mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 08:12:17 +00:00
c657594049
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26788 b3059339-0415-0410-9bf9-f77b7e298cf2
256 lines
7.2 KiB
C
256 lines
7.2 KiB
C
/* Imported from the dvbstream-0.2 project
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*
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* Modified for use with MPlayer, for details see the changelog at
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* http://svn.mplayerhq.hu/mplayer/trunk/
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* $Id$
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include "config.h"
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#ifndef HAVE_WINSOCK2
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#define closesocket close
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#else
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#endif
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#include <errno.h>
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#include "stream.h"
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/* MPEG-2 TS RTP stack */
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#define DEBUG 1
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#include "mp_msg.h"
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#include "rtp.h"
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// RTP reorder routines
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// Also handling of repeated UDP packets (a bug of ExtremeNetworks switches firmware)
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// rtpreord procedures
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// write rtp packets in cache
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// get rtp packets reordered
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#define MAXRTPPACKETSIN 32 // The number of max packets being reordered
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struct rtpbits {
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unsigned int v:2; /* version: 2 */
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unsigned int p:1; /* is there padding appended: 0 */
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unsigned int x:1; /* number of extension headers: 0 */
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unsigned int cc:4; /* number of CSRC identifiers: 0 */
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unsigned int m:1; /* marker: 0 */
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unsigned int pt:7; /* payload type: 33 for MPEG2 TS - RFC 1890 */
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unsigned int sequence:16; /* sequence number: random */
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};
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struct rtpheader { /* in network byte order */
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struct rtpbits b;
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int timestamp; /* start: random */
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int ssrc; /* random */
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};
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struct rtpbuffer
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{
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unsigned char data[MAXRTPPACKETSIN][STREAM_BUFFER_SIZE];
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unsigned short seq[MAXRTPPACKETSIN];
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unsigned short len[MAXRTPPACKETSIN];
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unsigned short first;
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};
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static struct rtpbuffer rtpbuf;
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static int getrtp2(int fd, struct rtpheader *rh, char** data, int* lengthData);
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// RTP Reordering functions
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// Algorithm works as follows:
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// If next packet is in sequence just copy it to buffer
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// Otherwise copy it in cache according to its sequence number
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// Cache is a circular array where "rtpbuf.first" points to next sequence slot
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// and keeps track of expected sequence
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// Initialize rtp cache
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static void rtp_cache_reset(unsigned short seq)
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{
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int i;
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rtpbuf.first = 0;
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rtpbuf.seq[0] = ++seq;
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for (i=0; i<MAXRTPPACKETSIN; i++) {
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rtpbuf.len[i] = 0;
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}
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}
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// Write in a cache the rtp packet in right rtp sequence order
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static int rtp_cache(int fd, char *buffer, int length)
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{
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struct rtpheader rh;
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int newseq;
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char *data;
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unsigned short seq;
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static int is_first = 1;
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getrtp2(fd, &rh, &data, &length);
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if(!length)
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return 0;
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seq = rh.b.sequence;
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newseq = seq - rtpbuf.seq[rtpbuf.first];
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if ((newseq == 0) || is_first)
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{
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is_first = 0;
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//mp_msg(MSGT_NETWORK, MSGL_DBG4, "RTP (seq[%d]=%d seq=%d, newseq=%d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq);
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rtpbuf.first = ( 1 + rtpbuf.first ) % MAXRTPPACKETSIN;
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rtpbuf.seq[rtpbuf.first] = ++seq;
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goto feed;
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}
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if (newseq > MAXRTPPACKETSIN)
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{
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mp_msg(MSGT_NETWORK, MSGL_DBG2, "Overrun(seq[%d]=%d seq=%d, newseq=%d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq);
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rtp_cache_reset(seq);
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goto feed;
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}
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if (newseq < 0)
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{
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int i;
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// Is it a stray packet re-sent to network?
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for (i=0; i<MAXRTPPACKETSIN; i++) {
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if (rtpbuf.seq[i] == seq) {
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mp_msg(MSGT_NETWORK, MSGL_ERR, "Stray packet (seq[%d]=%d seq=%d, newseq=%d found at %d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq, i);
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return 0; // Yes, it is!
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}
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}
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// Some heuristic to decide when to drop packet or to restart everything
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if (newseq > -(3 * MAXRTPPACKETSIN)) {
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mp_msg(MSGT_NETWORK, MSGL_ERR, "Too Old packet (seq[%d]=%d seq=%d, newseq=%d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq);
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return 0; // Yes, it is!
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}
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mp_msg(MSGT_NETWORK, MSGL_ERR, "Underrun(seq[%d]=%d seq=%d, newseq=%d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq);
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rtp_cache_reset(seq);
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goto feed;
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}
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mp_msg(MSGT_NETWORK, MSGL_DBG4, "Out of Seq (seq[%d]=%d seq=%d, newseq=%d)\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first], seq, newseq);
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newseq = ( newseq + rtpbuf.first ) % MAXRTPPACKETSIN;
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memcpy (rtpbuf.data[newseq], data, length);
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rtpbuf.len[newseq] = length;
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rtpbuf.seq[newseq] = seq;
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return 0;
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feed:
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memcpy (buffer, data, length);
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return length;
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}
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// Get next packet in cache
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// Look in cache to get first packet in sequence
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static int rtp_get_next(int fd, char *buffer, int length)
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{
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int i;
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unsigned short nextseq;
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// If we have empty buffer we loop to fill it
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for (i=0; i < MAXRTPPACKETSIN -3; i++) {
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if (rtpbuf.len[rtpbuf.first] != 0) break;
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length = rtp_cache(fd, buffer, length) ;
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// returns on first packet in sequence
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if (length > 0) {
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//mp_msg(MSGT_NETWORK, MSGL_DBG4, "Getting rtp [%d] %hu\n", i, rtpbuf.first);
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return length;
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} else if (length < 0) break;
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// Only if length == 0 loop continues!
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}
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i = rtpbuf.first;
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while (rtpbuf.len[i] == 0) {
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mp_msg(MSGT_NETWORK, MSGL_ERR, "Lost packet %hu\n", rtpbuf.seq[i]);
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i = ( 1 + i ) % MAXRTPPACKETSIN;
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if (rtpbuf.first == i) break;
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}
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rtpbuf.first = i;
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// Copy next non empty packet from cache
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mp_msg(MSGT_NETWORK, MSGL_DBG4, "Getting rtp from cache [%d] %hu\n", rtpbuf.first, rtpbuf.seq[rtpbuf.first]);
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memcpy (buffer, rtpbuf.data[rtpbuf.first], rtpbuf.len[rtpbuf.first]);
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length = rtpbuf.len[rtpbuf.first]; // can be zero?
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// Reset fisrt slot and go next in cache
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rtpbuf.len[rtpbuf.first] = 0;
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nextseq = rtpbuf.seq[rtpbuf.first];
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rtpbuf.first = ( 1 + rtpbuf.first ) % MAXRTPPACKETSIN;
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rtpbuf.seq[rtpbuf.first] = nextseq + 1;
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return length;
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}
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// Read next rtp packet using cache
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int read_rtp_from_server(int fd, char *buffer, int length) {
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// Following test is ASSERT (i.e. uneuseful if code is correct)
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if(buffer==NULL || length<STREAM_BUFFER_SIZE) {
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mp_msg(MSGT_NETWORK, MSGL_ERR, "RTP buffer invalid; no data return from network\n");
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return 0;
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}
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// loop just to skip empty packets
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while ((length = rtp_get_next(fd, buffer, length)) == 0) {
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mp_msg(MSGT_NETWORK, MSGL_ERR, "Got empty packet from RTP cache!?\n");
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}
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return length;
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}
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static int getrtp2(int fd, struct rtpheader *rh, char** data, int* lengthData) {
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static char buf[1600];
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unsigned int intP;
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char* charP = (char*) &intP;
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int headerSize;
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int lengthPacket;
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lengthPacket=recv(fd,buf,1590,0);
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if (lengthPacket<0)
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mp_msg(MSGT_NETWORK,MSGL_ERR,"rtp: socket read error\n");
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else if (lengthPacket<12)
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mp_msg(MSGT_NETWORK,MSGL_ERR,"rtp: packet too small (%d) to be an rtp frame (>12bytes)\n", lengthPacket);
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if(lengthPacket<12) {
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*lengthData = 0;
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return 0;
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}
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rh->b.v = (unsigned int) ((buf[0]>>6)&0x03);
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rh->b.p = (unsigned int) ((buf[0]>>5)&0x01);
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rh->b.x = (unsigned int) ((buf[0]>>4)&0x01);
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rh->b.cc = (unsigned int) ((buf[0]>>0)&0x0f);
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rh->b.m = (unsigned int) ((buf[1]>>7)&0x01);
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rh->b.pt = (unsigned int) ((buf[1]>>0)&0x7f);
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intP = 0;
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memcpy(charP+2,&buf[2],2);
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rh->b.sequence = ntohl(intP);
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intP = 0;
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memcpy(charP,&buf[4],4);
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rh->timestamp = ntohl(intP);
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headerSize = 12 + 4*rh->b.cc; /* in bytes */
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*lengthData = lengthPacket - headerSize;
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*data = (char*) buf + headerSize;
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// mp_msg(MSGT_NETWORK,MSGL_DBG2,"Reading rtp: v=%x p=%x x=%x cc=%x m=%x pt=%x seq=%x ts=%x lgth=%d\n",rh->b.v,rh->b.p,rh->b.x,rh->b.cc,rh->b.m,rh->b.pt,rh->b.sequence,rh->timestamp,lengthPacket);
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return 0;
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}
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