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diff --git a/third_party/libsrtp/src/test/rtp_decoder.h b/third_party/libsrtp/src/test/rtp_decoder.h
new file mode 100644
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+++ b/third_party/libsrtp/src/test/rtp_decoder.h
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+/*
+ * rtp_decoder.h
+ *
+ * decoder structures and functions for SRTP pcap decoder
+ *
+ * Bernardo Torres <bernardo@torresautomacao.com.br>
+ *
+ * Some structure and code from https://github.com/gteissier/srtp-decrypt
+ *
+ */
+/*
+ *
+ * Copyright (c) 2001-2017 Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ *   Neither the name of the Cisco Systems, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef RTP_DECODER_H
+#define RTP_DECODER_H
+
+#include "srtp_priv.h"
+#include "rtp.h"
+
+#define DEFAULT_RTP_OFFSET 42
+
+typedef enum {
+    mode_rtp = 0,
+    mode_rtcp,
+    mode_rtcp_mux,
+} rtp_decoder_mode_t;
+
+typedef struct rtp_decoder_ctx_t {
+    srtp_policy_t policy;
+    srtp_ctx_t *srtp_ctx;
+    rtp_decoder_mode_t mode;
+    int rtp_offset;
+    struct timeval start_tv;
+    int frame_nr;
+    int error_cnt;
+    int rtp_cnt;
+    int rtcp_cnt;
+} rtp_decoder_ctx_t;
+
+typedef struct rtp_decoder_ctx_t *rtp_decoder_t;
+
+/*
+ * prints the output of a random buffer in hexadecimal
+ */
+void hexdump(const void *ptr, size_t size);
+
+/*
+ * the function usage() prints an error message describing how this
+ * program should be called, then calls exit()
+ */
+void usage(char *prog_name);
+
+/*
+ * transforms base64 key into octet
+ */
+char *decode_sdes(char *in, char *out);
+
+/*
+ * pcap handling
+ */
+void rtp_decoder_handle_pkt(u_char *arg,
+                            const struct pcap_pkthdr *hdr,
+                            const u_char *bytes);
+
+rtp_decoder_t rtp_decoder_alloc(void);
+
+void rtp_decoder_dealloc(rtp_decoder_t rtp_ctx);
+
+int rtp_decoder_init(rtp_decoder_t dcdr,
+                     srtp_policy_t policy,
+                     rtp_decoder_mode_t mode,
+                     int rtp_packet_offset);
+
+int rtp_decoder_deinit(rtp_decoder_t decoder);
+
+void rtp_decoder_srtp_log_handler(srtp_log_level_t level,
+                                  const char *msg,
+                                  void *data);
+
+void rtp_decoder_srtp_log_handler(srtp_log_level_t level,
+                                  const char *msg,
+                                  void *data);
+
+#endif /* RTP_DECODER_H */