home *** CD-ROM | disk | FTP | other *** search
- /*
- Copyright (C) 1997-2001 Id Software, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
- See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // snd_mem.c: sound caching
-
- #include "client.h"
- #include "snd_loc.h"
-
- int cache_full_cycle;
-
- byte *S_Alloc (int size);
-
- /*
- ================
- ResampleSfx
- ================
- */
- void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
- {
- int outcount;
- int srcsample;
- float stepscale;
- int i;
- int sample, samplefrac, fracstep;
- sfxcache_t *sc;
-
- sc = sfx->cache;
- if (!sc)
- return;
-
- stepscale = (float)inrate / dma.speed; // this is usually 0.5, 1, or 2
-
- outcount = sc->length / stepscale;
- sc->length = outcount;
- if (sc->loopstart != -1)
- sc->loopstart = sc->loopstart / stepscale;
-
- sc->speed = dma.speed;
- if (s_loadas8bit->value)
- sc->width = 1;
- else
- sc->width = inwidth;
- sc->stereo = 0;
-
- // resample / decimate to the current source rate
-
- if (stepscale == 1 && inwidth == 1 && sc->width == 1)
- {
- // fast special case
- for (i=0 ; i<outcount ; i++)
- ((signed char *)sc->data)[i]
- = (int)( (unsigned char)(data[i]) - 128);
- }
- else
- {
- // general case
- samplefrac = 0;
- fracstep = stepscale*256;
- for (i=0 ; i<outcount ; i++)
- {
- srcsample = samplefrac >> 8;
- samplefrac += fracstep;
- if (inwidth == 2)
- sample = LittleShort ( ((short *)data)[srcsample] );
- else
- sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8;
- if (sc->width == 2)
- ((short *)sc->data)[i] = sample;
- else
- ((signed char *)sc->data)[i] = sample >> 8;
- }
- }
- }
-
- //=============================================================================
-
- /*
- ==============
- S_LoadSound
- ==============
- */
- sfxcache_t *S_LoadSound (sfx_t *s)
- {
- char namebuffer[MAX_QPATH];
- byte *data;
- wavinfo_t info;
- int len;
- float stepscale;
- sfxcache_t *sc;
- int size;
- char *name;
-
- if (s->name[0] == '*')
- return NULL;
-
- // see if still in memory
- sc = s->cache;
- if (sc)
- return sc;
-
- //Com_Printf ("S_LoadSound: %x\n", (int)stackbuf);
- // load it in
- if (s->truename)
- name = s->truename;
- else
- name = s->name;
-
- if (name[0] == '#')
- strcpy(namebuffer, &name[1]);
- else
- Com_sprintf (namebuffer, sizeof(namebuffer), "sound/%s", name);
-
- // Com_Printf ("loading %s\n",namebuffer);
-
- size = FS_LoadFile (namebuffer, (void **)&data);
-
- if (!data)
- {
- Com_DPrintf ("Couldn't load %s\n", namebuffer);
- return NULL;
- }
-
- info = GetWavinfo (s->name, data, size);
- if (info.channels != 1)
- {
- Com_Printf ("%s is a stereo sample\n",s->name);
- FS_FreeFile (data);
- return NULL;
- }
-
- stepscale = (float)info.rate / dma.speed;
- len = info.samples / stepscale;
-
- len = len * info.width * info.channels;
-
- sc = s->cache = Z_Malloc (len + sizeof(sfxcache_t));
- if (!sc)
- {
- FS_FreeFile (data);
- return NULL;
- }
-
- sc->length = info.samples;
- sc->loopstart = info.loopstart;
- sc->speed = info.rate;
- sc->width = info.width;
- sc->stereo = info.channels;
-
- ResampleSfx (s, sc->speed, sc->width, data + info.dataofs);
-
- FS_FreeFile (data);
-
- return sc;
- }
-
-
-
- /*
- ===============================================================================
-
- WAV loading
-
- ===============================================================================
- */
-
-
- byte *data_p;
- byte *iff_end;
- byte *last_chunk;
- byte *iff_data;
- int iff_chunk_len;
-
-
- short GetLittleShort(void)
- {
- short val = 0;
- val = *data_p;
- val = val + (*(data_p+1)<<8);
- data_p += 2;
- return val;
- }
-
- int GetLittleLong(void)
- {
- int val = 0;
- val = *data_p;
- val = val + (*(data_p+1)<<8);
- val = val + (*(data_p+2)<<16);
- val = val + (*(data_p+3)<<24);
- data_p += 4;
- return val;
- }
-
- void FindNextChunk(char *name)
- {
- while (1)
- {
- data_p=last_chunk;
-
- if (data_p >= iff_end)
- { // didn't find the chunk
- data_p = NULL;
- return;
- }
-
- data_p += 4;
- iff_chunk_len = GetLittleLong();
- if (iff_chunk_len < 0)
- {
- data_p = NULL;
- return;
- }
- // if (iff_chunk_len > 1024*1024)
- // Sys_Error ("FindNextChunk: %i length is past the 1 meg sanity limit", iff_chunk_len);
- data_p -= 8;
- last_chunk = data_p + 8 + ( (iff_chunk_len + 1) & ~1 );
- if (!strncmp(data_p, name, 4))
- return;
- }
- }
-
- void FindChunk(char *name)
- {
- last_chunk = iff_data;
- FindNextChunk (name);
- }
-
-
- void DumpChunks(void)
- {
- char str[5];
-
- str[4] = 0;
- data_p=iff_data;
- do
- {
- memcpy (str, data_p, 4);
- data_p += 4;
- iff_chunk_len = GetLittleLong();
- Com_Printf ("0x%x : %s (%d)\n", (int)(data_p - 4), str, iff_chunk_len);
- data_p += (iff_chunk_len + 1) & ~1;
- } while (data_p < iff_end);
- }
-
- /*
- ============
- GetWavinfo
- ============
- */
- wavinfo_t GetWavinfo (char *name, byte *wav, int wavlength)
- {
- wavinfo_t info;
- int i;
- int format;
- int samples;
-
- memset (&info, 0, sizeof(info));
-
- if (!wav)
- return info;
-
- iff_data = wav;
- iff_end = wav + wavlength;
-
- // find "RIFF" chunk
- FindChunk("RIFF");
- if (!(data_p && !strncmp(data_p+8, "WAVE", 4)))
- {
- Com_Printf("Missing RIFF/WAVE chunks\n");
- return info;
- }
-
- // get "fmt " chunk
- iff_data = data_p + 12;
- // DumpChunks ();
-
- FindChunk("fmt ");
- if (!data_p)
- {
- Com_Printf("Missing fmt chunk\n");
- return info;
- }
- data_p += 8;
- format = GetLittleShort();
- if (format != 1)
- {
- Com_Printf("Microsoft PCM format only\n");
- return info;
- }
-
- info.channels = GetLittleShort();
- info.rate = GetLittleLong();
- data_p += 4+2;
- info.width = GetLittleShort() / 8;
-
- // get cue chunk
- FindChunk("cue ");
- if (data_p)
- {
- data_p += 32;
- info.loopstart = GetLittleLong();
- // Com_Printf("loopstart=%d\n", sfx->loopstart);
-
- // if the next chunk is a LIST chunk, look for a cue length marker
- FindNextChunk ("LIST");
- if (data_p)
- {
- if (!strncmp (data_p + 28, "mark", 4))
- { // this is not a proper parse, but it works with cooledit...
- data_p += 24;
- i = GetLittleLong (); // samples in loop
- info.samples = info.loopstart + i;
- // Com_Printf("looped length: %i\n", i);
- }
- }
- }
- else
- info.loopstart = -1;
-
- // find data chunk
- FindChunk("data");
- if (!data_p)
- {
- Com_Printf("Missing data chunk\n");
- return info;
- }
-
- data_p += 4;
- samples = GetLittleLong () / info.width;
-
- if (info.samples)
- {
- if (samples < info.samples)
- Com_Error (ERR_DROP, "Sound %s has a bad loop length", name);
- }
- else
- info.samples = samples;
-
- info.dataofs = data_p - wav;
-
- return info;
- }
-
-