libavformat/rtpproto.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * RTP network protocol
  * Copyright (c) 2002 Fabrice Bellard
  *
  * 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
  */

 /**
  * @file libavformat/rtpproto.c
  * RTP protocol
  */

 #include "libavutil/avstring.h"
 #include "avformat.h"

 #include <unistd.h>
 #include <stdarg.h>
 #include "network.h"
 #include "os_support.h"
 #include <fcntl.h>
 #if HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif

 #define RTP_TX_BUF_SIZE  (64 * 1024)
 #define RTP_RX_BUF_SIZE  (128 * 1024)

 typedef struct RTPContext {
     URLContext *rtp_hd, *rtcp_hd;
     int rtp_fd, rtcp_fd;
 } RTPContext;

 /**
  * If no filename is given to av_open_input_file because you want to
  * get the local port first, then you must call this function to set
  * the remote server address.
  *
  * @param s1 media file context
  * @param uri of the remote server
  * @return zero if no error.
  */

 int rtp_set_remote_url(URLContext *h, const char *uri)
 {
     RTPContext *s = h->priv_data;
     char hostname[256];
     int port;

     char buf[1024];
     char path[1024];

     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
               path, sizeof(path), uri);

     snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
     udp_set_remote_url(s->rtp_hd, buf);

     snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
     udp_set_remote_url(s->rtcp_hd, buf);
     return 0;
 }


 /**
  * add option to url of the form:
  * "http://host:port/path?option1=val1&option2=val2...
  */

 static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
 {
     char buf1[1024];
     va_list ap;

     va_start(ap, fmt);
     if (strchr(buf, '?'))
         av_strlcat(buf, "&", buf_size);
     else
         av_strlcat(buf, "?", buf_size);
     vsnprintf(buf1, sizeof(buf1), fmt, ap);
     av_strlcat(buf, buf1, buf_size);
     va_end(ap);
 }

 static void build_udp_url(char *buf, int buf_size,
                           const char *hostname, int port,
                           int local_port, int ttl,
                           int max_packet_size)
 {
     snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
     if (local_port >= 0)
         url_add_option(buf, buf_size, "localport=%d", local_port);
     if (ttl >= 0)
         url_add_option(buf, buf_size, "ttl=%d", ttl);
     if (max_packet_size >=0)
         url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
 }

 /**
  * url syntax: rtp://host:port[?option=val...]
  * option: 'ttl=n'       : set the ttl value (for multicast only)
  *         'localport=n' : set the local port to n
  *         'pkt_size=n'  : set max packet size
  *
  */

 static int rtp_open(URLContext *h, const char *uri, int flags)
 {
     RTPContext *s;
     int port, is_output, ttl, local_port, max_packet_size;
     char hostname[256];
     char buf[1024];
     char path[1024];
     const char *p;

     is_output = (flags & URL_WRONLY);

     s = av_mallocz(sizeof(RTPContext));
     if (!s)
         return AVERROR(ENOMEM);
     h->priv_data = s;

     url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
               path, sizeof(path), uri);
     /* extract parameters */
     ttl = -1;
     local_port = -1;
     max_packet_size = -1;

     p = strchr(uri, '?');
     if (p) {
         if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
             ttl = strtol(buf, NULL, 10);
         }
         if (find_info_tag(buf, sizeof(buf), "localport", p)) {
             local_port = strtol(buf, NULL, 10);
         }
         if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
             max_packet_size = strtol(buf, NULL, 10);
         }
     }

     build_udp_url(buf, sizeof(buf),
                   hostname, port, local_port, ttl, max_packet_size);
     if (url_open(&s->rtp_hd, buf, flags) < 0)
         goto fail;
     local_port = udp_get_local_port(s->rtp_hd);
     /* XXX: need to open another connection if the port is not even */

     /* well, should suppress localport in path */

     build_udp_url(buf, sizeof(buf),
                   hostname, port + 1, local_port + 1, ttl, max_packet_size);
     if (url_open(&s->rtcp_hd, buf, flags) < 0)
         goto fail;

     /* just to ease handle access. XXX: need to suppress direct handle
        access */
     s->rtp_fd = url_get_file_handle(s->rtp_hd);
     s->rtcp_fd = url_get_file_handle(s->rtcp_hd);

     h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
     h->is_streamed = 1;
     return 0;

  fail:
     if (s->rtp_hd)
         url_close(s->rtp_hd);
     if (s->rtcp_hd)
         url_close(s->rtcp_hd);
     av_free(s);
     return AVERROR(EIO);
 }

 static int rtp_read(URLContext *h, uint8_t *buf, int size)
 {
     RTPContext *s = h->priv_data;
     struct sockaddr_in from;
     socklen_t from_len;
     int len, fd_max, n;
     fd_set rfds;
 #if 0
     for(;;) {
         from_len = sizeof(from);
         len = recvfrom (s->rtp_fd, buf, size, 0,
                         (struct sockaddr *)&from, &from_len);
         if (len < 0) {
             if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
                 ff_neterrno() == FF_NETERROR(EINTR))
                 continue;
             return AVERROR(EIO);
         }
         break;
     }
 #else
     for(;;) {
         /* build fdset to listen to RTP and RTCP packets */
         FD_ZERO(&rfds);
         fd_max = s->rtp_fd;
         FD_SET(s->rtp_fd, &rfds);
         if (s->rtcp_fd > fd_max)
             fd_max = s->rtcp_fd;
         FD_SET(s->rtcp_fd, &rfds);
         n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
         if (n > 0) {
             /* first try RTCP */
             if (FD_ISSET(s->rtcp_fd, &rfds)) {
                 from_len = sizeof(from);
                 len = recvfrom (s->rtcp_fd, buf, size, 0,
                                 (struct sockaddr *)&from, &from_len);
                 if (len < 0) {
                     if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
                         ff_neterrno() == FF_NETERROR(EINTR))
                         continue;
                     return AVERROR(EIO);
                 }
                 break;
             }
             /* then RTP */
             if (FD_ISSET(s->rtp_fd, &rfds)) {
                 from_len = sizeof(from);
                 len = recvfrom (s->rtp_fd, buf, size, 0,
                                 (struct sockaddr *)&from, &from_len);
                 if (len < 0) {
                     if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
                         ff_neterrno() == FF_NETERROR(EINTR))
                         continue;
                     return AVERROR(EIO);
                 }
                 break;
             }
         }
     }
 #endif
     return len;
 }

 static int rtp_write(URLContext *h, uint8_t *buf, int size)
 {
     RTPContext *s = h->priv_data;
     int ret;
     URLContext *hd;

     if (buf[1] >= 200 && buf[1] <= 204) {
         /* RTCP payload type */
         hd = s->rtcp_hd;
     } else {
         /* RTP payload type */
         hd = s->rtp_hd;
     }

     ret = url_write(hd, buf, size);
 #if 0
     {
         struct timespec ts;
         ts.tv_sec = 0;
         ts.tv_nsec = 10 * 1000000;
         nanosleep(&ts, NULL);
     }
 #endif
     return ret;
 }

 static int rtp_close(URLContext *h)
 {
     RTPContext *s = h->priv_data;

     url_close(s->rtp_hd);
     url_close(s->rtcp_hd);
     av_free(s);
     return 0;
 }

 /**
  * Return the local port used by the RTP connection
  * @param s1 media file context
  * @return the local port number
  */

 int rtp_get_local_port(URLContext *h)
 {
     RTPContext *s = h->priv_data;
     return udp_get_local_port(s->rtp_hd);
 }

 #if (LIBAVFORMAT_VERSION_MAJOR <= 52)
 /**
  * Return the rtp and rtcp file handles for select() usage to wait for
  * several RTP streams at the same time.
  * @param h media file context
  */

 void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
 {
     RTPContext *s = h->priv_data;

     *prtp_fd = s->rtp_fd;
     *prtcp_fd = s->rtcp_fd;
 }
 #endif

 static int rtp_get_file_handle(URLContext *h)
 {
     RTPContext *s = h->priv_data;
     return s->rtp_fd;
 }

 URLProtocol rtp_protocol = {
     "rtp",
     rtp_open,
     rtp_read,
     rtp_write,
     NULL, /* seek */
     rtp_close,
     .url_get_file_handle = rtp_get_file_handle,
 };
	/*
	* RTP network protocol
	* Copyright (c) 2002 Fabrice Bellard
	*
	* 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
	*/

	/**
	* @file libavformat/rtpproto.c
	* RTP protocol
	*/

	#include "libavutil/avstring.h"
	#include "avformat.h"

	#include <unistd.h>
	#include <stdarg.h>
	#include "network.h"
	#include "os_support.h"
	#include <fcntl.h>
	#if HAVE_SYS_SELECT_H
	#include <sys/select.h>
	#endif

	#define RTP_TX_BUF_SIZE (64 * 1024)
	#define RTP_RX_BUF_SIZE (128 * 1024)

	typedef struct RTPContext {
	URLContext rtp_hd, rtcp_hd;
	int rtp_fd, rtcp_fd;
	} RTPContext;

	/**
	* If no filename is given to av_open_input_file because you want to
	* get the local port first, then you must call this function to set
	* the remote server address.
	*
	* @param s1 media file context
	* @param uri of the remote server
	* @return zero if no error.
	*/

	int rtp_set_remote_url(URLContext h, const char uri)
	{
	RTPContext *s = h->priv_data;
	char hostname[256];
	int port;

	char buf[1024];
	char path[1024];

	url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
	path, sizeof(path), uri);

	snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
	udp_set_remote_url(s->rtp_hd, buf);

	snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
	udp_set_remote_url(s->rtcp_hd, buf);
	return 0;
	}


	/**
	* add option to url of the form:
	* "http://host:port/path?option1=val1&option2=val2...
	*/

	static void url_add_option(char buf, int buf_size, const char fmt, ...)
	{
	char buf1[1024];
	va_list ap;

	va_start(ap, fmt);
	if (strchr(buf, '?'))
	av_strlcat(buf, "&", buf_size);
	else
	av_strlcat(buf, "?", buf_size);
	vsnprintf(buf1, sizeof(buf1), fmt, ap);
	av_strlcat(buf, buf1, buf_size);
	va_end(ap);
	}

	static void build_udp_url(char *buf, int buf_size,
	const char *hostname, int port,
	int local_port, int ttl,
	int max_packet_size)
	{
	snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
	if (local_port >= 0)
	url_add_option(buf, buf_size, "localport=%d", local_port);
	if (ttl >= 0)
	url_add_option(buf, buf_size, "ttl=%d", ttl);
	if (max_packet_size >=0)
	url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
	}

	/**
	* url syntax: rtp://host:port[?option=val...]
	* option: 'ttl=n' : set the ttl value (for multicast only)
	* 'localport=n' : set the local port to n
	* 'pkt_size=n' : set max packet size
	*
	*/

	static int rtp_open(URLContext h, const char uri, int flags)
	{
	RTPContext *s;
	int port, is_output, ttl, local_port, max_packet_size;
	char hostname[256];
	char buf[1024];
	char path[1024];
	const char *p;

	is_output = (flags & URL_WRONLY);

	s = av_mallocz(sizeof(RTPContext));
	if (!s)
	return AVERROR(ENOMEM);
	h->priv_data = s;

	url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
	path, sizeof(path), uri);
	/* extract parameters */
	ttl = -1;
	local_port = -1;
	max_packet_size = -1;

	p = strchr(uri, '?');
	if (p) {
	if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
	ttl = strtol(buf, NULL, 10);
	}
	if (find_info_tag(buf, sizeof(buf), "localport", p)) {
	local_port = strtol(buf, NULL, 10);
	}
	if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
	max_packet_size = strtol(buf, NULL, 10);
	}
	}

	build_udp_url(buf, sizeof(buf),
	hostname, port, local_port, ttl, max_packet_size);
	if (url_open(&s->rtp_hd, buf, flags) < 0)
	goto fail;
	local_port = udp_get_local_port(s->rtp_hd);
	/* XXX: need to open another connection if the port is not even */

	/* well, should suppress localport in path */

	build_udp_url(buf, sizeof(buf),
	hostname, port + 1, local_port + 1, ttl, max_packet_size);
	if (url_open(&s->rtcp_hd, buf, flags) < 0)
	goto fail;

	/* just to ease handle access. XXX: need to suppress direct handle
	access */
	s->rtp_fd = url_get_file_handle(s->rtp_hd);
	s->rtcp_fd = url_get_file_handle(s->rtcp_hd);

	h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
	h->is_streamed = 1;
	return 0;

	fail:
	if (s->rtp_hd)
	url_close(s->rtp_hd);
	if (s->rtcp_hd)
	url_close(s->rtcp_hd);
	av_free(s);
	return AVERROR(EIO);
	}

	static int rtp_read(URLContext h, uint8_t buf, int size)
	{
	RTPContext *s = h->priv_data;
	struct sockaddr_in from;
	socklen_t from_len;
	int len, fd_max, n;
	fd_set rfds;
	#if 0
	for(;;) {
	from_len = sizeof(from);
	len = recvfrom (s->rtp_fd, buf, size, 0,
	(struct sockaddr *)&from, &from_len);
	if (len < 0) {
	if (ff_neterrno() == FF_NETERROR(EAGAIN) \|\|
	ff_neterrno() == FF_NETERROR(EINTR))
	continue;
	return AVERROR(EIO);
	}
	break;
	}
	#else
	for(;;) {
	/* build fdset to listen to RTP and RTCP packets */
	FD_ZERO(&rfds);
	fd_max = s->rtp_fd;
	FD_SET(s->rtp_fd, &rfds);
	if (s->rtcp_fd > fd_max)
	fd_max = s->rtcp_fd;
	FD_SET(s->rtcp_fd, &rfds);
	n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
	if (n > 0) {
	/* first try RTCP */
	if (FD_ISSET(s->rtcp_fd, &rfds)) {
	from_len = sizeof(from);
	len = recvfrom (s->rtcp_fd, buf, size, 0,
	(struct sockaddr *)&from, &from_len);
	if (len < 0) {
	if (ff_neterrno() == FF_NETERROR(EAGAIN) \|\|
	ff_neterrno() == FF_NETERROR(EINTR))
	continue;
	return AVERROR(EIO);
	}
	break;
	}
	/* then RTP */
	if (FD_ISSET(s->rtp_fd, &rfds)) {
	from_len = sizeof(from);
	len = recvfrom (s->rtp_fd, buf, size, 0,
	(struct sockaddr *)&from, &from_len);
	if (len < 0) {
	if (ff_neterrno() == FF_NETERROR(EAGAIN) \|\|
	ff_neterrno() == FF_NETERROR(EINTR))
	continue;
	return AVERROR(EIO);
	}
	break;
	}
	}
	}
	#endif
	return len;
	}

	static int rtp_write(URLContext h, uint8_t buf, int size)
	{
	RTPContext *s = h->priv_data;
	int ret;
	URLContext *hd;

	if (buf[1] >= 200 && buf[1] <= 204) {
	/* RTCP payload type */
	hd = s->rtcp_hd;
	} else {
	/* RTP payload type */
	hd = s->rtp_hd;
	}

	ret = url_write(hd, buf, size);
	#if 0
	{
	struct timespec ts;
	ts.tv_sec = 0;
	ts.tv_nsec = 10 * 1000000;
	nanosleep(&ts, NULL);
	}
	#endif
	return ret;
	}

	static int rtp_close(URLContext *h)
	{
	RTPContext *s = h->priv_data;

	url_close(s->rtp_hd);
	url_close(s->rtcp_hd);
	av_free(s);
	return 0;
	}

	/**
	* Return the local port used by the RTP connection
	* @param s1 media file context
	* @return the local port number
	*/

	int rtp_get_local_port(URLContext *h)
	{
	RTPContext *s = h->priv_data;
	return udp_get_local_port(s->rtp_hd);
	}

	#if (LIBAVFORMAT_VERSION_MAJOR <= 52)
	/**
	* Return the rtp and rtcp file handles for select() usage to wait for
	* several RTP streams at the same time.
	* @param h media file context
	*/

	void rtp_get_file_handles(URLContext h, int prtp_fd, int *prtcp_fd)
	{
	RTPContext *s = h->priv_data;

	*prtp_fd = s->rtp_fd;
	*prtcp_fd = s->rtcp_fd;
	}
	#endif

	static int rtp_get_file_handle(URLContext *h)
	{
	RTPContext *s = h->priv_data;
	return s->rtp_fd;
	}

	URLProtocol rtp_protocol = {
	"rtp",
	rtp_open,
	rtp_read,
	rtp_write,
	NULL, /* seek */
	rtp_close,
	.url_get_file_handle = rtp_get_file_handle,
	};