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libavformat
nut.h
Go to the documentation of this file.
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/*
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* "NUT" Container Format (de)muxer
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* Copyright (c) 2006 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_NUT_H
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#define AVFORMAT_NUT_H
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//#include <limits.h>
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//#include "libavutil/adler32.h"
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//#include "libavcodec/mpegaudio.h"
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#include "
avformat.h
"
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#include "
internal.h
"
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#include "
metadata.h
"
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#define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
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#define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
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#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
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#define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
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#define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
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#define ID_STRING "nut/multimedia container\0"
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#define MAX_DISTANCE (1024*32-1)
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typedef
enum
{
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FLAG_KEY
= 1,
///<if set, frame is keyframe
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FLAG_EOR
= 2,
///<if set, stream has no relevance on presentation. (EOR)
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FLAG_CODED_PTS
= 8,
///<if set, coded_pts is in the frame header
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FLAG_STREAM_ID
= 16,
///<if set, stream_id is coded in the frame header
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FLAG_SIZE_MSB
= 32,
///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
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FLAG_CHECKSUM
= 64,
///<if set, the frame header contains a checksum
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FLAG_RESERVED
= 128,
///<if set, reserved_count is coded in the frame header
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FLAG_HEADER_IDX
=1024,
///<If set, header_idx is coded in the frame header.
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FLAG_MATCH_TIME
=2048,
///<If set, match_time_delta is coded in the frame header
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FLAG_CODED
=4096,
///<if set, coded_flags are stored in the frame header
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FLAG_INVALID
=8192,
///<if set, frame_code is invalid
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}
Flag
;
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typedef
struct
Syncpoint
{
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uint64_t
pos
;
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uint64_t
back_ptr
;
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// uint64_t global_key_pts;
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int64_t
ts
;
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}
Syncpoint
;
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typedef
struct
FrameCode
{
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uint16_t
flags
;
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uint8_t
stream_id
;
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uint16_t
size_mul
;
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uint16_t
size_lsb
;
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int16_t
pts_delta
;
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uint8_t
reserved_count
;
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uint8_t
header_idx
;
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}
FrameCode
;
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typedef
struct
StreamContext
{
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int
last_flags
;
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int
skip_until_key_frame
;
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int64_t
last_pts
;
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int
time_base_id
;
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AVRational
*
time_base
;
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int
msb_pts_shift
;
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int
max_pts_distance
;
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int
decode_delay
;
//FIXME duplicate of has_b_frames
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int64_t *
keyframe_pts
;
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}
StreamContext
;
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typedef
struct
ChapterContext
{
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AVRational
*
time_base
;
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}
ChapterContext
;
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typedef
struct
NUTContext
{
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AVFormatContext
*
avf
;
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// int written_packet_size;
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// int64_t packet_start;
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FrameCode
frame_code
[256];
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uint8_t
header_len
[128];
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const
uint8_t
*
header
[128];
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uint64_t
next_startcode
;
///< stores the next startcode if it has already been parsed but the stream is not seekable
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StreamContext
*
stream
;
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ChapterContext
*
chapter
;
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unsigned
int
max_distance
;
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unsigned
int
time_base_count
;
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int64_t
last_syncpoint_pos
;
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int
header_count
;
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AVRational
*
time_base
;
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struct
AVTreeNode
*
syncpoints
;
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int
sp_count
;
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int64_t
max_pts
;
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AVRational
*
max_pts_tb
;
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}
NUTContext
;
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extern
const
AVCodecTag
ff_nut_subtitle_tags
[];
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extern
const
AVCodecTag
ff_nut_video_tags
[];
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extern
const
AVCodecTag
ff_nut_audio_tags
[];
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extern
const
AVCodecTag
ff_nut_data_tags
[];
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extern
const
AVCodecTag
*
const
ff_nut_codec_tags
[];
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typedef
struct
Dispositions
{
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char
str
[9];
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int
flag
;
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}
Dispositions
;
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void
ff_nut_reset_ts
(
NUTContext
*nut,
AVRational
time_base, int64_t val);
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int64_t
ff_lsb2full
(
StreamContext
*stream, int64_t lsb);
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int
ff_nut_sp_pos_cmp
(
const
Syncpoint
*
a
,
const
Syncpoint
*
b
);
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int
ff_nut_sp_pts_cmp
(
const
Syncpoint
*
a
,
const
Syncpoint
*
b
);
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void
ff_nut_add_sp
(
NUTContext
*nut, int64_t pos, int64_t back_ptr, int64_t ts);
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void
ff_nut_free_sp
(
NUTContext
*nut);
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extern
const
Dispositions
ff_nut_dispositions
[];
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extern
const
AVMetadataConv
ff_nut_metadata_conv
[];
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#endif
/* AVFORMAT_NUT_H */
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