updating nut demuxer to latest spec
[libav.git] / libavformat / nut.h
CommitLineData
619d8e2e
MN
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
23//#include <limits.h>
24#include "avformat.h"
25#include "crc.h"
26//#include "mpegaudio.h"
27#include "riff.h"
28//#include "adler32.h"
29
30#define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
31#define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
32#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
33#define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
34#define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
35
36#define ID_STRING "nut/multimedia container\0"
37
38#define MAX_DISTANCE (1024*32-1)
39
40typedef enum{
41 FLAG_KEY = 1, ///<if set, frame is keyframe
42 FLAG_EOR = 2, ///<if set, stream has no relevance on presentation. (EOR)
43 FLAG_CODED_PTS = 8, ///<if set, coded_pts is in the frame header
44 FLAG_STREAM_ID = 16, ///<if set, stream_id is coded in the frame header
45 FLAG_SIZE_MSB = 32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
46 FLAG_CHECKSUM = 64, ///<if set then the frame header contains a checksum
47 FLAG_RESERVED = 128, ///<if set, reserved_count is coded in the frame header
48 FLAG_CODED =4096, ///<if set, coded_flags are stored in the frame header.
49 FLAG_INVALID =8192, ///<if set, frame_code is invalid.
50}flag_t;
51
52typedef struct {
53 uint32_t pos; //64gb limit if div16 (change this to 64 if thats too little)
54 uint64_t global_key_pts;
55 uint32_t back_ptr_div16; //is stored /16
56} syncpoint_t;
57
58typedef struct {
59 uint16_t flags;
60 uint8_t stream_id;
61 uint16_t size_mul;
62 uint16_t size_lsb;
63 int16_t pts_delta;
64 uint8_t reserved_count;
65} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix
66
67typedef struct {
68 int last_key_frame; ///<was the last frame a keyfraeme
69 int64_t last_pts;
70 int time_base_id;
71 AVRational time_base;
72 int msb_pts_shift;
73 int max_pts_distance;
74 int decode_delay; //FIXME duplicate of has_b_frames
75} StreamContext;// maybe s/StreamContext/streamcontext_t/
76
77typedef struct {
78 AVFormatContext *avf;
79// int written_packet_size;
80// int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
81 FrameCode frame_code[256];
82 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
83 StreamContext *stream;
84 unsigned int max_distance;
85 unsigned int time_base_count;
86 int64_t last_syncpoint_pos;
87 AVRational *time_base;
88} NUTContext;
89
90
91//FIXME move to a common spot, like crc.c/h
92static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
93 return av_crc(av_crc04C11DB7, checksum, buf, len);
94}