8000 SDL/src/audio/paudio/SDL_paudio.c at SDL2 · kyuur/SDL · GitHub
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SDL_paudio.c

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SDL_paudio.c

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*/
if (paud_bufinfo.request_buf_cap == 1) {
this->spec.samples = paud_bufinfo.write_buf_cap
/ bytes_per_sample / this->spec.channels;
} else {
this->spec.samples = paud_bufinfo.write_buf_cap
/ bytes_per_sample / this->spec.channels / 2;
}
paud_init.bsize = bytes_per_sample * this->spec.channels;
SDL_CalculateAudioSpec(&this->spec);
/*
* The AIX paud device init can't modify the values of the audio_init
* structure that we pass to it. So we don't need any recalculation
* of this stuff and no reinit call as in linux dsp code.
*
* /dev/paud supports all of the encoding formats, so we don't need
* to do anything like reopening the device, either.
*/
if (ioctl(fd, AUDIO_INIT, &paud_init) < 0) {
switch (paud_init.rc) {
case 1:
err = "DSP can't do play requests";
break;
case 2:
err = "DSP can't do record requests";
break;
case 4:
err = "request was invalid";
break;
case 5:
err = "conflict with open's flags";
break;
case 6:
err = "out of DSP MIPS or memory";
break;
default:
err = "not documented in sys/audio.h";
break;
}
return SDL_SetError("paud: Couldn't set audio format (%s)", err);
}
/* Allocate mixing buffer */
this->hidden->mixlen = this->spec.size;
this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
if (!this->hidden->mixbuf) {
return SDL_OutOfMemory();
}
SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
/*
* Set some paramters: full volume, first speaker that we can find.
* Ignore the other settings for now.
*/
paud_change.input = AUDIO_IGNORE; /* the new input source */
paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */
paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */
paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */
paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */
paud_change.balance = 0x3fffffff; /* the new balance */
paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */
paud_change.treble = AUDIO_IGNORE; /* the new treble state */
paud_change.bass = AUDIO_IGNORE; /* the new bass state */
paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */
paud_control.ioctl_request = AUDIO_CHANGE;
paud_control.request_info = (char *) &paud_change;
if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) {
#ifdef DEBUG_AUDIO
fprintf(stderr, "Can't change audio display settings\n");
#endif
}
/*
* Tell the device to expect data. Actual start will wait for
* the first write() call.
*/
paud_control.ioctl_request = AUDIO_START;
paud_control.position = 0;
if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) {
#ifdef DEBUG_AUDIO
fprintf(stderr, "Can't start audio play\n");
#endif
return SDL_SetError("Can't start audio play");
}
/* Check to see if we need to use SDL_IOReady() workaround */
if (workaround) {
this->hidden->frame_ticks = (float) (this->spec.samples * 1000) /
this->spec.freq;
this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
}
/* We're ready to rock and roll. :-) */
return 0;
}
static SDL_bool PAUDIO_Init(SDL_AudioDriverImpl * impl)
{
/* !!! FIXME: not right for device enum? */
int fd = OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
if (fd < 0) {
SDL_SetError("PAUDIO: Couldn't open audio device");
return SDL_FALSE;
}
close(fd);
/* Set the function pointers */
impl->OpenDevice = PAUDIO_OpenDevice;
impl->PlayDevice = PAUDIO_PlayDevice;
impl->WaitDevice = PAUDIO_WaitDevice;
impl->GetDeviceBuf = PAUDIO_GetDeviceBuf;
impl->CloseDevice = PAUDIO_CloseDevice;
impl-> /* !!! FIXME: add device enum! */
return SDL_TRUE; /* this audio target is available. */
}
AudioBootStrap PAUDIO_bootstrap = {
"paud", "AIX Paudio", PAUDIO_Init, SDL_FALSE
};
#endif /* SDL_AUDIO_DRIVER_PAUDIO */
/* vi: set ts=4 sw=4 expandtab: */
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