path: root/libavformat/nut.h (plain)
blob: a4409ee23d759a38725dc564e1b54d0ffee4bee9

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 void *a, const void *b);
136	int ff_nut_sp_pts_cmp(const void *a, const void *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