Added in_mouse_x and in_mouse_y, which contain the rel. coords of the mouse.
[divverent/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         Con_DPrintf("ResampleSfx: resampling sound %s from %dhz to %dhz (%d samples to %d samples)\n", name, sc->speed, shm->speed, sc->length, outcount);
40         sc->length = outcount;
41         if (sc->loopstart != -1)
42                 sc->loopstart = (double) sc->loopstart * (double) shm->speed / (double) sc->speed;
43
44         sc->speed = shm->speed;
45
46 // resample / decimate to the current source rate
47
48         if (fracstep == 256)
49         {
50                 // fast case for direct transfer
51                 if (sc->width == 1) // 8bit
52                         for (i = 0;i < srclength;i++)
53                                 ((signed char *)sc->data)[i] = ((unsigned char *)data)[i] - 128;
54                 else //if (sc->width == 2) // 16bit
55                         for (i = 0;i < srclength;i++)
56                                 ((short *)sc->data)[i] = LittleShort (((short *)data)[i]);
57         }
58         else
59         {
60                 // general case
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[MAX_QPATH];
216         qbyte *data;
217         wavinfo_t info;
218         int len;
219         sfxcache_t *sc;
220
221         // see if still in memory
222         if (!shm || !shm->speed)
223                 return NULL;
224         if (s->sfxcache && s->sfxcache->speed == shm->speed)
225                 return s->sfxcache;
226
227         // load it in
228         snprintf(namebuffer, sizeof(namebuffer), "sound/%s", s->name);
229
230         data = FS_LoadFile(namebuffer, false);
231
232         if (!data)
233         {
234                 s->silentlymissing = !complain;
235                 if (complain)
236                         Con_Printf("Couldn't load %s\n", namebuffer);
237                 return NULL;
238         }
239
240         info = GetWavinfo (s->name, data, fs_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                 Con_Printf("failed to allocate memory for sound \"%s\"\n", s->name);
260                 Mem_FreePool(&s->mempool);
261                 Mem_Free(data);
262                 return NULL;
263         }
264
265         sc->length = info.samples;
266         sc->loopstart = info.loopstart;
267         sc->speed = info.rate;
268         sc->width = info.width;
269         sc->stereo = info.channels == 2;
270
271         ResampleSfx(sc, data + info.dataofs, s->name);
272
273         Mem_Free(data);
274         return sc;
275 }
276
277 void S_UnloadSound(sfx_t *s)
278 {
279         if (s->sfxcache)
280         {
281                 s->sfxcache = NULL;
282                 Mem_FreePool(&s->mempool);
283         }
284 }
285
286
287 /*
288 ===============================================================================
289
290 WAV loading
291
292 ===============================================================================
293 */
294
295
296 qbyte *data_p;
297 qbyte *iff_end;
298 qbyte *last_chunk;
299 qbyte *iff_data;
300 int iff_chunk_len;
301
302
303 short GetLittleShort(void)
304 {
305         short val = 0;
306         val = *data_p;
307         val = val + (*(data_p+1)<<8);
308         data_p += 2;
309         return val;
310 }
311
312 int GetLittleLong(void)
313 {
314         int val = 0;
315         val = *data_p;
316         val = val + (*(data_p+1)<<8);
317         val = val + (*(data_p+2)<<16);
318         val = val + (*(data_p+3)<<24);
319         data_p += 4;
320         return val;
321 }
322
323 void FindNextChunk(char *name)
324 {
325         while (1)
326         {
327                 data_p=last_chunk;
328
329                 if (data_p >= iff_end)
330                 {       // didn't find the chunk
331                         data_p = NULL;
332                         return;
333                 }
334
335                 data_p += 4;
336                 iff_chunk_len = GetLittleLong();
337                 if (iff_chunk_len < 0)
338                 {
339                         data_p = NULL;
340                         return;
341                 }
342                 data_p -= 8;
343                 last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
344                 if (!strncmp(data_p, name, 4))
345                         return;
346         }
347 }
348
349 void FindChunk(char *name)
350 {
351         last_chunk = iff_data;
352         FindNextChunk (name);
353 }
354
355
356 void DumpChunks(void)
357 {
358         char str[5];
359
360         str[4] = 0;
361         data_p=iff_data;
362         do
363         {
364                 memcpy (str, data_p, 4);
365                 data_p += 4;
366                 iff_chunk_len = GetLittleLong();
367                 Con_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
368                 data_p += (iff_chunk_len + 1) & ~1;
369         } while (data_p < iff_end);
370 }
371
372 /*
373 ============
374 GetWavinfo
375 ============
376 */
377 wavinfo_t GetWavinfo (char *name, qbyte *wav, int wavlength)
378 {
379         wavinfo_t info;
380         int i;
381         int format;
382         int samples;
383
384         memset (&info, 0, sizeof(info));
385
386         if (!wav)
387                 return info;
388
389         iff_data = wav;
390         iff_end = wav + wavlength;
391
392         // find "RIFF" chunk
393         FindChunk("RIFF");
394         if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
395         {
396                 Con_Printf("Missing RIFF/WAVE chunks\n");
397                 return info;
398         }
399
400         // get "fmt " chunk
401         iff_data = data_p + 12;
402         //DumpChunks ();
403
404         FindChunk("fmt ");
405         if (!data_p)
406         {
407                 Con_Printf("Missing fmt chunk\n");
408                 return info;
409         }
410         data_p += 8;
411         format = GetLittleShort();
412         if (format != 1)
413         {
414                 Con_Printf("Microsoft PCM format only\n");
415                 return info;
416         }
417
418         info.channels = GetLittleShort();
419         info.rate = GetLittleLong();
420         data_p += 4+2;
421         info.width = GetLittleShort() / 8;
422
423         // get cue chunk
424         FindChunk("cue ");
425         if (data_p)
426         {
427                 data_p += 32;
428                 info.loopstart = GetLittleLong();
429
430                 // if the next chunk is a LIST chunk, look for a cue length marker
431                 FindNextChunk ("LIST");
432                 if (data_p)
433                 {
434                         if (!strncmp (data_p + 28, "mark", 4))
435                         {       // this is not a proper parse, but it works with cooledit...
436                                 data_p += 24;
437                                 i = GetLittleLong ();   // samples in loop
438                                 info.samples = info.loopstart + i;
439                         }
440                 }
441         }
442         else
443                 info.loopstart = -1;
444
445         // find data chunk
446         FindChunk("data");
447         if (!data_p)
448         {
449                 Con_Printf("Missing data chunk\n");
450                 return info;
451         }
452
453         data_p += 4;
454         samples = GetLittleLong () / info.width / info.channels;
455
456         if (info.samples)
457         {
458                 if (samples < info.samples)
459                         Host_Error ("Sound %s has a bad loop length", name);
460         }
461         else
462                 info.samples = samples;
463
464         info.dataofs = data_p - wav;
465
466         return info;
467 }
468