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pcsx2/3rdparty/baseclasses/mtype.cpp

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//------------------------------------------------------------------------------
// File: MType.cpp
//
// Desc: DirectShow base classes - implements a class that holds and
// manages media type information.
//
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
// helper class that derived pin objects can use to compare media
// types etc. Has same data members as the struct AM_MEDIA_TYPE defined
// in the streams IDL file, but also has (non-virtual) functions
#include <streams.h>
#include <mmreg.h>
CMediaType::~CMediaType(){
FreeMediaType(*this);
}
CMediaType::CMediaType()
{
InitMediaType();
}
CMediaType::CMediaType(const GUID * type)
{
InitMediaType();
majortype = *type;
}
// copy constructor does a deep copy of the format block
CMediaType::CMediaType(const AM_MEDIA_TYPE& rt, __out_opt HRESULT* phr)
{
HRESULT hr = CopyMediaType(this, &rt);
if (FAILED(hr) && (NULL != phr)) {
*phr = hr;
}
}
CMediaType::CMediaType(const CMediaType& rt, __out_opt HRESULT* phr)
{
HRESULT hr = CopyMediaType(this, &rt);
if (FAILED(hr) && (NULL != phr)) {
*phr = hr;
}
}
// this class inherits publicly from AM_MEDIA_TYPE so the compiler could generate
// the following assignment operator itself, however it could introduce some
// memory conflicts and leaks in the process because the structure contains
// a dynamically allocated block (pbFormat) which it will not copy correctly
CMediaType&
CMediaType::operator=(const AM_MEDIA_TYPE& rt)
{
Set(rt);
return *this;
}
CMediaType&
CMediaType::operator=(const CMediaType& rt)
{
*this = (AM_MEDIA_TYPE &) rt;
return *this;
}
BOOL
CMediaType::operator == (const CMediaType& rt) const
{
// I don't believe we need to check sample size or
// temporal compression flags, since I think these must
// be represented in the type, subtype and format somehow. They
// are pulled out as separate flags so that people who don't understand
// the particular format representation can still see them, but
// they should duplicate information in the format block.
return ((IsEqualGUID(majortype,rt.majortype) == TRUE) &&
(IsEqualGUID(subtype,rt.subtype) == TRUE) &&
(IsEqualGUID(formattype,rt.formattype) == TRUE) &&
(cbFormat == rt.cbFormat) &&
( (cbFormat == 0) ||
pbFormat != NULL && rt.pbFormat != NULL &&
(memcmp(pbFormat, rt.pbFormat, cbFormat) == 0)));
}
BOOL
CMediaType::operator != (const CMediaType& rt) const
{
/* Check to see if they are equal */
if (*this == rt) {
return FALSE;
}
return TRUE;
}
HRESULT
CMediaType::Set(const CMediaType& rt)
{
return Set((AM_MEDIA_TYPE &) rt);
}
HRESULT
CMediaType::Set(const AM_MEDIA_TYPE& rt)
{
if (&rt != this) {
FreeMediaType(*this);
HRESULT hr = CopyMediaType(this, &rt);
if (FAILED(hr)) {
return E_OUTOFMEMORY;
}
}
return S_OK;
}
BOOL
CMediaType::IsValid() const
{
return (!IsEqualGUID(majortype,GUID_NULL));
}
void
CMediaType::SetType(const GUID* ptype)
{
majortype = *ptype;
}
void
CMediaType::SetSubtype(const GUID* ptype)
{
subtype = *ptype;
}
ULONG
CMediaType::GetSampleSize() const {
if (IsFixedSize()) {
return lSampleSize;
} else {
return 0;
}
}
void
CMediaType::SetSampleSize(ULONG sz) {
if (sz == 0) {
SetVariableSize();
} else {
bFixedSizeSamples = TRUE;
lSampleSize = sz;
}
}
void
CMediaType::SetVariableSize() {
bFixedSizeSamples = FALSE;
}
void
CMediaType::SetTemporalCompression(BOOL bCompressed) {
bTemporalCompression = bCompressed;
}
BOOL
CMediaType::SetFormat(__in_bcount(cb) BYTE * pformat, ULONG cb)
{
if (NULL == AllocFormatBuffer(cb))
return(FALSE);
ASSERT(pbFormat);
memcpy(pbFormat, pformat, cb);
return(TRUE);
}
// set the type of the media type format block, this type defines what you
// will actually find in the format pointer. For example FORMAT_VideoInfo or
// FORMAT_WaveFormatEx. In the future this may be an interface pointer to a
// property set. Before sending out media types this should be filled in.
void
CMediaType::SetFormatType(const GUID *pformattype)
{
formattype = *pformattype;
}
// reset the format buffer
void CMediaType::ResetFormatBuffer()
{
if (cbFormat) {
CoTaskMemFree((PVOID)pbFormat);
}
cbFormat = 0;
pbFormat = NULL;
}
// allocate length bytes for the format and return a read/write pointer
// If we cannot allocate the new block of memory we return NULL leaving
// the original block of memory untouched (as does ReallocFormatBuffer)
BYTE*
CMediaType::AllocFormatBuffer(ULONG length)
{
ASSERT(length);
// do the types have the same buffer size
if (cbFormat == length) {
return pbFormat;
}
// allocate the new format buffer
BYTE *pNewFormat = (PBYTE)CoTaskMemAlloc(length);
if (pNewFormat == NULL) {
if (length <= cbFormat) return pbFormat; //reuse the old block anyway.
return NULL;
}
// delete the old format
if (cbFormat != 0) {
ASSERT(pbFormat);
CoTaskMemFree((PVOID)pbFormat);
}
cbFormat = length;
pbFormat = pNewFormat;
return pbFormat;
}
// reallocate length bytes for the format and return a read/write pointer
// to it. We keep as much information as we can given the new buffer size
// if this fails the original format buffer is left untouched. The caller
// is responsible for ensuring the size of memory required is non zero
BYTE*
CMediaType::ReallocFormatBuffer(ULONG length)
{
ASSERT(length);
// do the types have the same buffer size
if (cbFormat == length) {
return pbFormat;
}
// allocate the new format buffer
BYTE *pNewFormat = (PBYTE)CoTaskMemAlloc(length);
if (pNewFormat == NULL) {
if (length <= cbFormat) return pbFormat; //reuse the old block anyway.
return NULL;
}
// copy any previous format (or part of if new is smaller)
// delete the old format and replace with the new one
if (cbFormat != 0) {
ASSERT(pbFormat);
memcpy(pNewFormat,pbFormat,min(length,cbFormat));
CoTaskMemFree((PVOID)pbFormat);
}
cbFormat = length;
pbFormat = pNewFormat;
return pNewFormat;
}
// initialise a media type structure
void CMediaType::InitMediaType()
{
ZeroMemory((PVOID)this, sizeof(*this));
lSampleSize = 1;
bFixedSizeSamples = TRUE;
}
// a partially specified media type can be passed to IPin::Connect
// as a constraint on the media type used in the connection.
// the type, subtype or format type can be null.
BOOL
CMediaType::IsPartiallySpecified(void) const
{
if ((majortype == GUID_NULL) ||
(formattype == GUID_NULL)) {
return TRUE;
} else {
return FALSE;
}
}
BOOL
CMediaType::MatchesPartial(const CMediaType* ppartial) const
{
if ((ppartial->majortype != GUID_NULL) &&
(majortype != ppartial->majortype)) {
return FALSE;
}
if ((ppartial->subtype != GUID_NULL) &&
(subtype != ppartial->subtype)) {
return FALSE;
}
if (ppartial->formattype != GUID_NULL) {
// if the format block is specified then it must match exactly
if (formattype != ppartial->formattype) {
return FALSE;
}
if (cbFormat != ppartial->cbFormat) {
return FALSE;
}
if ((cbFormat != 0) &&
(memcmp(pbFormat, ppartial->pbFormat, cbFormat) != 0)) {
return FALSE;
}
}
return TRUE;
}
// general purpose function to delete a heap allocated AM_MEDIA_TYPE structure
// which is useful when calling IEnumMediaTypes::Next as the interface
// implementation allocates the structures which you must later delete
// the format block may also be a pointer to an interface to release
void WINAPI DeleteMediaType(__inout_opt AM_MEDIA_TYPE *pmt)
{
// allow NULL pointers for coding simplicity
if (pmt == NULL) {
return;
}
FreeMediaType(*pmt);
CoTaskMemFree((PVOID)pmt);
}
// this also comes in useful when using the IEnumMediaTypes interface so
// that you can copy a media type, you can do nearly the same by creating
// a CMediaType object but as soon as it goes out of scope the destructor
// will delete the memory it allocated (this takes a copy of the memory)
AM_MEDIA_TYPE * WINAPI CreateMediaType(AM_MEDIA_TYPE const *pSrc)
{
ASSERT(pSrc);
// Allocate a block of memory for the media type
AM_MEDIA_TYPE *pMediaType =
(AM_MEDIA_TYPE *)CoTaskMemAlloc(sizeof(AM_MEDIA_TYPE));
if (pMediaType == NULL) {
return NULL;
}
// Copy the variable length format block
HRESULT hr = CopyMediaType(pMediaType,pSrc);
if (FAILED(hr)) {
CoTaskMemFree((PVOID)pMediaType);
return NULL;
}
return pMediaType;
}
// Copy 1 media type to another
HRESULT WINAPI CopyMediaType(__out AM_MEDIA_TYPE *pmtTarget, const AM_MEDIA_TYPE *pmtSource)
{
// We'll leak if we copy onto one that already exists - there's one
// case we can check like that - copying to itself.
ASSERT(pmtSource != pmtTarget);
*pmtTarget = *pmtSource;
if (pmtSource->cbFormat != 0) {
ASSERT(pmtSource->pbFormat != NULL);
pmtTarget->pbFormat = (PBYTE)CoTaskMemAlloc(pmtSource->cbFormat);
if (pmtTarget->pbFormat == NULL) {
pmtTarget->cbFormat = 0;
return E_OUTOFMEMORY;
} else {
CopyMemory((PVOID)pmtTarget->pbFormat, (PVOID)pmtSource->pbFormat,
pmtTarget->cbFormat);
}
}
if (pmtTarget->pUnk != NULL) {
pmtTarget->pUnk->AddRef();
}
return S_OK;
}
// Free an existing media type (ie free resources it holds)
void WINAPI FreeMediaType(__inout AM_MEDIA_TYPE& mt)
{
if (mt.cbFormat != 0) {
CoTaskMemFree((PVOID)mt.pbFormat);
// Strictly unnecessary but tidier
mt.cbFormat = 0;
mt.pbFormat = NULL;
}
if (mt.pUnk != NULL) {
mt.pUnk->Release();
mt.pUnk = NULL;
}
}
// Initialize a media type from a WAVEFORMATEX
STDAPI CreateAudioMediaType(
const WAVEFORMATEX *pwfx,
__out AM_MEDIA_TYPE *pmt,
BOOL bSetFormat
)
{
pmt->majortype = MEDIATYPE_Audio;
if (pwfx->wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
pmt->subtype = ((PWAVEFORMATEXTENSIBLE)pwfx)->SubFormat;
} else {
pmt->subtype = FOURCCMap(pwfx->wFormatTag);
}
pmt->formattype = FORMAT_WaveFormatEx;
pmt->bFixedSizeSamples = TRUE;
pmt->bTemporalCompression = FALSE;
pmt->lSampleSize = pwfx->nBlockAlign;
pmt->pUnk = NULL;
if (bSetFormat) {
if (pwfx->wFormatTag == WAVE_FORMAT_PCM) {
pmt->cbFormat = sizeof(WAVEFORMATEX);
} else {
pmt->cbFormat = sizeof(WAVEFORMATEX) + pwfx->cbSize;
}
pmt->pbFormat = (PBYTE)CoTaskMemAlloc(pmt->cbFormat);
if (pmt->pbFormat == NULL) {
return E_OUTOFMEMORY;
}
if (pwfx->wFormatTag == WAVE_FORMAT_PCM) {
CopyMemory(pmt->pbFormat, pwfx, sizeof(PCMWAVEFORMAT));
((WAVEFORMATEX *)pmt->pbFormat)->cbSize = 0;
} else {
CopyMemory(pmt->pbFormat, pwfx, pmt->cbFormat);
}
}
return S_OK;
}
// eliminate very many spurious warnings from MS compiler
#pragma warning(disable:4514)
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