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SDL_beaudio.cc
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Allow access to the audio stream on BeOS */
#include <SoundPlayer.h>
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#include "../../main/beos/SDL_BeApp.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
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#include "../../thread/beos/SDL_systhread_c.h"
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#include "SDL_beaudio.h"
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/* !!! FIXME: have the callback call the higher level to avoid code dupe. */
/* The BeOS callback for handling the audio buffer */
static void
FillSound(void *device, void *stream, size_t len,
const media_raw_audio_format & format)
{
SDL_AudioDevice *audio = (SDL_AudioDevice *) device;
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/* Silence the buffer, since it's ours */
SDL_memset(stream, audio->spec.silence, len);
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/* Only do soemthing if audio is enabled */
if (!audio->enabled)
return;
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if (!audio->paused) {
if (audio->convert.needed) {
SDL_mutexP(audio->mixer_lock);
(*audio->spec.callback) (audio->spec.userdata,
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(Uint8 *) audio->convert.buf,
audio->convert.len);
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SDL_mutexV(audio->mixer_lock);
SDL_ConvertAudio(&audio->convert);
SDL_memcpy(stream, audio->convert.buf, audio->convert.len_cvt);
} else {
SDL_mutexP(audio->mixer_lock);
(*audio->spec.callback) (audio->spec.userdata,
(Uint8 *) stream, len);
SDL_mutexV(audio->mixer_lock);
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BEOSAUDIO_CloseDevice(_THIS)
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{
if (_this->hidden != NULL) {
if (_this->hidden->audio_obj) {
_this->hidden->audio_obj->Stop();
delete _this->hidden->audio_obj;
_this->hidden->audio_obj = NULL;
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delete _this->hidden;
_this->hidden = NULL;
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}
static int
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BEOSAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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{
int valid_datatype = 0;
media_raw_audio_format format;
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SDL_AudioFormat test_format = SDL_FirstAudioFormat(_this->spec.format);
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/* Initialize all variables that we clean on shutdown */
_this->hidden = new SDL_PrivateAudioData;
if (_this->hidden == NULL) {
SDL_OutOfMemory();
return 0;
}
SDL_memset(_this->hidden, 0, (sizeof *_this->hidden));
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/* Parse the audio format and fill the Be raw audio format */
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SDL_memset(&format, '\0', sizeof(media_raw_audio_format));
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format.byte_order = B_MEDIA_LITTLE_ENDIAN;
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format.frame_rate = (float) _this->spec.freq;
format.channel_count = _this->spec.channels; /* !!! FIXME: support > 2? */
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while ((!valid_datatype) && (test_format)) {
valid_datatype = 1;
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_this->spec.format = test_format;
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switch (test_format) {
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case AUDIO_S8:
format.format = media_raw_audio_format::B_AUDIO_CHAR;
break;
case AUDIO_U8:
format.format = media_raw_audio_format::B_AUDIO_UCHAR;
break;
case AUDIO_S16LSB:
format.format = media_raw_audio_format::B_AUDIO_SHORT;
break;
case AUDIO_S16MSB:
format.format = media_raw_audio_format::B_AUDIO_SHORT;
format.byte_order = B_MEDIA_BIG_ENDIAN;
break;
case AUDIO_S32LSB:
format.format = media_raw_audio_format::B_AUDIO_INT;
break;
case AUDIO_S32MSB:
format.format = media_raw_audio_format::B_AUDIO_INT;
format.byte_order = B_MEDIA_BIG_ENDIAN;
break;
case AUDIO_F32LSB:
format.format = media_raw_audio_format::B_AUDIO_FLOAT;
break;
case AUDIO_F32MSB:
format.format = media_raw_audio_format::B_AUDIO_FLOAT;
format.byte_order = B_MEDIA_BIG_ENDIAN;
break;
default:
valid_datatype = 0;
test_format = SDL_NextAudioFormat();
break;
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format.buffer_size = _this->spec.samples;
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if (!valid_datatype) { /* shouldn't happen, but just in case... */
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BEOSAUDIO_CloseDevice(_this);
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SDL_SetError("Unsupported audio format");
return 0;
}
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/* Calculate the final parameters for this audio specification */
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SDL_CalculateAudioSpec(&_this->spec);
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/* Subscribe to the audio stream (creates a new thread) */
sigset_t omask;
SDL_MaskSignals(&omask);
_this->hidden->audio_obj = new BSoundPlayer(&format, "SDL Audio",
FillSound, NULL, _this);
SDL_UnmaskSignals(&omask);
if (_this->hidden->audio_obj->Start() == B_NO_ERROR) {
_this->hidden->audio_obj->SetHasData(true);
} else {
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BEOSAUDIO_CloseDevice(_this);
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SDL_SetError("Unable to start Be audio");
return 0;
}
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/* We're running! */
return 1;
}
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static void
BEOSAUDIO_Deinitialize(void)
{
SDL_QuitBeApp();
}
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BEOSAUDIO_Init(SDL_AudioDriverImpl *impl)
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/* Initialize the Be Application, if it's not already started */
if (SDL_InitBeApp() < 0) {
return 0;
}
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/* Set the function pointers */
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impl->OpenDevice = BEOSAUDIO_OpenDevice;
impl->CloseDevice = BEOSAUDIO_CloseDevice;
impl->Deinitialize = BEOSAUDIO_Deinitialize;
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impl->ProvidesOwnCallbackThread = 1;
impl->OnlyHasDefaultOutputDevice = 1;
return 1;
}
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extern "C" { extern AudioBootStrap BEOSAUDIO_bootstrap; }
AudioBootStrap BEOSAUDIO_bootstrap = {
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"baudio", "BeOS BSoundPlayer", BEOSAUDIO_Init, 0
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/* vi: set ts=4 sw=4 expandtab: */