2 Copyright (C) 1996-1997 Id Software, Inc.
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.
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.
13 See the GNU General Public License for more details.
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.
20 // snd_dma.c -- main control for any streaming sound output device
27 extern DWORD gSndBufSize;
28 extern LPDIRECTSOUND pDS;
29 extern LPDIRECTSOUNDBUFFER pDSBuf;
38 void S_SoundList(void);
40 void S_StopAllSounds(qboolean clear);
41 void S_StopAllSoundsC(void);
43 // =======================================================================
44 // Internal sound data & structures
45 // =======================================================================
47 channel_t channels[MAX_CHANNELS];
51 static qboolean snd_ambient = 1;
52 cvar_t snd_initialized = { CVAR_READONLY, "snd_initialized", "0"};
54 // pointer should go away
55 volatile dma_t *shm = 0;
58 vec3_t listener_vieworigin;
59 vec3_t listener_viewforward;
60 vec3_t listener_viewleft;
61 vec3_t listener_viewup;
62 vec_t sound_nominal_clip_dist=1000.0;
63 mempool_t *snd_mempool;
70 //LordHavoc: increased the client sound limit from 512 to 4096 for the Nehahra movie
72 sfx_t *known_sfx; // allocated [MAX_SFX]
75 sfx_t *ambient_sfx[NUM_AMBIENTS];
77 int sound_started = 0;
79 cvar_t bgmvolume = {CVAR_SAVE, "bgmvolume", "1"};
80 cvar_t volume = {CVAR_SAVE, "volume", "0.7"};
81 cvar_t snd_staticvolume = {CVAR_SAVE, "snd_staticvolume", "1"};
83 cvar_t nosound = {0, "nosound", "0"};
84 cvar_t snd_precache = {0, "snd_precache", "1"};
85 cvar_t bgmbuffer = {0, "bgmbuffer", "4096"};
86 cvar_t ambient_level = {0, "ambient_level", "0.3"};
87 cvar_t ambient_fade = {0, "ambient_fade", "100"};
88 cvar_t snd_noextraupdate = {0, "snd_noextraupdate", "0"};
89 cvar_t snd_show = {0, "snd_show", "0"};
90 cvar_t _snd_mixahead = {CVAR_SAVE, "_snd_mixahead", "0.1"};
91 cvar_t snd_swapstereo = {CVAR_SAVE, "snd_swapstereo", "0"};
94 // ====================================================================
95 // User-setable variables
96 // ====================================================================
100 // Fake dma is a synchronous faking of the DMA progress used for
101 // isolating performance in the renderer. The fakedma_updates is
102 // number of times S_Update() is called per second.
105 qboolean fakedma = false;
106 int fakedma_updates = 15;
109 void S_AmbientOff (void)
115 void S_AmbientOn (void)
121 void S_SoundInfo_f(void)
123 if (!sound_started || !shm)
125 Con_Printf ("sound system not started\n");
129 Con_Printf("%5d stereo\n", shm->channels - 1);
130 Con_Printf("%5d samples\n", shm->samples);
131 Con_Printf("%5d samplepos\n", shm->samplepos);
132 Con_Printf("%5d samplebits\n", shm->samplebits);
133 Con_Printf("%5d speed\n", shm->speed);
134 Con_Printf("0x%x dma buffer\n", shm->buffer);
135 Con_Printf("%5d total_channels\n", total_channels);
138 void S_UnloadSounds(void)
141 for (i = 0;i < num_sfx;i++)
142 S_UnloadSound(known_sfx + i);
145 void S_LoadSounds(void)
148 for (i = 0;i < num_sfx;i++)
149 S_LoadSound(known_sfx + i, false);
154 if (!snd_initialized.integer)
158 memset((void *)shm, 0, sizeof(*shm));
160 // create a piece of DMA memory
164 shm->samplebits = 16;
167 shm->samples = 32768;
169 shm->buffer = Mem_Alloc(snd_mempool, shm->channels * shm->samples * (shm->samplebits / 8));
175 Con_Printf("S_Startup: SNDDMA_Init failed.\n");
184 Con_DPrintf("Sound sampling rate: %i\n", shm->speed);
188 S_StopAllSounds(true);
191 void S_Shutdown(void)
199 Mem_Free(shm->buffer);
207 void S_Restart_f(void)
220 Con_DPrintf("\nSound Initialization\n");
222 S_RawSamples_ClearQueue();
224 Cvar_RegisterVariable(&volume);
225 Cvar_RegisterVariable(&bgmvolume);
226 Cvar_RegisterVariable(&snd_staticvolume);
228 if (COM_CheckParm("-nosound") || COM_CheckParm("-safe"))
231 snd_mempool = Mem_AllocPool("sound");
233 if (COM_CheckParm("-simsound"))
236 Cmd_AddCommand("play", S_Play);
237 Cmd_AddCommand("play2", S_Play2);
238 Cmd_AddCommand("playvol", S_PlayVol);
239 Cmd_AddCommand("stopsound", S_StopAllSoundsC);
240 Cmd_AddCommand("soundlist", S_SoundList);
241 Cmd_AddCommand("soundinfo", S_SoundInfo_f);
242 Cmd_AddCommand("snd_restart", S_Restart_f);
244 Cvar_RegisterVariable(&nosound);
245 Cvar_RegisterVariable(&snd_precache);
246 Cvar_RegisterVariable(&snd_initialized);
247 Cvar_RegisterVariable(&bgmbuffer);
248 Cvar_RegisterVariable(&ambient_level);
249 Cvar_RegisterVariable(&ambient_fade);
250 Cvar_RegisterVariable(&snd_noextraupdate);
251 Cvar_RegisterVariable(&snd_show);
252 Cvar_RegisterVariable(&_snd_mixahead);
253 Cvar_RegisterVariable(&snd_swapstereo); // LordHavoc: for people with backwards sound wiring
255 Cvar_SetValueQuick(&snd_initialized, true);
257 known_sfx = Mem_Alloc(snd_mempool, MAX_SFX*sizeof(sfx_t));
260 SND_InitScaletable ();
262 ambient_sfx[AMBIENT_WATER] = S_PrecacheSound ("ambience/water1.wav", false);
263 ambient_sfx[AMBIENT_SKY] = S_PrecacheSound ("ambience/wind2.wav", false);
265 total_channels = MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS; // no statics
266 memset(channels, 0, MAX_CHANNELS * sizeof(channel_t));
272 // =======================================================================
274 // =======================================================================
282 sfx_t *S_GetCached (const char *name)
286 if (!snd_initialized.integer)
290 Host_Error("S_IsCached: NULL\n");
292 if (strlen(name) >= MAX_QPATH)
293 Host_Error("Sound name too long: %s", name);
295 for(i = 0;i < num_sfx;i++)
296 if(!strcmp(known_sfx[i].name, name))
297 return &known_sfx[i];
308 sfx_t *S_FindName (char *name)
313 if (!snd_initialized.integer)
317 Host_Error("S_FindName: NULL\n");
319 if (strlen(name) >= MAX_QPATH)
320 Host_Error("Sound name too long: %s", name);
322 // see if already loaded
323 for (i = 0;i < num_sfx;i++)
324 if (!strcmp(known_sfx[i].name, name))
325 return &known_sfx[i];
327 if (num_sfx == MAX_SFX)
328 Sys_Error("S_FindName: out of sfx_t");
330 sfx = &known_sfx[num_sfx++];
331 memset(sfx, 0, sizeof(*sfx));
332 snprintf(sfx->name, sizeof(sfx->name), "%s", name);
343 void S_TouchSound (char *name)
354 sfx_t *S_PrecacheSound (char *name, int complain)
358 if (!snd_initialized.integer)
361 sfx = S_FindName(name);
363 if (!nosound.integer && snd_precache.integer)
364 S_LoadSound(sfx, complain);
370 //=============================================================================
377 channel_t *SND_PickChannel(int entnum, int entchannel)
383 // Check for replacement sound, or find the best one to replace
385 life_left = 0x7fffffff;
386 for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++)
388 if (entchannel != 0 // channel 0 never overrides
389 && channels[ch_idx].entnum == entnum
390 && (channels[ch_idx].entchannel == entchannel || entchannel == -1) )
391 { // always override sound from same entity
392 first_to_die = ch_idx;
396 // don't let monster sounds override player sounds
397 if (channels[ch_idx].entnum == cl.viewentity && entnum != cl.viewentity && channels[ch_idx].sfx)
400 if (channels[ch_idx].end - paintedtime < life_left)
402 life_left = channels[ch_idx].end - paintedtime;
403 first_to_die = ch_idx;
407 if (first_to_die == -1)
410 if (channels[first_to_die].sfx)
411 channels[first_to_die].sfx = NULL;
413 return &channels[first_to_die];
421 void SND_Spatialize(channel_t *ch, int isstatic)
423 vec_t dist, scale, pan;
426 // anything coming from the view entity will always be full volume
427 // LordHavoc: make sounds with ATTN_NONE have no spatialization
428 if (ch->entnum == cl.viewentity || ch->dist_mult == 0)
430 ch->leftvol = ch->master_vol;
431 ch->rightvol = ch->master_vol;
435 // update sound origin if we know about the entity
436 if (ch->entnum > 0 && cls.state == ca_connected && cl_entities[ch->entnum].state_current.active)
438 //Con_Printf("-- entnum %i origin %f %f %f neworigin %f %f %f\n", ch->entnum, ch->origin[0], ch->origin[1], ch->origin[2], cl_entities[ch->entnum].state_current.origin[0], cl_entities[ch->entnum].state_current.origin[1], cl_entities[ch->entnum].state_current.origin[2]);
439 VectorCopy(cl_entities[ch->entnum].state_current.origin, ch->origin);
440 if (cl_entities[ch->entnum].state_current.modelindex && cl.model_precache[cl_entities[ch->entnum].state_current.modelindex]->soundfromcenter)
441 VectorMAMAM(1.0f, ch->origin, 0.5f, cl.model_precache[cl_entities[ch->entnum].state_current.modelindex]->normalmins, 0.5f, cl.model_precache[cl_entities[ch->entnum].state_current.modelindex]->normalmaxs, ch->origin);
444 // calculate stereo seperation and distance attenuation
445 VectorSubtract(ch->origin, listener_vieworigin, source_vec);
446 dist = VectorNormalizeLength(source_vec);
448 scale = ch->master_vol * (1.0 - (dist * ch->dist_mult));
450 pan = scale * DotProduct(listener_viewleft, source_vec);
451 // calculate the volumes
452 ch->leftvol = (int) (scale + pan);
453 ch->rightvol = (int) (scale - pan);
456 // LordHavoc: allow adjusting volume of static sounds
459 ch->leftvol *= snd_staticvolume.value;
460 ch->rightvol *= snd_staticvolume.value;
464 ch->leftvol = bound(0, ch->leftvol, 255);
465 ch->rightvol = bound(0, ch->rightvol, 255);
469 // =======================================================================
470 // Start a sound effect
471 // =======================================================================
473 void S_StartSound(int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation)
475 channel_t *target_chan, *check;
481 if (!sound_started || !sfx || !sfx->sfxcache || nosound.integer)
486 // pick a channel to play on
487 target_chan = SND_PickChannel(entnum, entchannel);
492 memset (target_chan, 0, sizeof(*target_chan));
493 VectorCopy(origin, target_chan->origin);
494 target_chan->dist_mult = attenuation / sound_nominal_clip_dist;
495 target_chan->master_vol = vol;
496 target_chan->entnum = entnum;
497 target_chan->entchannel = entchannel;
498 SND_Spatialize(target_chan, false);
500 // LordHavoc: spawn the sound anyway because the player might teleport to it
501 //if (!target_chan->leftvol && !target_chan->rightvol)
502 // return; // not audible at all
505 sc = S_LoadSound (sfx, true);
508 target_chan->sfx = NULL;
509 return; // couldn't load the sound's data
512 target_chan->sfx = sfx;
513 target_chan->pos = 0.0;
514 target_chan->end = paintedtime + sc->length;
516 // if an identical sound has also been started this frame, offset the pos
517 // a bit to keep it from just making the first one louder
518 check = &channels[NUM_AMBIENTS];
519 for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++, check++)
521 if (check == target_chan)
523 if (check->sfx == sfx && !check->pos)
525 // LordHavoc: fixed skip calculations
526 skip = 0.1 * sc->speed;
527 if (skip > sc->length)
530 skip = rand() % skip;
531 target_chan->pos += skip;
532 target_chan->end -= skip;
538 void S_StopSound(int entnum, int entchannel)
542 for (i=0 ; i<MAX_DYNAMIC_CHANNELS ; i++)
544 if (channels[i].entnum == entnum
545 && channels[i].entchannel == entchannel)
548 channels[i].sfx = NULL;
554 void S_StopAllSounds(qboolean clear)
556 total_channels = MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS; // no statics
557 memset(channels, 0, MAX_CHANNELS * sizeof(channel_t));
563 void S_StopAllSoundsC(void)
565 S_StopAllSounds(true);
568 void S_ClearBuffer(void)
572 if (!sound_started || !shm)
575 if (shm->samplebits == 8)
590 while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, (LPVOID*)&pData, &dwSize, NULL, NULL, 0)) != DS_OK)
592 if (hresult != DSERR_BUFFERLOST)
594 Con_Printf ("S_ClearBuffer: DS::Lock Sound Buffer Failed\n");
601 Con_Printf ("S_ClearBuffer: DS: couldn't restore buffer\n");
607 memset(pData, clear, shm->samples * shm->samplebits/8);
609 pDSBuf->lpVtbl->Unlock(pDSBuf, pData, dwSize, NULL, 0);
616 int setsize = shm->samples * shm->samplebits / 8;
617 char *buf = shm->buffer;
622 // on i586/i686 optimized versions of glibc, glibc *wrongly* IMO,
623 // reads the memory area before writing to it causing a seg fault
624 // since the memory is PROT_WRITE only and not PROT_READ|PROT_WRITE
625 // memset(shm->buffer, clear, shm->samples * shm->samplebits/8);
635 void S_StaticSound (sfx_t *sfx, vec3_t origin, float vol, float attenuation)
643 if (total_channels == MAX_CHANNELS)
645 Con_Printf ("total_channels == MAX_CHANNELS\n");
649 sc = S_LoadSound (sfx, true);
653 if (sc->loopstart == -1)
654 Con_DPrintf("Quake compatibility warning: Static sound \"%s\" is not looped\n", sfx->name);
656 ss = &channels[total_channels++];
657 memset(ss, 0, sizeof(*ss));
658 ss->forceloop = true;
660 VectorCopy (origin, ss->origin);
661 ss->master_vol = vol;
662 ss->dist_mult = (attenuation/64) / sound_nominal_clip_dist;
663 ss->end = paintedtime + sc->length;
665 SND_Spatialize (ss, true);
669 //=============================================================================
673 S_UpdateAmbientSounds
676 void S_UpdateAmbientSounds (void)
681 qbyte ambientlevels[NUM_AMBIENTS];
683 // LordHavoc: kill ambient sounds until proven otherwise
684 for (ambient_channel = 0 ; ambient_channel < NUM_AMBIENTS;ambient_channel++)
685 channels[ambient_channel].sfx = NULL;
687 if (!snd_ambient || ambient_level.value <= 0 || !cl.worldmodel || !cl.worldmodel->brush.AmbientSoundLevelsForPoint)
690 cl.worldmodel->brush.AmbientSoundLevelsForPoint(cl.worldmodel, listener_vieworigin, ambientlevels, sizeof(ambientlevels));
692 // calc ambient sound levels
693 for (ambient_channel = 0 ; ambient_channel< NUM_AMBIENTS ; ambient_channel++)
695 if (ambient_sfx[ambient_channel] && ambient_sfx[ambient_channel]->silentlymissing)
697 chan = &channels[ambient_channel];
698 chan->forceloop = true;
699 chan->sfx = ambient_sfx[ambient_channel];
701 vol = ambient_level.value * ambientlevels[ambient_channel];
705 // don't adjust volume too fast
706 if (chan->master_vol < vol)
708 chan->master_vol += host_realframetime * ambient_fade.value;
709 if (chan->master_vol > vol)
710 chan->master_vol = vol;
712 else if (chan->master_vol > vol)
714 chan->master_vol -= host_realframetime * ambient_fade.value;
715 if (chan->master_vol < vol)
716 chan->master_vol = vol;
719 chan->leftvol = chan->rightvol = chan->master_vol;
728 Called once each time through the main loop
731 void S_Update(vec3_t origin, vec3_t forward, vec3_t left, vec3_t up)
738 if (!snd_initialized.integer || (snd_blocked > 0))
741 VectorCopy(origin, listener_vieworigin);
742 VectorCopy(forward, listener_viewforward);
743 VectorCopy(left, listener_viewleft);
744 VectorCopy(up, listener_viewup);
746 // update general area ambient sound sources
747 S_UpdateAmbientSounds ();
751 // update spatialization for static and dynamic sounds
752 ch = channels+NUM_AMBIENTS;
753 for (i=NUM_AMBIENTS ; i<total_channels; i++, ch++)
757 SND_Spatialize(ch, i >= MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS); // respatialize channel
758 if (!ch->leftvol && !ch->rightvol)
761 // try to combine static sounds with a previous channel of the same
762 // sound effect so we don't mix five torches every frame
764 if (i > MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS)
766 // see if it can just use the last one
767 if (combine && combine->sfx == ch->sfx)
769 combine->leftvol += ch->leftvol;
770 combine->rightvol += ch->rightvol;
771 ch->leftvol = ch->rightvol = 0;
775 combine = channels+MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS;
776 for (j=MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS ; j<i; j++, combine++)
777 if (combine->sfx == ch->sfx)
780 if (j == total_channels)
786 combine->leftvol += ch->leftvol;
787 combine->rightvol += ch->rightvol;
788 ch->leftvol = ch->rightvol = 0;
798 if (snd_show.integer)
802 for (i=0 ; i<total_channels; i++, ch++)
803 if (ch->sfx && (ch->leftvol || ch->rightvol) )
806 Con_Printf ("----(%i)----\n", total);
813 void GetSoundtime(void)
817 static int oldsamplepos;
820 fullsamples = shm->samples / shm->channels;
822 // it is possible to miscount buffers if it has wrapped twice between
823 // calls to S_Update. Oh well.
824 samplepos = SNDDMA_GetDMAPos();
826 if (samplepos < oldsamplepos)
828 buffers++; // buffer wrapped
830 if (paintedtime > 0x40000000)
831 { // time to chop things off to avoid 32 bit limits
833 paintedtime = fullsamples;
834 S_StopAllSounds (true);
837 oldsamplepos = samplepos;
839 soundtime = buffers*fullsamples + samplepos/shm->channels;
842 void IN_Accumulate (void);
844 void S_ExtraUpdate (void)
851 if (snd_noextraupdate.integer)
852 return; // don't pollute timings
861 if (!sound_started || (snd_blocked > 0))
867 // check to make sure that we haven't overshot
868 if (paintedtime < soundtime)
869 paintedtime = soundtime;
871 // mix ahead of current position
872 endtime = soundtime + _snd_mixahead.value * shm->speed;
873 samps = shm->samples >> (shm->channels-1);
874 if (endtime > (unsigned int)(soundtime + samps))
875 endtime = soundtime + samps;
878 // if the buffer was lost or stopped, restore it and/or restart it
884 if (pDSBuf->lpVtbl->GetStatus (pDSBuf, &dwStatus) != DD_OK)
885 Con_Printf ("Couldn't get sound buffer status\n");
887 if (dwStatus & DSBSTATUS_BUFFERLOST)
888 pDSBuf->lpVtbl->Restore (pDSBuf);
890 if (!(dwStatus & DSBSTATUS_PLAYING))
891 pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);
896 S_PaintChannels (endtime);
902 ===============================================================================
906 ===============================================================================
909 static void S_Play_Common(float fvol, float attenuation)
918 if (!strrchr(Cmd_Argv(i), '.'))
919 snprintf(name, sizeof(name), "%s.wav", Cmd_Argv(i));
921 strlcpy(name, Cmd_Argv(i), sizeof(name));
922 sfx = S_PrecacheSound(name, true);
924 // If we need to get the volume from the command line
927 fvol = atof(Cmd_Argv(i+1));
933 S_StartSound(-1, 0, sfx, listener_vieworigin, fvol, attenuation);
939 S_Play_Common (1.0f, 1.0f);
944 S_Play_Common (1.0f, 0.0f);
949 S_Play_Common (-1.0f, 0.0f);
952 void S_SoundList(void)
960 for (sfx=known_sfx, i=0 ; i<num_sfx ; i++, sfx++)
965 size = sc->length*sc->width*(sc->stereo+1);
967 Con_Printf("%c(%2db) %6i : %s\n", sc->loopstart >= 0 ? 'L' : ' ',sc->width*8, size, sfx->name);
970 Con_Printf("Total resident: %i\n", total);
974 void S_LocalSound (char *sound)
978 if (!snd_initialized.integer || nosound.integer)
981 sfx = S_PrecacheSound (sound, true);
984 Con_Printf ("S_LocalSound: can't precache %s\n", sound);
987 S_StartSound (cl.viewentity, -1, sfx, vec3_origin, 1, 1);
991 void S_ClearPrecache (void)
996 void S_BeginPrecaching (void)
1001 void S_EndPrecaching (void)
1006 #define RAWSAMPLESBUFFER 32768
1007 short s_rawsamplesbuffer[RAWSAMPLESBUFFER * 2];
1008 int s_rawsamplesbuffer_start;
1009 int s_rawsamplesbuffer_count;
1011 void S_RawSamples_Enqueue(short *samples, unsigned int length)
1014 //Con_Printf("S_RawSamples_Enqueue: %i samples\n", length);
1015 if (s_rawsamplesbuffer_count + length > RAWSAMPLESBUFFER)
1017 b2 = (s_rawsamplesbuffer_start + s_rawsamplesbuffer_count) % RAWSAMPLESBUFFER;
1018 if (b2 + length > RAWSAMPLESBUFFER)
1020 b3 = (b2 + length) % RAWSAMPLESBUFFER;
1021 memcpy(s_rawsamplesbuffer + b2 * 2, samples, (RAWSAMPLESBUFFER - b2) * sizeof(short[2]));
1022 memcpy(s_rawsamplesbuffer, samples + (RAWSAMPLESBUFFER - b2) * 2, b3 * sizeof(short[2]));
1025 memcpy(s_rawsamplesbuffer + b2 * 2, samples, length * sizeof(short[2]));
1026 s_rawsamplesbuffer_count += length;
1029 void S_RawSamples_Dequeue(int *samples, unsigned int length)
1037 if (l > s_rawsamplesbuffer_count)
1038 l = s_rawsamplesbuffer_count;
1039 b1 = (s_rawsamplesbuffer_start) % RAWSAMPLESBUFFER;
1040 if (b1 + l > RAWSAMPLESBUFFER)
1042 b2 = (b1 + l) % RAWSAMPLESBUFFER;
1043 //memcpy(samples, s_rawsamplesbuffer + b1 * 2, (RAWSAMPLESBUFFER - b1) * sizeof(short[2]));
1044 //memcpy(samples + (RAWSAMPLESBUFFER - b1) * 2, s_rawsamplesbuffer, b2 * sizeof(short[2]));
1045 for (out = samples, in = s_rawsamplesbuffer + b1 * 2, count = (RAWSAMPLESBUFFER - b1) * 2, i = 0;i < count;i++)
1047 for (out = samples + (RAWSAMPLESBUFFER - b1) * 2, in = s_rawsamplesbuffer, count = b2 * 2, i = 0;i < count;i++)
1049 //Con_Printf("S_RawSamples_Dequeue: buffer wrap %i %i\n", (RAWSAMPLESBUFFER - b1), b2);
1053 //memcpy(samples, s_rawsamplesbuffer + b1 * 2, l * sizeof(short[2]));
1054 for (out = samples, in = s_rawsamplesbuffer + b1 * 2, count = l * 2, i = 0;i < count;i++)
1056 //Con_Printf("S_RawSamples_Dequeue: normal %i\n", l);
1058 if (l < (int)length)
1060 memset(samples + l * 2, 0, (length - l) * sizeof(int[2]));
1061 //Con_Printf("S_RawSamples_Dequeue: padding with %i samples\n", length - l);
1063 s_rawsamplesbuffer_start = (s_rawsamplesbuffer_start + l) % RAWSAMPLESBUFFER;
1064 s_rawsamplesbuffer_count -= l;
1067 void S_RawSamples_ClearQueue(void)
1069 s_rawsamplesbuffer_count = 0;
1070 s_rawsamplesbuffer_start = 0;
1073 int S_RawSamples_QueueWantsMore(void)
1075 if (shm != NULL && s_rawsamplesbuffer_count < min(shm->speed >> 1, RAWSAMPLESBUFFER >> 1))
1076 return RAWSAMPLESBUFFER - s_rawsamplesbuffer_count;
1081 void S_ResampleBuffer16Stereo(short *input, int inputlength, short *output, int outputlength)
1083 if (inputlength != outputlength)
1085 int i, position, stopposition, step;
1087 step = (float) inputlength * 256.0f / (float) outputlength;
1089 stopposition = (inputlength - 1) << 8;
1091 for (i = 0;i < outputlength && position < stopposition;i++, position += step)
1093 in = input + ((position >> 8) << 1);
1094 out[0] = (((in[1] - in[0]) * (position & 255)) >> 8) + in[0];
1095 out[1] = (((in[3] - in[2]) * (position & 255)) >> 8) + in[2];
1098 stopposition = inputlength << 8;
1099 for (i = 0;i < outputlength && position < stopposition;i++, position += step)
1101 in = input + ((position >> 8) << 1);
1108 memcpy(output, input, inputlength * sizeof(short[2]));
1111 int S_RawSamples_SampleRate(void)
1113 return shm != NULL ? shm->speed : 0;