/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997 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@devolution.com

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

/* Allow access to the audio stream on BeOS */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <SoundPlayer.h>

#include "SDL_BeApp.h"

extern "C" {

#include "SDL_audio.h"

#include "SDL_audio_c.h"

#include "SDL_sysaudio.h"

#include "SDL_systhread_c.h"

#include "SDL_beaudio.h"

/* Audio driver functions */

static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void BE_WaitAudio(_THIS);

static void BE_PlayAudio(_THIS);

static Uint8 *BE_GetAudioBuf(_THIS);

static void BE_CloseAudio(_THIS);

/* Audio driver bootstrap functions */

static int Audio_Available(void)

{

return(1);

}

static void Audio_DeleteDevice(SDL_AudioDevice *device)

{

free(device->hidden);

free(device);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

SDL_AudioDevice *device;

/* Initialize all variables that we clean on shutdown */

device = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));

if ( device ) {

memset(device, 0, (sizeof *device));

device->hidden = (struct SDL_PrivateAudioData *)

malloc((sizeof *device->hidden));

}

if ( (device == NULL) || (device->hidden == NULL) ) {

SDL_OutOfMemory();

if ( device ) {

free(device);

}

return(0);

}

memset(device->hidden, 0, (sizeof *device->hidden));

/* Set the function pointers */

device->OpenAudio = BE_OpenAudio;

device->WaitAudio = BE_WaitAudio;

device->PlayAudio = BE_PlayAudio;

device->GetAudioBuf = BE_GetAudioBuf;

device->CloseAudio = BE_CloseAudio;

device->free = Audio_DeleteDevice;

return device;

}

AudioBootStrap BAUDIO_bootstrap = {

"baudio", "BeOS BSoundPlayer",

Audio_Available, Audio_CreateDevice

};

/* 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;

/* Silence the buffer, since it's ours */

memset(stream, audio->spec.silence, len);

/* Only do soemthing if audio is enabled */

if ( ! audio->enabled )

return;

if ( ! audio->paused ) {

if ( audio->convert.needed ) {

SDL_mutexP(audio->mixer_lock);

(*audio->spec.callback)(audio->spec.userdata,

(Uint8 *)audio->convert.buf,audio->convert.len);

SDL_mutexV(audio->mixer_lock);

SDL_ConvertAudio(&audio->convert);

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);

}

}

return;

}

/* Dummy functions -- we don't use thread-based audio */

void BE_WaitAudio(_THIS)

{

return;

}

void BE_PlayAudio(_THIS)

{

return;

}

Uint8 *BE_GetAudioBuf(_THIS)

{

return(NULL);

}

void BE_CloseAudio(_THIS)

{

if ( audio_obj ) {

audio_obj->Stop();

delete audio_obj;

audio_obj = NULL;

}

/* Quit the Be Application, if there's nothing left to do */

SDL_QuitBeApp();

}

int BE_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

media_raw_audio_format format;

/* Initialize the Be Application, if it's not already started */

if ( SDL_InitBeApp() < 0 ) {

return(-1);

}

/* Parse the audio format and fill the Be raw audio format */

format.frame_rate = (float)spec->freq;

format.channel_count = spec->channels;

switch (spec->format&~0x1000) {

case AUDIO_S8:

/* Signed 8-bit audio unsupported, convert to U8 */

spec->format = AUDIO_U8;

case AUDIO_U8:

format.format = media_raw_audio_format::B_AUDIO_UCHAR;

format.byte_order = 0;

break;

case AUDIO_U16:

/* Unsigned 16-bit audio unsupported, convert to S16 */

spec->format ^= 0x8000;

case AUDIO_S16:

format.format = media_raw_audio_format::B_AUDIO_SHORT;

if ( spec->format & 0x1000 ) {

format.byte_order = 1; /* Big endian */

} else {

format.byte_order = 2; /* Little endian */

}

break;

}

format.buffer_size = spec->samples;

/* Calculate the final parameters for this audio specification */

SDL_CalculateAudioSpec(spec);

/* Subscribe to the audio stream (creates a new thread) */

{ sigset_t omask;

SDL_MaskSignals(&omask);

audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound,

NULL, _this);

SDL_UnmaskSignals(&omask);

}

if ( audio_obj->Start() == B_NO_ERROR ) {

audio_obj->SetHasData(true);

} else {

SDL_SetError("Unable to start Be audio");

return(-1);

}

/* We're running! */

return(1);

}

}; /* Extern C */