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-rw-r--r--1.2-netsec/jitterbuf.h160
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-/*
- * jitterbuf: an application-independent jitterbuffer
- *
- * Copyrights:
- * Copyright (C) 2004-2005, Horizon Wimba, Inc.
- *
- * Contributors:
- * Steve Kann <stevek@stevek.com>
- *
- * This program is free software, distributed under the terms of
- * the GNU Lesser (Library) General Public License
- *
- * Copyright on this file is disclaimed to Digium for inclusion in Asterisk
- */
-
-#ifndef _JITTERBUF_H_
-#define _JITTERBUF_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* configuration constants */
- /* Number of historical timestamps to use in calculating jitter and drift */
-#define JB_HISTORY_SZ 500
- /* what percentage of timestamps should we drop from the history when we examine it;
- * this might eventually be something made configurable */
-#define JB_HISTORY_DROPPCT 3
- /* the maximum droppct we can handle (say it was configurable). */
-#define JB_HISTORY_DROPPCT_MAX 4
- /* the size of the buffer we use to keep the top and botton timestamps for dropping */
-#define JB_HISTORY_MAXBUF_SZ JB_HISTORY_SZ * JB_HISTORY_DROPPCT_MAX / 100
- /* amount of additional jitterbuffer adjustment */
-#define JB_TARGET_EXTRA 40
- /* ms between growing and shrinking; may not be honored if jitterbuffer runs out of space */
-#define JB_ADJUST_DELAY 40
-
-
-/* return codes */
-#define JB_OK 0
-#define JB_EMPTY 1
-#define JB_NOFRAME 2
-#define JB_INTERP 3
-#define JB_DROP 4
-#define JB_SCHED 5
-
-/* frame types */
-#define JB_TYPE_CONTROL 0
-#define JB_TYPE_VOICE 1
-#define JB_TYPE_VIDEO 2 /* reserved */
-#define JB_TYPE_SILENCE 3
-
-
-typedef struct jb_conf {
- /* settings */
- long max_jitterbuf; /* defines a hard clamp to use in setting the jitter buffer delay */
- long resync_threshold; /* the jb will resync when delay increases to (2 * jitter) + this param */
- long max_contig_interp; /* the max interp frames to return in a row */
-} jb_conf;
-
-typedef struct jb_info {
- jb_conf conf;
-
- /* statistics */
- long frames_in; /* number of frames input to the jitterbuffer.*/
- long frames_out; /* number of frames output from the jitterbuffer.*/
- long frames_late; /* number of frames which were too late, and dropped.*/
- long frames_lost; /* number of missing frames.*/
- long frames_dropped; /* number of frames dropped (shrinkage) */
- long frames_ooo; /* number of frames received out-of-order */
- long frames_cur; /* number of frames presently in jb, awaiting delivery.*/
- long jitter; /* jitter measured within current history interval*/
- long min; /* minimum lateness within current history interval */
- long current; /* the present jitterbuffer adjustment */
- long target; /* the target jitterbuffer adjustment */
- long losspct; /* recent lost frame percentage (* 1000) */
- long next_voice_ts; /* the ts of the next frame to be read from the jb - in receiver's time */
- long last_voice_ms; /* the duration of the last voice frame */
- long silence_begin_ts; /* the time of the last CNG frame, when in silence */
- long last_adjustment; /* the time of the last adjustment */
- long last_delay; /* the last now added to history */
- long cnt_delay_discont; /* the count of discontinuous delays */
- long resync_offset; /* the amount to offset ts to support resyncs */
- long cnt_contig_interp; /* the number of contiguous interp frames returned */
-} jb_info;
-
-typedef struct jb_frame {
- void *data; /* the frame data */
- long ts; /* the relative delivery time expected */
- long ms; /* the time covered by this frame, in sec/8000 */
- int type; /* the type of frame */
- struct jb_frame *next, *prev;
-} jb_frame;
-
-typedef struct jitterbuf {
- jb_info info;
-
- /* history */
- long history[JB_HISTORY_SZ]; /* history */
- int hist_ptr; /* points to index in history for next entry */
- long hist_maxbuf[JB_HISTORY_MAXBUF_SZ]; /* a sorted buffer of the max delays (highest first) */
- long hist_minbuf[JB_HISTORY_MAXBUF_SZ]; /* a sorted buffer of the min delays (lowest first) */
- int hist_maxbuf_valid; /* are the "maxbuf"/minbuf valid? */
-
-
- jb_frame *frames; /* queued frames */
- jb_frame *free; /* free frames (avoid malloc?) */
-} jitterbuf;
-
-
-/* new jitterbuf */
-jitterbuf * jb_new(void);
-
-/* destroy jitterbuf */
-void jb_destroy(jitterbuf *jb);
-
-/* reset jitterbuf */
-/* NOTE: The jitterbuffer should be empty before you call this, otherwise
- * you will leak queued frames, and some internal structures */
-void jb_reset(jitterbuf *jb);
-
-/* 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
- */
-int jb_put(jitterbuf *jb, void *data, int type, long ms, long ts, long now);
-
-/* 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.
- */
-int jb_get(jitterbuf *jb, jb_frame *frame, long now, long interpl);
-
-/* unconditionally get frames from jitterbuf until empty */
-int jb_getall(jitterbuf *jb, jb_frame *frameout);
-
-/* 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) */
-long jb_next(jitterbuf *jb);
-
-/* get jitterbuf info: only "statistics" may be valid */
-int jb_getinfo(jitterbuf *jb, jb_info *stats);
-
-/* set jitterbuf conf */
-int jb_setconf(jitterbuf *jb, jb_conf *conf);
-
-typedef void (*jb_output_function_t)(const char *fmt, ...);
-void jb_setoutput(jb_output_function_t err, jb_output_function_t warn, jb_output_function_t dbg);
-
-#ifdef __cplusplus
-}
-#endif
-
-
-#endif