From de74e43c4a8e580338892de913d65bb5be2d927b Mon Sep 17 00:00:00 2001 From: TimeServ Date: Mon, 8 May 2006 06:44:47 +0000 Subject: [PATCH] added snd_linearresample for better quality resampling, defaults to 1 git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2253 fc73d0e0-1445-4013-8a0c-d673dee63da5 --- engine/client/snd_dma.c | 3 ++ engine/client/snd_mem.c | 81 +++++++++++++++++++++++++++++++++-------- 2 files changed, 69 insertions(+), 15 deletions(-) diff --git a/engine/client/snd_dma.c b/engine/client/snd_dma.c index db0e4c9a..6a14bbae 100644 --- a/engine/client/snd_dma.c +++ b/engine/client/snd_dma.c @@ -81,6 +81,7 @@ cvar_t snd_speakers = SCVAR("snd_numspeakers", "2"); cvar_t snd_playersoundvolume = SCVAR("snd_localvolume", "1"); //sugested by crunch cvar_t snd_capture = SCVAR("snd_capture", "0"); +cvar_t snd_linearresample = SCVAR("snd_linearresample", "1"); cvar_t snd_usemultipledevices = SCVAR("snd_multipledevices", "0"); @@ -556,6 +557,8 @@ void S_Init (void) Cvar_Register(&snd_playersoundvolume, "Sound controls"); Cvar_Register(&snd_usemultipledevices, "Sound controls"); + Cvar_Register(&snd_linearresample, "Sound controls"); + if (COM_CheckParm("-nosound")) { Cvar_ForceSet(&nosound, "1"); diff --git a/engine/client/snd_mem.c b/engine/client/snd_mem.c index d1f8c5a0..00e7fdc4 100644 --- a/engine/client/snd_mem.c +++ b/engine/client/snd_mem.c @@ -34,6 +34,7 @@ ResampleSfx */ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) { + int incount; int outcount; int srcsample; float stepscale; @@ -41,6 +42,8 @@ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) int sample, fracstep; unsigned int samplefrac; sfxcache_t *sc; + extern cvar_t snd_linearresample; + qboolean linearsampling = !!(snd_linearresample.value); sc = Cache_Check (&sfx->cache); if (!sc) @@ -48,6 +51,7 @@ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) stepscale = (float)inrate / snd_speed; // this is usually 0.5, 1, or 2 + incount = sc->length; outcount = sc->length / stepscale; sc->length = outcount; if (sc->loopstart != -1) @@ -84,12 +88,28 @@ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) for (i=0 ; i> 8; - samplefrac += fracstep; + linearsampling = linearsampling && ((srcsample+1) < incount); - if (inwidth == 2) - sample = LittleShort ( ((short *)data)[(srcsample<<1)] ); + if (linearsampling) + { + if (inwidth == 2) + sample = ((255 - (samplefrac & 0xFF)) * + LittleShort( ((short *)data)[ srcsample<<1 ] ) + + (samplefrac & 0xFF) * + LittleShort( ((short *)data)[ (srcsample+1)<<1 ] )) >> 8; + else + sample = ((255-(samplefrac & 0xFF)) * + (int)( (unsigned char)(data[ srcsample<<1 ]) - 128 ) + + (samplefrac & 0xFF) * + (int)( (unsigned char)(data[ (srcsample+1)<<1 ]) - 128 )); + } else - sample = (int)( (unsigned char)(data[(srcsample<<1)]) - 128) << 8; + { + if (inwidth == 2) + sample = LittleShort ( ((short *)data)[(srcsample<<1)] ); + else + sample = (int)( (unsigned char)(data[(srcsample<<1)]) - 128) << 8; + } if (sc->width == 2) ((short *)sc->data)[i<<1] = sample; else @@ -97,14 +117,32 @@ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) // srcsample = samplefrac >> 8; // samplefrac += fracstep; - if (inwidth == 2) - sample = LittleShort ( ((short *)data)[(srcsample<<1)+1] ); + if (linearsampling) + { + if (inwidth == 2) + sample = ((255 - (samplefrac & 0xFF)) * + LittleShort( ((short *)data)[ (srcsample<<1)+1 ] ) + + (samplefrac & 0xFF) * + LittleShort( ((short *)data)[ ((srcsample+1)<<1)+1 ] )) >> 8; + else + sample = ((255-(samplefrac & 0xFF)) * + (int)( (unsigned char)(data[ (srcsample<<1)+1 ]) - 128 ) + + (samplefrac & 0xFF) * + (int)( (unsigned char)(data[ ((srcsample+1)<<1)+1 ]) - 128 )); + } else - sample = (int)( (unsigned char)(data[(srcsample<<1)+1]) - 128) << 8; + { + if (inwidth == 2) + sample = LittleShort ( ((short *)data)[(srcsample<<1)+1] ); + else + sample = (int)( (unsigned char)(data[(srcsample<<1)+1]) - 128) << 8; + } if (sc->width == 2) ((short *)sc->data)[(i<<1)+1] = sample; else ((signed char *)sc->data)[(i<<1)+1] = sample >> 8; + + samplefrac += fracstep; } } return; @@ -133,21 +171,37 @@ void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, qbyte *data) for (i=0 ; i> 8; - samplefrac += fracstep; - if (inwidth == 2) - sample = LittleShort ( ((short *)data)[srcsample] ); + linearsampling = linearsampling && ((srcsample+1) < incount); + if (linearsampling) + { + if (inwidth == 2) + sample = ((255 - (samplefrac & 0xFF)) * + LittleShort( ((short *)data)[srcsample] ) + + (samplefrac & 0xFF) * + LittleShort( ((short *)data)[srcsample+1] )) >> 8; + else + sample = ((255-(samplefrac & 0xFF)) * + (int)( (unsigned char)(data[srcsample]) - 128 ) + + (samplefrac & 0xFF) * + (int)( (unsigned char)(data[srcsample+1]) - 128 )); + } else - sample = (int)( (unsigned char)(data[srcsample]) - 128) << 8; + { + 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; + samplefrac += fracstep; } } } //============================================================================= -#ifdef DOOMWADS // needs fine tuning.. educated guesses #define DSPK_RATE 128 #define DSPK_FREQ 31 @@ -264,7 +318,6 @@ sfxcache_t *S_LoadDoomSound (sfx_t *s, qbyte *data, int datalen, int sndspeed) return sc; } -#endif sfxcache_t *S_LoadWavSound (sfx_t *s, qbyte *data, int datalen, int sndspeed) { @@ -307,10 +360,8 @@ S_LoadSound_t AudioInputPlugins[10] = S_LoadOVSound, #endif S_LoadWavSound, -#ifdef DOOMWADS S_LoadDoomSound, S_LoadDoomSpeakerSound, -#endif }; qboolean S_RegisterSoundInputPlugin(S_LoadSound_t loadfnc)