| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2004 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 |
| */ |
| #include "SDL_config.h" |
| |
| /* Tru64 UNIX MME support */ |
| #include <mme_api.h> |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audio_c.h" |
| #include "SDL_mmeaudio.h" |
| |
| static BOOL inUse[NUM_BUFFERS]; |
| |
| static void |
| SetMMerror(char *function, MMRESULT code) |
| { |
| int len; |
| char errbuf[MAXERRORLENGTH]; |
| |
| SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
| len = SDL_strlen(errbuf); |
| waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len); |
| SDL_SetError("%s", errbuf); |
| } |
| |
| static void CALLBACK |
| MME_Callback(HWAVEOUT hwo, |
| UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2) |
| { |
| WAVEHDR *wp = (WAVEHDR *) dwParam1; |
| |
| if (uMsg == WOM_DONE) |
| inUse[wp->dwUser] = FALSE; |
| } |
| |
| static int |
| MME_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| int valid_format = 0; |
| MMRESULT result; |
| Uint8 *mixbuf = NULL; |
| int i; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| if (this->hidden == NULL) { |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| /* Set basic WAVE format parameters */ |
| this->hidden->shm = mmeAllocMem(sizeof(*this->hidden->shm)); |
| if (this->hidden->shm == NULL) { |
| MME_CloseDevice(this); |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| |
| SDL_memset(this->hidden->shm, '\0', sizeof (*this->hidden->shm)); |
| this->hidden->shm->sound = 0; |
| this->hidden->shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; |
| |
| /* Determine the audio parameters from the AudioSpec */ |
| /* Try for a closest match on audio format */ |
| for (test_format = SDL_FirstAudioFormat(this->spec.format); |
| !valid_format && test_format;) { |
| valid_format = 1; |
| switch (test_format) { |
| case AUDIO_U8: |
| case AUDIO_S16: |
| case AUDIO_S32: |
| break; |
| default: |
| valid_format = 0; |
| test_format = SDL_NextAudioFormat(); |
| } |
| } |
| |
| if (!valid_format) { |
| MME_CloseDevice(this); |
| SDL_SetError("Unsupported audio format"); |
| return 0; |
| } |
| |
| this->spec.format = test_format; |
| this->hidden->shm->wFmt.wBitsPerSample = SDL_AUDIO_BITSIZE(test_format); |
| |
| /* !!! FIXME: Can this handle more than stereo? */ |
| this->hidden->shm->wFmt.wf.nChannels = this->spec.channels; |
| this->hidden->shm->wFmt.wf.nSamplesPerSec = this->spec.freq; |
| this->hidden->shm->wFmt.wf.nBlockAlign = |
| this->hidden->shm->wFmt.wf.nChannels * |
| this->hidden->shm->wFmt.wBitsPerSample / 8; |
| this->hidden->shm->wFmt.wf.nAvgBytesPerSec = |
| this->hidden->shm->wFmt.wf.nSamplesPerSec * |
| this->hidden->shm->wFmt.wf.nBlockAlign; |
| |
| /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
| if (this->spec.samples < (this->spec.freq / 4)) |
| this->spec.samples = ((this->spec.freq / 4) + 3) & ~3; |
| |
| /* Update the fragment size as size in bytes */ |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* Open the audio device */ |
| result = waveOutOpen(&(this->hidden->shm->sound), |
| WAVE_MAPPER, |
| &(this->hidden->shm->wFmt.wf), |
| MME_Callback, |
| NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE)); |
| if (result != MMSYSERR_NOERROR) { |
| MME_CloseDevice(this); |
| SetMMerror("waveOutOpen()", result); |
| return 0; |
| } |
| |
| /* Create the sound buffers */ |
| mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (this->spec.size)); |
| if (mixbuf == NULL) { |
| MME_CloseDevice(this); |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| this->hidden->mixbuf = mixbuf; |
| |
| for (i = 0; i < NUM_BUFFERS; i++) { |
| this->hidden->shm->wHdr[i].lpData = &mixbuf[i * (this->spec.size)]; |
| this->hidden->shm->wHdr[i].dwBufferLength = this->spec.size; |
| this->hidden->shm->wHdr[i].dwFlags = 0; |
| this->hidden->shm->wHdr[i].dwUser = i; |
| this->hidden->shm->wHdr[i].dwLoops = 0; /* loop control counter */ |
| this->hidden->shm->wHdr[i].lpNext = NULL; /* reserved for driver */ |
| this->hidden->shm->wHdr[i].reserved = 0; |
| inUse[i] = FALSE; |
| } |
| this->hidden->next_buffer = 0; |
| |
| return 1; |
| } |
| |
| static void |
| MME_WaitDevice(_THIS) |
| { |
| while (inUse[this->hidden->next_buffer]) { |
| mmeWaitForCallbacks(); |
| mmeProcessCallbacks(); |
| } |
| } |
| |
| static Uint8 * |
| MME_GetDeviceBuf(_THIS) |
| { |
| void *retval = this->hidden->shm->wHdr[this->hidden->next_buffer].lpData; |
| inUse[this->hidden->next_buffer] = TRUE; |
| return (Uint8 *) retval; |
| } |
| |
| static void |
| MME_PlayDevice(_THIS) |
| { |
| /* Queue it up */ |
| waveOutWrite(this->hidden->shm->sound, |
| &(this->hidden->shm->wHdr[this->hidden->next_buffer]), |
| sizeof (WAVEHDR)); |
| this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS; |
| } |
| |
| static void |
| MME_WaitDone(_THIS) |
| { |
| MMRESULT result; |
| int i; |
| |
| if (this->hidden->shm->sound) { |
| for (i = 0; i < NUM_BUFFERS; i++) |
| while (inUse[i]) { |
| mmeWaitForCallbacks(); |
| mmeProcessCallbacks(); |
| } |
| result = waveOutReset(this->hidden->shm->sound); |
| if (result != MMSYSERR_NOERROR) |
| SetMMerror("waveOutReset()", result); |
| mmeProcessCallbacks(); |
| } |
| } |
| |
| static void |
| MME_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| MMRESULT result; |
| |
| if (this->hidden->mixbuf) { |
| result = mmeFreeBuffer(this->hidden->mixbuf); |
| if (result != MMSYSERR_NOERROR) |
| SetMMerror("mmeFreeBuffer", result); |
| this->hidden->mixbuf = NULL; |
| } |
| |
| if (this->hidden->shm) { |
| if (this->hidden->shm->sound) { |
| result = waveOutClose(this->hidden->shm->sound); |
| if (result != MMSYSERR_NOERROR) |
| SetMMerror("waveOutClose()", result); |
| mmeProcessCallbacks(); |
| } |
| result = mmeFreeMem(this->hidden->shm); |
| if (result != MMSYSERR_NOERROR) |
| SetMMerror("mmeFreeMem()", result); |
| this->hidden->shm = NULL; |
| } |
| |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| } |
| } |
| |
| static int |
| MME_Init(SDL_AudioDriverImpl *impl) |
| { |
| /* Set the function pointers */ |
| impl->OpenDevice = MME_OpenDevice; |
| impl->WaitDevice = MME_WaitDevice; |
| impl->WaitDone = MME_WaitDone; |
| impl->PlayDevice = MME_PlayDevice; |
| impl->GetDeviceBuf = MME_GetDeviceBuf; |
| impl->CloseDevice = MME_CloseDevice; |
| impl->OnlyHasDefaultOutputDevice = 1; |
| |
| return 1; |
| } |
| |
| /* !!! FIXME: Windows "windib" driver is called waveout, too */ |
| AudioBootStrap MMEAUDIO_bootstrap = { |
| "waveout", "Tru64 MME WaveOut", MME_Init, 0 |
| }; |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
