PeerStreamer

/*

 * "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

 */

#ifndef AVFORMAT_NUT_H

#define AVFORMAT_NUT_H

//#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, 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;

    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;

    int header_count;

    AVRational *time_base;

    struct AVTreeNode *syncpoints;

} NUTContext;

unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len);

void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val);

int64_t ff_lsb2full(StreamContext *stream, int64_t lsb);

int ff_nut_sp_pos_cmp(syncpoint_t *a, syncpoint_t *b);

int ff_nut_sp_pts_cmp(syncpoint_t *a, syncpoint_t *b);

void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts);

#endif /* AVFORMAT_NUT_H */