mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-10-03 01:02:19 +00:00
Code Issues 1 Projects Releases Wiki Activity

rtpbuffer: get_onebyte_header_end_offset: allow 0 offset

Browse source 
There are some cases where the full extension data could be padding.
In order to make the GstRtpBuffer robust enough, this change supports
this case.
This commit is contained in:
Miguel Paris 2019-12-13 16:06:44 +01:00
parent 3f79805aa0
commit 2d4d28d662
1 changed files with 19 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
gst-libs/gst/rtp/gstrtpbuffer.c
View file

@ -1510,19 +1510,20 @@ gst_rtp_buffer_get_extension_twobytes_header (GstRTPBuffer * rtp,
return FALSE;
}
static guint
get_onebyte_header_end_offset (guint8 * pdata, guint wordlen)
static gboolean
get_onebyte_header_end_offset (guint8 * pdata, guint wordlen, guint *offset)
{
guint offset = 0;
guint bytelen = wordlen * 4;
guint paddingcount = 0;
while (offset + 1 < bytelen) {
*offset = 0;
while (*offset + 1 < bytelen) {
guint8 read_id, read_len;
read_id = GST_READ_UINT8 (pdata + offset) >> 4;
read_len = (GST_READ_UINT8 (pdata + offset) & 0x0F) + 1;
offset += 1;
read_id = GST_READ_UINT8 (pdata + *offset) >> 4;
read_len = (GST_READ_UINT8 (pdata + *offset) & 0x0F) + 1;
*offset += 1;
/* ID 0 means its padding, skip */
if (read_id == 0) {
@ -1534,17 +1535,21 @@ get_onebyte_header_end_offset (guint8 * pdata, guint wordlen)
/* ID 15 is special and means we should stop parsing */
/* It also means we can't add an extra packet */
if (read_id == 15)
return 0;
if (read_id == 15) {
return FALSE;
}
/* Ignore extension headers where the size does not fit */
if (offset + read_len > bytelen)
return 0;
if (*offset + read_len > bytelen) {
return FALSE;
}
offset += read_len;
*offset += read_len;
}
return offset - paddingcount;
*offset -= paddingcount;
return TRUE;
}
/**
@ -1586,8 +1591,7 @@ gst_rtp_buffer_add_extension_onebyte_header (GstRTPBuffer * rtp, guint8 id,
if (bits != 0xBEDE)
return FALSE;
offset = get_onebyte_header_end_offset (pdata, wordlen);
if (offset == 0)
if (!get_onebyte_header_end_offset (pdata, wordlen, &offset))
return FALSE;
}