/*
   XMMS-SID - SIDPlay input plugin for X MultiMedia System (XMMS)

   libSIDPlay v1 support

   Programmed and designed by Matti 'ccr' Hamalainen <ccr@tnsp.org>
   (C) Copyright 1999-2007 Tecnic Software productions (TNSP)

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "xmms-sid.h"

#ifdef HAVE_SIDPLAY1

#include <stdio.h>
#include "xs_sidplay1.h"
#include "xs_config.h"

#include <sidplay/player.h>
#include <sidplay/myendian.h>
#include <sidplay/fformat.h>


/* Maximum audio frequency supported by libSIDPlay v1 */
#define SIDPLAY1_MAX_FREQ	(48000)


typedef struct {
	emuEngine *currEng;
	emuConfig currConfig;
	sidTune *currTune;
	guint8 *buf;
	size_t bufSize;
} xs_sidplay1_t;


/* We need to 'export' all this pseudo-C++ crap */
extern "C" {


/* Return song information
 */
#define	TFUNCTION	xs_sidplay1_getinfo
#define	TFUNCTION2	xs_sidplay1_updateinfo
#define	TTUNEINFO	sidTuneInfo
#define	TTUNE		sidTune
#define TENGINE		xs_sidplay1_t
#include "xs_sidplay.h"


/* Check if we can play the given file
 */
gboolean xs_sidplay1_probe(xs_file_t *f)
{
	gchar tmpBuf[4];
	
	if (!f) return FALSE;
	
	if (xs_fread(tmpBuf, sizeof(gchar), 4, f) != 4)
		return FALSE;
	
	if (!strncmp(tmpBuf, "PSID", 4))
		return TRUE;
	else
		return FALSE;
}


/* Initialize SIDPlay1
 */
gboolean xs_sidplay1_init(xs_status_t * myStatus)
{
	gint tmpFreq;
	xs_sidplay1_t *myEngine;
	assert(myStatus);

	/* Allocate internal structures */
	myEngine = (xs_sidplay1_t *) g_malloc0(sizeof(xs_sidplay1_t));
	if (!myEngine) return FALSE;

	/* Initialize engine */
	myEngine->currEng = new emuEngine();
	if (!myEngine->currEng) {
		xs_error("[SIDPlay1] Could not initialize emulation engine.\n");
		g_free(myEngine);
		return FALSE;
	}

	/* Verify endianess */
	if (!myEngine->currEng->verifyEndianess()) {
		xs_error("[SIDPlay1] Endianess verification failed.\n");
		delete myEngine->currEng;
		g_free(myEngine);
		return FALSE;
	}

	myStatus->sidEngine = myEngine;

	/* Get current configuration */
	myEngine->currEng->getConfig(myEngine->currConfig);

	/* Configure channel parameters */
	switch (myStatus->audioChannels) {

	case XS_CHN_AUTOPAN:
		myEngine->currConfig.channels = SIDEMU_STEREO;
		myEngine->currConfig.autoPanning = SIDEMU_CENTEREDAUTOPANNING;
		myEngine->currConfig.volumeControl = SIDEMU_FULLPANNING;
		break;

	case XS_CHN_STEREO:
		myEngine->currConfig.channels = SIDEMU_STEREO;
		myEngine->currConfig.autoPanning = SIDEMU_NONE;
		myEngine->currConfig.volumeControl = SIDEMU_NONE;
		break;

	case XS_CHN_MONO:
	default:
		myEngine->currConfig.channels = SIDEMU_MONO;
		myEngine->currConfig.autoPanning = SIDEMU_NONE;
		myEngine->currConfig.volumeControl = SIDEMU_NONE;
		myStatus->audioChannels = XS_CHN_MONO;
		break;
	}


	/* Memory mode settings */
	switch (xs_cfg.memoryMode) {
	case XS_MPU_TRANSPARENT_ROM:
		myEngine->currConfig.memoryMode = MPU_TRANSPARENT_ROM;
		break;

	case XS_MPU_PLAYSID_ENVIRONMENT:
		myEngine->currConfig.memoryMode = MPU_PLAYSID_ENVIRONMENT;
		break;

	case XS_MPU_BANK_SWITCHING:
	default:
		myEngine->currConfig.memoryMode = MPU_BANK_SWITCHING;
		xs_cfg.memoryMode = XS_MPU_BANK_SWITCHING;
		break;
	}


	/* Audio parameters sanity checking and setup */
	myEngine->currConfig.bitsPerSample = myStatus->audioBitsPerSample;
	tmpFreq = myStatus->audioFrequency;

	if (myStatus->oversampleEnable) {
		if ((tmpFreq * myStatus->oversampleFactor) > SIDPLAY1_MAX_FREQ) {
			myStatus->oversampleEnable = FALSE;
		} else {
			tmpFreq = (tmpFreq * myStatus->oversampleFactor);
		}
	} else {
		if (tmpFreq > SIDPLAY1_MAX_FREQ)
			tmpFreq = SIDPLAY1_MAX_FREQ;
	}

	myEngine->currConfig.frequency = tmpFreq;

	switch (myStatus->audioBitsPerSample) {
	case XS_RES_8BIT:
		switch (myStatus->audioFormat) {
		case FMT_S8:
			myStatus->audioFormat = FMT_S8;
			myEngine->currConfig.sampleFormat = SIDEMU_SIGNED_PCM;
			break;

		case FMT_U8:
		default:
			myStatus->audioFormat = FMT_U8;
			myEngine->currConfig.sampleFormat = SIDEMU_UNSIGNED_PCM;
			break;
		}
		break;

	case XS_RES_16BIT:
	default:
		switch (myStatus->audioFormat) {
		case FMT_U16_NE:
		case FMT_U16_LE:
		case FMT_U16_BE:
			myStatus->audioFormat = FMT_U16_NE;
			myEngine->currConfig.sampleFormat = SIDEMU_UNSIGNED_PCM;
			break;

		case FMT_S16_NE:
		case FMT_S16_LE:
		case FMT_S16_BE:
		default:
			myStatus->audioFormat = FMT_S16_NE;
			myEngine->currConfig.sampleFormat = SIDEMU_SIGNED_PCM;
			break;
		}
		break;
	}

	/* Clockspeed settings */
	switch (xs_cfg.clockSpeed) {
	case XS_CLOCK_NTSC:
		myEngine->currConfig.clockSpeed = SIDTUNE_CLOCK_NTSC;
		break;

	case XS_CLOCK_PAL:
	default:
		myEngine->currConfig.clockSpeed = SIDTUNE_CLOCK_PAL;
		xs_cfg.clockSpeed = XS_CLOCK_PAL;
		break;
	}

	myEngine->currConfig.forceSongSpeed = xs_cfg.forceSpeed;
	
	
	/* Configure rest of the emulation */
	/* if (xs_cfg.forceModel) */
	myEngine->currConfig.mos8580 = xs_cfg.mos8580;
	myEngine->currConfig.emulateFilter = xs_cfg.emulateFilters;
	myEngine->currConfig.filterFs = xs_cfg.sid1FilterFs;
	myEngine->currConfig.filterFm = xs_cfg.sid1FilterFm;
	myEngine->currConfig.filterFt = xs_cfg.sid1FilterFt;


	/* Now set the emulator configuration */
	if (!myEngine->currEng->setConfig(myEngine->currConfig)) {
		xs_error("[SIDPlay1] Emulator engine configuration failed!\n");
		return FALSE;
	}
	
	/* Create sidtune object */
	myEngine->currTune = new sidTune(0);
	if (!myEngine->currTune) {
		xs_error("[SIDPlay1] Could not initialize SIDTune object.\n");
		return FALSE;
	}
	
	return TRUE;
}


/* Close SIDPlay1 engine
 */
void xs_sidplay1_close(xs_status_t * myStatus)
{
	xs_sidplay1_t *myEngine;
	assert(myStatus);

	myEngine = (xs_sidplay1_t *) myStatus->sidEngine;

	/* Free internals */
	if (myEngine->currEng) {
		delete myEngine->currEng;
		myEngine->currEng = NULL;
	}

	if (myEngine->currTune) {
		delete myEngine->currTune;
		myEngine->currTune = NULL;
	}

	xs_sidplay1_delete(myStatus);
	
	g_free(myEngine);
	myStatus->sidEngine = NULL;
}


/* Initialize current song and sub-tune
 */
gboolean xs_sidplay1_initsong(xs_status_t * myStatus)
{
	xs_sidplay1_t *myEngine;
	assert(myStatus);

	myEngine = (xs_sidplay1_t *) myStatus->sidEngine;
	if (!myEngine) return FALSE;

	if (!myEngine->currTune) {
		xs_error("[SIDPlay1] SID-tune struct pointer was NULL. This should not happen, report to XMMS-SID author.\n");
		return FALSE;
	}

	if (!myEngine->currTune->getStatus()) {
		xs_error("[SIDPlay1] SID-tune status check failed. This should not happen, report to XMMS-SID author.\n");
		return FALSE;
	}

	myStatus->isInitialized = TRUE;

	return sidEmuInitializeSong(*myEngine->currEng, *myEngine->currTune, myStatus->currSong);
}


/* Emulate and render audio data to given buffer
 */
guint xs_sidplay1_fillbuffer(xs_status_t * myStatus, gchar * audioBuffer, guint audioBufSize)
{
	xs_sidplay1_t *myEngine;
	assert(myStatus);

	myEngine = (xs_sidplay1_t *) myStatus->sidEngine;
	if (!myEngine) return 0;

	sidEmuFillBuffer(*myEngine->currEng, *myEngine->currTune, audioBuffer, audioBufSize);

	return audioBufSize;
}


/* Load a given SID-tune file
 */
gboolean xs_sidplay1_load(xs_status_t * myStatus, gchar * filename)
{
	xs_sidplay1_t *myEngine;
	assert(myStatus);
	myStatus->isInitialized = FALSE;

	myEngine = (xs_sidplay1_t *) myStatus->sidEngine;
	if (!myEngine) return FALSE;

	/* Try to get the tune */
	if (!filename) return FALSE;
	
	if (xs_fload_buffer(filename, &(myEngine->buf), &(myEngine->bufSize)) != 0)
		return FALSE;
	
	if (!myEngine->currTune->load(myEngine->buf, myEngine->bufSize))
		return FALSE;

	return TRUE;
}


/* Delete INTERNAL information
 */
void xs_sidplay1_delete(xs_status_t * myStatus)
{
	xs_sidplay1_t *myEngine;
	assert(myStatus);

	myEngine = (xs_sidplay1_t *) myStatus->sidEngine;
	if (!myEngine) return;
	
	g_free(myEngine->buf);
	myEngine->buf = NULL;
	myEngine->bufSize = 0;
}


}	/* extern "C" */
#endif	/* HAVE_SIDPLAY1 */