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
31 void S_SoundList(void);
33 void S_StopAllSounds(qboolean clear);
34 void S_StopAllSoundsC(void);
36 // =======================================================================
37 // Internal sound data & structures
38 // =======================================================================
40 channel_t channels[MAX_CHANNELS];
44 static qboolean snd_ambient = 1;
45 cvar_t snd_initialized = { CVAR_READONLY, "snd_initialized", "0"};
47 // pointer should go away
48 volatile dma_t *shm = 0;
51 vec3_t listener_vieworigin;
52 vec3_t listener_viewforward;
53 vec3_t listener_viewleft;
54 vec3_t listener_viewup;
55 vec_t sound_nominal_clip_dist=1000.0;
56 mempool_t *snd_mempool;
63 //LordHavoc: increased the client sound limit from 512 to 4096 for the Nehahra movie
65 sfx_t *known_sfx; // allocated [MAX_SFX]
68 sfx_t *ambient_sfx[NUM_AMBIENTS];
70 int sound_started = 0;
72 cvar_t bgmvolume = {CVAR_SAVE, "bgmvolume", "1"};
73 cvar_t volume = {CVAR_SAVE, "volume", "0.7"};
74 cvar_t snd_staticvolume = {CVAR_SAVE, "snd_staticvolume", "1"};
76 cvar_t nosound = {0, "nosound", "0"};
77 cvar_t snd_precache = {0, "snd_precache", "1"};
78 cvar_t bgmbuffer = {0, "bgmbuffer", "4096"};
79 cvar_t ambient_level = {0, "ambient_level", "0.3"};
80 cvar_t ambient_fade = {0, "ambient_fade", "100"};
81 cvar_t snd_noextraupdate = {0, "snd_noextraupdate", "0"};
82 cvar_t snd_show = {0, "snd_show", "0"};
83 cvar_t _snd_mixahead = {CVAR_SAVE, "_snd_mixahead", "0.1"};
84 cvar_t snd_swapstereo = {CVAR_SAVE, "snd_swapstereo", "0"};
87 // ====================================================================
88 // User-setable variables
89 // ====================================================================
93 // Fake dma is a synchronous faking of the DMA progress used for
94 // isolating performance in the renderer. The fakedma_updates is
95 // number of times S_Update() is called per second.
98 qboolean fakedma = false;
99 int fakedma_updates = 15;
102 void S_AmbientOff (void)
108 void S_AmbientOn (void)
114 void S_SoundInfo_f(void)
116 if (!sound_started || !shm)
118 Con_Printf ("sound system not started\n");
122 Con_Printf("%5d stereo\n", shm->channels - 1);
123 Con_Printf("%5d samples\n", shm->samples);
124 Con_Printf("%5d samplepos\n", shm->samplepos);
125 Con_Printf("%5d samplebits\n", shm->samplebits);
126 Con_Printf("%5d speed\n", shm->speed);
127 Con_Printf("0x%x dma buffer\n", shm->buffer);
128 Con_Printf("%5d total_channels\n", total_channels);
131 void S_UnloadSounds(void)
134 for (i = 0;i < num_sfx;i++)
135 S_UnloadSound(known_sfx + i);
138 void S_LoadSounds(void)
141 for (i = 0;i < num_sfx;i++)
142 S_LoadSound(known_sfx + i, false);
147 if (!snd_initialized.integer)
151 memset((void *)shm, 0, sizeof(*shm));
153 // create a piece of DMA memory
157 shm->samplebits = 16;
160 shm->samples = 32768;
162 shm->buffer = Mem_Alloc(snd_mempool, shm->channels * shm->samples * (shm->samplebits / 8));
168 Con_Printf("S_Startup: SNDDMA_Init failed.\n");
177 Con_DPrintf("Sound sampling rate: %i\n", shm->speed);
181 S_StopAllSounds(true);
184 void S_Shutdown(void)
192 Mem_Free(shm->buffer);
200 void S_Restart_f(void)
213 Con_DPrintf("\nSound Initialization\n");
215 S_RawSamples_ClearQueue();
217 Cvar_RegisterVariable(&volume);
218 Cvar_RegisterVariable(&bgmvolume);
219 Cvar_RegisterVariable(&snd_staticvolume);
221 if (COM_CheckParm("-nosound") || COM_CheckParm("-safe"))
224 snd_mempool = Mem_AllocPool("sound");
226 if (COM_CheckParm("-simsound"))
229 Cmd_AddCommand("play", S_Play);
230 Cmd_AddCommand("play2", S_Play2);
231 Cmd_AddCommand("playvol", S_PlayVol);
232 Cmd_AddCommand("stopsound", S_StopAllSoundsC);
233 Cmd_AddCommand("soundlist", S_SoundList);
234 Cmd_AddCommand("soundinfo", S_SoundInfo_f);
235 Cmd_AddCommand("snd_restart", S_Restart_f);
237 Cvar_RegisterVariable(&nosound);
238 Cvar_RegisterVariable(&snd_precache);
239 Cvar_RegisterVariable(&snd_initialized);
240 Cvar_RegisterVariable(&bgmbuffer);
241 Cvar_RegisterVariable(&ambient_level);
242 Cvar_RegisterVariable(&ambient_fade);
243 Cvar_RegisterVariable(&snd_noextraupdate);
244 Cvar_RegisterVariable(&snd_show);
245 Cvar_RegisterVariable(&_snd_mixahead);
246 Cvar_RegisterVariable(&snd_swapstereo); // LordHavoc: for people with backwards sound wiring
248 Cvar_SetValueQuick(&snd_initialized, true);
250 known_sfx = Mem_Alloc(snd_mempool, MAX_SFX*sizeof(sfx_t));
253 SND_InitScaletable ();
255 ambient_sfx[AMBIENT_WATER] = S_PrecacheSound ("ambience/water1.wav", false);
256 ambient_sfx[AMBIENT_SKY] = S_PrecacheSound ("ambience/wind2.wav", false);
258 total_channels = MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS; // no statics
259 memset(channels, 0, MAX_CHANNELS * sizeof(channel_t));
263 // =======================================================================
265 // =======================================================================
273 sfx_t *S_GetCached (const char *name)
277 if (!snd_initialized.integer)
281 Host_Error("S_IsCached: NULL\n");
283 if (strlen(name) >= MAX_QPATH)
284 Host_Error("Sound name too long: %s", name);
286 for(i = 0;i < num_sfx;i++)
287 if(!strcmp(known_sfx[i].name, name))
288 return &known_sfx[i];
299 sfx_t *S_FindName (char *name)
304 if (!snd_initialized.integer)
308 Host_Error("S_FindName: NULL\n");
310 if (strlen(name) >= MAX_QPATH)
311 Host_Error("Sound name too long: %s", name);
313 // see if already loaded
314 for (i = 0;i < num_sfx;i++)
315 if (!strcmp(known_sfx[i].name, name))
316 return &known_sfx[i];
318 if (num_sfx == MAX_SFX)
319 Sys_Error("S_FindName: out of sfx_t");
321 sfx = &known_sfx[num_sfx++];
322 memset(sfx, 0, sizeof(*sfx));
323 snprintf(sfx->name, sizeof(sfx->name), "%s", name);
334 void S_TouchSound (char *name)
345 sfx_t *S_PrecacheSound (char *name, int complain)
349 if (!snd_initialized.integer)
352 sfx = S_FindName(name);
354 if (!nosound.integer && snd_precache.integer)
355 S_LoadSound(sfx, complain);
361 //=============================================================================
368 channel_t *SND_PickChannel(int entnum, int entchannel)
374 // Check for replacement sound, or find the best one to replace
376 life_left = 0x7fffffff;
377 for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++)
379 if (entchannel != 0 // channel 0 never overrides
380 && channels[ch_idx].entnum == entnum
381 && (channels[ch_idx].entchannel == entchannel || entchannel == -1) )
382 { // always override sound from same entity
383 first_to_die = ch_idx;
387 // don't let monster sounds override player sounds
388 if (channels[ch_idx].entnum == cl.viewentity && entnum != cl.viewentity && channels[ch_idx].sfx)
391 if (channels[ch_idx].end - paintedtime < life_left)
393 life_left = channels[ch_idx].end - paintedtime;
394 first_to_die = ch_idx;
398 if (first_to_die == -1)
401 if (channels[first_to_die].sfx)
402 channels[first_to_die].sfx = NULL;
404 return &channels[first_to_die];
412 void SND_Spatialize(channel_t *ch, int isstatic)
414 vec_t dist, scale, pan;
417 // anything coming from the view entity will always be full volume
418 // LordHavoc: make sounds with ATTN_NONE have no spatialization
419 if (ch->entnum == cl.viewentity || ch->dist_mult == 0)
421 ch->leftvol = ch->master_vol;
422 ch->rightvol = ch->master_vol;
426 // update sound origin if we know about the entity
427 if (ch->entnum > 0 && cls.state == ca_connected && cl_entities[ch->entnum].state_current.active)
429 //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]);
430 VectorCopy(cl_entities[ch->entnum].state_current.origin, ch->origin);
431 if (cl_entities[ch->entnum].state_current.modelindex && cl.model_precache[cl_entities[ch->entnum].state_current.modelindex]->soundfromcenter)
432 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);
435 // calculate stereo seperation and distance attenuation
436 VectorSubtract(ch->origin, listener_vieworigin, source_vec);
437 dist = VectorNormalizeLength(source_vec);
439 scale = ch->master_vol * (1.0 - (dist * ch->dist_mult));
441 pan = scale * DotProduct(listener_viewleft, source_vec);
442 // calculate the volumes
443 ch->leftvol = (int) (scale + pan);
444 ch->rightvol = (int) (scale - pan);
447 // LordHavoc: allow adjusting volume of static sounds
450 ch->leftvol *= snd_staticvolume.value;
451 ch->rightvol *= snd_staticvolume.value;
455 ch->leftvol = bound(0, ch->leftvol, 255);
456 ch->rightvol = bound(0, ch->rightvol, 255);
460 // =======================================================================
461 // Start a sound effect
462 // =======================================================================
464 void S_StartSound(int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation)
466 channel_t *target_chan, *check;
472 if (!sound_started || !sfx || nosound.integer)
477 // pick a channel to play on
478 target_chan = SND_PickChannel(entnum, entchannel);
483 memset (target_chan, 0, sizeof(*target_chan));
484 VectorCopy(origin, target_chan->origin);
485 target_chan->dist_mult = attenuation / sound_nominal_clip_dist;
486 target_chan->master_vol = vol;
487 target_chan->entnum = entnum;
488 target_chan->entchannel = entchannel;
489 SND_Spatialize(target_chan, false);
491 // LordHavoc: spawn the sound anyway because the player might teleport to it
492 //if (!target_chan->leftvol && !target_chan->rightvol)
493 // return; // not audible at all
496 sc = S_LoadSound (sfx, true);
499 target_chan->sfx = NULL;
500 return; // couldn't load the sound's data
503 target_chan->sfx = sfx;
504 target_chan->pos = 0.0;
505 target_chan->end = paintedtime + sc->length;
507 // if an identical sound has also been started this frame, offset the pos
508 // a bit to keep it from just making the first one louder
509 check = &channels[NUM_AMBIENTS];
510 for (ch_idx=NUM_AMBIENTS ; ch_idx < NUM_AMBIENTS + MAX_DYNAMIC_CHANNELS ; ch_idx++, check++)
512 if (check == target_chan)
514 if (check->sfx == sfx && !check->pos)
516 // LordHavoc: fixed skip calculations
517 skip = 0.1 * sc->speed;
518 if (skip > sc->length)
521 skip = rand() % skip;
522 target_chan->pos += skip;
523 target_chan->end -= skip;
529 void S_StopSound(int entnum, int entchannel)
533 for (i=0 ; i<MAX_DYNAMIC_CHANNELS ; i++)
535 if (channels[i].entnum == entnum
536 && channels[i].entchannel == entchannel)
539 channels[i].sfx = NULL;
545 void S_StopAllSounds(qboolean clear)
547 total_channels = MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS; // no statics
548 memset(channels, 0, MAX_CHANNELS * sizeof(channel_t));
554 void S_StopAllSoundsC(void)
556 S_StopAllSounds(true);
559 void S_ClearBuffer(void)
563 if (!sound_started || !shm)
566 if (shm->samplebits == 8)
581 while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &pData, &dwSize, NULL, NULL, 0)) != DS_OK)
583 if (hresult != DSERR_BUFFERLOST)
585 Con_Printf ("S_ClearBuffer: DS::Lock Sound Buffer Failed\n");
592 Con_Printf ("S_ClearBuffer: DS: couldn't restore buffer\n");
598 memset(pData, clear, shm->samples * shm->samplebits/8);
600 pDSBuf->lpVtbl->Unlock(pDSBuf, pData, dwSize, NULL, 0);
607 int setsize = shm->samples * shm->samplebits / 8;
608 char *buf = shm->buffer;
613 // on i586/i686 optimized versions of glibc, glibc *wrongly* IMO,
614 // reads the memory area before writing to it causing a seg fault
615 // since the memory is PROT_WRITE only and not PROT_READ|PROT_WRITE
616 // memset(shm->buffer, clear, shm->samples * shm->samplebits/8);
626 void S_StaticSound (sfx_t *sfx, vec3_t origin, float vol, float attenuation)
634 if (total_channels == MAX_CHANNELS)
636 Con_Printf ("total_channels == MAX_CHANNELS\n");
640 sc = S_LoadSound (sfx, true);
644 if (sc->loopstart == -1)
645 Con_DPrintf("Quake compatibility warning: Static sound \"%s\" is not looped\n", sfx->name);
647 ss = &channels[total_channels++];
648 memset(ss, 0, sizeof(*ss));
649 ss->forceloop = true;
651 VectorCopy (origin, ss->origin);
652 ss->master_vol = vol;
653 ss->dist_mult = (attenuation/64) / sound_nominal_clip_dist;
654 ss->end = paintedtime + sc->length;
656 SND_Spatialize (ss, true);
660 //=============================================================================
664 S_UpdateAmbientSounds
667 void S_UpdateAmbientSounds (void)
672 qbyte ambientlevels[NUM_AMBIENTS];
674 // LordHavoc: kill ambient sounds until proven otherwise
675 for (ambient_channel = 0 ; ambient_channel < NUM_AMBIENTS;ambient_channel++)
676 channels[ambient_channel].sfx = NULL;
678 if (!snd_ambient || ambient_level.value <= 0 || !cl.worldmodel || !cl.worldmodel->brush.AmbientSoundLevelsForPoint)
681 cl.worldmodel->brush.AmbientSoundLevelsForPoint(cl.worldmodel, listener_vieworigin, ambientlevels, sizeof(ambientlevels));
683 // calc ambient sound levels
684 for (ambient_channel = 0 ; ambient_channel< NUM_AMBIENTS ; ambient_channel++)
686 if (ambient_sfx[ambient_channel] && ambient_sfx[ambient_channel]->silentlymissing)
688 chan = &channels[ambient_channel];
689 chan->forceloop = true;
690 chan->sfx = ambient_sfx[ambient_channel];
692 vol = ambient_level.value * ambientlevels[ambient_channel];
696 // don't adjust volume too fast
697 if (chan->master_vol < vol)
699 chan->master_vol += host_realframetime * ambient_fade.value;
700 if (chan->master_vol > vol)
701 chan->master_vol = vol;
703 else if (chan->master_vol > vol)
705 chan->master_vol -= host_realframetime * ambient_fade.value;
706 if (chan->master_vol < vol)
707 chan->master_vol = vol;
710 chan->leftvol = chan->rightvol = chan->master_vol;
719 Called once each time through the main loop
722 void S_Update(vec3_t origin, vec3_t forward, vec3_t left, vec3_t up)
729 if (!snd_initialized.integer || (snd_blocked > 0))
732 VectorCopy(origin, listener_vieworigin);
733 VectorCopy(forward, listener_viewforward);
734 VectorCopy(left, listener_viewleft);
735 VectorCopy(up, listener_viewup);
737 // update general area ambient sound sources
738 S_UpdateAmbientSounds ();
742 // update spatialization for static and dynamic sounds
743 ch = channels+NUM_AMBIENTS;
744 for (i=NUM_AMBIENTS ; i<total_channels; i++, ch++)
748 SND_Spatialize(ch, i >= MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS); // respatialize channel
749 if (!ch->leftvol && !ch->rightvol)
752 // try to combine static sounds with a previous channel of the same
753 // sound effect so we don't mix five torches every frame
755 if (i > MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS)
757 // see if it can just use the last one
758 if (combine && combine->sfx == ch->sfx)
760 combine->leftvol += ch->leftvol;
761 combine->rightvol += ch->rightvol;
762 ch->leftvol = ch->rightvol = 0;
766 combine = channels+MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS;
767 for (j=MAX_DYNAMIC_CHANNELS + NUM_AMBIENTS ; j<i; j++, combine++)
768 if (combine->sfx == ch->sfx)
771 if (j == total_channels)
777 combine->leftvol += ch->leftvol;
778 combine->rightvol += ch->rightvol;
779 ch->leftvol = ch->rightvol = 0;
789 if (snd_show.integer)
793 for (i=0 ; i<total_channels; i++, ch++)
794 if (ch->sfx && (ch->leftvol || ch->rightvol) )
797 Con_Printf ("----(%i)----\n", total);
804 void GetSoundtime(void)
808 static int oldsamplepos;
811 fullsamples = shm->samples / shm->channels;
813 // it is possible to miscount buffers if it has wrapped twice between
814 // calls to S_Update. Oh well.
816 soundtime = SNDDMA_GetSamples();
818 samplepos = SNDDMA_GetDMAPos();
821 if (samplepos < oldsamplepos)
823 buffers++; // buffer wrapped
825 if (paintedtime > 0x40000000)
826 { // time to chop things off to avoid 32 bit limits
828 paintedtime = fullsamples;
829 S_StopAllSounds (true);
832 oldsamplepos = samplepos;
834 soundtime = buffers*fullsamples + samplepos/shm->channels;
838 void IN_Accumulate (void);
840 void S_ExtraUpdate (void)
847 if (snd_noextraupdate.integer)
848 return; // don't pollute timings
857 if (!sound_started || (snd_blocked > 0))
863 // check to make sure that we haven't overshot
864 if (paintedtime < soundtime)
865 paintedtime = soundtime;
867 // mix ahead of current position
868 endtime = soundtime + _snd_mixahead.value * shm->speed;
869 samps = shm->samples >> (shm->channels-1);
870 if (endtime > (unsigned int)(soundtime + samps))
871 endtime = soundtime + samps;
874 // if the buffer was lost or stopped, restore it and/or restart it
880 if (pDSBuf->lpVtbl->GetStatus (pDSBuf, &dwStatus) != DD_OK)
881 Con_Printf ("Couldn't get sound buffer status\n");
883 if (dwStatus & DSBSTATUS_BUFFERLOST)
884 pDSBuf->lpVtbl->Restore (pDSBuf);
886 if (!(dwStatus & DSBSTATUS_PLAYING))
887 pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);
892 S_PaintChannels (endtime);
898 ===============================================================================
902 ===============================================================================
905 static void S_Play_Common(float fvol, float attenuation)
914 if (!strrchr(Cmd_Argv(i), '.'))
915 snprintf(name, sizeof(name), "%s.wav", Cmd_Argv(i));
917 strlcpy(name, Cmd_Argv(i), sizeof(name));
918 sfx = S_PrecacheSound(name, true);
920 // If we need to get the volume from the command line
923 fvol = atof(Cmd_Argv(i+1));
929 S_StartSound(-1, 0, sfx, listener_vieworigin, fvol, attenuation);
935 S_Play_Common (1.0f, 1.0f);
940 S_Play_Common (1.0f, 0.0f);
945 S_Play_Common (-1.0f, 0.0f);
948 void S_SoundList(void)
956 for (sfx=known_sfx, i=0 ; i<num_sfx ; i++, sfx++)
961 size = sc->length*sc->width*(sc->stereo+1);
963 Con_Printf("%c(%2db) %6i : %s\n", sc->loopstart >= 0 ? 'L' : ' ',sc->width*8, size, sfx->name);
966 Con_Printf("Total resident: %i\n", total);
970 void S_LocalSound (char *sound)
974 if (!snd_initialized.integer || nosound.integer)
977 sfx = S_PrecacheSound (sound, true);
980 Con_Printf ("S_LocalSound: can't precache %s\n", sound);
983 S_StartSound (cl.viewentity, -1, sfx, vec3_origin, 1, 1);
987 void S_ClearPrecache (void)
992 void S_BeginPrecaching (void)
997 void S_EndPrecaching (void)
1002 #define RAWSAMPLESBUFFER 32768
1003 short s_rawsamplesbuffer[RAWSAMPLESBUFFER * 2];
1004 int s_rawsamplesbuffer_start;
1005 int s_rawsamplesbuffer_count;
1007 void S_RawSamples_Enqueue(short *samples, unsigned int length)
1010 //Con_Printf("S_RawSamples_Enqueue: %i samples\n", length);
1011 if (s_rawsamplesbuffer_count + length > RAWSAMPLESBUFFER)
1013 b2 = (s_rawsamplesbuffer_start + s_rawsamplesbuffer_count) % RAWSAMPLESBUFFER;
1014 if (b2 + length > RAWSAMPLESBUFFER)
1016 b3 = (b2 + length) % RAWSAMPLESBUFFER;
1017 memcpy(s_rawsamplesbuffer + b2 * 2, samples, (RAWSAMPLESBUFFER - b2) * sizeof(short[2]));
1018 memcpy(s_rawsamplesbuffer, samples + (RAWSAMPLESBUFFER - b2) * 2, b3 * sizeof(short[2]));
1021 memcpy(s_rawsamplesbuffer + b2 * 2, samples, length * sizeof(short[2]));
1022 s_rawsamplesbuffer_count += length;
1025 void S_RawSamples_Dequeue(int *samples, unsigned int length)
1033 if (l > s_rawsamplesbuffer_count)
1034 l = s_rawsamplesbuffer_count;
1035 b1 = (s_rawsamplesbuffer_start) % RAWSAMPLESBUFFER;
1036 if (b1 + l > RAWSAMPLESBUFFER)
1038 b2 = (b1 + l) % RAWSAMPLESBUFFER;
1039 //memcpy(samples, s_rawsamplesbuffer + b1 * 2, (RAWSAMPLESBUFFER - b1) * sizeof(short[2]));
1040 //memcpy(samples + (RAWSAMPLESBUFFER - b1) * 2, s_rawsamplesbuffer, b2 * sizeof(short[2]));
1041 for (out = samples, in = s_rawsamplesbuffer + b1 * 2, count = (RAWSAMPLESBUFFER - b1) * 2, i = 0;i < count;i++)
1043 for (out = samples + (RAWSAMPLESBUFFER - b1) * 2, in = s_rawsamplesbuffer, count = b2 * 2, i = 0;i < count;i++)
1045 //Con_Printf("S_RawSamples_Dequeue: buffer wrap %i %i\n", (RAWSAMPLESBUFFER - b1), b2);
1049 //memcpy(samples, s_rawsamplesbuffer + b1 * 2, l * sizeof(short[2]));
1050 for (out = samples, in = s_rawsamplesbuffer + b1 * 2, count = l * 2, i = 0;i < count;i++)
1052 //Con_Printf("S_RawSamples_Dequeue: normal %i\n", l);
1054 if (l < (int)length)
1056 memset(samples + l * 2, 0, (length - l) * sizeof(int[2]));
1057 //Con_Printf("S_RawSamples_Dequeue: padding with %i samples\n", length - l);
1059 s_rawsamplesbuffer_start = (s_rawsamplesbuffer_start + l) % RAWSAMPLESBUFFER;
1060 s_rawsamplesbuffer_count -= l;
1063 void S_RawSamples_ClearQueue(void)
1065 s_rawsamplesbuffer_count = 0;
1066 s_rawsamplesbuffer_start = 0;
1069 int S_RawSamples_QueueWantsMore(void)
1071 if (shm != NULL && s_rawsamplesbuffer_count < min(shm->speed >> 1, RAWSAMPLESBUFFER >> 1))
1072 return RAWSAMPLESBUFFER - s_rawsamplesbuffer_count;
1077 void S_ResampleBuffer16Stereo(short *input, int inputlength, short *output, int outputlength)
1079 if (inputlength != outputlength)
1081 int i, position, stopposition, step;
1083 step = (float) inputlength * 256.0f / (float) outputlength;
1085 stopposition = (inputlength - 1) << 8;
1087 for (i = 0;i < outputlength && position < stopposition;i++, position += step)
1089 in = input + ((position >> 8) << 1);
1090 out[0] = (((in[1] - in[0]) * (position & 255)) >> 8) + in[0];
1091 out[1] = (((in[3] - in[2]) * (position & 255)) >> 8) + in[2];
1094 stopposition = inputlength << 8;
1095 for (i = 0;i < outputlength && position < stopposition;i++, position += step)
1097 in = input + ((position >> 8) << 1);
1104 memcpy(output, input, inputlength * sizeof(short[2]));
1107 int S_RawSamples_SampleRate(void)
1109 return shm != NULL ? shm->speed : 0;