333 lines
6.9 KiB
C
333 lines
6.9 KiB
C
/*
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Copyright (C) 1996-2001 Id Software, Inc.
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Copyright (C) 2010-2011 O. Sezer <sezero@users.sourceforge.net>
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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 "q_defs.h"
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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 ResampleSfx(sfx_t *sfx, int32_t inrate, int32_t inwidth, byte *data)
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{
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int32_t outcount;
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int32_t srcsample;
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float stepscale;
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int32_t i;
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int32_t sample, samplefrac, fracstep;
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sfxcache_t *sc;
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sc = (sfxcache_t *) 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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{
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// fast special case
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for(i = 0; i < outcount; i++)
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((int8_t *)sc->data)[i] = (int32_t)((uint8_t)(data[i]) - 128);
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}
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else
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{
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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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{
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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(((int16_t *)data)[srcsample]);
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else
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sample = (int32_t)((uint8_t)(data[srcsample]) - 128) << 8;
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if(sc->width == 2)
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((int16_t *)sc->data)[i] = sample;
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else
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((int8_t *)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 *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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int32_t len;
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float stepscale;
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sfxcache_t *sc;
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byte stackbuf[1 * 1024]; // avoid dirtying the cache heap
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// see if still in memory
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sc = (sfxcache_t *) 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", (int32_t)stackbuf);
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// load it in
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q_strlcpy(namebuffer, "sound/", sizeof(namebuffer));
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q_strlcat(namebuffer, s->name, sizeof(namebuffer));
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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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{
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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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{
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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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if(info.width != 1 && info.width != 2)
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{
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Con_Printf("%s is not 8 or 16 bit\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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if(info.samples == 0 || len == 0)
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{
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Con_Printf("%s has zero samples\n", s->name);
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return NULL;
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}
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sc = (sfxcache_t *) 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 byte *data_p;
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static byte *iff_end;
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static byte *last_chunk;
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static byte *iff_data;
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static int32_t iff_chunk_len;
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static int16_t GetLittleShort(void)
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{
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int16_t 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 int32_t GetLittleLong(void)
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{
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int32_t 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 FindNextChunk(const char *name)
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{
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while(1)
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{
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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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{
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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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{
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data_p = NULL;
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Con_DPrintf2("bad \"%s\" chunk length (%" PRIi32 ")\n", name, iff_chunk_len);
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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((char *)data_p, name, 4))
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return;
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}
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}
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static void FindChunk(const char *name)
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{
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last_chunk = iff_data;
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FindNextChunk(name);
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}
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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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wavinfo_t GetWavinfo(const char *name, byte *wav, int32_t wavlength)
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{
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wavinfo_t info;
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int32_t i;
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int32_t format;
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int32_t 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");
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if(!(data_p && !strncmp((char *)data_p + 8, "WAVE", 4)))
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{
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Con_Printf("%s missing RIFF/WAVE chunks\n", name);
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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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FindChunk("fmt ");
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if(!data_p)
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{
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Con_Printf("%s is missing fmt chunk\n", name);
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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 != WAV_FORMAT_PCM)
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{
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Con_Printf("%s is not Microsoft PCM format\n", name);
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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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i = GetLittleShort();
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if(i != 8 && i != 16)
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return info;
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info.width = i / 8;
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// get cue chunk
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FindChunk("cue ");
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if(data_p)
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{
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data_p += 32;
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info.loopstart = GetLittleLong();
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// Con_Printf("loopstart=%" PRIi32 "\n", sfx->loopstart);
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// if the next chunk is a LIST chunk, look for a cue length marker
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FindNextChunk("LIST");
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if(data_p)
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{
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if(!strncmp((char *)data_p + 28, "mark", 4))
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{
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// this is not a proper parse, but it works with cooledit...
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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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// Con_Printf("looped length: %" PRIi32 "\n", i);
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}
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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");
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if(!data_p)
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{
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Con_Printf("%s is missing data chunk\n", name);
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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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{
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if(samples < info.samples)
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Sys_Error("%s has a bad loop length", name);
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}
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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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