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 FFMPEG_NUT_H
  23 #define FFMPEG_NUT_H
  24
  25 //#include <limits.h>
  26 //#include "libavutil/adler32.h"
  27 //#include "libavcodec/mpegaudio.h"
  28 #include "avformat.h"
  29 #include "riff.h"
  30
  31 #define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
  32 #define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
  33 #define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
  34 #define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
  35 #define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
  36
  37 #define ID_STRING "nut/multimedia container\0"
  38
  39 #define MAX_DISTANCE (1024*32-1)
  40
  41 typedef enum{
  42     FLAG_KEY        =   1, ///<if set, frame is keyframe
  43     FLAG_EOR        =   2, ///<if set, stream has no relevance on presentation. (EOR)
  44     FLAG_CODED_PTS  =   8, ///<if set, coded_pts is in the frame header
  45     FLAG_STREAM_ID  =  16, ///<if set, stream_id is coded in the frame header
  46     FLAG_SIZE_MSB   =  32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
  47     FLAG_CHECKSUM   =  64, ///<if set, the frame header contains a checksum
  48     FLAG_RESERVED   = 128, ///<if set, reserved_count is coded in the frame header
  49     FLAG_HEADER_IDX =1024, ///<If set, header_idx is coded in the frame header.
  50     FLAG_MATCH_TIME =2048, ///<If set, match_time_delta is coded in the frame header
  51     FLAG_CODED      =4096, ///<if set, coded_flags are stored in the frame header
  52     FLAG_INVALID    =8192, ///<if set, frame_code is invalid
  53 }flag_t;
  54
  55 typedef struct {
  56     uint64_t pos;
  57     uint64_t back_ptr;
  58 //    uint64_t global_key_pts;
  59     int64_t ts;
  60 } syncpoint_t;
  61
  62 typedef struct {
  63     uint16_t flags;
  64     uint8_t  stream_id;
  65     uint16_t size_mul;
  66     uint16_t size_lsb;
  67     int16_t  pts_delta;
  68     uint8_t  reserved_count;
  69     uint8_t  header_idx;
  70 } FrameCode; // maybe s/FrameCode/framecode_t/ or change all to Java style but do not mix
  71
  72 typedef struct {
  73     int last_flags;
  74     int skip_until_key_frame;
  75     int64_t last_pts;
  76     int time_base_id;
  77     AVRational *time_base;
  78     int msb_pts_shift;
  79     int max_pts_distance;
  80     int decode_delay; //FIXME duplicate of has_b_frames
  81 } StreamContext;// maybe s/StreamContext/streamcontext_t/
  82
  83 typedef struct {
  84     AVFormatContext *avf;
  85 //    int written_packet_size;
  86 //    int64_t packet_start;
  87     FrameCode frame_code[256];
  88     uint8_t header_len[128];
  89     const uint8_t *header[128];
  90     uint64_t next_startcode;     ///< stores the next startcode if it has already been parsed but the stream is not seekable
  91     StreamContext *stream;
  92     unsigned int max_distance;
  93     unsigned int time_base_count;
  94     int64_t last_syncpoint_pos;
  95     int header_count;
  96     AVRational *time_base;
  97     struct AVTreeNode *syncpoints;
  98 } NUTContext;
  99
 100 extern const AVCodecTag ff_nut_subtitle_tags[];
 101
 102 typedef struct {
 103     char str[9];
 104     int flag;
 105 } Dispositions;
 106
 107 void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);
 108 int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);
 109 int ff_nut_sp_pos_cmp(syncpoint_t *a, syncpoint_t *b);
 110 int ff_nut_sp_pts_cmp(syncpoint_t *a, syncpoint_t *b);
 111 void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);
 112
 113 extern const Dispositions ff_nut_dispositions[];
 114
 115 #endif /* FFMPEG_NUT_H */