samples/quake/jni/snd_mem.cpp - platform/gdk - Git at Google

 /*
 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 = (sfxcache_t*) Cache_Check (&sfx->cache);
 	if (!sc)
 		return;

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

 	outcount = (int) (sc->length / stepscale);
 	sc->length = outcount;
 	if (sc->loopstart != -1)
 		sc->loopstart = (int) (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<outcount ; i++)
 			sc->data.sc[i]
 			= (int)( (unsigned char)(data[i]) - 128);
 	}
 	else
 	{
 // general case
 		samplefrac = 0;
 		fracstep = (int) (stepscale*256);
 		for (i=0 ; i<outcount ; 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)
 				sc->data.s[i] = sample;
 			else
 				sc->data.sc[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 = (sfxcache_t*) 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 = (int) (info.samples / stepscale);

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

 	sc = (sfxcache_t*) 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(const 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((char*) data_p, name, 4))
 			return;
 	}
 }

 void FindChunk(const 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((char*) (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 ((char*) (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;
 }
	/*
	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 = (sfxcache_t*) Cache_Check (&sfx->cache);
	if (!sc)
	return;

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

	outcount = (int) (sc->length / stepscale);
	sc->length = outcount;
	if (sc->loopstart != -1)
	sc->loopstart = (int) (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<outcount ; i++)
	sc->data.sc[i]
	= (int)( (unsigned char)(data[i]) - 128);
	}
	else
	{
	// general case
	samplefrac = 0;
	fracstep = (int) (stepscale*256);
	for (i=0 ; i<outcount ; 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)
	sc->data.s[i] = sample;
	else
	sc->data.sc[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 = (sfxcache_t*) 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 = (int) (info.samples / stepscale);

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

	sc = (sfxcache_t*) 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(const 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((char*) data_p, name, 4))
	return;
	}
	}

	void FindChunk(const 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((char*) (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 ((char*) (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;
	}