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/*

Copyright (C) 1996-1997 Id Software, Inc.

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.

*/

// snd_mem.c: sound caching

#include "quakedef.h"

int			cache_full_cycle;

byte *S_Alloc (int size);

/*

================

ResampleSfx

================

*/

void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)

{

	int		outcount;

	int		srcsample;

	float	stepscale;

	int		i;

	int		sample, samplefrac, fracstep;

	sfxcache_t	*sc;

	sc = Cache_Check (&sfx->cache);

	if (!sc)

		return;

	stepscale = (float)inrate / shm->speed;	// this is usually 0.5, 1, or 2

	outcount = sc->length / stepscale;

	sc->length = outcount;

	if (sc->loopstart != -1)

		sc->loopstart = sc->loopstart / stepscale;

	sc->speed = shm->speed;

	if (loadas8bit.value)

		sc->width = 1;

	else

		sc->width = inwidth;

	sc->stereo = 0;

// resample / decimate to the current source rate

	if (stepscale == 1 && inwidth == 1 && sc->width == 1)

	{

// fast special case

		for (i=0 ; i

			((signed char *)sc->data)[i]

			= (int)( (unsigned char)(data[i]) - 128);

	}

	else

	{

// general case

		samplefrac = 0;

		fracstep = stepscale*256;

		for (i=0 ; i

		{

			srcsample = samplefrac >> 8;

			samplefrac += fracstep;

			if (inwidth == 2)

				sample = LittleShort ( ((short *)data)[srcsample] );

			else

				sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;

			if (sc->width == 2)

				((short *)sc->data)[i] = sample;

			else

				((signed char *)sc->data)[i] = sample >> 8;

		}

	}

}

//=============================================================================

/*

==============

S_LoadSound

==============

*/

sfxcache_t *S_LoadSound (sfx_t *s)

{

    char	namebuffer[256];

	byte	*data;

	wavinfo_t	info;

	int		len;

	float	stepscale;

	sfxcache_t	*sc;

	byte	stackbuf[1*1024];		// avoid dirtying the cache heap

// see if still in memory

	sc = Cache_Check (&s->cache);

	if (sc)

		return sc;

//Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);

// load it in

    Q_strcpy(namebuffer, "sound/");

    Q_strcat(namebuffer, s->name);

//	Con_Printf ("loading %s\n",namebuffer);

	data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf));

	if (!data)

	{

		Con_Printf ("Couldn't load %s\n", namebuffer);

		return NULL;

	}

	info = GetWavinfo (s->name, data, com_filesize);

	if (info.channels != 1)

	{

		Con_Printf ("%s is a stereo sample\n",s->name);

		return NULL;

	}

	stepscale = (float)info.rate / shm->speed;

	len = info.samples / stepscale;

	len = len * info.width * info.channels;

	sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);

	if (!sc)

		return NULL;

	sc->length = info.samples;

	sc->loopstart = info.loopstart;

	sc->speed = info.rate;

	sc->width = info.width;

	sc->stereo = info.channels;

	ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);

	return sc;

}

/*

===============================================================================

WAV loading

===============================================================================

*/

byte	*data_p;

byte 	*iff_end;

byte 	*last_chunk;

byte 	*iff_data;

int 	iff_chunk_len;

short GetLittleShort(void)

{

	short val = 0;

	val = *data_p;

	val = val + (*(data_p+1)<<8);

	data_p += 2;

	return val;

}

int GetLittleLong(void)

{

	int val = 0;

	val = *data_p;

	val = val + (*(data_p+1)<<8);

	val = val + (*(data_p+2)<<16);

	val = val + (*(data_p+3)<<24);

	data_p += 4;

	return val;

}

void FindNextChunk(char *name)

{

	while (1)

	{

		data_p=last_chunk;

		if (data_p >= iff_end)

		{	// didn't find the chunk

			data_p = NULL;

			return;

		}

		data_p += 4;

		iff_chunk_len = GetLittleLong();

		if (iff_chunk_len < 0)

		{

			data_p = NULL;

			return;

		}

//		if (iff_chunk_len > 1024*1024)

//			Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);

		data_p -= 8;

		last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );

		if (!Q_strncmp(data_p, name, 4))

			return;

	}

}

void FindChunk(char *name)

{

	last_chunk = iff_data;

	FindNextChunk (name);

}

void DumpChunks(void)

{

	char	str[5];

	str[4] = 0;

	data_p=iff_data;

	do

	{

		memcpy (str, data_p, 4);

		data_p += 4;

		iff_chunk_len = GetLittleLong();

		Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);

		data_p += (iff_chunk_len + 1) & ~1;

	} while (data_p < iff_end);

}

/*

============

GetWavinfo

============

*/

wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)

{

	wavinfo_t	info;

	int     i;

	int     format;

	int		samples;

	memset (&info, 0, sizeof(info));

	if (!wav)

		return info;

	iff_data = wav;

	iff_end = wav + wavlength;

// find "RIFF" chunk

	FindChunk("RIFF");

	if (!(data_p && !Q_strncmp(data_p+8, "WAVE", 4)))

	{

		Con_Printf("Missing RIFF/WAVE chunks\n");

		return info;

	}

// get "fmt " chunk

	iff_data = data_p + 12;

// DumpChunks ();

	FindChunk("fmt ");

	if (!data_p)

	{

		Con_Printf("Missing fmt chunk\n");

		return info;

	}

	data_p += 8;

	format = GetLittleShort();

	if (format != 1)

	{

		Con_Printf("Microsoft PCM format only\n");

		return info;

	}

	info.channels = GetLittleShort();

	info.rate = GetLittleLong();

	data_p += 4+2;

	info.width = GetLittleShort() / 8;

// get cue chunk

	FindChunk("cue ");

	if (data_p)

	{

		data_p += 32;

		info.loopstart = GetLittleLong();

//		Con_Printf("loopstart=%d\n", sfx->loopstart);

	// if the next chunk is a LIST chunk, look for a cue length marker

		FindNextChunk ("LIST");

		if (data_p)

		{

			if (!strncmp (data_p + 28, "mark", 4))

			{	// this is not a proper parse, but it works with cooledit...

				data_p += 24;

				i = GetLittleLong ();	// samples in loop

				info.samples = info.loopstart + i;

//				Con_Printf("looped length: %i\n", i);

			}

		}

	}

	else

		info.loopstart = -1;

// find data chunk

	FindChunk("data");

	if (!data_p)

	{

		Con_Printf("Missing data chunk\n");

		return info;

	}

	data_p += 4;

	samples = GetLittleLong () / info.width;

	if (info.samples)

	{

		if (samples < info.samples)

			Sys_Error ("Sound %s has a bad loop length", name);

	}

	else

		info.samples = samples;

	info.dataofs = data_p - wav;

	return info;

}