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384 lines
9.9 KiB
384 lines
9.9 KiB
#include "jitter_buffer.h"
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#include "timerthread.h"
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#include "media_socket.h"
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#include "call.h"
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#include "codec.h"
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#include "main.h"
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#include <math.h>
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#include <errno.h>
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#define INITIAL_PACKETS 0x1E
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#define CONT_SEQ_COUNT 0x1F4
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#define CONT_MISS_COUNT 0x0A
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#define CLOCK_DRIFT_MULT 0x14
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#define ONE_MS 0x64
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static struct timerthread jitter_buffer_thread;
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void jitter_buffer_init(void) {
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ilog(LOG_DEBUG, "jitter_buffer_init");
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timerthread_init(&jitter_buffer_thread, timerthread_queue_run);
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}
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// jb is locked
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static void reset_jitter_buffer(struct jitter_buffer *jb) {
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ilog(LOG_INFO, "reset_jitter_buffer");
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jb->first_send_ts = 0;
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jb->first_send.tv_sec = 0;
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jb->first_send.tv_usec = 0;
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jb->first_seq = 0;
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jb->rtptime_delta = 0;
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jb->buffer_len = 0;
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jb->cont_frames = 0;
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jb->cont_miss = 0;
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jb->next_exp_seq = 0;
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jb->clock_rate = 0;
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jb->payload_type = 0;
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jb->drift_mult_factor = 0;
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jb->buf_decremented = 0;
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jb->clock_drift_val = 0;
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jb->num_resets++;
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//disable jitter buffer in case of more than 2 resets
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if(jb->num_resets > 2 && jb->call)
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jb->disabled = 1;
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}
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static struct rtp_payload_type *get_rtp_payload_type(struct media_packet *mp, int payload_type) {
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struct rtp_payload_type *rtp_pt = NULL;
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struct codec_handler *transcoder = codec_handler_get(mp->media, payload_type);
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if(transcoder) {
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if(transcoder->source_pt.payload_type == payload_type)
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rtp_pt = &transcoder->source_pt;
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if(transcoder->dest_pt.payload_type == payload_type)
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rtp_pt = &transcoder->dest_pt;
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}
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return rtp_pt;
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}
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static int get_clock_rate(struct media_packet *mp, int payload_type) {
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struct jitter_buffer *jb = mp->stream->jb;
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int clock_rate = 0;
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if(jb->clock_rate && jb->payload_type == payload_type)
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return jb->clock_rate;
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const struct rtp_payload_type *rtp_pt = get_rtp_payload_type(mp, payload_type);
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if(rtp_pt) {
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if(rtp_pt->codec_def && !rtp_pt->codec_def->dtmf) {
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clock_rate = jb->clock_rate = rtp_pt->clock_rate;
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jb->payload_type = payload_type;
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}
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else
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clock_rate = jb->clock_rate; //dtmf packet continue with same clockrate
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}
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else
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ilog(LOG_DEBUG, "clock_rate not present payload_type = %d", payload_type);
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return clock_rate;
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}
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static struct jb_packet* get_jb_packet(struct media_packet *mp, const str *s) {
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char *buf = malloc(s->len + RTP_BUFFER_HEAD_ROOM + RTP_BUFFER_TAIL_ROOM);
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if (!buf) {
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ilog(LOG_ERROR, "Failed to allocate memory: %s", strerror(errno));
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return NULL;
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}
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struct jb_packet *p = g_slice_alloc0(sizeof(*p));
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p->buf = buf;
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p->mp = *mp;
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obj_hold(p->mp.sfd);
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str_init_len(&p->mp.raw, buf + RTP_BUFFER_HEAD_ROOM, s->len);
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memcpy(p->mp.raw.s, s->s, s->len);
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if(rtp_payload(&p->mp.rtp, &p->mp.payload, &p->mp.raw)) {
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jb_packet_free(&p);
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return NULL;
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}
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return p;
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}
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// jb is locked
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static void check_buffered_packets(struct jitter_buffer *jb) {
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if (g_tree_nnodes(jb->ttq.entries) >= (2* rtpe_config.jb_length)) {
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ilog(LOG_DEBUG, "Jitter reset due to buffer overflow");
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reset_jitter_buffer(jb);
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}
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}
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// jb is locked
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static int queue_packet(struct media_packet *mp, struct jb_packet *p) {
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struct jitter_buffer *jb = mp->stream->jb;
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unsigned long ts = ntohl(mp->rtp->timestamp);
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int payload_type = (mp->rtp->m_pt & 0x7f);
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int clockrate = get_clock_rate(mp, payload_type);
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if(!clockrate || !jb->first_send.tv_sec) {
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ilog(LOG_DEBUG, "Jitter reset due to clockrate");
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reset_jitter_buffer(jb);
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return 1;
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}
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long ts_diff = (uint32_t) ts - (uint32_t) jb->first_send_ts;
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int seq_diff = ntohs(mp->rtp->seq_num) - jb->first_seq;
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if(!jb->rtptime_delta && seq_diff) {
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jb->rtptime_delta = ts_diff/seq_diff;
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}
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p->ttq_entry.when = jb->first_send;
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long long ts_diff_us =
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(long long) (ts_diff + (jb->rtptime_delta * jb->buffer_len))* 1000000 / clockrate;
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ts_diff_us += (jb->clock_drift_val * seq_diff);
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ts_diff_us += (jb->dtmf_mult_factor * ONE_MS);
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if(jb->buf_decremented) {
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ts_diff_us += 5000; //add 5ms delta when 2 packets are scheduled around same time
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jb->buf_decremented = 0;
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}
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timeval_add_usec(&p->ttq_entry.when, ts_diff_us);
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ts_diff_us = timeval_diff(&p->ttq_entry.when, &rtpe_now);
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if (ts_diff_us > 1000000) { // more than one second, can't be right
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ilog(LOG_DEBUG, "Partial reset due to timestamp");
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jb->first_send.tv_sec = 0;
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return 1;
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}
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timerthread_queue_push(&jb->ttq, &p->ttq_entry);
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return 0;
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}
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static void handle_clock_drift(struct media_packet *mp) {
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ilog(LOG_DEBUG, "handle_clock_drift");
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struct jitter_buffer *jb = mp->stream->jb;
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int seq_diff = ntohs(mp->rtp->seq_num) - jb->first_seq;
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int mult_factor = pow(2, jb->drift_mult_factor);
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if(seq_diff < (mult_factor * CLOCK_DRIFT_MULT))
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return;
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unsigned long ts = ntohl(mp->rtp->timestamp);
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int payload_type = (mp->rtp->m_pt & 0x7f);
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int clockrate = get_clock_rate(mp, payload_type);
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if(!clockrate) {
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return;
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}
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long ts_diff = (uint32_t) ts - (uint32_t) jb->first_send_ts;
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long long ts_diff_us =
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(long long) (ts_diff)* 1000000 / clockrate;
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struct timeval to_send = jb->first_send;
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timeval_add_usec(&to_send, ts_diff_us);
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long long time_diff = timeval_diff(&rtpe_now, &to_send);
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jb->clock_drift_val = time_diff/seq_diff;
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jb->drift_mult_factor++;
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}
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int buffer_packet(struct media_packet *mp, const str *s) {
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struct jb_packet *p = NULL;
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int ret = 1; // must call stream_packet
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mp->stream = mp->sfd->stream;
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mp->media = mp->stream->media;
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mp->call = mp->sfd->call;
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struct call *call = mp->call;
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rwlock_lock_r(&call->master_lock);
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struct jitter_buffer *jb = mp->stream->jb;
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if (!jb || jb->disabled || PS_ISSET(mp->sfd->stream, RTCP))
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goto end;
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p = get_jb_packet(mp, s);
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if (!p)
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goto end;
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ilog(LOG_DEBUG, "Handling JB packet on: %s:%d", sockaddr_print_buf(&mp->stream->endpoint.address),
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mp->stream->endpoint.port);
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mp = &p->mp;
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int payload_type = (mp->rtp->m_pt & 0x7f);
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mutex_lock(&jb->lock);
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if((jb->clock_rate && jb->payload_type != payload_type) ||
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(jb->first_send.tv_sec && jb->ssrc != ntohl(mp->rtp->ssrc))) { //reset in case of payload change or ssrc change
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const struct rtp_payload_type *rtp_pt = get_rtp_payload_type(mp, payload_type);
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if(rtp_pt) {
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if(rtp_pt->codec_def && !rtp_pt->codec_def->dtmf)
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jb->first_send.tv_sec = 0;
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if(rtp_pt->codec_def->dtmf)
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jb->dtmf_mult_factor++;
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else
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jb->dtmf_mult_factor=0;
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}
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}
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if (jb->first_send.tv_sec) {
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if(rtpe_config.jb_clock_drift)
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handle_clock_drift(mp);
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ret = queue_packet(mp,p);
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}
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else {
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// store data from first packet and use for successive packets and queue the first packet
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unsigned long ts = ntohl(mp->rtp->timestamp);
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int payload_type = (mp->rtp->m_pt & 0x7f);
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int clockrate = get_clock_rate(mp, payload_type);
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if(!clockrate){
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jb->initial_pkts++;
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if(jb->initial_pkts > INITIAL_PACKETS) { //Ignore initial Payload Type 126 if any
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reset_jitter_buffer(jb);
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}
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goto end_unlock;
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}
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p->ttq_entry.when = jb->first_send = rtpe_now;
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jb->first_send_ts = ts;
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jb->first_seq = ntohs(mp->rtp->seq_num);
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jb->ssrc = ntohl(mp->rtp->ssrc);
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if(jb->buffer_len > 0)
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ret = queue_packet(mp,p);
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jb->rtptime_delta = 0;
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jb->next_exp_seq = 0;
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jb->drift_mult_factor = 0;
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}
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// packet consumed?
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if (ret == 0)
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p = NULL;
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check_buffered_packets(jb);
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end_unlock:
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mutex_unlock(&jb->lock);
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end:
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rwlock_unlock_r(&call->master_lock);
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if (p)
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jb_packet_free(&p);
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return ret;
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}
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static void increment_buffer(struct jitter_buffer *jb) {
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if(jb->buffer_len < rtpe_config.jb_length)
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jb->buffer_len++;
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}
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static void decrement_buffer(struct jitter_buffer *jb) {
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if(jb->buffer_len > 0) {
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jb->buffer_len--;
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jb->buf_decremented = 1;
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}
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}
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static void set_jitter_values(struct media_packet *mp) {
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struct jitter_buffer *jb = mp->stream->jb;
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if(!jb || !mp->rtp)
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return;
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int curr_seq = ntohs(mp->rtp->seq_num);
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if(jb->next_exp_seq) {
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mutex_lock(&jb->lock);
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if(curr_seq > jb->next_exp_seq) {
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ilog(LOG_DEBUG, "missing seq exp seq =%d, received seq= %d", jb->next_exp_seq, curr_seq);
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increment_buffer(jb);
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jb->cont_frames = 0;
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jb->cont_miss++;
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}
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else if(curr_seq < jb->next_exp_seq) { //Might be duplicate or sequence already crossed
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jb->cont_frames = 0;
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}
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else {
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jb->cont_frames++;
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jb->cont_miss = 0;
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if(jb->cont_frames >= CONT_SEQ_COUNT) {
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decrement_buffer(jb);
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jb->cont_frames = 0;
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ilog(LOG_DEBUG, "Received continous frames Buffer len=%d", jb->buffer_len);
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}
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}
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if(jb->cont_miss >= CONT_MISS_COUNT)
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reset_jitter_buffer(jb);
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mutex_unlock(&jb->lock);
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}
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if(curr_seq >= jb->next_exp_seq)
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jb->next_exp_seq = curr_seq + 1;
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}
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static void __jb_send_later(struct timerthread_queue *ttq, void *p) {
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struct jb_packet *cp = p;
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set_jitter_values(&cp->mp);
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play_buffered(p);
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};
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// jb and call are locked
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static void __jb_send_now(struct timerthread_queue *ttq, void *p) {
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struct jitter_buffer *jb = (void *) ttq;
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mutex_unlock(&jb->lock);
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rwlock_unlock_r(&jb->call->master_lock);
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__jb_send_later(ttq, p);
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rwlock_lock_r(&jb->call->master_lock);
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mutex_lock(&jb->lock);
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};
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static void __jb_free(void *p) {
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struct jitter_buffer *jb = p;
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jitter_buffer_free(&jb);
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}
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void __jb_packet_free(void *p) {
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struct jb_packet *jbp = p;
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jb_packet_free(&jbp);
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}
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void jitter_buffer_loop(void *p) {
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ilog(LOG_DEBUG, "jitter_buffer_loop");
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timerthread_run(&jitter_buffer_thread);
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}
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struct jitter_buffer *jitter_buffer_new(struct call *c) {
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ilog(LOG_DEBUG, "creating jitter_buffer");
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struct jitter_buffer *jb = timerthread_queue_new("jitter_buffer", sizeof(*jb),
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&jitter_buffer_thread,
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__jb_send_now,
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__jb_send_later,
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__jb_free, __jb_packet_free);
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mutex_init(&jb->lock);
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jb->call = obj_get(c);
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return jb;
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}
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void jitter_buffer_free(struct jitter_buffer **jbp) {
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if (!jbp || !*jbp)
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return;
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ilog(LOG_DEBUG, "freeing jitter_buffer");
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mutex_destroy(&(*jbp)->lock);
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if ((*jbp)->call)
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obj_put((*jbp)->call);
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}
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void jb_packet_free(struct jb_packet **jbp) {
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if (!jbp || !*jbp)
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return;
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free((*jbp)->buf);
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if ((*jbp)->mp.sfd)
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obj_put((*jbp)->mp.sfd);
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g_slice_free1(sizeof(**jbp), *jbp);
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*jbp = NULL;
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}
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