244 lines
7.8 KiB
C
244 lines
7.8 KiB
C
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/******************************************************************************
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Copyright (C) Microsoft Corporation 1985 - 1995. All rights reserved.
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AVIIDX.H - AVI Index stuff
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*****************************************************************************/
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#ifndef _INC_AVIFMT
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#include <vfw.h>
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#endif
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#ifndef EXTERN_C
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#ifdef __cplusplus
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#define EXTERN_C extern "C"
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#else
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#define EXTERN_C extern
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#endif
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#endif
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#define ERR_POS (-100) // bad position
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#define ERR_IDX (-1) // bad index
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typedef AVIINDEXENTRY _huge *PAVIINDEXENTRY;
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// to some customers, this 1Gb limit is not worth the few bytes it saves.
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#ifndef _WIN32
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//
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// this is the in memory form of a AVI INDEX, we want this to be 8 bytes
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// to save memory.
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//
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// the bit fields may not be portable, so a new structure will be needed.
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//
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// we always access via macros, so changing the structure should be posible
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//
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// this stucture sotres the following:
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//
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// offset 0-1GB (30 bits) we assume even number so only need 29bits
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// flags (4 bits)
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// stream 0-127 (7 bits)
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// length 0-4MB (24 bits)
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//
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#pragma pack(1)
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typedef union {
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struct {
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DWORD offset; // 0-1GB
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DWORD length; // 0-4MB
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};
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struct {
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BYTE ack[3]; // 24 bits of the offset
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WORD flags; // access to all flags
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BYTE smag[3]; // length (24 bits)
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};
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#if 0 // I hate bit-fields
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struct {
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DWORD offset:29; // 0-1GB
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DWORD key:1;
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DWORD nonkey:1;
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DWORD pal:1;
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DWORD stream:7; // 0-127
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DWORD half:1;
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DWORD length:24; // 0-4MB
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};
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#endif
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} AVIIDX;
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#pragma pack()
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//
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// limits
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//
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#define MAX_OFFSET (1l<<30)
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#define MAX_LENGTH (1l<<24)
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#define MAX_STREAM (1l<<7)
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//
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// index flags
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//
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#define IDX_OFFHI 0x001F // hi part of offset.
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#define IDX_KEY 0x0020 // key frame
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#define IDX_NONKEY 0x0040 // not a key frame (but not blank either)
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#define IDX_PAL 0x0080 // palette change
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#define IDX_STREAM 0x7F00 // stream number
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#define IDX_HALF 0x8000 // RLE half frame.
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#define IDX_NOTIME IDX_PAL
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//
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// macros to acces index to help porting
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//
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#define Index(px, lx) ((AVIIDX _huge *)px)[lx+1]
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#define IndexOffset(px, lx) (LONG)((Index(px,lx).offset & 0x1FFFFFFF) * 2)
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#define IndexLength(px, lx) (LONG)((Index(px,lx).length) >> 8)
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#define IndexStream(px, lx) (BYTE)((Index(px,lx).flags & IDX_STREAM) >> 8)
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#define IndexFlags(px, lx) (UINT)(Index(px,lx).flags)
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#define IndexSetOffset(px, lx, x) { Index(px,lx).offset &= ~0x1FFFFFFF; Index(px,lx).offset |= (DWORD)(x)>>1; }
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#define IndexSetLength(px, lx, x) { Index(px,lx).length &= ~0xFFFFFF00; Index(px,lx).length |= (DWORD)(x)<<8; }
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#define IndexSetStream(px, lx, x) { Index(px,lx).flags &= ~IDX_STREAM; Index(px,lx).flags |= (DWORD)(x)<<8; }
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#define IndexSetFlags(px, lx, x) { Index(px,lx).flags &= IDX_STREAM|IDX_OFFHI; Index(px,lx).flags |= (UINT)(x); }
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#define IndexSetKey(px, lx) { Index(px,lx).flags |= IDX_KEY; Index(px,lx).flags &= ~(IDX_NONKEY); }
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#else // --- 4Gb version of index macros ----------------------------------
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typedef struct {
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WORD flags;
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WORD stream;
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DWORD offset;
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long length;
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} AVIIDX;
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//
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// limits
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//
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#define MAX_OFFSET ((DWORD)0xffffffff) // signed in some places ??
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#define MAX_LENGTH (1l<<30)
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#define MAX_STREAM (1l<<16)
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//
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// index flags
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//
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#define IDX_KEY 0x0020 // key frame
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#define IDX_NONKEY 0x0040 // not a key frame (but not blank either)
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#define IDX_PAL 0x0080 // palette change
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#define IDX_HALF 0x8000 // RLE half frame.
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#define IDX_NOTIME IDX_PAL
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//
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// macros to acces index to help porting
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//
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#define Index(px, lx) (px)->idx[lx]
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#define IndexOffset(px, lx) (Index(px,lx).offset)
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#define IndexLength(px, lx) (Index(px,lx).length)
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#define IndexStream(px, lx) (Index(px,lx).stream)
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#define IndexFlags(px, lx) (Index(px,lx).flags)
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#define IndexSetOffset(px, lx, x) { Index(px,lx).offset = (DWORD)(x); }
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#define IndexSetLength(px, lx, x) { Index(px,lx).length = (long)(x); }
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#define IndexSetStream(px, lx, x) { Index(px,lx).stream = (WORD)(x); }
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#define IndexSetFlags(px, lx, x) { Index(px,lx).flags = (WORD)(x); }
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#define IndexSetKey(px, lx) { Index(px,lx).flags |= IDX_KEY; Index(px,lx).flags &= ~(IDX_NONKEY); }
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#endif //------------------------------------------------------------------
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//
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// special streams
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//
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#define STREAM_REC 0x7F // interleave records.
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//
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// this is the header we put on a list of AVIIDX entries.
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//
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#pragma warning(disable:4200)
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typedef struct
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{
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LONG nIndex; // number of entries in index
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LONG nIndexSize; // alocated size
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AVIIDX idx[]; // the entries.
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} AVIINDEX, _huge *PAVIINDEX;
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//
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// AVI Stream Index
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//
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typedef LONG (FAR PASCAL *STREAMIOPROC)(HANDLE hFile, LONG off, LONG cb, LPVOID p);
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typedef struct
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{
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UINT stream; // stream number
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UINT flags; // combination of all flags in index.
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PAVIINDEX px; // main index
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LONG lx; // Index index
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LONG lPos; // index position
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LONG lxStart; // Index start
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LONG lStart; // start of stream
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LONG lEnd; // end of stream
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LONG lMaxSampleSize; // largest sample
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LONG lSampleSize; // sample size for stream
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LONG lFrames; // total "frames"
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LONG lKeyFrames; // total key "frames"
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LONG lPalFrames; // total pal "frames"
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LONG lNulFrames; // total nul "frames"
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HANDLE hFile;
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STREAMIOPROC Read;
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STREAMIOPROC Write;
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} STREAMINDEX, *PSTREAMINDEX;
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//
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// create and free a index.
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//
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EXTERN_C PAVIINDEX IndexCreate(void);
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#define FreeIndex(px) GlobalFreePtr(px)
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//
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// convert to and from a file index
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//
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EXTERN_C PAVIINDEX IndexAddFileIndex(PAVIINDEX px, AVIINDEXENTRY _huge *pidx, LONG cnt, LONG lAdjust, BOOL fRle);
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EXTERN_C LONG IndexGetFileIndex(PAVIINDEX px, LONG l, LONG cnt, PAVIINDEXENTRY pidx, LONG lAdjust);
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EXTERN_C PSTREAMINDEX MakeStreamIndex(PAVIINDEX px, UINT stream, LONG lStart, LONG lSampleSize, HANDLE hFile, STREAMIOPROC ReadProc, STREAMIOPROC WriteProc);
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#define FreeStreamIndex(psx) LocalFree((HLOCAL)psx)
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//
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// index access functions
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//
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EXTERN_C LONG IndexFirst(PAVIINDEX px, UINT stream);
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EXTERN_C LONG IndexNext (PAVIINDEX px, LONG lx, UINT f);
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EXTERN_C LONG IndexPrev (PAVIINDEX px, LONG lx, UINT f);
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//
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// search index for data
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//
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#ifndef FIND_DIR
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#define FIND_DIR 0x0000000FL // direction
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#define FIND_NEXT 0x00000001L // go forward
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#define FIND_PREV 0x00000004L // go backward
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#define FIND_FROM_START 0x00000008L // start at the logical beginning
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#define FIND_TYPE 0x000000F0L // type mask
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#define FIND_KEY 0x00000010L // find key frame.
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#define FIND_ANY 0x00000020L // find any (non-empty) sample
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#define FIND_FORMAT 0x00000040L // find format change
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#endif
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#ifndef FIND_RET
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#define FIND_RET 0x0000F000L // return mask
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#define FIND_POS 0x00000000L // return logical position
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#define FIND_LENGTH 0x00001000L // return logical size
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#define FIND_OFFSET 0x00002000L // return physical position
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#define FIND_SIZE 0x00003000L // return physical size
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#define FIND_INDEX 0x00004000L // return physical index position
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#endif
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EXTERN_C LONG StreamFindSample(PSTREAMINDEX psx, LONG lPos, UINT f);
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EXTERN_C LONG StreamRead(PSTREAMINDEX psx, LONG lStart, LONG lSamples, LPVOID lpBuffer, LONG cbBuffer);
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EXTERN_C LONG StreamWrite(PSTREAMINDEX psx, LONG lStart, LONG lSamples, LPVOID lpBuffer, LONG cbBuffer);
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