| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| /* Allow access to a raw mixing buffer */ |
| |
| #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) |
| { |
| Uint16 test_format = SDL_FirstAudioFormat(spec->format); |
| int valid_datatype = 0; |
| 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! |
| SDL_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 |
| if (spec->channels > 2) |
| spec->channels = 2; // !!! FIXME: more than stereo support in OS/2? |
| |
| while ((!valid_datatype) && (test_format)) { |
| spec->format = test_format; |
| valid_datatype = 1; |
| switch (test_format) { |
| case AUDIO_U8: |
| // Unsigned 8 bit audio data |
| iSilence = 0x80; |
| iBits = 8; |
| break; |
| |
| case AUDIO_S16LSB: |
| // Signed 16 bit audio data |
| iSilence = 0x00; |
| iBits = 16; |
| break; |
| |
| default: |
| valid_datatype = 0; |
| test_format = SDL_NextAudioFormat(); |
| break; |
| } |
| } |
| |
| if (!valid_datatype) { // shouldn't happen, but just in case... |
| // 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! |
| SDL_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 *) SDL_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! |
| SDL_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) SDL_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++) SDL_free((void *)(_this->hidden->pMixBuffers[j].ulUserParm)); |
| } |
| // and cleanup |
| mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); |
| SDL_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.:) |
| SDL_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++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); |
| } |
| mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); |
| SDL_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++) SDL_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 |
| SDL_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) |
| { |
| SDL_free(device->hidden); |
| SDL_free(device); |
| } |
| |
| SDL_AudioDevice *Audio_CreateDevice(int devindex) |
| { |
| SDL_AudioDevice *this; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| if ( this ) |
| { |
| SDL_memset(this, 0, (sizeof *this)); |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| } |
| if ( (this == NULL) || (this->hidden == NULL) ) |
| { |
| SDL_OutOfMemory(); |
| if ( this ) |
| SDL_free(this); |
| return(0); |
| } |
| SDL_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 |
| }; |
| |