255 |
|
|
256 |
|
|
257 |
|
|
258 |
|
// *************** Internal CRC-32 (Cyclic Redundancy Check) functions *************** |
259 |
|
// * |
260 |
|
|
261 |
|
static uint32_t* __initCRCTable() { |
262 |
|
static uint32_t res[256]; |
263 |
|
|
264 |
|
for (int i = 0 ; i < 256 ; i++) { |
265 |
|
uint32_t c = i; |
266 |
|
for (int j = 0 ; j < 8 ; j++) { |
267 |
|
c = (c & 1) ? 0xedb88320 ^ (c >> 1) : c >> 1; |
268 |
|
} |
269 |
|
res[i] = c; |
270 |
|
} |
271 |
|
return res; |
272 |
|
} |
273 |
|
|
274 |
|
static const uint32_t* __CRCTable = __initCRCTable(); |
275 |
|
|
276 |
|
/** |
277 |
|
* Initialize a CRC variable. |
278 |
|
* |
279 |
|
* @param crc - variable to be initialized |
280 |
|
*/ |
281 |
|
inline static void __resetCRC(uint32_t& crc) { |
282 |
|
crc = 0xffffffff; |
283 |
|
} |
284 |
|
|
285 |
|
/** |
286 |
|
* Used to calculate checksums of the sample data in a gig file. The |
287 |
|
* checksums are stored in the 3crc chunk of the gig file and |
288 |
|
* automatically updated when a sample is written with Sample::Write(). |
289 |
|
* |
290 |
|
* One should call __resetCRC() to initialize the CRC variable to be |
291 |
|
* used before calling this function the first time. |
292 |
|
* |
293 |
|
* After initializing the CRC variable one can call this function |
294 |
|
* arbitrary times, i.e. to split the overall CRC calculation into |
295 |
|
* steps. |
296 |
|
* |
297 |
|
* Once the whole data was processed by __calculateCRC(), one should |
298 |
|
* call __encodeCRC() to get the final CRC result. |
299 |
|
* |
300 |
|
* @param buf - pointer to data the CRC shall be calculated of |
301 |
|
* @param bufSize - size of the data to be processed |
302 |
|
* @param crc - variable the CRC sum shall be stored to |
303 |
|
*/ |
304 |
|
static void __calculateCRC(unsigned char* buf, int bufSize, uint32_t& crc) { |
305 |
|
for (int i = 0 ; i < bufSize ; i++) { |
306 |
|
crc = __CRCTable[(crc ^ buf[i]) & 0xff] ^ (crc >> 8); |
307 |
|
} |
308 |
|
} |
309 |
|
|
310 |
|
/** |
311 |
|
* Returns the final CRC result. |
312 |
|
* |
313 |
|
* @param crc - variable previously passed to __calculateCRC() |
314 |
|
*/ |
315 |
|
inline static uint32_t __encodeCRC(const uint32_t& crc) { |
316 |
|
return crc ^ 0xffffffff; |
317 |
|
} |
318 |
|
|
319 |
|
|
320 |
|
|
321 |
// *************** Other Internal functions *************** |
// *************** Other Internal functions *************** |
322 |
// * |
// * |
323 |
|
|
341 |
|
|
342 |
|
|
343 |
|
|
|
// *************** CRC *************** |
|
|
// * |
|
|
|
|
|
const uint32_t* CRC::table(initTable()); |
|
|
|
|
|
uint32_t* CRC::initTable() { |
|
|
uint32_t* res = new uint32_t[256]; |
|
|
|
|
|
for (int i = 0 ; i < 256 ; i++) { |
|
|
uint32_t c = i; |
|
|
for (int j = 0 ; j < 8 ; j++) { |
|
|
c = (c & 1) ? 0xedb88320 ^ (c >> 1) : c >> 1; |
|
|
} |
|
|
res[i] = c; |
|
|
} |
|
|
return res; |
|
|
} |
|
|
|
|
|
|
|
|
|
|
344 |
// *************** Sample *************** |
// *************** Sample *************** |
345 |
// * |
// * |
346 |
|
|
366 |
* is located, 0 otherwise |
* is located, 0 otherwise |
367 |
*/ |
*/ |
368 |
Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) { |
Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) { |
369 |
static const DLS::Info::FixedStringLength fixedStringLengths[] = { |
static const DLS::Info::string_length_t fixedStringLengths[] = { |
370 |
{ CHUNK_ID_INAM, 64 }, |
{ CHUNK_ID_INAM, 64 }, |
371 |
{ 0, 0 } |
{ 0, 0 } |
372 |
}; |
}; |
373 |
pInfo->FixedStringLengths = fixedStringLengths; |
pInfo->SetFixedStringLengths(fixedStringLengths); |
374 |
Instances++; |
Instances++; |
375 |
FileNo = fileNo; |
FileNo = fileNo; |
376 |
|
|
377 |
|
__resetCRC(crc); |
378 |
|
|
379 |
pCk3gix = waveList->GetSubChunk(CHUNK_ID_3GIX); |
pCk3gix = waveList->GetSubChunk(CHUNK_ID_3GIX); |
380 |
if (pCk3gix) { |
if (pCk3gix) { |
381 |
uint16_t iSampleGroup = pCk3gix->ReadInt16(); |
uint16_t iSampleGroup = pCk3gix->ReadInt16(); |
1213 |
// if this is the first write in this sample, reset the |
// if this is the first write in this sample, reset the |
1214 |
// checksum calculator |
// checksum calculator |
1215 |
if (pCkData->GetPos() == 0) { |
if (pCkData->GetPos() == 0) { |
1216 |
crc.reset(); |
__resetCRC(crc); |
1217 |
} |
} |
1218 |
if (GetSize() < SampleCount) throw Exception("Could not write sample data, current sample size to small"); |
if (GetSize() < SampleCount) throw Exception("Could not write sample data, current sample size to small"); |
1219 |
unsigned long res; |
unsigned long res; |
1223 |
res = Channels == 2 ? pCkData->Write(pBuffer, SampleCount << 1, 2) >> 1 |
res = Channels == 2 ? pCkData->Write(pBuffer, SampleCount << 1, 2) >> 1 |
1224 |
: pCkData->Write(pBuffer, SampleCount, 2); |
: pCkData->Write(pBuffer, SampleCount, 2); |
1225 |
} |
} |
1226 |
crc.update((unsigned char *)pBuffer, SampleCount * FrameSize); |
__calculateCRC((unsigned char *)pBuffer, SampleCount * FrameSize, crc); |
1227 |
|
|
1228 |
// if this is the last write, update the checksum chunk in the |
// if this is the last write, update the checksum chunk in the |
1229 |
// file |
// file |
1230 |
if (pCkData->GetPos() == pCkData->GetSize()) { |
if (pCkData->GetPos() == pCkData->GetSize()) { |
1231 |
File* pFile = static_cast<File*>(GetParent()); |
File* pFile = static_cast<File*>(GetParent()); |
1232 |
pFile->SetSampleChecksum(this, crc.getValue()); |
pFile->SetSampleChecksum(this, __encodeCRC(crc)); |
1233 |
} |
} |
1234 |
return res; |
return res; |
1235 |
} |
} |
2924 |
// * |
// * |
2925 |
|
|
2926 |
Instrument::Instrument(File* pFile, RIFF::List* insList, progress_t* pProgress) : DLS::Instrument((DLS::File*)pFile, insList) { |
Instrument::Instrument(File* pFile, RIFF::List* insList, progress_t* pProgress) : DLS::Instrument((DLS::File*)pFile, insList) { |
2927 |
static const DLS::Info::FixedStringLength fixedStringLengths[] = { |
static const DLS::Info::string_length_t fixedStringLengths[] = { |
2928 |
{ CHUNK_ID_INAM, 64 }, |
{ CHUNK_ID_INAM, 64 }, |
2929 |
{ CHUNK_ID_ISFT, 12 }, |
{ CHUNK_ID_ISFT, 12 }, |
2930 |
{ 0, 0 } |
{ 0, 0 } |
2931 |
}; |
}; |
2932 |
pInfo->FixedStringLengths = fixedStringLengths; |
pInfo->SetFixedStringLengths(fixedStringLengths); |
2933 |
|
|
2934 |
// Initialization |
// Initialization |
2935 |
for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL; |
for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL; |
3227 |
// *************** File *************** |
// *************** File *************** |
3228 |
// * |
// * |
3229 |
|
|
3230 |
// File version 2.0, 1998-06-28 |
/// Reflects Gigasampler file format version 2.0 (1998-06-28). |
3231 |
const DLS::version_t File::VERSION_2 = { |
const DLS::version_t File::VERSION_2 = { |
3232 |
0, 2, 19980628 & 0xffff, 19980628 >> 16 |
0, 2, 19980628 & 0xffff, 19980628 >> 16 |
3233 |
}; |
}; |
3234 |
|
|
3235 |
// File version 3.0, 2003-03-31 |
/// Reflects Gigasampler file format version 3.0 (2003-03-31). |
3236 |
const DLS::version_t File::VERSION_3 = { |
const DLS::version_t File::VERSION_3 = { |
3237 |
0, 3, 20030331 & 0xffff, 20030331 >> 16 |
0, 3, 20030331 & 0xffff, 20030331 >> 16 |
3238 |
}; |
}; |
3239 |
|
|
3240 |
const DLS::Info::FixedStringLength File::FixedStringLengths[] = { |
static const DLS::Info::string_length_t _FileFixedStringLengths[] = { |
3241 |
{ CHUNK_ID_IARL, 256 }, |
{ CHUNK_ID_IARL, 256 }, |
3242 |
{ CHUNK_ID_IART, 128 }, |
{ CHUNK_ID_IART, 128 }, |
3243 |
{ CHUNK_ID_ICMS, 128 }, |
{ CHUNK_ID_ICMS, 128 }, |
3261 |
File::File() : DLS::File() { |
File::File() : DLS::File() { |
3262 |
*pVersion = VERSION_3; |
*pVersion = VERSION_3; |
3263 |
pGroups = NULL; |
pGroups = NULL; |
3264 |
pInfo->FixedStringLengths = FixedStringLengths; |
pInfo->SetFixedStringLengths(_FileFixedStringLengths); |
3265 |
pInfo->ArchivalLocation = String(256, ' '); |
pInfo->ArchivalLocation = String(256, ' '); |
3266 |
|
|
3267 |
// add some mandatory chunks to get the file chunks in right |
// add some mandatory chunks to get the file chunks in right |
3275 |
|
|
3276 |
File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) { |
File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) { |
3277 |
pGroups = NULL; |
pGroups = NULL; |
3278 |
pInfo->FixedStringLengths = FixedStringLengths; |
pInfo->SetFixedStringLengths(_FileFixedStringLengths); |
3279 |
} |
} |
3280 |
|
|
3281 |
File::~File() { |
File::~File() { |