mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
97 lines
3.5 KiB
97 lines
3.5 KiB
/* |
|
* "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 dont 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 alraedy been parsed but the stream isnt 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); |
|
}
|
|
|