uint32_t WavReader_R32::SeekToChunk(int8_t cCode[4], uint8_t uiCodeLen) {
if (m_pFileHandle == NULL)
return false;
fseek(m_pFileHandle, 0, FILE_END);
uint32_t uiFileLength = ftell(m_pFileHandle);
fseek(m_pFileHandle, 12, FILE_BEGIN);
uint32_t uiCurrentPos = ftell(m_pFileHandle);
while (true) {
int8_t cReadCode[4] = { 0, 0, 0, 0 };
if (!ReadFOURCC(cReadCode))
return 0;
if (memcmp(cReadCode, cCode, uiCodeLen) == 0) {
uint32_t nChunkLength = ReadUINT32();
uint32_t nRestBytes = uiFileLength - ftell(m_pFileHandle);
if (nChunkLength > nRestBytes) {
uiCurrentPos++;
fseek(m_pFileHandle, uiCurrentPos, FILE_BEGIN);
continue;
}
return nChunkLength;
}
uiCurrentPos++;
fseek(m_pFileHandle, uiCurrentPos, FILE_BEGIN);
}
return 0;
}
// Parse the box from the stream
CNCSError CNCSJP2File::CNCSJP2SignatureBox::Parse(class CNCSJP2File &JP2File, CNCSJPCIOStream &Stream)
{
CNCSError Error;
NCSJP2_CHECKIO_BEGIN(Error, Stream);
// UINT8 buf[4];
// Read in the signature
// NCSJP2_CHECKIO(Read(buf, 4));
UINT32 buf;
NCSJP2_CHECKIO(ReadUINT32(buf));
if(memcmp(&sm_JP2Signature, &buf, sizeof(buf)) == 0) {
// Signature is valid
m_bValid = true;
} else {
Error = NCS_FILE_INVALID;
}
NCSJP2_CHECKIO_END();
return(Error);
}
void vtkDCMParser::ReadElement(DCMDataElementStruct *des)
{
if(this->file_in)
{
PrevFilePos = ftell(file_in);
PrevFileIOMessage = FileIOMessage;
switch(TransferSyntax)
{
case TFS_IVRLE:
case TFS_IVRBE:
des->GroupCode = ReadUINT16();
des->ElementCode = ReadUINT16();
des->Length = ReadUINT32();
des->NextBlock = ftell(file_in);
if(des->Length != 0xffffffff)
des->NextBlock += des->Length;
sprintf(des->VR, "??");
break;
case TFS_EVRLE:
case TFS_EVRBE:
des->GroupCode = ReadUINT16();
des->ElementCode = ReadUINT16();
if((des->GroupCode) == 0xfffe)
{
if((des->ElementCode == 0xe000) ||
(des->ElementCode == 0xe00d) ||
(des->ElementCode == 0xe0dd))
{ // must be implicit VR always
des->Length = ReadUINT32();
des->NextBlock = ftell(file_in);
if(des->Length != 0xffffffff)
des->NextBlock += des->Length;
sprintf(des->VR, "??");
return;
}
}
ReadText(des->VR, 2); // getting VR
if((strcmp(des->VR, "OB") == 0) ||
(strcmp(des->VR, "OW") == 0) ||
(strcmp(des->VR, "SQ") == 0) ||
(strcmp(des->VR, "UN") == 0) ||
(strcmp(des->VR, "UT") == 0)
)
{
des->Length = ReadUINT16(); // reserved field
des->Length = ReadUINT32();
des->NextBlock = ftell(file_in);
if(des->Length != 0xffffffff)
des->NextBlock += des->Length;
} else
{
des->Length = ReadUINT16();
des->NextBlock = ftell(file_in);
if(des->Length != 0xffffffff)
des->NextBlock += des->Length;
}
break;
}
}
}
bool WavReader_R32::OpenWavFile(const char *pszFilePathName) {
if (pszFilePathName == NULL)
return false;
if (strlen(pszFilePathName) <= 0)
return false;
if (m_fpSamples != NULL)
delete[] m_fpSamples;
if (m_pFileHandle != NULL)
fclose(m_pFileHandle);
m_fpSamples = NULL;
m_pFileHandle = NULL;
m_uiFrameCount = 0;
m_uiSamplingRate = 0;
m_uiChannels = 0;
m_pFileHandle = fopen(pszFilePathName, "rb");
if (m_pFileHandle == NULL)
return false;
int8_t cCode[4];
if (!ReadFOURCC(cCode))
return false;
if ((cCode[0] != 'R') || (cCode[1] != 'I') || (cCode[2] != 'F')
|| (cCode[3] != 'F'))
return false;
uint32_t uiRiffChunkDataSize = ReadUINT32();
if (uiRiffChunkDataSize == 0)
return false;
if (!ReadFOURCC(cCode))
return false;
if ((cCode[0] != 'W') || (cCode[1] != 'A') || (cCode[2] != 'V')
|| (cCode[3] != 'E'))
return false;
cCode[0] = 'f';
cCode[1] = 'm';
cCode[2] = 't';
uint32_t nFormatLength = SeekToChunk(cCode, 3);
if (nFormatLength < 16)
return false;
uint16_t nFormatTag = ReadUINT16();
if ((nFormatTag != 0x0001) && (nFormatTag != 0x0003))
return false;
uint16_t uiChannels = ReadUINT16();
if ((uiChannels != 1) && (uiChannels != 2))
return false;
uint32_t uiSampleRate = ReadUINT32();
ReadUINT32();
ReadUINT16();
uint16_t uiBitsPerSample = ReadUINT16();
if ((uiBitsPerSample != 8) && (uiBitsPerSample != 16)
&& (uiBitsPerSample != 24) && (uiBitsPerSample != 32))
return false;
cCode[0] = 'd';
cCode[1] = 'a';
cCode[2] = 't';
cCode[3] = 'a';
uint32_t uiDataSize = SeekToChunk(cCode, 4);
uint32_t uiFrameCount = uiDataSize / (uiBitsPerSample / 8) / uiChannels;
if (uiFrameCount == 0)
return false;
if (nFormatTag == 0x0003) {
m_fpSamples = new float[uiFrameCount * uiChannels];
if (m_fpSamples == NULL)
return false;
uint32_t nReadFrameCount = (uint32_t) fread(m_fpSamples, sizeof(float),
uiFrameCount * uiChannels,
m_pFileHandle);
if (nReadFrameCount != uiFrameCount * uiChannels) {
delete[] m_fpSamples;
return false;
}
m_uiFrameCount = uiFrameCount;
m_uiSamplingRate = uiSampleRate;
m_uiChannels = uiChannels;
return true;
} else {
uint32_t uiReadDataLength = uiFrameCount * uiChannels
* (uiBitsPerSample / 8);
uint8_t *ucFrameBuffer = new uint8_t[uiReadDataLength];
if (ucFrameBuffer == NULL)
return false;
uint32_t nReadFrameCount = (uint32_t) fread(ucFrameBuffer,
sizeof(uint8_t),
uiReadDataLength,
m_pFileHandle);
if (nReadFrameCount != uiReadDataLength) {
delete[] ucFrameBuffer;
return false;
}
m_fpSamples = new float[uiFrameCount * uiChannels];
if (m_fpSamples == NULL) {
delete[] ucFrameBuffer;
return false;
}
switch (uiBitsPerSample) {
case 8:
ConvertInt8ToFloat32(ucFrameBuffer, uiFrameCount, uiChannels,
m_fpSamples);
break;
case 16:
ConvertInt16ToFloat32((int16_t*) ucFrameBuffer, uiFrameCount,
uiChannels, m_fpSamples);
break;
case 24:
ConvertInt24ToFloat32(ucFrameBuffer, uiFrameCount, uiChannels,
m_fpSamples);
break;
case 32:
ConvertInt32ToFloat32((int32_t*) ucFrameBuffer, uiFrameCount,
uiChannels, m_fpSamples);
break;
}
delete[] ucFrameBuffer;
m_uiFrameCount = uiFrameCount;
m_uiSamplingRate = uiSampleRate;
m_uiChannels = uiChannels;
return true;
}
return false;
}
