| /* |
| Copyright (C) 1996-1997 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 "quakedef.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 = (sfxcache_t*) Cache_Check (&sfx->cache); |
| if (!sc) |
| return; |
| |
| stepscale = (float)inrate / shm->speed; // this is usually 0.5, 1, or 2 |
| |
| outcount = (int) (sc->length / stepscale); |
| sc->length = outcount; |
| if (sc->loopstart != -1) |
| sc->loopstart = (int) (sc->loopstart / stepscale); |
| |
| sc->speed = shm->speed; |
| if (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++) |
| sc->data.sc[i] |
| = (int)( (unsigned char)(data[i]) - 128); |
| } |
| else |
| { |
| // general case |
| samplefrac = 0; |
| fracstep = (int) (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) |
| sc->data.s[i] = sample; |
| else |
| sc->data.sc[i] = sample >> 8; |
| } |
| } |
| } |
| |
| //============================================================================= |
| |
| /* |
| ============== |
| S_LoadSound |
| ============== |
| */ |
| sfxcache_t *S_LoadSound (sfx_t *s) |
| { |
| char namebuffer[256]; |
| byte *data; |
| wavinfo_t info; |
| int len; |
| float stepscale; |
| sfxcache_t *sc; |
| byte stackbuf[1*1024]; // avoid dirtying the cache heap |
| |
| // see if still in memory |
| sc = (sfxcache_t*) Cache_Check (&s->cache); |
| if (sc) |
| return sc; |
| |
| //Con_Printf ("S_LoadSound: %x\n", (int)stackbuf); |
| // load it in |
| Q_strcpy(namebuffer, "sound/"); |
| Q_strcat(namebuffer, s->name); |
| |
| // Con_Printf ("loading %s\n",namebuffer); |
| |
| data = COM_LoadStackFile(namebuffer, stackbuf, sizeof(stackbuf)); |
| |
| if (!data) |
| { |
| Con_Printf ("Couldn't load %s\n", namebuffer); |
| return NULL; |
| } |
| |
| info = GetWavinfo (s->name, data, com_filesize); |
| if (info.channels != 1) |
| { |
| Con_Printf ("%s is a stereo sample\n",s->name); |
| return NULL; |
| } |
| |
| stepscale = (float)info.rate / shm->speed; |
| len = (int) (info.samples / stepscale); |
| |
| len = len * info.width * info.channels; |
| |
| sc = (sfxcache_t*) Cache_Alloc ( &s->cache, len + sizeof(sfxcache_t), s->name); |
| if (!sc) |
| 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); |
| |
| 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(const 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 (!Q_strncmp((char*) data_p, name, 4)) |
| return; |
| } |
| } |
| |
| void FindChunk(const 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(); |
| Con_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 && !Q_strncmp((char*) (data_p+8), "WAVE", 4))) |
| { |
| Con_Printf("Missing RIFF/WAVE chunks\n"); |
| return info; |
| } |
| |
| // get "fmt " chunk |
| iff_data = data_p + 12; |
| // DumpChunks (); |
| |
| FindChunk("fmt "); |
| if (!data_p) |
| { |
| Con_Printf("Missing fmt chunk\n"); |
| return info; |
| } |
| data_p += 8; |
| format = GetLittleShort(); |
| if (format != 1) |
| { |
| Con_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(); |
| // Con_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 ((char*) (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; |
| // Con_Printf("looped length: %i\n", i); |
| } |
| } |
| } |
| else |
| info.loopstart = -1; |
| |
| // find data chunk |
| FindChunk("data"); |
| if (!data_p) |
| { |
| Con_Printf("Missing data chunk\n"); |
| return info; |
| } |
| |
| data_p += 4; |
| samples = GetLittleLong () / info.width; |
| |
| if (info.samples) |
| { |
| if (samples < info.samples) |
| Sys_Error ("Sound %s has a bad loop length", name); |
| } |
| else |
| info.samples = samples; |
| |
| info.dataofs = data_p - wav; |
| |
| return info; |
| } |
| |