#include <sys/types.h>#include <sys/time.h>#include <sys/uio.h>#include <netinet/in.h>#include <fcntl.h>#include <limits.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include "rtp_server.h"#include "rtpp_util.h"#include "rtp.h"struct rtp_server *rtp_server_new(const char *name, rtp_type_t codec, int loop){    struct rtp_server *rp;    int fd;    char path[PATH_MAX + 1];    sprintf(path, "%s.%d", name, codec);    fd = open(path, O_RDONLY);    if (fd == -1)	return NULL;    rp = malloc(sizeof(*rp));    if (rp == NULL)	return NULL;    memset(rp, 0, sizeof(*rp));    seedrandom();    rp->btime = -1;    rp->fd = fd;    rp->loop = (loop > 0) ? loop - 1 : loop;    rp->rtp = (rtp_hdr_t *)rp->buf;    rp->rtp->version = 2;    rp->rtp->p = 0;    rp->rtp->x = 0;    rp->rtp->cc = 0;    rp->rtp->m = 0;    rp->rtp->pt = codec;    rp->rtp->ts = 0;    rp->rtp->seq = 0;    rp->rtp->ssrc = random();    rp->pload = rp->buf + RTP_HDR_LEN(rp->rtp);    return rp;}voidrtp_server_free(struct rtp_server *rp){    close(rp->fd);    free(rp);}intrtp_server_get(struct rtp_server *rp){    uint32_t ts;    int rlen, rticks, bytes_per_frame, ticks_per_frame, number_of_frames;    if (rp->btime == -1)	rp->btime = getctime();    ts = ntohl(rp->rtp->ts);    if (rp->btime + ((double)ts / RTPS_SRATE) > getctime())	return RTPS_LATER;    switch (rp->rtp->pt) {    case RTP_PCMU:    case RTP_PCMA:	bytes_per_frame = 8;	ticks_per_frame = 1;	break;    case RTP_G729:	/* 10 ms per 8 kbps G.729 frame */	bytes_per_frame = 10;	ticks_per_frame = 10;	break;    case RTP_G723:	/* 30 ms per 6.3 kbps G.723 frame */	bytes_per_frame = 24;	ticks_per_frame = 30;	break;    default:	return RTPS_ERROR;    }    number_of_frames = RTPS_TICKS_MIN / ticks_per_frame;    if (RTPS_TICKS_MIN % ticks_per_frame != 0)	number_of_frames++;    rlen = bytes_per_frame * number_of_frames;    rticks = ticks_per_frame * number_of_frames;    if (read(rp->fd, rp->pload, rlen) != rlen) {	if (rp->loop == 0 || lseek(rp->fd, 0, SEEK_SET) == -1 ||	  read(rp->fd, rp->pload, rlen) != rlen)	    return RTPS_EOF;	if (rp->loop != -1)	    rp->loop -= 1;    }    rp->rtp->ts = htonl(ts + (RTPS_SRATE * rticks / 1000));    rp->rtp->seq = htons(ntohs(rp->rtp->seq) + 1);    return (rp->pload - rp->buf) + rlen;}