This is variant 2 to fix that issue by directly calling
pjmedia_port_get_frame in stream.c after packet was sent via RTP to
ensure that there are "snychronous" calls of put- and get-frame.
---
pjmedia/src/pjmedia/stream.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/pjmedia/src/pjmedia/stream.c b/pjmedia/src/pjmedia/stream.c
index adcaa628..1f2d0457 100644
--- a/pjmedia/src/pjmedia/stream.c
+++ b/pjmedia/src/pjmedia/stream.c
@@ -240,6 +240,12 @@ static const char digitmap[17] = { '0', '1', '2', '3',
/* Zero audio frame samples */
static pj_int16_t zero_frame[2 * 30 * 16000 / 1000];
+/* null buffer to hold result of get_frame after transmit of NULL frame.
+ * Make it big enough to hold any kind of media port size connected to conf
+ * bridge, e.g. up to 30ms ptime and 16kHz samplerate
+ */
+static pj_int16_t null_buffer[2 * 30 * 16000 / 1000];
+
/*
* Print error.
*/
@@ -1318,6 +1324,14 @@ static pj_status_t put_frame_imp( pjmedia_port *port,
(const void**)&rtphdr,
&rtphdrlen);
+ /* directly call get_frame of stream to avoid filling of JB during
+ * silence period */
+ pjmedia_frame null_frame;
+ pj_bzero(&null_frame, sizeof(null_frame));
+ null_frame.buf = null_buffer;
+ null_frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
+ null_frame.size = stream->enc_samples_per_pkt * 2;
+ pjmedia_port_get_frame(&stream->port, &null_frame);
/* Encode audio frame */
} else if ((frame->type == PJMEDIA_FRAME_TYPE_AUDIO &&
--
2.13.7
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