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nut.h
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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;
68  uint16_t size_mul;
69  uint16_t size_lsb;
70  int16_t pts_delta;
73 } FrameCode;
74 
75 typedef struct StreamContext {
78  int64_t last_pts;
83  int decode_delay; //FIXME duplicate of has_b_frames
84  int64_t *keyframe_pts;
86 
87 typedef struct ChapterContext {
90 
91 typedef struct NUTContext {
92  const AVClass *av_class;
94 // int written_packet_size;
95 // int64_t packet_start;
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
102  unsigned int max_distance;
103  unsigned int time_base_count;
109  int sp_count;
111  int64_t max_pts;
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
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 */