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switch_jitterbuffer.c
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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
*
* The Initial Developer of the Original Code is
* Anthony Minessale II <anthm@freeswitch.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Anthony Minessale II <anthm@freeswitch.org>
* Dragos Oancea <dragos@freeswitch.org>
*
* switch_jitterbuffer.c -- Audio/Video Jitter Buffer
*
*/
#include <switch.h>
#include <switch_jitterbuffer.h>
#include "private/switch_hashtable_private.h"
#define NACK_TIME 80000
#define RENACK_TIME 100000
#define MAX_FRAME_PADDING 2
#define MAX_MISSING_SEQ 20
#define jb_debug(_jb, _level, _format, ...) if (_jb->debug_level >= _level) switch_log_printf(SWITCH_CHANNEL_SESSION_LOG_CLEAN(_jb->session), SWITCH_LOG_ALERT, "JB:%p:%s:%d/%d lv:%d ln:%.4d sz:%.3u/%.3u/%.3u/%.3u c:%.3u %.3u/%.3u/%.3u/%.3u %.2f%% ->" _format, (void *) _jb, (jb->type == SJB_TEXT ? "txt" : (jb->type == SJB_AUDIO ? "aud" : "vid")), _jb->allocated_nodes, _jb->visible_nodes, _level, __LINE__, _jb->min_frame_len, _jb->max_frame_len, _jb->frame_len, _jb->complete_frames, _jb->period_count, _jb->consec_good_count, _jb->period_good_count, _jb->consec_miss_count, _jb->period_miss_count, _jb->period_miss_pct, __VA_ARGS__)
//const char *TOKEN_1 = "ONE";
//const char *TOKEN_2 = "TWO";
struct switch_jb_s;
static inline int check_jb_size(switch_jb_t *jb);
typedef struct switch_jb_node_s {
struct switch_jb_s *parent;
switch_rtp_packet_t packet;
uint32_t len;
uint8_t visible;
uint8_t bad_hits;
struct switch_jb_node_s *prev;
struct switch_jb_node_s *next;
/* used for counting the number of partial or complete frames currently in the JB */
switch_bool_t complete_frame_mark;
} switch_jb_node_t;
typedef struct switch_jb_stats_s {
uint32_t reset_too_big;
uint32_t reset_missing_frames;
uint32_t reset_ts_jump;
uint32_t reset_error;
uint32_t reset;
uint32_t size_max;
uint32_t size_est;
uint32_t acceleration;
uint32_t expand;
uint32_t jitter_max_ms;
int estimate_ms;
int buffer_size_ms;
} switch_jb_stats_t;
typedef struct switch_jb_jitter_s {
double *estimate;
uint32_t samples_per_second;
uint32_t samples_per_frame;
uint32_t drop_gap;
switch_jb_stats_t stats;
} switch_jb_jitter_t;
struct switch_jb_s {
struct switch_jb_node_s *node_list;
uint32_t last_target_seq;
uint32_t highest_read_ts;
uint32_t highest_dropped_ts;
uint32_t highest_read_seq;
uint32_t highest_wrote_ts;
uint16_t highest_wrote_seq;
uint16_t target_seq;
uint32_t target_ts;
uint32_t last_target_ts;
uint16_t psuedo_seq;
uint16_t last_psuedo_seq;
uint32_t visible_nodes;
uint32_t allocated_nodes;
uint32_t complete_frames;
uint32_t frame_len;
uint32_t min_frame_len;
uint32_t max_frame_len;
uint32_t highest_frame_len;
uint32_t period_miss_count;
uint32_t consec_miss_count;
uint32_t period_miss_inc;
double period_miss_pct;
uint32_t period_good_count;
uint32_t consec_good_count;
uint32_t period_count;
uint32_t dropped;
uint32_t samples_per_frame;
uint32_t samples_per_second;
uint32_t bitrate_control;
uint32_t video_low_bitrate;
uint8_t write_init;
uint8_t read_init;
uint8_t debug_level;
uint16_t next_seq;
switch_size_t last_len;
switch_inthash_t *missing_seq_hash;
switch_inthash_t *node_hash;
switch_inthash_t *node_hash_ts;
switch_mutex_t *mutex;
switch_mutex_t *list_mutex;
switch_memory_pool_t *pool;
int free_pool;
int drop_flag;
switch_jb_flag_t flags;
switch_jb_type_t type;
switch_core_session_t *session;
switch_jb_jitter_t jitter;
switch_channel_t *channel;
uint32_t buffer_lag;
uint32_t flush;
uint32_t packet_count;
uint32_t max_packet_len;
uint32_t period_len;
uint32_t nack_saved_the_day;
uint32_t nack_didnt_save_the_day;
switch_bool_t elastic;
switch_codec_t *codec;
};
static int node_cmp(const void *l, const void *r)
{
switch_jb_node_t *a = (switch_jb_node_t *) l;
switch_jb_node_t *b = (switch_jb_node_t *) r;
if (!a->visible) return 0;
if (!b->visible) return 1;
return ntohs(a->packet.header.seq) - ntohs(b->packet.header.seq);
}
//http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.c
switch_jb_node_t *sort_nodes(switch_jb_node_t *list, int (*cmp)(const void *, const void *)) {
switch_jb_node_t *p, *q, *e, *tail;
int insize, nmerges, psize, qsize, i;
if (!list) {
return NULL;
}
insize = 1;
while (1) {
p = list;
list = NULL;
tail = NULL;
nmerges = 0; /* count number of merges we do in this pass */
while (p) {
nmerges++; /* there exists a merge to be done */
/* step `insize' places along from p */
q = p;
psize = 0;
for (i = 0; i < insize; i++) {
psize++;
q = q->next;
if (!q) break;
}
/* if q hasn't fallen off end, we have two lists to merge */
qsize = insize;
/* now we have two lists; merge them */
while (psize > 0 || (qsize > 0 && q)) {
/* decide whether next switch_jb_node_t of merge comes from p or q */
if (psize == 0) {
/* p is empty; e must come from q. */
e = q; q = q->next; qsize--;
} else if (qsize == 0 || !q) {
/* q is empty; e must come from p. */
e = p; p = p->next; psize--;
} else if (cmp(p,q) <= 0) {
/* First switch_jb_node_t of p is lower (or same);
* e must come from p. */
e = p; p = p->next; psize--;
} else {
/* First switch_jb_node_t of q is lower; e must come from q. */
e = q; q = q->next; qsize--;
}
/* add the next switch_jb_node_t to the merged list */
if (tail) {
tail->next = e;
} else {
list = e;
}
/* Maintain reverse pointers in a doubly linked list. */
e->prev = tail;
tail = e;
}
/* now p has stepped `insize' places along, and q has too */
p = q;
}
tail->next = NULL;
/* If we have done only one merge, we're finished. */
if (nmerges <= 1) /* allow for nmerges==0, the empty list case */
return list;
/* Otherwise repeat, merging lists twice the size */
insize *= 2;
}
}
// static inline void thin_frames(switch_jb_t *jb, int freq, int max);
static inline switch_jb_node_t *new_node(switch_jb_t *jb)
{
switch_jb_node_t *np;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) {
break;
}
}
if (!np) {
int mult = 2;
if (jb->type != SJB_VIDEO) {
mult = 2;
} else {
if (jb->max_packet_len > mult) {
mult = jb->max_packet_len;
}
}
if (jb->allocated_nodes > jb->max_frame_len * mult) {
jb_debug(jb, 2, "ALLOCATED FRAMES TOO HIGH! %d\n", jb->allocated_nodes);
jb->jitter.stats.reset_too_big++;
switch_jb_reset(jb);
switch_mutex_unlock(jb->list_mutex);
return NULL;
}
np = switch_core_alloc(jb->pool, sizeof(*np));
jb->allocated_nodes++;
np->next = jb->node_list;
if (np->next) {
np->next->prev = np;
}
jb->node_list = np;
}
switch_assert(np);
np->bad_hits = 0;
np->visible = 1;
jb->visible_nodes++;
np->parent = jb;
switch_mutex_unlock(jb->list_mutex);
return np;
}
static inline void push_to_top(switch_jb_t *jb, switch_jb_node_t *node)
{
if (node == jb->node_list) {
jb->node_list = node->next;
} else if (node->prev) {
node->prev->next = node->next;
}
if (node->next) {
node->next->prev = node->prev;
}
node->next = jb->node_list;
node->prev = NULL;
if (node->next) {
node->next->prev = node;
}
jb->node_list = node;
switch_assert(node->next != node);
switch_assert(node->prev != node);
}
static inline void hide_node(switch_jb_node_t *node, switch_bool_t pop)
{
switch_jb_t *jb = node->parent;
switch_mutex_lock(jb->list_mutex);
if (node->visible) {
node->visible = 0;
node->bad_hits = 0;
jb->visible_nodes--;
if (pop) {
push_to_top(jb, node);
}
}
if (jb->node_hash_ts) {
switch_core_inthash_delete(jb->node_hash_ts, node->packet.header.ts);
}
if (switch_core_inthash_delete(jb->node_hash, node->packet.header.seq)) {
if (node->complete_frame_mark && jb->type == SJB_VIDEO) {
jb->complete_frames--;
node->complete_frame_mark = FALSE;
}
}
switch_mutex_unlock(jb->list_mutex);
}
static inline void sort_free_nodes(switch_jb_t *jb)
{
switch_mutex_lock(jb->list_mutex);
jb->node_list = sort_nodes(jb->node_list, node_cmp);
switch_mutex_unlock(jb->list_mutex);
}
static inline void hide_nodes(switch_jb_t *jb)
{
switch_jb_node_t *np;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
hide_node(np, SWITCH_FALSE);
}
switch_mutex_unlock(jb->list_mutex);
}
static inline switch_bool_t packet_vad(switch_jb_t *jb, switch_rtp_packet_t *packet, switch_size_t len) {
void *payload = packet ? (packet->ebody ? packet->ebody : packet->body) : NULL;
uint16_t payload_len = len;
if (payload && payload_len > 0) {
switch_bool_t ret = SWITCH_FALSE, *ret_p = &ret;
switch_codec_control_type_t ret_t;
switch_core_media_codec_control(jb->session, SWITCH_MEDIA_TYPE_AUDIO,
SWITCH_IO_WRITE, SCC_AUDIO_VAD,
SCCT_STRING, (void *)payload,
SCCT_INT, (void *)&payload_len,
&ret_t, (void *)&ret_p);
return ret;
}
return SWITCH_TRUE;
}
static inline void drop_ts(switch_jb_t *jb, uint32_t ts)
{
switch_jb_node_t *np;
int x = 0;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) continue;
if (ts == np->packet.header.ts) {
hide_node(np, SWITCH_FALSE);
x++;
}
}
if (x) {
sort_free_nodes(jb);
}
switch_mutex_unlock(jb->list_mutex);
}
static inline switch_jb_node_t *jb_find_lowest_seq(switch_jb_t *jb, uint32_t ts)
{
switch_jb_node_t *np, *lowest = NULL;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) continue;
if (ts && ts != np->packet.header.ts) continue;
if (!lowest || ntohs(lowest->packet.header.seq) > ntohs(np->packet.header.seq)) {
lowest = np;
}
}
switch_mutex_unlock(jb->list_mutex);
return lowest;
}
static inline switch_jb_node_t *jb_find_lowest_node(switch_jb_t *jb)
{
switch_jb_node_t *np, *lowest = NULL;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) continue;
if (!lowest || ntohl(lowest->packet.header.ts) > ntohl(np->packet.header.ts)) {
lowest = np;
}
}
switch_mutex_unlock(jb->list_mutex);
return lowest ? lowest : NULL;
}
static inline uint32_t jb_find_lowest_ts(switch_jb_t *jb)
{
switch_jb_node_t *lowest = jb_find_lowest_node(jb);
return lowest ? lowest->packet.header.ts : 0;
}
#if 0
static inline void thin_frames(switch_jb_t *jb, int freq, int max)
{
switch_jb_node_t *node, *this_node;
int i = -1;
int dropped = 0;
switch_mutex_lock(jb->list_mutex);
node = jb->node_list;
while (node && dropped <= max) {
this_node = node;
node = node->next;
if (this_node->visible) {
i++;
} else {
continue;
}
if ((i % freq) == 0) {
drop_ts(jb, this_node->packet.header.ts);
dropped++;
}
}
sort_free_nodes(jb);
switch_mutex_unlock(jb->list_mutex);
}
static inline switch_jb_node_t *jb_find_highest_node(switch_jb_t *jb)
{
switch_jb_node_t *np, *highest = NULL;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) continue;
if (!highest || ntohl(highest->packet.header.ts) < ntohl(np->packet.header.ts)) {
highest = np;
}
}
switch_mutex_unlock(jb->list_mutex);
return highest ? highest : NULL;
}
static inline uint32_t jb_find_highest_ts(switch_jb_t *jb)
{
switch_jb_node_t *highest = jb_find_highest_node(jb);
return highest ? highest->packet.header.ts : 0;
}
static inline void drop_newest_frame(switch_jb_t *jb)
{
uint32_t ts = jb_find_highest_ts(jb);
drop_ts(jb, ts);
jb_debug(jb, 1, "Dropping highest frame ts:%u\n", ntohl(ts));
}
static inline switch_jb_node_t *jb_find_penultimate_node(switch_jb_t *jb)
{
switch_jb_node_t *np, *highest = NULL, *second_highest = NULL;
switch_mutex_lock(jb->list_mutex);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) continue;
if (!highest || ntohl(highest->packet.header.ts) < ntohl(np->packet.header.ts)) {
if (highest) second_highest = highest;
highest = np;
}
}
switch_mutex_unlock(jb->list_mutex);
return second_highest ? second_highest : highest;
}
#endif
static inline void jb_hit(switch_jb_t *jb)
{
jb->period_good_count++;
jb->consec_good_count++;
jb->consec_miss_count = 0;
}
static void jb_frame_inc_line(switch_jb_t *jb, int i, int line)
{
uint32_t old_frame_len = jb->frame_len;
if (i == 0) {
jb->frame_len = jb->min_frame_len;
goto end;
}
if (i > 0) {
if ((jb->frame_len + i) < jb->max_frame_len) {
jb->frame_len += i;
} else {
jb->frame_len = jb->max_frame_len;
}
goto end;
}
/* i < 0 */
if ((jb->frame_len + i) > jb->min_frame_len) {
jb->frame_len += i;
} else {
jb->frame_len = jb->min_frame_len;
}
end:
if (jb->frame_len > jb->highest_frame_len) {
jb->highest_frame_len = jb->frame_len;
}
if (old_frame_len != jb->frame_len) {
jb_debug(jb, 1, "%d Change framelen from %u to %u\n", line, old_frame_len, jb->frame_len);
//if (jb->session) {
// switch_core_session_request_video_refresh(jb->session);
//}
}
}
#define jb_frame_inc(_jb, _i) jb_frame_inc_line(_jb, _i, __LINE__)
static inline void jb_miss(switch_jb_t *jb)
{
jb->period_miss_count++;
jb->consec_miss_count++;
jb->consec_good_count = 0;
}
#if 0
static inline int verify_oldest_frame(switch_jb_t *jb)
{
switch_jb_node_t *lowest = NULL, *np = NULL;
int r = 0;
lowest = jb_find_lowest_node(jb);
if (!lowest || !(lowest = jb_find_lowest_seq(jb, lowest->packet.header.ts))) {
goto end;
}
switch_mutex_lock(jb->mutex);
jb->node_list = sort_nodes(jb->node_list, node_cmp);
for (np = lowest->next; np; np = np->next) {
if (!np->visible) continue;
if (ntohs(np->packet.header.seq) != ntohs(np->prev->packet.header.seq) + 1) {
uint32_t val = (uint32_t)htons(ntohs(np->prev->packet.header.seq) + 1);
if (!switch_core_inthash_find(jb->missing_seq_hash, val)) {
switch_core_inthash_insert(jb->missing_seq_hash, val, (void *)(intptr_t)1);
}
break;
}
if (np->packet.header.ts != lowest->packet.header.ts || !np->next) {
r = 1;
}
}
switch_mutex_unlock(jb->mutex);
end:
return r;
}
#endif
static inline void drop_oldest_frame(switch_jb_t *jb)
{
uint32_t ts = jb_find_lowest_ts(jb);
drop_ts(jb, ts);
jb_debug(jb, 1, "Dropping oldest frame ts:%u\n", ntohl(ts));
}
#if 0
static inline void drop_second_newest_frame(switch_jb_t *jb)
{
switch_jb_node_t *second_newest = jb_find_penultimate_node(jb);
if (second_newest) {
drop_ts(jb, second_newest->packet.header.ts);
jb_debug(jb, 1, "Dropping second highest frame ts:%u\n", ntohl(second_newest->packet.header.ts));
}
}
#endif
static inline int check_seq(uint16_t a, uint16_t b)
{
a = ntohs(a);
b = ntohs(b);
if (a >= b || (b > a && b > USHRT_MAX / 2 && a < USHRT_MAX / 2)) {
return 1;
}
return 0;
}
static inline int check_ts(uint32_t a, uint32_t b)
{
a = ntohl(a);
b = ntohl(b);
if (a > b || (b > a && b > UINT_MAX / 2 && a < UINT_MAX / 2)) {
return 1;
}
return 0;
}
static inline void add_node(switch_jb_t *jb, switch_rtp_packet_t *packet, switch_size_t len)
{
switch_jb_node_t *node = new_node(jb);
if (!node) {
return;
}
node->packet = *packet;
node->len = len;
switch_core_inthash_insert(jb->node_hash, node->packet.header.seq, node);
if (jb->node_hash_ts) {
switch_core_inthash_insert(jb->node_hash_ts, node->packet.header.ts, node);
}
jb_debug(jb, (packet->header.m ? 2 : 3), "PUT packet last_ts:%u ts:%u seq:%u%s\n",
ntohl(jb->highest_wrote_ts), ntohl(node->packet.header.ts), ntohs(node->packet.header.seq), packet->header.m ? " <MARK>" : "");
if (jb->write_init && jb->type == SJB_VIDEO) {
int seq_diff = 0, ts_diff = 0;
if (ntohs(jb->highest_wrote_seq) > (USHRT_MAX - 100) && ntohs(packet->header.seq) < 100) {
seq_diff = (USHRT_MAX - ntohs(jb->highest_wrote_seq)) + ntohs(packet->header.seq);
} else {
seq_diff = abs(((int)ntohs(packet->header.seq) - ntohs(jb->highest_wrote_seq)));
}
if (ntohl(jb->highest_wrote_ts) > (UINT_MAX - 1000) && ntohl(node->packet.header.ts) < 1000) {
ts_diff = (UINT_MAX - ntohl(node->packet.header.ts)) + ntohl(node->packet.header.ts);
} else {
ts_diff = abs((int)((int64_t)ntohl(node->packet.header.ts) - (int64_t)ntohl(jb->highest_wrote_ts)));
}
if (((seq_diff >= 100) || (ts_diff > (900000 * 5)))) {
jb_debug(jb, 2, "CHANGE DETECTED, PUNT %u\n", abs(((int)ntohs(packet->header.seq) - ntohs(jb->highest_wrote_seq))));
jb->jitter.stats.reset_ts_jump++;
switch_jb_reset(jb);
}
}
if (!jb->write_init || ntohs(packet->header.seq) > ntohs(jb->highest_wrote_seq) ||
(ntohs(jb->highest_wrote_seq) > USHRT_MAX - 100 && ntohs(packet->header.seq) < 100) ) {
jb->highest_wrote_seq = packet->header.seq;
}
if (jb->type == SJB_VIDEO) {
jb->packet_count++;
if (jb->write_init && check_seq(packet->header.seq, jb->highest_wrote_seq) && check_ts(node->packet.header.ts, jb->highest_wrote_ts)) {
jb_debug(jb, 2, "WRITE frame ts: %u complete=%u/%u n:%u\n", ntohl(node->packet.header.ts), jb->complete_frames , jb->frame_len, jb->visible_nodes);
jb->highest_wrote_ts = packet->header.ts;
jb->complete_frames++;
jb->packet_count--;
if (jb->packet_count > jb->max_packet_len) {
jb->max_packet_len = jb->packet_count;
}
jb->packet_count = 1;
node->complete_frame_mark = TRUE;
} else if (!jb->write_init) {
jb->highest_wrote_ts = packet->header.ts;
}
} else {
if (jb->write_init || jb->type == SJB_TEXT || jb->type == SJB_AUDIO) {
jb_debug(jb, 2, "WRITE frame ts: %u complete=%u/%u n:%u\n", ntohl(node->packet.header.ts), jb->complete_frames , jb->frame_len, jb->visible_nodes);
jb->complete_frames++;
} else {
jb->highest_wrote_ts = packet->header.ts;
}
}
if (!jb->write_init) jb->write_init = 1;
}
static inline void increment_ts(switch_jb_t *jb)
{
if (!jb->target_ts) return;
jb->last_psuedo_seq = jb->psuedo_seq;
jb->last_target_ts = jb->target_ts;
jb->target_ts = htonl((ntohl(jb->target_ts) + jb->samples_per_frame));
jb->psuedo_seq++;
}
static inline void set_read_ts(switch_jb_t *jb, uint32_t ts)
{
if (!ts) return;
jb->last_psuedo_seq = jb->psuedo_seq;
jb->last_target_ts = ts;
jb->target_ts = htonl((ntohl(jb->last_target_ts) + jb->samples_per_frame));
jb->psuedo_seq++;
}
static inline void increment_seq(switch_jb_t *jb)
{
jb->last_target_seq = jb->target_seq;
jb->target_seq = htons((ntohs(jb->target_seq) + 1));
}
static inline void decrement_seq(switch_jb_t *jb)
{
jb->last_target_seq = jb->target_seq;
jb->target_seq = htons((ntohs(jb->target_seq) - 1));
}
static inline void set_read_seq(switch_jb_t *jb, uint16_t seq)
{
jb->last_target_seq = seq;
jb->target_seq = htons((ntohs(jb->last_target_seq) + 1));
}
static inline switch_status_t jb_next_packet_by_seq(switch_jb_t *jb, switch_jb_node_t **nodep)
{
switch_jb_node_t *node = NULL;
top:
if (jb->type == SJB_VIDEO) {
if (jb->dropped) {
jb->dropped = 0;
jb_debug(jb, 2, "%s", "DROPPED FRAME DETECTED RESYNCING\n");
jb->target_seq = 0;
if (jb->session) {
switch_core_session_request_video_refresh(jb->session);
}
}
}
if (!jb->target_seq) {
if ((node = switch_core_inthash_find(jb->node_hash, jb->target_seq))) {
jb_debug(jb, 2, "FOUND rollover seq: %u\n", ntohs(jb->target_seq));
} else if ((node = jb_find_lowest_seq(jb, 0))) {
jb_debug(jb, 2, "No target seq using seq: %u as a starting point\n", ntohs(node->packet.header.seq));
} else {
jb_debug(jb, 1, "%s", "No nodes available....\n");
}
jb_hit(jb);
} else if ((node = switch_core_inthash_find(jb->node_hash, jb->target_seq))) {
jb_debug(jb, 2, "FOUND desired seq: %u\n", ntohs(jb->target_seq));
jb_hit(jb);
} else {
jb_debug(jb, 2, "MISSING desired seq: %u\n", ntohs(jb->target_seq));
jb_miss(jb);
if (jb->type == SJB_VIDEO) {
int x;
if (jb->session) {
switch_core_session_request_video_refresh(jb->session);
}
for (x = 0; x < 10; x++) {
increment_seq(jb);
if ((node = switch_core_inthash_find(jb->node_hash, jb->target_seq))) {
jb_debug(jb, 2, "FOUND incremental seq: %u\n", ntohs(jb->target_seq));
if (node->packet.header.m || node->packet.header.ts == jb->highest_read_ts) {
jb_debug(jb, 2, "%s", "SAME FRAME DROPPING\n");
jb->dropped++;
drop_ts(jb, node->packet.header.ts);
jb->highest_dropped_ts = ntohl(node->packet.header.ts);
if (jb->period_miss_count > 2 && jb->period_miss_inc < 1) {
jb->period_miss_inc++;
jb_frame_inc(jb, 1);
}
node = NULL;
goto top;
}
break;
} else {
jb_debug(jb, 2, "MISSING incremental seq: %u\n", ntohs(jb->target_seq));
}
}
} else {
increment_seq(jb);
}
}
*nodep = node;
if (node) {
set_read_seq(jb, node->packet.header.seq);
return SWITCH_STATUS_SUCCESS;
}
return SWITCH_STATUS_NOTFOUND;
}
static inline switch_status_t jb_next_packet_by_ts(switch_jb_t *jb, switch_jb_node_t **nodep)
{
switch_jb_node_t *node = NULL;
if (!jb->target_ts) {
if ((node = jb_find_lowest_node(jb))) {
jb_debug(jb, 2, "No target ts using ts: %u as a starting point\n", ntohl(node->packet.header.ts));
} else {
jb_debug(jb, 1, "%s", "No nodes available....\n");
}
jb_hit(jb);
} else if ((node = switch_core_inthash_find(jb->node_hash_ts, jb->target_ts))) {
jb_debug(jb, 2, "FOUND desired ts: %u\n", ntohl(jb->target_ts));
jb_hit(jb);
} else {
jb_debug(jb, 2, "MISSING desired ts: %u\n", ntohl(jb->target_ts));
jb_miss(jb);
increment_ts(jb);
}
*nodep = node;
if (node) {
set_read_ts(jb, node->packet.header.ts);
node->packet.header.seq = htons(jb->psuedo_seq);
return SWITCH_STATUS_SUCCESS;
}
return SWITCH_STATUS_NOTFOUND;
}
static inline int check_jb_size(switch_jb_t *jb)
{
switch_jb_node_t *np;
uint16_t seq_hs, target_seq_hs;
uint16_t l_seq = 0;
uint16_t h_seq = 0;
uint16_t count = 0;
uint16_t old = 0;
switch_mutex_lock(jb->list_mutex);
target_seq_hs = ntohs(jb->target_seq);
for (np = jb->node_list; np; np = np->next) {
if (!np->visible) {
continue;
}
seq_hs = ntohs(np->packet.header.seq);
if (target_seq_hs > seq_hs) {
hide_node(np, SWITCH_FALSE);
old++;
continue;
}
if (count == 0) {
l_seq = h_seq = seq_hs;
}
count++;
if (seq_hs < l_seq) {
l_seq = seq_hs;
}
if (seq_hs > h_seq) {
h_seq = seq_hs;
}
}
if (count > jb->jitter.stats.size_max) {
jb->jitter.stats.size_max = count;
}
if (jb->jitter.stats.size_est == 0) {
jb->jitter.stats.size_est = count;
} else {
jb->jitter.stats.size_est = ((99 * jb->jitter.stats.size_est) + (1 * count)) / 100;
}
/* update the stats every x packets */
if (target_seq_hs % 50 == 0) {
int packet_ms = jb->jitter.samples_per_frame / (jb->jitter.samples_per_second / 1000);
jb->jitter.stats.estimate_ms = (*jb->jitter.estimate) / jb->jitter.samples_per_second * 1000;
if (jb->channel) {
switch_channel_set_variable_printf(jb->channel, "rtp_jb_size_max_ms", "%u", jb->jitter.stats.size_max * packet_ms);
switch_channel_set_variable_printf(jb->channel, "rtp_jb_size_est_ms", "%u", jb->jitter.stats.size_est * packet_ms);
switch_channel_set_variable_printf(jb->channel, "rtp_jb_acceleration_ms", "%u", jb->jitter.stats.acceleration * packet_ms);
switch_channel_set_variable_printf(jb->channel, "rtp_jb_expand_ms", "%u", jb->jitter.stats.expand * packet_ms);
}
if (jb->jitter.stats.jitter_max_ms < jb->jitter.stats.estimate_ms) {
jb->jitter.stats.jitter_max_ms = jb->jitter.stats.estimate_ms;
}
if (jb->channel) {
switch_channel_set_variable_printf(jb->channel, "rtp_jb_jitter_max_ms", "%u", jb->jitter.stats.jitter_max_ms);
switch_channel_set_variable_printf(jb->channel, "rtp_jb_jitter_est_ms", "%u", jb->jitter.stats.estimate_ms);
}
}
if (old) {
sort_free_nodes(jb);
}
switch_mutex_unlock(jb->list_mutex);
jb_debug(jb, SWITCH_LOG_INFO, "JITTER buffersize %u == %u old[%u] target[%u] seq[%u|%u]\n", count, h_seq - l_seq + 1, old, target_seq_hs, l_seq, h_seq);
return count;
}
static inline switch_status_t jb_next_packet_by_seq_with_acceleration(switch_jb_t *jb, switch_jb_node_t **nodep)
{
switch_status_t status = jb_next_packet_by_seq(jb, nodep);
switch_rtp_packet_t *packet;
uint32_t len;