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sdp: gstmikey: gst_mikey_message_to_caps: extract ROC from first crypto session

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We need the ROC to decrypt a SRTP stream as the ROC is part of the AES IV.
So look for first crypto session, from which we can get the ROC and find corresponding
crypto policy.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3568>
This commit is contained in:
Bart Van Severen 2022-12-14 10:29:27 +01:00 committed by GStreamer Marge Bot
parent befab7af72
commit 5678151799
1 changed files with 13 additions and 2 deletions
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15
subprojects/gst-plugins-base/gst-libs/gst/sdp/gstmikey.c
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@ -2379,6 +2379,7 @@ gboolean
gst_mikey_message_to_caps (const GstMIKEYMessage * msg, GstCaps * caps)
{
gboolean res = FALSE;
const GstMIKEYMapSRTP *srtp;
const GstMIKEYPayload *payload;
const gchar *srtp_cipher;
const gchar *srtp_auth;
@ -2386,8 +2387,16 @@ gst_mikey_message_to_caps (const GstMIKEYMessage * msg, GstCaps * caps)
srtp_cipher = "aes-128-icm";
srtp_auth = "hmac-sha1-80";
/* check the Security policy if any */
if ((payload = gst_mikey_message_find_payload (msg, GST_MIKEY_PT_SP, 0))) {
/* Look for first crypto session */
if (!(srtp = gst_mikey_message_get_cs_srtp (msg, 0))) {
GST_ERROR ("No crypto session found at index 0");
goto done;
}
/* Look for crypto policy corresponding to first crypto session */
if ((payload =
gst_mikey_message_find_payload (msg, GST_MIKEY_PT_SP,
(unsigned int) srtp->policy))) {
GstMIKEYPayloadSP *p = (GstMIKEYPayloadSP *) payload;
guint len, i;
guint enc_alg = GST_MIKEY_ENC_NULL;
@ -2495,6 +2504,8 @@ gst_mikey_message_to_caps (const GstMIKEYMessage * msg, GstCaps * caps)
buf = gst_buffer_new_memdup (pkd->key_data, pkd->key_len);
gst_caps_set_simple (caps, "srtp-key", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
gst_caps_set_simple (caps, "roc", G_TYPE_UINT, srtp->roc, NULL);
}
gst_caps_set_simple (caps,