a prototype for the long dead function S_Alloc removed (thanks to Vic for mentioning...
[xonotic/darkplaces.git] / snd_mem.c
1 /*
2 Copyright (C) 1996-1997 Id Software, Inc.
3
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.
8
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.
12
13 See the GNU General Public License for more details.
14
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.
18
19 */
20 // snd_mem.c: sound caching
21
22 #include "quakedef.h"
23
24 /*
25 ================
26 ResampleSfx
27 ================
28 */
29 void ResampleSfx (sfxcache_t *sc, qbyte *data, char *name)
30 {
31         int i, outcount, srcsample, srclength, samplefrac, fracstep;
32
33         // this is usually 0.5 (128), 1 (256), or 2 (512)
34         fracstep = ((double) sc->speed / (double) shm->speed) * 256.0;
35
36         srclength = sc->length << sc->stereo;
37
38         outcount = (double) sc->length * (double) shm->speed / (double) sc->speed;
39         sc->length = outcount;
40         if (sc->loopstart != -1)
41                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
42
43         sc->speed = shm->speed;
44
45 // resample / decimate to the current source rate
46
47         if (fracstep == 256)
48         {
49                 // fast case for direct transfer
50                 if (sc->width == 1) // 8bit
51                         for (i = 0;i < srclength;i++)
52                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
53                 else //if (sc->width == 2) // 16bit
54                         for (i = 0;i < srclength;i++)
55                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
56         }
57         else
58         {
59                 // general case
60                 Con_DPrintf("ResampleSfx: resampling sound %s\n", name);
61                 samplefrac = 0;
62                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
63                 {
64                         srcsample = 0;
65                         fracstep >>= 8;
66                         if (sc->width == 2)
67                         {
68                                 short *out = (void *)sc->data, *in = (void *)data;
69                                 if (sc->stereo) // LordHavoc: stereo sound support
70                                 {
71                                         fracstep <<= 1;
72                                         for (i=0 ; i<outcount ; i++)
73                                         {
74                                                 *out++ = LittleShort (in[srcsample  ]);
75                                                 *out++ = LittleShort (in[srcsample+1]);
76                                                 srcsample += fracstep;
77                                         }
78                                 }
79                                 else
80                                 {
81                                         for (i=0 ; i<outcount ; i++)
82                                         {
83                                                 *out++ = LittleShort (in[srcsample  ]);
84                                                 srcsample += fracstep;
85                                         }
86                                 }
87                         }
88                         else
89                         {
90                                 signed char *out = (void *)sc->data;
91                                 unsigned char *in = (void *)data;
92                                 if (sc->stereo) // LordHavoc: stereo sound support
93                                 {
94                                         fracstep <<= 1;
95                                         for (i=0 ; i<outcount ; i++)
96                                         {
97                                                 *out++ = in[srcsample  ] - 128;
98                                                 *out++ = in[srcsample+1] - 128;
99                                                 srcsample += fracstep;
100                                         }
101                                 }
102                                 else
103                                 {
104                                         for (i=0 ; i<outcount ; i++)
105                                         {
106                                                 *out++ = in[srcsample  ] - 128;
107                                                 srcsample += fracstep;
108                                         }
109                                 }
110                         }
111                 }
112                 else
113                 {
114                         int sample;
115                         int a, b;
116                         if (sc->width == 2)
117                         {
118                                 short *out = (void *)sc->data, *in = (void *)data;
119                                 if (sc->stereo) // LordHavoc: stereo sound support
120                                 {
121                                         for (i=0 ; i<outcount ; i++)
122                                         {
123                                                 srcsample = (samplefrac >> 8) << 1;
124                                                 a = in[srcsample  ];
125                                                 if (srcsample+2 >= srclength)
126                                                         b = 0;
127                                                 else
128                                                         b = in[srcsample+2];
129                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
130                                                 *out++ = (short) sample;
131                                                 a = in[srcsample+1];
132                                                 if (srcsample+2 >= srclength)
133                                                         b = 0;
134                                                 else
135                                                         b = in[srcsample+3];
136                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
137                                                 *out++ = (short) sample;
138                                                 samplefrac += fracstep;
139                                         }
140                                 }
141                                 else
142                                 {
143                                         for (i=0 ; i<outcount ; i++)
144                                         {
145                                                 srcsample = samplefrac >> 8;
146                                                 a = in[srcsample  ];
147                                                 if (srcsample+1 >= srclength)
148                                                         b = 0;
149                                                 else
150                                                         b = in[srcsample+1];
151                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
152                                                 *out++ = (short) sample;
153                                                 samplefrac += fracstep;
154                                         }
155                                 }
156                         }
157                         else
158                         {
159                                 signed char *out = (void *)sc->data;
160                                 unsigned char *in = (void *)data;
161                                 if (sc->stereo) // LordHavoc: stereo sound support
162                                 {
163                                         for (i=0 ; i<outcount ; i++)
164                                         {
165                                                 srcsample = (samplefrac >> 8) << 1;
166                                                 a = (int) in[srcsample  ] - 128;
167                                                 if (srcsample+2 >= srclength)
168                                                         b = 0;
169                                                 else
170                                                         b = (int) in[srcsample+2] - 128;
171                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
172                                                 *out++ = (signed char) sample;
173                                                 a = (int) in[srcsample+1] - 128;
174                                                 if (srcsample+2 >= srclength)
175                                                         b = 0;
176                                                 else
177                                                         b = (int) in[srcsample+3] - 128;
178                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
179                                                 *out++ = (signed char) sample;
180                                                 samplefrac += fracstep;
181                                         }
182                                 }
183                                 else
184                                 {
185                                         for (i=0 ; i<outcount ; i++)
186                                         {
187                                                 srcsample = samplefrac >> 8;
188                                                 a = (int) in[srcsample  ] - 128;
189                                                 if (srcsample+1 >= srclength)
190                                                         b = 0;
191                                                 else
192                                                         b = (int) in[srcsample+1] - 128;
193                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
194                                                 *out++ = (signed char) sample;
195                                                 samplefrac += fracstep;
196                                         }
197                                 }
198                         }
199                 }
200         }
201
202         // LordHavoc: use this for testing if it ever becomes useful again
203         //COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
204 }
205
206 //=============================================================================
207
208 /*
209 ==============
210 S_LoadSound
211 ==============
212 */
213 sfxcache_t *S_LoadSound (sfx_t *s, int complain)
214 {
215     char namebuffer[256];
216         qbyte *data;
217         wavinfo_t info;
218         int len;
219         sfxcache_t *sc;
220
221         // see if still in memory
222         if (s->sfxcache)
223                 return s->sfxcache;
224
225         // load it in
226         strcpy(namebuffer, "sound/");
227         strcat(namebuffer, s->name);
228
229         data = FS_LoadFile(namebuffer, false);
230
231         if (!data)
232         {
233                 s->silentlymissing = !complain;
234                 if (complain)
235                         Con_Printf ("Couldn't load %s\n", namebuffer);
236                 return NULL;
237         }
238
239         info = GetWavinfo (s->name, data, fs_filesize);
240         // LordHavoc: stereo sounds are now allowed (intended for music)
241         if (info.channels < 1 || info.channels > 2)
242         {
243                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
244                 Mem_Free(data);
245                 return NULL;
246         }
247
248         // calculate resampled length
249         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
250         len = len * info.width * info.channels;
251
252         // FIXME: add S_UnloadSounds or something?
253         Mem_FreePool(&s->mempool);
254         s->mempool = Mem_AllocPool(s->name);
255         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
256         if (!sc)
257         {
258                 Mem_FreePool(&s->mempool);
259                 Mem_Free(data);
260                 return NULL;
261         }
262
263         sc->length = info.samples;
264         sc->loopstart = info.loopstart;
265         sc->speed = info.rate;
266         sc->width = info.width;
267         sc->stereo = info.channels == 2;
268
269         ResampleSfx (sc, data + info.dataofs, s->name);
270
271         Mem_Free(data);
272         return sc;
273 }
274
275
276
277 /*
278 ===============================================================================
279
280 WAV loading
281
282 ===============================================================================
283 */
284
285
286 qbyte *data_p;
287 qbyte *iff_end;
288 qbyte *last_chunk;
289 qbyte *iff_data;
290 int iff_chunk_len;
291
292
293 short GetLittleShort(void)
294 {
295         short val = 0;
296         val = *data_p;
297         val = val + (*(data_p+1)<<8);
298         data_p += 2;
299         return val;
300 }
301
302 int GetLittleLong(void)
303 {
304         int val = 0;
305         val = *data_p;
306         val = val + (*(data_p+1)<<8);
307         val = val + (*(data_p+2)<<16);
308         val = val + (*(data_p+3)<<24);
309         data_p += 4;
310         return val;
311 }
312
313 void FindNextChunk(char *name)
314 {
315         while (1)
316         {
317                 data_p=last_chunk;
318
319                 if (data_p >= iff_end)
320                 {       // didn't find the chunk
321                         data_p = NULL;
322                         return;
323                 }
324
325                 data_p += 4;
326                 iff_chunk_len = GetLittleLong();
327                 if (iff_chunk_len < 0)
328                 {
329                         data_p = NULL;
330                         return;
331                 }
332                 data_p -= 8;
333                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
334                 if (!strncmp(data_p, name, 4))
335                         return;
336         }
337 }
338
339 void FindChunk(char *name)
340 {
341         last_chunk = iff_data;
342         FindNextChunk (name);
343 }
344
345
346 void DumpChunks(void)
347 {
348         char str[5];
349
350         str[4] = 0;
351         data_p=iff_data;
352         do
353         {
354                 memcpy (str, data_p, 4);
355                 data_p += 4;
356                 iff_chunk_len = GetLittleLong();
357                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
358                 data_p += (iff_chunk_len + 1) & ~1;
359         } while (data_p < iff_end);
360 }
361
362 /*
363 ============
364 GetWavinfo
365 ============
366 */
367 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
368 {
369         wavinfo_t info;
370         int i;
371         int format;
372         int samples;
373
374         memset (&info, 0, sizeof(info));
375
376         if (!wav)
377                 return info;
378
379         iff_data = wav;
380         iff_end = wav + wavlength;
381
382         // find "RIFF" chunk
383         FindChunk("RIFF");
384         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
385         {
386                 Con_Printf("Missing RIFF/WAVE chunks\n");
387                 return info;
388         }
389
390         // get "fmt " chunk
391         iff_data = data_p + 12;
392         //DumpChunks ();
393
394         FindChunk("fmt ");
395         if (!data_p)
396         {
397                 Con_Printf("Missing fmt chunk\n");
398                 return info;
399         }
400         data_p += 8;
401         format = GetLittleShort();
402         if (format != 1)
403         {
404                 Con_Printf("Microsoft PCM format only\n");
405                 return info;
406         }
407
408         info.channels = GetLittleShort();
409         info.rate = GetLittleLong();
410         data_p += 4+2;
411         info.width = GetLittleShort() / 8;
412
413         // get cue chunk
414         FindChunk("cue ");
415         if (data_p)
416         {
417                 data_p += 32;
418                 info.loopstart = GetLittleLong();
419
420                 // if the next chunk is a LIST chunk, look for a cue length marker
421                 FindNextChunk ("LIST");
422                 if (data_p)
423                 {
424                         if (!strncmp (data_p + 28, "mark", 4))
425                         {       // this is not a proper parse, but it works with cooledit...
426                                 data_p += 24;
427                                 i = GetLittleLong ();   // samples in loop
428                                 info.samples = info.loopstart + i;
429                         }
430                 }
431         }
432         else
433                 info.loopstart = -1;
434
435         // find data chunk
436         FindChunk("data");
437         if (!data_p)
438         {
439                 Con_Printf("Missing data chunk\n");
440                 return info;
441         }
442
443         data_p += 4;
444         samples = GetLittleLong () / info.width / info.channels;
445
446         if (info.samples)
447         {
448                 if (samples < info.samples)
449                         Host_Error ("Sound %s has a bad loop length", name);
450         }
451         else
452                 info.samples = samples;
453
454         info.dataofs = data_p - wav;
455
456         return info;
457 }
458