mirror of
https://github.com/libretro/libretro-tyrquake.git
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340 lines
7.2 KiB
C
340 lines
7.2 KiB
C
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// snd_mem.c: sound caching
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#include "common.h"
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#include "console.h"
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#include "quakedef.h"
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#include "sound.h"
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#include "sys.h"
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typedef struct {
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int rate;
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int width;
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int channels;
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int loopstart;
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int samples;
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int dataofs; // chunk starts this many bytes from file start
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} wavinfo_t;
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static wavinfo_t *GetWavinfo(const char *name, const byte *wav, int wavlength);
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/*
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================
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ResampleSfx
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================
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*/
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static void
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ResampleSfx(sfx_t *sfx, int inrate, int inwidth, const byte *data)
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{
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int outcount;
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int srcsample;
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float stepscale;
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int i;
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int sample, samplefrac, fracstep;
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sfxcache_t *sc;
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sc = Cache_Check(&sfx->cache);
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if (!sc)
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return;
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stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2
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outcount = sc->length / stepscale;
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sc->length = outcount;
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if (sc->loopstart != -1)
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sc->loopstart = sc->loopstart / stepscale;
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sc->speed = shm->speed;
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if (loadas8bit.value)
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sc->width = 1;
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else
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sc->width = inwidth;
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sc->stereo = 0;
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// resample / decimate to the current source rate
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if (stepscale == 1 && inwidth == 1 && sc->width == 1) {
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// fast special case
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for (i = 0; i < outcount; i++)
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((signed char *)sc->data)[i]
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= (int)((unsigned char)(data[i]) - 128);
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} else {
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// general case
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samplefrac = 0;
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fracstep = stepscale * 256;
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for (i = 0; i < outcount; i++) {
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srcsample = samplefrac >> 8;
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samplefrac += fracstep;
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if (inwidth == 2)
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sample = LittleShort(((const short *)data)[srcsample]);
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else
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sample = (int)((unsigned char)(data[srcsample]) - 128) << 8;
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if (sc->width == 2)
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((short *)sc->data)[i] = sample;
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else
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((signed char *)sc->data)[i] = sample >> 8;
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}
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}
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}
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//=============================================================================
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/*
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==============
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S_LoadSound
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==============
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*/
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sfxcache_t *
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S_LoadSound(sfx_t *s)
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{
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char namebuffer[256];
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byte *data;
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wavinfo_t *info;
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int len;
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float stepscale;
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sfxcache_t *sc;
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byte stackbuf[1024]; // avoid dirtying the cache heap
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// see if still in memory
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sc = Cache_Check(&s->cache);
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if (sc)
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return sc;
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//Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
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// load it in
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strcpy(namebuffer, "sound/");
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strcat(namebuffer, s->name);
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// Con_Printf ("loading %s\n",namebuffer);
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data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf), NULL);
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if (!data) {
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Con_Printf("Couldn't load %s\n", namebuffer);
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return NULL;
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}
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info = GetWavinfo(s->name, data, com_filesize);
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if (info->channels != 1) {
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Con_Printf("%s is a stereo sample\n", s->name);
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return NULL;
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}
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stepscale = (float)info->rate / shm->speed;
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len = info->samples / stepscale;
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len = len * info->width * info->channels;
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sc = Cache_Alloc(&s->cache, len + sizeof(sfxcache_t), s->name);
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if (!sc)
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return NULL;
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sc->length = info->samples;
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sc->loopstart = info->loopstart;
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sc->speed = info->rate;
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sc->width = info->width;
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sc->stereo = info->channels;
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ResampleSfx(s, sc->speed, sc->width, data + info->dataofs);
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return sc;
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}
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/*
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===============================================================================
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WAV loading
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===============================================================================
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*/
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static const byte *data_p;
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static const byte *iff_end;
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static const byte *last_chunk;
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static const byte *iff_data;
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static int iff_chunk_len;
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static short
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GetLittleShort(void)
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{
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short val = 0;
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val = *data_p;
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val = val + (*(data_p + 1) << 8);
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data_p += 2;
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return val;
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}
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static int
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GetLittleLong(void)
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{
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int val = 0;
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val = *data_p;
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val = val + (*(data_p + 1) << 8);
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val = val + (*(data_p + 2) << 16);
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val = val + (*(data_p + 3) << 24);
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data_p += 4;
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return val;
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}
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static void
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FindNextChunk(const char *name, const char *filename)
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{
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while (1) {
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/* Need at least 8 bytes for a chunk */
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if (last_chunk + 8 >= iff_end) {
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data_p = NULL;
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return;
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}
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data_p = last_chunk + 4;
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iff_chunk_len = GetLittleLong();
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if (iff_chunk_len < 0 || iff_chunk_len > iff_end - data_p) {
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Con_DPrintf("Bad \"%s\" chunk length (%d) in wav file %s\n",
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name, iff_chunk_len, filename);
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data_p = NULL;
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return;
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}
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last_chunk = data_p + ((iff_chunk_len + 1) & ~1);
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data_p -= 8;
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if (!strncmp((const char *)data_p, name, 4))
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return;
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}
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}
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static void
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FindChunk(const char *name, const char *filename)
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{
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last_chunk = iff_data;
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FindNextChunk(name, filename);
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}
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#if 0
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static void
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DumpChunks(void)
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{
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char str[5];
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str[4] = 0;
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data_p = iff_data;
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do {
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memcpy(str, data_p, 4);
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data_p += 4;
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iff_chunk_len = GetLittleLong();
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Con_Printf("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
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data_p += (iff_chunk_len + 1) & ~1;
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} while (data_p < iff_end);
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}
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#endif
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/*
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============
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GetWavinfo
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============
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*/
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static wavinfo_t *
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GetWavinfo(const char *name, const byte *wav, int wavlength)
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{
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static wavinfo_t info;
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int i;
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int format;
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int samples;
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memset(&info, 0, sizeof(info));
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if (!wav)
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return &info;
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iff_data = wav;
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iff_end = wav + wavlength;
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// find "RIFF" chunk
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FindChunk("RIFF", name);
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if (!(data_p && !strncmp((char *)data_p + 8, "WAVE", 4))) {
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Con_Printf("Missing RIFF/WAVE chunks\n");
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return &info;
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}
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// get "fmt " chunk
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iff_data = data_p + 12;
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// DumpChunks ();
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FindChunk("fmt ", name);
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if (!data_p) {
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Con_Printf("Missing fmt chunk\n");
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return &info;
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}
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data_p += 8;
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format = GetLittleShort();
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if (format != 1) {
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Con_Printf("Microsoft PCM format only\n");
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return &info;
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}
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info.channels = GetLittleShort();
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info.rate = GetLittleLong();
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data_p += 4 + 2;
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info.width = GetLittleShort() / 8;
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// get cue chunk
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FindChunk("cue ", name);
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if (data_p) {
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data_p += 32;
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info.loopstart = GetLittleLong();
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// if the next chunk is a LIST chunk, look for a cue length marker
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FindNextChunk("LIST", name);
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if (data_p) {
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/* this is not a proper parse, but it works with cooledit... */
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if (!strncmp((char *)data_p + 28, "mark", 4)) {
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data_p += 24;
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i = GetLittleLong(); // samples in loop
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info.samples = info.loopstart + i;
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}
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}
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} else
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info.loopstart = -1;
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// find data chunk
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FindChunk("data", name);
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if (!data_p) {
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Con_Printf("Missing data chunk\n");
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return &info;
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}
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data_p += 4;
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samples = GetLittleLong() / info.width;
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if (info.samples) {
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if (samples < info.samples)
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Sys_Error("Sound %s has a bad loop length", name);
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} else
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info.samples = samples;
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info.dataofs = data_p - wav;
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return &info;
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}
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