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                                                uint32_t *timestamp,
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                                                const uint8_t * buf,
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                                                int len, int flags);
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struct RTPDynamicProtocolHandler_s {
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    // fields from AVRtpDynamicPayloadType_s
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    const char enc_name[50];    /* XXX: still why 50 ? ;-) */
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    enum AVMediaType codec_type;
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    enum CodecID codec_id;
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    // may be null
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    int (*parse_sdp_a_line) (AVFormatContext *s,
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                             int st_index,
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                             PayloadContext *priv_data,
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                             const char *line); ///< Parse the a= line from the sdp field
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    PayloadContext *(*open) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
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    void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
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    DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
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    struct RTPDynamicProtocolHandler_s *next;
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};
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// moved out of rtp.c, because the h264 decoder needs to know about this structure..
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struct RTPDemuxContext {
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    AVFormatContext *ic;
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    AVStream *st;
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    int payload_type;
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    uint32_t ssrc;
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    uint16_t seq;
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    uint32_t timestamp;
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    uint32_t base_timestamp;
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    uint32_t cur_timestamp;
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    int64_t  range_start_offset;
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    int max_payload_size;
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    struct MpegTSContext *ts;   /* only used for MP2T payloads */
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    int read_buf_index;
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    int read_buf_size;
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    /* used to send back RTCP RR */
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    URLContext *rtp_ctx;
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    char hostname[256];
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    RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
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    /* rtcp sender statistics receive */
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    int64_t last_rtcp_ntp_time;    // TODO: move into statistics
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    int64_t first_rtcp_ntp_time;   // TODO: move into statistics
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    uint32_t last_rtcp_timestamp;  // TODO: move into statistics
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    /* rtcp sender statistics */
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    unsigned int packet_count;     // TODO: move into statistics (outgoing)
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    unsigned int octet_count;      // TODO: move into statistics (outgoing)
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    unsigned int last_octet_count; // TODO: move into statistics (outgoing)
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    int first_packet;
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    /* buffer for output */
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    uint8_t buf[RTP_MAX_PACKET_LENGTH];
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    uint8_t *buf_ptr;
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    /* dynamic payload stuff */
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    DynamicPayloadPacketHandlerProc parse_packet;     ///< This is also copied from the dynamic protocol handler structure
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    PayloadContext *dynamic_protocol_context;        ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
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    int max_frames_per_packet;
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};
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extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
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void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
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int ff_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.
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int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
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                  int (*parse_fmtp)(AVStream *stream,
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                                    PayloadContext *data,
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                                    char *attr, char *value));
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void av_register_rtp_dynamic_payload_handlers(void);
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#endif /* AVFORMAT_RTPDEC_H */