/**
* Processes a packet received from the RTP socket.
*/
static void rtp_process (demux_t *demux, block_t *block)
{
demux_sys_t *sys = demux->p_sys;
if (block->i_buffer < 2)
goto drop;
const uint8_t ptype = rtp_ptype (block);
if (ptype >= 72 && ptype <= 76)
goto drop; /* Muxed RTCP, ignore for now FIXME */
#ifdef HAVE_SRTP
if (sys->srtp != NULL)
{
size_t len = block->i_buffer;
if (srtp_recv (sys->srtp, block->p_buffer, &len))
{
msg_Dbg (demux, "SRTP authentication/decryption failed");
goto drop;
}
block->i_buffer = len;
}
#endif
/* TODO: use SDP and get rid of this hack */
if (unlikely(sys->autodetect))
{ /* Autodetect payload type, _before_ rtp_queue() */
rtp_autodetect (demux, sys->session, block);
sys->autodetect = false;
}
rtp_queue (demux, sys->session, block);
return;
drop:
block_Release (block);
}
static block_t *rtp_recv (demux_t *demux)
{
demux_sys_t *p_sys = demux->p_sys;
for (block_t *block;; block_Release (block))
{
block = p_sys->framed_rtp
? rtp_stream_recv (VLC_OBJECT (demux), p_sys->fd)
: rtp_dgram_recv (VLC_OBJECT (demux), p_sys->fd);
if (block == NULL)
{
msg_Err (demux, "RTP flow stopped");
break; /* fatal error */
}
if (block->i_buffer < 2)
continue;
/* FIXME */
const uint8_t ptype = rtp_ptype (block);
if (ptype >= 72 && ptype <= 76)
continue; /* Muxed RTCP, ignore for now */
#ifdef HAVE_SRTP
if (p_sys->srtp)
{
size_t len = block->i_buffer;
int canc, err;
canc = vlc_savecancel ();
err = srtp_recv (p_sys->srtp, block->p_buffer, &len);
vlc_restorecancel (canc);
if (err)
{
msg_Dbg (demux, "SRTP authentication/decryption failed");
continue;
}
block->i_buffer = len;
}
#endif
return block; /* success! */
}
return NULL;
}
/* see http://www.iana.org/assignments/rtp-parameters */
void 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,
};
/* Remember to keep this in sync with modules/services_discovery/sap.c */
switch (ptype)
{
case 0:
msg_Dbg (demux, "detected G.711 mu-law");
pt.init = pcmu_init;
pt.frequency = 8000;
break;
case 3:
msg_Dbg (demux, "detected GSM");
pt.init = gsm_init;
pt.frequency = 8000;
break;
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;
case 12:
msg_Dbg (demux, "detected QCELP");
pt.init = qcelp_init;
pt.frequency = 8000;
break;
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:
/*
* If the rtp payload type is unknown then check demux if it is specified
*/
if (!strcmp(demux->psz_demux, "h264")
|| !strcmp(demux->psz_demux, "ts"))
{
msg_Dbg (demux, "dynamic payload format %s specified by demux",
demux->psz_demux);
pt.init = demux_init;
pt.destroy = stream_destroy;
pt.decode = stream_decode;
pt.frequency = 90000;
break;
}
if (ptype >= 96)
{
char *dynamic = var_InheritString(demux, "rtp-dynamic-pt");
if (dynamic == NULL)
;
else if (!strcmp(dynamic, "theora"))
{
msg_Dbg (demux, "assuming Theora Encoded Video");
pt.init = theora_init;
pt.destroy = xiph_destroy;
pt.decode = xiph_decode;
pt.frequency = 90000;
}
else
msg_Err (demux, "unknown dynamic payload format `%s' "
"specified", dynamic);
free (dynamic);
}
msg_Err (demux, "unspecified payload format (type %"PRIu8")", ptype);
msg_Info (demux, "A valid SDP is needed to parse this RTP stream.");
vlc_dialog_display_error (demux, N_("SDP required"),
N_("A description in SDP format is required to receive the RTP "
"stream. Note that rtp:// URIs cannot work with dynamic "
"RTP payload format (%"PRIu8")."), ptype);
return;
}
rtp_add_type (demux, session, &pt);
}
/* 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,
};
/* Remember to keep this in sync with modules/services_discovery/sap.c */
switch (ptype)
{
case 0:
msg_Dbg (demux, "detected G.711 mu-law");
pt.init = pcmu_init;
pt.frequency = 8000;
break;
case 3:
msg_Dbg (demux, "detected GSM");
pt.init = gsm_init;
pt.frequency = 8000;
break;
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;
case 12:
msg_Dbg (demux, "detected QCELP");
pt.init = qcelp_init;
pt.frequency = 8000;
break;
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;
}
