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  1. /*
  2.  * "NUT" Container Format (de)muxer
  3.  * Copyright (c) 2006 Michael Niedermayer
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVFORMAT_NUT_H
  23. #define AVFORMAT_NUT_H
  24.  
  25. #include "avformat.h"
  26. #include "internal.h"
  27. #include "metadata.h"
  28.  
  29. #define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
  30. #define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
  31. #define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
  32. #define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
  33. #define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
  34.  
  35. #define ID_STRING "nut/multimedia container\0"
  36.  
  37. #define MAX_DISTANCE (1024*32-1)
  38.  
  39. #define NUT_MAX_VERSION 4
  40. #define NUT_STABLE_VERSION 3
  41. #define NUT_MIN_VERSION 2
  42.  
  43. typedef enum{
  44.     FLAG_KEY        =   1, // if set, frame is keyframe
  45.     FLAG_EOR        =   2, // if set, stream has no relevance on presentation. (EOR)
  46.     FLAG_CODED_PTS  =   8, // if set, coded_pts is in the frame header
  47.     FLAG_STREAM_ID  =  16, // if set, stream_id is coded in the frame header
  48.     FLAG_SIZE_MSB   =  32, // if set, data_size_msb is at frame header, otherwise data_size_msb is 0
  49.     FLAG_CHECKSUM   =  64, // if set, the frame header contains a checksum
  50.     FLAG_RESERVED   = 128, // if set, reserved_count is coded in the frame header
  51.     FLAG_SM_DATA    = 256, // if set, side / meta data is stored in the frame header.
  52.     FLAG_HEADER_IDX =1024, // If set, header_idx is coded in the frame header.
  53.     FLAG_MATCH_TIME =2048, // If set, match_time_delta is coded in the frame header
  54.     FLAG_CODED      =4096, // if set, coded_flags are stored in the frame header
  55.     FLAG_INVALID    =8192, // if set, frame_code is invalid
  56. } Flag;
  57.  
  58. typedef struct Syncpoint {
  59.     uint64_t pos;
  60.     uint64_t back_ptr;
  61. //    uint64_t global_key_pts;
  62.     int64_t ts;
  63. } Syncpoint;
  64.  
  65. typedef struct FrameCode {
  66.     uint16_t flags;
  67.     uint8_t  stream_id;
  68.     uint16_t size_mul;
  69.     uint16_t size_lsb;
  70.     int16_t  pts_delta;
  71.     uint8_t  reserved_count;
  72.     uint8_t  header_idx;
  73. } FrameCode;
  74.  
  75. typedef struct StreamContext {
  76.     int last_flags;
  77.     int skip_until_key_frame;
  78.     int64_t last_pts;
  79.     int time_base_id;
  80.     AVRational *time_base;
  81.     int msb_pts_shift;
  82.     int max_pts_distance;
  83.     int decode_delay; //FIXME duplicate of has_b_frames
  84.     int64_t *keyframe_pts;
  85. } StreamContext;
  86.  
  87. typedef struct ChapterContext {
  88.     AVRational *time_base;
  89. } ChapterContext;
  90.  
  91. typedef struct NUTContext {
  92.     const AVClass *av_class;
  93.     AVFormatContext *avf;
  94. //    int written_packet_size;
  95. //    int64_t packet_start;
  96.     FrameCode frame_code[256];
  97.     uint8_t header_len[128];
  98.     const uint8_t *header[128];
  99.     uint64_t next_startcode;     // stores the next startcode if it has already been parsed but the stream is not seekable
  100.     StreamContext *stream;
  101.     ChapterContext *chapter;
  102.     unsigned int max_distance;
  103.     unsigned int time_base_count;
  104.     int64_t last_syncpoint_pos;
  105.     int64_t last_resync_pos;
  106.     int header_count;
  107.     AVRational *time_base;
  108.     struct AVTreeNode *syncpoints;
  109.     int sp_count;
  110.     int write_index;
  111.     int64_t max_pts;
  112.     AVRational *max_pts_tb;
  113. #define NUT_BROADCAST 1 // use extended syncpoints
  114. #define NUT_PIPE 2      // do not write syncpoints
  115.     int flags;
  116.     int version; // version currently in use
  117.     int minor_version;
  118. } NUTContext;
  119.  
  120. extern const AVCodecTag ff_nut_subtitle_tags[];
  121. extern const AVCodecTag ff_nut_video_tags[];
  122. extern const AVCodecTag ff_nut_audio_tags[];
  123. extern const AVCodecTag ff_nut_audio_extra_tags[];
  124. extern const AVCodecTag ff_nut_data_tags[];
  125.  
  126. extern const AVCodecTag * const ff_nut_codec_tags[];
  127.  
  128. typedef struct Dispositions {
  129.     char str[9];
  130.     int flag;
  131. } Dispositions;
  132.  
  133. void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);
  134. int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);
  135. int ff_nut_sp_pos_cmp(const Syncpoint *a, const Syncpoint *b);
  136. int ff_nut_sp_pts_cmp(const Syncpoint *a, const Syncpoint *b);
  137. int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);
  138. void ff_nut_free_sp(NUTContext *nut);
  139.  
  140. extern const Dispositions ff_nut_dispositions[];
  141.  
  142. extern const AVMetadataConv ff_nut_metadata_conv[];
  143.  
  144. #endif /* AVFORMAT_NUT_H */
  145.