Merge "abstract/fixed/adpative jitter buffer: disallow frame re-inserts"

include/asterisk/abstract_jb.h

@@ -109,6 +109,8 @@ typedef int (*jb_remove_impl)(void *jb, struct ast_frame **fout);
 typedef void (*jb_force_resynch_impl)(void *jb);
 /*! \brief Empty and reset jb */
 typedef void (*jb_empty_and_reset_impl)(void *jb);
+/*! \brief Check if late */
+typedef int (*jb_is_late_impl)(void *jb, long ts);
 
 
 /*!
@@ -127,6 +129,7 @@ struct ast_jb_impl
 	jb_remove_impl remove;
 	jb_force_resynch_impl force_resync;
 	jb_empty_and_reset_impl empty_and_reset;
+	jb_is_late_impl is_late;
 };
 
 /*!

include/asterisk/frame.h

@@ -133,6 +133,8 @@ enum ast_frame_type {
 enum {
 	/*! This frame contains valid timing information */
 	AST_FRFLAG_HAS_TIMING_INFO = (1 << 0),
+	/*! This frame has been requeued */
+	AST_FRFLAG_REQUEUED = (1 << 1),
 };
 
 struct ast_frame_subclass {

include/jitterbuf.h

@@ -166,6 +166,9 @@ enum jb_return_code jb_setconf(jitterbuf *jb, jb_conf *conf);
 typedef void __attribute__((format(printf, 1, 2))) (*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);
 
+/*! \brief Checks if the given time stamp is late */
+int jb_is_late(jitterbuf *jb, long ts);
+
 #ifdef __cplusplus
 }
 #endif

main/abstract_jb.c

@@ -65,6 +65,7 @@ static long jb_next_fixed(void *jb);
 static int jb_remove_fixed(void *jb, struct ast_frame **fout);
 static void jb_force_resynch_fixed(void *jb);
 static void jb_empty_and_reset_fixed(void *jb);
+static int jb_is_late_fixed(void *jb, long ts);
 /* adaptive */
 static void * jb_create_adaptive(struct ast_jb_conf *general_config);
 static void jb_destroy_adaptive(void *jb);
@@ -75,6 +76,7 @@ static long jb_next_adaptive(void *jb);
 static int jb_remove_adaptive(void *jb, struct ast_frame **fout);
 static void jb_force_resynch_adaptive(void *jb);
 static void jb_empty_and_reset_adaptive(void *jb);
+static int jb_is_late_adaptive(void *jb, long ts);
 
 /* Available jb implementations */
 static const struct ast_jb_impl avail_impl[] = {
@@ -90,6 +92,7 @@ static const struct ast_jb_impl avail_impl[] = {
 		.remove = jb_remove_fixed,
 		.force_resync = jb_force_resynch_fixed,
 		.empty_and_reset = jb_empty_and_reset_fixed,
+		.is_late = jb_is_late_fixed,
 	},
 	{
 		.name = "adaptive",
@@ -103,6 +106,7 @@ static const struct ast_jb_impl avail_impl[] = {
 		.remove = jb_remove_adaptive,
 		.force_resync = jb_force_resynch_adaptive,
 		.empty_and_reset = jb_empty_and_reset_adaptive,
+		.is_late = jb_is_late_adaptive,
 	}
 };
 
@@ -704,6 +708,11 @@ static void jb_empty_and_reset_fixed(void *jb)
 	}
 }
 
+static int jb_is_late_fixed(void *jb, long ts)
+{
+	return fixed_jb_is_late(jb, ts);
+}
+
 /* adaptive */
 
 static void *jb_create_adaptive(struct ast_jb_conf *general_config)
@@ -810,6 +819,11 @@ const struct ast_jb_impl *ast_jb_get_impl(enum ast_jb_type type)
 	return NULL;
 }
 
+static int jb_is_late_adaptive(void *jb, long ts)
+{
+	return jb_is_late(jb, ts);
+}
+
 #define DEFAULT_TIMER_INTERVAL 20
 #define DEFAULT_SIZE  200
 #define DEFAULT_TARGET_EXTRA  40
@@ -893,7 +907,22 @@ static struct ast_frame *hook_event_cb(struct ast_channel *chan, struct ast_fram
 		}
 	}
 
-	if (!frame) {
+	/*
+	 * If the frame has been requeued (for instance when the translate core returns
+	 * more than one frame) then if the frame is late we want to immediately return
+	 * it. Otherwise attempt to insert it into the jitterbuffer.
+	 *
+	 * If the frame is requeued and late then in all likely hood it's a frame that
+	 * that was previously retrieved from the jitterbuffer, passed to the translate
+	 * core, and then put back into the channel read queue. Even if it had not been
+	 * in the jitterbuffer prior to now it needs to be the next frame "out".
+	 *
+	 * However late arriving frames that have not been requeued (i.e. regular frames)
+	 * need to be passed to the jitterbuffer so they can be appropriately dropped. As
+	 * well any requeued frames that are not late should be put into the jitterbuffer.
+	 */
+	if (!frame || (ast_test_flag(frame, AST_FRFLAG_REQUEUED) &&
+		       framedata->jb_impl->is_late(framedata->jb_obj, frame->ts))) {
 		return frame;
 	}
 

main/channel.c

@@ -4333,12 +4333,19 @@ static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
 			 * at the end of the queue.
 			 */
 			if (AST_LIST_NEXT(f, frame_list)) {
-				if (!readq_tail) {
-					ast_queue_frame_head(chan, AST_LIST_NEXT(f, frame_list));
-				} else {
-					__ast_queue_frame(chan, AST_LIST_NEXT(f, frame_list), 0, readq_tail);
+				struct ast_frame *cur, *multi_frame = AST_LIST_NEXT(f, frame_list);
+
+				/* Mark these frames as being re-queued */
+				for (cur = multi_frame; cur; cur = AST_LIST_NEXT(cur, frame_list)) {
+					ast_set_flag(cur, AST_FRFLAG_REQUEUED);
 				}
-				ast_frfree(AST_LIST_NEXT(f, frame_list));
+
+				if (!readq_tail) {
+					ast_queue_frame_head(chan, multi_frame);
+				} else {
+					__ast_queue_frame(chan, multi_frame, 0, readq_tail);
+				}
+				ast_frfree(multi_frame);
 				AST_LIST_NEXT(f, frame_list) = NULL;
 			}
 

main/fixedjitterbuf.c

@@ -194,7 +194,6 @@ int fixed_jb_put_first(struct fixed_jb *jb, void *data, long ms, long ts, long n
 	return fixed_jb_put(jb, data, ms, ts, now);
 }
 
-
 int fixed_jb_put(struct fixed_jb *jb, void *data, long ms, long ts, long now)
 {
 	struct fixed_jb_frame *frame, *next, *newframe;
@@ -347,3 +346,8 @@ int fixed_jb_remove(struct fixed_jb *jb, struct fixed_jb_frame *frameout)
 
 	return FIXED_JB_OK;
 }
+
+int fixed_jb_is_late(struct fixed_jb *jb, long ts)
+{
+	return jb->rxcore + jb->delay + ts < jb->next_delivery;
+}

main/fixedjitterbuf.h

@@ -85,6 +85,9 @@ int fixed_jb_remove(struct fixed_jb *jb, struct fixed_jb_frame *frameout);
 
 void fixed_jb_set_force_resynch(struct fixed_jb *jb);
 
+/*! \brief Checks if the given time stamp is late */
+int fixed_jb_is_late(struct fixed_jb *jb, long ts);
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif

main/jitterbuf.c

@@ -843,4 +843,7 @@ enum jb_return_code jb_setconf(jitterbuf *jb, jb_conf *conf)
 	return JB_OK;
 }
 
-
+int jb_is_late(jitterbuf *jb, long ts)
+{
+	return ts + jb->info.current < jb->info.next_voice_ts;
+}