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rtpbuffer: Add map flag to skip padding

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Encrypted RTP buffers may contain encrypted padding, hence it's
necessary to have an option to relax the validation in order to
successfully map the buffer.

When the flag GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING is set
gst_rtp_buffer_map() will map the buffer like if padding is not
present.

https://bugzilla.gnome.org/show_bug.cgi?id=752705
This commit is contained in:
Stian Selnes 2015-07-22 11:31:05 +02:00 committed by Sebastian Dröge
parent 79d4765525
commit 0a668c1866
3 changed files with 50 additions and 2 deletions
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5
gst-libs/gst/rtp/gstrtpbuffer.c
View file

@ -399,8 +399,9 @@ gst_rtp_buffer_map (GstBuffer * buffer, GstMapFlags flags, GstRTPBuffer * rtp)
rtp->size[1] = 0;
}
/* check for padding */
if (data[0] & 0x20) {
/* check for padding unless flags says to skip */
if ((data[0] & 0x20) != 0 &&
(flags & GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING) == 0) {
/* find memory for the padding bits */
if (!gst_buffer_find_memory (buffer, bufsize - 1, 1, &idx, &length, &skip))
goto wrong_length;

16
gst-libs/gst/rtp/gstrtpbuffer.h
View file

@ -150,6 +150,22 @@ gboolean gst_rtp_buffer_add_extension_twobytes_header (GstRTPBuffer *rtp,
gpointer data,
guint size);
/**
* GstRTPBufferMapFlags:
* @GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING: Skip mapping and validation of RTP
* padding and RTP pad count when present. Useful for buffers where
* the padding may be encrypted.
* @GST_RTP_BUFFER_MAP_FLAG_LAST: Offset to define more flags
*
* Additional mapping flags for gst_rtp_buffer_map().
*
* Since: 1.8
*/
typedef enum {
GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING = (GST_MAP_FLAG_LAST << 0),
GST_RTP_BUFFER_MAP_FLAG_LAST = (GST_MAP_FLAG_LAST << 8)
/* 8 more flags possible afterwards */
} GstRTPBufferMapFlags;
G_END_DECLS

31
tests/check/libs/rtp.c
View file

@ -171,6 +171,36 @@ GST_START_TEST (test_rtp_buffer_validate_corrupt)
GST_END_TEST;
GST_START_TEST (test_rtp_buffer_validate_padding)
{
GstBuffer *buf;
guint8 packet_with_padding[] = {
0xa0, 0x60, 0x6c, 0x49, 0x58, 0xab, 0xaa, 0x65, 0x65, 0x2e, 0xaf, 0xce,
0x68, 0xce, 0x3c, 0x80, 0x00, 0x00, 0x00, 0x04
};
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
buf = gst_buffer_new_and_alloc (sizeof (packet_with_padding));
gst_buffer_fill (buf, 0, packet_with_padding, sizeof (packet_with_padding));
fail_unless (gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp));
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buf);
/* Set the padding to something invalid */
buf = gst_buffer_new_and_alloc (sizeof (packet_with_padding));
gst_buffer_fill (buf, 0, packet_with_padding, sizeof (packet_with_padding));
gst_buffer_memset (buf, gst_buffer_get_size (buf) - 1, 0xff, 1);
fail_if (gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp));
memset (&rtp, 0, sizeof (rtp));
fail_unless (gst_rtp_buffer_map (buf, GST_MAP_READ |
GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtp));
gst_rtp_buffer_unmap (&rtp);
gst_buffer_unref (buf);
}
GST_END_TEST;
#if 0
GST_START_TEST (test_rtp_buffer_list)
{
@ -1179,6 +1209,7 @@ rtp_suite (void)
suite_add_tcase (s, tc_chain);
tcase_add_test (tc_chain, test_rtp_buffer);
tcase_add_test (tc_chain, test_rtp_buffer_validate_corrupt);
tcase_add_test (tc_chain, test_rtp_buffer_validate_padding);
tcase_add_test (tc_chain, test_rtp_buffer_set_extension_data);
//tcase_add_test (tc_chain, test_rtp_buffer_list_set_extension);
tcase_add_test (tc_chain, test_rtp_seqnum_compare);