/*

    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

*/

#include "SDL_config.h"

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

/* patch for IRIX 5 by Georg Schwarz 18/07/2004 */

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "../SDL_audiomem.h"

#include "../SDL_audio_c.h"

#include "SDL_irixaudio.h"

#ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */

#define OLD_IRIX_AUDIO

#define alClosePort(x) ALcloseport(x)

#define alFreeConfig(x) ALfreeconfig(x)

#define alGetFillable(x) ALgetfillable(x)

#define alNewConfig() ALnewconfig()

#define alOpenPort(x,y,z) ALopenport(x,y,z)

#define alSetChannels(x,y) ALsetchannels(x,y)

#define alSetQueueSize(x,y) ALsetqueuesize(x,y)

#define alSetSampFmt(x,y) ALsetsampfmt(x,y)

#define alSetWidth(x,y) ALsetwidth(x,y)

#endif

/* 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)

{

	SDL_free(device->hidden);

	SDL_free(device);

}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)

{

	SDL_AudioDevice *this;

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

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

	if ( this ) {

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

		this->hidden = (struct SDL_PrivateAudioData *)

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

	}

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

		SDL_OutOfMemory();

		if ( this ) {

			SDL_free(this);

		}

		return(0);

	}

	SDL_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)

{

	Uint16 test_format = SDL_FirstAudioFormat(spec->format);

	long width = 0;

	long fmt = 0;

	int valid = 0;

#ifdef OLD_IRIX_AUDIO

	{

		long audio_param[2];

		audio_param[0] = AL_OUTPUT_RATE;

		audio_param[1] = spec->freq;

		valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0);

	}

#else

	{

		ALpv audio_param;

		audio_param.param = AL_RATE;

		audio_param.value.i = spec->freq;

		valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0);

	}

#endif

	while ((!valid) && (test_format)) {

		valid = 1;

		spec->format = test_format;

		switch (test_format) {

			case AUDIO_S8:

				width = AL_SAMPLE_8;

				fmt = AL_SAMPFMT_TWOSCOMP;

				break;

			case AUDIO_S16SYS:

				width = AL_SAMPLE_16;

				fmt = AL_SAMPFMT_TWOSCOMP;

				break;

			default:

				valid = 0;

				test_format = SDL_NextAudioFormat();

				break;

		}

		if (valid) {

			ALconfig audio_config = alNewConfig();

			valid = 0;

			if (audio_config) {

				if (alSetChannels(audio_config, spec->channels) < 0) {

					if (spec->channels > 2) {  /* can't handle > stereo? */

						spec->channels = 2;  /* try again below. */

					}

				}

				if ((alSetSampFmt(audio_config, fmt) >= 0) &&

				    ((!width) || (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);

					if (audio_port == NULL) {

						/* docs say AL_BAD_CHANNELS happens here, too. */

						int err = oserror();

						if (err == AL_BAD_CHANNELS) {

							spec->channels = 2;

							alSetChannels(audio_config, spec->channels);

							audio_port = alOpenPort("SDL audio", "w",

							                        audio_config);

						}

					}

					if (audio_port != NULL) {

						valid = 1;

					}

				}

				alFreeConfig(audio_config);

			}

		}

	}

	if (!valid) {

		SDL_SetError("Unsupported audio format");

		return (-1);

	}

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

	SDL_CalculateAudioSpec(spec);

	/* Allocate mixing buffer */

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

	if (mixbuf == NULL) {

		SDL_OutOfMemory();

		return (-1);

	}

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

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

	return (0);

}