rtp.c 17.2 KB
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/**
 * @file rtp.c
 * @brief Real-Time Protocol (RTP) demux module for VLC media player
 */
/*****************************************************************************
 * Copyright (C) 2001-2005 the VideoLAN team
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 * Copyright © 2007-2009 Rémi Denis-Courmont
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 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2.0
 * of the License, or (at your option) any later version.
 *
 * This library 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 ****************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdarg.h>
#include <assert.h>

#include <vlc_common.h>
#include <vlc_demux.h>
#include <vlc_aout.h>
#include <vlc_network.h>
#include <vlc_plugin.h>

#include <vlc_codecs.h>

#include "rtp.h"
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#include <srtp.h>
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#define RTP_CACHING_TEXT N_("RTP de-jitter buffer length (msec)")
#define RTP_CACHING_LONGTEXT N_( \
    "How long to wait for late RTP packets (and delay the performance)." )

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#define RTCP_PORT_TEXT N_("RTCP (local) port")
#define RTCP_PORT_LONGTEXT N_( \
    "RTCP packets will be received on this transport protocol port. " \
    "If zero, multiplexed RTP/RTCP is used.")

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#define SRTP_KEY_TEXT N_("SRTP key (hexadecimal)")
#define SRTP_KEY_LONGTEXT N_( \
    "RTP packets will be authenticated and deciphered "\
    "with this Secure RTP master shared secret key.")

#define SRTP_SALT_TEXT N_("SRTP salt (hexadecimal)")
#define SRTP_SALT_LONGTEXT N_( \
    "Secure RTP requires a (non-secret) master salt value.")

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#define RTP_MAX_SRC_TEXT N_("Maximum RTP sources")
#define RTP_MAX_SRC_LONGTEXT N_( \
    "How many distinct active RTP sources are allowed at a time." )

#define RTP_TIMEOUT_TEXT N_("RTP source timeout (sec)")
#define RTP_TIMEOUT_LONGTEXT N_( \
    "How long to wait for any packet before a source is expired.")

#define RTP_MAX_DROPOUT_TEXT N_("Maximum RTP sequence number dropout")
#define RTP_MAX_DROPOUT_LONGTEXT N_( \
    "RTP packets will be discarded if they are too much ahead (i.e. in the " \
    "future) by this many packets from the last received packet." )

#define RTP_MAX_MISORDER_TEXT N_("Maximum RTP sequence number misordering")
#define RTP_MAX_MISORDER_LONGTEXT N_( \
    "RTP packets will be discarded if they are too far behind (i.e. in the " \
    "past) by this many packets from the last received packet." )

static int  Open (vlc_object_t *);
static void Close (vlc_object_t *);

/*
 * Module descriptor
 */
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vlc_module_begin ()
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    set_shortname (N_("RTP"))
    set_description (N_("Real-Time Protocol (RTP) input"))
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    set_category (CAT_INPUT)
    set_subcategory (SUBCAT_INPUT_DEMUX)
    set_capability ("access_demux", 0)
    set_callbacks (Open, Close)
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    add_integer ("rtp-caching", 1000, NULL, RTP_CACHING_TEXT,
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                 RTP_CACHING_LONGTEXT, true)
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        change_integer_range (0, 65535)
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    add_integer ("rtcp-port", 0, NULL, RTCP_PORT_TEXT,
                 RTCP_PORT_LONGTEXT, false)
        change_integer_range (0, 65535)
        change_safe ()
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    add_string ("srtp-key", "", NULL,
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                SRTP_KEY_TEXT, SRTP_KEY_LONGTEXT, false)
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    add_string ("srtp-salt", "", NULL,
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                SRTP_SALT_TEXT, SRTP_SALT_LONGTEXT, false)
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    add_integer ("rtp-max-src", 1, NULL, RTP_MAX_SRC_TEXT,
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                 RTP_MAX_SRC_LONGTEXT, true)
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        change_integer_range (1, 255)
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    add_integer ("rtp-timeout", 5, NULL, RTP_TIMEOUT_TEXT,
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                 RTP_TIMEOUT_LONGTEXT, true)
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    add_integer ("rtp-max-dropout", 3000, NULL, RTP_MAX_DROPOUT_TEXT,
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                 RTP_MAX_DROPOUT_LONGTEXT, true)
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        change_integer_range (0, 32767)
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    add_integer ("rtp-max-misorder", 100, NULL, RTP_MAX_MISORDER_TEXT,
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                 RTP_MAX_MISORDER_LONGTEXT, true)
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        change_integer_range (0, 32767)

    add_shortcut ("dccp")
    /*add_shortcut ("sctp")*/
    add_shortcut ("rtptcp") /* "tcp" is already taken :( */
    add_shortcut ("rtp")
    add_shortcut ("udplite")
vlc_module_end ()
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/*
 * TODO: so much stuff
 * - send RTCP-RR and RTCP-BYE
 * - dynamic payload types (need SDP parser)
 * - multiple medias (need SDP parser, and RTCP-SR parser for lip-sync)
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 * - support for stream_filter in case of stream_Demux (MPEG-TS)
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 */

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#ifndef IPPROTO_DCCP
# define IPPROTO_DCCP 33 /* IANA */
#endif

#ifndef IPPROTO_UDPLITE
# define IPPROTO_UDPLITE 136 /* from IANA */
#endif


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/*
 * Local prototypes
 */
static int Demux (demux_t *);
static int Control (demux_t *, int i_query, va_list args);
static int extract_port (char **phost);

/**
 * Probes and initializes.
 */
static int Open (vlc_object_t *obj)
{
    demux_t *demux = (demux_t *)obj;
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    int tp; /* transport protocol */

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    if (!strcmp (demux->psz_access, "dccp"))
        tp = IPPROTO_DCCP;
    else
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    if (!strcmp (demux->psz_access, "rtptcp"))
        tp = IPPROTO_TCP;
    else
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    if (!strcmp (demux->psz_access, "rtp"))
        tp = IPPROTO_UDP;
    else
    if (!strcmp (demux->psz_access, "udplite"))
        tp = IPPROTO_UDPLITE;
    else
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        return VLC_EGENERIC;

    char *tmp = strdup (demux->psz_path);
    char *shost = tmp;
    if (shost == NULL)
        return VLC_ENOMEM;

    char *dhost = strchr (shost, '@');
    if (dhost)
        *dhost++ = '\0';

    /* Parses the port numbers */
    int sport = 0, dport = 0;
    sport = extract_port (&shost);
    if (dhost != NULL)
        dport = extract_port (&dhost);
    if (dport == 0)
        dport = 5004; /* avt-profile-1 port */

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    int rtcp_dport = var_CreateGetInteger (obj, "rtcp-port");

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    /* Try to connect */
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    int fd = -1, rtcp_fd = -1;
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    switch (tp)
    {
        case IPPROTO_UDP:
        case IPPROTO_UDPLITE:
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            fd = net_OpenDgram (obj, dhost, dport,
                                shost, sport, AF_UNSPEC, tp);
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            if (fd == -1)
                break;
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            if (rtcp_dport > 0) /* XXX: source port is unknown */
                rtcp_fd = net_OpenDgram (obj, dhost, rtcp_dport, shost, 0,
                                         AF_UNSPEC, tp);
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            break;

         case IPPROTO_DCCP:
#ifndef SOCK_DCCP /* provisional API (FIXME) */
# ifdef __linux__
#  define SOCK_DCCP 6
# endif
#endif
#ifdef SOCK_DCCP
            var_Create (obj, "dccp-service", VLC_VAR_STRING);
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            var_SetString (obj, "dccp-service", "RTPV"); /* FIXME: RTPA? */
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            fd = net_Connect (obj, shost, sport, SOCK_DCCP, tp);
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#else
            msg_Err (obj, "DCCP support not included");
#endif
            break;
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        case IPPROTO_TCP:
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            fd = net_Connect (obj, shost, sport, SOCK_STREAM, tp);
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            break;
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    }

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    free (tmp);
    if (fd == -1)
        return VLC_EGENERIC;
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    net_SetCSCov (fd, -1, 12);
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    /* Initializes demux */
    demux_sys_t *p_sys = malloc (sizeof (*p_sys));
    if (p_sys == NULL)
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    {
        net_Close (fd);
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        if (rtcp_fd != -1)
            net_Close (rtcp_fd);
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        return VLC_EGENERIC;
    }
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    vlc_mutex_init (&p_sys->lock);
    vlc_cond_init (&p_sys->wait);
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    p_sys->srtp         = NULL;
    p_sys->fd           = fd;
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    p_sys->rtcp_fd      = rtcp_fd;
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    p_sys->caching      = var_CreateGetInteger (obj, "rtp-caching");
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    p_sys->max_src      = var_CreateGetInteger (obj, "rtp-max-src");
    p_sys->timeout      = var_CreateGetInteger (obj, "rtp-timeout");
    p_sys->max_dropout  = var_CreateGetInteger (obj, "rtp-max-dropout");
    p_sys->max_misorder = var_CreateGetInteger (obj, "rtp-max-misorder");
    p_sys->autodetect   = true;
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    p_sys->framed_rtp   = (tp == IPPROTO_TCP);
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    p_sys->dead         = false;
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    demux->pf_demux   = Demux;
    demux->pf_control = Control;
    demux->p_sys      = p_sys;

    p_sys->session = rtp_session_create (demux);
    if (p_sys->session == NULL)
        goto error;

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    char *key = var_CreateGetNonEmptyString (demux, "srtp-key");
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    if (key)
    {
        p_sys->srtp = srtp_create (SRTP_ENCR_AES_CM, SRTP_AUTH_HMAC_SHA1, 10,
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                                   SRTP_PRF_AES_CM, SRTP_RCC_MODE1);
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        if (p_sys->srtp == NULL)
        {
            free (key);
            goto error;
        }

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        char *salt = var_CreateGetNonEmptyString (demux, "srtp-salt");
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        errno = srtp_setkeystring (p_sys->srtp, key, salt ? salt : "");
        free (salt);
        free (key);
        if (errno)
        {
            msg_Err (obj, "bad SRTP key/salt combination (%m)");
            goto error;
        }
    }

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    if (vlc_clone (&p_sys->thread, rtp_thread, demux,
                   VLC_THREAD_PRIORITY_INPUT))
        goto error;
    p_sys->thread_ready = true;
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    return VLC_SUCCESS;

error:
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    Close (obj);
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    return VLC_EGENERIC;
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}


/**
 * Releases resources
 */
static void Close (vlc_object_t *obj)
{
    demux_t *demux = (demux_t *)obj;
    demux_sys_t *p_sys = demux->p_sys;

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    if (p_sys->thread_ready)
    {
        vlc_cancel (p_sys->thread);
        vlc_join (p_sys->thread, NULL);
    }
    vlc_cond_destroy (&p_sys->wait);
    vlc_mutex_destroy (&p_sys->lock);

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    if (p_sys->srtp)
        srtp_destroy (p_sys->srtp);
    if (p_sys->session)
        rtp_session_destroy (demux, p_sys->session);
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    if (p_sys->rtcp_fd != -1)
        net_Close (p_sys->rtcp_fd);
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    net_Close (p_sys->fd);
    free (p_sys);
}


/**
 * Extracts port number from "[host]:port" or "host:port" strings,
 * and remove brackets from the host name.
 * @param phost pointer to the string upon entry,
 * pointer to the hostname upon return.
 * @return port number, 0 if missing.
 */
static int extract_port (char **phost)
{
    char *host = *phost, *port;

    if (host[0] == '[')
    {
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        host = ++*phost; /* skip '[' */
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        port = strchr (host, ']');
        if (port)
            *port++ = '\0'; /* skip ']' */
    }
    else
        port = strchr (host, ':');

    if (port == NULL)
        return 0;
    *port++ = '\0'; /* skip ':' */
    return atoi (port);
}


/**
 * Control callback
 */
static int Control (demux_t *demux, int i_query, va_list args)
{
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    demux_sys_t *p_sys = demux->p_sys;
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    switch (i_query)
    {
        case DEMUX_GET_POSITION:
        {
            float *v = va_arg (args, float *);
            *v = 0.;
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            return VLC_SUCCESS;
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        }

        case DEMUX_GET_LENGTH:
        case DEMUX_GET_TIME:
        {
            int64_t *v = va_arg (args, int64_t *);
            *v = 0;
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            return VLC_SUCCESS;
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        }

        case DEMUX_GET_PTS_DELAY:
        {
            int64_t *v = va_arg (args, int64_t *);
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            *v = p_sys->caching * 1000;
            return VLC_SUCCESS;
        }

        case DEMUX_CAN_PAUSE:
        case DEMUX_CAN_SEEK:
        case DEMUX_CAN_CONTROL_PACE:
        {
            bool *v = (bool*)va_arg( args, bool * );
            *v = false;
            return VLC_SUCCESS;
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        }
    }

    return VLC_EGENERIC;
}


/*
 * Generic packet handlers
 */
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static void *codec_init (demux_t *demux, es_format_t *fmt)
{
    return es_out_Add (demux->out, fmt);
}

static void codec_destroy (demux_t *demux, void *data)
{
    if (data)
        es_out_Del (demux->out, (es_out_id_t *)data);
}

/* Send a packet to decoder */
static void codec_decode (demux_t *demux, void *data, block_t *block)
{
    if (data)
    {
        block->i_dts = 0; /* RTP does not specify this */
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        es_out_Control (demux->out, ES_OUT_SET_PCR, block->i_pts );
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        es_out_Send (demux->out, (es_out_id_t *)data, block);
    }
    else
        block_Release (block);
}


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static void *stream_init (demux_t *demux, const char *name)
{
    return stream_DemuxNew (demux, name, demux->out);
}

static void stream_destroy (demux_t *demux, void *data)
{
    if (data)
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        stream_Delete ((stream_t *)data);
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    (void)demux;
}

/* Send a packet to a chained demuxer */
static void stream_decode (demux_t *demux, void *data, block_t *block)
{
    if (data)
        stream_DemuxSend ((stream_t *)data, block);
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    else
        block_Release (block);
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    (void)demux;
}

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/*
 * Static payload types handler
 */

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/* PT=0
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 * PCMU: G.711 µ-law (RFC3551)
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 */
static void *pcmu_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('u', 'l', 'a', 'w'));
    fmt.audio.i_rate = 8000;
    fmt.audio.i_channels = 1;
    return codec_init (demux, &fmt);
}

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/* PT=3
 * GSM
 */
static void *gsm_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('g', 's', 'm', ' '));
    fmt.audio.i_rate = 8000;
    fmt.audio.i_channels = 1;
    return codec_init (demux, &fmt);
}

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/* PT=8
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 * PCMA: G.711 A-law (RFC3551)
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 */
static void *pcma_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('a', 'l', 'a', 'w'));
    fmt.audio.i_rate = 8000;
    fmt.audio.i_channels = 1;
    return codec_init (demux, &fmt);
}

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/* PT=10,11
 * L16: 16-bits (network byte order) PCM
 */
static void *l16s_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('s', '1', '6', 'b'));
    fmt.audio.i_rate = 44100;
    fmt.audio.i_channels = 2;
    return codec_init (demux, &fmt);
}

static void *l16m_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('s', '1', '6', 'b'));
    fmt.audio.i_rate = 44100;
    fmt.audio.i_channels = 1;
    return codec_init (demux, &fmt);
}

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/* PT=12
 * QCELP
 */
static void *qcelp_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('Q', 'c', 'l', 'p'));
    fmt.audio.i_rate = 8000;
    fmt.audio.i_channels = 1;
    return codec_init (demux, &fmt);
}

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/* PT=14
 * MPA: MPEG Audio (RFC2250, §3.4)
 */
static void *mpa_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, AUDIO_ES, VLC_FOURCC ('m', 'p', 'g', 'a'));
    fmt.audio.i_channels = 2;
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    fmt.b_packetized = false;
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    return codec_init (demux, &fmt);
}

static void mpa_decode (demux_t *demux, void *data, block_t *block)
{
    if (block->i_buffer < 4)
    {
        block_Release (block);
        return;
    }

    block->i_buffer -= 4; /* 32-bits RTP/MPA header */
    block->p_buffer += 4;

    codec_decode (demux, data, block);
}


/* PT=32
 * MPV: MPEG Video (RFC2250, §3.5)
 */
static void *mpv_init (demux_t *demux)
{
    es_format_t fmt;

    es_format_Init (&fmt, VIDEO_ES, VLC_FOURCC ('m', 'p', 'g', 'v'));
    return codec_init (demux, &fmt);
}

static void mpv_decode (demux_t *demux, void *data, block_t *block)
{
    if (block->i_buffer < 4)
    {
        block_Release (block);
        return;
    }

    block->i_buffer -= 4; /* 32-bits RTP/MPV header */
    block->p_buffer += 4;
#if 0
    if (block->p_buffer[-3] & 0x4)
    {
        /* MPEG2 Video extension header */
        /* TODO: shouldn't we skip this too ? */
    }
#endif
    codec_decode (demux, data, block);
}


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/* PT=33
 * MP2: MPEG TS (RFC2250, §2)
 */
static void *ts_init (demux_t *demux)
{
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    return stream_init (demux, *demux->psz_demux ? demux->psz_demux : "ts");
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}


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/* Not using SDP, we need to guess the payload format used */
/* see http://www.iana.org/assignments/rtp-parameters */
int rtp_autodetect (demux_t *demux, rtp_session_t *session,
                    const block_t *block)
{
    uint8_t ptype = rtp_ptype (block);
    rtp_pt_t pt = {
        .init = NULL,
        .destroy = codec_destroy,
        .decode = codec_decode,
        .frequency = 0,
        .number = ptype,
    };

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    /* Remember to keep this in sync with modules/services_discovery/sap.c */
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    switch (ptype)
    {
      case 0:
        msg_Dbg (demux, "detected G.711 mu-law");
        pt.init = pcmu_init;
        pt.frequency = 8000;
        break;

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      case 3:
        msg_Dbg (demux, "detected GSM");
        pt.init = gsm_init;
        pt.frequency = 8000;
        break;

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      case 8:
        msg_Dbg (demux, "detected G.711 A-law");
        pt.init = pcma_init;
        pt.frequency = 8000;
        break;

      case 10:
        msg_Dbg (demux, "detected stereo PCM");
        pt.init = l16s_init;
        pt.frequency = 44100;
        break;

      case 11:
        msg_Dbg (demux, "detected mono PCM");
        pt.init = l16m_init;
        pt.frequency = 44100;
        break;

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      case 12:
        msg_Dbg (demux, "detected QCELP");
        pt.init = qcelp_init;
        pt.frequency = 8000;
        break;

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      case 14:
        msg_Dbg (demux, "detected MPEG Audio");
        pt.init = mpa_init;
        pt.decode = mpa_decode;
        pt.frequency = 90000;
        break;

      case 32:
        msg_Dbg (demux, "detected MPEG Video");
        pt.init = mpv_init;
        pt.decode = mpv_decode;
        pt.frequency = 90000;
        break;

      case 33:
        msg_Dbg (demux, "detected MPEG2 TS");
        pt.init = ts_init;
        pt.destroy = stream_destroy;
        pt.decode = stream_decode;
        pt.frequency = 90000;
        break;

      default:
        return -1;
    }
    rtp_add_type (demux, session, &pt);
    return 0;
}

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/*
 * Dynamic payload type handlers
 * Hmm, none implemented yet.
 */
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/**
 * Processing callback
 */
static int Demux (demux_t *demux)
{
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    return rtp_process (demux) ? 0 : 1;
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}