#include "asterisk.h"
#include "jitterbuf.h"
#include "asterisk/utils.h"
Go to the source code of this file.
Defines | |
#define | jb_dbg() (dbgf ? dbgf(__VA_ARGS__) : (void)0) |
#define | jb_dbg2() ((void)0) |
#define | jb_err() (errf ? errf(__VA_ARGS__) : (void)0) |
#define | JB_LONGMAX 2147483647L |
#define | JB_LONGMIN (-JB_LONGMAX - 1L) |
#define | jb_warn() (warnf ? warnf(__VA_ARGS__) : (void)0) |
Functions | |
static enum jb_return_code | _jb_get (jitterbuf *jb, jb_frame *frameout, long now, long interpl) |
static jb_frame * | _queue_get (jitterbuf *jb, long ts, int all) |
static void | decrement_losspct (jitterbuf *jb) |
static void | history_calc_maxbuf (jitterbuf *jb) |
static void | history_get (jitterbuf *jb) |
static int | history_put (jitterbuf *jb, long ts, long now, long ms) |
simple history manipulation | |
static void | increment_losspct (jitterbuf *jb) |
void | jb_destroy (jitterbuf *jb) |
destroy jitterbuf | |
enum jb_return_code | jb_get (jitterbuf *jb, jb_frame *frameout, long now, long interpl) |
get a frame for time now (receiver's time) return value is one of JB_OK: You've got frame! JB_DROP: Here's an audio frame you should just drop. Ask me again for this time.. JB_NOFRAME: There's no frame scheduled for this time. JB_INTERP: Please interpolate an interpl-length frame for this time (either we need to grow, or there was a lost frame) JB_EMPTY: The jb is empty. | |
enum jb_return_code | jb_getall (jitterbuf *jb, jb_frame *frameout) |
unconditionally get frames from jitterbuf until empty | |
enum jb_return_code | jb_getinfo (jitterbuf *jb, jb_info *stats) |
get jitterbuf info: only "statistics" may be valid | |
jitterbuf * | jb_new () |
new jitterbuf | |
long | jb_next (jitterbuf *jb) |
when is the next frame due out, in receiver's time (0=EMPTY) This value may change as frames are added (esp non-audio frames) | |
enum jb_return_code | jb_put (jitterbuf *jb, void *data, const enum jb_frame_type type, long ms, long ts, long now) |
queue a frame | |
void | jb_reset (jitterbuf *jb) |
reset jitterbuf | |
enum jb_return_code | jb_setconf (jitterbuf *jb, jb_conf *conf) |
set jitterbuf conf | |
void | jb_setoutput (jb_output_function_t err, jb_output_function_t warn, jb_output_function_t dbg) |
static jb_frame * | queue_get (jitterbuf *jb, long ts) |
static jb_frame * | queue_getall (jitterbuf *jb) |
static long | queue_last (jitterbuf *jb) |
static long | queue_next (jitterbuf *jb) |
static int | queue_put (jitterbuf *jb, void *data, const enum jb_frame_type type, long ms, long ts) |
Variables | |
static jb_output_function_t | dbgf |
static jb_output_function_t | errf |
static jb_output_function_t | warnf |
Definition in file jitterbuf.c.
#define jb_dbg2 | ( | ) | ((void)0) |
#define JB_LONGMAX 2147483647L |
define these here, just for ancient compiler systems
Definition at line 38 of file jitterbuf.c.
Referenced by history_calc_maxbuf(), and jb_next().
#define JB_LONGMIN (-JB_LONGMAX - 1L) |
static enum jb_return_code _jb_get | ( | jitterbuf * | jb, | |
jb_frame * | frameout, | |||
long | now, | |||
long | interpl | |||
) | [static] |
Definition at line 548 of file jitterbuf.c.
References jb_info::cnt_contig_interp, jb_info::conf, jb_info::current, decrement_losspct(), jb_info::frames_dropped, jb_info::frames_late, jb_info::frames_lost, jb_info::frames_out, history_get(), increment_losspct(), jitterbuf::info, JB_ADJUST_DELAY, jb_dbg, JB_DROP, JB_INTERP, JB_NOFRAME, JB_OK, JB_TYPE_SILENCE, JB_TYPE_VOICE, jb_info::jitter, jb_info::last_adjustment, jb_info::last_voice_ms, jb_conf::max_contig_interp, jb_conf::max_jitterbuf, jb_info::min, jb_frame::ms, jb_info::next_voice_ts, queue_get(), queue_last(), queue_next(), jb_info::silence_begin_ts, jb_info::target, jb_conf::target_extra, jb_frame::ts, and jb_frame::type.
Referenced by jb_get().
00549 { 00550 jb_frame *frame; 00551 long diff; 00552 static int dbg_cnt = 0; 00553 00554 /*if ((now - jb_next(jb)) > 2 * jb->info.last_voice_ms) jb_warn("SCHED: %ld", (now - jb_next(jb))); */ 00555 /* get jitter info */ 00556 history_get(jb); 00557 00558 if (dbg_cnt && dbg_cnt % 50 == 0) { 00559 jb_dbg("\n"); 00560 } 00561 dbg_cnt++; 00562 00563 /* target */ 00564 jb->info.target = jb->info.jitter + jb->info.min + jb->info.conf.target_extra; 00565 00566 /* if a hard clamp was requested, use it */ 00567 if ((jb->info.conf.max_jitterbuf) && ((jb->info.target - jb->info.min) > jb->info.conf.max_jitterbuf)) { 00568 jb_dbg("clamping target from %ld to %ld\n", (jb->info.target - jb->info.min), jb->info.conf.max_jitterbuf); 00569 jb->info.target = jb->info.min + jb->info.conf.max_jitterbuf; 00570 } 00571 00572 diff = jb->info.target - jb->info.current; 00573 00574 /* jb_warn("diff = %d lms=%d last = %d now = %d\n", diff, */ 00575 /* jb->info.last_voice_ms, jb->info.last_adjustment, now); */ 00576 00577 /* let's work on non-silent case first */ 00578 if (!jb->info.silence_begin_ts) { 00579 /* we want to grow */ 00580 if ((diff > 0) && 00581 /* we haven't grown in the delay length */ 00582 (((jb->info.last_adjustment + JB_ADJUST_DELAY) < now) || 00583 /* we need to grow more than the "length" we have left */ 00584 (diff > queue_last(jb) - queue_next(jb)) ) ) { 00585 /* grow by interp frame length */ 00586 jb->info.current += interpl; 00587 jb->info.next_voice_ts += interpl; 00588 jb->info.last_voice_ms = interpl; 00589 jb->info.last_adjustment = now; 00590 jb->info.cnt_contig_interp++; 00591 if (jb->info.conf.max_contig_interp && jb->info.cnt_contig_interp >= jb->info.conf.max_contig_interp) { 00592 jb->info.silence_begin_ts = jb->info.next_voice_ts - jb->info.current; 00593 } 00594 jb_dbg("G"); 00595 return JB_INTERP; 00596 } 00597 00598 frame = queue_get(jb, jb->info.next_voice_ts - jb->info.current); 00599 00600 /* not a voice frame; just return it. */ 00601 if (frame && frame->type != JB_TYPE_VOICE) { 00602 if (frame->type == JB_TYPE_SILENCE) { 00603 jb->info.silence_begin_ts = frame->ts; 00604 jb->info.cnt_contig_interp = 0; 00605 } 00606 00607 *frameout = *frame; 00608 jb->info.frames_out++; 00609 jb_dbg("o"); 00610 return JB_OK; 00611 } 00612 00613 00614 /* voice frame is later than expected */ 00615 if (frame && frame->ts + jb->info.current < jb->info.next_voice_ts) { 00616 if (frame->ts + jb->info.current > jb->info.next_voice_ts - jb->info.last_voice_ms) { 00617 /* either we interpolated past this frame in the last jb_get */ 00618 /* or the frame is still in order, but came a little too quick */ 00619 *frameout = *frame; 00620 /* reset expectation for next frame */ 00621 jb->info.next_voice_ts = frame->ts + jb->info.current + frame->ms; 00622 jb->info.frames_out++; 00623 decrement_losspct(jb); 00624 jb->info.cnt_contig_interp = 0; 00625 jb_dbg("v"); 00626 return JB_OK; 00627 } else { 00628 /* voice frame is late */ 00629 *frameout = *frame; 00630 jb->info.frames_out++; 00631 decrement_losspct(jb); 00632 jb->info.frames_late++; 00633 jb->info.frames_lost--; 00634 jb_dbg("l"); 00635 /*jb_warn("\nlate: wanted=%ld, this=%ld, next=%ld\n", jb->info.next_voice_ts - jb->info.current, frame->ts, queue_next(jb)); 00636 jb_warninfo(jb); */ 00637 return JB_DROP; 00638 } 00639 } 00640 00641 /* keep track of frame sizes, to allow for variable sized-frames */ 00642 if (frame && frame->ms > 0) { 00643 jb->info.last_voice_ms = frame->ms; 00644 } 00645 00646 /* we want to shrink; shrink at 1 frame / 500ms */ 00647 /* unless we don't have a frame, then shrink 1 frame */ 00648 /* every 80ms (though perhaps we can shrink even faster */ 00649 /* in this case) */ 00650 if (diff < -jb->info.conf.target_extra && 00651 ((!frame && jb->info.last_adjustment + 80 < now) || 00652 (jb->info.last_adjustment + 500 < now))) { 00653 00654 jb->info.last_adjustment = now; 00655 jb->info.cnt_contig_interp = 0; 00656 00657 if (frame) { 00658 *frameout = *frame; 00659 /* shrink by frame size we're throwing out */ 00660 jb->info.current -= frame->ms; 00661 jb->info.frames_out++; 00662 decrement_losspct(jb); 00663 jb->info.frames_dropped++; 00664 jb_dbg("s"); 00665 return JB_DROP; 00666 } else { 00667 /* shrink by last_voice_ms */ 00668 jb->info.current -= jb->info.last_voice_ms; 00669 jb->info.frames_lost++; 00670 increment_losspct(jb); 00671 jb_dbg("S"); 00672 return JB_NOFRAME; 00673 } 00674 } 00675 00676 /* lost frame */ 00677 if (!frame) { 00678 /* this is a bit of a hack for now, but if we're close to 00679 * target, and we find a missing frame, it makes sense to 00680 * grow, because the frame might just be a bit late; 00681 * otherwise, we presently get into a pattern where we return 00682 * INTERP for the lost frame, then it shows up next, and we 00683 * throw it away because it's late */ 00684 /* I've recently only been able to replicate this using 00685 * iaxclient talking to app_echo on asterisk. In this case, 00686 * my outgoing packets go through asterisk's (old) 00687 * jitterbuffer, and then might get an unusual increasing delay 00688 * there if it decides to grow?? */ 00689 /* Update: that might have been a different bug, that has been fixed.. 00690 * But, this still seemed like a good idea, except that it ended up making a single actual 00691 * lost frame get interpolated two or more times, when there was "room" to grow, so it might 00692 * be a bit of a bad idea overall */ 00693 /*if (diff > -1 * jb->info.last_voice_ms) { 00694 jb->info.current += jb->info.last_voice_ms; 00695 jb->info.last_adjustment = now; 00696 jb_warn("g"); 00697 return JB_INTERP; 00698 } */ 00699 jb->info.frames_lost++; 00700 increment_losspct(jb); 00701 jb->info.next_voice_ts += interpl; 00702 jb->info.last_voice_ms = interpl; 00703 jb->info.cnt_contig_interp++; 00704 if (jb->info.conf.max_contig_interp && jb->info.cnt_contig_interp >= jb->info.conf.max_contig_interp) { 00705 jb->info.silence_begin_ts = jb->info.next_voice_ts - jb->info.current; 00706 } 00707 jb_dbg("L"); 00708 return JB_INTERP; 00709 } 00710 00711 /* normal case; return the frame, increment stuff */ 00712 *frameout = *frame; 00713 jb->info.next_voice_ts += frame->ms; 00714 jb->info.frames_out++; 00715 jb->info.cnt_contig_interp = 0; 00716 decrement_losspct(jb); 00717 jb_dbg("v"); 00718 return JB_OK; 00719 } else { 00720 /* TODO: after we get the non-silent case down, we'll make the 00721 * silent case -- basically, we'll just grow and shrink faster 00722 * here, plus handle next_voice_ts a bit differently */ 00723 00724 /* to disable silent special case altogether, just uncomment this: */ 00725 /* jb->info.silence_begin_ts = 0; */ 00726 00727 /* shrink interpl len every 10ms during silence */ 00728 if (diff < -jb->info.conf.target_extra && 00729 jb->info.last_adjustment + 10 <= now) { 00730 jb->info.current -= interpl; 00731 jb->info.last_adjustment = now; 00732 } 00733 00734 frame = queue_get(jb, now - jb->info.current); 00735 if (!frame) { 00736 return JB_NOFRAME; 00737 } else if (frame->type != JB_TYPE_VOICE) { 00738 /* normal case; in silent mode, got a non-voice frame */ 00739 *frameout = *frame; 00740 jb->info.frames_out++; 00741 return JB_OK; 00742 } 00743 if (frame->ts < jb->info.silence_begin_ts) { 00744 /* voice frame is late */ 00745 *frameout = *frame; 00746 jb->info.frames_out++; 00747 decrement_losspct(jb); 00748 jb->info.frames_late++; 00749 jb->info.frames_lost--; 00750 jb_dbg("l"); 00751 /*jb_warn("\nlate: wanted=%ld, this=%ld, next=%ld\n", jb->info.next_voice_ts - jb->info.current, frame->ts, queue_next(jb)); 00752 jb_warninfo(jb); */ 00753 return JB_DROP; 00754 } else { 00755 /* voice frame */ 00756 /* try setting current to target right away here */ 00757 jb->info.current = jb->info.target; 00758 jb->info.silence_begin_ts = 0; 00759 jb->info.next_voice_ts = frame->ts + jb->info.current + frame->ms; 00760 jb->info.last_voice_ms = frame->ms; 00761 jb->info.frames_out++; 00762 decrement_losspct(jb); 00763 *frameout = *frame; 00764 jb_dbg("V"); 00765 return JB_OK; 00766 } 00767 } 00768 }
Definition at line 396 of file jitterbuf.c.
References jitterbuf::frames, jb_info::frames_cur, jitterbuf::free, jitterbuf::info, jb_frame::next, jb_frame::prev, and jb_frame::ts.
Referenced by queue_get(), and queue_getall().
00397 { 00398 jb_frame *frame; 00399 frame = jb->frames; 00400 00401 if (!frame) 00402 return NULL; 00403 00404 /*jb_warn("queue_get: ASK %ld FIRST %ld\n", ts, frame->ts); */ 00405 00406 if (all || ts >= frame->ts) { 00407 /* remove this frame */ 00408 frame->prev->next = frame->next; 00409 frame->next->prev = frame->prev; 00410 00411 if (frame->next == frame) 00412 jb->frames = NULL; 00413 else 00414 jb->frames = frame->next; 00415 00416 00417 /* insert onto "free" single-linked list */ 00418 frame->next = jb->free; 00419 jb->free = frame; 00420 00421 jb->info.frames_cur--; 00422 00423 /* we return the frame pointer, even though it's on free list, 00424 * but caller must copy data */ 00425 return frame; 00426 } 00427 00428 return NULL; 00429 }
static void decrement_losspct | ( | jitterbuf * | jb | ) | [static] |
Definition at line 65 of file jitterbuf.c.
References jitterbuf::info, and jb_info::losspct.
Referenced by _jb_get().
static void history_calc_maxbuf | ( | jitterbuf * | jb | ) | [static] |
Definition at line 200 of file jitterbuf.c.
References jitterbuf::hist_maxbuf, jitterbuf::hist_minbuf, jitterbuf::hist_ptr, jitterbuf::history, JB_HISTORY_MAXBUF_SZ, JB_HISTORY_SZ, JB_LONGMAX, and JB_LONGMIN.
Referenced by history_get().
00201 { 00202 int i,j; 00203 00204 if (jb->hist_ptr == 0) 00205 return; 00206 00207 00208 /* initialize maxbuf/minbuf to the latest value */ 00209 for (i=0;i<JB_HISTORY_MAXBUF_SZ;i++) { 00210 /* 00211 * jb->hist_maxbuf[i] = jb->history[(jb->hist_ptr-1) % JB_HISTORY_SZ]; 00212 * jb->hist_minbuf[i] = jb->history[(jb->hist_ptr-1) % JB_HISTORY_SZ]; 00213 */ 00214 jb->hist_maxbuf[i] = JB_LONGMIN; 00215 jb->hist_minbuf[i] = JB_LONGMAX; 00216 } 00217 00218 /* use insertion sort to populate maxbuf */ 00219 /* we want it to be the top "n" values, in order */ 00220 00221 /* start at the beginning, or JB_HISTORY_SZ frames ago */ 00222 i = (jb->hist_ptr > JB_HISTORY_SZ) ? (jb->hist_ptr - JB_HISTORY_SZ) : 0; 00223 00224 for (;i<jb->hist_ptr;i++) { 00225 long toins = jb->history[i % JB_HISTORY_SZ]; 00226 00227 /* if the maxbuf should get this */ 00228 if (toins > jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1]) { 00229 00230 /* insertion-sort it into the maxbuf */ 00231 for (j=0;j<JB_HISTORY_MAXBUF_SZ;j++) { 00232 /* found where it fits */ 00233 if (toins > jb->hist_maxbuf[j]) { 00234 /* move over */ 00235 memmove(jb->hist_maxbuf + j + 1, jb->hist_maxbuf + j, (JB_HISTORY_MAXBUF_SZ - (j + 1)) * sizeof(jb->hist_maxbuf[0])); 00236 /* insert */ 00237 jb->hist_maxbuf[j] = toins; 00238 00239 break; 00240 } 00241 } 00242 } 00243 00244 /* if the minbuf should get this */ 00245 if (toins < jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1]) { 00246 00247 /* insertion-sort it into the maxbuf */ 00248 for (j=0;j<JB_HISTORY_MAXBUF_SZ;j++) { 00249 /* found where it fits */ 00250 if (toins < jb->hist_minbuf[j]) { 00251 /* move over */ 00252 memmove(jb->hist_minbuf + j + 1, jb->hist_minbuf + j, (JB_HISTORY_MAXBUF_SZ - (j + 1)) * sizeof(jb->hist_minbuf[0])); 00253 /* insert */ 00254 jb->hist_minbuf[j] = toins; 00255 00256 break; 00257 } 00258 } 00259 } 00260 00261 if (0) { 00262 int k; 00263 fprintf(stderr, "toins = %ld\n", toins); 00264 fprintf(stderr, "maxbuf ="); 00265 for (k=0;k<JB_HISTORY_MAXBUF_SZ;k++) 00266 fprintf(stderr, "%ld ", jb->hist_maxbuf[k]); 00267 fprintf(stderr, "\nminbuf ="); 00268 for (k=0;k<JB_HISTORY_MAXBUF_SZ;k++) 00269 fprintf(stderr, "%ld ", jb->hist_minbuf[k]); 00270 fprintf(stderr, "\n"); 00271 } 00272 } 00273 00274 jb->hist_maxbuf_valid = 1; 00275 }
static void history_get | ( | jitterbuf * | jb | ) | [static] |
Definition at line 277 of file jitterbuf.c.
References jitterbuf::hist_maxbuf, jitterbuf::hist_maxbuf_valid, jitterbuf::hist_minbuf, jitterbuf::hist_ptr, history_calc_maxbuf(), jitterbuf::info, JB_HISTORY_DROPPCT, JB_HISTORY_SZ, jb_info::jitter, and jb_info::min.
Referenced by _jb_get(), jb_getinfo(), and jb_next().
00278 { 00279 long max, min, jitter; 00280 int idx; 00281 int count; 00282 00283 if (!jb->hist_maxbuf_valid) 00284 history_calc_maxbuf(jb); 00285 00286 /* count is how many items in history we're examining */ 00287 count = (jb->hist_ptr < JB_HISTORY_SZ) ? jb->hist_ptr : JB_HISTORY_SZ; 00288 00289 /* idx is the "n"ths highest/lowest that we'll look for */ 00290 idx = count * JB_HISTORY_DROPPCT / 100; 00291 00292 /* sanity checks for idx */ 00293 if (idx > (JB_HISTORY_MAXBUF_SZ - 1)) 00294 idx = JB_HISTORY_MAXBUF_SZ - 1; 00295 00296 if (idx < 0) { 00297 jb->info.min = 0; 00298 jb->info.jitter = 0; 00299 return; 00300 } 00301 00302 max = jb->hist_maxbuf[idx]; 00303 min = jb->hist_minbuf[idx]; 00304 00305 jitter = max - min; 00306 00307 /* these debug stmts compare the difference between looking at the absolute jitter, and the 00308 * values we get by throwing away the outliers */ 00309 /* 00310 fprintf(stderr, "[%d] min=%d, max=%d, jitter=%d\n", index, min, max, jitter); 00311 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]); 00312 */ 00313 00314 jb->info.min = min; 00315 jb->info.jitter = jitter; 00316 }
static int history_put | ( | jitterbuf * | jb, | |
long | ts, | |||
long | now, | |||
long | ms | |||
) | [static] |
simple history manipulation
Definition at line 125 of file jitterbuf.c.
References jb_info::cnt_delay_discont, jb_info::conf, jitterbuf::hist_maxbuf, jitterbuf::hist_maxbuf_valid, jitterbuf::hist_ptr, jitterbuf::history, jitterbuf::info, JB_HISTORY_MAXBUF_SZ, JB_HISTORY_SZ, jb_warn, jb_info::jitter, jb_info::last_delay, jb_info::resync_offset, and jb_conf::resync_threshold.
Referenced by jb_put().
00126 { 00127 long delay = now - (ts - jb->info.resync_offset); 00128 long threshold = 2 * jb->info.jitter + jb->info.conf.resync_threshold; 00129 long kicked; 00130 00131 /* don't add special/negative times to history */ 00132 if (ts <= 0) 00133 return 0; 00134 00135 /* check for drastic change in delay */ 00136 if (jb->info.conf.resync_threshold != -1) { 00137 if (abs(delay - jb->info.last_delay) > threshold) { 00138 jb->info.cnt_delay_discont++; 00139 if (jb->info.cnt_delay_discont > 3) { 00140 /* resync the jitterbuffer */ 00141 jb->info.cnt_delay_discont = 0; 00142 jb->hist_ptr = 0; 00143 jb->hist_maxbuf_valid = 0; 00144 00145 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); 00146 jb->info.resync_offset = ts - now; 00147 jb->info.last_delay = delay = 0; /* after resync, frame is right on time */ 00148 } else { 00149 return -1; 00150 } 00151 } else { 00152 jb->info.last_delay = delay; 00153 jb->info.cnt_delay_discont = 0; 00154 } 00155 } 00156 00157 kicked = jb->history[jb->hist_ptr % JB_HISTORY_SZ]; 00158 00159 jb->history[(jb->hist_ptr++) % JB_HISTORY_SZ] = delay; 00160 00161 /* optimization; the max/min buffers don't need to be recalculated, if this packet's 00162 * entry doesn't change them. This happens if this packet is not involved, _and_ any packet 00163 * that got kicked out of the history is also not involved 00164 * We do a number of comparisons, but it's probably still worthwhile, because it will usually 00165 * succeed, and should be a lot faster than going through all 500 packets in history */ 00166 if (!jb->hist_maxbuf_valid) 00167 return 0; 00168 00169 /* don't do this until we've filled history 00170 * (reduces some edge cases below) */ 00171 if (jb->hist_ptr < JB_HISTORY_SZ) 00172 goto invalidate; 00173 00174 /* if the new delay would go into min */ 00175 if (delay < jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1]) 00176 goto invalidate; 00177 00178 /* or max.. */ 00179 if (delay > jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1]) 00180 goto invalidate; 00181 00182 /* or the kicked delay would be in min */ 00183 if (kicked <= jb->hist_minbuf[JB_HISTORY_MAXBUF_SZ-1]) 00184 goto invalidate; 00185 00186 if (kicked >= jb->hist_maxbuf[JB_HISTORY_MAXBUF_SZ-1]) 00187 goto invalidate; 00188 00189 /* if we got here, we don't need to invalidate, 'cause this delay didn't 00190 * affect things */ 00191 return 0; 00192 /* end optimization */ 00193 00194 00195 invalidate: 00196 jb->hist_maxbuf_valid = 0; 00197 return 0; 00198 }
static void increment_losspct | ( | jitterbuf * | jb | ) | [static] |
Definition at line 60 of file jitterbuf.c.
References jitterbuf::info, and jb_info::losspct.
Referenced by _jb_get().
void jb_destroy | ( | jitterbuf * | jb | ) |
destroy jitterbuf
Definition at line 95 of file jitterbuf.c.
References ast_free, jitterbuf::free, jb_dbg2, and jb_frame::next.
Referenced by jb_destroy_adaptive(), and pvt_destructor().
00096 { 00097 jb_frame *frame; 00098 jb_dbg2("jb_destroy(%x)\n", jb); 00099 00100 /* free all the frames on the "free list" */ 00101 frame = jb->free; 00102 while (frame != NULL) { 00103 jb_frame *next = frame->next; 00104 ast_free(frame); 00105 frame = next; 00106 } 00107 00108 /* free ourselves! */ 00109 ast_free(jb); 00110 }
enum jb_return_code jb_get | ( | jitterbuf * | jb, | |
jb_frame * | frameout, | |||
long | now, | |||
long | interpl | |||
) |
get a frame for time now (receiver's time) return value is one of JB_OK: You've got frame! JB_DROP: Here's an audio frame you should just drop. Ask me again for this time.. JB_NOFRAME: There's no frame scheduled for this time. JB_INTERP: Please interpolate an interpl-length frame for this time (either we need to grow, or there was a lost frame) JB_EMPTY: The jb is empty.
Definition at line 788 of file jitterbuf.c.
References _jb_get(), jitterbuf::info, JB_DROP, JB_INTERP, JB_OK, jb_warn, jb_info::last_voice_ms, jb_frame::ms, and jb_frame::ts.
Referenced by __get_from_jb(), and jb_get_adaptive().
00789 { 00790 enum jb_return_code ret = _jb_get(jb, frameout, now, interpl); 00791 #if 0 00792 static int lastts=0; 00793 int thists = ((ret == JB_OK) || (ret == JB_DROP)) ? frameout->ts : 0; 00794 jb_warn("jb_get(%x,%x,%ld) = %d (%d)\n", jb, frameout, now, ret, thists); 00795 if (thists && thists < lastts) jb_warn("XXXX timestamp roll-back!!!\n"); 00796 lastts = thists; 00797 #endif 00798 if (ret == JB_INTERP) 00799 frameout->ms = jb->info.last_voice_ms; 00800 00801 return ret; 00802 }
enum jb_return_code jb_getall | ( | jitterbuf * | jb, | |
jb_frame * | frameout | |||
) |
unconditionally get frames from jitterbuf until empty
Definition at line 804 of file jitterbuf.c.
References JB_NOFRAME, JB_OK, and queue_getall().
Referenced by complete_transfer(), jb_empty_and_reset_adaptive(), jb_remove_adaptive(), pvt_destructor(), and schedule_delivery().
00805 { 00806 jb_frame *frame; 00807 frame = queue_getall(jb); 00808 00809 if (!frame) { 00810 return JB_NOFRAME; 00811 } 00812 00813 *frameout = *frame; 00814 return JB_OK; 00815 }
enum jb_return_code jb_getinfo | ( | jitterbuf * | jb, | |
jb_info * | stats | |||
) |
get jitterbuf info: only "statistics" may be valid
Definition at line 818 of file jitterbuf.c.
References history_get(), jitterbuf::info, and JB_OK.
Referenced by ast_cli_netstats(), construct_rr(), handle_cli_iax2_show_channels(), and log_jitterstats().
00819 { 00820 00821 history_get(jb); 00822 00823 *stats = jb->info; 00824 00825 return JB_OK; 00826 }
jitterbuf* jb_new | ( | void | ) |
new jitterbuf
Definition at line 82 of file jitterbuf.c.
References ast_malloc, jb_dbg2, and jb_reset().
Referenced by jb_create_adaptive(), and new_iax().
00083 { 00084 jitterbuf *jb; 00085 00086 if (!(jb = ast_malloc(sizeof(*jb)))) 00087 return NULL; 00088 00089 jb_reset(jb); 00090 00091 jb_dbg2("jb_new() = %x\n", jb); 00092 return jb; 00093 }
long jb_next | ( | jitterbuf * | jb | ) |
when is the next frame due out, in receiver's time (0=EMPTY) This value may change as frames are added (esp non-audio frames)
Definition at line 770 of file jitterbuf.c.
References jb_info::conf, jb_info::current, jitterbuf::frames, history_get(), jitterbuf::info, JB_LONGMAX, jb_info::last_adjustment, jb_info::next_voice_ts, queue_next(), jb_info::silence_begin_ts, jb_info::target, and jb_conf::target_extra.
Referenced by __get_from_jb(), jb_next_adaptive(), and update_jbsched().
00771 { 00772 if (jb->info.silence_begin_ts) { 00773 if (jb->frames) { 00774 long next = queue_next(jb); 00775 history_get(jb); 00776 /* shrink during silence */ 00777 if (jb->info.target - jb->info.current < -jb->info.conf.target_extra) 00778 return jb->info.last_adjustment + 10; 00779 return next + jb->info.target; 00780 } 00781 else 00782 return JB_LONGMAX; 00783 } else { 00784 return jb->info.next_voice_ts; 00785 } 00786 }
enum jb_return_code jb_put | ( | jitterbuf * | jb, | |
void * | data, | |||
const enum jb_frame_type | type, | |||
long | ms, | |||
long | ts, | |||
long | now | |||
) |
queue a frame
data=frame data, timings (in ms): ms=length of frame (for voice), ts=ts (sender's time) now=now (in receiver's time) return value is one of JB_OK: Frame added. Last call to jb_next() still valid JB_DROP: Drop this frame immediately JB_SCHED: Frame added. Call jb_next() to get a new time for the next frame
Definition at line 507 of file jitterbuf.c.
References ast_debug, jb_info::conf, jitterbuf::dropem, jitterbuf::frames, jb_info::frames_dropped, jb_info::frames_in, history_put(), jitterbuf::info, jb_dbg2, JB_DROP, JB_OK, JB_SCHED, JB_TYPE_VOICE, jb_conf::max_jitterbuf, jb_frame::prev, queue_put(), and jb_frame::ts.
Referenced by jb_put_adaptive(), and schedule_delivery().
00508 { 00509 long numts; 00510 00511 jb_dbg2("jb_put(%x,%x,%ld,%ld,%ld)\n", jb, data, ms, ts, now); 00512 00513 numts = 0; 00514 if (jb->frames) 00515 numts = jb->frames->prev->ts - jb->frames->ts; 00516 00517 if (numts >= jb->info.conf.max_jitterbuf) { 00518 if (!jb->dropem) { 00519 ast_debug(1, "Attempting to exceed Jitterbuf max %ld timeslots\n", 00520 jb->info.conf.max_jitterbuf); 00521 jb->dropem = 1; 00522 } 00523 jb->info.frames_dropped++; 00524 return JB_DROP; 00525 } else { 00526 jb->dropem = 0; 00527 } 00528 00529 if (type == JB_TYPE_VOICE) { 00530 /* presently, I'm only adding VOICE frames to history and drift calculations; mostly because with the 00531 * IAX integrations, I'm sending retransmitted control frames with their awkward timestamps through */ 00532 if (history_put(jb,ts,now,ms)) { 00533 jb->info.frames_dropped++; 00534 return JB_DROP; 00535 } 00536 } 00537 00538 jb->info.frames_in++; 00539 00540 /* if put into head of queue, caller needs to reschedule */ 00541 if (queue_put(jb,data,type,ms,ts)) { 00542 return JB_SCHED; 00543 } 00544 return JB_OK; 00545 }
void jb_reset | ( | jitterbuf * | jb | ) |
reset jitterbuf
Definition at line 70 of file jitterbuf.c.
References jb_info::conf, jitterbuf::info, JB_TARGET_EXTRA, and s.
Referenced by complete_transfer(), jb_empty_and_reset_adaptive(), jb_new(), and schedule_delivery().
00071 { 00072 /* only save settings */ 00073 jb_conf s = jb->info.conf; 00074 memset(jb, 0, sizeof(*jb)); 00075 jb->info.conf = s; 00076 00077 /* initialize length, using the default value */ 00078 jb->info.current = jb->info.target = jb->info.conf.target_extra = JB_TARGET_EXTRA; 00079 jb->info.silence_begin_ts = -1; 00080 }
enum jb_return_code jb_setconf | ( | jitterbuf * | jb, | |
jb_conf * | conf | |||
) |
set jitterbuf conf
Definition at line 828 of file jitterbuf.c.
References jb_info::conf, jb_info::current, jitterbuf::info, JB_OK, JB_TARGET_EXTRA, jb_conf::max_contig_interp, jb_conf::max_jitterbuf, jb_conf::resync_threshold, jb_info::target, and jb_conf::target_extra.
Referenced by jb_create_adaptive(), and new_iax().
00829 { 00830 /* take selected settings from the struct */ 00831 00832 jb->info.conf.max_jitterbuf = conf->max_jitterbuf; 00833 jb->info.conf.resync_threshold = conf->resync_threshold; 00834 jb->info.conf.max_contig_interp = conf->max_contig_interp; 00835 00836 /* -1 indicates use of the default JB_TARGET_EXTRA value */ 00837 jb->info.conf.target_extra = ( conf->target_extra == -1 ) 00838 ? JB_TARGET_EXTRA 00839 : conf->target_extra 00840 ; 00841 00842 /* update these to match new target_extra setting */ 00843 jb->info.current = jb->info.conf.target_extra; 00844 jb->info.target = jb->info.conf.target_extra; 00845 00846 return JB_OK; 00847 }
void jb_setoutput | ( | jb_output_function_t | err, | |
jb_output_function_t | warn, | |||
jb_output_function_t | dbg | |||
) |
Definition at line 53 of file jitterbuf.c.
Referenced by handle_cli_iax2_set_debug_jb(), and load_module().
Definition at line 431 of file jitterbuf.c.
References _queue_get().
Referenced by _jb_get().
00432 { 00433 return _queue_get(jb,ts,0); 00434 }
Definition at line 436 of file jitterbuf.c.
References _queue_get().
Referenced by jb_getall().
00437 { 00438 return _queue_get(jb,0,1); 00439 }
static long queue_last | ( | jitterbuf * | jb | ) | [static] |
Definition at line 388 of file jitterbuf.c.
References jitterbuf::frames, jb_frame::prev, and jb_frame::ts.
Referenced by _jb_get().
00389 { 00390 if (jb->frames) 00391 return jb->frames->prev->ts; 00392 else 00393 return -1; 00394 }
static long queue_next | ( | jitterbuf * | jb | ) | [static] |
Definition at line 380 of file jitterbuf.c.
References jitterbuf::frames, and jb_frame::ts.
Referenced by _jb_get(), and jb_next().
static int queue_put | ( | jitterbuf * | jb, | |
void * | data, | |||
const enum jb_frame_type | type, | |||
long | ms, | |||
long | ts | |||
) | [static] |
Definition at line 319 of file jitterbuf.c.
References ast_malloc, frames, jitterbuf::frames, jb_info::frames_cur, jb_info::frames_ooo, jitterbuf::free, jitterbuf::info, jb_err, jb_frame::next, jb_frame::prev, and jb_info::resync_offset.
Referenced by jb_put().
00320 { 00321 jb_frame *frame; 00322 jb_frame *p; 00323 int head = 0; 00324 long resync_ts = ts - jb->info.resync_offset; 00325 00326 if ((frame = jb->free)) { 00327 jb->free = frame->next; 00328 } else if (!(frame = ast_malloc(sizeof(*frame)))) { 00329 jb_err("cannot allocate frame\n"); 00330 return 0; 00331 } 00332 00333 jb->info.frames_cur++; 00334 00335 frame->data = data; 00336 frame->ts = resync_ts; 00337 frame->ms = ms; 00338 frame->type = type; 00339 00340 /* 00341 * frames are a circular list, jb-frames points to to the lowest ts, 00342 * jb->frames->prev points to the highest ts 00343 */ 00344 00345 if (!jb->frames) { /* queue is empty */ 00346 jb->frames = frame; 00347 frame->next = frame; 00348 frame->prev = frame; 00349 head = 1; 00350 } else if (resync_ts < jb->frames->ts) { 00351 frame->next = jb->frames; 00352 frame->prev = jb->frames->prev; 00353 00354 frame->next->prev = frame; 00355 frame->prev->next = frame; 00356 00357 /* frame is out of order */ 00358 jb->info.frames_ooo++; 00359 00360 jb->frames = frame; 00361 head = 1; 00362 } else { 00363 p = jb->frames; 00364 00365 /* frame is out of order */ 00366 if (resync_ts < p->prev->ts) jb->info.frames_ooo++; 00367 00368 while (resync_ts < p->prev->ts && p->prev != jb->frames) 00369 p = p->prev; 00370 00371 frame->next = p; 00372 frame->prev = p->prev; 00373 00374 frame->next->prev = frame; 00375 frame->prev->next = frame; 00376 } 00377 return head; 00378 }
jb_output_function_t dbgf [static] |
Definition at line 51 of file jitterbuf.c.
jb_output_function_t errf [static] |
Definition at line 51 of file jitterbuf.c.
jb_output_function_t warnf [static] |
Definition at line 51 of file jitterbuf.c.