diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/mme/SDL_mmeaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/mme/SDL_mmeaudio.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/mme/SDL_mmeaudio.c b/distrib/sdl-1.2.15/src/audio/mme/SDL_mmeaudio.c new file mode 100644 index 0000000..64a0ecc --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/mme/SDL_mmeaudio.c @@ -0,0 +1,264 @@ +/* + 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 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]; + +/* Audio driver functions */ +static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec); +static void MME_WaitAudio(_THIS); +static Uint8 *MME_GetAudioBuf(_THIS); +static void MME_PlayAudio(_THIS); +static void MME_WaitDone(_THIS); +static void MME_CloseAudio(_THIS); + +/* Audio driver bootstrap functions */ +static int Audio_Available(void) +{ + return(1); +} + +static void Audio_DeleteDevice(SDL_AudioDevice *device) +{ + if ( device ) { + if ( device->hidden ) { + SDL_free(device->hidden); + device->hidden = NULL; + } + SDL_free(device); + device = NULL; + } +} + +static SDL_AudioDevice *Audio_CreateDevice(int devindex) +{ + SDL_AudioDevice *this; + +/* Initialize all variables that we clean on shutdown */ + this = SDL_malloc(sizeof(SDL_AudioDevice)); + if ( this ) { + SDL_memset(this, 0, (sizeof *this)); + this->hidden = 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 = MME_OpenAudio; + this->WaitAudio = MME_WaitAudio; + this->PlayAudio = MME_PlayAudio; + this->GetAudioBuf = MME_GetAudioBuf; + this->WaitDone = MME_WaitDone; + this->CloseAudio = MME_CloseAudio; + this->free = Audio_DeleteDevice; + + return this; +} + +AudioBootStrap MMEAUDIO_bootstrap = { + "waveout", "Tru64 MME WaveOut", + Audio_Available, Audio_CreateDevice +}; + +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_OpenAudio(_THIS, SDL_AudioSpec *spec) +{ + MMRESULT result; + int i; + + mixbuf = NULL; + + /* Set basic WAVE format parameters */ + shm = mmeAllocMem(sizeof(*shm)); + if ( shm == NULL ) { + SDL_SetError("Out of memory: shm"); + return(-1); + } + shm->sound = 0; + shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; + + /* Determine the audio parameters from the AudioSpec */ + switch ( spec->format & 0xFF ) { + case 8: + /* Unsigned 8 bit audio data */ + spec->format = AUDIO_U8; + shm->wFmt.wBitsPerSample = 8; + break; + case 16: + /* Signed 16 bit audio data */ + spec->format = AUDIO_S16; + shm->wFmt.wBitsPerSample = 16; + break; + default: + SDL_SetError("Unsupported audio format"); + return(-1); + } + + shm->wFmt.wf.nChannels = spec->channels; + shm->wFmt.wf.nSamplesPerSec = spec->freq; + shm->wFmt.wf.nBlockAlign = + shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8; + shm->wFmt.wf.nAvgBytesPerSec = + shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign; + + /* Check the buffer size -- minimum of 1/4 second (word aligned) */ + if ( spec->samples < (spec->freq/4) ) + spec->samples = ((spec->freq/4)+3)&~3; + + /* Update the fragment size as size in bytes */ + SDL_CalculateAudioSpec(spec); + + /* Open the audio device */ + result = waveOutOpen(&(shm->sound), + WAVE_MAPPER, + &(shm->wFmt.wf), + MME_CALLBACK, + NULL, + (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE)); + if ( result != MMSYSERR_NOERROR ) { + SetMMerror("waveOutOpen()", result); + return(-1); + } + + /* Create the sound buffers */ + mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size)); + if ( mixbuf == NULL ) { + SDL_SetError("Out of memory: mixbuf"); + return(-1); + } + + for (i = 0; i < NUM_BUFFERS; i++) { + shm->wHdr[i].lpData = &mixbuf[i * (spec->size)]; + shm->wHdr[i].dwBufferLength = spec->size; + shm->wHdr[i].dwFlags = 0; + shm->wHdr[i].dwUser = i; + shm->wHdr[i].dwLoops = 0; /* loop control counter */ + shm->wHdr[i].lpNext = NULL; /* reserved for driver */ + shm->wHdr[i].reserved = 0; + inUse[i] = FALSE; + } + next_buffer = 0; + return 0; +} + +static void MME_WaitAudio(_THIS) +{ + while ( inUse[next_buffer] ) { + mmeWaitForCallbacks(); + mmeProcessCallbacks(); + } +} + +static Uint8 *MME_GetAudioBuf(_THIS) +{ + Uint8 *retval; + + inUse[next_buffer] = TRUE; + retval = (Uint8 *)(shm->wHdr[next_buffer].lpData); + return retval; +} + +static void MME_PlayAudio(_THIS) +{ + /* Queue it up */ + waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR)); + next_buffer = (next_buffer+1)%NUM_BUFFERS; +} + +static void MME_WaitDone(_THIS) +{ + MMRESULT result; + int i; + + if ( shm->sound ) { + for (i = 0; i < NUM_BUFFERS; i++) + while ( inUse[i] ) { + mmeWaitForCallbacks(); + mmeProcessCallbacks(); + } + result = waveOutReset(shm->sound); + if ( result != MMSYSERR_NOERROR ) + SetMMerror("waveOutReset()", result); + mmeProcessCallbacks(); + } +} + +static void MME_CloseAudio(_THIS) +{ + MMRESULT result; + + if ( mixbuf ) { + result = mmeFreeBuffer(mixbuf); + if (result != MMSYSERR_NOERROR ) + SetMMerror("mmeFreeBuffer", result); + mixbuf = NULL; + } + + if ( shm ) { + if ( shm->sound ) { + result = waveOutClose(shm->sound); + if (result != MMSYSERR_NOERROR ) + SetMMerror("waveOutClose()", result); + mmeProcessCallbacks(); + } + result = mmeFreeMem(shm); + if (result != MMSYSERR_NOERROR ) + SetMMerror("mmeFreeMem()", result); + shm = NULL; + } +} + |