adding ffmpeg specific version

1 files changed, 847 insertions, 0 deletions

diff --git a/ffmpeg1/libavformat/udp.c b/ffmpeg1/libavformat/udp.c
new file mode 100644
index 0000000..e8a01db
--- /dev/null
+++ b/ffmpeg1/libavformat/udp.c
@@ -0,0 +1,847 @@
+/*
+ * UDP prototype streaming system
+ * Copyright (c) 2000, 2001, 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
+ * UDP protocol
+ */
+
+#define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc */
+
+#include "avformat.h"
+#include "avio_internal.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/fifo.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/log.h"
+#include "libavutil/time.h"
+#include "internal.h"
+#include "network.h"
+#include "os_support.h"
+#include "url.h"
+
+#if HAVE_PTHREAD_CANCEL
+#include <pthread.h>
+#endif
+
+#ifndef HAVE_PTHREAD_CANCEL
+#define HAVE_PTHREAD_CANCEL 0
+#endif
+
+#ifndef IPV6_ADD_MEMBERSHIP
+#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
+#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
+#endif
+
+#define UDP_TX_BUF_SIZE 32768
+#define UDP_MAX_PKT_SIZE 65536
+
+typedef struct {
+    const AVClass *class;
+    int udp_fd;
+    int ttl;
+    int buffer_size;
+    int is_multicast;
+    int local_port;
+    int reuse_socket;
+    int overrun_nonfatal;
+    struct sockaddr_storage dest_addr;
+    int dest_addr_len;
+    int is_connected;
+
+    /* Circular Buffer variables for use in UDP receive code */
+    int circular_buffer_size;
+    AVFifoBuffer *fifo;
+    int circular_buffer_error;
+#if HAVE_PTHREAD_CANCEL
+    pthread_t circular_buffer_thread;
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    int thread_started;
+#endif
+    uint8_t tmp[UDP_MAX_PKT_SIZE+4];
+    int remaining_in_dg;
+    char *local_addr;
+    int packet_size;
+    int timeout;
+} UDPContext;
+
+#define OFFSET(x) offsetof(UDPContext, x)
+#define D AV_OPT_FLAG_DECODING_PARAM
+#define E AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+{"buffer_size", "Socket buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
+{"localport", "Set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
+{"localaddr", "Choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
+{"pkt_size", "Set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
+{"reuse", "Explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
+{"ttl", "Set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
+{"connect", "Should connect() be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
+/* TODO 'sources', 'block' option */
+{"fifo_size", "Set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = 7*4096}, 0, INT_MAX, D },
+{"overrun_nonfatal", "Survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
+{"timeout", "In read mode: if no data arrived in more than this time interval, raise error", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
+{NULL}
+};
+
+static const AVClass udp_context_class = {
+    .class_name     = "udp",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
+};
+
+static void log_net_error(void *ctx, int level, const char* prefix)
+{
+    char errbuf[100];
+    av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
+    av_log(ctx, level, "%s: %s\n", prefix, errbuf);
+}
+
+static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
+                                 struct sockaddr *addr)
+{
+#ifdef IP_MULTICAST_TTL
+    if (addr->sa_family == AF_INET) {
+        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
+            return -1;
+        }
+    }
+#endif
+#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
+    if (addr->sa_family == AF_INET6) {
+        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
+            return -1;
+        }
+    }
+#endif
+    return 0;
+}
+
+static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
+{
+#ifdef IP_ADD_MEMBERSHIP
+    if (addr->sa_family == AF_INET) {
+        struct ip_mreq mreq;
+
+        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
+        mreq.imr_interface.s_addr= INADDR_ANY;
+        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
+            return -1;
+        }
+    }
+#endif
+#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
+    if (addr->sa_family == AF_INET6) {
+        struct ipv6_mreq mreq6;
+
+        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
+        mreq6.ipv6mr_interface= 0;
+        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
+            return -1;
+        }
+    }
+#endif
+    return 0;
+}
+
+static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
+{
+#ifdef IP_DROP_MEMBERSHIP
+    if (addr->sa_family == AF_INET) {
+        struct ip_mreq mreq;
+
+        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
+        mreq.imr_interface.s_addr= INADDR_ANY;
+        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
+            return -1;
+        }
+    }
+#endif
+#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
+    if (addr->sa_family == AF_INET6) {
+        struct ipv6_mreq mreq6;
+
+        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
+        mreq6.ipv6mr_interface= 0;
+        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
+            return -1;
+        }
+    }
+#endif
+    return 0;
+}
+
+static struct addrinfo* udp_resolve_host(const char *hostname, int port,
+                                         int type, int family, int flags)
+{
+    struct addrinfo hints = { 0 }, *res = 0;
+    int error;
+    char sport[16];
+    const char *node = 0, *service = "0";
+
+    if (port > 0) {
+        snprintf(sport, sizeof(sport), "%d", port);
+        service = sport;
+    }
+    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
+        node = hostname;
+    }
+    hints.ai_socktype = type;
+    hints.ai_family   = family;
+    hints.ai_flags = flags;
+    if ((error = getaddrinfo(node, service, &hints, &res))) {
+        res = NULL;
+        av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
+    }
+
+    return res;
+}
+
+static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
+                                     int addr_len, char **sources,
+                                     int nb_sources, int include)
+{
+#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
+    /* These ones are available in the microsoft SDK, but don't seem to work
+     * as on linux, so just prefer the v4-only approach there for now. */
+    int i;
+    for (i = 0; i < nb_sources; i++) {
+        struct group_source_req mreqs;
+        int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+        struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
+                                                       SOCK_DGRAM, AF_UNSPEC,
+                                                       AI_NUMERICHOST);
+        if (!sourceaddr)
+            return AVERROR(ENOENT);
+
+        mreqs.gsr_interface = 0;
+        memcpy(&mreqs.gsr_group, addr, addr_len);
+        memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
+        freeaddrinfo(sourceaddr);
+
+        if (setsockopt(sockfd, level,
+                       include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
+                       (const void *)&mreqs, sizeof(mreqs)) < 0) {
+            if (include)
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
+            else
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
+            return ff_neterrno();
+        }
+    }
+#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
+    int i;
+    if (addr->sa_family != AF_INET) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Setting multicast sources only supported for IPv4\n");
+        return AVERROR(EINVAL);
+    }
+    for (i = 0; i < nb_sources; i++) {
+        struct ip_mreq_source mreqs;
+        struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
+                                                       SOCK_DGRAM, AF_UNSPEC,
+                                                       AI_NUMERICHOST);
+        if (!sourceaddr)
+            return AVERROR(ENOENT);
+        if (sourceaddr->ai_addr->sa_family != AF_INET) {
+            freeaddrinfo(sourceaddr);
+            av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
+                   sources[i]);
+            return AVERROR(EINVAL);
+        }
+
+        mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
+        mreqs.imr_interface.s_addr = INADDR_ANY;
+        mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
+        freeaddrinfo(sourceaddr);
+
+        if (setsockopt(sockfd, IPPROTO_IP,
+                       include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
+                       (const void *)&mreqs, sizeof(mreqs)) < 0) {
+            if (include)
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
+            else
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
+            return ff_neterrno();
+        }
+    }
+#else
+    return AVERROR(ENOSYS);
+#endif
+    return 0;
+}
+static int udp_set_url(struct sockaddr_storage *addr,
+                       const char *hostname, int port)
+{
+    struct addrinfo *res0;
+    int addr_len;
+
+    res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
+    if (res0 == 0) return AVERROR(EIO);
+    memcpy(addr, res0->ai_addr, res0->ai_addrlen);
+    addr_len = res0->ai_addrlen;
+    freeaddrinfo(res0);
+
+    return addr_len;
+}
+
+static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
+                             socklen_t *addr_len, const char *localaddr)
+{
+    int udp_fd = -1;
+    struct addrinfo *res0 = NULL, *res = NULL;
+    int family = AF_UNSPEC;
+
+    if (((struct sockaddr *) &s->dest_addr)->sa_family)
+        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
+    res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
+                            SOCK_DGRAM, family, AI_PASSIVE);
+    if (res0 == 0)
+        goto fail;
+    for (res = res0; res; res=res->ai_next) {
+        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
+        if (udp_fd != -1) break;
+        log_net_error(NULL, AV_LOG_ERROR, "socket");
+    }
+
+    if (udp_fd < 0)
+        goto fail;
+
+    memcpy(addr, res->ai_addr, res->ai_addrlen);
+    *addr_len = res->ai_addrlen;
+
+    freeaddrinfo(res0);
+
+    return udp_fd;
+
+ fail:
+    if (udp_fd >= 0)
+        closesocket(udp_fd);
+    if(res0)
+        freeaddrinfo(res0);
+    return -1;
+}
+
+static int udp_port(struct sockaddr_storage *addr, int addr_len)
+{
+    char sbuf[sizeof(int)*3+1];
+    int error;
+
+    if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
+        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
+        return -1;
+    }
+
+    return strtol(sbuf, NULL, 10);
+}
+
+
+/**
+ * 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.
+ *
+ * url syntax: udp://host:port[?option=val...]
+ * option: 'ttl=n'       : set the ttl value (for multicast only)
+ *         'localport=n' : set the local port
+ *         'pkt_size=n'  : set max packet size
+ *         'reuse=1'     : enable reusing the socket
+ *         'overrun_nonfatal=1': survive in case of circular buffer overrun
+ *
+ * @param h media file context
+ * @param uri of the remote server
+ * @return zero if no error.
+ */
+int ff_udp_set_remote_url(URLContext *h, const char *uri)
+{
+    UDPContext *s = h->priv_data;
+    char hostname[256], buf[10];
+    int port;
+    const char *p;
+
+    av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+
+    /* set the destination address */
+    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
+    if (s->dest_addr_len < 0) {
+        return AVERROR(EIO);
+    }
+    s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
+    p = strchr(uri, '?');
+    if (p) {
+        if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
+            int was_connected = s->is_connected;
+            s->is_connected = strtol(buf, NULL, 10);
+            if (s->is_connected && !was_connected) {
+                if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
+                            s->dest_addr_len)) {
+                    s->is_connected = 0;
+                    log_net_error(h, AV_LOG_ERROR, "connect");
+                    return AVERROR(EIO);
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * Return the local port used by the UDP connection
+ * @param h media file context
+ * @return the local port number
+ */
+int ff_udp_get_local_port(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    return s->local_port;
+}
+
+/**
+ * Return the udp file handle for select() usage to wait for several RTP
+ * streams at the same time.
+ * @param h media file context
+ */
+static int udp_get_file_handle(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    return s->udp_fd;
+}
+
+#if HAVE_PTHREAD_CANCEL
+static void *circular_buffer_task( void *_URLContext)
+{
+    URLContext *h = _URLContext;
+    UDPContext *s = h->priv_data;
+    int old_cancelstate;
+
+    pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
+    pthread_mutex_lock(&s->mutex);
+    if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
+        av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
+        s->circular_buffer_error = AVERROR(EIO);
+        goto end;
+    }
+    while(1) {
+        int len;
+
+        pthread_mutex_unlock(&s->mutex);
+        /* Blocking operations are always cancellation points;
+           see "General Information" / "Thread Cancelation Overview"
+           in Single Unix. */
+        pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
+        len = recv(s->udp_fd, s->tmp+4, sizeof(s->tmp)-4, 0);
+        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
+        pthread_mutex_lock(&s->mutex);
+        if (len < 0) {
+            if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
+                s->circular_buffer_error = ff_neterrno();
+                goto end;
+            }
+            continue;
+        }
+        AV_WL32(s->tmp, len);
+
+        if(av_fifo_space(s->fifo) < len + 4) {
+            /* No Space left */
+            if (s->overrun_nonfatal) {
+                av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
+                        "Surviving due to overrun_nonfatal option\n");
+                continue;
+            } else {
+                av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
+                        "To avoid, increase fifo_size URL option. "
+                        "To survive in such case, use overrun_nonfatal option\n");
+                s->circular_buffer_error = AVERROR(EIO);
+                goto end;
+            }
+        }
+        av_fifo_generic_write(s->fifo, s->tmp, len+4, NULL);
+        pthread_cond_signal(&s->cond);
+    }
+
+end:
+    pthread_cond_signal(&s->cond);
+    pthread_mutex_unlock(&s->mutex);
+    return NULL;
+}
+#endif
+
+/* put it in UDP context */
+/* return non zero if error */
+static int udp_open(URLContext *h, const char *uri, int flags)
+{
+    char hostname[1024], localaddr[1024] = "";
+    int port, udp_fd = -1, tmp, bind_ret = -1;
+    UDPContext *s = h->priv_data;
+    int is_output;
+    const char *p;
+    char buf[256];
+    struct sockaddr_storage my_addr;
+    socklen_t len;
+    int reuse_specified = 0;
+    int i, include = 0, num_sources = 0;
+    char *sources[32];
+
+    h->is_streamed = 1;
+
+    is_output = !(flags & AVIO_FLAG_READ);
+    if (!s->buffer_size) /* if not set explicitly */
+        s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
+
+    p = strchr(uri, '?');
+    if (p) {
+        if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
+            char *endptr = NULL;
+            s->reuse_socket = strtol(buf, &endptr, 10);
+            /* assume if no digits were found it is a request to enable it */
+            if (buf == endptr)
+                s->reuse_socket = 1;
+            reuse_specified = 1;
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "overrun_nonfatal", p)) {
+            char *endptr = NULL;
+            s->overrun_nonfatal = strtol(buf, &endptr, 10);
+            /* assume if no digits were found it is a request to enable it */
+            if (buf == endptr)
+                s->overrun_nonfatal = 1;
+            if (!HAVE_PTHREAD_CANCEL)
+                av_log(h, AV_LOG_WARNING,
+                       "'overrun_nonfatal' option was set but it is not supported "
+                       "on this build (pthread support is required)\n");
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
+            s->ttl = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
+            s->local_port = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
+            s->packet_size = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
+            s->buffer_size = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
+            s->is_connected = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "fifo_size", p)) {
+            s->circular_buffer_size = strtol(buf, NULL, 10);
+            if (!HAVE_PTHREAD_CANCEL)
+                av_log(h, AV_LOG_WARNING,
+                       "'circular_buffer_size' option was set but it is not supported "
+                       "on this build (pthread support is required)\n");
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
+            av_strlcpy(localaddr, buf, sizeof(localaddr));
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "sources", p))
+            include = 1;
+        if (include || av_find_info_tag(buf, sizeof(buf), "block", p)) {
+            char *source_start;
+
+            source_start = buf;
+            while (1) {
+                char *next = strchr(source_start, ',');
+                if (next)
+                    *next = '\0';
+                sources[num_sources] = av_strdup(source_start);
+                if (!sources[num_sources])
+                    goto fail;
+                source_start = next + 1;
+                num_sources++;
+                if (num_sources >= FF_ARRAY_ELEMS(sources) || !next)
+                    break;
+            }
+        }
+        if (!is_output && av_find_info_tag(buf, sizeof(buf), "timeout", p))
+            s->timeout = strtol(buf, NULL, 10);
+    }
+    /* handling needed to support options picking from both AVOption and URL */
+    s->circular_buffer_size *= 188;
+    h->max_packet_size = s->packet_size;
+    h->rw_timeout = s->timeout;
+
+    /* fill the dest addr */
+    av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+
+    /* XXX: fix av_url_split */
+    if (hostname[0] == '\0' || hostname[0] == '?') {
+        /* only accepts null hostname if input */
+        if (!(flags & AVIO_FLAG_READ))
+            goto fail;
+    } else {
+        if (ff_udp_set_remote_url(h, uri) < 0)
+            goto fail;
+    }
+
+    if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
+        s->local_port = port;
+    udp_fd = udp_socket_create(s, &my_addr, &len, localaddr[0] ? localaddr : s->local_addr);
+    if (udp_fd < 0)
+        goto fail;
+
+    /* Follow the requested reuse option, unless it's multicast in which
+     * case enable reuse unless explicitly disabled.
+     */
+    if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
+        s->reuse_socket = 1;
+        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
+            goto fail;
+    }
+
+    /* If multicast, try binding the multicast address first, to avoid
+     * receiving UDP packets from other sources aimed at the same UDP
+     * port. This fails on windows. This makes sending to the same address
+     * using sendto() fail, so only do it if we're opened in read-only mode. */
+    if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
+        bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
+    }
+    /* bind to the local address if not multicast or if the multicast
+     * bind failed */
+    /* the bind is needed to give a port to the socket now */
+    if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
+        log_net_error(h, AV_LOG_ERROR, "bind failed");
+        goto fail;
+    }
+
+    len = sizeof(my_addr);
+    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
+    s->local_port = udp_port(&my_addr, len);
+
+    if (s->is_multicast) {
+        if (h->flags & AVIO_FLAG_WRITE) {
+            /* output */
+            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
+                goto fail;
+        }
+        if (h->flags & AVIO_FLAG_READ) {
+            /* input */
+            if (num_sources == 0 || !include) {
+                if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
+                    goto fail;
+
+                if (num_sources) {
+                    if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 0) < 0)
+                        goto fail;
+                }
+            } else if (include && num_sources) {
+                if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 1) < 0)
+                    goto fail;
+            } else {
+                av_log(NULL, AV_LOG_ERROR, "invalid udp settings: inclusive multicast but no sources given\n");
+                goto fail;
+            }
+        }
+    }
+
+    if (is_output) {
+        /* limit the tx buf size to limit latency */
+        tmp = s->buffer_size;
+        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
+            log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
+            goto fail;
+        }
+    } else {
+        /* set udp recv buffer size to the largest possible udp packet size to
+         * avoid losing data on OSes that set this too low by default. */
+        tmp = s->buffer_size;
+        if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
+            log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
+        }
+        /* make the socket non-blocking */
+        ff_socket_nonblock(udp_fd, 1);
+    }
+    if (s->is_connected) {
+        if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
+            log_net_error(h, AV_LOG_ERROR, "connect");
+            goto fail;
+        }
+    }
+
+    for (i = 0; i < num_sources; i++)
+        av_freep(&sources[i]);
+
+    s->udp_fd = udp_fd;
+
+#if HAVE_PTHREAD_CANCEL
+    if (!is_output && s->circular_buffer_size) {
+        int ret;
+
+        /* start the task going */
+        s->fifo = av_fifo_alloc(s->circular_buffer_size);
+        ret = pthread_mutex_init(&s->mutex, NULL);
+        if (ret != 0) {
+            av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
+            goto fail;
+        }
+        ret = pthread_cond_init(&s->cond, NULL);
+        if (ret != 0) {
+            av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
+            goto cond_fail;
+        }
+        ret = pthread_create(&s->circular_buffer_thread, NULL, circular_buffer_task, h);
+        if (ret != 0) {
+            av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
+            goto thread_fail;
+        }
+        s->thread_started = 1;
+    }
+#endif
+
+    return 0;
+#if HAVE_PTHREAD_CANCEL
+ thread_fail:
+    pthread_cond_destroy(&s->cond);
+ cond_fail:
+    pthread_mutex_destroy(&s->mutex);
+#endif
+ fail:
+    if (udp_fd >= 0)
+        closesocket(udp_fd);
+    av_fifo_free(s->fifo);
+    for (i = 0; i < num_sources; i++)
+        av_freep(&sources[i]);
+    return AVERROR(EIO);
+}
+
+static int udp_read(URLContext *h, uint8_t *buf, int size)
+{
+    UDPContext *s = h->priv_data;
+    int ret;
+    int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
+
+#if HAVE_PTHREAD_CANCEL
+    if (s->fifo) {
+        pthread_mutex_lock(&s->mutex);
+        do {
+            avail = av_fifo_size(s->fifo);
+            if (avail) { // >=size) {
+                uint8_t tmp[4];
+
+                av_fifo_generic_read(s->fifo, tmp, 4, NULL);
+                avail= AV_RL32(tmp);
+                if(avail > size){
+                    av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
+                    avail= size;
+                }
+
+                av_fifo_generic_read(s->fifo, buf, avail, NULL);
+                av_fifo_drain(s->fifo, AV_RL32(tmp) - avail);
+                pthread_mutex_unlock(&s->mutex);
+                return avail;
+            } else if(s->circular_buffer_error){
+                int err = s->circular_buffer_error;
+                pthread_mutex_unlock(&s->mutex);
+                return err;
+            } else if(nonblock) {
+                pthread_mutex_unlock(&s->mutex);
+                return AVERROR(EAGAIN);
+            }
+            else {
+                /* FIXME: using the monotonic clock would be better,
+                   but it does not exist on all supported platforms. */
+                int64_t t = av_gettime() + 100000;
+                struct timespec tv = { .tv_sec  =  t / 1000000,
+                                       .tv_nsec = (t % 1000000) * 1000 };
+                if (pthread_cond_timedwait(&s->cond, &s->mutex, &tv) < 0) {
+                    pthread_mutex_unlock(&s->mutex);
+                    return AVERROR(errno == ETIMEDOUT ? EAGAIN : errno);
+                }
+                nonblock = 1;
+            }
+        } while( 1);
+    }
+#endif
+
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->udp_fd, 0);
+        if (ret < 0)
+            return ret;
+    }
+    ret = recv(s->udp_fd, buf, size, 0);
+
+    return ret < 0 ? ff_neterrno() : ret;
+}
+
+static int udp_write(URLContext *h, const uint8_t *buf, int size)
+{
+    UDPContext *s = h->priv_data;
+    int ret;
+
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->udp_fd, 1);
+        if (ret < 0)
+            return ret;
+    }
+
+    if (!s->is_connected) {
+        ret = sendto (s->udp_fd, buf, size, 0,
+                      (struct sockaddr *) &s->dest_addr,
+                      s->dest_addr_len);
+    } else
+        ret = send(s->udp_fd, buf, size, 0);
+
+    return ret < 0 ? ff_neterrno() : ret;
+}
+
+static int udp_close(URLContext *h)
+{
+    UDPContext *s = h->priv_data;
+    int ret;
+
+    if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
+        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
+    closesocket(s->udp_fd);
+#if HAVE_PTHREAD_CANCEL
+    if (s->thread_started) {
+        pthread_cancel(s->circular_buffer_thread);
+        ret = pthread_join(s->circular_buffer_thread, NULL);
+        if (ret != 0)
+            av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
+        pthread_mutex_destroy(&s->mutex);
+        pthread_cond_destroy(&s->cond);
+    }
+#endif
+    av_fifo_free(s->fifo);
+    return 0;
+}
+
+URLProtocol ff_udp_protocol = {
+    .name                = "udp",
+    .url_open            = udp_open,
+    .url_read            = udp_read,
+    .url_write           = udp_write,
+    .url_close           = udp_close,
+    .url_get_file_handle = udp_get_file_handle,
+    .priv_data_size      = sizeof(UDPContext),
+    .priv_data_class     = &udp_context_class,
+    .flags               = URL_PROTOCOL_FLAG_NETWORK,
+};