wavefiles_src

/*********************************************************************** * wavelib.c * * Audio Library * * * Supports .WAV files, Very Simplistic Parser * * * Toby Opferman Copyright (c) 2003 * ***********************************************************************/ #include <windows.h> #include <mmsystem.h> #include <wavelib.h> /*********************************************************************** * Internal Structures ***********************************************************************/ typedef struct { UCHAR IdentifierString[4]; DWORD dwLength; } RIFF_CHUNK, *PRIFF_CHUNK; typedef struct { WORD wFormatTag; // Format category WORD wChannels; // Number of channels DWORD dwSamplesPerSec; // Sampling rate DWORD dwAvgBytesPerSec; // For buffer estimation WORD wBlockAlign; // Data block size WORD wBitsPerSample; } WAVE_FILE_HEADER, *PWAVE_FILE_HEADER; typedef struct _wave_sample { WAVEFORMATEX WaveFormatEx; char *pSampleData; UINT Index; UINT Size; DWORD dwId; DWORD bPlaying; struct _wave_sample *pNext; } WAVE_SAMPLE, *PWAVE_SAMPLE; #define SAMPLE_SIZE (2*2*2000) typedef struct { HWAVEOUT hWaveOut; HANDLE hEvent; HANDLE hThread; WAVE_SAMPLE WaveSample; BOOL bWaveShouldDie; WAVEHDR WaveHdr[8]; char AudioBuffer[8][SAMPLE_SIZE]; BOOL bPaused; } WAVELIB, *PWAVELIB; /*********************************************************************** * Internal Functions ***********************************************************************/ void CALLBACK WaveLib_WaveOutputCallback(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2); BOOL WaveLib_OpenWaveSample(CHAR *pFileName, PWAVE_SAMPLE pWaveSample); void WaveLib_WaveOpen(HWAVEOUT hWaveOut, PWAVELIB pWaveLib); void WaveLib_WaveDone(HWAVEOUT hWaveOut, PWAVELIB pWaveLib); DWORD WINAPI WaveLib_AudioThread(PVOID pDataInput); void WaveLib_CreateThread(PWAVELIB pWaveLib); void WaveLib_SetupAudio(PWAVELIB pWaveLib); void WaveLib_WaveClose(HWAVEOUT hWaveOut, PWAVELIB pWaveLib); void WaveLib_AudioBuffer(PWAVELIB pWaveLib, UINT Index); /*********************************************************************** * WaveLib_Init * * Audio! * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ HWAVELIB WaveLib_Init(PCHAR pWaveFile, BOOL bPause) { PWAVELIB pWaveLib = NULL; if(pWaveLib = (PWAVELIB)LocalAlloc(LMEM_ZEROINIT, sizeof(WAVELIB))) { pWaveLib->bPaused = bPause; if(WaveLib_OpenWaveSample(pWaveFile, &pWaveLib->WaveSample)) { if(waveOutOpen(&pWaveLib->hWaveOut, WAVE_MAPPER, &pWaveLib->WaveSample.WaveFormatEx, (ULONG)WaveLib_WaveOutputCallback, (ULONG)pWaveLib, CALLBACK_FUNCTION) != MMSYSERR_NOERROR) { WaveLib_UnInit((HWAVELIB)pWaveLib); pWaveLib = NULL; } else { if(pWaveLib->bPaused) { waveOutPause(pWaveLib->hWaveOut); } WaveLib_CreateThread(pWaveLib); } } else { WaveLib_UnInit((HWAVELIB)pWaveLib); pWaveLib = NULL; } } return (HWAVELIB)pWaveLib; } /*********************************************************************** * WaveLib_Pause * * Audio! * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void WaveLib_Pause(HWAVELIB hWaveLib, BOOL bPause) { PWAVELIB pWaveLib = (PWAVELIB)hWaveLib; pWaveLib->bPaused = bPause; if(pWaveLib->bPaused) { waveOutPause(pWaveLib->hWaveOut); } else { waveOutRestart(pWaveLib->hWaveOut); } } /*********************************************************************** * WaveLib_Init * * Audio! * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void WaveLib_UnInit(HWAVELIB hWaveLib) { PWAVELIB pWaveLib = (PWAVELIB)hWaveLib; if(pWaveLib) { if(pWaveLib->hThread) { pWaveLib->bWaveShouldDie = TRUE; SetEvent(pWaveLib->hEvent); WaitForSingleObject(pWaveLib->hThread, INFINITE); CloseHandle(pWaveLib->hEvent); CloseHandle(pWaveLib->hThread); } if(pWaveLib->hWaveOut) { waveOutClose(pWaveLib->hWaveOut); } if(pWaveLib->WaveSample.pSampleData) { LocalFree(pWaveLib->WaveSample.pSampleData); } LocalFree(pWaveLib); } } /*********************************************************************** * WaveLib_WaveOutputCallback * * Audio Callback * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void CALLBACK WaveLib_WaveOutputCallback(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2) { PWAVELIB pWaveLib = (PWAVELIB)dwInstance; switch(uMsg) { case WOM_OPEN: WaveLib_WaveOpen(hwo, pWaveLib); break; case WOM_DONE: WaveLib_WaveDone(hwo, pWaveLib); break; case WOM_CLOSE: WaveLib_WaveClose(hwo, pWaveLib); break; } } /*********************************************************************** * WaveLib_WaveOpen * * Audio Callback * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void WaveLib_WaveOpen(HWAVEOUT hWaveOut, PWAVELIB pWaveLib) { // Do Nothing } /*********************************************************************** * WaveLib_WaveDone * * Audio Callback * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void WaveLib_WaveDone(HWAVEOUT hWaveOut, PWAVELIB pWaveLib) { SetEvent(pWaveLib->hEvent); } /*********************************************************************** * WaveLib_WaveClose * * Audio Callback * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ void WaveLib_WaveClose(HWAVEOUT hWaveOut, PWAVELIB pWaveLib) { // Do Nothing } /*********************************************************************** * WaveLib_OpenWaveFile * * Audio Callback * * Parameters * * * Return Value * Handle To This Audio Session * ***********************************************************************/ BOOL WaveLib_OpenWaveSample(CHAR *pFileName, PWAVE_SAMPLE pWaveSample) { BOOL bSampleLoaded = FALSE; HANDLE hFile; RIFF_CHUNK RiffChunk = {0}; DWORD dwBytes, dwReturnValue; WAVE_FILE_HEADER WaveFileHeader; DWORD dwIncrementBytes; if(hFile = CreateFile(pFileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) { char szIdentifier[5] = {0}; SetFilePointer(hFile, 12, NULL