lavf: Support unix sockets

configure

@@ -1354,6 +1354,7 @@ HAVE_LIST="
     sys_select_h
     sys_soundcard_h
     sys_time_h
+    sys_un_h
     sys_videoio_h
     threads
     unistd_h
@@ -1874,6 +1875,8 @@ tcp_protocol_select="network"
 tls_protocol_deps_any="openssl gnutls"
 tls_protocol_select="tcp_protocol"
 udp_protocol_select="network"
+unix_protocol_deps="sys_un_h"
+unix_protocol_select="network"
 
 # filters
 blackframe_filter_deps="gpl"
@@ -3657,6 +3660,7 @@ check_header sys/param.h
 check_header sys/resource.h
 check_header sys/select.h
 check_header sys/time.h
+check_header sys/un.h
 check_header unistd.h
 check_header vdpau/vdpau.h
 check_header vdpau/vdpau_x11.h

doc/protocols.texi

@@ -626,4 +626,24 @@ To receive over UDP from a remote endpoint:
 avconv -i udp://[@var{multicast-address}]:@var{port}
 @end example
 
+@section unix
+
+Unix local socket
+
+The required syntax for a Unix socket URL is:
+
+@example
+unix://@var{filepath}
+@end example
+
+The following parameters can be set via command line options
+(or in code via @code{AVOption}s):
+
+@table @option
+@item timeout
+Timeout in ms.
+@item listen
+Create the Unix socket in listening mode.
+@end table
+
 @c man end PROTOCOLS

libavformat/Makefile

@@ -376,6 +376,7 @@ OBJS-$(CONFIG_SRTP_PROTOCOL)             += srtpproto.o srtp.o
 OBJS-$(CONFIG_TCP_PROTOCOL)              += tcp.o
 OBJS-$(CONFIG_TLS_PROTOCOL)              += tls.o
 OBJS-$(CONFIG_UDP_PROTOCOL)              += udp.o
+OBJS-$(CONFIG_UNIX_PROTOCOL)             += unix.o
 
 SKIPHEADERS-$(CONFIG_FFRTMPCRYPT_PROTOCOL) += rtmpdh.h
 SKIPHEADERS-$(CONFIG_NETWORK)            += network.h rtsp.h

libavformat/allformats.c

@@ -281,6 +281,7 @@ void av_register_all(void)
     REGISTER_PROTOCOL(TCP,              tcp);
     REGISTER_PROTOCOL(TLS,              tls);
     REGISTER_PROTOCOL(UDP,              udp);
+    REGISTER_PROTOCOL(UNIX,             unix);
 
     /* external libraries */
     REGISTER_PROTOCOL(LIBRTMP,          librtmp);

libavformat/unix.c

@@ -0,0 +1,156 @@
+/*
+ * Unix socket protocol
+ * Copyright (c) 2013 Luca Barbato
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ *
+ * Unix socket url_protocol
+ *
+ */
+
+#include <sys/un.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "os_support.h"
+#include "network.h"
+#include "url.h"
+
+typedef struct UnixContext {
+    const AVClass *class;
+    struct sockaddr_un addr;
+    int timeout;
+    int listen;
+    int type;
+    int fd;
+} UnixContext;
+
+#define OFFSET(x) offsetof(UnixContext, x)
+#define ED AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption unix_options[] = {
+    { "listen",    "Open socket for listening",             OFFSET(listen),  AV_OPT_TYPE_INT,   { .i64 = 0 },                    0,       1, ED },
+    { "timeout",   "Timeout in ms",                         OFFSET(timeout), AV_OPT_TYPE_INT,   { .i64 = -1 },                  -1, INT_MAX, ED },
+    { "type",      "Socket type",                           OFFSET(type),    AV_OPT_TYPE_INT,   { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
+    { "stream",    "Stream (reliable stream-oriented)",     0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_STREAM },    INT_MIN, INT_MAX, ED, "type" },
+    { "datagram",  "Datagram (unreliable packet-oriented)", 0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_DGRAM },     INT_MIN, INT_MAX, ED, "type" },
+    { "seqpacket", "Seqpacket (reliable packet-oriented",   0,               AV_OPT_TYPE_CONST, { .i64 = SOCK_SEQPACKET }, INT_MIN, INT_MAX, ED, "type" },
+    { NULL }
+};
+
+static const AVClass unix_class = {
+    .class_name = "unix",
+    .item_name  = av_default_item_name,
+    .option     = unix_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static int unix_open(URLContext *h, const char *filename, int flags)
+{
+    UnixContext *s = h->priv_data;
+    int fd, ret;
+
+    av_strstart(filename, "unix:", &filename);
+    s->addr.sun_family = AF_UNIX;
+    av_strlcpy(s->addr.sun_path, filename, sizeof(s->addr.sun_path));
+
+    if ((fd = socket(AF_UNIX, s->type, 0)) < 0)
+        return ff_neterrno();
+
+    if (s->listen) {
+        fd = ff_listen_bind(fd, (struct sockaddr *)&s->addr,
+                            sizeof(s->addr), s->timeout, h);
+        if (fd < 0) {
+            ret = fd;
+            goto fail;
+        }
+    } else {
+        ret = ff_listen_connect(fd, (struct sockaddr *)&s->addr,
+                                sizeof(s->addr), s->timeout, h);
+        if (ret < 0)
+            goto fail;
+    }
+
+    s->fd = fd;
+
+    return 0;
+
+fail:
+    if (s->listen && ret != EADDRINUSE)
+        unlink(s->addr.sun_path);
+    if (fd >= 0)
+        closesocket(fd);
+    return ret;
+}
+
+static int unix_read(URLContext *h, uint8_t *buf, int size)
+{
+    UnixContext *s = h->priv_data;
+    int ret;
+
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->fd, 0);
+        if (ret < 0)
+            return ret;
+    }
+    ret = recv(s->fd, buf, size, 0);
+    return ret < 0 ? ff_neterrno() : ret;
+}
+
+static int unix_write(URLContext *h, const uint8_t *buf, int size)
+{
+    UnixContext *s = h->priv_data;
+    int ret;
+
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->fd, 1);
+        if (ret < 0)
+            return ret;
+    }
+    ret = send(s->fd, buf, size, 0);
+    return ret < 0 ? ff_neterrno() : ret;
+}
+
+static int unix_close(URLContext *h)
+{
+    UnixContext *s = h->priv_data;
+    if (s->listen)
+        unlink(s->addr.sun_path);
+    closesocket(s->fd);
+    return 0;
+}
+
+static int unix_get_file_handle(URLContext *h)
+{
+    UnixContext *s = h->priv_data;
+    return s->fd;
+}
+
+URLProtocol ff_unix_protocol = {
+    .name                = "unix",
+    .url_open            = unix_open,
+    .url_read            = unix_read,
+    .url_write           = unix_write,
+    .url_close           = unix_close,
+    .url_get_file_handle = unix_get_file_handle,
+    .priv_data_size      = sizeof(UnixContext),
+    .priv_data_class     = &unix_class,
+    .flags               = URL_PROTOCOL_FLAG_NETWORK,
+};