Mercurial > sdl-ios-xcode
view src/audio/dart/SDL_dart.c @ 1276:ca3718c215af
Wacky! :)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 27 Jan 2006 07:02:19 +0000 |
parents | 173c063d4f55 |
children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* Allow access to a raw mixing buffer */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "SDL_types.h" #include "SDL_error.h" #include "SDL_timer.h" #include "SDL_audio.h" #include "SDL_audio_c.h" #include "SDL_dart.h" // Buffer states: #define BUFFER_EMPTY 0 #define BUFFER_USED 1 typedef struct _tMixBufferDesc { int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED SDL_AudioDevice *pSDLAudioDevice; } tMixBufferDesc, *pMixBufferDesc; //--------------------------------------------------------------------- // DARTEventFunc // // This function is called by DART, when an event occures, like end of // playback of a buffer, etc... //--------------------------------------------------------------------- LONG APIENTRY DARTEventFunc(ULONG ulStatus, PMCI_MIX_BUFFER pBuffer, ULONG ulFlags) { if (ulFlags && MIX_WRITE_COMPLETE) { // Playback of buffer completed! // Get pointer to buffer description pMixBufferDesc pBufDesc; if (pBuffer) { pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm; if (pBufDesc) { SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice; // Set the buffer to be empty pBufDesc->iBufferUsage = BUFFER_EMPTY; // And notify DART feeder thread that it will have to work a bit. if (pSDLAudioDevice) DosPostEventSem(pSDLAudioDevice->hidden->hevAudioBufferPlayed); } } } return TRUE; } int DART_OpenAudio(_THIS, SDL_AudioSpec *spec) { MCI_AMP_OPEN_PARMS AmpOpenParms; MCI_GENERIC_PARMS GenericParms; int iDeviceOrd = 0; // Default device to be used int bOpenShared = 1; // Try opening it shared int iBits = 16; // Default is 16 bits signed int iFreq = 44100; // Default is 44KHz int iChannels = 2; // Default is 2 channels (Stereo) int iNumBufs = 2; // Number of audio buffers: 2 int iBufSize; int iOpenMode; int iSilence; int rc; // First thing is to try to open a given DART device! memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS)); // pszDeviceType should contain the device type in low word, and device ordinal in high word! AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16)); iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID; if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE; rc = mciSendCommand( 0, MCI_OPEN, iOpenMode, (PVOID) &AmpOpenParms, 0); if (rc!=MCIERR_SUCCESS) // No audio available?? return (-1); // Save the device ID we got from DART! // We will use this in the next calls! iDeviceOrd = AmpOpenParms.usDeviceID; // Determine the audio parameters from the AudioSpec switch ( spec->format & 0xFF ) { case 8: /* Unsigned 8 bit audio data */ spec->format = AUDIO_U8; iSilence = 0x80; iBits = 8; break; case 16: /* Signed 16 bit audio data */ spec->format = AUDIO_S16; iSilence = 0x00; iBits = 16; break; default: // Close DART, and exit with error code! mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Unsupported audio format"); return(-1); } iFreq = spec->freq; iChannels = spec->channels; /* Update the fragment size as size in bytes */ SDL_CalculateAudioSpec(spec); iBufSize = spec->size; // Now query this device if it supports the given freq/bits/channels! memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS)); _this->hidden->MixSetupParms.ulBitsPerSample = iBits; _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM; _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq; _this->hidden->MixSetupParms.ulChannels = iChannels; _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY; _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO; _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc; rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP, MCI_WAIT | MCI_MIXSETUP_QUERYMODE, &(_this->hidden->MixSetupParms), 0); if (rc!=MCIERR_SUCCESS) { // The device cannot handle this format! // Close DART, and exit with error code! mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Audio device doesn't support requested audio format"); return(-1); } // The device can handle this format, so initialize! rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP, MCI_WAIT | MCI_MIXSETUP_INIT, &(_this->hidden->MixSetupParms), 0); if (rc!=MCIERR_SUCCESS) { // The device could not be opened! // Close DART, and exit with error code! mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Audio device could not be set up"); return(-1); } // Ok, the device is initialized. // Now we should allocate buffers. For this, we need a place where // the buffer descriptors will be: _this->hidden->pMixBuffers = (MCI_MIX_BUFFER *) malloc(sizeof(MCI_MIX_BUFFER)*iNumBufs); if (!(_this->hidden->pMixBuffers)) { // Not enough memory! // Close DART, and exit with error code! mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Not enough memory for audio buffer descriptors"); return(-1); } // Now that we have the place for buffer list, we can ask DART for the // buffers! _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list // Allocate buffers! rc = mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_ALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); if ((rc!=MCIERR_SUCCESS) || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers) || (_this->hidden->BufferParms.ulBufferSize==0)) { // Could not allocate memory! // Close DART, and exit with error code! free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("DART could not allocate buffers"); return(-1); } // Ok, we have all the buffers allocated, let's mark them! { int i; for (i=0; i<iNumBufs; i++) { pMixBufferDesc pBufferDesc = (pMixBufferDesc) malloc(sizeof(tMixBufferDesc));; // Check if this buffer was really allocated by DART if ((!(_this->hidden->pMixBuffers[i].pBuffer)) || (!pBufferDesc)) { // Wrong buffer! // Close DART, and exit with error code! // Free buffer descriptions { int j; for (j=0; j<i; j++) free((void *)(_this->hidden->pMixBuffers[j].ulUserParm)); } // and cleanup mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Error at internal buffer check"); return(-1); } pBufferDesc->iBufferUsage = BUFFER_EMPTY; pBufferDesc->pSDLAudioDevice = _this; _this->hidden->pMixBuffers[i].ulBufferLength = _this->hidden->BufferParms.ulBufferSize; _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of // audio data, but as we will continously send // audio data, there will be no end.:) memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence, iBufSize); } } _this->hidden->iNextFreeBuffer = 0; _this->hidden->iLastPlayedBuf = -1; // Create event semaphore if (DosCreateEventSem(NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE)!=NO_ERROR) { // Could not create event semaphore! { int i; for (i=0; i<iNumBufs; i++) free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); } mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); SDL_SetError("Could not create event semaphore"); return(-1); } // Store the new settings in global variables _this->hidden->iCurrDeviceOrd = iDeviceOrd; _this->hidden->iCurrFreq = iFreq; _this->hidden->iCurrBits = iBits; _this->hidden->iCurrChannels = iChannels; _this->hidden->iCurrNumBufs = iNumBufs; _this->hidden->iCurrBufSize = iBufSize; return (0); } void DART_ThreadInit(_THIS) { return; } /* This function waits until it is possible to write a full sound buffer */ void DART_WaitAudio(_THIS) { int i; pMixBufferDesc pBufDesc; ULONG ulPostCount; DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); // If there is already an empty buffer, then return now! for (i=0; i<_this->hidden->iCurrNumBufs; i++) { pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm; if (pBufDesc->iBufferUsage == BUFFER_EMPTY) return; } // If there is no empty buffer, wait for one to be empty! DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important! return; } void DART_PlayAudio(_THIS) { int iFreeBuf = _this->hidden->iNextFreeBuffer; pMixBufferDesc pBufDesc; pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; pBufDesc->iBufferUsage = BUFFER_USED; // Send it to DART to be queued _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.ulMixHandle, &(_this->hidden->pMixBuffers[iFreeBuf]), 1); _this->hidden->iLastPlayedBuf = iFreeBuf; iFreeBuf = (iFreeBuf+1) % _this->hidden->iCurrNumBufs; _this->hidden->iNextFreeBuffer = iFreeBuf; } Uint8 *DART_GetAudioBuf(_THIS) { int iFreeBuf; Uint8 *pResult; pMixBufferDesc pBufDesc; if (_this) { if (_this->hidden) { iFreeBuf = _this->hidden->iNextFreeBuffer; pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; if (pBufDesc) { if (pBufDesc->iBufferUsage == BUFFER_EMPTY) { pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer; return pResult; } } else printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n", pBufDesc); } else printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n", _this->hidden); } else printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this); return NULL; } void DART_WaitDone(_THIS) { pMixBufferDesc pBufDesc; ULONG ulPostCount; APIRET rc; pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm; rc = NO_ERROR; while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc==NO_ERROR)) { DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important! } } void DART_CloseAudio(_THIS) { MCI_GENERIC_PARMS GenericParms; int rc; // Stop DART playback rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT, &GenericParms, 0); if (rc!=MCIERR_SUCCESS) { #ifdef SFX_DEBUG_BUILD printf("Could not stop DART playback!\n"); fflush(stdout); #endif } // Close event semaphore DosCloseEventSem(_this->hidden->hevAudioBufferPlayed); // Free memory of buffer descriptions { int i; for (i=0; i<_this->hidden->iCurrNumBufs; i++) free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); } // Deallocate buffers rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); // Free bufferlist free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; // Close dart rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT, &(GenericParms), 0); } /* Audio driver bootstrap functions */ int Audio_Available(void) { return(1); } void Audio_DeleteDevice(SDL_AudioDevice *device) { free(device->hidden); free(device); } SDL_AudioDevice *Audio_CreateDevice(int devindex) { SDL_AudioDevice *this; /* Initialize all variables that we clean on shutdown */ this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); if ( this ) { memset(this, 0, (sizeof *this)); this->hidden = (struct SDL_PrivateAudioData *) malloc((sizeof *this->hidden)); } if ( (this == NULL) || (this->hidden == NULL) ) { SDL_OutOfMemory(); if ( this ) free(this); return(0); } memset(this->hidden, 0, (sizeof *this->hidden)); /* Set the function pointers */ this->OpenAudio = DART_OpenAudio; this->ThreadInit = DART_ThreadInit; this->WaitAudio = DART_WaitAudio; this->PlayAudio = DART_PlayAudio; this->GetAudioBuf = DART_GetAudioBuf; this->WaitDone = DART_WaitDone; this->CloseAudio = DART_CloseAudio; this->free = Audio_DeleteDevice; return this; } AudioBootStrap DART_bootstrap = { "dart", "OS/2 Direct Audio RouTines (DART)", Audio_Available, Audio_CreateDevice };