[vlc-devel] [PATCH v7 2/3] access_out:srt: introduce SRT ouput module
Justin Kim
justin.kim at collabora.com
Wed Sep 27 07:02:34 CEST 2017
The access_output_srt module is a SRT client to send a stream.
Signed-off-by: Justin Kim <justin.kim at collabora.com>
---
configure.ac | 2 +-
modules/MODULES_LIST | 1 +
modules/access_output/Makefile.am | 8 +
modules/access_output/srt.c | 327 ++++++++++++++++++++++++++++++++++++++
4 files changed, 337 insertions(+), 1 deletion(-)
create mode 100644 modules/access_output/srt.c
diff --git a/configure.ac b/configure.ac
index d15b690a10..19b3246e11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3881,7 +3881,7 @@ AM_CONDITIONAL([HAVE_LIRC], [test "${have_lirc}" = "yes"])
dnl
dnl SRT plugin
dnl
-PKG_ENABLE_MODULES_VLC([SRT], [access_srt], [srt >= 1.2.0], [SRT input plugin], [auto])
+PKG_ENABLE_MODULES_VLC([SRT], [access_srt access_output_srt], [srt >= 1.2.0], [SRT input/output plugin], [auto])
EXTEND_HELP_STRING([Visualisations and Video filter plugins:])
dnl
diff --git a/modules/MODULES_LIST b/modules/MODULES_LIST
index 0e117115a7..5fb499eda2 100644
--- a/modules/MODULES_LIST
+++ b/modules/MODULES_LIST
@@ -14,6 +14,7 @@ $Id$
* access_output_http: HTTP Network access module
* access_output_livehttp: Live HTTP stream output
* access_output_shout: Shoutcast access output
+ * access_output_srt: SRT (Secure Reliable Transport) access_output module
* access_output_udp: UDP Network access_output module
* access_qtsound: Quicktime Audio Capture
* access_realrtsp: Real RTSP access
diff --git a/modules/access_output/Makefile.am b/modules/access_output/Makefile.am
index 7c9311646c..bc954ee03b 100644
--- a/modules/access_output/Makefile.am
+++ b/modules/access_output/Makefile.am
@@ -26,3 +26,11 @@ libaccess_output_shout_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(access_outdir
libaccess_output_shout_plugin_la_LIBADD = $(SHOUT_LIBS) $(SOCKET_LIBS)
access_out_LTLIBRARIES += $(LTLIBaccess_output_shout)
EXTRA_LTLIBRARIES += libaccess_output_shout_plugin.la
+
+### SRT ###
+libaccess_output_srt_plugin_la_SOURCES = access_output/srt.c
+libaccess_output_srt_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(SRT_CPPFLAGS)
+libaccess_output_srt_plugin_la_LIBADD = $(SRT_LIBS) $(LIBPTHREAD)
+libaccess_output_srt_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(access_outdir)'
+access_out_LTLIBRARIES += $(LTLIBaccess_output_srt)
+EXTRA_LTLIBRARIES += libaccess_output_srt_plugin.la
diff --git a/modules/access_output/srt.c b/modules/access_output/srt.c
new file mode 100644
index 0000000000..803d270fae
--- /dev/null
+++ b/modules/access_output/srt.c
@@ -0,0 +1,327 @@
+/*****************************************************************************
+ * srt.c: SRT (Secure Reliable Transport) output module
+ *****************************************************************************
+ * Copyright (C) 2017, Collabora Ltd.
+ *
+ * Authors: Justin Kim <justin.kim at collabora.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <errno.h>
+#include <sys/eventfd.h>
+#include <sys/epoll.h>
+
+#include <vlc_common.h>
+#include <vlc_interrupt.h>
+#include <vlc_plugin.h>
+#include <vlc_sout.h>
+#include <vlc_block.h>
+#include <vlc_network.h>
+
+#include <srt/srt.h>
+
+/* libsrt defines default packet size as 1316 internally
+ * so srt module takes same value. */
+#define SRT_DEFAULT_CHUNK_SIZE 1316
+/* libsrt tutorial uses 9000 as a default binding port */
+#define SRT_DEFAULT_PORT 9000
+/* The default timeout is -1 (infinite) */
+#define SRT_DEFAULT_POLL_TIMEOUT 100
+/* The default latency is 125
+ * which uses srt library internally */
+#define SRT_DEFAULT_LATENCY 125
+
+struct sout_access_out_sys_t
+{
+ SRTSOCKET sock;
+ int i_poll_id;
+ int i_poll_timeout;
+ int i_latency;
+ size_t i_chunk_size;
+ int i_event_fd;
+};
+
+static void srt_wait_interrupted(void *p_data)
+{
+ sout_access_out_t *p_access = p_data;
+ sout_access_out_sys_t *p_sys = p_access->p_sys;
+ msg_Dbg( p_access, "Waking up srt_epoll_wait");
+ if ( write( p_sys->i_event_fd, &( bool ) { true }, sizeof( bool ) ) < 0 )
+ {
+ msg_Err( p_access, "Failed to send data to event fd");
+ }
+}
+
+static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
+{
+ sout_access_out_sys_t *p_sys = p_access->p_sys;
+ int i_len = 0;
+
+ vlc_interrupt_register( srt_wait_interrupted, p_access);
+
+ while( p_buffer )
+ {
+ block_t *p_next;
+
+ i_len += p_buffer->i_buffer;
+
+ while( p_buffer->i_buffer )
+ {
+ size_t i_write = __MIN( p_buffer->i_buffer, p_sys->i_chunk_size );
+ SRTSOCKET ready[2];
+
+ struct epoll_event event[1] = { 0 };
+retry:
+ if ( srt_epoll_wait( p_sys->i_poll_id,
+ 0, 0, ready, &(int){ 2 }, p_sys->i_poll_timeout,
+ &(int) { p_sys->i_event_fd }, &(int) { 1 }, 0, 0 ) == -1 )
+ {
+ /* Assuming that timeout error is normal when SRT socket is connected. */
+ if ( srt_getlasterror( NULL ) == SRT_ETIMEOUT && srt_getsockstate( p_sys->sock ) == SRTS_CONNECTED )
+ {
+ srt_clearlasterror();
+ goto retry;
+ }
+
+ i_len = VLC_EGENERIC;
+ goto out;
+ }
+
+ if ( event[0].events & EPOLLIN )
+ {
+ bool cancel = 0;
+ int ret = read( event[0].data.fd, &cancel, sizeof( bool ) );
+ if ( ret < 0 )
+ {
+ goto retry;
+ }
+
+ if ( cancel )
+ {
+ msg_Dbg( p_access, "Cancelled running" );
+ i_len = 0;
+ goto out;
+ }
+ }
+
+ if ( srt_sendmsg2( p_sys->sock, (char *)p_buffer->p_buffer, i_write, 0 ) == SRT_ERROR )
+ msg_Warn( p_access, "send error: %s", srt_getlasterror_str() );
+
+ p_buffer->p_buffer += i_write;
+ p_buffer->i_buffer -= i_write;
+ }
+
+ p_next = p_buffer->p_next;
+ block_Release( p_buffer );
+ p_buffer = p_next;
+ }
+
+out:
+ vlc_interrupt_unregister();
+ if ( i_len <= 0 ) block_ChainRelease( p_buffer );
+ return i_len;
+}
+
+static int Control( sout_access_out_t *p_access, int i_query, va_list args )
+{
+ sout_access_out_sys_t *p_sys = p_access->p_sys;
+ int i_ret = VLC_SUCCESS;
+
+ switch( i_query )
+ {
+ case ACCESS_OUT_CONTROLS_PACE:
+ *va_arg( args, bool * ) = false;
+ break;
+
+ default:
+ i_ret = VLC_EGENERIC;
+ break;
+ }
+
+ return i_ret;
+}
+
+static int Open( vlc_object_t *p_this )
+{
+ sout_access_out_t *p_access = (sout_access_out_t*)p_this;
+ sout_access_out_sys_t *p_sys = NULL;
+
+ char *psz_dst_addr = NULL;
+ int i_dst_port;
+ int stat;
+
+ struct addrinfo hints = {
+ .ai_socktype = SOCK_DGRAM,
+ }, *res = NULL;
+
+ if (var_Create ( p_access, "dst-port", VLC_VAR_INTEGER )
+ || var_Create ( p_access, "src-port", VLC_VAR_INTEGER )
+ || var_Create ( p_access, "dst-addr", VLC_VAR_STRING )
+ || var_Create ( p_access, "src-addr", VLC_VAR_STRING ) )
+ {
+ msg_Err( p_access, "Valid network information is required." );
+ return VLC_ENOMEM;
+ }
+
+ if( !( p_sys = malloc ( sizeof( *p_sys ) ) ) )
+ return VLC_ENOMEM;
+
+ p_sys->i_chunk_size = var_InheritInteger( p_access, "chunk-size" );
+ p_sys->i_poll_timeout = var_InheritInteger( p_access, "poll-timeout" );
+ p_sys->i_latency = var_InheritInteger( p_stream, "latency" );
+ p_sys->i_poll_id = -1;
+ p_sys->i_event_fd = -1;
+
+ p_access->p_sys = p_sys;
+
+ i_dst_port = SRT_DEFAULT_PORT;
+ char *psz_parser = psz_dst_addr = strdup( p_access->psz_path );
+ if( !psz_dst_addr )
+ {
+ free( p_sys );
+ return VLC_ENOMEM;
+ }
+
+ if (psz_parser[0] == '[')
+ psz_parser = strchr (psz_parser, ']');
+
+ psz_parser = strchr (psz_parser ? psz_parser : psz_dst_addr, ':');
+ if (psz_parser != NULL)
+ {
+ *psz_parser++ = '\0';
+ i_dst_port = atoi (psz_parser);
+ }
+
+ msg_Dbg( p_access, "Setting SRT socket (dest addresss: %s, port: %d).",
+ psz_dst_addr, i_dst_port );
+
+ stat = vlc_getaddrinfo( psz_dst_addr, i_dst_port, &hints, &res );
+ if ( stat )
+ {
+ msg_Err( p_access, "Cannot resolve [%s]:%d (reason: %s)",
+ psz_dst_addr,
+ i_dst_port,
+ gai_strerror( stat ) );
+
+ goto failed;
+ }
+
+ p_sys->sock = srt_socket( res->ai_family, SOCK_DGRAM, 0 );
+ if ( p_sys->sock == SRT_ERROR )
+ {
+ msg_Err( p_access, "Failed to open socket." );
+ goto failed;
+ }
+
+ /* Make SRT non-blocking */
+ srt_setsockopt( p_sys->sock, 0, SRTO_SNDSYN, &(bool) { false }, sizeof( bool ) );
+
+ /* Make sure TSBPD mode is enable (SRT mode) */
+ srt_setsockopt( p_sys->sock, 0, SRTO_TSBPDMODE, &(int) { 1 }, sizeof( int ) );
+
+ /* This is an access_out so it is always a sender */
+ srt_setsockopt( p_sys->sock, 0, SRTO_SENDER, &(int) { 1 }, sizeof( int ) );
+
+ /* Set latency */
+ srt_setsockopt( p_sys->sock, 0, SRTO_TSBPDDELAY, &p_sys->latency, sizeof( int ) );
+
+ p_sys->i_poll_id = srt_epoll_create();
+ if ( p_sys->i_poll_id == -1 )
+ {
+ msg_Err( p_access, "Failed to create poll id for SRT socket (reason: %s)",
+ srt_getlasterror_str() );
+
+ goto failed;
+ }
+
+ srt_epoll_add_usock( p_sys->i_poll_id, p_sys->sock, &(int) { SRT_EPOLL_OUT });
+ srt_setsockopt( p_sys->sock, 0, SRTO_SENDER, &(int) { 1 }, sizeof(int) );
+
+ p_sys->i_event_fd = eventfd( 0, EFD_NONBLOCK | EFD_CLOEXEC );
+ srt_epoll_add_ssock( p_sys->i_poll_id, p_sys->i_event_fd, &(int) { EPOLLIN } );
+
+ stat = srt_connect( p_sys->sock, res->ai_addr, sizeof (struct sockaddr));
+ if ( stat == SRT_ERROR )
+ {
+ msg_Err( p_access, "Failed to connect to server (reason: %s)",
+ srt_getlasterror_str() );
+ goto failed;
+ }
+
+ p_access->pf_write = Write;
+ p_access->pf_control = Control;
+
+ free( psz_dst_addr );
+ freeaddrinfo( res );
+
+ return VLC_SUCCESS;
+
+failed:
+ if ( psz_dst_addr != NULL)
+ free( psz_dst_addr );
+
+ if ( res != NULL )
+ freeaddrinfo( res );
+
+ if ( p_sys != NULL )
+ {
+ if ( p_sys->i_poll_id != -1 ) srt_epoll_release( p_sys->i_poll_id );
+ if ( p_sys->sock != -1 ) srt_close( p_sys->sock );
+ if ( p_sys->i_event_fd != -1 ) close( p_sys->i_event_fd );
+
+ free( p_sys );
+ }
+
+ return VLC_EGENERIC;
+}
+
+static void Close( vlc_object_t * p_this )
+{
+ sout_access_out_t *p_access = (sout_access_out_t*)p_this;
+ sout_access_out_sys_t *p_sys = p_access->p_sys;
+
+ srt_epoll_release( p_sys->i_poll_id );
+ srt_close( p_sys->sock );
+
+ if ( p_sys->i_event_fd != -1 )
+ {
+ close( p_sys->i_event_fd );
+ p_sys->i_event_fd = -1;
+ }
+
+ free( p_sys );
+}
+
+/* Module descriptor */
+vlc_module_begin()
+ set_shortname( N_("SRT") )
+ set_description( N_("SRT stream output") )
+ set_category( CAT_SOUT )
+ set_subcategory( SUBCAT_SOUT_ACO )
+
+ add_integer( "chunk-size", SRT_DEFAULT_CHUNK_SIZE, N_("SRT chunk size (bytes)"), NULL, true )
+ add_integer( "poll-timeout", SRT_DEFAULT_POLL_TIMEOUT, N_("Return poll wait after timeout miliseconds (-1 = infinite)"), NULL, true )
+ add_integer( "latency", SRT_DEFAULT_LATENCY, N_("SRT latency (ms)"), NULL, true )
+
+ set_capability( "sout access", 0 )
+ add_shortcut( "srt" )
+
+ set_callbacks( Open, Close )
+vlc_module_end ()
--
2.14.1
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