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rtpmp2tpay: respect mtu and packet boundaries

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See #659915.
This commit is contained in:
Mark Nauwelaerts 2012-05-18 12:53:44 +02:00
parent f96d18e959
commit 182596b3ab
1 changed files with 56 additions and 27 deletions
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83
gst/rtp/gstrtpmp2tpay.c
View file

@ -117,35 +117,56 @@ gst_rtp_mp2t_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
static GstFlowReturn
gst_rtp_mp2t_pay_flush (GstRTPMP2TPay * rtpmp2tpay)
{
guint avail;
guint8 *payload;
GstFlowReturn ret;
guint avail, mtu;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf;
GstRTPBuffer rtp = { NULL };
avail = gst_adapter_available (rtpmp2tpay->adapter);
if (avail == 0)
return GST_FLOW_OK;
outbuf = gst_rtp_buffer_new_allocate (avail, 0, 0);
/* get payload */
gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
mtu = GST_RTP_BASE_PAYLOAD_MTU (rtpmp2tpay);
/* copy stuff from adapter to payload */
gst_adapter_copy (rtpmp2tpay->adapter, payload, 0, avail);
gst_rtp_buffer_unmap (&rtp);
while (avail > 0 && (ret == GST_FLOW_OK)) {
guint towrite;
guint8 *payload;
guint payload_len;
guint packet_len;
GstRTPBuffer rtp = { NULL };
GST_BUFFER_TIMESTAMP (outbuf) = rtpmp2tpay->first_ts;
GST_BUFFER_DURATION (outbuf) = rtpmp2tpay->duration;
/* this will be the total length of the packet */
packet_len = gst_rtp_buffer_calc_packet_len (avail, 0, 0);
GST_DEBUG_OBJECT (rtpmp2tpay, "pushing buffer of size %" G_GSIZE_FORMAT,
gst_buffer_get_size (outbuf));
/* fill one MTU or all available bytes */
towrite = MIN (packet_len, mtu);
ret = gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtpmp2tpay), outbuf);
/* this is the payload length */
payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);
payload_len -= payload_len % 188;
/* flush the adapter content */
gst_adapter_flush (rtpmp2tpay->adapter, avail);
/* need whole packets */
if (!payload_len)
break;
/* create buffer to hold the payload */
outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
/* get payload */
gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
payload = gst_rtp_buffer_get_payload (&rtp);
/* copy stuff from adapter to payload */
gst_adapter_copy (rtpmp2tpay->adapter, payload, 0, payload_len);
gst_rtp_buffer_unmap (&rtp);
gst_adapter_flush (rtpmp2tpay->adapter, payload_len);
avail -= payload_len;
GST_BUFFER_TIMESTAMP (outbuf) = rtpmp2tpay->first_ts;
GST_BUFFER_DURATION (outbuf) = rtpmp2tpay->duration;
GST_DEBUG_OBJECT (rtpmp2tpay, "pushing buffer of size %d",
gst_buffer_get_size (outbuf));
ret = gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtpmp2tpay), outbuf);
}
return ret;
}
@ -165,6 +186,7 @@ gst_rtp_mp2t_pay_handle_buffer (GstRTPBasePayload * basepayload,
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
again:
ret = GST_FLOW_OK;
avail = gst_adapter_available (rtpmp2tpay->adapter);
@ -174,13 +196,12 @@ gst_rtp_mp2t_pay_handle_buffer (GstRTPBasePayload * basepayload,
rtpmp2tpay->duration = duration;
}
/* get packet length of previous data and this new data,
* payload length includes a 4 byte header */
packet_len = gst_rtp_buffer_calc_packet_len (4 + avail + size, 0, 0);
/* get packet length of previous data and this new data */
packet_len = gst_rtp_buffer_calc_packet_len (avail + size, 0, 0);
/* if this buffer is going to overflow the packet, flush what we
* have. */
if (gst_rtp_base_payload_is_filled (basepayload,
/* if this buffer is going to overflow the packet, flush what we have,
* or if upstream is handing us several packets, to keep latency low */
if (!size || gst_rtp_base_payload_is_filled (basepayload,
packet_len, rtpmp2tpay->duration + duration)) {
ret = gst_rtp_mp2t_pay_flush (rtpmp2tpay);
rtpmp2tpay->first_ts = timestamp;
@ -193,7 +214,15 @@ gst_rtp_mp2t_pay_handle_buffer (GstRTPBasePayload * basepayload,
}
/* copy buffer to adapter */
gst_adapter_push (rtpmp2tpay->adapter, buffer);
if (buffer) {
gst_adapter_push (rtpmp2tpay->adapter, buffer);
buffer = NULL;
}
if (size >= (188 * 2)) {
size = 0;
goto again;
}
return ret;