ref: a952619a3ea1d1924ca7e8605ce495f0d121a167
dir: /aacDECdrop/wave_out.c/
/* * function: Support for playing wave files - Win32 - ONLY * * This program is distributed under the GNU General Public License, version 2. * A copy of this license is included with this source. * * Copyright (C) 2002 John Edwards */ #include <string.h> #include <errno.h> #include "wave_out.h" #define MAX_WAVEBLOCKS 32 static CRITICAL_SECTION cs; static HWAVEOUT dev = NULL; static int ScheduledBlocks = 0; static int PlayedWaveHeadersCount = 0; // free index static WAVEHDR* PlayedWaveHeaders [MAX_WAVEBLOCKS]; static int Box ( const char* msg ) { MessageBox ( NULL, msg, "Error Message . . .", MB_OK | MB_ICONEXCLAMATION ); return -1; } /* * This function registers already played WAVE chunks. Freeing is done by free_memory(), */ static void CALLBACK wave_callback ( HWAVE hWave, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 ) { if ( uMsg == WOM_DONE ) { EnterCriticalSection ( &cs ); PlayedWaveHeaders [PlayedWaveHeadersCount++] = (WAVEHDR*) dwParam1; LeaveCriticalSection ( &cs ); } } static void free_memory ( void ) { WAVEHDR* wh; HGLOBAL hg; EnterCriticalSection ( &cs ); wh = PlayedWaveHeaders [--PlayedWaveHeadersCount]; ScheduledBlocks--; // decrease the number of USED blocks LeaveCriticalSection ( &cs ); waveOutUnprepareHeader ( dev, wh, sizeof (WAVEHDR) ); hg = GlobalHandle ( wh -> lpData ); // Deallocate the buffer memory GlobalUnlock (hg); GlobalFree (hg); hg = GlobalHandle ( wh ); // Deallocate the header memory GlobalUnlock (hg); GlobalFree (hg); } Int Set_WIN_Params ( FILE_T dummyFile , Ldouble SampleFreq, Uint BitsPerSample, Uint Channels ) { WAVEFORMATEX outFormat; UINT deviceID = WAVE_MAPPER; (void) dummyFile; if ( waveOutGetNumDevs () == 0 ) return Box ( "No audio device present." ); outFormat.wFormatTag = WAVE_FORMAT_PCM; outFormat.wBitsPerSample = BitsPerSample; outFormat.nChannels = Channels; outFormat.nSamplesPerSec = (unsigned long)(SampleFreq); outFormat.nBlockAlign = outFormat.nChannels * outFormat.wBitsPerSample/8; outFormat.nAvgBytesPerSec = outFormat.nSamplesPerSec * outFormat.nChannels * outFormat.wBitsPerSample/8; switch ( waveOutOpen ( &dev, deviceID, &outFormat, (DWORD)wave_callback, 0, CALLBACK_FUNCTION ) ) { case MMSYSERR_ALLOCATED: return Box ( "Device is already open." ); case MMSYSERR_BADDEVICEID: return Box ( "The specified device is out of range." ); case MMSYSERR_NODRIVER: return Box ( "There is no audio driver in this system." ); case MMSYSERR_NOMEM: return Box ( "Unable to allocate sound memory." ); case WAVERR_BADFORMAT: return Box ( "This audio format is not supported." ); case WAVERR_SYNC: return Box ( "The device is synchronous." ); default: return Box ( "Unknown media error." ); case MMSYSERR_NOERROR: break; } waveOutReset ( dev ); InitializeCriticalSection ( &cs ); SetPriorityClass ( GetCurrentProcess (), HIGH_PRIORITY_CLASS ); // SetPriorityClass ( GetCurrentProcess (), REALTIME_PRIORITY_CLASS ); return 0; } int WIN_Play_Samples ( const void* data, size_t len ) { HGLOBAL hg; HGLOBAL hg2; LPWAVEHDR wh; void* allocptr; do { while ( PlayedWaveHeadersCount > 0 ) // free used blocks ... free_memory (); if ( ScheduledBlocks < sizeof(PlayedWaveHeaders)/sizeof(*PlayedWaveHeaders) ) // wait for a free block ... break; Sleep (26); } while (1); if ( (hg2 = GlobalAlloc ( GMEM_MOVEABLE, len )) == NULL ) // allocate some memory for a copy of the buffer return Box ( "GlobalAlloc failed." ); allocptr = GlobalLock (hg2); CopyMemory ( allocptr, data, len ); // Here we can call any modification output functions we want.... if ( (hg = GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, sizeof (WAVEHDR))) == NULL ) // now make a header and WRITE IT! return -1; wh = GlobalLock (hg); wh->dwBufferLength = len; wh->lpData = allocptr; if ( waveOutPrepareHeader ( dev, wh, sizeof (WAVEHDR)) != MMSYSERR_NOERROR ) { GlobalUnlock (hg); GlobalFree (hg); return -1; } if ( waveOutWrite ( dev, wh, sizeof (WAVEHDR)) != MMSYSERR_NOERROR ) { GlobalUnlock (hg); GlobalFree (hg); return -1; } EnterCriticalSection ( &cs ); ScheduledBlocks++; LeaveCriticalSection ( &cs ); return len; } int WIN_Audio_close ( void ) { if ( dev != NULL ) { while ( ScheduledBlocks > 0 ) { Sleep (ScheduledBlocks); while ( PlayedWaveHeadersCount > 0 ) // free used blocks ... free_memory (); } waveOutReset (dev); // reset the device waveOutClose (dev); // close the device dev = NULL; } DeleteCriticalSection ( &cs ); ScheduledBlocks = 0; return 0; } /******************************** end of wave_out.c ********************************/