619d8e2e58
no muxing yet no index yet no seeking yet libnuts crcs dont match mine (didnt investigate yet) samplerate is stored wrong by libnut (demuxer has a workaround) code is not clean or beautifull yet, but i thought its better to commit early before someone unneccesarily wastes his time duplicating the work demuxer split from muxer Originally committed as revision 6966 to svn://svn.ffmpeg.org/ffmpeg/trunk
95 lines
3.6 KiB
C
95 lines
3.6 KiB
C
/*
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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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uint32_t pos; //64gb limit if div16 (change this to 64 if thats too little)
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uint64_t global_key_pts;
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uint32_t back_ptr_div16; //is stored /16
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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 dont mix
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typedef struct {
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int last_key_frame; ///<was the last frame a keyfraeme
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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 alraedy been parsed but the stream isnt 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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} 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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}
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