text: /**
   * The MIT License (MIT)
   *
   * Copyright (c) 2013-2021 Winlin
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef SRS_CORE_HPP
  #define SRS_CORE_HPP
  
  // The version config.
  #include <srs_core_version4.hpp>
  
  // The macros generated by configure script.
  #include <srs_auto_headers.hpp>
  
  // To convert macro values to string.
  // @see https://gcc.gnu.org/onlinedocs/cpp/Stringification.html#Stringification
  #define SRS_INTERNAL_STR(v) #v
  #define SRS_XSTR(v) SRS_INTERNAL_STR(v)
  
  // The project informations, may sent to client in HTTP header or RTMP metadata.
  #define RTMP_SIG_SRS_KEY "SRS"
  #define RTMP_SIG_SRS_CODE "Leo"
  #define RTMP_SIG_SRS_URL "https://github.com/ossrs/srs"
  #define RTMP_SIG_SRS_LICENSE "MIT"
  #define RTMP_SIG_SRS_AUTHORS "Winlin,Wenjie,Runner365,John,B.P.Y,Lixin"
  #define RTMP_SIG_SRS_VERSION SRS_XSTR(VERSION_MAJOR) "." SRS_XSTR(VERSION_MINOR) "." SRS_XSTR(VERSION_REVISION)
  #define RTMP_SIG_SRS_SERVER RTMP_SIG_SRS_KEY "/" RTMP_SIG_SRS_VERSION "(" RTMP_SIG_SRS_CODE ")"
  #define RTMP_SIG_SRS_DOMAIN "ossrs.net"
  
  // The current stable release.
  #define VERSION_STABLE 3
  #define VERSION_STABLE_BRANCH SRS_XSTR(VERSION_STABLE) ".0release"
  
  // For 32bit os, 2G big file limit for unistd io,
  // ie. read/write/lseek to use 64bits size for huge file.
  #ifndef _FILE_OFFSET_BITS
      #define _FILE_OFFSET_BITS 64
  #endif
  
  // For int64_t print using PRId64 format.
  #ifndef __STDC_FORMAT_MACROS
      #define __STDC_FORMAT_MACROS
  #endif
  
  // For RTC/FFMPEG build.
  #if defined(SRS_RTC) && !defined(__STDC_CONSTANT_MACROS)
      #define __STDC_CONSTANT_MACROS
  #endif
  
  // For srs-librtmp, @see https://github.com/ossrs/srs/issues/213
  #ifndef _WIN32
  #include <inttypes.h>
  #endif
  
  #include <assert.h>
  #define srs_assert(expression) assert(expression)
  
  #include <stddef.h>
  #include <sys/types.h>
  
  // The time unit for timeout, interval or duration.
  #include <srs_core_time.hpp>
  
  // Some important performance options.
  #include <srs_core_performance.hpp>
  
  // To free the p and set to NULL.
  // @remark The p must be a pointer T*.
  #define srs_freep(p) \
      if (p) { \
          delete p; \
          p = NULL; \
      } \
      (void)0
  // Please use the freepa(T[]) to free an array, otherwise the behavior is undefined.
  #define srs_freepa(pa) \
      if (pa) { \
          delete[] pa; \
          pa = NULL; \
      } \
      (void)0
  
  // Checking for st(state-threads), only support the following cpus: i386/amd64/x86_64/arm
  // @reamrk To patch ST for arm, read https://github.com/ossrs/state-threads/issues/1
  #if !defined(__amd64__) && !defined(__x86_64__) && !defined(__i386__) && !defined(__arm__) && !defined(__aarch64__)
      #error "only support i386/amd64/x86_64/arm cpu"
  #endif
  
  // Error predefined for all modules.
  class SrsCplxError;
  typedef SrsCplxError* srs_error_t;
  
  #include <string>
  // The context ID, it default to a string object, we can also use other objects.
  // @remark User can directly user string as SrsContextId, we user struct to ensure the context is an object.
  #if 1
  class _SrsContextId
  {
  private:
      std::string v_;
  public:
      _SrsContextId();
      _SrsContextId(const _SrsContextId& cp);
      _SrsContextId& operator=(const _SrsContextId& cp);
      virtual ~_SrsContextId();
  public:
      const char* c_str() const;
      bool empty() const;
      // Compare the two context id. @see http://www.cplusplus.com/reference/string/string/compare/
      //      0	They compare equal
      //      <0	Either the value of the first character that does not match is lower in the compared string, or all compared characters match but the compared string is shorter.
      //      >0	Either the value of the first character that does not match is greater in the compared string, or all compared characters match but the compared string is longer.
      int compare(const _SrsContextId& to) const;
      // Set the value of context id.
      _SrsContextId& set_value(const std::string& v);
  };
  typedef _SrsContextId SrsContextId;
  #else
  // Actually, we can directly user string as SrsContextId.
  typedef std::string SrsContextId;
  #endif
  
  #endif
  