/* Copyright (c) 2002-2012 Croteam Ltd. This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "Engine/StdH.h" #include #include #include /* ==================================================== * * CONVERSION FUNCTIONS * */ // check wave format void PCMWaveInput::CheckWaveFormat_t(WAVEFORMATEX wfeCheck, char *pcErrorString) { // check format tag if (wfeCheck.wFormatTag != 1) { ThrowF_t(TRANS("%s: Invalid format tag, not a PCM Wave file!"), pcErrorString); } // check bits per sample if (wfeCheck.wBitsPerSample != 8 && wfeCheck.wBitsPerSample != 16) { ThrowF_t(TRANS("%s: Unknown Bits Per Sample value!"), pcErrorString); } // check number of channels if (wfeCheck.nChannels != 1 && wfeCheck.nChannels != 2) { ThrowF_t(TRANS("%s: Invalid number of channels!"), pcErrorString); } //ASSERT( wfeCheck.wBitsPerSample==16); } // Get next data inline ULONG PCMWaveInput::GetData_t(CTStream *pCstrInput) { ASSERT(pwi_bInfoLoaded); // read data according to bits per sample value if (pwi_wfeWave.wBitsPerSample==8) { // read UBYTE UBYTE ubData; *pCstrInput >> ubData; return ((ULONG)ubData) <<16; // (shift) prepare data for shrink/expand operation } else { // read UWORD SWORD swData; *pCstrInput >> swData; return ((ULONG)(swData+0x8000)) <<8; // (shift) prepare data for shrink/expand operation } } // Store data inline void PCMWaveInput::StoreData(ULONG ulData) { ASSERT( pwi_wfeDesired.wBitsPerSample==16); *pwi_pswMemory++ = ((SWORD)(ulData>>8) -0x8000); // (shift) restore data format } /* * Copy data */ void PCMWaveInput::CopyData_t(CTStream *pCstrInput) { // for all input data (mono and stereo) ULONG ulDataCount = GetDataLength() * pwi_wfeWave.nChannels; while (ulDataCount > 0) { StoreData(GetData_t(pCstrInput)); // read and store data from input (hidden BitsPerSample conversion!) ulDataCount--; // to next data } } /* * Shrink data */ // Shrink data void PCMWaveInput::ShrinkData_t(CTStream *pCstrInput) { ASSERT(pwi_dRatio>1.0); // *** MONO *** if (pwi_wfeWave.nChannels == 1) { DOUBLE dInterData, dTempData, dRatio; ULONG ulDataCount; // data intermediate value dInterData = 0.0; // for all input data (mono) ulDataCount = GetDataLength(); dRatio = pwi_dRatio; while (ulDataCount > 0) { // read part of data (<100%) if (dRatio<1.0) { dTempData = GetData_t(pCstrInput); dInterData += dTempData*dRatio; StoreData(ULONG(dInterData/pwi_dRatio)); // new intermediate value dRatio = 1 - dRatio; dInterData = dTempData*dRatio; dRatio = pwi_dRatio - dRatio; // read complete data (100%) } else { dInterData += GetData_t(pCstrInput); dRatio -= 1.0; } ulDataCount--; // to next data } StoreData(ULONG(dInterData/(pwi_dRatio-dRatio))); // *** STEREO *** } else if (pwi_wfeWave.nChannels == 2) { DOUBLE dLInterData, dRInterData, dLTempData, dRTempData, dRatio; ULONG ulDataCount; // data intermediate value dLInterData = 0.0; dRInterData = 0.0; // for all input data (mono) ulDataCount = GetDataLength(); dRatio = pwi_dRatio; while (ulDataCount > 0) { // read part of data (<100%) if (dRatio<1.0) { dLTempData = GetData_t(pCstrInput); dRTempData = GetData_t(pCstrInput); dLInterData += dLTempData*dRatio; dRInterData += dRTempData*dRatio; StoreData(ULONG(dLInterData/pwi_dRatio)); StoreData(ULONG(dRInterData/pwi_dRatio)); // new intermediate value dRatio = 1 - dRatio; dLInterData = dLTempData*dRatio; dRInterData = dRTempData*dRatio; dRatio = pwi_dRatio - dRatio; // read complete data (100%) } else { dLInterData += GetData_t(pCstrInput); dRInterData += GetData_t(pCstrInput); dRatio -= 1.0; } ulDataCount--; // to next data } StoreData(ULONG(dLInterData/(pwi_dRatio-dRatio))); StoreData(ULONG(dRInterData/(pwi_dRatio-dRatio))); } } /* ==================================================== * * WAVE FUNCTIONS * */ /* * Load Wave info */ WAVEFORMATEX PCMWaveInput::LoadInfo_t(CTStream *pCstrInput) { // if already loaded -> exception if (pwi_bInfoLoaded) { throw (TRANS("PCM Wave Input: Info already loaded.")); } /* Read Riff */ pCstrInput->ExpectID_t(CChunkID("RIFF")); // ID "RIFF" (*pCstrInput) >> pwi_ulRiffLength; // Ucitaj duljinu file-a /* Read Wave */ pCstrInput->ExpectID_t(CChunkID("WAVE")); // ID "WAVE" pCstrInput->ExpectID_t(CChunkID("fmt ")); // ID "fmt " // read Format Chunk length SLONG slFmtLength; (*pCstrInput) >> slFmtLength; // read WAVE format (*pCstrInput) >> pwi_wfeWave.wFormatTag; (*pCstrInput) >> pwi_wfeWave.nChannels; (*pCstrInput) >> pwi_wfeWave.nSamplesPerSec; (*pCstrInput) >> pwi_wfeWave.nAvgBytesPerSec; (*pCstrInput) >> pwi_wfeWave.nBlockAlign; (*pCstrInput) >> pwi_wfeWave.wBitsPerSample; pwi_wfeWave.cbSize = 0; // Only for PCM Wave !!! // WARNING !!! - Only for PCM Wave - Skip extra information if exists if( slFmtLength > 16) { //WarningMessage("PCM Wave Input: Wave format Extra information skipped!"); pCstrInput->Seek_t(slFmtLength - 16, CTStream::SD_CUR); } // WARNING - If exist Fact chunk skip it (purpose unknown) if( pCstrInput->GetID_t() == CChunkID("fact")) { //WarningMessage("PCM Wave Input: Fact Chunk skipped!"); SLONG slSkipLength; (*pCstrInput) >> slSkipLength; pCstrInput->Seek_t(slSkipLength, CTStream::SD_CUR); // seek back on Chunk ID } else { pCstrInput->Seek_t(-CID_LENGTH, CTStream::SD_CUR); } /* Read Data */ pCstrInput->ExpectID_t(CChunkID("data")); // ID "data" // read Data length (in bytes) (*pCstrInput) >> pwi_ulDataLength; /* Check PCM format */ CheckWaveFormat_t(pwi_wfeWave, "PCM Wave Input (input)"); // mark Info loaded pwi_bInfoLoaded = TRUE; // ASSERT( pwi_wfeWave.wBitsPerSample==16); // return Wave Format return pwi_wfeWave; } /* * Load and convert Wave data */ void PCMWaveInput::LoadData_t(CTStream *pCstrInput, SWORD *pswMemory, WAVEFORMATEX &SwfeDesired) { // if info not loaded -> exception if (!pwi_bInfoLoaded) { throw (TRANS("PCM Wave Input: Info not loaded.")); } // if already loaded -> exception if (pwi_bDataLoaded) { throw (TRANS("PCM Wave Input: Data already loaded")); } // set memory pointer pwi_pswMemory = pswMemory; // store and check desired sound format CheckWaveFormat_t(SwfeDesired, "PCM Wave Input (desired)"); pwi_wfeDesired = SwfeDesired; // calculate expand/shrink ratio (number of channels remain the same) pwi_dRatio = (DOUBLE)pwi_wfeDesired.nSamplesPerSec / (DOUBLE)pwi_wfeWave.nSamplesPerSec; // determine converion type from input and desired sound frequency, and convert sound if (pwi_dRatio < 1) { pwi_dRatio = 1/pwi_dRatio; ShrinkData_t(pCstrInput); } else if (pwi_dRatio > 1) { ASSERTALWAYS("Can't expand wave data"); memset(pwi_pswMemory, 0, DetermineBufferSize(pwi_wfeDesired)); // copy data } else { ASSERT(pwi_dRatio==1.0f); CopyData_t(pCstrInput); } // data is loaded (and maybe converted from 16-bits) if( pwi_wfeWave.wBitsPerSample==8) SwfeDesired.nBlockAlign *= 2; pwi_bDataLoaded = TRUE; } /* * Length in bytes */ ULONG PCMWaveInput::GetByteLength(void) { ASSERT(pwi_bInfoLoaded); return pwi_ulDataLength; } /* * Length in blocks */ ULONG PCMWaveInput::GetDataLength(void) { ASSERT(pwi_bInfoLoaded); return GetByteLength() / (pwi_wfeWave.nChannels * pwi_wfeWave.wBitsPerSample/8); } ULONG PCMWaveInput::GetDataLength(WAVEFORMATEX SwfeDesired) { ASSERT(pwi_bInfoLoaded); // return buffer size return DetermineBufferSize(SwfeDesired) / (SwfeDesired.nChannels * SwfeDesired.wBitsPerSample/8); } /* * Length in seconds */ DOUBLE PCMWaveInput::GetSecondsLength(void) { ASSERT(pwi_bInfoLoaded); return (DOUBLE)GetDataLength() / (DOUBLE)pwi_wfeWave.nSamplesPerSec; } /* * Buffer length in bytes */ ULONG PCMWaveInput::DetermineBufferSize(void) { return DetermineBufferSize(pwi_wfeWave); } ULONG PCMWaveInput::DetermineBufferSize( WAVEFORMATEX SwfeDesired) { ASSERT(pwi_bInfoLoaded); DOUBLE dRatio; // calculate ratio between formats dRatio = (DOUBLE)SwfeDesired.nSamplesPerSec / (DOUBLE)pwi_wfeWave.nSamplesPerSec * (DOUBLE)SwfeDesired.wBitsPerSample / (DOUBLE)pwi_wfeWave.wBitsPerSample; // return buffer size (must calculate with data length to avoid miss align data, for example: // 16 bit sound with 2 channels must be aligned to 4 bytes boundary and a multiply with // random ratio can as result give any possible number DOUBLE ret = ceil(dRatio*GetDataLength()) * (pwi_wfeWave.nChannels*(pwi_wfeWave.wBitsPerSample/8)); return (ULONG)ret; }