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rtpj2kpay: manage fragmented headers correctly

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J2K main header framentation across multiple RTP packets is now handled correctly

https://bugzilla.gnome.org/show_bug.cgi?id=745187
This commit is contained in:
Aaron Boxer 2016-05-12 08:41:51 -04:00 committed by Sebastian Dröge
parent d2765be120
commit 84ff5511de
1 changed files with 36 additions and 15 deletions
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51
gst/rtp/gstrtpj2kpay.c
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@ -188,6 +188,13 @@ typedef struct
gboolean force_packet;
} RtpJ2KState;
/* Note: The standard recommends that headers be put in their own RTP packets, so we follow
* this recommendation in the code. Also, this method groups together all J2K packets
* for a tile part and treats this group as a packetization unit. According to the RFC,
* only an individual J2K packet is considered a packetization unit.
*/
static guint
find_pu_end (GstRtpJ2KPay * pay, const guint8 * data, guint size,
guint offset, RtpJ2KState * state)
@ -230,14 +237,18 @@ find_pu_end (GstRtpJ2KPay * pay, const guint8 * data, guint size,
switch (marker) {
case GST_J2K_MARKER_SOC:
GST_LOG_OBJECT (pay, "found SOC at %u", offset);
state->header.MHF = 1;
/* start off by assuming that we will fit the entire header
into the RTP payload */
state->header.MHF = 3;
break;
case GST_J2K_MARKER_SOT:
{
guint len, Psot;
GST_LOG_OBJECT (pay, "found SOT at %u", offset);
/* we found SOT but also had a header first */
/* SOT for first tile part in code stream:
force close of current RTP packet, so that it
only contains main header */
if (state->header.MHF) {
state->force_packet = TRUE;
return offset - 2;
@ -424,18 +435,26 @@ gst_rtp_j2k_pay_handle_buffer (GstRTPBasePayload * basepayload,
header = gst_rtp_buffer_get_payload (&rtp);
pu_size -= data_size;
if (pu_size == 0) {
/* reached the end of a packetization unit */
if (state.header.MHF) {
/* we were doing a header, see if all fit in one packet or if
* we had to fragment it */
if (offset == 0)
state.header.MHF = 3;
else
state.header.MHF = 2;
/* reached the end of a packetization unit */
if (pu_size == 0 && end >= map.size) {
gst_rtp_buffer_set_marker (&rtp, TRUE);
}
/* If we were processing a header, see if all fits in one RTP packet
or if we have to fragment it */
if (state.header.MHF) {
switch (state.header.MHF) {
case 3:
if (pu_size > 0)
state.header.MHF = 1;
break;
case 1:
if (pu_size == 0)
state.header.MHF = 2;
break;
default:
break;
}
if (end >= map.size)
gst_rtp_buffer_set_marker (&rtp, TRUE);
}
/*
@ -478,11 +497,13 @@ gst_rtp_j2k_pay_handle_buffer (GstRTPBasePayload * basepayload,
gst_buffer_list_add (list, outbuf);
/* reset header for next round */
state.header.MHF = 0;
state.header.T = 1;
state.header.tile = 0;
/* set MHF to zero if there is no more main header to process */
if (state.header.MHF & 2)
state.header.MHF = 0;
offset += data_size;
state.header.offset = offset;
}