private Collection <RecognizedPhrase> ExtractAlternates(int numberOfAlternates, bool isSapi53Header)
{
Collection <RecognizedPhrase> alternates = new();
if (numberOfAlternates > 0)
{
GCHandle gc = GCHandle.Alloc(_sapiAlternatesBlob, GCHandleType.Pinned);
try
{
IntPtr buffer = gc.AddrOfPinnedObject();
int sizeOfSpSerializedPhraseAlt = Marshal.SizeOf <SPSERIALIZEDPHRASEALT>();
int offset = 0;
for (int i = 0; i < numberOfAlternates; i++)
{
IntPtr altBuffer = new((long)buffer + offset);
SPSERIALIZEDPHRASEALT alt = Marshal.PtrToStructure <SPSERIALIZEDPHRASEALT>(altBuffer);
offset += sizeOfSpSerializedPhraseAlt; // advance over SPSERIALIZEDPHRASEALT
if (isSapi53Header)
{
offset += (int)((alt.cbAltExtra + 7) & ~7); // advance over extra data with alignment padding
}
else
{
offset += (int)alt.cbAltExtra; // no alignment padding
}
// we cannot use a constructor parameter because RecognitionResult also derives from RecognizedPhrase
IntPtr phraseBuffer = new((long)buffer + offset);
SPSERIALIZEDPHRASE serializedPhrase = RecognizedPhrase.GetPhraseHeader(phraseBuffer, _header.ulPhraseAltDataSize - (uint)offset, _isSapi53Header);
int serializedPhraseSize = (int)serializedPhrase.ulSerializedSize;
RecognizedPhrase phrase = new();
// Get the alphabet of the raw phrase alternate, which should be the same as the engine
bool hasIPAPronunciation = (_header.fAlphabet & (uint)SPRESULTALPHABET.SPRA_ENGINE_UPS) != 0;
phrase.InitializeFromSerializedBuffer(this, serializedPhrase, phraseBuffer, serializedPhraseSize, isSapi53Header, hasIPAPronunciation);
if (isSapi53Header)
{
offset += ((serializedPhraseSize + 7) & ~7); // advance over phrase with alignment padding
}
else
{
offset += serializedPhraseSize; // advance over phrase
}
alternates.Add(phrase);
}
}
finally
{
gc.Free();
}
}
return(alternates);
}
private void Initialize(IRecognizerInternal recognizer, ISpRecoResult recoResult, byte[] sapiResultBlob, int maxAlternates)
{
_recognizer = recognizer;
_maxAlternates = maxAlternates;
try
{
_sapiRecoResult = (recoResult as ISpRecoResult2);
}
catch (COMException)
{
_sapiRecoResult = null;
}
GCHandle gCHandle = GCHandle.Alloc(sapiResultBlob, GCHandleType.Pinned);
try
{
IntPtr intPtr = gCHandle.AddrOfPinnedObject();
int num = Marshal.ReadInt32(intPtr, 4);
if (num == Marshal.SizeOf(typeof(SPRESULTHEADER_Sapi51)))
{
SPRESULTHEADER_Sapi51 source = (SPRESULTHEADER_Sapi51)Marshal.PtrToStructure(intPtr, typeof(SPRESULTHEADER_Sapi51));
_header = new SPRESULTHEADER(source);
_isSapi53Header = false;
}
else
{
_header = (SPRESULTHEADER)Marshal.PtrToStructure(intPtr, typeof(SPRESULTHEADER));
_isSapi53Header = true;
}
_header.Validate();
IntPtr phraseBuffer = new IntPtr((long)intPtr + (int)_header.ulPhraseOffset);
SPSERIALIZEDPHRASE phraseHeader = RecognizedPhrase.GetPhraseHeader(phraseBuffer, _header.ulPhraseDataSize, _isSapi53Header);
bool hasIPAPronunciation = (_header.fAlphabet & 1) != 0;
InitializeFromSerializedBuffer(this, phraseHeader, phraseBuffer, (int)_header.ulPhraseDataSize, _isSapi53Header, hasIPAPronunciation);
if (recoResult != null)
{
ExtractDictationAlternates(recoResult, maxAlternates);
recoResult.Discard(255u);
}
}
finally
{
gCHandle.Free();
}
_sapiAudioBlob = new byte[_header.ulRetainedDataSize];
Array.Copy(sapiResultBlob, (int)_header.ulRetainedOffset, _sapiAudioBlob, 0, (int)_header.ulRetainedDataSize);
_sapiAlternatesBlob = new byte[_header.ulPhraseAltDataSize];
Array.Copy(sapiResultBlob, (int)_header.ulPhraseAltOffset, _sapiAlternatesBlob, 0, (int)_header.ulPhraseAltDataSize);
}
private void ExtractDictationAlternates(ISpRecoResult recoResult, int maxAlternates)
{
if (recoResult != null && base.Grammar is DictationGrammar)
{
_alternates = new Collection <RecognizedPhrase>();
IntPtr[] array = new IntPtr[maxAlternates];
try
{
recoResult.GetAlternates(0, -1, maxAlternates, array, out maxAlternates);
}
catch (COMException)
{
maxAlternates = 0;
}
for (uint num = 0u; num < maxAlternates; num++)
{
ISpPhraseAlt spPhraseAlt = (ISpPhraseAlt)Marshal.GetObjectForIUnknown(array[num]);
try
{
IntPtr ppCoMemPhrase;
spPhraseAlt.GetSerializedPhrase(out ppCoMemPhrase);
try
{
RecognizedPhrase recognizedPhrase = new RecognizedPhrase();
SPSERIALIZEDPHRASE phraseHeader = RecognizedPhrase.GetPhraseHeader(ppCoMemPhrase, uint.MaxValue, _isSapi53Header);
bool hasIPAPronunciation = (_header.fAlphabet & 1) != 0;
recognizedPhrase.InitializeFromSerializedBuffer(this, phraseHeader, ppCoMemPhrase, (int)phraseHeader.ulSerializedSize, _isSapi53Header, hasIPAPronunciation);
_alternates.Add(recognizedPhrase);
}
finally
{
Marshal.FreeCoTaskMem(ppCoMemPhrase);
}
}
finally
{
Marshal.Release(array[num]);
}
}
}
}
private Collection <RecognizedPhrase> ExtractAlternates(int numberOfAlternates, bool isSapi53Header)
{
Collection <RecognizedPhrase> collection = new Collection <RecognizedPhrase>();
if (numberOfAlternates > 0)
{
GCHandle gCHandle = GCHandle.Alloc(_sapiAlternatesBlob, GCHandleType.Pinned);
try
{
IntPtr value = gCHandle.AddrOfPinnedObject();
int num = Marshal.SizeOf(typeof(SPSERIALIZEDPHRASEALT));
int num2 = 0;
for (int i = 0; i < numberOfAlternates; i++)
{
IntPtr ptr = new IntPtr((long)value + num2);
SPSERIALIZEDPHRASEALT sPSERIALIZEDPHRASEALT = (SPSERIALIZEDPHRASEALT)Marshal.PtrToStructure(ptr, typeof(SPSERIALIZEDPHRASEALT));
num2 += num;
num2 = ((!isSapi53Header) ? (num2 + (int)sPSERIALIZEDPHRASEALT.cbAltExtra) : (num2 + (int)((sPSERIALIZEDPHRASEALT.cbAltExtra + 7) & -8)));
IntPtr phraseBuffer = new IntPtr((long)value + num2);
SPSERIALIZEDPHRASE phraseHeader = RecognizedPhrase.GetPhraseHeader(phraseBuffer, (uint)((int)_header.ulPhraseAltDataSize - num2), _isSapi53Header);
int ulSerializedSize = (int)phraseHeader.ulSerializedSize;
RecognizedPhrase recognizedPhrase = new RecognizedPhrase();
bool hasIPAPronunciation = (_header.fAlphabet & 2) != 0;
recognizedPhrase.InitializeFromSerializedBuffer(this, phraseHeader, phraseBuffer, ulSerializedSize, isSapi53Header, hasIPAPronunciation);
num2 = ((!isSapi53Header) ? (num2 + ulSerializedSize) : (num2 + ((ulSerializedSize + 7) & -8)));
collection.Add(recognizedPhrase);
}
return(collection);
}
finally
{
gCHandle.Free();
}
}
return(collection);
}
private void ExtractDictationAlternates(ISpRecoResult recoResult, int maxAlternates)
{
// Get the alternates for dictation
// alternates for dictation are not part of the recognition results and must be pulled out
// from the recognition result bits.
if (recoResult != null) // recoResult is null if we are in the case of our unit test.
{
if (Grammar is DictationGrammar)
{
_alternates = new Collection <RecognizedPhrase>();
IntPtr[] sapiAlternates = new IntPtr[maxAlternates];
try
{
recoResult.GetAlternates(0, -1, maxAlternates, sapiAlternates, out maxAlternates);
}
catch (COMException)
{
// In some cases such as when the dictation grammar has been unloaded, the engine may not be able
// to provide the alternates. We set the alternate list to empty.
maxAlternates = 0;
}
//InnerList.Capacity = (int)numSapiAlternates;
for (uint i = 0; i < maxAlternates; i++)
{
ISpPhraseAlt phraseAlt = (ISpPhraseAlt)Marshal.GetObjectForIUnknown(sapiAlternates[i]);
try
{
IntPtr coMemSerializedPhrase;
phraseAlt.GetSerializedPhrase(out coMemSerializedPhrase);
try
{
// Build a recognition phrase result
RecognizedPhrase phrase = new();
// we cannot use a constructor parameter because RecognitionResult also derives from RecognizedPhrase
SPSERIALIZEDPHRASE serializedPhrase = RecognizedPhrase.GetPhraseHeader(coMemSerializedPhrase, uint.MaxValue, _isSapi53Header);
//
// If we are getting the alternates from SAPI, the alphabet should have already been converted
// to the alphabet we (applications) want.
//
bool hasIPAPronunciation = (_header.fAlphabet & (uint)SPRESULTALPHABET.SPRA_APP_UPS) != 0;
phrase.InitializeFromSerializedBuffer(this, serializedPhrase, coMemSerializedPhrase, (int)serializedPhrase.ulSerializedSize, _isSapi53Header, hasIPAPronunciation);
_alternates.Add(phrase);
}
finally
{
Marshal.FreeCoTaskMem(coMemSerializedPhrase);
}
}
finally
{
Marshal.Release(sapiAlternates[i]);
}
}
}
}
}
private void Initialize(IRecognizerInternal recognizer, ISpRecoResult recoResult, byte[] sapiResultBlob, int maxAlternates)
{
// record parameters
_recognizer = recognizer;
_maxAlternates = maxAlternates;
try
{
_sapiRecoResult = recoResult as ISpRecoResult2;
}
catch (COMException)
{
_sapiRecoResult = null;
}
GCHandle gc = GCHandle.Alloc(sapiResultBlob, GCHandleType.Pinned);
try
{
IntPtr buffer = gc.AddrOfPinnedObject();
int headerSize = Marshal.ReadInt32(buffer, 4); // Read header size directly from buffer - 4 is the offset of cbHeaderSize.
if (headerSize == Marshal.SizeOf <SPRESULTHEADER_Sapi51>()) // SAPI 5.1 size
{
SPRESULTHEADER_Sapi51 legacyHeader = Marshal.PtrToStructure <SPRESULTHEADER_Sapi51>(buffer);
_header = new SPRESULTHEADER(legacyHeader);
_isSapi53Header = false;
}
else
{
_header = Marshal.PtrToStructure <SPRESULTHEADER>(buffer);
_isSapi53Header = true;
}
// Validate the header fields
_header.Validate();
// initialize the parent to be this result - this is needed for the homophones
IntPtr phraseBuffer = new((long)buffer + (int)_header.ulPhraseOffset);
SPSERIALIZEDPHRASE serializedPhrase = RecognizedPhrase.GetPhraseHeader(phraseBuffer, _header.ulPhraseDataSize, _isSapi53Header);
// Get the alphabet of the main phrase, which should be the same as the current alphabet selected by us (applications).
bool hasIPAPronunciation = (_header.fAlphabet & (uint)SPRESULTALPHABET.SPRA_APP_UPS) != 0;
InitializeFromSerializedBuffer(this, serializedPhrase, phraseBuffer, (int)_header.ulPhraseDataSize, _isSapi53Header, hasIPAPronunciation);
if (recoResult != null)
{
ExtractDictationAlternates(recoResult, maxAlternates);
// Since we took ownership of this unmanaged object we can discard information that don't need.
recoResult.Discard(SapiConstants.SPDF_ALL);
}
}
finally
{
gc.Free();
}
// save the sapi blobs splitting it in the relevant bits
// audio
_sapiAudioBlob = new byte[(int)_header.ulRetainedDataSize];
Array.Copy(sapiResultBlob, (int)_header.ulRetainedOffset, _sapiAudioBlob, 0, (int)_header.ulRetainedDataSize);
// alternates
_sapiAlternatesBlob = new byte[(int)_header.ulPhraseAltDataSize];
Array.Copy(sapiResultBlob, (int)_header.ulPhraseAltOffset, _sapiAlternatesBlob, 0, (int)_header.ulPhraseAltDataSize);
}