Aegisub/src/MatroskaParser.h

/*
 * Copyright (c) 2004-2009 Mike Matsnev.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Absolutely no warranty of function or purpose is made by the author
 *    Mike Matsnev.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef MATROSKA_PARSER_H
#define	MATROSKA_PARSER_H

/* Random notes:
 *
 * The parser does not process frame data in any way and does not read it into
 * the queue. The app should read it via mkv_ReadData if it is interested.
 *
 * The code here is 64-bit clean and was tested on FreeBSD/sparc 64-bit big endian
 * system
 */

#ifdef MPDLLBUILD
#define	X __declspec(dllexport)
#else
#ifdef MPDLL
#define X __declspec(dllimport)
#pragma comment(lib,"MatroskaParser")
#else
#define X
#endif
#endif

#define MATROSKA_COMPRESSION_SUPPORT
#define	MATROSKA_INTEGER_ONLY

#ifdef __cplusplus
extern "C" {
#endif

/* 64-bit integers */
#ifdef _WIN32_WCE
typedef signed __int64	    longlong;
typedef unsigned __int64    ulonglong;
#else
typedef signed long long    longlong;
typedef unsigned long long  ulonglong;
#endif

/* MKFLOATing point */
#ifdef MATROSKA_INTEGER_ONLY
typedef struct {
  longlong	v;
} MKFLOAT;
#else
typedef	double	MKFLOAT;
#endif

/* generic I/O */
struct InputStream {
  /* read bytes from stream */
  int	      (*read)(struct InputStream *cc,ulonglong pos,void *buffer,int count);
  /* scan for a four byte signature, bytes must be nonzero */
  longlong    (*scan)(struct InputStream *cc,ulonglong start,unsigned signature);
  /* get cache size, this is used to cap readahead */
  unsigned    (*getcachesize)(struct InputStream *cc);
  /* fetch last error message */
  const char *(*geterror)(struct InputStream *cc);
  /* memory allocation */
  void	      *(*memalloc)(struct InputStream *cc,size_t size);
  void	      *(*memrealloc)(struct InputStream *cc,void *mem,size_t newsize);
  void	      (*memfree)(struct InputStream *cc,void *mem);
  /* zero return causes parser to abort open */
  int	      (*progress)(struct InputStream *cc,ulonglong cur,ulonglong max);
  /* get file size, optional, can be NULL or return -1 if filesize is unknown */
  longlong    (*getfilesize)(struct InputStream *cc);
};

typedef struct InputStream InputStream;

/* matroska file */
struct MatroskaFile; /* opaque */

typedef struct MatroskaFile MatroskaFile;

#define	COMP_ZLIB   0
#define	COMP_BZIP   1
#define	COMP_LZO1X  2
#define	COMP_PREPEND 3

#define	TT_VIDEO    1
#define	TT_AUDIO    2
#define	TT_SUB	    17

struct TrackInfo {
  unsigned char	  Number;
  unsigned char	  Type;
  unsigned char	  TrackOverlay;
  ulonglong	  UID;
  ulonglong	  MinCache;
  ulonglong	  MaxCache;
  ulonglong	  DefaultDuration;
  MKFLOAT	  TimecodeScale;
  void		  *CodecPrivate;
  unsigned	  CodecPrivateSize;
  unsigned	  CompMethod;
  void		  *CompMethodPrivate;
  unsigned	  CompMethodPrivateSize;
  unsigned	  MaxBlockAdditionID;

  unsigned int  Enabled:1;
  unsigned int  Default:1;
  unsigned int  Lacing:1;
  unsigned int  DecodeAll:1;
  unsigned int  CompEnabled:1;

  union {
    struct {
      unsigned char   StereoMode;
      unsigned char   DisplayUnit;
      unsigned char   AspectRatioType;
      unsigned int    PixelWidth;
      unsigned int    PixelHeight;
      unsigned int    DisplayWidth;
      unsigned int    DisplayHeight;
      unsigned int    CropL, CropT, CropR, CropB;
      unsigned int    ColourSpace;
      MKFLOAT	      GammaValue;

      unsigned int  Interlaced:1;
    } Video;
    struct {
      MKFLOAT	      SamplingFreq;
      MKFLOAT	      OutputSamplingFreq;
      unsigned char   Channels;
      unsigned char   BitDepth;
    } Audio;
  } AV;

  /* various strings */
  char			*Name;
  char			Language[4];
  char			*CodecID;
};

typedef struct TrackInfo  TrackInfo;

struct SegmentInfo {
  char			UID[16];
  char			PrevUID[16];
  char			NextUID[16];
  char			*Filename;
  char			*PrevFilename;
  char			*NextFilename;
  char			*Title;
  char			*MuxingApp;
  char			*WritingApp;
  ulonglong		TimecodeScale;
  ulonglong		Duration;
  longlong		DateUTC;
  char			DateUTCValid;
};

typedef struct SegmentInfo SegmentInfo;

struct Attachment {
  ulonglong		Position;
  ulonglong		Length;
  ulonglong		UID;
  char			*Name;
  char			*Description;
  char			*MimeType;
};

typedef struct Attachment Attachment;

struct ChapterDisplay {
  char			*String;
  char			Language[4];
  char			Country[4];
};

struct ChapterCommand {
  unsigned		Time;
  unsigned		CommandLength;
  void			*Command;
};

struct ChapterProcess {
  unsigned		CodecID;
  unsigned		CodecPrivateLength;
  void			*CodecPrivate;
  unsigned		nCommands,nCommandsSize;
  struct ChapterCommand	*Commands;
};

struct Chapter {
  ulonglong		UID;
  ulonglong		Start;
  ulonglong		End;

  unsigned		nTracks,nTracksSize;
  ulonglong		*Tracks;
  unsigned		nDisplay,nDisplaySize;
  struct ChapterDisplay	*Display;
  unsigned		nChildren,nChildrenSize;
  struct Chapter	*Children;
  unsigned		nProcess,nProcessSize;
  struct ChapterProcess	*Process;

  char			SegmentUID[16];

  unsigned int	Hidden:1;
  unsigned int	Enabled:1;

  // Editions
  unsigned int	Default:1;
  unsigned int	Ordered:1;
};

typedef struct Chapter	Chapter;

#define	TARGET_TRACK	  0
#define	TARGET_CHAPTER	  1
#define	TARGET_ATTACHMENT 2
#define	TARGET_EDITION	  3
struct Target {
  ulonglong	    UID;
  unsigned	    Type;
};

struct SimpleTag {
  char		    *Name;
  char		    *Value;
  char		    Language[4];
  unsigned	    Default:1;
};

struct Tag {
  unsigned	    nTargets,nTargetsSize;
  struct Target	    *Targets;

  unsigned	    nSimpleTags,nSimpleTagsSize;
  struct SimpleTag  *SimpleTags;
};

typedef struct Tag  Tag;

/* Open a matroska file
 * io pointer is recorded inside MatroskaFile
 */
X MatroskaFile  *mkv_Open(/* in */ InputStream *io,
			/* out */ char *err_msg,
			/* in */  unsigned msgsize);

#define	MKVF_AVOID_SEEKS    1 /* use sequential reading only */

X MatroskaFile  *mkv_OpenEx(/* in */  InputStream *io,
			  /* in */  ulonglong base,
			  /* in */  unsigned flags,
			  /* out */ char *err_msg,
			  /* in */  unsigned msgsize);

/* Close and deallocate mf
 * NULL pointer is ok and is simply ignored
 */
X void		mkv_Close(/* in */ MatroskaFile *mf);

/* Fetch the error message of the last failed operation */
X const char    *mkv_GetLastError(/* in */ MatroskaFile *mf);

/* Get file information */
X SegmentInfo   *mkv_GetFileInfo(/* in */ MatroskaFile *mf);

/* Get track information */
X unsigned int  mkv_GetNumTracks(/* in */ MatroskaFile *mf);
X TrackInfo     *mkv_GetTrackInfo(/* in */ MatroskaFile *mf,/* in */ unsigned track);

/* chapters, tags and attachments */
X void	      mkv_GetAttachments(/* in */   MatroskaFile *mf,
				 /* out */  Attachment **at,
				 /* out */  unsigned *count);
X void	      mkv_GetChapters(/* in */	MatroskaFile *mf,
			      /* out */	Chapter **ch,
			      /* out */ unsigned *count);
X void	      mkv_GetTags(/* in */  MatroskaFile *mf,
			  /* out */ Tag **tag,
			  /* out */ unsigned *count);

X ulonglong   mkv_GetSegmentTop(MatroskaFile *mf);

/* Seek to specified timecode,
 * if timecode is past end of file,
 * all tracks are set to return EOF
 * on next read
 */
#define	MKVF_SEEK_TO_PREV_KEYFRAME          1
#define	MKVF_SEEK_TO_PREV_KEYFRAME_STRICT   2

X void	      mkv_Seek(/* in */ MatroskaFile *mf,
		       /* in */	ulonglong timecode /* in ns */,
		       /* in */ unsigned flags);

X void	      mkv_SkipToKeyframe(MatroskaFile *mf);

X ulonglong   mkv_GetLowestQTimecode(MatroskaFile *mf);

X int	      mkv_TruncFloat(MKFLOAT f);

/*************************************************************************
 * reading data, pull model
 */

/* frame flags */
#define	FRAME_UNKNOWN_START   0x00000001
#define	FRAME_UNKNOWN_END     0x00000002
#define	FRAME_KF	      0x00000004
#define	FRAME_GAP	      0x00800000
#define	FRAME_STREAM_MASK     0xff000000
#define	FRAME_STREAM_SHIFT    24

/* This sets the masking flags for the parser,
 *  masked tracks [with 1s in their bit positions]
 *  will be ignored when reading file data.
 * This call discards all parsed and queued frames
 */
X void	      mkv_SetTrackMask(/* in */ MatroskaFile *mf,/* in */ unsigned int mask);

/* Read one frame from the queue.
 * mask specifies what tracks to ignore.
 * Returns -1 if there are no more frames in the specified
 * set of tracks, 0 on success
 */
X int	      mkv_ReadFrame(/* in */  MatroskaFile *mf,
			    /* in */  unsigned int mask,
			    /* out */ unsigned int *track,
			    /* out */ ulonglong *StartTime /* in ns */,
			    /* out */ ulonglong *EndTime /* in ns */,
			    /* out */ ulonglong *FilePos /* in bytes from start of file */,
			    /* out */ unsigned int *FrameSize /* in bytes */,
			    /* out */ unsigned int *FrameFlags);

#ifdef MATROSKA_COMPRESSION_SUPPORT
/* Compressed streams support */
struct CompressedStream;

typedef struct CompressedStream CompressedStream;

X CompressedStream  *cs_Create(/* in */	MatroskaFile *mf,
			     /* in */	unsigned tracknum,
			     /* out */	char *errormsg,
			     /* in */	unsigned msgsize);
X void		  cs_Destroy(/* in */ CompressedStream *cs);

/* advance to the next frame in matroska stream, you need to pass values returned
 * by mkv_ReadFrame */
X void		  cs_NextFrame(/* in */ CompressedStream *cs,
			       /* in */ ulonglong pos,
			       /* in */ unsigned size);

/* read and decode more data from current frame, return number of bytes decoded,
 * 0 on end of frame, or -1 on error */
X int		  cs_ReadData(CompressedStream *cs,char *buffer,unsigned bufsize);

/* return error message for the last error */
X const char	  *cs_GetLastError(CompressedStream *cs);
#endif

#ifdef __cplusplus
}
#endif

#undef X

#endif