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rtcpbuffer: Allow padding on first reduced size packets

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It is valid to have the padding set to 1 on the first packet and it
happens very often from TWCC packets coming from libwebrtc. This means
that we were totally ignoring many TWCC packets.

Fix test that checked that a first packet with padding was not valid and
instead test a single twcc packet with padding to check precisely what
this patch was about.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2422>
This commit is contained in:
Thibault Saunier 2022-05-15 16:53:12 +00:00 committed by GStreamer Marge Bot
parent bf79a6908c
commit 3296c678b3
3 changed files with 18 additions and 18 deletions
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5
subprojects/gst-plugins-base/gst-libs/gst/rtp/gstrtcpbuffer.c
View file

@ -109,8 +109,7 @@ gst_rtcp_buffer_validate_data_internal (guint8 * data, guint len,
if (G_UNLIKELY (header_mask != GST_RTCP_VALID_VALUE))
goto wrong_mask;
/* no padding when mask succeeds */
padding = FALSE;
padding = data[0] & 0x20;
/* store len */
data_len = len;
@ -129,7 +128,7 @@ gst_rtcp_buffer_validate_data_internal (guint8 * data, guint len,
if (data_len < 4)
break;
/* padding only allowed on last packet */
/* Version already checked for first packet through mask */
if (padding)
break;

4
subprojects/gst-plugins-base/gst-libs/gst/rtp/gstrtcpbuffer.h
View file

@ -262,10 +262,10 @@ typedef enum
/**
* GST_RTCP_REDUCED_SIZE_VALID_MASK:
*
* Mask for version, padding bit and packet type pair allowing reduced size
* Mask for version and packet type pair allowing reduced size
* packets, basically it accepts other types than RR and SR
*/
#define GST_RTCP_REDUCED_SIZE_VALID_MASK (0xc000 | 0x2000 | 0xf8)
#define GST_RTCP_REDUCED_SIZE_VALID_MASK (0xc000 | 0xf8)
/**
* GST_RTCP_VALID_VALUE:

27
subprojects/gst-plugins-base/tests/check/libs/rtp.c
View file

@ -31,6 +31,8 @@
#define RTP_HEADER_LEN 12
static GstBuffer *create_feedback_buffer (gboolean with_padding);
GST_START_TEST (test_rtp_buffer)
{
GstBuffer *buf;
@ -1073,20 +1075,19 @@ GST_END_TEST;
GST_START_TEST (test_rtcp_validate_reduced_with_padding)
{
/* Reduced size packet with padding. */
guint8 rtcp_pkt[] = {
0xA0, 0xcd, 0x00, 0x08, /* P=1, Type FB, length = 8 */
0x97, 0x6d, 0x21, 0x6a,
0x4d, 0x16, 0xaf, 0x14,
0x10, 0x1f, 0xd9, 0x91,
0x0f, 0xb7, 0x50, 0x88,
0x3b, 0x79, 0x31, 0x50,
0xbe, 0x19, 0x12, 0xa8,
0xbb, 0xce, 0x9e, 0x3e,
0x00, 0x00, 0x00, 0x04 /* RTCP padding */
};
GstRTCPPacket packet;
GstRTCPBuffer rtcp = GST_RTCP_BUFFER_INIT;
GstBuffer *buffer = create_feedback_buffer (TRUE);
fail_if (gst_rtcp_buffer_validate_data_reduced (rtcp_pkt, sizeof (rtcp_pkt)));
gst_rtcp_buffer_map (buffer, GST_MAP_READ, &rtcp);
fail_unless (gst_rtcp_buffer_get_first_packet (&rtcp, &packet));
fail_unless (gst_rtcp_packet_get_padding (&packet));
gst_rtcp_buffer_unmap (&rtcp);
fail_unless (gst_rtcp_buffer_validate_reduced (buffer));
fail_if (gst_rtcp_buffer_validate (buffer));
gst_buffer_unref (buffer);
}
GST_END_TEST;