reactos/dll/win32/avifil32/acmstream.c

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/*
* Copyright 2002 Michael Günnewig
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winerror.h"
#include "mmsystem.h"
#include "vfw.h"
#include "msacm.h"
#include "avifile_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(avifile);
/***********************************************************************/
typedef struct _IAVIStreamImpl {
/* IUnknown stuff */
IAVIStream IAVIStream_iface;
LONG ref;
/* IAVIStream stuff */
PAVISTREAM pStream;
AVISTREAMINFOW sInfo;
HACMSTREAM has;
LPWAVEFORMATEX lpInFormat;
LONG cbInFormat;
LPWAVEFORMATEX lpOutFormat;
LONG cbOutFormat;
ACMSTREAMHEADER acmStreamHdr;
} IAVIStreamImpl;
/***********************************************************************/
#define CONVERT_STREAM_to_THIS(a) do { \
DWORD __bytes; \
acmStreamSize(This->has,*(a) * This->lpInFormat->nBlockAlign,\
&__bytes, ACM_STREAMSIZEF_SOURCE); \
*(a) = __bytes / This->lpOutFormat->nBlockAlign; } while(0)
#define CONVERT_THIS_to_STREAM(a) do { \
DWORD __bytes; \
acmStreamSize(This->has,*(a) * This->lpOutFormat->nBlockAlign,\
&__bytes, ACM_STREAMSIZEF_DESTINATION); \
*(a) = __bytes / This->lpInFormat->nBlockAlign; } while(0)
static HRESULT AVIFILE_OpenCompressor(IAVIStreamImpl *This)
{
HRESULT hr;
/* pre-conditions */
assert(This != NULL);
assert(This->pStream != NULL);
if (This->has != NULL)
return AVIERR_OK;
if (This->lpInFormat == NULL) {
/* decode or encode the data from pStream */
hr = AVIStreamFormatSize(This->pStream, This->sInfo.dwStart, &This->cbInFormat);
if (FAILED(hr))
return hr;
This->lpInFormat = HeapAlloc(GetProcessHeap(), 0, This->cbInFormat);
if (This->lpInFormat == NULL)
return AVIERR_MEMORY;
hr = IAVIStream_ReadFormat(This->pStream, This->sInfo.dwStart,
This->lpInFormat, &This->cbInFormat);
if (FAILED(hr))
return hr;
if (This->lpOutFormat == NULL) {
/* we must decode to default format */
This->cbOutFormat = sizeof(PCMWAVEFORMAT);
This->lpOutFormat = HeapAlloc(GetProcessHeap(), 0, This->cbOutFormat);
if (This->lpOutFormat == NULL)
return AVIERR_MEMORY;
This->lpOutFormat->wFormatTag = WAVE_FORMAT_PCM;
if (acmFormatSuggest(NULL, This->lpInFormat, This->lpOutFormat,
This->cbOutFormat, ACM_FORMATSUGGESTF_WFORMATTAG) != S_OK)
return AVIERR_NOCOMPRESSOR;
}
} else if (This->lpOutFormat == NULL)
return AVIERR_ERROR; /* To what should I encode? */
if (acmStreamOpen(&This->has, NULL, This->lpInFormat, This->lpOutFormat,
NULL, 0, 0, ACM_STREAMOPENF_NONREALTIME) != S_OK)
return AVIERR_NOCOMPRESSOR;
/* update AVISTREAMINFO structure */
This->sInfo.dwSampleSize = This->lpOutFormat->nBlockAlign;
This->sInfo.dwScale = This->lpOutFormat->nBlockAlign;
This->sInfo.dwRate = This->lpOutFormat->nAvgBytesPerSec;
This->sInfo.dwQuality = (DWORD)ICQUALITY_DEFAULT;
SetRectEmpty(&This->sInfo.rcFrame);
/* convert positions and sizes to output format */
CONVERT_STREAM_to_THIS(&This->sInfo.dwStart);
CONVERT_STREAM_to_THIS(&This->sInfo.dwLength);
CONVERT_STREAM_to_THIS(&This->sInfo.dwSuggestedBufferSize);
return AVIERR_OK;
}
static inline IAVIStreamImpl *impl_from_IAVIStream(IAVIStream *iface)
{
return CONTAINING_RECORD(iface, IAVIStreamImpl, IAVIStream_iface);
}
static HRESULT WINAPI ACMStream_fnQueryInterface(IAVIStream *iface,
REFIID refiid, LPVOID *obj)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,%s,%p)\n", iface, debugstr_guid(refiid), obj);
if (IsEqualGUID(&IID_IUnknown, refiid) ||
IsEqualGUID(&IID_IAVIStream, refiid)) {
*obj = &This->IAVIStream_iface;
IAVIStream_AddRef(iface);
return S_OK;
}
return OLE_E_ENUM_NOMORE;
}
static ULONG WINAPI ACMStream_fnAddRef(IAVIStream *iface)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
ULONG ref = InterlockedIncrement(&This->ref);
TRACE("(%p) -> %d\n", iface, ref);
/* also add reference to the nested stream */
if (This->pStream != NULL)
IAVIStream_AddRef(This->pStream);
return ref;
}
static ULONG WINAPI ACMStream_fnRelease(IAVIStream* iface)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
ULONG ref = InterlockedDecrement(&This->ref);
TRACE("(%p) -> %d\n", iface, ref);
if (ref == 0) {
/* destruct */
if (This->has != NULL) {
if (This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED)
acmStreamUnprepareHeader(This->has, &This->acmStreamHdr, 0);
acmStreamClose(This->has, 0);
This->has = NULL;
}
HeapFree(GetProcessHeap(), 0, This->acmStreamHdr.pbSrc);
This->acmStreamHdr.pbSrc = NULL;
HeapFree(GetProcessHeap(), 0, This->acmStreamHdr.pbDst);
This->acmStreamHdr.pbDst = NULL;
if (This->lpInFormat != NULL) {
HeapFree(GetProcessHeap(), 0, This->lpInFormat);
This->lpInFormat = NULL;
This->cbInFormat = 0;
}
if (This->lpOutFormat != NULL) {
HeapFree(GetProcessHeap(), 0, This->lpOutFormat);
This->lpOutFormat = NULL;
This->cbOutFormat = 0;
}
if (This->pStream != NULL) {
IAVIStream_Release(This->pStream);
This->pStream = NULL;
}
HeapFree(GetProcessHeap(), 0, This);
return 0;
}
/* also release reference to the nested stream */
if (This->pStream != NULL)
IAVIStream_Release(This->pStream);
return ref;
}
/* lParam1: PAVISTREAM
* lParam2: LPAVICOMPRESSOPTIONS -- even if doc's say LPWAVEFORMAT
*/
static HRESULT WINAPI ACMStream_fnCreate(IAVIStream *iface, LPARAM lParam1,
LPARAM lParam2)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,0x%08lX,0x%08lX)\n", iface, lParam1, lParam2);
/* check for swapped parameters */
if ((LPVOID)lParam1 != NULL &&
((LPAVICOMPRESSOPTIONS)lParam1)->fccType == streamtypeAUDIO) {
LPARAM tmp = lParam1;
lParam1 = lParam2;
lParam2 = tmp;
}
if ((LPVOID)lParam1 == NULL)
return AVIERR_BADPARAM;
IAVIStream_Info((PAVISTREAM)lParam1, &This->sInfo, sizeof(This->sInfo));
if (This->sInfo.fccType != streamtypeAUDIO)
return AVIERR_ERROR; /* error in registry or AVIMakeCompressedStream */
This->sInfo.fccHandler = 0; /* be paranoid */
/* FIXME: check ACM version? Which version does we need? */
if ((LPVOID)lParam2 != NULL) {
/* We only need the format from the compress-options */
if (((LPAVICOMPRESSOPTIONS)lParam2)->fccType == streamtypeAUDIO)
lParam2 = (LPARAM)((LPAVICOMPRESSOPTIONS)lParam2)->lpFormat;
if (((LPWAVEFORMATEX)lParam2)->wFormatTag != WAVE_FORMAT_PCM)
This->cbOutFormat = sizeof(WAVEFORMATEX) + ((LPWAVEFORMATEX)lParam2)->cbSize;
else
This->cbOutFormat = sizeof(PCMWAVEFORMAT);
This->lpOutFormat = HeapAlloc(GetProcessHeap(), 0, This->cbOutFormat);
if (This->lpOutFormat == NULL)
return AVIERR_MEMORY;
memcpy(This->lpOutFormat, (LPVOID)lParam2, This->cbOutFormat);
} else {
This->lpOutFormat = NULL;
This->cbOutFormat = 0;
}
This->pStream = (PAVISTREAM)lParam1;
IAVIStream_AddRef(This->pStream);
return AVIERR_OK;
}
static HRESULT WINAPI ACMStream_fnInfo(IAVIStream *iface,LPAVISTREAMINFOW psi,
LONG size)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,%p,%d)\n", iface, psi, size);
if (psi == NULL)
return AVIERR_BADPARAM;
if (size < 0)
return AVIERR_BADSIZE;
/* Need codec to correct some values in structure */
if (This->has == NULL) {
HRESULT hr = AVIFILE_OpenCompressor(This);
if (FAILED(hr))
return hr;
}
memcpy(psi, &This->sInfo, min(size, (LONG)sizeof(This->sInfo)));
if (size < (LONG)sizeof(This->sInfo))
return AVIERR_BUFFERTOOSMALL;
return AVIERR_OK;
}
static LONG WINAPI ACMStream_fnFindSample(IAVIStream *iface, LONG pos,
LONG flags)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,%d,0x%08X)\n",iface,pos,flags);
if (flags & FIND_FROM_START) {
pos = This->sInfo.dwStart;
flags &= ~(FIND_FROM_START|FIND_PREV);
flags |= FIND_NEXT;
}
/* convert pos from our 'space' to This->pStream's one */
CONVERT_THIS_to_STREAM(&pos);
/* ask stream */
pos = IAVIStream_FindSample(This->pStream, pos, flags);
if (pos != -1) {
/* convert pos back to our 'space' if it's no size or physical pos */
if ((flags & FIND_RET) == 0)
CONVERT_STREAM_to_THIS(&pos);
}
return pos;
}
static HRESULT WINAPI ACMStream_fnReadFormat(IAVIStream *iface, LONG pos,
LPVOID format, LONG *formatsize)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,%d,%p,%p)\n", iface, pos, format, formatsize);
if (formatsize == NULL)
return AVIERR_BADPARAM;
if (This->has == NULL) {
HRESULT hr = AVIFILE_OpenCompressor(This);
if (FAILED(hr))
return hr;
}
/* only interested in needed buffersize? */
if (format == NULL || *formatsize <= 0) {
*formatsize = This->cbOutFormat;
return AVIERR_OK;
}
/* copy initial format (only as much as will fit) */
memcpy(format, This->lpOutFormat, min(*formatsize, This->cbOutFormat));
if (*formatsize < This->cbOutFormat) {
*formatsize = This->cbOutFormat;
return AVIERR_BUFFERTOOSMALL;
}
*formatsize = This->cbOutFormat;
return AVIERR_OK;
}
static HRESULT WINAPI ACMStream_fnSetFormat(IAVIStream *iface, LONG pos,
LPVOID format, LONG formatsize)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
HRESULT hr;
TRACE("(%p,%d,%p,%d)\n", iface, pos, format, formatsize);
/* check parameters */
if (format == NULL || formatsize <= 0)
return AVIERR_BADPARAM;
/* Input format already known?
* Changing is unsupported, but be quiet if it's the same */
if (This->lpInFormat != NULL) {
if (This->cbInFormat != formatsize ||
memcmp(format, This->lpInFormat, formatsize) != 0)
return AVIERR_UNSUPPORTED;
return AVIERR_OK;
}
/* Does the nested stream support writing? */
if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
return AVIERR_READONLY;
This->lpInFormat = HeapAlloc(GetProcessHeap(), 0, formatsize);
if (This->lpInFormat == NULL)
return AVIERR_MEMORY;
This->cbInFormat = formatsize;
memcpy(This->lpInFormat, format, formatsize);
/* initialize formats and get compressor */
hr = AVIFILE_OpenCompressor(This);
if (FAILED(hr))
return hr;
CONVERT_THIS_to_STREAM(&pos);
/* tell the nested stream the new format */
return IAVIStream_SetFormat(This->pStream, pos, This->lpOutFormat,
This->cbOutFormat);
}
static HRESULT WINAPI ACMStream_fnRead(IAVIStream *iface, LONG start,
LONG samples, LPVOID buffer,
LONG buffersize, LPLONG bytesread,
LPLONG samplesread)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
HRESULT hr;
DWORD size;
TRACE("(%p,%d,%d,%p,%d,%p,%p)\n", iface, start, samples, buffer,
buffersize, bytesread, samplesread);
/* clear return parameters if given */
if (bytesread != NULL)
*bytesread = 0;
if (samplesread != NULL)
*samplesread = 0;
/* Do we have our compressor? */
if (This->has == NULL) {
hr = AVIFILE_OpenCompressor(This);
if (FAILED(hr))
return hr;
}
/* only need to pass through? */
if (This->cbInFormat == This->cbOutFormat &&
memcmp(This->lpInFormat, This->lpOutFormat, This->cbInFormat) == 0) {
return IAVIStream_Read(This->pStream, start, samples, buffer, buffersize,
bytesread, samplesread);
}
/* read as much as fit? */
if (samples == -1)
samples = buffersize / This->lpOutFormat->nBlockAlign;
/* limit to buffersize */
if (samples * This->lpOutFormat->nBlockAlign > buffersize)
samples = buffersize / This->lpOutFormat->nBlockAlign;
/* only return needed size? */
if (buffer == NULL || buffersize <= 0 || samples == 0) {
if (bytesread == NULL && samplesread == NULL)
return AVIERR_BADPARAM;
if (bytesread != NULL)
*bytesread = samples * This->lpOutFormat->nBlockAlign;
if (samplesread != NULL)
*samplesread = samples;
return AVIERR_OK;
}
/* map our positions to pStream positions */
CONVERT_THIS_to_STREAM(&start);
/* our needed internal buffersize */
size = samples * This->lpInFormat->nBlockAlign;
/* Need to free destination buffer used for writing? */
if (This->acmStreamHdr.pbDst != NULL) {
HeapFree(GetProcessHeap(), 0, This->acmStreamHdr.pbDst);
This->acmStreamHdr.pbDst = NULL;
This->acmStreamHdr.dwDstUser = 0;
}
/* need bigger source buffer? */
if (This->acmStreamHdr.pbSrc == NULL ||
This->acmStreamHdr.dwSrcUser < size) {
if (This->acmStreamHdr.pbSrc == NULL)
This->acmStreamHdr.pbSrc = HeapAlloc(GetProcessHeap(), 0, size);
else
This->acmStreamHdr.pbSrc = HeapReAlloc(GetProcessHeap(), 0, This->acmStreamHdr.pbSrc, size);
if (This->acmStreamHdr.pbSrc == NULL)
return AVIERR_MEMORY;
This->acmStreamHdr.dwSrcUser = size;
}
This->acmStreamHdr.cbStruct = sizeof(This->acmStreamHdr);
This->acmStreamHdr.cbSrcLengthUsed = 0;
This->acmStreamHdr.cbDstLengthUsed = 0;
This->acmStreamHdr.cbSrcLength = size;
/* read source data */
hr = IAVIStream_Read(This->pStream, start, -1, This->acmStreamHdr.pbSrc,
This->acmStreamHdr.cbSrcLength,
(LONG *)&This->acmStreamHdr.cbSrcLength, NULL);
if (FAILED(hr) || This->acmStreamHdr.cbSrcLength == 0)
return hr;
/* need to prepare stream? */
This->acmStreamHdr.pbDst = buffer;
This->acmStreamHdr.cbDstLength = buffersize;
if ((This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED) == 0) {
if (acmStreamPrepareHeader(This->has, &This->acmStreamHdr, 0) != S_OK) {
This->acmStreamHdr.pbDst = NULL;
This->acmStreamHdr.cbDstLength = 0;
return AVIERR_COMPRESSOR;
}
}
/* now do the conversion */
/* FIXME: use ACM_CONVERTF_* flags */
if (acmStreamConvert(This->has, &This->acmStreamHdr, 0) != S_OK)
hr = AVIERR_COMPRESSOR;
This->acmStreamHdr.pbDst = NULL;
This->acmStreamHdr.cbDstLength = 0;
/* fill out return parameters if given */
if (bytesread != NULL)
*bytesread = This->acmStreamHdr.cbDstLengthUsed;
if (samplesread != NULL)
*samplesread =
This->acmStreamHdr.cbDstLengthUsed / This->lpOutFormat->nBlockAlign;
return hr;
}
static HRESULT WINAPI ACMStream_fnWrite(IAVIStream *iface, LONG start,
LONG samples, LPVOID buffer,
LONG buffersize, DWORD flags,
LPLONG sampwritten,
LPLONG byteswritten)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
HRESULT hr;
ULONG size;
TRACE("(%p,%d,%d,%p,%d,0x%08X,%p,%p)\n", iface, start, samples,
buffer, buffersize, flags, sampwritten, byteswritten);
/* clear return parameters if given */
if (sampwritten != NULL)
*sampwritten = 0;
if (byteswritten != NULL)
*byteswritten = 0;
/* check parameters */
if (buffer == NULL && (buffersize > 0 || samples > 0))
return AVIERR_BADPARAM;
/* Have we write capability? */
if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
return AVIERR_READONLY;
/* also need a compressor */
if (This->has == NULL)
return AVIERR_NOCOMPRESSOR;
/* map our sizes to pStream sizes */
size = buffersize;
CONVERT_THIS_to_STREAM(&size);
CONVERT_THIS_to_STREAM(&start);
/* no bytes to write? -- short circuit */
if (size == 0) {
return IAVIStream_Write(This->pStream, -1, samples, buffer, size,
flags, sampwritten, byteswritten);
}
/* Need to free source buffer used for reading? */
if (This->acmStreamHdr.pbSrc != NULL) {
HeapFree(GetProcessHeap(), 0, This->acmStreamHdr.pbSrc);
This->acmStreamHdr.pbSrc = NULL;
This->acmStreamHdr.dwSrcUser = 0;
}
/* Need bigger destination buffer? */
if (This->acmStreamHdr.pbDst == NULL ||
This->acmStreamHdr.dwDstUser < size) {
if (This->acmStreamHdr.pbDst == NULL)
This->acmStreamHdr.pbDst = HeapAlloc(GetProcessHeap(), 0, size);
else
This->acmStreamHdr.pbDst = HeapReAlloc(GetProcessHeap(), 0, This->acmStreamHdr.pbDst, size);
if (This->acmStreamHdr.pbDst == NULL)
return AVIERR_MEMORY;
This->acmStreamHdr.dwDstUser = size;
}
This->acmStreamHdr.cbStruct = sizeof(This->acmStreamHdr);
This->acmStreamHdr.cbSrcLengthUsed = 0;
This->acmStreamHdr.cbDstLengthUsed = 0;
This->acmStreamHdr.cbDstLength = This->acmStreamHdr.dwDstUser;
/* need to prepare stream? */
This->acmStreamHdr.pbSrc = buffer;
This->acmStreamHdr.cbSrcLength = buffersize;
if ((This->acmStreamHdr.fdwStatus & ACMSTREAMHEADER_STATUSF_PREPARED) == 0) {
if (acmStreamPrepareHeader(This->has, &This->acmStreamHdr, 0) != S_OK) {
This->acmStreamHdr.pbSrc = NULL;
This->acmStreamHdr.cbSrcLength = 0;
return AVIERR_COMPRESSOR;
}
}
/* now do the conversion */
/* FIXME: use ACM_CONVERTF_* flags */
if (acmStreamConvert(This->has, &This->acmStreamHdr, 0) != S_OK)
hr = AVIERR_COMPRESSOR;
else
hr = AVIERR_OK;
This->acmStreamHdr.pbSrc = NULL;
This->acmStreamHdr.cbSrcLength = 0;
if (FAILED(hr))
return hr;
return IAVIStream_Write(This->pStream,-1,This->acmStreamHdr.cbDstLengthUsed /
This->lpOutFormat->nBlockAlign,This->acmStreamHdr.pbDst,
This->acmStreamHdr.cbDstLengthUsed,flags,sampwritten,
byteswritten);
}
static HRESULT WINAPI ACMStream_fnDelete(IAVIStream *iface, LONG start,
LONG samples)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,%d,%d)\n", iface, start, samples);
/* check parameters */
if (start < 0 || samples < 0)
return AVIERR_BADPARAM;
/* Delete before start of stream? */
if ((DWORD)(start + samples) < This->sInfo.dwStart)
return AVIERR_OK;
/* Delete after end of stream? */
if ((DWORD)start > This->sInfo.dwLength)
return AVIERR_OK;
/* For the rest we need write capability */
if ((This->sInfo.dwCaps & AVIFILECAPS_CANWRITE) == 0)
return AVIERR_READONLY;
/* A compressor is also necessary */
if (This->has == NULL)
return AVIERR_NOCOMPRESSOR;
/* map our positions to pStream positions */
CONVERT_THIS_to_STREAM(&start);
CONVERT_THIS_to_STREAM(&samples);
return IAVIStream_Delete(This->pStream, start, samples);
}
static HRESULT WINAPI ACMStream_fnReadData(IAVIStream *iface, DWORD fcc,
LPVOID lp, LPLONG lpread)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,0x%08X,%p,%p)\n", iface, fcc, lp, lpread);
assert(This->pStream != NULL);
return IAVIStream_ReadData(This->pStream, fcc, lp, lpread);
}
static HRESULT WINAPI ACMStream_fnWriteData(IAVIStream *iface, DWORD fcc,
LPVOID lp, LONG size)
{
IAVIStreamImpl *This = impl_from_IAVIStream(iface);
TRACE("(%p,0x%08x,%p,%d)\n", iface, fcc, lp, size);
assert(This->pStream != NULL);
return IAVIStream_WriteData(This->pStream, fcc, lp, size);
}
static HRESULT WINAPI ACMStream_fnSetInfo(IAVIStream *iface,
LPAVISTREAMINFOW info, LONG infolen)
{
FIXME("(%p,%p,%d): stub\n", iface, info, infolen);
return E_FAIL;
}
static const struct IAVIStreamVtbl iacmst = {
ACMStream_fnQueryInterface,
ACMStream_fnAddRef,
ACMStream_fnRelease,
ACMStream_fnCreate,
ACMStream_fnInfo,
ACMStream_fnFindSample,
ACMStream_fnReadFormat,
ACMStream_fnSetFormat,
ACMStream_fnRead,
ACMStream_fnWrite,
ACMStream_fnDelete,
ACMStream_fnReadData,
ACMStream_fnWriteData,
ACMStream_fnSetInfo
};
HRESULT AVIFILE_CreateACMStream(REFIID riid, LPVOID *ppv)
{
IAVIStreamImpl *pstream;
HRESULT hr;
assert(riid != NULL && ppv != NULL);
*ppv = NULL;
pstream = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IAVIStreamImpl));
if (pstream == NULL)
return AVIERR_MEMORY;
pstream->IAVIStream_iface.lpVtbl = &iacmst;
hr = IAVIStream_QueryInterface(&pstream->IAVIStream_iface, riid, ppv);
if (FAILED(hr))
HeapFree(GetProcessHeap(), 0, pstream);
return hr;
}