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455 lines
14 KiB
455 lines
14 KiB
/*****************************************************************************
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* srt.c: SRT (Secure Reliable Transport) access module
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*****************************************************************************
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* Copyright (C) 2017-2018, Collabora Ltd.
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* Copyright (C) 2018, Haivision Systems Inc.
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*
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* Authors: Justin Kim <justin.kim@collabora.com>
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* Roman Diouskine <rdiouskine@haivision.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include "srt_common.h"
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#include <vlc_fs.h>
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#include <vlc_plugin.h>
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#include <vlc_access.h>
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#include <vlc_interrupt.h>
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#include <vlc_network.h>
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#include <vlc_url.h>
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typedef struct
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{
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SRTSOCKET sock;
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int i_poll_id;
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vlc_mutex_t lock;
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bool b_interrupted;
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char *psz_host;
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int i_port;
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int i_chunks; /* Number of chunks to allocate in the next read */
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} stream_sys_t;
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static void srt_wait_interrupted(void *p_data)
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{
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stream_t *p_stream = p_data;
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stream_sys_t *p_sys = p_stream->p_sys;
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vlc_mutex_lock( &p_sys->lock );
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if ( p_sys->i_poll_id >= 0 && p_sys->sock != SRT_INVALID_SOCK )
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{
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p_sys->b_interrupted = true;
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msg_Dbg( p_stream, "Waking up srt_epoll_wait");
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/* Removing all socket descriptors from the monitoring list
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* wakes up SRT's threads. We only have one to remove. */
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srt_epoll_remove_usock( p_sys->i_poll_id, p_sys->sock );
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}
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vlc_mutex_unlock( &p_sys->lock );
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}
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static int Control(stream_t *p_stream, int i_query, va_list args)
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{
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int i_ret = VLC_SUCCESS;
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switch( i_query )
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{
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case STREAM_CAN_SEEK:
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case STREAM_CAN_FASTSEEK:
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case STREAM_CAN_PAUSE:
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case STREAM_CAN_CONTROL_PACE:
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*va_arg( args, bool * ) = false;
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break;
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case STREAM_GET_PTS_DELAY:
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*va_arg( args, vlc_tick_t * ) = VLC_TICK_FROM_MS(
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var_InheritInteger(p_stream, "network-caching") );
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break;
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default:
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i_ret = VLC_EGENERIC;
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break;
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}
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return i_ret;
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}
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static bool srt_schedule_reconnect(stream_t *p_stream)
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{
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vlc_object_t *strm_obj = (vlc_object_t *) p_stream;
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int i_latency=var_InheritInteger( p_stream, SRT_PARAM_LATENCY );
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int i_payload_size = var_InheritInteger( p_stream, SRT_PARAM_PAYLOAD_SIZE );
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int stat;
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char *psz_passphrase = var_InheritString( p_stream, SRT_PARAM_PASSPHRASE );
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bool passphrase_needs_free = true;
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char *psz_streamid = var_InheritString( p_stream, SRT_PARAM_STREAMID );
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bool streamid_needs_free = true;
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char *url = NULL;
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srt_params_t params;
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struct addrinfo hints = {
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.ai_socktype = SOCK_DGRAM,
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}, *res = NULL;
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stream_sys_t *p_sys = p_stream->p_sys;
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bool failed = false;
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stat = vlc_getaddrinfo( p_sys->psz_host, p_sys->i_port, &hints, &res );
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if ( stat )
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{
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msg_Err( p_stream, "Cannot resolve [%s]:%d (reason: %s)",
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p_sys->psz_host,
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p_sys->i_port,
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gai_strerror( stat ) );
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failed = true;
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goto out;
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}
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/* Always start with a fresh socket */
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if (p_sys->sock != SRT_INVALID_SOCK)
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{
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srt_epoll_remove_usock( p_sys->i_poll_id, p_sys->sock );
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srt_close( p_sys->sock );
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}
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p_sys->sock = srt_socket( res->ai_family, SOCK_DGRAM, 0 );
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if ( p_sys->sock == SRT_INVALID_SOCK )
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{
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msg_Err( p_stream, "Failed to open socket." );
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failed = true;
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goto out;
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}
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if (p_stream->psz_url) {
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url = strdup( p_stream->psz_url );
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if (srt_parse_url( url, ¶ms )) {
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if (params.latency != -1)
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i_latency = params.latency;
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if (params.payload_size != -1)
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i_payload_size = params.payload_size;
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if (params.passphrase != NULL) {
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free( psz_passphrase );
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passphrase_needs_free = false;
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psz_passphrase = (char *) params.passphrase;
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}
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if (params.streamid != NULL ) {
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free( psz_streamid );
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streamid_needs_free = false;
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psz_streamid = (char *) params.streamid;
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}
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}
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}
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/* Make SRT non-blocking */
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srt_setsockopt( p_sys->sock, 0, SRTO_SNDSYN,
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&(bool) { false }, sizeof( bool ) );
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srt_setsockopt( p_sys->sock, 0, SRTO_RCVSYN,
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&(bool) { false }, sizeof( bool ) );
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/* Make sure TSBPD mode is enable (SRT mode) */
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srt_setsockopt( p_sys->sock, 0, SRTO_TSBPDMODE,
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&(int) { 1 }, sizeof( int ) );
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/* This is an access module so it is always a receiver */
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srt_setsockopt( p_sys->sock, 0, SRTO_SENDER,
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&(int) { 0 }, sizeof( int ) );
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/* Set latency */
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srt_set_socket_option( strm_obj, SRT_PARAM_LATENCY, p_sys->sock,
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SRTO_LATENCY, &i_latency, sizeof(i_latency) );
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/* set passphrase */
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if (psz_passphrase != NULL && psz_passphrase[0] != '\0') {
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int i_key_length = var_InheritInteger( p_stream, SRT_PARAM_KEY_LENGTH );
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srt_set_socket_option( strm_obj, SRT_PARAM_KEY_LENGTH, p_sys->sock,
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SRTO_PBKEYLEN, &i_key_length, sizeof(i_key_length) );
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srt_set_socket_option( strm_obj, SRT_PARAM_PASSPHRASE, p_sys->sock,
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SRTO_PASSPHRASE, psz_passphrase, strlen(psz_passphrase) );
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}
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/* set stream id */
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if (psz_streamid != NULL && psz_streamid[0] != '\0') {
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srt_set_socket_option( strm_obj, SRT_PARAM_STREAMID, p_sys->sock,
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SRTO_STREAMID, psz_streamid, strlen(psz_streamid) );
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}
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/* set maximum payload size */
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srt_set_socket_option( strm_obj, SRT_PARAM_PAYLOAD_SIZE, p_sys->sock,
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SRTO_PAYLOADSIZE, &i_payload_size, sizeof(i_payload_size) );
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srt_epoll_add_usock( p_sys->i_poll_id, p_sys->sock,
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&(int) { SRT_EPOLL_ERR | SRT_EPOLL_IN });
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/* Schedule a connect */
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msg_Dbg( p_stream, "Schedule SRT connect (dest addresss: %s, port: %d).",
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p_sys->psz_host, p_sys->i_port);
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stat = srt_connect( p_sys->sock, res->ai_addr, res->ai_addrlen );
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if (stat == SRT_ERROR) {
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msg_Err( p_stream, "Failed to connect to server (reason: %s)",
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srt_getlasterror_str() );
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failed = true;
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}
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/* Reset the number of chunks to allocate as the bitrate of
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* the stream may have changed.
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*/
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p_sys->i_chunks = SRT_MIN_CHUNKS_TRYREAD;
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out:
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if (failed && p_sys->sock != SRT_INVALID_SOCK)
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{
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srt_epoll_remove_usock( p_sys->i_poll_id, p_sys->sock );
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srt_close(p_sys->sock);
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p_sys->sock = SRT_INVALID_SOCK;
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}
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if (passphrase_needs_free)
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free( psz_passphrase );
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if (streamid_needs_free)
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free( psz_streamid );
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freeaddrinfo( res );
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free( url );
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return !failed;
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}
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static block_t *BlockSRT(stream_t *p_stream, bool *restrict eof)
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{
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stream_sys_t *p_sys = p_stream->p_sys;
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int i_chunk_size = var_InheritInteger( p_stream, SRT_PARAM_CHUNK_SIZE );
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int i_poll_timeout = var_InheritInteger( p_stream, SRT_PARAM_POLL_TIMEOUT );
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/* SRT doesn't have a concept of EOF for live streams. */
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VLC_UNUSED(eof);
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if ( vlc_killed() )
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{
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/* We are told to stop. Stop. */
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return NULL;
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}
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if ( p_sys->i_chunks == 0 )
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p_sys->i_chunks = SRT_MIN_CHUNKS_TRYREAD;
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size_t i_chunk_size_actual = ( i_chunk_size > 0 )
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? i_chunk_size : SRT_DEFAULT_CHUNK_SIZE;
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size_t bufsize = i_chunk_size_actual * p_sys->i_chunks;
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block_t *pkt = block_Alloc( bufsize );
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if ( unlikely( pkt == NULL ) )
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{
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return NULL;
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}
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vlc_interrupt_register( srt_wait_interrupted, p_stream);
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SRTSOCKET ready[1];
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int readycnt = 1;
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while ( srt_epoll_wait( p_sys->i_poll_id,
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ready, &readycnt, 0, 0,
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i_poll_timeout, NULL, 0, NULL, 0 ) >= 0)
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{
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if ( readycnt < 0 || ready[0] != p_sys->sock )
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{
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/* should never happen, force recovery */
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srt_close(p_sys->sock);
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p_sys->sock = SRT_INVALID_SOCK;
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}
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switch( srt_getsockstate( p_sys->sock ) )
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{
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case SRTS_CONNECTED:
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/* Good to go */
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break;
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case SRTS_BROKEN:
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case SRTS_NONEXIST:
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case SRTS_CLOSED:
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/* Failed. Schedule recovery. */
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if ( !srt_schedule_reconnect( p_stream ) )
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msg_Err( p_stream, "Failed to schedule connect" );
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/* Fall-through */
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default:
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/* Not ready */
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continue;
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}
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/* Try to get as much data as possible out of the lib, if there
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* is still some left, increase the number of chunks to read so that
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* it will read faster on the next iteration. This way the buffer will
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* grow until it reads fast enough to keep the library empty after
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* each iteration.
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*/
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pkt->i_buffer = 0;
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while ( ( bufsize - pkt->i_buffer ) >= i_chunk_size_actual )
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{
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int stat = srt_recvmsg( p_sys->sock,
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(char *)( pkt->p_buffer + pkt->i_buffer ),
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bufsize - pkt->i_buffer );
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if ( stat <= 0 )
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{
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break;
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}
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pkt->i_buffer += (size_t)stat;
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}
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msg_Dbg ( p_stream, "Read %zu bytes out of a max of %zu"
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" (%d chunks of %zu bytes)", pkt->i_buffer,
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p_sys->i_chunks * i_chunk_size_actual, p_sys->i_chunks,
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i_chunk_size_actual );
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/* Gradually adjust number of chunks we read at a time
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* up to a predefined maximum. The actual number we might
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* settle on depends on stream's bit rate.
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*/
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size_t rem = bufsize - pkt->i_buffer;
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if ( rem < i_chunk_size_actual )
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{
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if ( p_sys->i_chunks < SRT_MAX_CHUNKS_TRYREAD )
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{
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p_sys->i_chunks++;
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}
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}
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goto out;
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}
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/* if the poll reports errors for any reason at all,
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* including a timeout, we skip the turn.
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*/
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pkt->i_buffer = 0;
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out:
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if (pkt->i_buffer == 0) {
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block_Release(pkt);
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pkt = NULL;
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}
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vlc_interrupt_unregister();
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/* Re-add the socket to the poll if we were interrupted */
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vlc_mutex_lock( &p_sys->lock );
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if ( p_sys->b_interrupted )
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{
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srt_epoll_add_usock( p_sys->i_poll_id, p_sys->sock,
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&(int) { SRT_EPOLL_ERR | SRT_EPOLL_IN } );
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p_sys->b_interrupted = false;
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}
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vlc_mutex_unlock( &p_sys->lock );
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return pkt;
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}
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static int Open(vlc_object_t *p_this)
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{
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stream_t *p_stream = (stream_t*)p_this;
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stream_sys_t *p_sys = NULL;
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vlc_url_t parsed_url = { 0 };
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p_sys = vlc_obj_calloc( p_this, 1, sizeof( *p_sys ) );
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if( unlikely( p_sys == NULL ) )
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return VLC_ENOMEM;
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srt_startup();
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vlc_mutex_init( &p_sys->lock );
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p_stream->p_sys = p_sys;
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if ( vlc_UrlParse( &parsed_url, p_stream->psz_url ) == -1 )
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{
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msg_Err( p_stream, "Failed to parse input URL (%s)",
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p_stream->psz_url );
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goto failed;
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}
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p_sys->psz_host = vlc_obj_strdup( p_this, parsed_url.psz_host );
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p_sys->i_port = parsed_url.i_port;
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vlc_UrlClean( &parsed_url );
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p_sys->i_poll_id = srt_epoll_create();
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if ( p_sys->i_poll_id == -1 )
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{
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msg_Err( p_stream, "Failed to create poll id for SRT socket." );
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goto failed;
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}
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if ( !srt_schedule_reconnect( p_stream ) )
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{
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msg_Err( p_stream, "Failed to schedule connect");
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goto failed;
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}
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p_stream->pf_block = BlockSRT;
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p_stream->pf_control = Control;
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return VLC_SUCCESS;
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failed:
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if ( p_sys->sock != -1 ) srt_close( p_sys->sock );
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if ( p_sys->i_poll_id != -1 ) srt_epoll_release( p_sys->i_poll_id );
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return VLC_EGENERIC;
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}
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static void Close(vlc_object_t *p_this)
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{
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stream_t *p_stream = (stream_t*)p_this;
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stream_sys_t *p_sys = p_stream->p_sys;
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srt_epoll_remove_usock( p_sys->i_poll_id, p_sys->sock );
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srt_close( p_sys->sock );
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srt_epoll_release( p_sys->i_poll_id );
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srt_cleanup();
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}
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/* Module descriptor */
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vlc_module_begin ()
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set_shortname( N_( "SRT" ) )
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set_description( N_( "SRT input" ) )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_ACCESS )
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add_integer( SRT_PARAM_CHUNK_SIZE, SRT_DEFAULT_CHUNK_SIZE,
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N_( "SRT chunk size (bytes)" ), NULL )
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add_integer( SRT_PARAM_POLL_TIMEOUT, SRT_DEFAULT_POLL_TIMEOUT,
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N_( "Return poll wait after timeout milliseconds (-1 = infinite)" ),
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NULL )
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add_integer( SRT_PARAM_LATENCY, SRT_DEFAULT_LATENCY,
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N_( "SRT latency (ms)" ), NULL )
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add_password( SRT_PARAM_PASSPHRASE, "",
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N_( "Password for stream encryption" ), NULL )
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add_integer( SRT_PARAM_PAYLOAD_SIZE, SRT_DEFAULT_PAYLOAD_SIZE,
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N_( "SRT maximum payload size (bytes)" ), NULL )
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add_integer( SRT_PARAM_KEY_LENGTH, SRT_DEFAULT_KEY_LENGTH,
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SRT_KEY_LENGTH_TEXT, NULL )
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change_integer_list( srt_key_lengths, srt_key_length_names )
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add_string(SRT_PARAM_STREAMID, "",
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N_(" SRT Stream ID"), NULL)
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change_safe()
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set_capability("access", 0)
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add_shortcut("srt")
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set_callbacks(Open, Close)
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vlc_module_end ()
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