diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/rtpproto.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/rtpproto.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/rtpproto.c b/contrib/ffmpeg/libavformat/rtpproto.c new file mode 100644 index 000000000..4d32e667d --- /dev/null +++ b/contrib/ffmpeg/libavformat/rtpproto.c @@ -0,0 +1,295 @@ +/* + * 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 + */ +#include "avformat.h" + +#include <unistd.h> +#include <stdarg.h> +#include "network.h" +#include <fcntl.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 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, '?')) + pstrcat(buf, buf_size, "&"); + else + pstrcat(buf, buf_size, "?"); + vsnprintf(buf1, sizeof(buf1), fmt, ap); + pstrcat(buf, buf_size, buf1); + va_end(ap); +} + +static void build_udp_url(char *buf, int buf_size, + const char *hostname, int port, + int local_port, int multicast, int ttl) +{ + snprintf(buf, buf_size, "udp://%s:%d", hostname, port); + if (local_port >= 0) + url_add_option(buf, buf_size, "localport=%d", local_port); + if (multicast) + url_add_option(buf, buf_size, "multicast=1"); + if (ttl >= 0) + url_add_option(buf, buf_size, "ttl=%d", ttl); +} + +/* + * url syntax: rtp://host:port[?option=val...] + * option: 'multicast=1' : enable multicast + * 'ttl=n' : set the ttl value (for multicast only) + * 'localport=n' : set the local port to n + * + */ +static int rtp_open(URLContext *h, const char *uri, int flags) +{ + RTPContext *s; + int port, is_output, is_multicast, ttl, local_port; + 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 */ + is_multicast = 0; + ttl = -1; + local_port = -1; + p = strchr(uri, '?'); + if (p) { + is_multicast = find_info_tag(buf, sizeof(buf), "multicast", 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); + } + } + + build_udp_url(buf, sizeof(buf), + hostname, port, local_port, is_multicast, ttl); + 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 connexion if the port is not even */ + + /* well, should suppress localport in path */ + + build_udp_url(buf, sizeof(buf), + hostname, port + 1, local_port + 1, is_multicast, ttl); + 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_IO; +} + +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 (errno == EAGAIN || errno == EINTR) + continue; + return AVERROR_IO; + } + 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 (errno == EAGAIN || errno == EINTR) + continue; + return AVERROR_IO; + } + 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 (errno == EAGAIN || errno == EINTR) + continue; + return AVERROR_IO; + } + 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 connexion + * @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, +}; |