ffmpeg/libavformat/nut.h

   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     int header_count;
 106     AVRational *time_base;
 107     struct AVTreeNode *syncpoints;
 108     int sp_count;
 109     int write_index;
 110     int64_t max_pts;
 111     AVRational *max_pts_tb;
 112 #define NUT_BROADCAST 1 // use extended syncpoints
 113 #define NUT_PIPE 2      // do not write syncpoints
 114     int flags;
 115     int version; // version currently in use
 116     int minor_version;
 117 } NUTContext;
 118
 119 extern const AVCodecTag ff_nut_subtitle_tags[];
 120 extern const AVCodecTag ff_nut_video_tags[];
 121 extern const AVCodecTag ff_nut_audio_tags[];
 122 extern const AVCodecTag ff_nut_audio_extra_tags[];
 123 extern const AVCodecTag ff_nut_data_tags[];
 124
 125 extern const AVCodecTag * const ff_nut_codec_tags[];
 126
 127 typedef struct Dispositions {
 128     char str[9];
 129     int flag;
 130 } Dispositions;
 131
 132 void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);
 133 int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);
 134 int ff_nut_sp_pos_cmp(const Syncpoint *a, const Syncpoint *b);
 135 int ff_nut_sp_pts_cmp(const Syncpoint *a, const Syncpoint *b);
 136 int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);
 137 void ff_nut_free_sp(NUTContext *nut);
 138
 139 extern const Dispositions ff_nut_dispositions[];
 140
 141 extern const AVMetadataConv ff_nut_metadata_conv[];
 142
 143 #endif /* AVFORMAT_NUT_H */