text: /*
   * "NUT" Container Format (de)muxer
   * Copyright (c) 2006 Michael Niedermayer
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #ifndef AVFORMAT_NUT_H
  #define AVFORMAT_NUT_H
  
  #include "avformat.h"
  #include "internal.h"
  #include "metadata.h"
  
  #define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
  #define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
  #define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
  #define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
  #define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
  
  #define ID_STRING "nut/multimedia container\0"
  
  #define MAX_DISTANCE (1024*32-1)
  
  #define NUT_MAX_VERSION 4
  #define NUT_STABLE_VERSION 3
  #define NUT_MIN_VERSION 2
  
  typedef enum{
      FLAG_KEY        =   1, ///<if set, frame is keyframe
      FLAG_EOR        =   2, ///<if set, stream has no relevance on presentation. (EOR)
      FLAG_CODED_PTS  =   8, ///<if set, coded_pts is in the frame header
      FLAG_STREAM_ID  =  16, ///<if set, stream_id is coded in the frame header
      FLAG_SIZE_MSB   =  32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
      FLAG_CHECKSUM   =  64, ///<if set, the frame header contains a checksum
      FLAG_RESERVED   = 128, ///<if set, reserved_count is coded in the frame header
      FLAG_SM_DATA    = 256, ///<if set, side / meta data is stored in the frame header.
      FLAG_HEADER_IDX =1024, ///<If set, header_idx is coded in the frame header.
      FLAG_MATCH_TIME =2048, ///<If set, match_time_delta is coded in the frame header
      FLAG_CODED      =4096, ///<if set, coded_flags are stored in the frame header
      FLAG_INVALID    =8192, ///<if set, frame_code is invalid
  } Flag;
  
  typedef struct Syncpoint {
      uint64_t pos;
      uint64_t back_ptr;
  //    uint64_t global_key_pts;
      int64_t ts;
  } Syncpoint;
  
  typedef struct FrameCode {
      uint16_t flags;
      uint8_t  stream_id;
      uint16_t size_mul;
      uint16_t size_lsb;
      int16_t  pts_delta;
      uint8_t  reserved_count;
      uint8_t  header_idx;
  } FrameCode;
  
  typedef struct StreamContext {
      int last_flags;
      int skip_until_key_frame;
      int64_t last_pts;
      int time_base_id;
      AVRational *time_base;
      int msb_pts_shift;
      int max_pts_distance;
      int decode_delay; //FIXME duplicate of has_b_frames
      int64_t *keyframe_pts;
  } StreamContext;
  
  typedef struct ChapterContext {
      AVRational *time_base;
  } ChapterContext;
  
  typedef struct NUTContext {
      const AVClass *av_class;
      AVFormatContext *avf;
  //    int written_packet_size;
  //    int64_t packet_start;
      FrameCode frame_code[256];
      uint8_t header_len[128];
      const uint8_t *header[128];
      uint64_t next_startcode;     ///< stores the next startcode if it has already been parsed but the stream is not seekable
      StreamContext *stream;
      ChapterContext *chapter;
      unsigned int max_distance;
      unsigned int time_base_count;
      int64_t last_syncpoint_pos;
      int header_count;
      AVRational *time_base;
      struct AVTreeNode *syncpoints;
      int sp_count;
      int write_index;
      int64_t max_pts;
      AVRational *max_pts_tb;
  #define NUT_BROADCAST 1 // use extended syncpoints
  #define NUT_PIPE 2      // do not write syncpoints
      int flags;
      int version; // version currently in use
      int minor_version;
  } NUTContext;
  
  extern const AVCodecTag ff_nut_subtitle_tags[];
  extern const AVCodecTag ff_nut_video_tags[];
  extern const AVCodecTag ff_nut_audio_tags[];
  extern const AVCodecTag ff_nut_audio_extra_tags[];
  extern const AVCodecTag ff_nut_data_tags[];
  
  extern const AVCodecTag * const ff_nut_codec_tags[];
  
  typedef struct Dispositions {
      char str[9];
      int flag;
  } Dispositions;
  
  void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);
  int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);
  int ff_nut_sp_pos_cmp(const Syncpoint *a, const Syncpoint *b);
  int ff_nut_sp_pts_cmp(const Syncpoint *a, const Syncpoint *b);
  int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);
  void ff_nut_free_sp(NUTContext *nut);
  
  extern const Dispositions ff_nut_dispositions[];
  
  extern const AVMetadataConv ff_nut_metadata_conv[];
  
  #endif /* AVFORMAT_NUT_H */
  