static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec) { AuElement elms[3]; int buffer_size; Uint16 test_format, format; this->hidden->mixbuf = NULL; /* Try for a closest match on audio format */ format = 0; for ( test_format = SDL_FirstAudioFormat(spec->format); ! format && test_format; ) { format = sdlformat_to_auformat(test_format); if (format == AuNone) { test_format = SDL_NextAudioFormat(); } } if ( format == 0 ) { SDL_SetError("Couldn't find any hardware audio formats"); return(-1); } spec->format = test_format; this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); if (this->hidden->aud == 0) { SDL_SetError("Couldn't open connection to NAS server"); return (-1); } this->hidden->dev = find_device(this, spec->channels); if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) { AuCloseServer(this->hidden->aud); this->hidden->aud = 0; SDL_SetError("Couldn't find a fitting playback device on NAS server"); return (-1); } buffer_size = spec->freq; if (buffer_size < 4096) buffer_size = 4096; if (buffer_size > 32768) buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ /* Calculate the final parameters for this audio specification */ SDL_CalculateAudioSpec(spec); this2 = this->hidden; AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue, buffer_size, buffer_size / 4, 0, NULL); AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq, AuUnlimitedSamples, 0, NULL); AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, event_handler, (AuPointer) NULL); AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); /* Allocate mixing buffer */ this->hidden->mixlen = spec->size; this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen); if ( this->hidden->mixbuf == NULL ) { return(-1); } memset(this->hidden->mixbuf, spec->silence, spec->size); /* Get the parent process id (we're the parent of the audio thread) */ this->hidden->parent = getpid(); /* We're ready to rock and roll. :-) */ return(0); }
static int NAS_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) { AuElement elms[3]; int buffer_size; SDL_AudioFormat test_format, format; /* Initialize all variables that we clean on shutdown */ this->hidden = (struct SDL_PrivateAudioData *) SDL_malloc((sizeof *this->hidden)); if (this->hidden == NULL) { return SDL_OutOfMemory(); } SDL_memset(this->hidden, 0, (sizeof *this->hidden)); /* Try for a closest match on audio format */ format = 0; for (test_format = SDL_FirstAudioFormat(this->spec.format); !format && test_format;) { format = sdlformat_to_auformat(test_format); if (format == AuNone) { test_format = SDL_NextAudioFormat(); } } if (format == 0) { NAS_CloseDevice(this); return SDL_SetError("NAS: Couldn't find any hardware audio formats"); } this->spec.format = test_format; this->hidden->aud = NAS_AuOpenServer("", 0, NULL, 0, NULL, NULL); if (this->hidden->aud == 0) { NAS_CloseDevice(this); return SDL_SetError("NAS: Couldn't open connection to NAS server"); } this->hidden->dev = find_device(this, this->spec.channels); if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = NAS_AuCreateFlow(this->hidden->aud, 0)))) { NAS_CloseDevice(this); return SDL_SetError("NAS: Couldn't find a fitting device on NAS server"); } buffer_size = this->spec.freq; if (buffer_size < 4096) buffer_size = 4096; if (buffer_size > 32768) buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ /* Calculate the final parameters for this audio specification */ SDL_CalculateAudioSpec(&this->spec); this2 = this->hidden; AuMakeElementImportClient(elms, this->spec.freq, format, this->spec.channels, AuTrue, buffer_size, buffer_size / 4, 0, NULL); AuMakeElementExportDevice(elms + 1, 0, this->hidden->dev, this->spec.freq, AuUnlimitedSamples, 0, NULL); NAS_AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); NAS_AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, event_handler, (AuPointer) NULL); NAS_AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); /* Allocate mixing buffer */ this->hidden->mixlen = this->spec.size; this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); if (this->hidden->mixbuf == NULL) { NAS_CloseDevice(this); return SDL_OutOfMemory(); } SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); /* We're ready to rock and roll. :-) */ return 0; }