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-rw-r--r--1.4.23-rc4/main/jitterbuf.c839
1 files changed, 839 insertions, 0 deletions
diff --git a/1.4.23-rc4/main/jitterbuf.c b/1.4.23-rc4/main/jitterbuf.c
new file mode 100644
index 000000000..849cffab5
--- /dev/null
+++ b/1.4.23-rc4/main/jitterbuf.c
@@ -0,0 +1,839 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2004-2005, Horizon Wimba, Inc.
+ *
+ * Contributors:
+ * Steve Kann <stevek@stevek.com>
+ *
+ * A license has been granted to Digium (via disclaimer) for the use of
+ * this code.
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief jitterbuf: an application-independent jitterbuffer
+ * \author Steve Kann <stevek@stevek.com>
+ *
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "jitterbuf.h"
+#include "asterisk/utils.h"
+
+/*! define these here, just for ancient compiler systems */
+#define JB_LONGMAX 2147483647L
+#define JB_LONGMIN (-JB_LONGMAX - 1L)
+
+#define jb_warn(...) (warnf ? warnf(__VA_ARGS__) : (void)0)
+#define jb_err(...) (errf ? errf(__VA_ARGS__) : (void)0)
+#define jb_dbg(...) (dbgf ? dbgf(__VA_ARGS__) : (void)0)
+
+#ifdef DEEP_DEBUG
+#define jb_dbg2(...) (dbgf ? dbgf(__VA_ARGS__) : (void)0)
+#else
+#define jb_dbg2(...) ((void)0)
+#endif
+
+static jb_output_function_t warnf, errf, dbgf;
+
+void jb_setoutput(jb_output_function_t err, jb_output_function_t warn, jb_output_function_t dbg)
+{
+ errf = err;
+ warnf = warn;
+ dbgf = dbg;
+}
+
+static void increment_losspct(jitterbuf *jb)
+{
+ jb->info.losspct = (100000 + 499 * jb->info.losspct)/500;
+}
+
+static void decrement_losspct(jitterbuf *jb)
+{
+ jb->info.losspct = (499 * jb->info.losspct)/500;
+}
+
+void jb_reset(jitterbuf *jb)
+{
+ /* only save settings */
+ jb_conf s = jb->info.conf;
+ memset(jb, 0, sizeof(*jb));
+ jb->info.conf = s;
+
+ /* initialize length */
+ jb->info.current = jb->info.target = JB_TARGET_EXTRA;
+ jb->info.silence_begin_ts = -1;
+}
+
+jitterbuf * jb_new()
+{
+ jitterbuf *jb;
+
+ if (!(jb = ast_malloc(sizeof(*jb))))
+ return NULL;
+
+ jb_reset(jb);
+
+ jb_dbg2("jb_new() = %x\n", jb);
+ return jb;
+}
+
+void jb_destroy(jitterbuf *jb)
+{
+ jb_frame *frame;
+ jb_dbg2("jb_destroy(%x)\n", jb);
+
+ /* free all the frames on the "free list" */
+ frame = jb->free;
+ while (frame != NULL) {
+ jb_frame *next = frame->next;
+ free(frame);
+ frame = next;
+ }
+
+ /* free ourselves! */
+ free(jb);
+}
+
+
+
+#if 0
+static int longcmp(const void *a, const void *b)
+{
+ return *(long *)a - *(long *)b;
+}
+#endif
+
+/*! \brief simple history manipulation
+ \note maybe later we can make the history buckets variable size, or something? */
+/* drop parameter determines whether we will drop outliers to minimize
+ * delay */
+static int history_put(jitterbuf *jb, long ts, long now, long ms)
+{
+ long delay = now - (ts - jb->info.resync_offset);
+ long threshold = 2 * jb->info.jitter + jb->info.conf.resync_threshold;
+ long kicked;
+
+ /* don't add special/negative times to history */
+ if (ts <= 0)
+ return 0;
+
+ /* check for drastic change in delay */
+ if (jb->info.conf.resync_threshold != -1) {
+ if (abs(delay - jb->info.last_delay) > threshold) {
+ jb->info.cnt_delay_discont++;
+ if (jb->info.cnt_delay_discont > 3) {
+ /* resync the jitterbuffer */
+ jb->info.cnt_delay_discont = 0;
+ jb->hist_ptr = 0;
+ jb->hist_maxbuf_valid = 0;
+
+ jb_warn("Resyncing the jb. last_delay %ld, this delay %ld, threshold %ld, new offset %ld\n", jb->info.last_delay, delay, threshold, ts - now);
+ jb->info.resync_offset = ts - now;
+ jb->info.last_delay = delay = 0; /* after resync, frame is right on time */
+ } else {
+ return -1;
+ }
+ } else {
+ jb->info.last_delay = delay;
+ jb->info.cnt_delay_discont = 0;
+ }
+ }
+
+ kicked = jb->history[jb->hist_ptr % JB_HISTORY_SZ];
+
+ jb->history[(jb->hist_ptr++) % JB_HISTORY_SZ] = delay;
+
+ /* optimization; the max/min buffers don't need to be recalculated, if this packet's
+ * entry doesn't change them. This happens if this packet is not involved, _and_ any packet
+ * that got kicked out of the history is also not involved
+ * We do a number of comparisons, but it's probably still worthwhile, because it will usually
+ * succeed, and should be a lot faster than going through all 500 packets in history */
+ if (!jb->hist_maxbuf_valid)
+ return 0;
+
+ /* don't do this until we've filled history
+ * (reduces some edge cases below) */
+ if (jb->hist_ptr < JB_HISTORY_SZ)
+ goto invalidate;
+
+ /* if the new delay would go into min */
+ if (delay < jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1])
+ goto invalidate;
+
+ /* or max.. */
+ if (delay > jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1])
+ goto invalidate;
+
+ /* or the kicked delay would be in min */
+ if (kicked <= jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1])
+ goto invalidate;
+
+ if (kicked >= jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1])
+ goto invalidate;
+
+ /* if we got here, we don't need to invalidate, 'cause this delay didn't
+ * affect things */
+ return 0;
+ /* end optimization */
+
+
+invalidate:
+ jb->hist_maxbuf_valid = 0;
+ return 0;
+}
+
+static void history_calc_maxbuf(jitterbuf *jb)
+{
+ int i,j;
+
+ if (jb->hist_ptr == 0)
+ return;
+
+
+ /* initialize maxbuf/minbuf to the latest value */
+ for (i=0;i<JB_HISTORY_MAXBUF_SZ;i++) {
+/*
+ * jb->hist_maxbuf[i] = jb->history[(jb->hist_ptr-1) % JB_HISTORY_SZ];
+ * jb->hist_minbuf[i] = jb->history[(jb->hist_ptr-1) % JB_HISTORY_SZ];
+ */
+ jb->hist_maxbuf[i] = JB_LONGMIN;
+ jb->hist_minbuf[i] = JB_LONGMAX;
+ }
+
+ /* use insertion sort to populate maxbuf */
+ /* we want it to be the top "n" values, in order */
+
+ /* start at the beginning, or JB_HISTORY_SZ frames ago */
+ i = (jb->hist_ptr > JB_HISTORY_SZ) ? (jb->hist_ptr - JB_HISTORY_SZ) : 0;
+
+ for (;i<jb->hist_ptr;i++) {
+ long toins = jb->history[i % JB_HISTORY_SZ];
+
+ /* if the maxbuf should get this */
+ if (toins > jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1]) {
+
+ /* insertion-sort it into the maxbuf */
+ for (j=0;j<JB_HISTORY_MAXBUF_SZ;j++) {
+ /* found where it fits */
+ if (toins > jb->hist_maxbuf[j]) {
+ /* move over */
+ memmove(jb->hist_maxbuf + j + 1, jb->hist_maxbuf + j, (JB_HISTORY_MAXBUF_SZ - (j + 1)) * sizeof(jb->hist_maxbuf[0]));
+ /* insert */
+ jb->hist_maxbuf[j] = toins;
+
+ break;
+ }
+ }
+ }
+
+ /* if the minbuf should get this */
+ if (toins < jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1]) {
+
+ /* insertion-sort it into the maxbuf */
+ for (j=0;j<JB_HISTORY_MAXBUF_SZ;j++) {
+ /* found where it fits */
+ if (toins < jb->hist_minbuf[j]) {
+ /* move over */
+ memmove(jb->hist_minbuf + j + 1, jb->hist_minbuf + j, (JB_HISTORY_MAXBUF_SZ - (j + 1)) * sizeof(jb->hist_minbuf[0]));
+ /* insert */
+ jb->hist_minbuf[j] = toins;
+
+ break;
+ }
+ }
+ }
+
+ if (0) {
+ int k;
+ fprintf(stderr, "toins = %ld\n", toins);
+ fprintf(stderr, "maxbuf =");
+ for (k=0;k<JB_HISTORY_MAXBUF_SZ;k++)
+ fprintf(stderr, "%ld ", jb->hist_maxbuf[k]);
+ fprintf(stderr, "\nminbuf =");
+ for (k=0;k<JB_HISTORY_MAXBUF_SZ;k++)
+ fprintf(stderr, "%ld ", jb->hist_minbuf[k]);
+ fprintf(stderr, "\n");
+ }
+ }
+
+ jb->hist_maxbuf_valid = 1;
+}
+
+static void history_get(jitterbuf *jb)
+{
+ long max, min, jitter;
+ int index;
+ int count;
+
+ if (!jb->hist_maxbuf_valid)
+ history_calc_maxbuf(jb);
+
+ /* count is how many items in history we're examining */
+ count = (jb->hist_ptr < JB_HISTORY_SZ) ? jb->hist_ptr : JB_HISTORY_SZ;
+
+ /* index is the "n"ths highest/lowest that we'll look for */
+ index = count * JB_HISTORY_DROPPCT / 100;
+
+ /* sanity checks for index */
+ if (index > (JB_HISTORY_MAXBUF_SZ - 1))
+ index = JB_HISTORY_MAXBUF_SZ - 1;
+
+
+ if (index < 0) {
+ jb->info.min = 0;
+ jb->info.jitter = 0;
+ return;
+ }
+
+ max = jb->hist_maxbuf[index];
+ min = jb->hist_minbuf[index];
+
+ jitter = max - min;
+
+ /* these debug stmts compare the difference between looking at the absolute jitter, and the
+ * values we get by throwing away the outliers */
+ /*
+ fprintf(stderr, "[%d] min=%d, max=%d, jitter=%d\n", index, min, max, jitter);
+ fprintf(stderr, "[%d] min=%d, max=%d, jitter=%d\n", 0, jb->hist_minbuf[0], jb->hist_maxbuf[0], jb->hist_maxbuf[0]-jb->hist_minbuf[0]);
+ */
+
+ jb->info.min = min;
+ jb->info.jitter = jitter;
+}
+
+/* returns 1 if frame was inserted into head of queue, 0 otherwise */
+static int queue_put(jitterbuf *jb, void *data, const enum jb_frame_type type, long ms, long ts)
+{
+ jb_frame *frame;
+ jb_frame *p;
+ int head = 0;
+ long resync_ts = ts - jb->info.resync_offset;
+
+ if ((frame = jb->free)) {
+ jb->free = frame->next;
+ } else if (!(frame = ast_malloc(sizeof(*frame)))) {
+ jb_err("cannot allocate frame\n");
+ return 0;
+ }
+
+ jb->info.frames_cur++;
+
+ frame->data = data;
+ frame->ts = resync_ts;
+ frame->ms = ms;
+ frame->type = type;
+
+ /*
+ * frames are a circular list, jb-frames points to to the lowest ts,
+ * jb->frames->prev points to the highest ts
+ */
+
+ if (!jb->frames) { /* queue is empty */
+ jb->frames = frame;
+ frame->next = frame;
+ frame->prev = frame;
+ head = 1;
+ } else if (resync_ts < jb->frames->ts) {
+ frame->next = jb->frames;
+ frame->prev = jb->frames->prev;
+
+ frame->next->prev = frame;
+ frame->prev->next = frame;
+
+ /* frame is out of order */
+ jb->info.frames_ooo++;
+
+ jb->frames = frame;
+ head = 1;
+ } else {
+ p = jb->frames;
+
+ /* frame is out of order */
+ if (resync_ts < p->prev->ts) jb->info.frames_ooo++;
+
+ while (resync_ts < p->prev->ts && p->prev != jb->frames)
+ p = p->prev;
+
+ frame->next = p;
+ frame->prev = p->prev;
+
+ frame->next->prev = frame;
+ frame->prev->next = frame;
+ }
+ return head;
+}
+
+static long queue_next(jitterbuf *jb)
+{
+ if (jb->frames)
+ return jb->frames->ts;
+ else
+ return -1;
+}
+
+static long queue_last(jitterbuf *jb)
+{
+ if (jb->frames)
+ return jb->frames->prev->ts;
+ else
+ return -1;
+}
+
+static jb_frame *_queue_get(jitterbuf *jb, long ts, int all)
+{
+ jb_frame *frame;
+ frame = jb->frames;
+
+ if (!frame)
+ return NULL;
+
+ /*jb_warn("queue_get: ASK %ld FIRST %ld\n", ts, frame->ts); */
+
+ if (all || ts >= frame->ts) {
+ /* remove this frame */
+ frame->prev->next = frame->next;
+ frame->next->prev = frame->prev;
+
+ if (frame->next == frame)
+ jb->frames = NULL;
+ else
+ jb->frames = frame->next;
+
+
+ /* insert onto "free" single-linked list */
+ frame->next = jb->free;
+ jb->free = frame;
+
+ jb->info.frames_cur--;
+
+ /* we return the frame pointer, even though it's on free list,
+ * but caller must copy data */
+ return frame;
+ }
+
+ return NULL;
+}
+
+static jb_frame *queue_get(jitterbuf *jb, long ts)
+{
+ return _queue_get(jb,ts,0);
+}
+
+static jb_frame *queue_getall(jitterbuf *jb)
+{
+ return _queue_get(jb,0,1);
+}
+
+#if 0
+/* some diagnostics */
+static void jb_dbginfo(jitterbuf *jb)
+{
+ if (dbgf == NULL)
+ return;
+
+ jb_dbg("\njb info: fin=%ld fout=%ld flate=%ld flost=%ld fdrop=%ld fcur=%ld\n",
+ jb->info.frames_in, jb->info.frames_out, jb->info.frames_late, jb->info.frames_lost, jb->info.frames_dropped, jb->info.frames_cur);
+
+ jb_dbg("jitter=%ld current=%ld target=%ld min=%ld sil=%d len=%d len/fcur=%ld\n",
+ jb->info.jitter, jb->info.current, jb->info.target, jb->info.min, jb->info.silence_begin_ts, jb->info.current - jb->info.min,
+ jb->info.frames_cur ? (jb->info.current - jb->info.min)/jb->info.frames_cur : -8);
+ if (jb->info.frames_in > 0)
+ jb_dbg("jb info: Loss PCT = %ld%%, Late PCT = %ld%%\n",
+ jb->info.frames_lost * 100/(jb->info.frames_in + jb->info.frames_lost),
+ jb->info.frames_late * 100/jb->info.frames_in);
+ jb_dbg("jb info: queue %d -> %d. last_ts %d (queue len: %d) last_ms %d\n",
+ queue_next(jb),
+ queue_last(jb),
+ jb->info.next_voice_ts,
+ queue_last(jb) - queue_next(jb),
+ jb->info.last_voice_ms);
+}
+#endif
+
+#ifdef DEEP_DEBUG
+static void jb_chkqueue(jitterbuf *jb)
+{
+ int i=0;
+ jb_frame *p = jb->frames;
+
+ if (!p) {
+ return;
+ }
+
+ do {
+ if (p->next == NULL) {
+ jb_err("Queue is BROKEN at item [%d]", i);
+ }
+ i++;
+ p=p->next;
+ } while (p->next != jb->frames);
+}
+
+static void jb_dbgqueue(jitterbuf *jb)
+{
+ int i=0;
+ jb_frame *p = jb->frames;
+
+ jb_dbg("queue: ");
+
+ if (!p) {
+ jb_dbg("EMPTY\n");
+ return;
+ }
+
+ do {
+ jb_dbg("[%d]=%ld ", i++, p->ts);
+ p=p->next;
+ } while (p->next != jb->frames);
+
+ jb_dbg("\n");
+}
+#endif
+
+enum jb_return_code jb_put(jitterbuf *jb, void *data, const enum jb_frame_type type, long ms, long ts, long now)
+{
+ long numts;
+
+ jb_dbg2("jb_put(%x,%x,%ld,%ld,%ld)\n", jb, data, ms, ts, now);
+
+ jb->info.frames_in++;
+
+ if (jb->frames && jb->dropem)
+ return JB_DROP;
+ jb->dropem = 0;
+
+ if (type == JB_TYPE_VOICE) {
+ /* presently, I'm only adding VOICE frames to history and drift calculations; mostly because with the
+ * IAX integrations, I'm sending retransmitted control frames with their awkward timestamps through */
+ if (history_put(jb,ts,now,ms))
+ return JB_DROP;
+ }
+ numts = 0;
+ if (jb->frames)
+ numts = jb->frames->prev->ts - jb->frames->ts;
+ if (numts >= jb->info.conf.max_jitterbuf) {
+ ast_log(LOG_DEBUG, "Attempting to exceed Jitterbuf max %ld timeslots\n",
+ jb->info.conf.max_jitterbuf);
+ jb->dropem = 1;
+ return JB_DROP;
+ }
+ /* if put into head of queue, caller needs to reschedule */
+ if (queue_put(jb,data,type,ms,ts)) {
+ return JB_SCHED;
+ }
+ return JB_OK;
+}
+
+
+static enum jb_return_code _jb_get(jitterbuf *jb, jb_frame *frameout, long now, long interpl)
+{
+ jb_frame *frame;
+ long diff;
+ static int dbg_cnt = 0;
+
+ /*if ((now - jb_next(jb)) > 2 * jb->info.last_voice_ms) jb_warn("SCHED: %ld", (now - jb_next(jb))); */
+ /* get jitter info */
+ history_get(jb);
+
+ if (dbg_cnt && dbg_cnt % 50 == 0) {
+ jb_dbg("\n");
+ }
+ dbg_cnt++;
+
+ /* target */
+ jb->info.target = jb->info.jitter + jb->info.min + JB_TARGET_EXTRA;
+
+ /* if a hard clamp was requested, use it */
+ if ((jb->info.conf.max_jitterbuf) && ((jb->info.target - jb->info.min) > jb->info.conf.max_jitterbuf)) {
+ jb_dbg("clamping target from %ld to %ld\n", (jb->info.target - jb->info.min), jb->info.conf.max_jitterbuf);
+ jb->info.target = jb->info.min + jb->info.conf.max_jitterbuf;
+ }
+
+ diff = jb->info.target - jb->info.current;
+
+ /* jb_warn("diff = %d lms=%d last = %d now = %d\n", diff, */
+ /* jb->info.last_voice_ms, jb->info.last_adjustment, now); */
+
+ /* let's work on non-silent case first */
+ if (!jb->info.silence_begin_ts) {
+ /* we want to grow */
+ if ((diff > 0) &&
+ /* we haven't grown in the delay length */
+ (((jb->info.last_adjustment + JB_ADJUST_DELAY) < now) ||
+ /* we need to grow more than the "length" we have left */
+ (diff > queue_last(jb) - queue_next(jb)) ) ) {
+ /* grow by interp frame length */
+ jb->info.current += interpl;
+ jb->info.next_voice_ts += interpl;
+ jb->info.last_voice_ms = interpl;
+ jb->info.last_adjustment = now;
+ jb->info.cnt_contig_interp++;
+ if (jb->info.conf.max_contig_interp && jb->info.cnt_contig_interp >= jb->info.conf.max_contig_interp) {
+ jb->info.silence_begin_ts = jb->info.next_voice_ts - jb->info.current;
+ }
+ jb_dbg("G");
+ return JB_INTERP;
+ }
+
+ frame = queue_get(jb, jb->info.next_voice_ts - jb->info.current);
+
+ /* not a voice frame; just return it. */
+ if (frame && frame->type != JB_TYPE_VOICE) {
+ if (frame->type == JB_TYPE_SILENCE) {
+ jb->info.silence_begin_ts = frame->ts;
+ jb->info.cnt_contig_interp = 0;
+ }
+
+ *frameout = *frame;
+ jb->info.frames_out++;
+ jb_dbg("o");
+ return JB_OK;
+ }
+
+
+ /* voice frame is later than expected */
+ if (frame && frame->ts + jb->info.current < jb->info.next_voice_ts) {
+ if (frame->ts + jb->info.current > jb->info.next_voice_ts - jb->info.last_voice_ms) {
+ /* either we interpolated past this frame in the last jb_get */
+ /* or the frame is still in order, but came a little too quick */
+ *frameout = *frame;
+ /* reset expectation for next frame */
+ jb->info.next_voice_ts = frame->ts + jb->info.current + frame->ms;
+ jb->info.frames_out++;
+ decrement_losspct(jb);
+ jb->info.cnt_contig_interp = 0;
+ jb_dbg("v");
+ return JB_OK;
+ } else {
+ /* voice frame is late */
+ *frameout = *frame;
+ jb->info.frames_out++;
+ decrement_losspct(jb);
+ jb->info.frames_late++;
+ jb->info.frames_lost--;
+ jb_dbg("l");
+ /*jb_warn("\nlate: wanted=%ld, this=%ld, next=%ld\n", jb->info.next_voice_ts - jb->info.current, frame->ts, queue_next(jb));
+ jb_warninfo(jb); */
+ return JB_DROP;
+ }
+ }
+
+ /* keep track of frame sizes, to allow for variable sized-frames */
+ if (frame && frame->ms > 0) {
+ jb->info.last_voice_ms = frame->ms;
+ }
+
+ /* we want to shrink; shrink at 1 frame / 500ms */
+ /* unless we don't have a frame, then shrink 1 frame */
+ /* every 80ms (though perhaps we can shrink even faster */
+ /* in this case) */
+ if (diff < -JB_TARGET_EXTRA &&
+ ((!frame && jb->info.last_adjustment + 80 < now) ||
+ (jb->info.last_adjustment + 500 < now))) {
+
+ jb->info.last_adjustment = now;
+ jb->info.cnt_contig_interp = 0;
+
+ if (frame) {
+ *frameout = *frame;
+ /* shrink by frame size we're throwing out */
+ jb->info.current -= frame->ms;
+ jb->info.frames_out++;
+ decrement_losspct(jb);
+ jb->info.frames_dropped++;
+ jb_dbg("s");
+ return JB_DROP;
+ } else {
+ /* shrink by last_voice_ms */
+ jb->info.current -= jb->info.last_voice_ms;
+ jb->info.frames_lost++;
+ increment_losspct(jb);
+ jb_dbg("S");
+ return JB_NOFRAME;
+ }
+ }
+
+ /* lost frame */
+ if (!frame) {
+ /* this is a bit of a hack for now, but if we're close to
+ * target, and we find a missing frame, it makes sense to
+ * grow, because the frame might just be a bit late;
+ * otherwise, we presently get into a pattern where we return
+ * INTERP for the lost frame, then it shows up next, and we
+ * throw it away because it's late */
+ /* I've recently only been able to replicate this using
+ * iaxclient talking to app_echo on asterisk. In this case,
+ * my outgoing packets go through asterisk's (old)
+ * jitterbuffer, and then might get an unusual increasing delay
+ * there if it decides to grow?? */
+ /* Update: that might have been a different bug, that has been fixed..
+ * But, this still seemed like a good idea, except that it ended up making a single actual
+ * lost frame get interpolated two or more times, when there was "room" to grow, so it might
+ * be a bit of a bad idea overall */
+ /*if (diff > -1 * jb->info.last_voice_ms) {
+ jb->info.current += jb->info.last_voice_ms;
+ jb->info.last_adjustment = now;
+ jb_warn("g");
+ return JB_INTERP;
+ } */
+ jb->info.frames_lost++;
+ increment_losspct(jb);
+ jb->info.next_voice_ts += interpl;
+ jb->info.last_voice_ms = interpl;
+ jb->info.cnt_contig_interp++;
+ if (jb->info.conf.max_contig_interp && jb->info.cnt_contig_interp >= jb->info.conf.max_contig_interp) {
+ jb->info.silence_begin_ts = jb->info.next_voice_ts - jb->info.current;
+ }
+ jb_dbg("L");
+ return JB_INTERP;
+ }
+
+ /* normal case; return the frame, increment stuff */
+ *frameout = *frame;
+ jb->info.next_voice_ts += frame->ms;
+ jb->info.frames_out++;
+ jb->info.cnt_contig_interp = 0;
+ decrement_losspct(jb);
+ jb_dbg("v");
+ return JB_OK;
+ } else {
+ /* TODO: after we get the non-silent case down, we'll make the
+ * silent case -- basically, we'll just grow and shrink faster
+ * here, plus handle next_voice_ts a bit differently */
+
+ /* to disable silent special case altogether, just uncomment this: */
+ /* jb->info.silence_begin_ts = 0; */
+
+ /* shrink interpl len every 10ms during silence */
+ if (diff < -JB_TARGET_EXTRA &&
+ jb->info.last_adjustment + 10 <= now) {
+ jb->info.current -= interpl;
+ jb->info.last_adjustment = now;
+ }
+
+ frame = queue_get(jb, now - jb->info.current);
+ if (!frame) {
+ return JB_NOFRAME;
+ } else if (frame->type != JB_TYPE_VOICE) {
+ /* normal case; in silent mode, got a non-voice frame */
+ *frameout = *frame;
+ jb->info.frames_out++;
+ return JB_OK;
+ }
+ if (frame->ts < jb->info.silence_begin_ts) {
+ /* voice frame is late */
+ *frameout = *frame;
+ jb->info.frames_out++;
+ decrement_losspct(jb);
+ jb->info.frames_late++;
+ jb->info.frames_lost--;
+ jb_dbg("l");
+ /*jb_warn("\nlate: wanted=%ld, this=%ld, next=%ld\n", jb->info.next_voice_ts - jb->info.current, frame->ts, queue_next(jb));
+ jb_warninfo(jb); */
+ return JB_DROP;
+ } else {
+ /* voice frame */
+ /* try setting current to target right away here */
+ jb->info.current = jb->info.target;
+ jb->info.silence_begin_ts = 0;
+ jb->info.next_voice_ts = frame->ts + jb->info.current + frame->ms;
+ jb->info.last_voice_ms = frame->ms;
+ jb->info.frames_out++;
+ decrement_losspct(jb);
+ *frameout = *frame;
+ jb_dbg("V");
+ return JB_OK;
+ }
+ }
+}
+
+long jb_next(jitterbuf *jb)
+{
+ if (jb->info.silence_begin_ts) {
+ if (jb->frames) {
+ long next = queue_next(jb);
+ history_get(jb);
+ /* shrink during silence */
+ if (jb->info.target - jb->info.current < -JB_TARGET_EXTRA)
+ return jb->info.last_adjustment + 10;
+ return next + jb->info.target;
+ }
+ else
+ return JB_LONGMAX;
+ } else {
+ return jb->info.next_voice_ts;
+ }
+}
+
+enum jb_return_code jb_get(jitterbuf *jb, jb_frame *frameout, long now, long interpl)
+{
+ enum jb_return_code ret = _jb_get(jb, frameout, now, interpl);
+#if 0
+ static int lastts=0;
+ int thists = ((ret == JB_OK) || (ret == JB_DROP)) ? frameout->ts : 0;
+ jb_warn("jb_get(%x,%x,%ld) = %d (%d)\n", jb, frameout, now, ret, thists);
+ if (thists && thists < lastts) jb_warn("XXXX timestamp roll-back!!!\n");
+ lastts = thists;
+#endif
+ if(ret == JB_INTERP)
+ frameout->ms = jb->info.last_voice_ms;
+
+ return ret;
+}
+
+enum jb_return_code jb_getall(jitterbuf *jb, jb_frame *frameout)
+{
+ jb_frame *frame;
+ frame = queue_getall(jb);
+
+ if (!frame) {
+ return JB_NOFRAME;
+ }
+
+ *frameout = *frame;
+ return JB_OK;
+}
+
+
+enum jb_return_code jb_getinfo(jitterbuf *jb, jb_info *stats)
+{
+
+ history_get(jb);
+
+ *stats = jb->info;
+
+ return JB_OK;
+}
+
+enum jb_return_code jb_setconf(jitterbuf *jb, jb_conf *conf)
+{
+ /* take selected settings from the struct */
+
+ jb->info.conf.max_jitterbuf = conf->max_jitterbuf;
+ jb->info.conf.resync_threshold = conf->resync_threshold;
+ jb->info.conf.max_contig_interp = conf->max_contig_interp;
+
+ return JB_OK;
+}
+
+