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n3.4.14
libavformat/rtpdec.h
219 строк
9 KB
Hendrik Leppkes
Merge commit '3c525b8b4770c1ac5f466a12c5523802bd5d40eb'
16 сен 2015, 15:07
16 сен 2015, 15:07
7cecab2
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/* * RTP demuxer definitions * Copyright (c) 2002 Fabrice Bellard * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFORMAT_RTPDEC_H #define AVFORMAT_RTPDEC_H #include "libavcodec/avcodec.h" #include "avformat.h" #include "rtp.h" #include "url.h" #include "srtp.h" typedef struct PayloadContext PayloadContext; typedef struct RTPDynamicProtocolHandler RTPDynamicProtocolHandler; #define RTP_MIN_PACKET_LENGTH 12 #define RTP_MAX_PACKET_LENGTH 8192 #define RTP_REORDER_QUEUE_DEFAULT_SIZE 500 #define RTP_NOTS_VALUE ((uint32_t)-1) typedef struct RTPDemuxContext RTPDemuxContext; RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, int payload_type, int queue_size); void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx, RTPDynamicProtocolHandler *handler); void ff_rtp_parse_set_crypto(RTPDemuxContext *s, const char *suite, const char *params); int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt, uint8_t **buf, int len); void ff_rtp_parse_close(RTPDemuxContext *s); int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s); void ff_rtp_reset_packet_queue(RTPDemuxContext *s); /** * Send a dummy packet on both port pairs to set up the connection * state in potential NAT routers, so that we're able to receive * packets. * * Note, this only works if the NAT router doesn't remap ports. This * isn't a standardized procedure, but it works in many cases in practice. * * The same routine is used with RDT too, even if RDT doesn't use normal * RTP packets otherwise. */ void ff_rtp_send_punch_packets(URLContext* rtp_handle); /** * some rtp servers assume client is dead if they don't hear from them... * so we send a Receiver Report to the provided URLContext or AVIOContext * (we don't have access to the rtcp handle from here) */ int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, URLContext *fd, AVIOContext *avio, int count); int ff_rtp_send_rtcp_feedback(RTPDemuxContext *s, URLContext *fd, AVIOContext *avio); // these statistics are used for rtcp receiver reports... typedef struct RTPStatistics { uint16_t max_seq; ///< highest sequence number seen uint32_t cycles; ///< shifted count of sequence number cycles uint32_t base_seq; ///< base sequence number uint32_t bad_seq; ///< last bad sequence number + 1 int probation; ///< sequence packets till source is valid uint32_t received; ///< packets received uint32_t expected_prior; ///< packets expected in last interval uint32_t received_prior; ///< packets received in last interval uint32_t transit; ///< relative transit time for previous packet uint32_t jitter; ///< estimated jitter. } RTPStatistics; #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet /** * Packet parsing for "private" payloads in the RTP specs. * * @param ctx RTSP demuxer context * @param s stream context * @param st stream that this packet belongs to * @param pkt packet in which to write the parsed data * @param timestamp pointer to the RTP timestamp of the input data, can be * updated by the function if returning older, buffered data * @param buf pointer to raw RTP packet data * @param len length of buf * @param seq RTP sequence number of the packet * @param flags flags from the RTP packet header (RTP_FLAG_*) */ typedef int (*DynamicPayloadPacketHandlerProc)(AVFormatContext *ctx, PayloadContext *s, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t * buf, int len, uint16_t seq, int flags); struct RTPDynamicProtocolHandler { const char *enc_name; enum AVMediaType codec_type; enum AVCodecID codec_id; enum AVStreamParseType need_parsing; int static_payload_id; /* 0 means no payload id is set. 0 is a valid * payload ID (PCMU), too, but that format doesn't * require any custom depacketization code. */ int priv_data_size; /** Initialize dynamic protocol handler, called after the full rtpmap line is parsed, may be null */ int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); /** Parse the a= line from the sdp field */ int (*parse_sdp_a_line)(AVFormatContext *s, int st_index, PayloadContext *priv_data, const char *line); /** Free any data needed by the rtp parsing for this dynamic data. * Don't free the protocol_data pointer itself, that is freed by the * caller. This is called even if the init method failed. */ void (*close)(PayloadContext *protocol_data); /** Parse handler for this dynamic packet */ DynamicPayloadPacketHandlerProc parse_packet; int (*need_keyframe)(PayloadContext *context); struct RTPDynamicProtocolHandler *next; }; typedef struct RTPPacket { uint16_t seq; uint8_t *buf; int len; int64_t recvtime; struct RTPPacket *next; } RTPPacket; struct RTPDemuxContext { AVFormatContext *ic; AVStream *st; int payload_type; uint32_t ssrc; uint16_t seq; uint32_t timestamp; uint32_t base_timestamp; uint32_t cur_timestamp; int64_t unwrapped_timestamp; int64_t range_start_offset; int max_payload_size; /* used to send back RTCP RR */ char hostname[256]; int srtp_enabled; struct SRTPContext srtp; /** Statistics for this stream (used by RTCP receiver reports) */ RTPStatistics statistics; /** Fields for packet reordering @{ */ int prev_ret; ///< The return value of the actual parsing of the previous packet RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned int queue_len; ///< The number of packets in queue int queue_size; ///< The size of queue, or 0 if reordering is disabled /*@}*/ /* rtcp sender statistics receive */ uint64_t last_rtcp_ntp_time; int64_t last_rtcp_reception_time; uint64_t first_rtcp_ntp_time; uint32_t last_rtcp_timestamp; int64_t rtcp_ts_offset; /* rtcp sender statistics */ unsigned int packet_count; unsigned int octet_count; unsigned int last_octet_count; int64_t last_feedback_time; /* dynamic payload stuff */ const RTPDynamicProtocolHandler *handler; PayloadContext *dynamic_protocol_context; }; void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler); RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name, enum AVMediaType codec_type); RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id, enum AVMediaType codec_type); /* from rtsp.c, but used by rtp dynamic protocol handlers. */ int ff_rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size); int ff_parse_fmtp(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *p, int (*parse_fmtp)(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *attr, const char *value)); void ff_register_rtp_dynamic_payload_handlers(void); /** * Close the dynamic buffer and make a packet from it. */ int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx); #endif /* AVFORMAT_RTPDEC_H */