diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/dart/SDL_dart.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/dart/SDL_dart.c | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/dart/SDL_dart.c b/distrib/sdl-1.2.15/src/audio/dart/SDL_dart.c new file mode 100644 index 0000000..77e530d --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/dart/SDL_dart.c @@ -0,0 +1,441 @@ +/* + 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 +}; + |