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ffmpeg / libavformat / nut.h @ 755bfeab

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/*
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 * "NUT" Container Format (de)muxer
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 * Copyright (c) 2006 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
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//#include <limits.h>
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#include "avformat.h"
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#include "crc.h"
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//#include "mpegaudio.h"
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#include "riff.h"
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//#include "adler32.h"
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#define      MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
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#define    STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
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#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
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#define     INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
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#define      INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
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#define ID_STRING "nut/multimedia container\0"
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#define MAX_DISTANCE (1024*32-1)
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typedef enum{
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    FLAG_KEY        =   1, ///<if set, frame is keyframe
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    FLAG_EOR        =   2, ///<if set, stream has no relevance on presentation. (EOR)
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    FLAG_CODED_PTS  =   8, ///<if set, coded_pts is in the frame header
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    FLAG_STREAM_ID  =  16, ///<if set, stream_id is coded in the frame header
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    FLAG_SIZE_MSB   =  32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0
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    FLAG_CHECKSUM   =  64, ///<if set then the frame header contains a checksum
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    FLAG_RESERVED   = 128, ///<if set, reserved_count is coded in the frame header
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    FLAG_CODED      =4096, ///<if set, coded_flags are stored in the frame header.
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    FLAG_INVALID    =8192, ///<if set, frame_code is invalid.
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}flag_t;
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typedef struct {
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    uint64_t pos;
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    uint64_t back_ptr;
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//    uint64_t global_key_pts;
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    int64_t ts;
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} syncpoint_t;
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typedef struct {
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    uint16_t flags;
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    uint8_t  stream_id;
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    uint16_t size_mul;
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    uint16_t size_lsb;
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    int16_t  pts_delta;
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    uint8_t  reserved_count;
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} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to Java style but do not mix
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typedef struct {
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    int last_flags;
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    int skip_until_key_frame;
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    int64_t last_pts;
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    int time_base_id;
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    AVRational time_base;
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    int msb_pts_shift;
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    int max_pts_distance;
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    int decode_delay; //FIXME duplicate of has_b_frames
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} StreamContext;// maybe s/StreamContext/streamcontext_t/
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typedef struct {
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    AVFormatContext *avf;
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//    int written_packet_size;
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//    int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
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    FrameCode frame_code[256];
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    uint64_t next_startcode;     ///< stores the next startcode if it has already been parsed but the stream is not seekable
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    StreamContext *stream;
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    unsigned int max_distance;
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    unsigned int time_base_count;
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    int64_t last_syncpoint_pos;
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    AVRational *time_base;
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    struct AVTreeNode *syncpoints;
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} NUTContext;
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//FIXME move to a common spot, like crc.c/h
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static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
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    return av_crc(av_crc04C11DB7, checksum, buf, len);
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}