/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997, 1998  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

    5635-34 Springhouse Dr.

    Pleasanton, CA 94588 (USA)

    slouken@libsdl.org

*/

#ifdef SAVE_RCSID

static char rcsid =

 "@(#) $Id$";

#endif

/* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */

#include <stdlib.h>

#include "SDL_endian.h"

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "SDL_audiomem.h"

#include "SDL_audio_c.h"

#include "SDL_irixaudio.h"

/* Audio driver functions */

static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void AL_WaitAudio(_THIS);

static void AL_PlayAudio(_THIS);

static Uint8 *AL_GetAudioBuf(_THIS);

static void AL_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 *this;

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

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

	if ( this ) {

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

		this->hidden = (struct SDL_PrivateAudioData *)

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

	}

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

		SDL_OutOfMemory();

		if ( this ) {

			free(this);

		}

		return(0);

	}

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

	/* Set the function pointers */

	this->OpenAudio = AL_OpenAudio;

	this->WaitAudio = AL_WaitAudio;

	this->PlayAudio = AL_PlayAudio;

	this->GetAudioBuf = AL_GetAudioBuf;

	this->CloseAudio = AL_CloseAudio;

	this->free = Audio_DeleteDevice;

	return this;

}

AudioBootStrap DMEDIA_bootstrap = {

	"AL", "IRIX DMedia audio",

	Audio_Available, Audio_CreateDevice

};

void static AL_WaitAudio(_THIS)

{

	Sint32 timeleft;

	timeleft = this->spec.samples - alGetFillable(audio_port);

	if ( timeleft > 0 ) {

		timeleft /= (this->spec.freq/1000);

		SDL_Delay((Uint32)timeleft);

	}

}

static void AL_PlayAudio(_THIS)

{

	/* Write the audio data out */

	if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {

		/* Assume fatal error, for now */

		this->enabled = 0;

	}

}

static Uint8 *AL_GetAudioBuf(_THIS)

{

	return(mixbuf);

}

static void AL_CloseAudio(_THIS)

{

	if ( mixbuf != NULL ) {

		SDL_FreeAudioMem(mixbuf);

		mixbuf = NULL;

	}

	if ( audio_port != NULL ) {

		alClosePort(audio_port);

		audio_port = NULL;

	}

}

static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

	ALconfig audio_config;

	ALpv audio_param;

	int width;

	/* Determine the audio parameters from the AudioSpec */

	switch ( spec->format & 0xFF ) {

		case 8: { /* Signed 8 bit audio data */

			spec->format = AUDIO_S8;

			width = AL_SAMPLE_8;

		}

		break;

		case 16: { /* Signed 16 bit audio data */

			spec->format = AUDIO_S16MSB;

			width = AL_SAMPLE_16;

		}

		break;

		default: {

			SDL_SetError("Unsupported audio format");

			return(-1);

		}

	}

	/* Update the fragment size as size in bytes */

	SDL_CalculateAudioSpec(spec);

	/* Set output frequency */

	audio_param.param = AL_RATE;

	audio_param.value.i = spec->freq;

	if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {

		SDL_SetError("alSetParams failed");

		return(-1);

	}

	/* Open the audio port with the requested frequency */

	audio_port = NULL;

	audio_config = alNewConfig();

	if ( audio_config &&

	     (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&

	     (alSetWidth(audio_config, width) >= 0) &&

	     (alSetQueueSize(audio_config, spec->samples*2) >= 0) &&

	     (alSetChannels(audio_config, spec->channels) >= 0) ) {

		audio_port = alOpenPort("SDL audio", "w", audio_config);

	}

	alFreeConfig(audio_config);

	if( audio_port == NULL ) {

		SDL_SetError("Unable to open audio port");

		return(-1);

	}

	/* Allocate mixing buffer */

	mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);

	if ( mixbuf == NULL ) {

		SDL_OutOfMemory();

		return(-1);

	}

	memset(mixbuf, spec->silence, spec->size);

	/* We're ready to rock and roll. :-) */

	return(0);

}