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TT#92250 postpone codec_tracker to final stage

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Change-Id: I222f705e53fc95f56da40cf927197afcb2ee5107
pull/1093/head
Richard Fuchs 5 years ago
parent dbd817a2a6
commit 68ccc52b2b
6 changed files with 112 additions and 73 deletions
Show Stats Download Patch File Download Diff File

3
daemon/call.c
Unescape View File

@ -2116,8 +2116,11 @@ int monologue_offer_answer(struct call_monologue *other_ml, GQueue *streams,
if (media->protocol == other_media->protocol)
call_str_cpy(call, &media->format_str, &sp->format_str);
}
codec_tracker_init(media);
codec_rtp_payload_types(media, other_media, &sp->rtp_payload_types, flags);
codec_handlers_update(media, other_media, flags, sp);
codec_tracker_finish(media);
/* send and recv are from our POV */
bf_copy_same(&media->media_flags, &sp->sp_flags,

159
daemon/codec.c
Unescape View File

@ -100,7 +100,7 @@ struct transcode_packet {
int (*dup_func)(struct codec_ssrc_handler *, struct transcode_packet *, struct media_packet *);
struct rtp_header rtp;
};
struct supp_codec_tracker {
struct codec_tracker {
GHashTable *clockrates; // 8000, 16000, etc, for each real audio codec that is present
GHashTable *touched; // 8000, 16000, etc, for each audio codec that was touched (added, removed, etc)
int all_touched;
@ -125,6 +125,8 @@ static int packet_encoded_rtp(encoder_t *enc, void *u1, void *u2);
static int packet_decoded_fifo(decoder_t *decoder, AVFrame *frame, void *u1, void *u2);
static int packet_decoded_direct(decoder_t *decoder, AVFrame *frame, void *u1, void *u2);
static void codec_touched(struct rtp_payload_type *pt, struct call_media *media);
static struct codec_handler codec_handler_stub_ssrc = {
.source_pt.payload_type = -1,
@ -501,6 +503,7 @@ static void __single_codec(struct call_media *media, const struct sdp_ng_flags *
}
ilog(LOG_DEBUG, "Removing codec '" STR_FORMAT "' due to 'single codec' flag",
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, media);
l = __delete_receiver_codec(media, l);
}
}
@ -565,6 +568,8 @@ static void __accept_transcode_codecs(struct call_media *receiver, struct call_m
// we need a new pt entry
pt = __rtp_payload_type_copy(pt);
pt->for_transcoding = 1;
codec_touched(pt, receiver);
// this somewhat duplicates __rtp_payload_type_add_recv
g_hash_table_insert(receiver->codecs_recv, &pt->payload_type, pt);
__rtp_payload_type_add_name(receiver->codec_names_recv, pt);
@ -597,6 +602,7 @@ static void __eliminate_rejected_codecs(struct call_media *receiver, struct call
}
ilog(LOG_DEBUG, "Eliminating asymmetric outbound codec " STR_FORMAT,
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, receiver);
l = __delete_send_codec(receiver, l);
}
}
@ -657,7 +663,7 @@ static void __symmetric_codecs(struct call_media *receiver, struct call_media *s
// add it to the list
ilog(LOG_DEBUG, "Adding symmetric RTP payload type %i", pt->payload_type);
g_hash_table_steal(prefs_recv, GINT_TO_POINTER(pt->payload_type));
__rtp_payload_type_add_recv(receiver, out_pt, 1, NULL);
__rtp_payload_type_add_recv(receiver, out_pt, 1);
// and our send leg
out_pt = g_hash_table_lookup(prefs_send, GINT_TO_POINTER(pt->payload_type));
if (out_pt) {
@ -682,7 +688,7 @@ static void __symmetric_codecs(struct call_media *receiver, struct call_media *s
if (!out_pt)
continue;
g_hash_table_steal(prefs_recv, ptype);
__rtp_payload_type_add_recv(receiver, out_pt, 1, NULL);
__rtp_payload_type_add_recv(receiver, out_pt, 1);
}
while (prefs_send_order.length) {
void *ptype = g_queue_pop_head(&prefs_send_order);
@ -1009,6 +1015,7 @@ void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
ilog(LOG_DEBUG, "Eliminating transcoded codec " STR_FORMAT,
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, receiver);
l = __delete_receiver_codec(receiver, l);
continue;
}
@ -1130,6 +1137,7 @@ next:
ilog(LOG_DEBUG, "Stripping unsupported codec " STR_FORMAT " due to active transcoding",
STR_FMT(&pt->encoding));
codec_touched(pt, receiver);
l = __delete_receiver_codec(receiver, l);
}
@ -2219,21 +2227,41 @@ static void __rtp_payload_type_add_name(GHashTable *ht, struct rtp_payload_type
q = g_hash_table_lookup_queue_new(ht, &pt->encoding_with_params);
g_queue_push_tail(q, GUINT_TO_POINTER(pt->payload_type));
}
static void __insert_codec_tracker(struct call_media *media, GList *link) {
struct rtp_payload_type *pt = link->data;
struct codec_tracker *sct = media->codec_tracker;
ensure_codec_def(pt, media);
if (!pt->codec_def || !pt->codec_def->supplemental)
g_hash_table_replace(sct->clockrates, GUINT_TO_POINTER(pt->clock_rate),
GUINT_TO_POINTER(GPOINTER_TO_UINT(
g_hash_table_lookup(sct->clockrates,
GUINT_TO_POINTER(pt->clock_rate))) + 1));
else {
GHashTable *clockrates = g_hash_table_lookup(sct->supp_codecs, &pt->encoding);
if (!clockrates) {
clockrates = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL,
(GDestroyNotify) g_queue_free);
g_hash_table_replace(sct->supp_codecs, str_dup(&pt->encoding), clockrates);
}
GQueue *entries = g_hash_table_lookup_queue_new(clockrates, GUINT_TO_POINTER(pt->clock_rate));
g_queue_push_tail(entries, link);
}
}
static void __queue_insert_supp(GQueue *q, struct rtp_payload_type *pt, int supp_check,
struct supp_codec_tracker *sct)
struct codec_tracker *sct)
{
int is_supp = pt->codec_def && pt->codec_def->supplemental;
// do we care at all?
if (!supp_check) {
g_queue_push_tail(q, pt);
goto do_sct;
return;
}
// all new supp codecs go last
if (is_supp) {
if (pt->codec_def && pt->codec_def->supplemental) {
g_queue_push_tail(q, pt);
goto do_sct;
return;
}
// find the cut-off point between non-supp and supp codecs
@ -2250,28 +2278,9 @@ static void __queue_insert_supp(GQueue *q, struct rtp_payload_type *pt, int supp
g_queue_push_head(q, pt);
else
g_queue_insert_after(q, insert_pos, pt);
do_sct:
if (!sct)
return;
if (!is_supp)
g_hash_table_replace(sct->clockrates, GUINT_TO_POINTER(pt->clock_rate), (void *) 0x1);
else {
GHashTable *clockrates = g_hash_table_lookup(sct->supp_codecs, &pt->encoding);
if (!clockrates) {
clockrates = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL,
(GDestroyNotify) g_queue_free);
g_hash_table_replace(sct->supp_codecs, &pt->encoding, clockrates);
}
GQueue *entries = g_hash_table_lookup_queue_new(clockrates, GUINT_TO_POINTER(pt->clock_rate));
// new supp entries are always last
g_queue_push_tail(entries, q->tail);
}
}
// consumes 'pt'
void __rtp_payload_type_add_recv(struct call_media *media,
struct rtp_payload_type *pt, int supp_check, struct supp_codec_tracker *sct)
{
void __rtp_payload_type_add_recv(struct call_media *media, struct rtp_payload_type *pt, int supp_check) {
if (!pt)
return;
ensure_codec_def(pt, media);
@ -2284,7 +2293,7 @@ void __rtp_payload_type_add_recv(struct call_media *media,
pt->ptime = media->ptime;
g_hash_table_insert(media->codecs_recv, &pt->payload_type, pt);
__rtp_payload_type_add_name(media->codec_names_recv, pt);
__queue_insert_supp(&media->codecs_prefs_recv, pt, supp_check, sct);
__queue_insert_supp(&media->codecs_prefs_recv, pt, supp_check, media->codec_tracker);
}
// consumes 'pt'
void __rtp_payload_type_add_send(struct call_media *other_media,
@ -2314,10 +2323,10 @@ void __rtp_payload_type_add_send_dup(struct call_media *other_media,
}
// consumes 'pt'
static void __rtp_payload_type_add(struct call_media *media, struct call_media *other_media,
struct rtp_payload_type *pt, struct supp_codec_tracker *sct)
struct rtp_payload_type *pt)
{
__rtp_payload_type_add_send_dup(other_media, pt);
__rtp_payload_type_add_recv(media, pt, 0, sct);
__rtp_payload_type_add_recv(media, pt, 0);
}
static void __payload_queue_free(void *qq) {
@ -2325,7 +2334,7 @@ static void __payload_queue_free(void *qq) {
g_queue_free_full(q, (GDestroyNotify) payload_type_free);
}
static int __revert_codec_strip(GHashTable *stripped, GHashTable *masked, const str *codec,
struct call_media *media, struct call_media *other_media, struct supp_codec_tracker *sct)
struct call_media *media, struct call_media *other_media)
{
int ret = 0;
@ -2336,7 +2345,7 @@ static int __revert_codec_strip(GHashTable *stripped, GHashTable *masked, const
g_hash_table_steal(stripped, codec);
for (GList *l = q->head; l; l = l->next) {
struct rtp_payload_type *pt = l->data;
__rtp_payload_type_add(media, other_media, pt, sct);
__rtp_payload_type_add(media, other_media, pt);
}
g_queue_free(q);
ret = 1;
@ -2350,7 +2359,7 @@ static int __revert_codec_strip(GHashTable *stripped, GHashTable *masked, const
for (GList *l = q->head; l; l = l->next) {
struct rtp_payload_type *pt = l->data;
pt->for_transcoding = 1;
__rtp_payload_type_add_recv(media, pt, 1, sct);
__rtp_payload_type_add_recv(media, pt, 1);
}
g_queue_free(q);
ret = 1;
@ -2388,25 +2397,32 @@ static void __codec_options_set(struct call *call, struct rtp_payload_type *pt,
if (__codec_options_set1(call, pt, &pt->encoding, codec_set))
return;
}
static void supp_codec_tracker_init(struct supp_codec_tracker *sct) {
ZERO(*sct);
sct->clockrates = g_hash_table_new(g_direct_hash, g_direct_equal);
sct->touched = g_hash_table_new(g_direct_hash, g_direct_equal);
sct->supp_codecs = g_hash_table_new_full(str_case_hash, str_case_equal, NULL,
static void codec_tracker_destroy(struct codec_tracker **sct) {
if (!*sct)
return;
g_hash_table_destroy((*sct)->clockrates);
g_hash_table_destroy((*sct)->touched);
g_hash_table_destroy((*sct)->supp_codecs);
g_slice_free1(sizeof(*sct), *sct);
*sct = NULL;
}
void codec_tracker_init(struct call_media *m) {
codec_tracker_destroy(&m->codec_tracker);
m->codec_tracker = g_slice_alloc0(sizeof(*m->codec_tracker));
m->codec_tracker->clockrates = g_hash_table_new(g_direct_hash, g_direct_equal);
m->codec_tracker->touched = g_hash_table_new(g_direct_hash, g_direct_equal);
m->codec_tracker->supp_codecs = g_hash_table_new_full(str_case_hash, str_case_equal, free,
(GDestroyNotify) g_hash_table_destroy);
}
static void supp_codec_tracker_destroy(struct supp_codec_tracker *sct) {
g_hash_table_destroy(sct->clockrates);
g_hash_table_destroy(sct->touched);
g_hash_table_destroy(sct->supp_codecs);
}
static void codec_touched(struct rtp_payload_type *pt, struct supp_codec_tracker *sct, struct call_media *media) {
static void codec_touched(struct rtp_payload_type *pt, struct call_media *media) {
if (!media->codec_tracker)
return;
ensure_codec_def(pt, media);
if (pt->codec_def && pt->codec_def->supplemental) {
sct->all_touched = 1;
media->codec_tracker->all_touched = 1;
return;
}
g_hash_table_replace(sct->touched, GUINT_TO_POINTER(pt->clock_rate), (void *) 0x1);
g_hash_table_replace(media->codec_tracker->touched, GUINT_TO_POINTER(pt->clock_rate), (void *) 0x1);
}
static int ptr_cmp(const void *a, const void *b) {
if (a < b)
@ -2415,8 +2431,16 @@ static int ptr_cmp(const void *a, const void *b) {
return 1;
return 0;
}
static void supp_codecs_fixup(struct supp_codec_tracker *sct, struct call_media *media) {
// get all supported audio cloc krates
void codec_tracker_finish(struct call_media *media) {
struct codec_tracker *sct = media->codec_tracker;
if (!sct)
return;
// build our tables
for (GList *l = media->codecs_prefs_recv.head; l; l = l->next)
__insert_codec_tracker(media, l);
// get all supported audio clock rates
GList *clockrates = g_hash_table_get_keys(sct->clockrates);
// and to ensure consistent results
clockrates = g_list_sort(clockrates, ptr_cmp);
@ -2433,6 +2457,10 @@ static void supp_codecs_fixup(struct supp_codec_tracker *sct, struct call_media
for (GList *k = clockrates; k; k = k->next) {
unsigned int clockrate = GPOINTER_TO_UINT(k->data);
// has it been removed?
if (!g_hash_table_lookup(sct->clockrates, GUINT_TO_POINTER(clockrate)))
continue;
// is this already supported?
if (g_hash_table_lookup(supp_clockrates, GUINT_TO_POINTER(clockrate))) {
// good, remember this
@ -2455,7 +2483,7 @@ static void supp_codecs_fixup(struct supp_codec_tracker *sct, struct call_media
continue;
pt->for_transcoding = 1;
__rtp_payload_type_add_recv(media, pt, 1, NULL);
__rtp_payload_type_add_recv(media, pt, 1);
g_free(pt_s);
}
@ -2484,6 +2512,7 @@ static void supp_codecs_fixup(struct supp_codec_tracker *sct, struct call_media
g_list_free(supp_codecs);
g_list_free(clockrates);
codec_tracker_destroy(&media->codec_tracker);
}
int __codec_ht_except(int all_flag, GHashTable *yes_ht, GHashTable *no_ht, struct rtp_payload_type *pt) {
int do_this = 0;
@ -2546,9 +2575,6 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
else if (flags->codec_mask && g_hash_table_lookup(flags->codec_mask, &str_full))
mask_all = 2;
struct supp_codec_tracker sct;
supp_codec_tracker_init(&sct);
/* we steal the entire list to avoid duplicate allocs */
while ((pt = g_queue_pop_head(types))) {
__rtp_payload_type_dup(call, pt); // this takes care of string allocation
@ -2557,7 +2583,7 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
if (__codec_ht_except(strip_all, flags->codec_strip, flags->codec_except, pt)) {
ilog(LOG_DEBUG, "Stripping codec '" STR_FORMAT "'",
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, &sct, media);
codec_touched(pt, media);
GQueue *q = g_hash_table_lookup_queue_new(stripped, &pt->encoding);
g_queue_push_tail(q, __rtp_payload_type_copy(pt));
q = g_hash_table_lookup_queue_new(stripped, &pt->encoding_with_params);
@ -2571,7 +2597,7 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
if (__codec_ht_except(mask_all, flags->codec_mask, flags->codec_except, pt)) {
ilog(LOG_DEBUG, "Masking codec '" STR_FORMAT "'",
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, &sct, other_media);
codec_touched(pt, media);
GQueue *q = g_hash_table_lookup_queue_new(masked, &pt->encoding);
g_queue_push_tail(q, __rtp_payload_type_copy(pt));
q = g_hash_table_lookup_queue_new(stripped, &pt->encoding_with_params);
@ -2579,13 +2605,13 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
__rtp_payload_type_add_send(other_media, pt);
}
else
__rtp_payload_type_add(media, other_media, pt, &sct);
__rtp_payload_type_add(media, other_media, pt);
}
// now restore codecs that have been removed, but should be offered
for (GList *l = flags->codec_offer.head; l; l = l->next) {
str *codec = l->data;
__revert_codec_strip(stripped, masked, codec, media, other_media, &sct);
__revert_codec_strip(stripped, masked, codec, media, other_media);
}
if (!flags->asymmetric_codecs) {
@ -2599,6 +2625,7 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
}
ilog(LOG_DEBUG, "Eliminating asymmetric inbound codec " STR_FORMAT,
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, other_media);
l = __delete_receiver_codec(other_media, l);
}
}
@ -2614,7 +2641,7 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
// simply restore it from the original list and handle it the same way
// as 'offer'
if ((strip_all == 1 || mask_all == 1)
&& __revert_codec_strip(stripped, masked, codec, media, other_media, &sct))
&& __revert_codec_strip(stripped, masked, codec, media, other_media))
continue;
// also check if maybe the codec was never stripped
if (g_hash_table_lookup(media->codec_names_recv, codec)) {
@ -2628,11 +2655,11 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
if (!pt)
continue;
pt->for_transcoding = 1;
codec_touched(pt, &sct, media);
codec_touched(pt, media);
ilog(LOG_DEBUG, "Codec '" STR_FORMAT "' added for transcoding with payload type %u",
STR_FMT(&pt->encoding_with_params), pt->payload_type);
__rtp_payload_type_add_recv(media, pt, 1, &sct);
__rtp_payload_type_add_recv(media, pt, 1);
}
if (media->type_id == MT_AUDIO && other_media->type_id == MT_IMAGE) {
@ -2648,7 +2675,7 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
if (media->t38_gateway && media->t38_gateway->pcm_player
&& media->t38_gateway->pcm_player->handler)
__rtp_payload_type_add_recv(media,
__rtp_payload_type_copy(&media->t38_gateway->pcm_player->handler->dest_pt), 1, &sct);
__rtp_payload_type_copy(&media->t38_gateway->pcm_player->handler->dest_pt), 1);
}
else if (flags->opmode == OP_OFFER) {
// T.38 -> audio transcoder, initial offer, and no codecs have been given.
@ -2658,10 +2685,10 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
static const str PCMA_str = STR_CONST_INIT("PCMA");
pt = codec_add_payload_type(&PCMU_str, media);
assert(pt != NULL);
__rtp_payload_type_add_recv(media, pt, 1, &sct);
__rtp_payload_type_add_recv(media, pt, 1);
pt = codec_add_payload_type(&PCMA_str, media);
assert(pt != NULL);
__rtp_payload_type_add_recv(media, pt, 1, &sct);
__rtp_payload_type_add_recv(media, pt, 1);
ilog(LOG_DEBUG, "Using default codecs PCMU and PCMA for T.38 gateway");
}
@ -2680,15 +2707,13 @@ void codec_rtp_payload_types(struct call_media *media, struct call_media *other_
}
ilog(LOG_DEBUG, "Eliminating unsupported codec " STR_FORMAT,
STR_FMT(&pt->encoding_with_params));
codec_touched(pt, media);
l = __delete_receiver_codec(media, l);
}
}
}
#endif
supp_codecs_fixup(&sct, media);
g_hash_table_destroy(stripped);
g_hash_table_destroy(masked);
supp_codec_tracker_destroy(&sct);
}

2
daemon/redis.c
Unescape View File

@ -1427,7 +1427,7 @@ static struct rtp_payload_type *rbl_cb_plts_g(str *s, GQueue *q, struct redis_li
}
static int rbl_cb_plts_r(str *s, GQueue *q, struct redis_list *list, void *ptr) {
struct call_media *med = ptr;
__rtp_payload_type_add_recv(med, rbl_cb_plts_g(s, q, list, ptr), 0, NULL);
__rtp_payload_type_add_recv(med, rbl_cb_plts_g(s, q, list, ptr), 0);
return 0;
}
static int rbl_cb_plts_s(str *s, GQueue *q, struct redis_list *list, void *ptr) {

2
include/call.h
Unescape View File

@ -196,6 +196,7 @@ struct media_player;
struct send_timer;
struct transport_protocol;
struct jitter_buffer;
struct codec_tracker;
typedef bencode_buffer_t call_buffer_t;
@ -325,6 +326,7 @@ struct call_media {
GHashTable *codecs_send; // int payload type -> struct rtp_payload_type
GHashTable *codec_names_send; // codec name -> GQueue of int payload types; storage container
GQueue codecs_prefs_send; // storage container
struct codec_tracker *codec_tracker;
GQueue sdp_attributes; // str_sprintf()

7
include/codec.h
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@ -79,8 +79,7 @@ void codec_init_payload_type(struct rtp_payload_type *, struct call_media *);
// used by redis
void __rtp_payload_type_add_recv(struct call_media *media, struct rtp_payload_type *pt, int supp_check,
struct supp_codec_tracker *sct);
void __rtp_payload_type_add_recv(struct call_media *media, struct rtp_payload_type *pt, int supp_check);
void __rtp_payload_type_add_send(struct call_media *other_media, struct rtp_payload_type *pt);
@ -95,12 +94,16 @@ uint64_t codec_last_dtmf_event(struct codec_ssrc_handler *ch);
uint64_t codec_encoder_pts(struct codec_ssrc_handler *ch);
void codec_decoder_skip_pts(struct codec_ssrc_handler *ch, uint64_t);
uint64_t codec_decoder_unskip_pts(struct codec_ssrc_handler *ch);
void codec_tracker_init(struct call_media *);
void codec_tracker_finish(struct call_media *);
#else
INLINE void codec_handlers_update(struct call_media *receiver, struct call_media *sink,
const struct sdp_ng_flags *flags, const struct stream_params *sp) { }
INLINE void codec_handler_free(struct codec_handler **handler) { }
INLINE void codec_tracker_init(struct call_media *m) { }
INLINE void codec_tracker_finish(struct call_media *m) { }
#endif

12
t/auto-daemon-tests.pl
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@ -4081,14 +4081,16 @@ s=pjmedia
b=AS:117
t=0 0
a=X-nat:0
m=audio PORT RTP/AVP 8 107 101
m=audio PORT RTP/AVP 8 107 101 96
c=IN IP4 203.0.113.1
b=TIAS:96000
a=ssrc:243811319 cname:04389d431bdd5c52
a=rtpmap:8 PCMA/8000
a=rtpmap:107 opus/48000/2
a=rtpmap:101 telephone-event/8000
a=rtpmap:96 telephone-event/48000
a=fmtp:101 0-16
a=fmtp:96 0-15
a=sendrecv
a=rtcp:PORT
a=ptime:20
@ -4151,14 +4153,16 @@ s=pjmedia
b=AS:117
t=0 0
a=X-nat:0
m=audio PORT RTP/AVP 8 107 101
m=audio PORT RTP/AVP 8 107 101 96
c=IN IP4 203.0.113.1
b=TIAS:96000
a=ssrc:243811319 cname:04389d431bdd5c52
a=rtpmap:8 PCMA/8000
a=rtpmap:107 opus/48000/2
a=rtpmap:101 telephone-event/8000
a=rtpmap:96 telephone-event/48000
a=fmtp:101 0-16
a=fmtp:96 0-15
a=sendrecv
a=rtcp:PORT
a=ptime:20
@ -6946,13 +6950,15 @@ o=- 1545997027 1 IN IP4 203.0.113.1
s=tester
c=IN IP4 203.0.113.1
t=0 0
m=audio PORT RTP/AVP 120 8 0 101
m=audio PORT RTP/AVP 120 8 0 101 96
a=rtpmap:120 opus/48000/2
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=rtpmap:96 telephone-event/48000
a=fmtp:120 useinbandfec=1; usedtx=1; maxaveragebitrate=64000
a=fmtp:101 0-15
a=fmtp:96 0-15
a=sendrecv
a=rtcp:PORT
SDP

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