scummvm/sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001/2002 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#include "stdafx.h"
#include "scumm.h"
#include "sound/mididrv.h"
#include "sound/imuse.h"
#include <sys/stat.h>

#ifdef _WIN32_WCE
extern void *bsearch(const void *, const void *, size_t,
										 size_t, int (*x) (const void *, const void *));
#endif

void Scumm::addSoundToQueue(int sound)
{
	if (!(_features & GF_AFTER_V7)) {
		_vars[VAR_LAST_SOUND] = sound;
		ensureResourceLoaded(rtSound, sound);
		addSoundToQueue2(sound);
	}

	if (_features & GF_AUDIOTRACKS)
		warning("Requesting audio track: %d", sound);
}

void Scumm::addSoundToQueue2(int sound)
{
	if (_soundQue2Pos < 10) {
		_soundQue2[_soundQue2Pos++] = sound;
	}
}

void Scumm::processSoundQues()
{
	byte d;
	int i, j;
	int num;
	int16 data[16];
	IMuse *se;

	processSfxQueues();

	while (_soundQue2Pos) {
		d = _soundQue2[--_soundQue2Pos];
		if (d)
			playSound(d);
	}

	for (i = 0; i < _soundQuePos;) {
		num = _soundQue[i++];
		if (i + num > _soundQuePos) {
			warning("processSoundQues: invalid num value");
			break;
		}
		for (j = 0; j < 16; j++)
			data[j] = 0;
		if (num > 0) {
			for (j = 0; j < num; j++)
				data[j] = _soundQue[i + j];
			i += num;

			se = _imuse;
#if 0
			debug(1, "processSoundQues(%d,%d,%d,%d,%d,%d,%d,%d,%d)",
						data[0] >> 8,
						data[0] & 0xFF,
						data[1], data[2], data[3], data[4], data[5], data[6], data[7]
				);
#endif
			if (!(_features & GF_AFTER_V7)) {
				if (se)
					_vars[VAR_SOUNDRESULT] =
						(short)se->do_command(data[0], data[1], data[2], data[3], data[4],
																	data[5], data[6], data[7]);
			}

		}
	}
	_soundQuePos = 0;
}

void Scumm::playSound(int sound)
{
	byte *ptr;
	IMuse *se = _imuse;

	ptr = getResourceAddress(rtSound, sound);
	if (ptr != NULL && READ_UINT32_UNALIGNED(ptr) == MKID('SOUN')) {
		ptr += 8;
#ifdef COMPRESSED_SOUND_FILE
		if ((playMP3CDTrack(ptr[16], ptr[17] == 0xff ? -1 : ptr[17],
						(ptr[18] * 60 + ptr[19]) * 75 + ptr[20], 0)) == -1)
#endif
 		_system->play_cdrom(ptr[16], ptr[17] == 0xff ? -1 : ptr[17],
 						(ptr[18] * 60 + ptr[19]) * 75 + ptr[20], 0);

		current_cd_sound = sound;
		return;
	}

	if ((_features & GF_OLD256) || (_gameId == GID_MONKEY_VGA))
		return;											/* FIXME */

	if (se) {
		getResourceAddress(rtSound, sound);
		se->start_sound(sound);
	}
}

void Scumm::processSfxQueues()
{
	Actor *a;
	int act;
	bool b, finished;

	if (_talk_sound_mode != 0) {
		if (_talk_sound_mode == 2)
			_talkChannel = startTalkSound(_talk_sound_a, _talk_sound_b, _talk_sound_mode);
		else
			startTalkSound(_talk_sound_a, _talk_sound_b, _talk_sound_mode);
		_talk_sound_mode = 0;
	}

	if (_vars[VAR_TALK_ACTOR]) { //_sfxMode == 2) {
		act = _vars[VAR_TALK_ACTOR];
		if (_talkChannel < 0)
			finished = false;
		else if (_mixer->_channels[_talkChannel] == NULL)
			finished = true;
		else
			finished = false;
		

		if (act != 0 && (uint) act < 0x80 && !string[0].no_talk_anim) {
			a = derefActorSafe(act, "processSfxQueues");
			if (a->room == _currentRoom && (finished || !_endOfMouthSync)) {
				b = true;
				if (!finished)
					b = isMouthSyncOff(_curSoundPos);
				if (_mouthSyncMode != b) {
					_mouthSyncMode = b;
					startAnimActor(a, b ? a->talkFrame2 : a->talkFrame1);
				}
			}
		}
		
		if (finished  && _talkDelay == 0) {
			stopTalk();
			_sfxMode = 0;
			_talkChannel = -1;
		}
	}
		
	if (_sfxMode == 1) {
		if (isSfxFinished()) {
			_sfxMode = 0;
		}
	}
}

#ifdef COMPRESSED_SOUND_FILE
static int compar(const void *a, const void *b)
{
	return ((MP3OffsetTable *) a)->org_offset -
		((MP3OffsetTable *) b)->org_offset;
}
#endif

int Scumm::startTalkSound(uint32 offset, uint32 b, int mode)
{
	int num = 0, i;
	byte file_byte, file_byte_2;
	int size;

	if (!_sfxFile) {
		warning("startTalkSound: SFX file is not open");
		return -1;
	}

	if (b > 8) {
		num = (b - 8) >> 1;
	}
#ifdef COMPRESSED_SOUND_FILE
	if (offset_table != NULL) {
		MP3OffsetTable *result = NULL, key;

		key.org_offset = offset;
		result = (MP3OffsetTable *) bsearch(&key, offset_table, num_sound_effects,
		                                    sizeof(MP3OffsetTable), compar);

		if (result == NULL) {
			warning("startTalkSound: did not find sound at offset %d !", offset);
			return -1;
		}
		if (2 * num != result->num_tags) {
			warning("startTalkSound: number of tags do not match (%d - %d) !", b,
							result->num_tags);
			num = result->num_tags;
		}
		offset = result->new_offset;
		size = result->compressed_size;
	} else
#endif
	{
		offset += 8;
		size = -1;
	}

	fileSeek((FILE *) _sfxFile, offset, SEEK_SET);
	i = 0;
	while (num > 0) {
		fileRead((FILE *) _sfxFile, &file_byte, sizeof(file_byte));
		fileRead((FILE *) _sfxFile, &file_byte_2, sizeof(file_byte_2));
		_mouthSyncTimes[i++] = file_byte | (file_byte_2 << 8);
		num--;
	}
	_mouthSyncTimes[i] = 0xFFFF;
	_sfxMode = mode;
	_curSoundPos = 0;
	_mouthSyncMode = true;

	return startSfxSound(_sfxFile, size);
}

void Scumm::stopTalkSound()
{
	if (_sfxMode == 2) {
		stopSfxSound();
		_sfxMode = 0;
	}
}

bool Scumm::isMouthSyncOff(uint pos)
{
	uint j;
	bool val = true;
	uint16 *ms = _mouthSyncTimes;

	_endOfMouthSync = false;
	do {
		val ^= 1;
		j = *ms++;
		if (j == 0xFFFF) {
			_endOfMouthSync = true;
			break;
		}
	} while (pos > j);
	return val;
}


int Scumm::isSoundRunning(int sound)
{
	IMuse *se;
	int i;

	if (sound == current_cd_sound)
#ifdef COMPRESSED_SOUND_FILE
		if (pollMP3CD())
			return 1;
		else
#endif
			return _system->poll_cdrom();

	i = _soundQue2Pos;
	while (i--) {
		if (_soundQue2[i] == sound)
			return 1;
	}

	if (isSoundInQueue(sound))
		return 1;

	if (!isResourceLoaded(rtSound, sound))
		return 0;

	se = _imuse;
	if (!se)
		return 0;
	return se->get_sound_status(sound);
}

bool Scumm::isSoundInQueue(int sound)
{
	int i = 0, j, num;
	int16 table[16];

	while (i < _soundQuePos) {
		num = _soundQue[i++];

		memset(table, 0, sizeof(table));

		if (num > 0) {
			for (j = 0; j < num; j++)
				table[j] = _soundQue[i + j];
			i += num;
			if (table[0] == 0x10F && table[1] == 8 && table[2] == sound)
				return 1;
		}
	}
	return 0;
}

void Scumm::stopSound(int a)
{
	IMuse *se;
	int i;

	if (a == current_cd_sound) {
		current_cd_sound = 0;
#ifdef COMPRESSED_SOUND_FILE
		if (stopMP3CD() == -1)
#endif
			_system->stop_cdrom();
	}

	se = _imuse;
	if (se)
		se->stop_sound(a);

	for (i = 0; i < 10; i++)
		if (_soundQue2[i] == (byte)a)
			_soundQue2[i] = 0;
}

void Scumm::stopAllSounds()
{
	IMuse *se = _imuse;

	if (current_cd_sound != 0) {
		current_cd_sound = 0;
#ifdef COMPRESSED_SOUND_FILE
		if (stopMP3CD() == -1)
#endif
			_system->stop_cdrom();
	}

	if (se) {
		se->stop_all_sounds();
		se->clear_queue();
	}
	clearSoundQue();
	stopSfxSound();
}

void Scumm::clearSoundQue()
{
	_soundQue2Pos = 0;
	memset(_soundQue2, 0, sizeof(_soundQue2));
}

void Scumm::soundKludge(int16 * list)
{
	int16 *ptr;
	int i;

	if (list[0] == -1) {
		processSoundQues();
		return;
	}
	_soundQue[_soundQuePos++] = 8;

	ptr = _soundQue + _soundQuePos;
	_soundQuePos += 8;

	for (i = 0; i < 8; i++)
		*ptr++ = list[i];
	if (_soundQuePos > 0x100)
		error("Sound que buffer overflow");
}

void Scumm::talkSound(uint32 a, uint32 b, int mode)
{
	_talk_sound_a = a;
	_talk_sound_b = b;
	_talk_sound_mode = mode;
}

/* The sound code currently only supports General Midi.
 * General Midi is used in Day Of The Tentacle.
 * Roland music is also playable, but doesn't sound well.
 * A mapping between roland instruments and GM instruments
 * is needed.
 */

void Scumm::setupSound()
{
	IMuse *se = _imuse;
	if (se) {
		se->setBase(res.address[rtSound]);
		if (!scummcfg->get("music_volume", "scummvm"))
			_sound_volume_music = 60;
		else
			_sound_volume_music = atoi(scummcfg->get("music_volume", "scummvm"));
		if (!scummcfg->get("master_volume", "scummvm"))
			_sound_volume_master = 125;
		else
			_sound_volume_master = atoi(scummcfg->get("master_volume", "scummvm"));			
		if (!scummcfg->get("sfx_volume", "scummvm"))
			_sound_volume_sfx = 100;
		else
			_sound_volume_sfx = atoi(scummcfg->get("sfx_volume", "scummvm"));

		se->set_master_volume(_sound_volume_master);
		se->set_music_volume(_sound_volume_music);
		_mixer->set_volume(_sound_volume_sfx);
	}
	_sfxFile = openSfxFile();
}

void Scumm::pauseSounds(bool pause)
{
	IMuse *se = _imuse;
	if (se)
		se->pause(pause);
	_soundsPaused = pause;
	_mixer->pause(pause);	
}

enum {
	SOUND_HEADER_SIZE = 26,
	SOUND_HEADER_BIG_SIZE = 26 + 8,

};

int Scumm::startSfxSound(void *file, int file_size)
{
	char ident[8];
	int block_type;
	byte work[8];
	uint size = 0, i;
	int rate, comp;
	byte *data;

#ifdef COMPRESSED_SOUND_FILE
	if (file_size > 0) {
		data = (byte *)calloc(file_size + MAD_BUFFER_GUARD, 1);

		if (fread(data, file_size, 1, (FILE *) file) != 1) {
			/* no need to free the memory since error will shut down */
			error("startSfxSound: cannot read %d bytes", size);
			return -1;
		}
		return playSfxSound_MP3(data, file_size);
	}
#endif
	if (fread(ident, 8, 1, (FILE *) file) != 1)
		goto invalid;

	if (!memcmp(ident, "VTLK", 4)) {
		fseek((FILE *) file, SOUND_HEADER_BIG_SIZE - 8, SEEK_CUR);
	} else if (!memcmp(ident, "Creative", 8)) {
		fseek((FILE *) file, SOUND_HEADER_SIZE - 8, SEEK_CUR);
	} else {
	invalid:;
		warning("startSfxSound: invalid header");
		return -1;
	}

	block_type = getc((FILE *) file);
	if (block_type != 1) {
		warning("startSfxSound: Expecting block_type == 1, got %d", block_type);
		return -1;
	}

	fread(work, 3, 1, (FILE *) file);

	size = (work[0] | (work[1] << 8) | (work[2] << 16)) - 2;
	rate = getc((FILE *) file);
	comp = getc((FILE *) file);

	if (comp != 0) {
		warning("startSfxSound: Unsupported compression type %d", comp);
		return -1;
	}

	data = (byte *)malloc(size);
	if (data == NULL) {
		error("startSfxSound: out of memory");
		return -1;
	}

	if (fread(data, size, 1, (FILE *) file) != 1) {
		/* no need to free the memory since error will shut down */
		error("startSfxSound: cannot read %d bytes", size);
		return -1;
	}
	for (i = 0; i < size; i++) {
		// Fixme: From WinCE port
		if (_sound_volume_sfx != 100)
			data[i] = _sound_volume_sfx * data[i] / 100;

		data[i] ^= 0x80;
	}
	return playSfxSound(data, size, 1000000 / (256 - rate));
}


#ifdef COMPRESSED_SOUND_FILE
static int get_int(FILE * f)
{
	int ret = 0;
	for (int size = 0; size < 4; size++) {
		int c = fgetc(f);
		if (c == EOF) {
			error("Unexpected end of file !!!");
		}
		ret <<= 8;
		ret |= c;
	}
	return ret;
}
#endif

void *Scumm::openSfxFile()
{
	char buf[50];
	FILE *file = NULL;

	if (_gameId == GID_DIG) {
		int tag, offset, num_files;
		
		sprintf(buf, "%s%svoice.bun", _gameDataPath, _exe_name);
		file = fopen(buf, "rb");
		if (!file) {
			warning("Unable to open DIG voice bundle: %s", buf);
			return NULL;
		}

		tag = fileReadDwordBE(file);
		offset = fileReadDwordBE(file);
		num_files = fileReadDwordBE(file);

		bundle_table = (BundleAudioTable *) malloc(num_files * sizeof(BundleAudioTable));
		num_sound_effects = num_files;
		fileSeek(file, offset, SEEK_SET);

		for (int i=0; i < num_files; i++) {
			char filename[13], c;
			int z = 0;
			int z2;
			
			/* Construct filename */
			for (z2=0;z2<8; z2++)
				if ((c = fileReadByte(file)) != 0)
					filename[z++] = c;
			filename[z++] = '.';
			for (z2=0;z2<4;z2++)
				if ((c = fileReadByte(file)) != 0)
					filename[z++] = c;
			filename[z] = '\0';
			strcpy(bundle_table[i].filename, filename);
			bundle_table[i].offset = fileReadDwordBE(file);
			bundle_table[i].size = fileReadDwordBE(file);			
		}

		return file;
	}

	/* Try opening the file <_exe_name>.sou first, eg tentacle.sou.
	 * That way, you can keep .sou files for multiple games in the
	 * same directory */
#ifdef COMPRESSED_SOUND_FILE
	offset_table = NULL;

	sprintf(buf, "%s%s.so3", _gameDataPath, _exe_name);
	file = fopen(buf, "rb");
	if (!file) {
		sprintf(buf, "%smonster.so3", _gameDataPath);
		file = fopen(buf, "rb");
	}
	if (file != NULL) {
		/* Now load the 'offset' index in memory to be able to find the MP3 data

		   The format of the .SO3 file is easy :
		   - number of bytes of the 'index' part
		   - N times the following fields (4 bytes each) :
		   + offset in the original sound file
		   + offset of the MP3 data in the .SO3 file WITHOUT taking into account
		   the index field and the 'size' field
		   + the number of 'tags'
		   + the size of the MP3 data
		   - and then N times :
		   + the tags
		   + the MP3 data
		 */
		int size, compressed_offset;
		MP3OffsetTable *cur;

		compressed_offset = get_int(file);
		offset_table = (MP3OffsetTable *) malloc(compressed_offset);
		num_sound_effects = compressed_offset / 16;

		size = compressed_offset;
		cur = offset_table;
		while (size > 0) {
			cur[0].org_offset = get_int(file);
			cur[0].new_offset = get_int(file) + compressed_offset + 4; /* The + 4 is to take into accound the 'size' field */
			cur[0].num_tags = get_int(file);
			cur[0].compressed_size = get_int(file);
			size -= 4 * 4;
			cur++;
		}
		return file;
	}
#endif
	sprintf(buf, "%s%s.sou", _gameDataPath, _exe_name);
	file = fopen(buf, "rb");
	if (!file) {
		sprintf(buf, "%smonster.sou", _gameDataPath);
		file = fopen(buf, "rb");
	}
	return file;
}

void Scumm::stopSfxSound()
{
	_mixer->stop_all();
}


bool Scumm::isSfxFinished()
{
	return !_mixer->has_active_channel();
}

#define NextBit bit = mask&1; mask>>=1; if (!--bitsleft) {mask = READ_LE_UINT16(srcptr); srcptr+=2; bitsleft=16;}
int CompDecode(unsigned char *src, unsigned char *dst)
{
	unsigned char *result, *srcptr = src, *dstptr = dst;
	int data, size, bit, bitsleft = 16, mask = READ_LE_UINT16(srcptr);	
	srcptr+=2;

	while(1) {
		NextBit
		if (bit) {
			*dstptr++ = *srcptr++;
		} else {
			NextBit
			if (!bit) {
				NextBit size = bit<<1;
				NextBit size = (size|bit) + 3;
				data = *srcptr++ | 0xffffff00;
			} else {
				data = *srcptr++;
				size = *srcptr++;

				data |= 0xfffff000 + ((size & 0xf0) << 4);
				size = (size & 0x0f) + 3;

				if (size==3)
			 		if (((*srcptr++)+1) == 1)
						return dstptr - dst;	/* End of buffer */
			}
			result = dstptr+data;
			while (size--) 
				*dstptr++=*result++;
		}
	}
}
#undef NextBit

typedef struct {int offset, size, codec;} COMP_table;
void Scumm::decompressBundleSound(int index) {
	int i, z;
	COMP_table table[50];
	unsigned char *CompInput, *CompOutput, *CompFinal, *Final;
	int outputSize, finalSize;

	fileSeek(_sfxFile, bundle_table[index].offset, SEEK_SET);

	int tag = fileReadDwordBE(_sfxFile);
	int num = fileReadDwordBE(_sfxFile);
	fileReadDwordBE(_sfxFile);	 fileReadDwordBE(_sfxFile);
	

	// DO -NOT- change these MKID_BE calls to MKID! If you have
	// to do so, then your ScummSys.H file is detecting the
	// wrong endian. - Ender
	if (tag != MKID_BE('COMP')) {
		warning("Compressed sound %d invalid (%c%c%c%c)", index, tag>>24, tag>>16, tag>>8, tag);
		return;
	}

	/* Read compression table */
	for (i=0; i<num; i++) {
		table[i].offset = fileReadDwordBE(_sfxFile);
		table[i].size   = fileReadDwordBE(_sfxFile);
		table[i].codec  = fileReadDwordBE(_sfxFile);
		fileReadDwordBE(_sfxFile);
	}
	
	CompFinal = (unsigned char *)malloc(1000000);

	finalSize = 0;

	/* Decompress data */
	for (i=0; i<num; i++) {
		unsigned char *p;
		fileSeek(_sfxFile, bundle_table[index].offset + table[i].offset, SEEK_SET);

		CompInput  = (unsigned char *)malloc(table[i].size);
		CompOutput = (unsigned char *)malloc(10000);
		
		fileRead((FILE *)_sfxFile, CompInput, table[i].size);

		switch(table[i].codec) {
			case 0:
				outputSize = table[i].size;
				memcpy(&CompOutput[0], &CompInput[0], outputSize);
			break;

			case 1:
				outputSize = CompDecode(&CompInput[0], &CompOutput[0]);
			break;

			case 2:
				outputSize = CompDecode(&CompInput[0], &CompOutput[0]);
				p = CompOutput;
				for (z = 1; z < outputSize; z++)
					p[z] += p[z - 1];
			break;
			
			case 3: 
				outputSize = CompDecode(&CompInput[0], &CompOutput[0]);
				p = CompOutput;
				for (z = 2; z < outputSize; z++)
					p[z] += p[z - 1];
				for (z = 1; z < outputSize; z++)
					p[z] += p[z - 1];		  				
			break;

			default:
				printf("Unknown codec %d!\n", table[i].codec);
				outputSize = 0;
			break;
		}
		
		memcpy(&CompFinal[finalSize], &CompOutput[0], outputSize);
		finalSize+=outputSize;

		free(CompInput);  CompInput = NULL;
		free(CompOutput); CompOutput= NULL;
	}

	{	/* Parse decompressed data */
		int rate = 22050;
		byte *ptr = CompFinal;
		int tag, size;
		tag = READ_BE_UINT32(ptr); ptr+=4;
		if (tag != MKID_BE('iMUS')) {
			warning("Decompression of bundle sound failed");
			free(CompFinal);
			return;
		}

		ptr+=12;       /* Skip header */
		while(tag != MKID_BE('DATA')) {
			tag = READ_BE_UINT32(ptr);  ptr+=4;
			switch(tag) {
				case MKID_BE('FRMT'):
					size = READ_BE_UINT32(ptr); ptr+=16;					
					rate = READ_BE_UINT32(ptr); ptr+=8;
				break;
				case MKID_BE('TEXT'):
				case MKID_BE('REGN'):
				case MKID_BE('STOP'):
					size = READ_BE_UINT32(ptr); ptr+=size+4;
				break;

				case MKID_BE('DATA'):
					size = READ_BE_UINT32(ptr); ptr+=4;
				break;

				default:
				error("Unknown bundle header %c%c%c%c", tag>>24, tag>>16, tag>>8, tag);
			}
		}

		Final = (unsigned char *)malloc(size);
		memcpy(&Final[0], &ptr[0], size);
		_mixer->play_raw(NULL, Final, size, rate, SoundMixer::FLAG_UNSIGNED | SoundMixer::FLAG_AUTOFREE);
		free(CompFinal);
	}
}

void Scumm::playBundleSound(char *sound)
{
	if (!_sfxFile) {
		warning("playBundleSound: SFX file is not open");
		return;
	}

	for (int i=0; i < num_sound_effects; i++) {
		if (!scumm_stricmp(sound, bundle_table[i].filename)) {
			decompressBundleSound(i);
			return;
		}			
	} 

	warning("playBundleSound can't find %s", sound);
}

int Scumm::playSfxSound(void *sound, uint32 size, uint rate)
{
	if (_soundsPaused)
		return -1;
	return _mixer->play_raw(NULL, sound, size, rate, SoundMixer::FLAG_AUTOFREE);
}

int Scumm::playSfxSound_MP3(void *sound, uint32 size)
{
#ifdef COMPRESSED_SOUND_FILE
	if (_soundsPaused)
		return -1;
	return _mixer->play_mp3(NULL, sound, size, SoundMixer::FLAG_AUTOFREE);
#endif
	return -1;
}

#ifdef COMPRESSED_SOUND_FILE

int Scumm::getCachedTrack(int track) {
	int i;
	char track_name[1024];
	FILE* file;
	int current_index;
	struct mad_stream stream;
	struct mad_frame frame;
	unsigned char buffer[8192];
	unsigned int buflen = 0;
	int count = 0;

	// See if we find the track in the cache
	for (i=0; i<CACHE_TRACKS; i++)
		if (_cached_tracks[i] == track) {
			if (_mp3_tracks[i])
				return i;
			else
				return -1;
		}
	current_index = _current_cache++;
	_current_cache %= CACHE_TRACKS;
	// Not found, see if it exists
	sprintf(track_name, "%strack%d.mp3", _gameDataPath, track);
	file = fopen(track_name, "rb");
	_cached_tracks[current_index] = track;
	/* First, close the previous file */
	if (_mp3_tracks[current_index])
		fclose(_mp3_tracks[current_index]);
	_mp3_tracks[current_index] = NULL;
	if (!file) {
		// This warning is pretty pointless.
		debug(1, "Track %d not available in mp3 format", track);
		return -1;
	}
	// Check the format and bitrate
	mad_stream_init(&stream);
	mad_frame_init(&frame);

	while (1) {
		if (buflen < sizeof(buffer)) {
			int bytes;

			bytes = fread(buffer + buflen, 1, sizeof(buffer) - buflen, file);
			if (bytes <= 0) {
				if (bytes == -1) {
					warning("Invalid format for track %d", track);
					goto error;
				}
				break;
			}

			buflen += bytes;
		}

		mad_stream_buffer(&stream, buffer, buflen);

		while (1) {
			if (mad_frame_decode(&frame, &stream) == -1) {
				if (!MAD_RECOVERABLE(stream.error))
					break;

				if (stream.error != MAD_ERROR_BADCRC)
					continue;
			}

			if (count++)
				break;
		}

		if (count || stream.error != MAD_ERROR_BUFLEN)
			break;

		memmove(buffer, stream.next_frame,
		        buflen = &buffer[buflen] - stream.next_frame);
	}

	if (count)
		memcpy(&_mad_header[current_index], &frame.header, sizeof(mad_header));
	else {
		warning("Invalid format for track %d", track);
		goto error;
	}

	mad_frame_finish(&frame);
	mad_stream_finish(&stream);
	// Get file size
	fseek(file, 0, SEEK_END);
	_mp3_size[current_index] = ftell(file);
	_mp3_tracks[current_index] = file;
	
	return current_index;

 error:
	mad_frame_finish(&frame);
	mad_stream_finish(&stream);
	fclose(file);

	return -1;
}

int Scumm::playMP3CDTrack(int track, int num_loops, int start, int delay) {
	int index;
	unsigned int offset;
	mad_timer_t duration;

	g_scumm->_vars[g_scumm->VAR_MI1_TIMER] = 0;

	if (_soundsPaused)
		return 0;

	if ((num_loops == 0) && (start == 0)) {
		return 0;
	}

	index = getCachedTrack(track);
	if (index < 0)
		return -1;

	// Calc offset. As all bitrates are in kilobit per seconds, the division by 200 is always exact
	offset = (start * (_mad_header[index].bitrate / (8 * 25))) / 3;

	// Calc delay
	if (!delay) {
		mad_timer_set(&duration, (_mp3_size[index] * 8) / _mad_header[index].bitrate,
		              (_mp3_size[index] * 8) % _mad_header[index].bitrate, _mad_header[index].bitrate);
	} else {
		mad_timer_set(&duration, delay / 75, delay % 75, 75);
	}	

	// Go
	fseek(_mp3_tracks[index], offset, SEEK_SET);

	if (_mp3_cd_playing == true)
		_mixer->stop(_mp3_index);		
	_mp3_index = _mixer->play_mp3_cdtrack(NULL, _mp3_tracks[index], duration);
	_mp3_cd_playing = true;
	return 0;
}

int Scumm::stopMP3CD() {
	if (_mp3_cd_playing == true) {
		_mixer->stop(_mp3_index);
		_mp3_cd_playing = false;
		return 0;
	}
	return -1;
}

int Scumm::pollMP3CD() {
	if (_mp3_cd_playing == true)
		return 1;
	return 0;
}

int Scumm::updateMP3CD() {
	if (_mp3_cd_playing == false)
		return -1;

	if (_mixer->_channels[_mp3_index] == NULL) {
		warning("Error in MP3 decoding");
		return -1;
	}

	if (_mixer->_channels[_mp3_index]->sound_finished())
		stopMP3CD();
	return 0;
}
#endif