minor whitespace and comment cleanup
[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 qbyte *S_Alloc (int size);
25
26 /*
27 ================
28 ResampleSfx
29 ================
30 */
31 void ResampleSfx (sfxcache_t *sc, qbyte *data, char *name)
32 {
33         int i, outcount, srcsample, srclength, samplefrac, fracstep;
34
35         // this is usually 0.5 (128), 1 (256), or 2 (512)
36         fracstep = ((double) sc->speed / (double) shm->speed) * 256.0;
37
38         srclength = sc->length << sc->stereo;
39
40         outcount = (double) sc->length * (double) shm->speed / (double) sc->speed;
41         sc->length = outcount;
42         if (sc->loopstart != -1)
43                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
44
45         sc->speed = shm->speed;
46
47 // resample / decimate to the current source rate
48
49         if (fracstep == 256)
50         {
51                 // fast case for direct transfer
52                 if (sc->width == 1) // 8bit
53                         for (i = 0;i < srclength;i++)
54                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
55                 else //if (sc->width == 2) // 16bit
56                         for (i = 0;i < srclength;i++)
57                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
58         }
59         else
60         {
61                 // general case
62                 Con_DPrintf("ResampleSfx: resampling sound %s\n", name);
63                 samplefrac = 0;
64                 if ((fracstep & 255) == 0) // skipping points on perfect multiple
65                 {
66                         srcsample = 0;
67                         fracstep >>= 8;
68                         if (sc->width == 2)
69                         {
70                                 short *out = (void *)sc->data, *in = (void *)data;
71                                 if (sc->stereo) // LordHavoc: stereo sound support
72                                 {
73                                         fracstep <<= 1;
74                                         for (i=0 ; i<outcount ; i++)
75                                         {
76                                                 *out++ = LittleShort (in[srcsample  ]);
77                                                 *out++ = LittleShort (in[srcsample+1]);
78                                                 srcsample += fracstep;
79                                         }
80                                 }
81                                 else
82                                 {
83                                         for (i=0 ; i<outcount ; i++)
84                                         {
85                                                 *out++ = LittleShort (in[srcsample  ]);
86                                                 srcsample += fracstep;
87                                         }
88                                 }
89                         }
90                         else
91                         {
92                                 signed char *out = (void *)sc->data;
93                                 unsigned char *in = (void *)data;
94                                 if (sc->stereo) // LordHavoc: stereo sound support
95                                 {
96                                         fracstep <<= 1;
97                                         for (i=0 ; i<outcount ; i++)
98                                         {
99                                                 *out++ = in[srcsample  ] - 128;
100                                                 *out++ = in[srcsample+1] - 128;
101                                                 srcsample += fracstep;
102                                         }
103                                 }
104                                 else
105                                 {
106                                         for (i=0 ; i<outcount ; i++)
107                                         {
108                                                 *out++ = in[srcsample  ] - 128;
109                                                 srcsample += fracstep;
110                                         }
111                                 }
112                         }
113                 }
114                 else
115                 {
116                         int sample;
117                         int a, b;
118                         if (sc->width == 2)
119                         {
120                                 short *out = (void *)sc->data, *in = (void *)data;
121                                 if (sc->stereo) // LordHavoc: stereo sound support
122                                 {
123                                         for (i=0 ; i<outcount ; i++)
124                                         {
125                                                 srcsample = (samplefrac >> 8) << 1;
126                                                 a = in[srcsample  ];
127                                                 if (srcsample+2 >= srclength)
128                                                         b = 0;
129                                                 else
130                                                         b = in[srcsample+2];
131                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
132                                                 *out++ = (short) sample;
133                                                 a = in[srcsample+1];
134                                                 if (srcsample+2 >= srclength)
135                                                         b = 0;
136                                                 else
137                                                         b = in[srcsample+3];
138                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
139                                                 *out++ = (short) sample;
140                                                 samplefrac += fracstep;
141                                         }
142                                 }
143                                 else
144                                 {
145                                         for (i=0 ; i<outcount ; i++)
146                                         {
147                                                 srcsample = samplefrac >> 8;
148                                                 a = in[srcsample  ];
149                                                 if (srcsample+1 >= srclength)
150                                                         b = 0;
151                                                 else
152                                                         b = in[srcsample+1];
153                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
154                                                 *out++ = (short) sample;
155                                                 samplefrac += fracstep;
156                                         }
157                                 }
158                         }
159                         else
160                         {
161                                 signed char *out = (void *)sc->data;
162                                 unsigned char *in = (void *)data;
163                                 if (sc->stereo) // LordHavoc: stereo sound support
164                                 {
165                                         for (i=0 ; i<outcount ; i++)
166                                         {
167                                                 srcsample = (samplefrac >> 8) << 1;
168                                                 a = (int) in[srcsample  ] - 128;
169                                                 if (srcsample+2 >= srclength)
170                                                         b = 0;
171                                                 else
172                                                         b = (int) in[srcsample+2] - 128;
173                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
174                                                 *out++ = (signed char) sample;
175                                                 a = (int) in[srcsample+1] - 128;
176                                                 if (srcsample+2 >= srclength)
177                                                         b = 0;
178                                                 else
179                                                         b = (int) in[srcsample+3] - 128;
180                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
181                                                 *out++ = (signed char) sample;
182                                                 samplefrac += fracstep;
183                                         }
184                                 }
185                                 else
186                                 {
187                                         for (i=0 ; i<outcount ; i++)
188                                         {
189                                                 srcsample = samplefrac >> 8;
190                                                 a = (int) in[srcsample  ] - 128;
191                                                 if (srcsample+1 >= srclength)
192                                                         b = 0;
193                                                 else
194                                                         b = (int) in[srcsample+1] - 128;
195                                                 sample = (((b - a) * (samplefrac & 255)) >> 8) + a;
196                                                 *out++ = (signed char) sample;
197                                                 samplefrac += fracstep;
198                                         }
199                                 }
200                         }
201                 }
202         }
203
204         // LordHavoc: use this for testing if it ever becomes useful again
205         //COM_WriteFile (va("sound/%s.pcm", name), sc->data, (sc->length << sc->stereo) * sc->width);
206 }
207
208 //=============================================================================
209
210 /*
211 ==============
212 S_LoadSound
213 ==============
214 */
215 sfxcache_t *S_LoadSound (sfx_t *s, int complain)
216 {
217     char namebuffer[256];
218         qbyte *data;
219         wavinfo_t info;
220         int len;
221         sfxcache_t *sc;
222
223         // see if still in memory
224         if (s->sfxcache)
225                 return s->sfxcache;
226
227         // load it in
228         strcpy(namebuffer, "sound/");
229         strcat(namebuffer, s->name);
230
231         data = COM_LoadFile(namebuffer, false);
232
233         if (!data)
234         {
235                 if (complain)
236                         Con_Printf ("Couldn't load %s\n", namebuffer);
237                 return NULL;
238         }
239
240         info = GetWavinfo (s->name, data, com_filesize);
241         // LordHavoc: stereo sounds are now allowed (intended for music)
242         if (info.channels < 1 || info.channels > 2)
243         {
244                 Con_Printf ("%s has an unsupported number of channels (%i)\n",s->name, info.channels);
245                 Mem_Free(data);
246                 return NULL;
247         }
248
249         // calculate resampled length
250         len = (int) ((double) info.samples * (double) shm->speed / (double) info.rate);
251         len = len * info.width * info.channels;
252
253         // FIXME: add S_UnloadSounds or something?
254         Mem_FreePool(&s->mempool);
255         s->mempool = Mem_AllocPool(s->name);
256         sc = s->sfxcache = Mem_Alloc(s->mempool, len + sizeof(sfxcache_t));
257         if (!sc)
258         {
259                 Mem_FreePool(&s->mempool);
260                 Mem_Free(data);
261                 return NULL;
262         }
263
264         sc->length = info.samples;
265         sc->loopstart = info.loopstart;
266         sc->speed = info.rate;
267         sc->width = info.width;
268         sc->stereo = info.channels == 2;
269
270         ResampleSfx (sc, data + info.dataofs, s->name);
271
272         Mem_Free(data);
273         return sc;
274 }
275
276
277
278 /*
279 ===============================================================================
280
281 WAV loading
282
283 ===============================================================================
284 */
285
286
287 qbyte *data_p;
288 qbyte *iff_end;
289 qbyte *last_chunk;
290 qbyte *iff_data;
291 int iff_chunk_len;
292
293
294 short GetLittleShort(void)
295 {
296         short val = 0;
297         val = *data_p;
298         val = val + (*(data_p+1)<<8);
299         data_p += 2;
300         return val;
301 }
302
303 int GetLittleLong(void)
304 {
305         int val = 0;
306         val = *data_p;
307         val = val + (*(data_p+1)<<8);
308         val = val + (*(data_p+2)<<16);
309         val = val + (*(data_p+3)<<24);
310         data_p += 4;
311         return val;
312 }
313
314 void FindNextChunk(char *name)
315 {
316         while (1)
317         {
318                 data_p=last_chunk;
319
320                 if (data_p >= iff_end)
321                 {       // didn't find the chunk
322                         data_p = NULL;
323                         return;
324                 }
325
326                 data_p += 4;
327                 iff_chunk_len = GetLittleLong();
328                 if (iff_chunk_len < 0)
329                 {
330                         data_p = NULL;
331                         return;
332                 }
333                 data_p -= 8;
334                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
335                 if (!strncmp(data_p, name, 4))
336                         return;
337         }
338 }
339
340 void FindChunk(char *name)
341 {
342         last_chunk = iff_data;
343         FindNextChunk (name);
344 }
345
346
347 void DumpChunks(void)
348 {
349         char str[5];
350
351         str[4] = 0;
352         data_p=iff_data;
353         do
354         {
355                 memcpy (str, data_p, 4);
356                 data_p += 4;
357                 iff_chunk_len = GetLittleLong();
358                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
359                 data_p += (iff_chunk_len + 1) & ~1;
360         } while (data_p < iff_end);
361 }
362
363 /*
364 ============
365 GetWavinfo
366 ============
367 */
368 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
369 {
370         wavinfo_t info;
371         int i;
372         int format;
373         int samples;
374
375         memset (&info, 0, sizeof(info));
376
377         if (!wav)
378                 return info;
379
380         iff_data = wav;
381         iff_end = wav + wavlength;
382
383         // find "RIFF" chunk
384         FindChunk("RIFF");
385         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
386         {
387                 Con_Printf("Missing RIFF/WAVE chunks\n");
388                 return info;
389         }
390
391         // get "fmt " chunk
392         iff_data = data_p + 12;
393         //DumpChunks ();
394
395         FindChunk("fmt ");
396         if (!data_p)
397         {
398                 Con_Printf("Missing fmt chunk\n");
399                 return info;
400         }
401         data_p += 8;
402         format = GetLittleShort();
403         if (format != 1)
404         {
405                 Con_Printf("Microsoft PCM format only\n");
406                 return info;
407         }
408
409         info.channels = GetLittleShort();
410         info.rate = GetLittleLong();
411         data_p += 4+2;
412         info.width = GetLittleShort() / 8;
413
414         // get cue chunk
415         FindChunk("cue ");
416         if (data_p)
417         {
418                 data_p += 32;
419                 info.loopstart = GetLittleLong();
420
421                 // if the next chunk is a LIST chunk, look for a cue length marker
422                 FindNextChunk ("LIST");
423                 if (data_p)
424                 {
425                         if (!strncmp (data_p + 28, "mark", 4))
426                         {       // this is not a proper parse, but it works with cooledit...
427                                 data_p += 24;
428                                 i = GetLittleLong ();   // samples in loop
429                                 info.samples = info.loopstart + i;
430                         }
431                 }
432         }
433         else
434                 info.loopstart = -1;
435
436         // find data chunk
437         FindChunk("data");
438         if (!data_p)
439         {
440                 Con_Printf("Missing data chunk\n");
441                 return info;
442         }
443
444         data_p += 4;
445         samples = GetLittleLong () / info.width / info.channels;
446
447         if (info.samples)
448         {
449                 if (samples < info.samples)
450                         Host_Error ("Sound %s has a bad loop length", name);
451         }
452         else
453                 info.samples = samples;
454
455         info.dataofs = data_p - wav;
456
457         return info;
458 }
459