| /* |
| * 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 |
| * RTP protocol |
| */ |
| |
| #include "libavutil/parseutils.h" |
| #include "libavutil/avstring.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "rtpdec.h" |
| #include "url.h" |
| |
| #include <unistd.h> |
| #include <stdarg.h> |
| #include "internal.h" |
| #include "network.h" |
| #include "os_support.h" |
| #include <fcntl.h> |
| #if HAVE_POLL_H |
| #include <sys/poll.h> |
| #endif |
| #include <sys/time.h> |
| |
| #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 h media file context |
| * @param uri of the remote server |
| * @return zero if no error. |
| */ |
| |
| int ff_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]; |
| |
| av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, |
| path, sizeof(path), uri); |
| |
| ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path); |
| ff_udp_set_remote_url(s->rtp_hd, buf); |
| |
| ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path); |
| ff_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 av_printf_format(3, 4) 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, int connect) |
| { |
| ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL); |
| 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); |
| if (connect) |
| url_add_option(buf, buf_size, "connect=1"); |
| url_add_option(buf, buf_size, "fifo_size=0"); |
| } |
| |
| /** |
| * url syntax: rtp://host:port[?option=val...] |
| * option: 'ttl=n' : set the ttl value (for multicast only) |
| * 'rtcpport=n' : set the remote rtcp port to n |
| * 'localrtpport=n' : set the local rtp port to n |
| * 'localrtcpport=n' : set the local rtcp port to n |
| * 'pkt_size=n' : set max packet size |
| * 'connect=0/1' : do a connect() on the UDP socket |
| * deprecated option: |
| * 'localport=n' : set the local port to n |
| * |
| * if rtcpport isn't set the rtcp port will be the rtp port + 1 |
| * if local rtp port isn't set any available port will be used for the local |
| * rtp and rtcp ports |
| * if the local rtcp port is not set it will be the local rtp port + 1 |
| */ |
| |
| static int rtp_open(URLContext *h, const char *uri, int flags) |
| { |
| RTPContext *s = h->priv_data; |
| int rtp_port, rtcp_port, |
| ttl, connect, |
| local_rtp_port, local_rtcp_port, max_packet_size; |
| char hostname[256]; |
| char buf[1024]; |
| char path[1024]; |
| const char *p; |
| |
| av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port, |
| path, sizeof(path), uri); |
| /* extract parameters */ |
| ttl = -1; |
| rtcp_port = rtp_port+1; |
| local_rtp_port = -1; |
| local_rtcp_port = -1; |
| max_packet_size = -1; |
| connect = 0; |
| |
| p = strchr(uri, '?'); |
| if (p) { |
| if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) { |
| ttl = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "rtcpport", p)) { |
| rtcp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localport", p)) { |
| local_rtp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localrtpport", p)) { |
| local_rtp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "localrtcpport", p)) { |
| local_rtcp_port = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) { |
| max_packet_size = strtol(buf, NULL, 10); |
| } |
| if (av_find_info_tag(buf, sizeof(buf), "connect", p)) { |
| connect = strtol(buf, NULL, 10); |
| } |
| } |
| |
| build_udp_url(buf, sizeof(buf), |
| hostname, rtp_port, local_rtp_port, ttl, max_packet_size, |
| connect); |
| if (ffurl_open(&s->rtp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) |
| goto fail; |
| if (local_rtp_port>=0 && local_rtcp_port<0) |
| local_rtcp_port = ff_udp_get_local_port(s->rtp_hd) + 1; |
| |
| build_udp_url(buf, sizeof(buf), |
| hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size, |
| connect); |
| if (ffurl_open(&s->rtcp_hd, buf, flags, &h->interrupt_callback, NULL) < 0) |
| goto fail; |
| |
| /* just to ease handle access. XXX: need to suppress direct handle |
| access */ |
| s->rtp_fd = ffurl_get_file_handle(s->rtp_hd); |
| s->rtcp_fd = ffurl_get_file_handle(s->rtcp_hd); |
| |
| h->max_packet_size = s->rtp_hd->max_packet_size; |
| h->is_streamed = 1; |
| return 0; |
| |
| fail: |
| if (s->rtp_hd) |
| ffurl_close(s->rtp_hd); |
| if (s->rtcp_hd) |
| ffurl_close(s->rtcp_hd); |
| return AVERROR(EIO); |
| } |
| |
| static int rtp_read(URLContext *h, uint8_t *buf, int size) |
| { |
| RTPContext *s = h->priv_data; |
| struct sockaddr_storage from; |
| socklen_t from_len; |
| int len, n; |
| struct pollfd p[2] = {{s->rtp_fd, POLLIN, 0}, {s->rtcp_fd, POLLIN, 0}}; |
| |
| for(;;) { |
| if (ff_check_interrupt(&h->interrupt_callback)) |
| return AVERROR_EXIT; |
| /* build fdset to listen to RTP and RTCP packets */ |
| n = poll(p, 2, 100); |
| if (n > 0) { |
| /* first try RTCP */ |
| if (p[1].revents & POLLIN) { |
| from_len = sizeof(from); |
| len = recvfrom (s->rtcp_fd, buf, size, 0, |
| (struct sockaddr *)&from, &from_len); |
| if (len < 0) { |
| if (ff_neterrno() == AVERROR(EAGAIN) || |
| ff_neterrno() == AVERROR(EINTR)) |
| continue; |
| return AVERROR(EIO); |
| } |
| break; |
| } |
| /* then RTP */ |
| if (p[0].revents & POLLIN) { |
| from_len = sizeof(from); |
| len = recvfrom (s->rtp_fd, buf, size, 0, |
| (struct sockaddr *)&from, &from_len); |
| if (len < 0) { |
| if (ff_neterrno() == AVERROR(EAGAIN) || |
| ff_neterrno() == AVERROR(EINTR)) |
| continue; |
| return AVERROR(EIO); |
| } |
| break; |
| } |
| } else if (n < 0) { |
| if (ff_neterrno() == AVERROR(EINTR)) |
| continue; |
| return AVERROR(EIO); |
| } |
| } |
| return len; |
| } |
| |
| static int rtp_write(URLContext *h, const uint8_t *buf, int size) |
| { |
| RTPContext *s = h->priv_data; |
| int ret; |
| URLContext *hd; |
| |
| if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) { |
| /* RTCP payload type */ |
| hd = s->rtcp_hd; |
| } else { |
| /* RTP payload type */ |
| hd = s->rtp_hd; |
| } |
| |
| ret = ffurl_write(hd, buf, size); |
| return ret; |
| } |
| |
| static int rtp_close(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| |
| ffurl_close(s->rtp_hd); |
| ffurl_close(s->rtcp_hd); |
| return 0; |
| } |
| |
| /** |
| * Return the local rtp port used by the RTP connection |
| * @param h media file context |
| * @return the local port number |
| */ |
| |
| int ff_rtp_get_local_rtp_port(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return ff_udp_get_local_port(s->rtp_hd); |
| } |
| |
| /** |
| * Return the local rtcp port used by the RTP connection |
| * @param h media file context |
| * @return the local port number |
| */ |
| |
| int ff_rtp_get_local_rtcp_port(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return ff_udp_get_local_port(s->rtcp_hd); |
| } |
| |
| static int rtp_get_file_handle(URLContext *h) |
| { |
| RTPContext *s = h->priv_data; |
| return s->rtp_fd; |
| } |
| |
| int ff_rtp_get_rtcp_file_handle(URLContext *h) { |
| RTPContext *s = h->priv_data; |
| return s->rtcp_fd; |
| } |
| |
| URLProtocol ff_rtp_protocol = { |
| .name = "rtp", |
| .url_open = rtp_open, |
| .url_read = rtp_read, |
| .url_write = rtp_write, |
| .url_close = rtp_close, |
| .url_get_file_handle = rtp_get_file_handle, |
| .priv_data_size = sizeof(RTPContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| }; |
