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