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NT4/private/windows/media/avi/avifile.16/avilib.cpp

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2001-01-01 00:00:00 +01:00
/****************************************************************************
*
* AVILIB.CPP
*
* routines for reading a AVIStream
*
* Copyright (c) 1992 Microsoft Corporation. All Rights Reserved.
*
* You have a royalty-free right to use, modify, reproduce and
* distribute the Sample Files (and/or any modified version) in
* any way you find useful, provided that you agree that
* Microsoft has no warranty obligations or liability for any
* Sample Application Files which are modified.
*
***************************************************************************/
#include <win32.h>
#include <compobj.h>
#include <compman.h>
#include <shellapi.h>
#include <memory.h> // for _fmemset
#include "avifile.h"
#include "aviopts.h" // string resources
#include "avireg.h"
#include "debug.h"
#ifndef WIN32
#undef HKEY_CLASSES_ROOT
#define HKEY_CLASSES_ROOT 0x00000001
#endif
#define ValidPAVI(pavi) (pavi != NULL)
#define V_PAVI(pavi, err) \
if (!ValidPAVI(pavi)) \
return err;
/****************************************************************************
strings
****************************************************************************/
#define SZCODE char _based(_segname("_CODE"))
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
EXTERN_C HINSTANCE ghMod;
static int iInit = 0;
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
/**************************************************************************
* @doc INTERNAL InitRegistry()
*
* @api void | write all the default AVIFile/AVIStream handlers to the
* registry.
*
* @comm This function should be enhanced so that some of the key values
* can be loaded from resources, instead of a static string table....
*
* @xref AVIStreamInit
*
*************************************************************************/
static void InitRegistry()
{
char **ppch = aszReg;
char ach[80];
#ifndef DEBUG
LONG cb;
// !!! This should have a version number or something in it....
if (RegQueryValue(HKEY_CLASSES_ROOT, ppch[0], ach, (cb = sizeof(ach),&cb)) == ERROR_SUCCESS &&
lstrcmpi(ach, ppch[1]) == 0)
return;
#endif
while (ppch[0])
{
if (((UINT) ppch[1]) < MAX_RC_CONSTANT) {
LoadString(ghMod, (UINT) ppch[1], ach, sizeof(ach));
RegSetValue(HKEY_CLASSES_ROOT, ppch[0], REG_SZ, ach, 0L);
} else
RegSetValue(HKEY_CLASSES_ROOT, ppch[0], REG_SZ, ppch[1], 0L);
ppch += 2;
}
}
/**************************************************************************
* @doc EXTERNAL AVIFileInit
*
* @api void | AVIFileInit | This function initalizes the AVIFILE library.
*
* @comm Call this function before using any other AVIFILE functions.
*
* @xref <f AVIFileExit>
*
*************************************************************************/
STDAPI_(void) AVIFileInit()
{
iInit++;
CoInitialize(NULL);
if (iInit == 1) {
InitRegistry();
}
}
/**************************************************************************
* @doc EXTERNAL AVIFileExit
*
* @api void | AVIFileExit | This function exits the AVIFILE library.
*
* @comm Call this function after using any other AVIFILE functions.
*
* @xref <f AVIFileInit>
*
*************************************************************************/
STDAPI_(void) AVIFileExit()
{
extern HINSTANCE ghOLE2;
iInit--;
CoFreeUnusedLibraries();
CoUninitialize();
if (iInit == 0){
if (ghOLE2) {
DPF("Freeing OLE2.DLL\n");
FreeLibrary(ghOLE2);
ghOLE2 = NULL;
}
}
}
/**************************************************************************
* @doc INTERNAL AVIFileCreate
*
* @api LONG | AVIFileCreate | Initializes an empty AVI File interface
* pointer.
*
* @parm PAVIFILE FAR * | ppfile | Pointer to where the new <t PAVIFILE>
* should be returned.
*
* @parm LONG | lParam | Specifies a parameter passed to the handler.
*
* @parm CLSID FAR * | pclsidHandler | Specifies a pointer to a
* class ID used to create the file.
*
* @devnote Nobody should have to call this function, because AVIFileOpen
* does it. In fact, why do we even have this?
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref AVIFileOpen
*
*************************************************************************/
STDAPI AVIFileCreate (PAVIFILE FAR *ppfile, LONG lParam,
CLSID FAR *pclsidHandler)
{
CLSID clsid;
HRESULT hr;
if (!iInit) {
return ResultFromScode(CO_E_NOTINITIALIZED);
}
// AVIStreamInit();
if (pclsidHandler)
clsid = *pclsidHandler;
else {
// if (pfh == NULL)
// pfh = &AVIFFileHandler;
}
if (FAILED(GetScode(hr = CoCreateInstance((REFCLSID) clsid,
NULL, CLSCTX_INPROC,
(REFIID) IID_IAVIFile,
(void FAR* FAR*)ppfile))))
return hr; // !!! PropagateHResult?
return AVIERR_OK;
}
// Remove trailing spaces after a file...
void FixFourCC(LPSTR lp)
{
int i;
for (i = 3; i >= 0; i--) {
if (lp[i] == ' ')
lp[i] = '\0';
else
break;
}
}
// Returns a pointer to the extension of a filename....
LPCSTR FindExtension(LPCSTR lp)
{
LPCSTR lpExt = lp;
int i;
// Goto end of string
while (*lpExt != '\0')
{
++lpExt;
}
// Must be at least 2 characters in string
if (lpExt - lp < 2)
return NULL;
lpExt -= 1;
// Does not count if last character is '.'
if (*lpExt == '.')
return NULL;
lpExt -= 1;
// Now looking at second to the last character. Check this and the two
// previous characters for a '.'
for (i=1; i<=3; ++i)
{
// Cannot have path separator here
if (*lpExt == '/' || *lpExt == '\\')
return NULL;
if (*lpExt == '.')
{
++lpExt;
return lpExt;
}
if (lpExt == lp)
return NULL;
--lpExt;
}
return NULL;
}
/**************************************************************************
* @doc INTERNAL GetHandlerFromFile
*
* @api PAVIFILEHANDLER | GetHandlerFromFile | Figure out what handler
* to use for a file by looking at its extension, its RIFF type,
* and possibly other things.
*
* @parm LPCSTR | szFile | The file to look at.
*
* @parm CLSID FAR * | pclsidHandler | Pointer to a classID.
*
* @comm We don't look at the extensions yet. We need a better way to
* add handlers.
*
* @rdesc Returns the <PAVIFILEHANDLER> to use, or NULL if it can't find
* one.
*
* @xref AVIFileOpen AVIRegisterLoader
*
*************************************************************************/
#define HKEY_AVIFILE_ROOT HKEY_CLASSES_ROOT
static SZCODE aszRegRIFF[] = "AVIFile\\RIFFHandlers\\%.4s";
static SZCODE aszRegExt[] = "AVIFile\\Extensions";
static SZCODE aszRegClsid[] = "Clsid";
static SZCODE aszRegExtTmpl[] = "%s\\%.3s";
BOOL GetHandlerFromFile(LPCSTR szFile, CLSID FAR *pclsid)
{
DWORD dw[3];
HMMIO hmmio;
LPCSTR lpExt;
char achKey[100];
char achClass[100];
LONG lcbClass;
// I hate share
hmmio = mmioOpen((LPSTR) szFile, NULL, MMIO_READ | MMIO_DENYWRITE);
if (hmmio == NULL)
hmmio = mmioOpen((LPSTR) szFile, NULL, MMIO_READ | MMIO_DENYNONE);
if (hmmio == NULL)
hmmio = mmioOpen((LPSTR) szFile, NULL, MMIO_READ);
if (hmmio == NULL)
goto UseExtension;
if (mmioRead(hmmio, (HPSTR) dw, sizeof(dw)) != sizeof(dw)) {
mmioClose(hmmio, 0);
goto UseExtension;
}
mmioClose(hmmio, 0);
if (dw[0] != FOURCC_RIFF)
goto UseExtension;
FixFourCC((LPSTR) &dw[2]);
// Look up the RIFF type in the registration database....
wsprintf(achKey, aszRegRIFF, (LPSTR) &dw[2]);
lcbClass = sizeof(achClass);
RegQueryValue(HKEY_CLASSES_ROOT, achKey, achClass, &lcbClass);
if (!FAILED(GetScode(CLSIDFromString(achClass, pclsid))))
return TRUE;
UseExtension:
lpExt = FindExtension(szFile);
if (lpExt) {
// Look up the extension in the registration database....
wsprintf(achKey, aszRegExtTmpl, (LPSTR) aszRegExt, lpExt);
lcbClass = sizeof(achClass);
RegQueryValue(HKEY_CLASSES_ROOT, achKey, achClass, &lcbClass);
if (!FAILED(GetScode(CLSIDFromString(achClass, pclsid))))
return TRUE;
}
// !!! Use IStorage?
return FALSE;
}
/**************************************************************************
* @doc EXTERNAL AVIFileOpen
*
* @api LONG | AVIFileOpen | Opens an AVI file and returns a file interface
* pointer used to access it.
*
* @parm PAVIFILE FAR * | ppfile | Pointer to the location used to return
* the new <t PAVIFILE> file pointer.
*
* @parm LPCSTR | szFile | Specifies a zero-terminated string
* containing the name of the file to open.
*
* @parm UINT | mode | Specifies the mode to use when opening the file.
*
*
* @flag OF_READ | Opens the file for reading only. This is the
* default, if OF_WRITE and OF_READWRITE are not specified.
*
* @flag OF_WRITE | Opens the file for writing. You should not
* read from a file opened in this mode.
*
* @flag OF_READWRITE | Opens the file for both reading and writing.
*
* @flag OF_CREATE | Creates a new file.
* If the file already exists, it is truncated to zero length.
*
* @flag OF_DENYWRITE | Opens the file and denies other
* processes write access to the file. <f AVIFileOpen> fails
* if the file has been opened in compatibility or for write
* access by any other process.
*
* @flag OF_DENYREAD | Opens the file and denies other
* processes read access to the file. <f AVIFileOpen> fails if the
* file has been opened in compatibility mode or for read access
* by any other process.
*
* @flag OF_DENYNONE | Opens the file without denying other
* processes read or write access to the file. <f AVIFileOpen>
* fails if the file has been opened in compatibility mode
* by any other process.
*
* @flag OF_EXCLUSIVE | Opens the file and denies other processes
* any access to the file. <f AVIFileOpen> will fail if any
* other process has opened the file.
*
* See <f OpenFile> for more information about these flags.
*
* @parm CLSID FAR * | pclsidHandler | Specifies a pointer to a class ID
* identifying the handler you want to use. If NULL, the system
* chooses one from the registration database based on the file
* extension or the file's RIFF type.
*
* @comm In general, the mode specified is used to open
* the file.
*
* Be sure to call <f AVIFileInit> at least once in your
* application before calling this function, and to balance each
* call to <f AVIFileInit> with a call to <f AVIFileExit>.
*
* @rdesc Returns zero if successful; otherwise returns an error code.
* Possible error returns include:
*
* @flag AVIERR_BADFORMAT | The file was corrupted or not in the
* proper format, and could not be read.
*
* @flag AVIERR_MEMORY | The file could not be opened because
* there was not enough memory.
*
* @flag AVIERR_FILEREAD | A disk error occurred while reading the
* file.
*
* @flag AVIERR_FILEOPEN | A disk error occurred while opening the
* file.
*
* @flag REGDB_E_CLASSNOTREG | No handler could be found to open
* this type of file.
*
* @xref <f AVIFileRelease> <f AVIFileInit>
*
*************************************************************************/
STDAPI AVIFileOpen (PAVIFILE FAR *ppfile,
LPCSTR szFile,
UINT mode,
CLSID FAR *pclsidHandler)
{
CLSID clsid;
HRESULT hr;
// We used to just fail if AVIFileInit wasn't called
#if 0
if (!iInit) {
return ResultFromScode(E_UNEXPECTED);
}
#endif
// Now we do it for them
hr = CoInitialize(NULL);
// Let them know what they did wrong
if (GetScode(hr) == NOERROR) {
#ifdef DEBUG
MessageBox(NULL, "You didn't call AVIFileInit!", "Bad dog!",
MB_OK | MB_ICONHAND);
#endif
} else
CoUninitialize();
*ppfile = 0;
if (pclsidHandler)
clsid = *pclsidHandler;
else {
if (!GetHandlerFromFile(szFile, &clsid)) {
DPF("Couldn't find handler for %s\n", (LPSTR) szFile);
return ResultFromScode(REGDB_E_CLASSNOTREG);
}
}
if (FAILED(GetScode(hr = CoCreateInstance((RCLSID) clsid,
NULL, CLSCTX_INPROC,
(REFIID) IID_IAVIFile,
(void FAR* FAR*)ppfile)))) {
DPF("CoCreateInstance returns %08lx\n", (DWORD) hr);
return hr;
}
//
// Let's simplify things for the handlers. They will only see...
// OF_CREATE | OF_READWRITE or...
// OF_READWRITE or...
// OF_READ
//
if (mode & OF_READWRITE)
mode &= ~(OF_WRITE | OF_READ);
if (mode & OF_CREATE) {
mode &= ~(OF_WRITE | OF_READ);
mode |= OF_READWRITE;
}
if (mode & OF_WRITE) {
mode &= ~(OF_WRITE | OF_READ);
mode |= OF_READWRITE;
}
if (FAILED(GetScode(hr = (*ppfile)->Open(szFile, mode)))) {
DPF("Open method returns %08lx\n", (DWORD) hr);
(*ppfile)->Release();
*ppfile = NULL;
}
return hr;
}
/**************************************************************************
* @doc EXTERNAL AVIFileAddRef
*
* @api LONG | AVIFileAddRef | Increases the reference count of an AVI file.
*
* @parm PAVIFILE | pfile | Specifies the handle for an open AVI file.
*
* @rdesc Returns zero on success; otherwise returns an error code.
*
* @comm Balance each call to <f AVIFileAddRef> with a call to
* <f AVIFileRelease>.
*
* @xref <f AVIFileRelease>
*
*************************************************************************/
STDAPI_(ULONG) AVIFileAddRef(PAVIFILE pfile)
{
return pfile->AddRef();
}
/**************************************************************************
* @doc EXTERNAL AVIFileRelease
*
* @api LONG | AVIFileRelease | Reduces the reference count of an AVI file
* interface handle by one, and closes the file if the count reaches
* zero.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @comm Balance each call to <f AVIFileAddRef> or <f AVIFileOpen>
* a call to <f AVIFileRelease>.
*
* @devnote Currently, this saves all changes to the file. Should a separate
* Save command be needed to do this?
*
* @rdesc Returns the reference count of the file. This return value
* should be used only for debugging purposes.
*
* @xref AVIFileOpen AVIFileAddRef
*
*************************************************************************/
STDAPI_(ULONG) AVIFileRelease(PAVIFILE pfile)
{
return pfile->Release();
}
/**************************************************************************
* @doc EXTERNAL AVIFileInfo
*
* @api LONG | AVIFileInfo | Obtains information about an AVI file.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm AVIFILEINFO FAR * | pfi | Pointer to the structure used to
* return file information.
*
* @parm LONG | lSize | Specifies the size of the structure. This value
* should be at least sizeof(AVIFILEINFO), obviously.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
*************************************************************************/
STDAPI AVIFileInfo (PAVIFILE pfile, AVIFILEINFO FAR * pfi,
LONG lSize)
{
_fmemset(pfi, 0, (int)lSize);
return pfile->Info(pfi, lSize);
}
/**************************************************************************
* @doc EXTERNAL AVIFileGetStream
*
* @api LONG | AVIFileGetStream | Returns a pointer to a stream interface
* that is a component of a file.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm PAVISTREAM FAR * | ppavi | Pointer to the return location
* for the new stream interface pointer.
*
* @parm DWORD | fccType | Specifies a four-character code
* indicating the type of stream to be opened.
* Zero indicates that any stream can be opened. The following
* definitions apply to the data commonly
* found in AVI streams:
*
* @flag streamtypeAUDIO | Indicates an audio stream.
* @flag streamtypeMIDI | Indicates a MIDI stream.
* @flag streamtypeTEXT | Indicates a text stream.
* @flag streamtypeVIDEO | Indicates a video stream.
*
* @parm LONG | lParam | Specifies an integer indicating which stream
* of the type defined by <p fccType> should actually be accessed.
*
* @comm Balance each call to <f AVIFileGetStream> with a call to
* <f AVIStreamRelease> using the stream handle returned.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
* Possible error codes include:
*
* @flag AVIERR_NODATA | There is no stream in the file corresponding
* to the values passed in for <p fccType> and <p lParam>.
* @flag AVIERR_MEMORY | Not enough memory.
*
* @xref <f AVIStreamRelease>
*
*************************************************************************/
STDAPI AVIFileGetStream (PAVIFILE pfile, PAVISTREAM FAR * ppavi, DWORD fccType, LONG lParam)
{
return pfile->GetStream(ppavi, fccType, lParam);
}
#if 0
// !!! This would be used to save changes, if AVIFileRelease didn't do that.
STDAPI AVIFileSave (PAVIFILE pfile,
LPCSTR szFile,
AVISAVEOPTIONS FAR *lpOptions,
AVISAVECALLBACK lpfnCallback,
PAVIFILEHANDLER pfh)
{
if (pfile->FileSave == NULL)
return -1;
return pfile->FileSave(pfile, szFile, lpOptions, lpfnCallback);
}
#endif
/**************************************************************************
* @doc EXTERNAL AVIFileCreateStream
*
* @api LONG | AVIFileCreateStream | Creates a new stream in an existing file,
* and returns a stream interface pointer for it.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm PAVISTREAM FAR * | ppavi | Specifies a pointer used to return the new
* stream interface pointer.
*
* @parm AVISTREAMINFO FAR * | psi | Specifies a pointer to a structure
* containing information about the new stream. This structure
* contains the type of the new stream and its sample rate.
*
* @comm Balance each call to <f AVIFileCreateStream> with a call to
* <f AVIStreamRelease> using the returned stream handle.
*
* This function fails with a return value of AVIERR_READONLY unless
* the file was opened with write permission.
*
* After creating the stream, call <f AVIStreamSetFormat>
* before using <f AVIStreamWrite> to write to the stream.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIStreamRelease> <f AVIFileGetStream> <f AVIStreamSetFormat>
*
*************************************************************************/
STDAPI AVIFileCreateStream (PAVIFILE pfile,
PAVISTREAM FAR *ppavi,
AVISTREAMINFO FAR *psi)
{
*ppavi = NULL;
return pfile->CreateStream(ppavi, psi);
}
/**************************************************************************
* @doc INTERNAL AVIFileAddStream
*
* @api LONG | AVIFileAddStream | Adds an existing stream into
* an existing file, and returns a stream interface pointer for it.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm PAVISTREAM | pavi | Specifies a stream interface pointer
* for the stream being added.
*
* @parm PAVISTREAM FAR * | ppaviNew | Pointer to a buffer used
* to return the new stream interface pointer.
*
* @comm Balance each call to <f AVIFileAddStream> with a call to
* <f AVIStreamRelease> using the returned stream handle.
*
* This call fails with a return value of AVIERR_READONLY unless
* the file was opened with write permission.
*
* @devnote This function still doesn't really work. Perhaps it should just
* be a helper function that gets data from the stream and calls
* AVIFileCreateStream, then copies the data from one stream to another.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref AVIStreamRelease AVIFileGetStream AVIFileCreateStream
*
*************************************************************************/
#if 0
STDAPI AVIFileAddStream (PAVIFILE pfile,
PAVISTREAM pavi,
PAVISTREAM FAR * ppaviNew)
{
// if (pfile->FileAddStream == NULL)
// return -1;
return pfile->AddStream(pavi, ppaviNew);
}
#endif
/**************************************************************************
* @doc EXTERNAL AVIFileWriteData
*
* @api LONG | AVIFileWriteData | Writes some additional data to the file.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm DWORD | ckid | Specifies a four-character code identifying the data.
*
* @parm LPVOID | lpData | Specifies a pointer to the data to write.
*
* @parm LONG | cbData | Specifies the size of the memory block
* referenced by <p lpData>.
*
* @comm This function fails with a return value of AVIERR_READONLY unless
* the file was opened with write permission.
*
* Use <f AVIStreamWriteData> instead of this function to write
* data that applies to an individual stream.
*
* @devnote !!! Somewhere, we should specify some types.
* !!! Should the data block contain the ckid and cksize?
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIStreamWriteData> <f AVIFileReadData>
*
*************************************************************************/
STDAPI AVIFileWriteData (PAVIFILE pfile,
DWORD ckid,
LPVOID lpData,
LONG cbData)
{
// if (pfile->FileWriteData == NULL)
// return -1;
return pfile->WriteData(ckid, lpData, cbData);
}
/**************************************************************************
* @doc EXTERNAL AVIFileReadData
*
* @api LONG | AVIFileReadData | Reads optional header data from the file.
*
* @parm PAVIFILE | pfile | Specifies a handle to an open AVI file.
*
* @parm DWORD | ckid | Specifies a four-character code identifying the data.
*
* @parm LPVOID | lpData | Specifies a pointer to a buffer used to return
* the data read.
*
* @parm LONG FAR * | lpcbData | Specifies a pointer to a location indicating
* the size of the memory block referred to by <p lpData>. If
* the read is successful, the value is changed to indicate the
* amount of data read.
*
* @devnote !!! Somewhere, we should specify some types.
* !!! Should the data block contain the ckid and cksize?
*
* @comm Do not use this function to read video and audio data. Use it
* only to read additional information such as author
* information or copyright information that applies to the file
* as a whole. Information that applies to a single stream should
* be read using <f AVIStreamReadData>.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
* The return value AVIERR_NODATA indicates that data with the
* requested chunk ID does not exist.
*
* @xref <f AVIStreamReadData> <f AVIFileWriteData>
*
*************************************************************************/
STDAPI AVIFileReadData (PAVIFILE pfile,
DWORD ckid,
LPVOID lpData,
LONG FAR * lpcbData)
{
return pfile->ReadData(ckid, lpData, lpcbData);
}
/**************************************************************************
* @doc EXTERNAL AVIFileEndRecord
*
* @api LONG | AVIFileEndRecord | Marks the end of a record, if writing out
* a strictly interleaved file.
*
* @parm PAVIFILE | pfile | Specifies a handle to a currently open AVI file.
*
* @comm <f AVIFileSave> uses this function when writing files that are
* have audio interleaved every frame. In general, applications
* should not need to use this function.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIFileSave> <f AVIStreamWrite>
*
*************************************************************************/
STDAPI AVIFileEndRecord (PAVIFILE pfile)
{
// if (pfile->FileEndRecord == NULL)
// return -1;
return pfile->EndRecord();
}
/**************************************************************************
* @doc EXTERNAL AVIStreamAddRef
*
* @api LONG | AVIStreamAddRef | Increases the reference count of an AVI stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open AVI stream.
*
* @comm Balance each call to <f AVIStreamAddRef> with a call to
* <f AVIStreamRelease>.
*
* @rdesc Returns the current reference count of the stream. This value
* should only be used for debugging purposes.
*
* @xref <f AVIStreamRelease>
*
*************************************************************************/
STDAPI_(ULONG) AVIStreamAddRef (PAVISTREAM pavi)
{
return pavi->AddRef();
}
/**************************************************************************
* @doc EXTERNAL AVIStreamRelease
*
* @api LONG | AVIStreamRelease | Reduces the reference count of an AVI stream
* interface handle by one, and closes the stream if the count reaches
* zero.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @comm Balance each call to <f AVIStreamAddRef> or <f AVIFileGetStream>
* with a call to <f AVIStreamRelease>.
*
* @rdesc Returns the current reference count of the stream. This value
* should only be used for debugging purposes.
*
* @xref <f AVIFileGetStream> <f AVIStreamAddRef>
*
*************************************************************************/
STDAPI_(ULONG) AVIStreamRelease (PAVISTREAM pavi)
{
return pavi->Release();
}
/**************************************************************************
* @doc EXTERNAL AVIStreamInfo
*
* @api LONG | AVIStreamInfo | Obtains stream header information.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm AVISTREAMINFO FAR * | psi | Specifies a pointer to a structure
* used to return stream information.
*
* @parm LONG | lSize | Specifies the size of the structure used for
* <p psi>.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
*************************************************************************/
STDAPI AVIStreamInfo (PAVISTREAM pavi, AVISTREAMINFO FAR * psi, LONG lSize)
{
_fmemset(psi, 0, (int)lSize);
return pavi->Info(psi, lSize);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamFindSample
*
* @api LONG | AVIStreamFindSample | Returns the position of
* a key frames or non-empty frame relative to the specified position.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lPos | Specifies the starting position
* for the search.
*
* @parm LONG | lFlags | The following flags are defined:
*
* @flag FIND_KEY | Finds a key frame.
* @flag FIND_ANY | Finds a non-empty sample.
* @flag FIND_FORMAT | Finds a format change.
*
* @flag FIND_NEXT | Finds nearest sample, frame, or format change
* searching forward. The current sample is
* included in the search. Use this flag with the
* FIND_ANY, FIND_KEY, or FIND_FORMAT flag.
*
* @flag FIND_PREV | Finds nearest sample, frame, or format change
* searching backwards. The current sample is
* included in the search. Use this flag with the
* FIND_ANY, FIND_KEY, or FIND_FORMAT flag.
*
*
* @comm The FIND_KEY, FIND_ANY, and FIND_FORMAT flags are mutually exclusive.
* The FIND_NEXT and FIND_PREV flags are also mutually exclusive.
* For example:
*
* @ex FIND_PREV|FIND_KEY Returns the first key sample prior to or at
* <p lPos>.
*
* FIND_PREV|FIND_ANY Returns the first non-empty sample prior to
* or at <p lPos>.
*
* FIND_NEXT|FIND_KEY Returns the first key sample after <p lPos>,
* or -1 if a key sample does not follow <p lPos>.
*
* FIND_NEXT|FIND_ANY Returns the first non-empty sample after <p lPos>,
* or -1 if a sample does not exist after <p lPos>.
*
* FIND_NEXT|FIND_FORMAT Returns the first format change after or
* at <p lPos>, or -1 if the stream does not
* have format changes.
*
* FIND_PREV|FIND_FORMAT Returns the first format change prior to
* or at <p lPos>. If the stream does not
* have format changes, it returns the first sample
*
* @rdesc Returns the position found. In many boundary cases, this
* function will return -1; see the example above for details.
*
*************************************************************************/
STDAPI_(LONG) AVIStreamFindSample(PAVISTREAM pavi, LONG lPos, LONG lFlags)
{
// Default to Find Previous Key Frame
if ((lFlags & FIND_TYPE) == 0)
lFlags |= FIND_KEY;
if ((lFlags & FIND_DIR) == 0)
lFlags |= FIND_PREV;
return pavi->FindSample(lPos, lFlags);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamReadFormat
*
* @api LONG | AVIStreamReadFormat | Reads the stream format data.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lPos | Specifies the position in the stream
* used to obtain the format data.
*
* @parm LPVOID | lpFormat | Specifies a pointer to a buffer
* used to return the format data.
*
* @parm LONG FAR * | lpcbFormat | Specifies a pointer to a
* location indicating the size of the memory block
* referred to by <p lpFormat>. On return, the value is
* changed to indicate the amount of data read. If
* <p lpFormat> is NULL, this parameter can be used
* to obtain the amount of memory needed to return the format.
*
* @comm This function will return part of the format even if the buffer
* provided is not large enough to hold the entire format. In this case
* the return value will be AVIERR_BUFFERTOOSMALL, and the location
* referenced by <p lpcbFormat> will be filled in with the size
* of the entire format.
*
* This is useful because it allows you to use a buffer the
* size of a <t BITMAPINFOHEADER> structure and
* retrieve just the common part of the video format if you are not
* interested in extended format information or palette information.
*
* @rdesc Returns zero if successful, otherwise it returns an error code.
*
*************************************************************************/
STDAPI AVIStreamReadFormat (PAVISTREAM pavi, LONG lPos,
LPVOID lpFormat, LONG FAR *lpcbFormat)
{
// if (pavi->StreamReadFormat == NULL)
// return -1;
return pavi->ReadFormat(lPos, lpFormat, lpcbFormat);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamSetFormat
*
* @api LONG | AVIStreamSetFormat | Sets the format of a stream at the
* specified position.
*
* @parm PAVISTREAM | pavi | Specifies a handle to open stream.
*
* @parm LONG | lPos | Specifies the position in the stream to
* receive the format.
*
* @parm LPVOID | lpFormat | Specifies a pointer to a structure
* containing the new format.
*
* @parm LONG | cbFormat | Specifies the size of the block of memory
* referred to by <p lpFormat> in bytes.
*
* @comm After creating a new stream with <f AVIFileCreateStream>,
* call this function to set the stream's format.
*
* The handler for writing AVI files does not, in general, accept
* format changes. Aside from setting the initial format for a
* stream, only changes in the palette of a video stream are allowed
* in an AVI file. The palette change must be after
* any frames already written to the AVI file. Other handlers may
* impose different restrictions.
*
* @rdesc Returns zero if successful, otherwise it returns an error code.
*
* @xref <f AVIFileCreateStream> <f AVIStreamReadFormat>
*
*************************************************************************/
STDAPI AVIStreamSetFormat (PAVISTREAM pavi, LONG lPos,
LPVOID lpFormat, LONG cbFormat)
{
// if (pavi->StreamSetFormat == NULL)
// return -1;
return pavi->SetFormat(lPos, lpFormat, cbFormat);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamReadData
*
* @api LONG | AVIStreamReadData | Reads optional header data from a stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm DWORD | ckid | Specifies a four-character code identifying the data.
*
* @parm LPVOID | lpData | Specifies a pointer to used to return
* the data read.
*
* @parm LONG FAR * | lpcbData | Points to a location which
* specifies the buffer size used for <p lpData>.
* If the read is successful, AVIFile changes this value
* to indicate the amount of data written into the buffer for
* <p lpData>.
*
* @comm This function only retrieves header information
* from the stream. To read the actual multimedia content of the
* stream, use <f AVIStreamRead>.
*
* @devnote !!! Somewhere, we should specify some types.
* !!! Should the data block contain the ckid and cksize?
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
* The return value AVIERR_NODATA indicates the system could not
* find any data with the specified chunk ID.
*
* @xref <f AVIFileReadData> <f AVIStreamWriteData> <f AVIStreamWrite>
*
*************************************************************************/
STDAPI AVIStreamReadData (PAVISTREAM pavi, DWORD ckid, LPVOID lpData, LONG FAR *lpcbData)
{
// if (pavi->StreamReadData == NULL)
// return -1;
return pavi->ReadData(ckid, lpData, lpcbData);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamWriteData
*
* @api LONG | AVIStreamWriteData | Writes optional data to the stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm DWORD | ckid | Specifies a four-character code identifying the data.
*
* @parm LPVOID | lpData | Specifies a pointer to a buffer containing
* the data to write.
*
* @parm LONG | cbData | Indicates the number of bytes of data to be copied
* from <p lpData> into the stream.
*
* @comm This function only writes header information to the stream.
* To write the actual multimedia content of the stream, use
* <f AVIStreamWrite>. Use <f AVIFileWriteData> to write
* data that applies to an entire file.
*
* This call fails with a return value of AVIERR_READONLY unless
* the file was opened with write permission.
*
* @devnote !!! Somewhere, we should specify some types.
* !!! Should the data block contain the ckid and cksize?
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIFileWriteData> <f AVIStreamReadData> <f AVIStreamWrite>
*
*************************************************************************/
STDAPI AVIStreamWriteData (PAVISTREAM pavi, DWORD ckid, LPVOID lpData, LONG cbData)
{
return pavi->WriteData(ckid, lpData, cbData);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamRead
*
* @api LONG | AVIStreamRead | Reads audio or video data from a stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lStart | Specifies the starting sample to read.
*
* @parm LONG | lSamples | Specifies the number of samples to read.
*
* @parm LPVOID | lpBuffer | Specifies a pointer to a buffer used to
* return the data.
*
* @parm LONG | cbBuffer | Specifies the size of buffer pointed to by <p lpBuffer>.
*
* @parm LONG FAR * | plBytes | Specifies a pointer to the location
* used to return number of bytes of data written into the
* buffer for <p lpBuffer>. <p plBytes> can be NULL.
*
* @parm LONG FAR * | plSamples | Specifies a pointer to the location
* used to return the number of samples written into the buffer for
* for <p lpBuffer>. <p plSamples> can be NULL.
*
* @comm If <p lpBuffer> is NULL, this function does not read
* any data; it returns information about the size of data
* that would be read.
*
* See <f AVIStreamLength> for a discussion of how sample numbers
* correspond to the data you want to read.
*
* @rdesc Returns zero if successful, or an error code. Use <p plBytes>
* and <p plSamples> to find out how much was actually read.
*
* Possible errors include:
*
* @flag AVIERR_BUFFERTOOSMALL | The buffer size <p cbBuffer> was
* too small to read in even a single sample of data.
*
* @flag AVIERR_MEMORY | There was not enough memory for some
* reason to complete the read operation.
*
* @flag AVIERR_FILEREAD | A disk error occurred while reading the
* file.
*
* @xref <f AVIFileGetStream> <f AVIStreamFindSample> <f AVIStreamWrite>
*
*************************************************************************/
STDAPI AVIStreamRead (PAVISTREAM pavi,
LONG lStart, LONG lSamples,
LPVOID lpBuffer, LONG cbBuffer,
LONG FAR * plBytes, LONG FAR * plSamples)
{
// if (pavi->StreamRead == NULL)
// return -1;
return pavi->Read(lStart, lSamples, lpBuffer, cbBuffer, plBytes, plSamples);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamWrite
*
* @api LONG | AVIStreamWrite | Writes data to a stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lStart | Specifies the starting sample to write.
*
* @parm LONG | lSamples | Specifies the number of samples to write.
*
* @parm LPVOID | lpBuffer | Specifies a pointer to buffer
* containing the data to write.
*
* @parm LONG | cbBuffer | Specifies the size of buffer used by <p lpBuffer>.
*
* @parm DWORD | dwFlags | Specifies any flags associated with this data.
* The following flags are defined:
*
* @flag AVIIF_KEYFRAME | Indicates this data does not rely on preceding
* data in the file.
*
* @parm LONG FAR * | plSampWritten | Specifies a pointer to a location
* used to return the number of samples written. This can be set
* to NULL.
*
* @parm LONG FAR * | plBytesWritten | Specifies a pointer to a location
* used to return the number of bytes written. This can be set
* to NULL.
*
* @comm The default AVI file handler only supports writing to the end
* of a stream. The WAVE file handler supports writing anywhere.
*
* This function overwrites existing data, rather than inserting
* new data.
*
* See <f AVIStreamLength> for a discussion of how sample numbers
* correspond to the data you want to read.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIFileGetStream> <f AVIFileCreateStream> <f AVIStreamRead>
*
*************************************************************************/
STDAPI AVIStreamWrite (PAVISTREAM pavi,
LONG lStart, LONG lSamples,
LPVOID lpBuffer, LONG cbBuffer,
DWORD dwFlags,
LONG FAR *plSampWritten,
LONG FAR *plBytesWritten)
{
// if (pavi->StreamWrite == NULL)
// return -1;
return pavi->Write(lStart, lSamples, lpBuffer, cbBuffer,
dwFlags, plSampWritten, plBytesWritten);
}
/**************************************************************************
* @doc INTERNAL AVIStreamDelete
*
* @api LONG | AVIStreamDelete | Deletes data from a stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lStart | Specifies the starting sample to delete.
*
* @parm LONG | lSamples | Specifies the number of samples to delete.
*
* @devnote This isn't implemented by anybody yet. Should it be? Wave files,
* for instance, would have to copy lots of data around....
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref
*
*************************************************************************/
STDAPI AVIStreamDelete (PAVISTREAM pavi, LONG lStart, LONG lSamples)
{
// if (pavi->StreamDelete == NULL)
// return -1;
return pavi->Delete(lStart, lSamples);
}
#if 0
// !!! should this exist?
STDAPI AVIStreamClone (PAVISTREAM pavi, PAVISTREAM FAR *ppaviNew)
{
// if (pavi->StreamClone == NULL)
// return -1;
return pavi->Clone(ppaviNew);
}
#endif
/**************************************************************************
* @doc EXTERNAL AVIStreamStart
*
* @api LONG | AVIStreamStart | Returns the starting sample of the stream.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @rdesc Returns the starting sample number for the stream, or -1 on error.
*
* @comm See <f AVIStreamLength> for a discussion of how sample numbers
* correspond to the data you want to read.
*
* @xref <f AVIStreamSampleToTime> <f AVIStreamLength>
*
*************************************************************************/
STDAPI_(LONG) AVIStreamStart (PAVISTREAM pavi)
{
AVISTREAMINFO avistream;
pavi->Info(&avistream, sizeof(avistream));
return (LONG) avistream.dwStart;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamLength
*
* @api LONG | AVIStreamLength | Returns the length of the stream in samples.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @devnote Currently, this doesn't call a handler function at all.
*
* @rdesc Returns the stream's length in samples, or -1 on error.
*
* @comm Values in samples can be converted to milliseconds using
* the <f AVIStreamSampleToTime> function.
*
* For video streams, each sample generally corresponds to a
* frame of video. There may, however, be sample numbers for
* which no video data is actually present: If <f AVIStreamRead>
* is called at those positions, it will return a data length
* of zero bytes. You can use <f AVIStreamFindSample> with the
* FIND_ANY flag to find sample numbers which actually have data.
*
* For audio streams, each sample corresponds to one "block"
* of data. Note the conflicting terminology here: if you're
* working with 22KHz ADPCM data, each block of audio data is
* 256 bytes, corresponding to about 500 "audio samples" which
* will be presented to the speaker each 22000th of a second.
* From the point of view of the AVIFile APIs, however, each 256-byte
* block is a single sample, because they cannot be subdivided.
*
* Note that the stream's starting position may not be zero; see
* <f AVIStreamStart>. Valid positions within a stream range from
* start to start+length; there is no actual data present at position
* start+length, but that corresponds to a time after the last data
* has been rendered.
*
* @xref <f AVIStreamInfo>
*
*************************************************************************/
STDAPI_(LONG) AVIStreamLength (PAVISTREAM pavi)
{
AVISTREAMINFO avistream;
HRESULT hr;
hr = pavi->Info(&avistream, sizeof(avistream));
if (hr != NOERROR) {
DPF("Error in AVIStreamLength!\n");
return 1;
}
return (LONG) avistream.dwLength;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamTimeToSample
*
* @api LONG | AVIStreamTimeToSample | Converts from milliseconds to samples.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lTime | Specifies the time in milliseconds.
*
* @devnote Currently, this doesn't call a handler function at all.
*
* @comm Samples typically correspond to audio samples or video frames.
* Other stream types might support different formats than these.
* @rdesc Returns the converted time, or -1 on error.
*
* @xref AVIStreamSampleToTime
*
*************************************************************************/
STDAPI_(LONG) AVIStreamTimeToSample (PAVISTREAM pavi, LONG lTime)
{
AVISTREAMINFO avistream;
HRESULT hr;
LONG lSample;
// Invalid time
if (lTime < 0)
return -1;
hr = pavi->Info(&avistream, sizeof(avistream));
if (hr != NOERROR || avistream.dwScale == 0) {
DPF("Error in AVIStreamTimeToSample!\n");
return lTime;
}
// This is likely to overflow if we're not careful for long AVIs
// so keep the 1000 inside the brackets.
if (avistream.dwRate / avistream.dwScale < 1000)
lSample = muldivrd32(lTime, avistream.dwRate, avistream.dwScale * 1000);
else
lSample = muldivru32(lTime, avistream.dwRate, avistream.dwScale * 1000);
lSample = min(max(lSample, (LONG) avistream.dwStart),
(LONG) (avistream.dwStart + avistream.dwLength));
return lSample;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamSampleToTime
*
* @api LONG | AVIStreamSampleToTime | Converts from samples to milliseconds.
* Samples can correspond to blocks of audio samples, video frames, or other format
* depending on the stream type.
*
* @parm PAVISTREAM | pavi | Specifies a handle to an open stream.
*
* @parm LONG | lSample | Specifies the position information.
*
* @rdesc Returns the converted time, or -1 on error.
*
* @xref <f AVIStreamTimeToSample>
*
*************************************************************************/
STDAPI_(LONG) AVIStreamSampleToTime (PAVISTREAM pavi, LONG lSample)
{
AVISTREAMINFO avistream;
HRESULT hr;
hr = pavi->Info(&avistream, sizeof(avistream));
if (hr != NOERROR || avistream.dwRate == 0) {
DPF("Error in AVIStreamSampleToTime!\n");
return lSample;
}
lSample = min(max(lSample, (LONG) avistream.dwStart),
(LONG) (avistream.dwStart + avistream.dwLength));
// lSample * 1000 would overflow too easily
if (avistream.dwRate / avistream.dwScale < 1000)
return muldivrd32(lSample, avistream.dwScale * 1000, avistream.dwRate);
else
return muldivru32(lSample, avistream.dwScale * 1000, avistream.dwRate);
}
/**************************************************************************
* @doc EXTERNAL AVIStreamOpenFromFile
*
* @api LONG | AVIStreamOpenFromFile | This function provides a convenient
* way to open a single stream from a file.
*
* @parm PAVISTREAM FAR * | ppavi | Specifies a pointer to the location
* used to return the new stream handle.
*
* @parm LPCSTR | szFile | Specifies a zero-terminated string containing
* the name of the file to open.
*
* @parm DWORD | fccType | Specifies a four-character code
* indicating the type of stream to be opened.
* Zero indicates that any stream can be opened. The following
* definitions apply to the data commonly
* found in AVI streams:
*
* @flag streamtypeAUDIO | Indicates an audio stream.
* @flag streamtypeMIDI | Indicates a MIDI stream.
* @flag streamtypeTEXT | Indicates a text stream.
* @flag streamtypeVIDEO | Indicates a video stream.
*
* @parm LONG | lParam | Indicates which stream of the type specified in
* <p fccType> should actually be accessed.
*
* @parm UINT | mode | Specifies the mode to use when opening the file.
* This function can only open existing streams so the OF_CREATE
* mode flag cannot be used. See
* <f OpenFile> for more information about the available flags.
*
* @parm CLSID FAR * | pclsidHandler | Specifies a pointer to a class ID
* identifying the handler you want to use. If NULL, the system
* chooses one from the registration database based on the file
* extension or the file's RIFF type.
*
* @comm Balance each call to <f AVIStreamOpenFromFile> with a
* call to <f AVIStreamRelease> using the stream handle returned.
*
* This function calls <f AVIFileOpen>, <f AVIFileGetStream>, and
* <f AVIFileRelease>.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref <f AVIFileOpen> <f AVIFileGetStream>
*
*************************************************************************/
STDAPI AVIStreamOpenFromFile(PAVISTREAM FAR *ppavi,
LPCSTR szFile,
DWORD fccType, LONG lParam,
UINT mode, CLSID FAR *pclsidHandler)
{
PAVIFILE pfile;
HRESULT hr;
hr = AVIFileOpen(&pfile, szFile, mode, pclsidHandler);
if (!FAILED(GetScode(hr))) {
hr = AVIFileGetStream(pfile, ppavi, fccType, lParam);
AVIFileRelease(pfile); // the stream still has a reference to the file
}
return hr;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamCreate
*
* @api LONG | AVIStreamCreate | Creates a stream not associated with any
* file.
*
* @parm PAVISTREAM FAR * | ppavi | Pointer to a location to return the
* new stream handle.
*
* @parm LONG | lParam1 | Specifies stream-handler specific information.
*
* @parm LONG | lParam2 | Specifies stream-handler specific information.
*
* @parm CLSID FAR * | pclsidHandler | Pointer to the class ID used
* for the stream.
*
* @comm Balance each call to <f AVIStreamCreate> with a
* call to <f AVIStreamRelease>.
*
* You should not need to call this function; functions like
* <f CreateEditableStream> and <f AVIMakeCompressedStream>
* use it internally.
*
* @rdesc Returns zero if successful; otherwise returns an error code.
*
* @xref <f AVIFileOpen> <f AVIFileGetStream>
*
*************************************************************************/
STDAPI AVIStreamCreate (PAVISTREAM FAR *ppavi, LONG lParam1, LONG lParam2,
CLSID FAR *pclsidHandler)
{
CLSID clsid;
HRESULT hr;
if (!iInit) {
return ResultFromScode(E_UNEXPECTED);
}
if (pclsidHandler)
clsid = *pclsidHandler;
else {
return ResultFromScode(REGDB_E_CLASSNOTREG);
}
if (FAILED(GetScode(hr = CoCreateInstance((REFCLSID) clsid,
NULL, CLSCTX_INPROC,
(REFIID) IID_IAVIStream,
(void FAR* FAR*)ppavi))))
return hr;
if (FAILED(GetScode(hr = (*ppavi)->Create(lParam1, lParam2)))) {
(*ppavi)->Release();
// AVIStreamExit();
}
return AVIERR_OK;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamBeginStreaming
*
* @api LONG | AVIStreamBeginStreaming | Specifies the parameters for
* streaming and lets a stream handler prepare for streaming.
*
* @parm PAVISTREAM | pavi | Specifies a pointer to a stream.
*
* @parm LONG | lStart | Specifies the starting point for streaming.
*
* @parm LONG | lEnd | Specifies the ending point for streaming.
*
* @parm LONG | lRate | Specifies the speed at which the file will be
* read relative to its natural speed. Specify 1000 for the normal speed.
*
* @comm Many stream implementations ignore this function.
*
* @rdesc Returns zero if successful; otherwise returns an error code.
*
* @xref <f AVIStreamEndStreaming>
*
*************************************************************************/
STDAPI AVIStreamBeginStreaming(PAVISTREAM pavi,
LONG lStart,
LONG lEnd,
LONG lRate)
{
IAVIStreaming FAR * pi;
HRESULT hr;
if (FAILED(GetScode(pavi->QueryInterface(IID_IAVIStreaming,
(void FAR* FAR*) &pi))))
return AVIERR_OK;
hr = pi->Begin(lStart, lEnd, lRate);
pi->Release();
return hr;
}
/**************************************************************************
* @doc EXTERNAL AVIStreamEndStreaming
*
* @api LONG | AVIStreamEndStreaming | Ends streaming.
*
* @parm PAVISTREAM | pavi | Specifies a pointer to a stream.
*
* @comm Many stream implementations ignore this function.
*
* @rdesc Returns zero if successful; otherwise it returns an error code.
*
* @xref AVIStreamBeginStreaming
*
*************************************************************************/
STDAPI AVIStreamEndStreaming(PAVISTREAM pavi)
{
IAVIStreaming FAR * pi;
HRESULT hr;
if (FAILED(GetScode(pavi->QueryInterface(IID_IAVIStreaming, (LPVOID FAR *) &pi))))
return AVIERR_OK;
hr = pi->End();
pi->Release();
return hr;
}
#if 0
/*******************************************************************
* @doc INTERNAL AVIStreamHasChanged
*
* @api LONG | AVIStreamHasChanged | This function forces an update
* of the strem information for the specified stream.
*
* @parm PAVISTREAM | pavi | Interface pointer for an AVI stream instance.
*
* @rdesc Returns AVIERR_OK on success.
*
****************************************************************/
STDAPI AVIStreamHasChanged(PAVISTREAM pavi)
{
pavi->lFrame = -4224; // bogus value
AVIStreamInfo(pavi, &pavi->avistream, sizeof(pavi->avistream));
// !!! Only need to do this if format changes?
AVIReleaseCachedData(pavi);
return AVIERR_OK;
}
#endif
static SZCODE aszRegCompressors[] = "AVIFile\\Compressors\\%.4ls";
/*******************************************************************
* @doc EXTERNAL AVIMakeCompressedStream
*
* @api HRESULT | AVIMakeCompressedStream | Returns a pointer to a
* compressed stream created from an uncompressed stream.
* The uncompressed stream is compressed using
* the compression options specified.
*
* @parm PAVISTREAM FAR * | ppsCompressed | Specifies a pointer to
* the location used to return the compressed stream pointer.
*
* @parm PAVISTREAM | psSource | Specifies a pointer to the stream to be compressed.
*
* @parm AVICOMPRESSOPTIONS FAR * | lpOptions | Specifies a pointer to a
* structure indicating the type compression to use and the options
* to apply.
*
* @parm CLSID FAR * | pclsidHandler | Specifies a pointer to a
* class ID used to create the stream.
*
* @comm This supports both audio and video compression. Applications
* can use the created stream for reading or writing.
*
* For video compression, either specify a handler to use or specify
* the format for the compressed data.
*
* For audio compression, you can only specify a format for the compressed
* data.
*
* @rdesc Returns AVIERR_OK on success, or an error code.
* Possible errors include:
*
* @flag AVIERR_NOCOMPRESSOR | No suitable compressor can be found.
*
* @flag AVIERR_MEMORY | There was not enough memory to complete the operation.
*
* @flag AVIERR_UNSUPPORTED | Compression is not supported for this type
* of data. This error may be returned if you try to compress
* data that is not audio or video.
*
*
*
****************************************************************/
STDAPI AVIMakeCompressedStream(
PAVISTREAM FAR * ppsCompressed,
PAVISTREAM psSource,
AVICOMPRESSOPTIONS FAR * lpOptions,
CLSID FAR *pclsidHandler)
{
CLSID clsid;
char achKey[100];
char achClass[100];
LONG lcbClass;
AVISTREAMINFO strhdr;
HRESULT hr;
*ppsCompressed = NULL;
if (pclsidHandler) {
clsid = *pclsidHandler;
} else {
if (FAILED(GetScode(hr = AVIStreamInfo(psSource,
&strhdr,
sizeof(strhdr)))))
return hr;
// Look up the stream type in the registration database to find
// the appropriate compressor....
wsprintf(achKey, aszRegCompressors, (LPSTR) &strhdr.fccType);
lcbClass = sizeof(achClass);
RegQueryValue(HKEY_CLASSES_ROOT, achKey, achClass, &lcbClass);
if (FAILED(GetScode(CLSIDFromString(achClass, &clsid))))
return ResultFromScode(AVIERR_UNSUPPORTED);
}
if (FAILED(GetScode(hr = CoCreateInstance((REFCLSID) clsid,
NULL, CLSCTX_INPROC,
(REFIID) IID_IAVIStream,
(void FAR* FAR*)ppsCompressed))))
return hr; // !!! PropagateHResult?
if (FAILED(GetScode(hr = (*ppsCompressed)->Create((LONG) psSource,
(LONG) lpOptions)))) {
(*ppsCompressed)->Release();
*ppsCompressed = NULL;
return hr;
}
return AVIERR_OK;
}
typedef struct {
char achClsid[64];
char achExtString[128];
} TEMPFILTER, FAR * LPTEMPFILTER;
SZCODE aszAnotherExtension[] = ";*.%s";
/***************************************************************************
*
* @doc INTERNAL MCIAVI
*
* @api LONG | atol | local version of atol
*
***************************************************************************/
static LONG NEAR PASCAL atol(char FAR *sz)
{
LONG l = 0;
while (*sz)
l = l*10 + *sz++ - '0';
return l;
}
/*******************************************************************
* @doc EXTERNAL AVIBuildFilter
*
* @api HRESULT | AVIBuildFilter | Builds a filter specification for passing
* to <f GetOpenFileName> or <f GetSaveFileName>.
*
* @parm LPSTR | lpszFilter | Pointer to buffer where the filter string
* should be returned.
*
* @parm LONG | cbFilter | Size of buffer pointed to by <p lpszFilter>.
*
* @parm BOOL | fSaving | Indicates whether the filter should include only
* formats that can be written, or all formats that can be read.
*
* @rdesc Returns AVIERR_OK on success.
*
* @comm This function does not check if the DLLs referenced
* in the registration database actually exist.
*
****************************************************************/
STDAPI AVIBuildFilter(LPSTR lpszFilter, LONG cbFilter, BOOL fSaving)
{
#define MAXFILTERS 256
LPTEMPFILTER lpf;
int i;
int cf = 0;
HKEY hkey;
LONG lRet;
DWORD dwSubKey;
char ach[128];
char ach2[128];
char achExt[10];
LONG cb;
char achAllFiles[40];
int cbAllFiles;
// This string has a NULL in it, so remember its length for real....
cbAllFiles = LoadString(ghMod,
IDS_ALLFILES,
achAllFiles,
sizeof(achAllFiles));
for (i = 0; i < cbAllFiles; i++)
if (achAllFiles[i] == '@')
achAllFiles[i] = '\0';
lpf = (LPTEMPFILTER) GlobalAllocPtr(GHND, sizeof(TEMPFILTER) * MAXFILTERS);
if (!lpf) {
return ResultFromScode(AVIERR_MEMORY);
}
lRet = RegOpenKey(HKEY_CLASSES_ROOT, aszRegExt, &hkey);
if (lRet != ERROR_SUCCESS) {
}
// Make sure that AVI files come first in the list....
// !!! Should use StringFromClsid here!
_fstrcpy(lpf[1].achClsid, "{00020000-0000-0000-C000-000000000046}");
cf = 1;
//
// First, scan through the Extensions list looking for all of the
// handlers that are installed
//
for (dwSubKey = 0; ; dwSubKey++) {
lRet = RegEnumKey(hkey, dwSubKey, achExt, sizeof(achExt));
if (lRet != ERROR_SUCCESS) {
break;
}
cb = sizeof(ach);
lRet = RegQueryValue(hkey, achExt, ach, &cb);
if (lRet != ERROR_SUCCESS) {
break;
}
//
// See if we've seen this handler before
//
for (i = 1; i <= cf; i++) {
if (_fstrcmp(ach, lpf[i].achClsid) == 0) {
break;
}
}
//
// If not, add it to our list of handlers
//
if (i == cf + 1) {
if (cf == MAXFILTERS) {
DPF("Too many filters!\n");
continue;
}
_fstrcpy(lpf[i].achClsid, ach);
cb = sizeof(ach);
wsprintf(ach2, "%s\\AVIFile", (LPSTR) ach);
lRet = RegQueryValue(hkey, ach2, ach, &cb);
if (lRet == 0) {
lRet = atol(ach);
if (fSaving) {
if (!(lRet & AVIFILEHANDLER_CANWRITE))
continue;
} else {
if (!(lRet & AVIFILEHANDLER_CANREAD))
continue;
}
}
cf++;
}
wsprintf(ach, aszAnotherExtension, (LPSTR) achExt);
_fstrcat(lpf[i].achExtString, lpf[i].achExtString[0] ?
ach : ach + 1);
_fstrcat(lpf[0].achExtString, lpf[0].achExtString[0] ?
ach : ach + 1);
}
RegCloseKey(hkey);
lRet = RegOpenKey(HKEY_CLASSES_ROOT, aszRegClsid, &hkey);
if (lRet != ERROR_SUCCESS) {
}
//
// Now, scan through our list of handlers and build up the
// filter to use....
//
for (i = 0; i <= cf; i++) {
if (i == 0) {
cb = wsprintf(lpszFilter, "All multimedia files") + 1; // !!!
} else {
cb = sizeof(ach);
lRet = RegQueryValue(hkey, lpf[i].achClsid, ach, &cb);
if (cbFilter < (LONG)(_fstrlen(lpf[i].achExtString) +
(LONG)_fstrlen(ach) + 10)) {
break; // !!!
}
cb = wsprintf(lpszFilter, "%s", // "%s (%s)", Todd doesn't like this
(LPSTR) ach, (LPSTR) lpf[i].achExtString) + 1;
}
cbFilter -= cb;
lpszFilter += cb;
_fstrncpy(lpszFilter, lpf[i].achExtString, (int) cbFilter);
cbFilter -= _fstrlen(lpf[i].achExtString) + 1;
lpszFilter += _fstrlen(lpf[i].achExtString) + 1;
if (cbFilter <= 0) {
GlobalFreePtr(lpf);
return ResultFromScode(AVIERR_BUFFERTOOSMALL);
}
}
if (cbFilter > cbAllFiles) {
_fmemcpy(lpszFilter, achAllFiles, cbAllFiles);
cbFilter -= cbAllFiles;
lpszFilter += cbAllFiles;
}
RegCloseKey(hkey);
*lpszFilter++ = '\0';
--cbFilter;
GlobalFreePtr(lpf);
return AVIERR_OK;
}
/*****************************************************************************
*
* dprintf() is called by the DPF macro if DEBUG is defined at compile time.
*
* The messages will be send to COM1: like any debug message. To
* enable debug output, add the following to WIN.INI :
*
* [debug]
* ICSAMPLE=1
*
****************************************************************************/
#ifdef DEBUG
//
// I wish languages would make up their mind about defines!!!!!
//
#ifndef WINDLL
#define WINDLL
#endif
#ifndef _WINDLL
#define _WINDLL
#endif
#ifndef __WINDLL
#define __WINDLL
#endif
#include <stdarg.h>
#define MODNAME "AVIFILE"
static int iDebug = -1;
void cdecl dprintf(LPSTR szFormat, ...)
{
char ach[128];
if (iDebug == -1)
iDebug = GetProfileIntA("Debug", MODNAME, 0);
if (iDebug < 1)
return;
va_list va;
va_start(va, szFormat);
if (szFormat[0] == '!')
ach[0]=0, szFormat++;
else
lstrcpyA(ach, MODNAME ": ");
wvsprintfA(ach+lstrlenA(ach),szFormat,(LPSTR)va);
va_end(va);
// lstrcatA(ach, "\r\r\n");
OutputDebugStringA(ach);
}
void cdecl dprintf2(LPSTR szFormat, ...)
{
char ach[128];
if (iDebug == -1)
iDebug = GetProfileIntA("Debug", MODNAME, 0);
if (iDebug < 2)
return;
va_list va;
va_start(va, szFormat);
if (szFormat[0] == '!')
ach[0]=0, szFormat++;
else
lstrcpyA(ach, MODNAME ": ");
wvsprintfA(ach+lstrlenA(ach),szFormat,(LPSTR)va);
va_end(va);
// lstrcatA(ach, "\r\r\n");
OutputDebugStringA(ach);
}
void cdecl dprintf3(LPSTR szFormat, ...)
{
char ach[128];
if (iDebug == -1)
iDebug = GetProfileIntA("Debug", MODNAME, 0);
if (iDebug < 3)
return;
va_list va;
va_start(va, szFormat);
if (szFormat[0] == '!')
ach[0]=0, szFormat++;
else
lstrcpyA(ach, MODNAME ": ");
wvsprintfA(ach+lstrlenA(ach),szFormat,(LPSTR)va);
va_end(va);
// lstrcatA(ach, "\r\r\n");
OutputDebugStringA(ach);
}
#endif
#ifdef DEBUG
/* _Assert(szExpr, szFile, iLine)
*
* If <fExpr> is TRUE, then do nothing. If <fExpr> is FALSE, then display
* an "assertion failed" message box allowing the user to abort the program,
* enter the debugger (the "Retry" button), or igore the error.
*
* <szFile> is the name of the source file; <iLine> is the line number
* containing the _Assert() call.
*/
void FAR PASCAL
_Assert(char *szExp, char *szFile, int iLine)
{
static char ach[300]; // debug output (avoid stack overflow)
int id;
void FAR PASCAL DebugBreak(void);
/* display error message */
if (szExp)
wsprintfA(ach, "(%s)\nFile %s, line %d", (LPSTR)szExp, (LPSTR)szFile, iLine);
else
wsprintfA(ach, "File %s, line %d", (LPSTR)szFile, iLine);
MessageBeep(MB_ICONHAND);
id = MessageBoxA(NULL, ach, "Assertion Failed",
#ifdef BIDI
MB_RTL_READING |
#endif
MB_SYSTEMMODAL | MB_ICONHAND | MB_ABORTRETRYIGNORE);
/* abort, debug, or ignore */
switch (id)
{
case IDABORT:
FatalAppExit(0, "Good Bye");
break;
case IDRETRY:
/* break into the debugger */
DebugBreak();
break;
case IDIGNORE:
/* ignore the assertion failure */
break;
}
}
#endif
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