Add RTSP example

tutorials/tcp/rtsp-video-stream/Makefile

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+PROG ?= example                   # Program we are building
+DELETE = rm -rf                   # Command to remove files
+OUT ?= -o $(PROG)                 # Compiler argument for output file
+SOURCES = main.c mongoose.c rtsp.c  # Source code files
+CFLAGS = -W -Wall -Wextra -g -I. -include rtsp.h  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+#CFLAGS_MONGOOSE += -DMG_ENABLE_LINES
+
+ifeq ($(OS),Windows_NT)   # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
+  PROG ?= example.exe           # Use .exe suffix for the binary
+  CC = gcc                      # Use MinGW gcc compiler
+  CFLAGS += -lws2_32            # Link against Winsock library
+  DELETE = cmd /C del /Q /F /S  # Command prompt command to delete files
+  OUT ?= -o $(PROG)             # Build output
+endif
+
+all: $(PROG)              # Default target. Build and run program
+	$(RUN) ./$(PROG) $(ARGS)
+
+$(PROG): $(SOURCES)       # Build program from sources
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
+
+clean:                    # Cleanup. Delete built program and all build artifacts
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM

tutorials/tcp/rtsp-video-stream/main.c

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+// Copyright (c) 2026 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+int main(void) {
+  struct mg_mgr mgr;
+
+  struct mg_rtsp_opts opts = {
+      0,
+      0,
+      0,
+      mg_rtsp_get_mp4_frame,
+      (void *) "test.mp4",
+      mg_rtsp_get_mp4_audio,
+      (void *) "test.mp4",
+      {0x12, 0x10},
+  };
+
+  mg_mgr_init(&mgr);
+  mg_rtsp_listen(&mgr, "rtsp://0.0.0.0:8554/cam", &opts);
+
+  while (true) {
+    mg_mgr_poll(&mgr, 10);
+  }
+  mg_mgr_free(&mgr);
+  return 0;
+}

tutorials/tcp/rtsp-video-stream/mongoose.c

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+../../../mongoose.c

tutorials/tcp/rtsp-video-stream/mongoose.h

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+../../../mongoose.h