PeerStreamer

/*

 * RTP definitions

 * 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

 */

// this is a bit of a misnomer, because rtp & rtsp internal structures and prototypes are in here.

#ifndef FFMPEG_RTP_INTERNAL_H

#define FFMPEG_RTP_INTERNAL_H

#include <stdint.h>

#include "avcodec.h"

#include "rtp.h"

// these statistics are used for rtcp receiver reports...

typedef struct {

    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

    int received;               ///< packets received

    int expected_prior;         ///< packets expected in last interval

    int received_prior;         ///< packets received in last interval

    uint32_t transit;           ///< relative transit time for previous packet

    uint32_t jitter;            ///< estimated jitter.

} RTPStatistics;

typedef int (*DynamicPayloadPacketHandlerProc) (struct RTPDemuxContext * s,

                                                AVPacket * pkt,

                                                uint32_t *timestamp,

                                                const uint8_t * buf,

                                                int len);

typedef struct RTPDynamicProtocolHandler_s {

    // fields from AVRtpDynamicPayloadType_s

    const char enc_name[50];    /* XXX: still why 50 ? ;-) */

    enum CodecType codec_type;

    enum CodecID codec_id;

    // may be null

    int (*parse_sdp_a_line) (AVStream * stream,

                             void *protocol_data,

                             const char *line); ///< Parse the a= line from the sdp field

    void *(*open) (); ///< allocate any data needed by the rtp parsing for this dynamic data.

    void (*close)(void *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.

    DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.

    struct RTPDynamicProtocolHandler_s *next;

} RTPDynamicProtocolHandler;

// moved out of rtp.c, because the h264 decoder needs to know about this structure..

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;

    int max_payload_size;

    struct MpegTSContext *ts;   /* only used for MP2T payloads */

    int read_buf_index;

    int read_buf_size;

    /* used to send back RTCP RR */

    URLContext *rtp_ctx;

    char hostname[256];

    RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)

    /* rtcp sender statistics receive */

    int64_t last_rtcp_ntp_time;    // TODO: move into statistics

    int64_t first_rtcp_ntp_time;   // TODO: move into statistics

    uint32_t last_rtcp_timestamp;  // TODO: move into statistics

    /* rtcp sender statistics */

    unsigned int packet_count;     // TODO: move into statistics (outgoing)

    unsigned int octet_count;      // TODO: move into statistics (outgoing)

    unsigned int last_octet_count; // TODO: move into statistics (outgoing)

    int first_packet;

    /* buffer for output */

    uint8_t buf[RTP_MAX_PACKET_LENGTH];

    uint8_t *buf_ptr;

    /* special infos for au headers parsing */

    rtp_payload_data_t *rtp_payload_data; // TODO: Move into dynamic payload handlers

    /* dynamic payload stuff */

    DynamicPayloadPacketHandlerProc parse_packet;     ///< This is also copied from the dynamic protocol handler structure

    void *dynamic_protocol_context;        ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.

    int max_frames_per_packet;

};

extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;

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.

void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);

void av_register_rtp_dynamic_payload_handlers(void);

#endif /* FFMPEG_RTP_INTERNAL_H */