rtpdec.h 8.8 KB

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  1. /*
  2. * RTP demuxer definitions
  3. * Copyright (c) 2002 Fabrice Bellard
  4. * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
  5. *
  6. * This file is part of FFmpeg.
  7. *
  8. * FFmpeg is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU Lesser General Public
  10. * License as published by the Free Software Foundation; either
  11. * version 2.1 of the License, or (at your option) any later version.
  12. *
  13. * FFmpeg is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16. * Lesser General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU Lesser General Public
  19. * License along with FFmpeg; if not, write to the Free Software
  20. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21. */
  22. #ifndef AVFORMAT_RTPDEC_H
  23. #define AVFORMAT_RTPDEC_H
  24. #include "libavcodec/avcodec.h"
  25. #include "avformat.h"
  26. #include "rtp.h"
  27. #include "url.h"
  28. typedef struct PayloadContext PayloadContext;
  29. typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
  30. #define RTP_MIN_PACKET_LENGTH 12
  31. #define RTP_MAX_PACKET_LENGTH 1500 /* XXX: suppress this define */
  32. #define RTP_REORDER_QUEUE_DEFAULT_SIZE 10
  33. #define RTP_NOTS_VALUE ((uint32_t)-1)
  34. typedef struct RTPDemuxContext RTPDemuxContext;
  35. RTPDemuxContext *ff_rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, int queue_size);
  36. void ff_rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
  37. RTPDynamicProtocolHandler *handler);
  38. int ff_rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
  39. uint8_t **buf, int len);
  40. void ff_rtp_parse_close(RTPDemuxContext *s);
  41. int64_t ff_rtp_queued_packet_time(RTPDemuxContext *s);
  42. void ff_rtp_reset_packet_queue(RTPDemuxContext *s);
  43. int ff_rtp_get_local_rtp_port(URLContext *h);
  44. int ff_rtp_get_local_rtcp_port(URLContext *h);
  45. int ff_rtp_set_remote_url(URLContext *h, const char *uri);
  46. /**
  47. * Send a dummy packet on both port pairs to set up the connection
  48. * state in potential NAT routers, so that we're able to receive
  49. * packets.
  50. *
  51. * Note, this only works if the NAT router doesn't remap ports. This
  52. * isn't a standardized procedure, but it works in many cases in practice.
  53. *
  54. * The same routine is used with RDT too, even if RDT doesn't use normal
  55. * RTP packets otherwise.
  56. */
  57. void ff_rtp_send_punch_packets(URLContext* rtp_handle);
  58. /**
  59. * some rtp servers assume client is dead if they don't hear from them...
  60. * so we send a Receiver Report to the provided ByteIO context
  61. * (we don't have access to the rtcp handle from here)
  62. */
  63. int ff_rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
  64. /**
  65. * Get the file handle for the RTCP socket.
  66. */
  67. int ff_rtp_get_rtcp_file_handle(URLContext *h);
  68. // these statistics are used for rtcp receiver reports...
  69. typedef struct {
  70. uint16_t max_seq; ///< highest sequence number seen
  71. uint32_t cycles; ///< shifted count of sequence number cycles
  72. uint32_t base_seq; ///< base sequence number
  73. uint32_t bad_seq; ///< last bad sequence number + 1
  74. int probation; ///< sequence packets till source is valid
  75. int received; ///< packets received
  76. int expected_prior; ///< packets expected in last interval
  77. int received_prior; ///< packets received in last interval
  78. uint32_t transit; ///< relative transit time for previous packet
  79. uint32_t jitter; ///< estimated jitter.
  80. } RTPStatistics;
  81. #define RTP_FLAG_KEY 0x1 ///< RTP packet contains a keyframe
  82. #define RTP_FLAG_MARKER 0x2 ///< RTP marker bit was set for this packet
  83. /**
  84. * Packet parsing for "private" payloads in the RTP specs.
  85. *
  86. * @param ctx RTSP demuxer context
  87. * @param s stream context
  88. * @param st stream that this packet belongs to
  89. * @param pkt packet in which to write the parsed data
  90. * @param timestamp pointer in which to write the timestamp of this RTP packet
  91. * @param buf pointer to raw RTP packet data
  92. * @param len length of buf
  93. * @param flags flags from the RTP packet header (RTP_FLAG_*)
  94. */
  95. typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
  96. PayloadContext *s,
  97. AVStream *st,
  98. AVPacket * pkt,
  99. uint32_t *timestamp,
  100. const uint8_t * buf,
  101. int len, int flags);
  102. struct RTPDynamicProtocolHandler_s {
  103. // fields from AVRtpDynamicPayloadType_s
  104. const char enc_name[50]; /* XXX: still why 50 ? ;-) */
  105. enum AVMediaType codec_type;
  106. enum CodecID codec_id;
  107. int static_payload_id; /* 0 means no payload id is set. 0 is a valid
  108. * payload ID (PCMU), too, but that format doesn't
  109. * require any custom depacketization code. */
  110. // may be null
  111. int (*init)(AVFormatContext *s, int st_index, PayloadContext *priv_data); ///< Initialize dynamic protocol handler, called after the full rtpmap line is parsed
  112. int (*parse_sdp_a_line) (AVFormatContext *s,
  113. int st_index,
  114. PayloadContext *priv_data,
  115. const char *line); ///< Parse the a= line from the sdp field
  116. PayloadContext *(*alloc) (void); ///< allocate any data needed by the rtp parsing for this dynamic data.
  117. void (*free)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
  118. DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
  119. struct RTPDynamicProtocolHandler_s *next;
  120. };
  121. typedef struct RTPPacket {
  122. uint16_t seq;
  123. uint8_t *buf;
  124. int len;
  125. int64_t recvtime;
  126. struct RTPPacket *next;
  127. } RTPPacket;
  128. // moved out of rtp.c, because the h264 decoder needs to know about this structure..
  129. struct RTPDemuxContext {
  130. AVFormatContext *ic;
  131. AVStream *st;
  132. int payload_type;
  133. uint32_t ssrc;
  134. uint16_t seq;
  135. uint32_t timestamp;
  136. uint32_t base_timestamp;
  137. uint32_t cur_timestamp;
  138. int64_t unwrapped_timestamp;
  139. int64_t range_start_offset;
  140. int max_payload_size;
  141. struct MpegTSContext *ts; /* only used for MP2T payloads */
  142. int read_buf_index;
  143. int read_buf_size;
  144. /* used to send back RTCP RR */
  145. URLContext *rtp_ctx;
  146. char hostname[256];
  147. RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
  148. /** Fields for packet reordering @{ */
  149. int prev_ret; ///< The return value of the actual parsing of the previous packet
  150. RTPPacket* queue; ///< A sorted queue of buffered packets not yet returned
  151. int queue_len; ///< The number of packets in queue
  152. int queue_size; ///< The size of queue, or 0 if reordering is disabled
  153. /*@}*/
  154. /* rtcp sender statistics receive */
  155. int64_t last_rtcp_ntp_time; // TODO: move into statistics
  156. int64_t first_rtcp_ntp_time; // TODO: move into statistics
  157. uint32_t last_rtcp_timestamp; // TODO: move into statistics
  158. int64_t rtcp_ts_offset;
  159. /* rtcp sender statistics */
  160. unsigned int packet_count; // TODO: move into statistics (outgoing)
  161. unsigned int octet_count; // TODO: move into statistics (outgoing)
  162. unsigned int last_octet_count; // TODO: move into statistics (outgoing)
  163. int first_packet;
  164. /* buffer for output */
  165. uint8_t buf[RTP_MAX_PACKET_LENGTH];
  166. uint8_t *buf_ptr;
  167. /* dynamic payload stuff */
  168. DynamicPayloadPacketHandlerProc parse_packet; ///< This is also copied from the dynamic protocol handler structure
  169. PayloadContext *dynamic_protocol_context; ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
  170. int max_frames_per_packet;
  171. };
  172. void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
  173. RTPDynamicProtocolHandler *ff_rtp_handler_find_by_name(const char *name,
  174. enum AVMediaType codec_type);
  175. RTPDynamicProtocolHandler *ff_rtp_handler_find_by_id(int id,
  176. enum AVMediaType codec_type);
  177. 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.
  178. int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
  179. int (*parse_fmtp)(AVStream *stream,
  180. PayloadContext *data,
  181. char *attr, char *value));
  182. void av_register_rtp_dynamic_payload_handlers(void);
  183. #endif /* AVFORMAT_RTPDEC_H */