Merged revisions 180372 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r180372 | kpfleming | 2009-03-05 12:22:16 -0600 (Thu, 05 Mar 2009) | 9 lines
  
  Fix problems when RTP packet frame size is changed
  
  During some code analysis, I found that calling ast_rtp_codec_setpref() on an ast_rtp session does not work as expected; it does not adjust the smoother that may on the RTP session, in fact it summarily drops it, even if it has data in it, even if the current format's framing size has not changed. This is not good.
  
  This patch changes this behavior, so that if the packetization size for the current format changes, any existing smoother is safely updated to use the new size, and if no smoother was present, one is created. A new API call for smoothers, ast_smoother_reconfigure(), was required to implement these changes.
  
  Review: http://reviewboard.digium.com/r/184/
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@180373 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 62 insertions, 29 deletions

diff --git a/main/frame.c b/main/frame.c
index 912d6c739..956fea3e5 100644
--- a/main/frame.c
+++ b/main/frame.c
@@ -86,9 +86,9 @@ enum frame_type {
 struct ast_smoother {
 	int size;
 	int format;
-	int readdata;
 	int flags;
 	float samplesperbyte;
+	unsigned int opt_needs_swap:1;
 	struct ast_frame f;
 	struct timeval delivery;
 	char data[SMOOTHER_SIZE];
@@ -128,10 +128,54 @@ static const struct ast_format_list AST_FORMAT_LIST[] = {
 
 struct ast_frame ast_null_frame = { AST_FRAME_NULL, };
 
-void ast_smoother_reset(struct ast_smoother *s, int size)
+static int smoother_frame_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
+{
+	if (s->flags & AST_SMOOTHER_FLAG_G729) {
+		if (s->len % 10) {
+			ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
+			return 0;
+		}
+	}
+	if (swap) {
+		ast_swapcopy_samples(s->data + s->len, f->data.ptr, f->samples);
+	} else {
+		memcpy(s->data + s->len, f->data.ptr, f->datalen);
+	}
+	/* If either side is empty, reset the delivery time */
+	if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery)) {	/* XXX really ? */
+		s->delivery = f->delivery;
+	}
+	s->len += f->datalen;
+
+	return 0;
+}
+
+void ast_smoother_reset(struct ast_smoother *s, int bytes)
 {
 	memset(s, 0, sizeof(*s));
-	s->size = size;
+	s->size = bytes;
+}
+
+void ast_smoother_reconfigure(struct ast_smoother *s, int bytes)
+{
+	/* if there is no change, then nothing to do */
+	if (s->size == bytes) {
+		return;
+	}
+	/* set the new desired output size */
+	s->size = bytes;
+	/* if there is no 'optimized' frame in the smoother,
+	 *   then there is nothing left to do
+	 */
+	if (!s->opt) {
+		return;
+	}
+	/* there is an 'optimized' frame here at the old size,
+	 * but it must now be put into the buffer so the data
+	 * can be extracted at the new size
+	 */
+	smoother_frame_feed(s, s->opt, s->opt_needs_swap);
+	s->opt = NULL;
 }
 
 struct ast_smoother *ast_smoother_new(int size)
@@ -176,33 +220,22 @@ int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap)
 		ast_log(LOG_WARNING, "Out of smoother space\n");
 		return -1;
 	}
-	if (((f->datalen == s->size) || ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729)))
-				 && !s->opt && (f->offset >= AST_MIN_OFFSET)) {
-		if (!s->len) {
-			/* Optimize by sending the frame we just got
-			   on the next read, thus eliminating the douple
-			   copy */
-			if (swap)
-				ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
-			s->opt = f;
-			return 0;
-		}
-	}
-	if (s->flags & AST_SMOOTHER_FLAG_G729) {
-		if (s->len % 10) {
-			ast_log(LOG_NOTICE, "Dropping extra frame of G.729 since we already have a VAD frame at the end\n");
-			return 0;
-		}
+	if (((f->datalen == s->size) ||
+	     ((f->datalen < 10) && (s->flags & AST_SMOOTHER_FLAG_G729))) &&
+	    !s->opt &&
+	    !s->len &&
+	    (f->offset >= AST_MIN_OFFSET)) {
+		/* Optimize by sending the frame we just got
+		   on the next read, thus eliminating the douple
+		   copy */
+		if (swap)
+			ast_swapcopy_samples(f->data.ptr, f->data.ptr, f->samples);
+		s->opt = f;
+		s->opt_needs_swap = swap ? 1 : 0;
+		return 0;
 	}
-	if (swap)
-		ast_swapcopy_samples(s->data+s->len, f->data.ptr, f->samples);
-	else
-		memcpy(s->data + s->len, f->data.ptr, f->datalen);
-	/* If either side is empty, reset the delivery time */
-	if (!s->len || ast_tvzero(f->delivery) || ast_tvzero(s->delivery))	/* XXX really ? */
-		s->delivery = f->delivery;
-	s->len += f->datalen;
-	return 0;
+
+	return smoother_frame_feed(s, f, swap);
 }
 
 struct ast_frame *ast_smoother_read(struct ast_smoother *s)