| /* |
| * 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 = udp_get_file_handle(s->rtp_hd); |
| s->rtcp_fd = udp_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); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| URLProtocol rtp_protocol = { |
| "rtp", |
| rtp_open, |
| rtp_read, |
| rtp_write, |
| NULL, /* seek */ |
| rtp_close, |
| }; |