/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 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

    Lesser General Public License for more details.

    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

    Sam Lantinga

    slouken@libsdl.org

*/

/* 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 */