fix(libsrtp): address PR #1060 review feedback

- config.h: drop three duplicate macro defines (HAVE_STDINT_H,
  HAVE_SYS_TYPES_H, ERR_REPORTING_STDOUT)
- crypto_kernel.c: gate AES-ICM-192 on SOC_AES_SUPPORT_AES_192 instead
  of unconditional #if 0; ESP32 (only SoC with hw AES-192) now enables
  the cipher, other SoCs continue to skip it since mbedtls_aes_setkey
  returns PLATFORM_FEATURE_UNSUPPORTED for 192-bit keys there
- examples/get_started/README.md: fix link, repo migrated from
  idf-extra-components to esp-protocols
- LICENSE: prepend dual-license header (Apache-2.0 wrapper +
  BSD-3-Clause bundled libsrtp), keep Apache full text below

components/libsrtp/LICENSE

@@ -1,3 +1,15 @@
+This component is dual-licensed:
+
+  - Apache-2.0 — the ESP-IDF wrapper code in this component (port/, include/,
+    Kconfig, CMakeLists.txt, host_test/, examples/). Full text below.
+
+  - BSD-3-Clause — the bundled libsrtp upstream sources under libsrtp/.
+    See libsrtp/LICENSE for the full text.
+
+Third-party attribution is in NOTICE.
+
+================================================================================
+
 
                                  Apache License
                            Version 2.0, January 2004

components/libsrtp/examples/get_started/README.md

@@ -1,6 +1,6 @@
 # libsrtp — get_started
 
-Minimal sanity-check application for [`libsrtp`](https://github.com/espressif/idf-extra-components/tree/master/libsrtp). Initializes libsrtp via `srtp_init()` and shuts it down. Used by the repo's CI to verify the component compiles and links across supported targets; also useful as a copy-paste starting point.
+Minimal sanity-check application for [`libsrtp`](https://github.com/espressif/esp-protocols/tree/master/components/libsrtp). Initializes libsrtp via `srtp_init()` and shuts it down. Used by the repo's CI to verify the component compiles and links across supported targets; also useful as a copy-paste starting point.
 
 ## Build
 

components/libsrtp/port/config.h

@@ -67,9 +67,7 @@
 #define SIZEOF_UNSIGNED_LONG_LONG 8
 
 /* Force SRTP to use system types */
-#define HAVE_STDINT_H 1
 #define HAVE_INTTYPES_H 1
-#define HAVE_SYS_TYPES_H 1
 #define HAVE_UINT64_T 1
 #define HAVE_UINT32_T 1
 #define HAVE_UINT16_T 1
@@ -82,18 +80,7 @@
 /* Prevent SRTP from redefining types */
 #define INTEGERS_H
 
-/* Prevent srtp_ssrc_t redefinition */
-#ifdef __XTENSA__
-#define SRTP_KERNEL_COMPAT
-#endif
-
-/* Prevent in_addr_t redefinition */
-#ifndef _LWIP_INET_H
-typedef uint32_t in_addr_t;
-#endif
-
 #define GCM 1
 #define MBEDTLS 1
-#define ERR_REPORTING_STDOUT 1
 
 #endif /* CONFIG_H */

components/libsrtp/port/crypto_kernel.c

@@ -46,6 +46,10 @@
 #include <config.h>
 #endif
 
+#if defined(__has_include) && __has_include("soc/soc_caps.h")
+#include "soc/soc_caps.h"
+#endif
+
 #include "alloc.h"
 
 #include "crypto_kernel.h"
@@ -127,7 +131,12 @@ srtp_err_status_t srtp_crypto_kernel_init(void)
         return status;
     }
 #ifdef GCM
-#if 0
+    /* AES-ICM-192: only the original ESP32 has SoC AES-192 support
+     * (SOC_AES_SUPPORT_AES_192). On every later SoC the mbedtls port returns
+     * MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED for 192-bit keys (no software
+     * fallback in IDF's mbedtls), so letting libsrtp claim this cipher would
+     * surface as a test failure during the cipher self-tests. */
+#if defined(SOC_AES_SUPPORT_AES_192) && SOC_AES_SUPPORT_AES_192
     status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_192,
                                                  SRTP_AES_ICM_192);
     if (status) {