2 Copyright (C) 1996-1997 Id Software, Inc.
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 See the GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 // snd_mem.c: sound caching
26 byte *S_Alloc (int size);
33 void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
39 int samplefrac, fracstep;
42 sc = Cache_Check (&sfx->cache);
46 stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2
48 outcount = sc->length / stepscale;
49 sc->length = outcount;
50 if (sc->loopstart != -1)
51 sc->loopstart = sc->loopstart / stepscale;
53 sc->speed = shm->speed;
60 // resample / decimate to the current source rate
62 if (stepscale == 1 && inwidth == 1 && sc->width == 1)
65 // LordHavoc: I do not serve the readability gods...
66 int *indata, *outdata;
68 count1 = outcount << sc->stereo;
70 indata = (void *)data;
71 outdata = (void *)sc->data;
73 *outdata++ = *indata++ ^ 0x80808080;
75 ((short*)outdata)[0] = ((short*)indata)[0] ^ 0x8080;
77 ((char*)outdata)[2] = ((char*)indata)[2] ^ 0x80;
79 if (sc->stereo) // LordHavoc: stereo sound support
81 for (i=0 ; i<(outcount<<1) ; i++)
82 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
86 for (i=0 ; i<outcount ; i++)
87 ((signed char *)sc->data)[i] = (int)( (unsigned char)(data[i]) - 128);
94 Con_DPrintf("ResampleSfx: resampling sound %s\n", sfx->name);
96 fracstep = stepscale*256;
97 if (sc->stereo) // LordHavoc: stereo sound support
101 for (i=0 ; i<outcount*2 ;)
103 srcsample = samplefrac >> 8;
104 samplefrac += fracstep;
106 ((short *)sc->data)[i++] = LittleShort ( ((short *)data)[srcsample++] ); // left
107 ((short *)sc->data)[i++] = LittleShort ( ((short *)data)[srcsample ] ); // right
112 for (i=0 ; i<outcount*2 ;)
114 srcsample = samplefrac >> 8;
115 samplefrac += fracstep;
117 ((signed char *)sc->data)[i++] = ((int)( (unsigned char)(data[srcsample++]) - 128) << 8) >> 8; // left
118 ((signed char *)sc->data)[i++] = ((int)( (unsigned char)(data[srcsample ]) - 128) << 8) >> 8; // right
126 for (i=0 ; i<outcount ; i++)
128 srcsample = samplefrac >> 8;
129 samplefrac += fracstep;
130 ((short *)sc->data)[i] = LittleShort ( ((short *)data)[srcsample] );
135 for (i=0 ; i<outcount ; i++)
137 srcsample = samplefrac >> 8;
138 samplefrac += fracstep;
139 ((signed char *)sc->data)[i] = ((int)( (unsigned char)(data[srcsample]) - 128) << 8) >> 8;
146 //=============================================================================
153 sfxcache_t *S_LoadSound (sfx_t *s)
155 char namebuffer[256];
161 byte stackbuf[1*1024]; // avoid dirtying the cache heap
163 // see if still in memory
164 sc = Cache_Check (&s->cache);
168 //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf);
170 strcpy(namebuffer, "sound/");
171 strcat(namebuffer, s->name);
173 // Con_Printf ("loading %s\n",namebuffer);
175 data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf), false);
179 Con_Printf ("Couldn't load %s\n", namebuffer);
183 info = GetWavinfo (s->name, data, com_filesize);
184 // LordHavoc: stereo sounds are now allowed (intended for music)
185 if (info.channels < 1 || info.channels > 2)
187 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
191 if (info.channels != 1)
193 Con_Printf ("%s is a stereo sample\n",s->name);
198 stepscale = (float)info.rate / shm->speed;
199 len = info.samples / stepscale;
201 len = len * info.width * info.channels;
203 sc = Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name);
207 sc->length = info.samples;
208 sc->loopstart = info.loopstart;
209 sc->speed = info.rate;
210 sc->width = info.width;
211 sc->stereo = info.channels == 2;
213 ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);
221 ===============================================================================
225 ===============================================================================
236 short GetLittleShort(void)
240 val = val + (*(data_p+1)<<8);
245 int GetLittleLong(void)
249 val = val + (*(data_p+1)<<8);
250 val = val + (*(data_p+2)<<16);
251 val = val + (*(data_p+3)<<24);
256 void FindNextChunk(char *name)
262 if (data_p >= iff_end)
263 { // didn't find the chunk
269 iff_chunk_len = GetLittleLong();
270 if (iff_chunk_len < 0)
275 // if (iff_chunk_len > 1024*1024)
276 // Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
278 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
279 if (!strncmp(data_p, name, 4))
284 void FindChunk(char *name)
286 last_chunk = iff_data;
287 FindNextChunk (name);
291 void DumpChunks(void)
299 memcpy (str, data_p, 4);
301 iff_chunk_len = GetLittleLong();
302 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
303 data_p += (iff_chunk_len + 1) & ~1;
304 } while (data_p < iff_end);
312 wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
319 memset (&info, 0, sizeof(info));
325 iff_end = wav + wavlength;
329 if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
331 Con_Printf("Missing RIFF/WAVE chunks\n");
336 iff_data = data_p + 12;
342 Con_Printf("Missing fmt chunk\n");
346 format = GetLittleShort();
349 Con_Printf("Microsoft PCM format only\n");
353 info.channels = GetLittleShort();
354 info.rate = GetLittleLong();
356 info.width = GetLittleShort() / 8;
363 info.loopstart = GetLittleLong();
364 // Con_Printf("loopstart=%d\n", sfx->loopstart);
366 // if the next chunk is a LIST chunk, look for a cue length marker
367 FindNextChunk ("LIST");
370 if (!strncmp (data_p + 28, "mark", 4))
371 { // this is not a proper parse, but it works with cooledit...
373 i = GetLittleLong (); // samples in loop
374 info.samples = info.loopstart + i;
375 // Con_Printf("looped length: %i\n", i);
386 Con_Printf("Missing data chunk\n");
391 samples = GetLittleLong () / info.width;
395 if (samples < info.samples)
396 Host_Error ("Sound %s has a bad loop length", name);
399 info.samples = samples;
401 info.dataofs = data_p - wav;