2 * "NUT" Container Format (de)muxer
3 * Copyright (c) 2006 Michael Niedermayer
5 * This file is part of FFmpeg.
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.
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.
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
26 //#include "mpegaudio.h"
28 //#include "adler32.h"
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))
36 #define ID_STRING "nut/multimedia container\0"
38 #define MAX_DISTANCE (1024*32-1)
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.
55 // uint64_t global_key_pts;
65 uint8_t reserved_count;
66 } FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix
70 int skip_until_key_frame;
76 int decode_delay; //FIXME duplicate of has_b_frames
77 } StreamContext;// maybe s/StreamContext/streamcontext_t/
81 // int written_packet_size;
82 // int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
83 FrameCode frame_code[256];
84 uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
85 StreamContext *stream;
86 unsigned int max_distance;
87 unsigned int time_base_count;
88 int64_t last_syncpoint_pos;
89 AVRational *time_base;
90 struct AVTreeNode *syncpoints;
94 //FIXME move to a common spot, like crc.c/h
95 static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
96 return av_crc(av_crc04C11DB7, checksum, buf, len);