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added linear downsampling, use snd_linearsample 2 or snd_linearsample_stream 2 to enable

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git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@2313 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
TimeServ 2006-06-04 03:50:24 +00:00
parent 6eac4b965b
commit c6f426a52b
1 changed files with 148 additions and 13 deletions
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145
engine/client/snd_mem.c
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@ -38,7 +38,7 @@ qbyte *S_Alloc (int size);
\
while (outsamps) \
{ \
*out = ((0xFFFF - inaccum)*in[0] + inaccum*in[1]) >> (16 + outrshift); \
*out = ((0xFFFF - inaccum)*in[0] + inaccum*in[1]) >> (16 - outlshift + outrshift); \
inaccum += infrac; \
in += (inaccum >> 16); \
inaccum &= 0xFFFF; \
@ -64,8 +64,8 @@ qbyte *S_Alloc (int size);
\
while (outsamps) \
{ \
out[0] = ((0xFFFF - inaccum)*in[0] + inaccum*in[2]) >> (16 + outrshift); \
out[1] = ((0xFFFF - inaccum)*in[1] + inaccum*in[3]) >> (16 + outrshift); \
out[0] = ((0xFFFF - inaccum)*in[0] + inaccum*in[2]) >> (16 - outlshift + outrshift); \
out[1] = ((0xFFFF - inaccum)*in[1] + inaccum*in[3]) >> (16 - outlshift + outrshift); \
inaccum += infrac; \
in += (inaccum >> 16) * 2; \
inaccum &= 0xFFFF; \
@ -108,6 +108,99 @@ qbyte *S_Alloc (int size);
} \
}
#define LINEARDOWNSCALE(in, inrate, insamps, out, outrate, outlshift, outrshift) \
{ \
scale = outrate / (double)inrate; \
infrac = floor(scale * 65536); \
inaccum = 0; \
insamps--; \
outsampleft = 0; \
\
while (insamps) \
{ \
inaccum += infrac; \
if (inaccum >> 16) \
{ \
inaccum &= 0xFFFF; \
outsampleft += (infrac - inaccum) * (*in); \
*out = outsampleft >> (16 - outlshift + outrshift); \
out++; \
outsampleft = inaccum * (*in); \
} \
else \
outsampleft += infrac * (*in); \
in++; \
insamps--; \
} \
outsampleft += (0xFFFF - inaccum) * (*in);\
*out = outsampleft >> (16 - outlshift + outrshift); \
}
#define LINEARDOWNSCALESTEREO(in, inrate, insamps, out, outrate, outlshift, outrshift) \
{ \
scale = outrate / (double)inrate; \
infrac = floor(scale * 65536); \
inaccum = 0; \
insamps--; \
outsampleft = 0; \
outsampright = 0; \
\
while (insamps) \
{ \
inaccum += infrac; \
if (inaccum >> 16) \
{ \
inaccum &= 0xFFFF; \
outsampleft += (infrac - inaccum) * in[0]; \
outsampright += (infrac - inaccum) * in[1]; \
out[0] = outsampleft >> (16 - outlshift + outrshift); \
out[1] = outsampright >> (16 - outlshift + outrshift); \
out += 2; \
outsampleft = inaccum * in[0]; \
outsampright = inaccum * in[1]; \
} \
else \
{ \
outsampleft += infrac * in[0]; \
outsampright += infrac * in[1]; \
} \
in += 2; \
insamps--; \
} \
outsampleft += (0xFFFF - inaccum) * in[0];\
outsampright += (0xFFFF - inaccum) * in[1];\
out[0] = outsampleft >> (16 - outlshift + outrshift); \
out[1] = outsampright >> (16 - outlshift + outrshift); \
}
#define LINEARDOWNSCALESTEREOTOMONO(in, inrate, insamps, out, outrate, outlshift, outrshift) \
{ \
scale = outrate / (double)inrate; \
infrac = floor(scale * 65536); \
inaccum = 0; \
insamps--; \
outsampleft = 0; \
\
while (insamps) \
{ \
inaccum += infrac; \
if (inaccum >> 16) \
{ \
inaccum &= 0xFFFF; \
outsampleft += (infrac - inaccum) * ((in[0] + in[1]) >> 1); \
*out = outsampleft >> (16 - outlshift + outrshift); \
out++; \
outsampleft = inaccum * ((in[0] + in[1]) >> 1); \
} \
else \
outsampleft += infrac * ((in[0] + in[1]) >> 1); \
in += 2; \
insamps--; \
} \
outsampleft += (0xFFFF - inaccum) * ((in[0] + in[1]) >> 1);\
*out = outsampleft >> (16 - outlshift + outrshift); \
}
#define STANDARDRESCALE(in, inrate, insamps, out, outrate, outlshift, outrshift) \
{ \
scale = inrate / (double)outrate; \
@ -186,7 +279,7 @@ qbyte *S_Alloc (int size);
}
// SND_ResampleStream: takes a sound stream and converts with given parameters. Limited to
// 8-16-bit signed conversions and mono-to-mono/stereo-to-stereo/stereo-to-mono conversions.
// 8-16-bit signed conversions and mono-to-mono/stereo-to-stereo conversions.
// Not an in-place algorithm.
void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int insamps, void *out, int outrate, int outwidth, int outchannels, int resampstyle)
{
@ -195,7 +288,7 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
short *in16 = (short *)in;
signed char *out8 = (signed char *)out;
short *out16 = (short *)out;
int outsamps, outnlsamps;
int outsamps, outnlsamps, outsampleft, outsampright;
int infrac, inaccum;
if (insamps <= 0)
@ -221,7 +314,12 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALE(in8, inrate, insamps, out8, outrate, 0, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALE(in8, inrate, insamps, out8, outrate, 0, 0)
else
STANDARDRESCALE(in8, inrate, insamps, out8, outrate, 0, 0)
}
return;
}
else
@ -236,7 +334,12 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALE(in8, inrate, insamps, out16, outrate, 8, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALE(in8, inrate, insamps, out16, outrate, 8, 0)
else
STANDARDRESCALE(in8, inrate, insamps, out16, outrate, 8, 0)
}
return;
}
}
@ -252,7 +355,12 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALE(in16, inrate, insamps, out16, outrate, 0, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALE(in16, inrate, insamps, out16, outrate, 0, 0)
else
STANDARDRESCALE(in16, inrate, insamps, out16, outrate, 0, 0)
}
return;
}
else
@ -267,7 +375,12 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALE(in16, inrate, insamps, out8, outrate, 0, 8)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALE(in16, inrate, insamps, out8, outrate, 0, 8)
else
STANDARDRESCALE(in16, inrate, insamps, out8, outrate, 0, 8)
}
return;
}
}
@ -286,8 +399,13 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALESTEREO(in8, inrate, insamps, out8, outrate, 0, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALESTEREO(in8, inrate, insamps, out8, outrate, 0, 0)
else
STANDARDRESCALESTEREO(in8, inrate, insamps, out8, outrate, 0, 0)
}
}
else
{
if (inrate == outrate) // quick convert
@ -303,9 +421,14 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALESTEREO(in8, inrate, insamps, out16, outrate, 8, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALESTEREO(in8, inrate, insamps, out16, outrate, 8, 0)
else
STANDARDRESCALESTEREO(in8, inrate, insamps, out16, outrate, 8, 0)
}
}
}
else // 16-bit
{
if (outwidth == 2)
@ -318,8 +441,13 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALESTEREO(in16, inrate, insamps, out16, outrate, 0, 0)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALESTEREO(in16, inrate, insamps, out16, outrate, 0, 0)
else
STANDARDRESCALESTEREO(in16, inrate, insamps, out16, outrate, 0, 0)
}
}
else
{
if (inrate == outrate) // quick convert
@ -335,10 +463,16 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
STANDARDRESCALESTEREO(in16, inrate, insamps, out8, outrate, 0, 8)
}
else // downsample
{
if (resampstyle > 1)
LINEARDOWNSCALESTEREO(in16, inrate, insamps, out8, outrate, 0, 8)
else
STANDARDRESCALESTEREO(in16, inrate, insamps, out8, outrate, 0, 8)
}
}
}
}
#if 0
else if (outchannels == 1 && inchannels == 2)
{
if (inwidth == 1)
@ -400,6 +534,7 @@ void SND_ResampleStream (void *in, int inrate, int inwidth, int inchannels, int
}
}
}
#endif
}
/*