FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
nut.h
Go to the documentation of this file.
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_VERSION 3
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;
54 
55 typedef struct Syncpoint {
56  uint64_t pos;
57  uint64_t back_ptr;
58 // uint64_t global_key_pts;
59  int64_t ts;
60 } Syncpoint;
61 
62 typedef struct FrameCode {
63  uint16_t flags;
65  uint16_t size_mul;
66  uint16_t size_lsb;
67  int16_t pts_delta;
70 } FrameCode;
71 
72 typedef struct StreamContext {
75  int64_t last_pts;
80  int decode_delay; //FIXME duplicate of has_b_frames
81  int64_t *keyframe_pts;
83 
84 typedef struct ChapterContext {
87 
88 typedef struct NUTContext {
90 // int written_packet_size;
91 // int64_t packet_start;
94  const uint8_t *header[128];
95  uint64_t next_startcode; ///< stores the next startcode if it has already been parsed but the stream is not seekable
98  unsigned int max_distance;
99  unsigned int time_base_count;
104  int sp_count;
105  int64_t max_pts;
107 } NUTContext;
108 
109 extern const AVCodecTag ff_nut_subtitle_tags[];
110 extern const AVCodecTag ff_nut_video_tags[];
111 extern const AVCodecTag ff_nut_audio_tags[];
112 extern const AVCodecTag ff_nut_data_tags[];
113 
114 extern const AVCodecTag * const ff_nut_codec_tags[];
115 
116 typedef struct Dispositions {
117  char str[9];
118  int flag;
119 } Dispositions;
120 
121 void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);
122 int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);
123 int ff_nut_sp_pos_cmp(const Syncpoint *a, const Syncpoint *b);
124 int ff_nut_sp_pts_cmp(const Syncpoint *a, const Syncpoint *b);
125 int ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);
126 void ff_nut_free_sp(NUTContext *nut);
127 
128 extern const Dispositions ff_nut_dispositions[];
129 
130 extern const AVMetadataConv ff_nut_metadata_conv[];
131 
132 #endif /* AVFORMAT_NUT_H */