diff options
author | jmvalin <jmvalin@0101bb08-14d6-0310-b084-bc0e0c8e3800> | 2002-04-09 09:15:42 +0400 |
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committer | jmvalin <jmvalin@0101bb08-14d6-0310-b084-bc0e0c8e3800> | 2002-04-09 09:15:42 +0400 |
commit | 1b3e0d24004b51fb66197278f3b759ba25be5401 (patch) | |
tree | 1a374136790f12a819b62d9e1c05f2dab8360a27 /libspeex | |
parent | 41eec2164e4e2edabfde0fe199fd03e2c1cb0b93 (diff) |
Fully quantized test encoder for SB-CELP at (currently) 31.3 kbps.
git-svn-id: http://svn.xiph.org/trunk/speex@3229 0101bb08-14d6-0310-b084-bc0e0c8e3800
Diffstat (limited to 'libspeex')
-rw-r--r-- | libspeex/sb_celp.c | 58 |
1 files changed, 48 insertions, 10 deletions
diff --git a/libspeex/sb_celp.c b/libspeex/sb_celp.c index ec688a0..e562a02 100644 --- a/libspeex/sb_celp.c +++ b/libspeex/sb_celp.c @@ -37,6 +37,37 @@ extern float stoc[]; #define sqr(x) ((x)*(x)) +float quant_high_gain[16]={ + -2.387860, + -1.504710, + -0.988013, + -0.610249, + -0.310298, + -0.050495, + 0.188963, + 0.413744, + 0.628971, + 0.840555, + 1.055630, + 1.283410, + 1.544990, + 1.855790, + 2.281910, + 3.002660 +}; + + +float quant_high_gain2[8] = { + -1.51541, + -0.70324, + -0.17024, + 0.26748, + 0.67232, + 1.08402, + 1.56110, + 2.25160, +}; + #if 0 #define QMF_ORDER 32 static float h0[32] = { @@ -458,8 +489,6 @@ void sb_encode(SBEncState *st, float *in, FrameBits *bits) for (i=0;i<st->subframeSize;i++) target[i]=sw[i]-res[i]; { - int ind; - float gain; #if 0 float el=0,eh=0,g; @@ -479,7 +508,7 @@ void sb_encode(SBEncState *st, float *in, FrameBits *bits) exc[i]*=g; #else - int k,N=2; + int k,N=4; float el=0,eh=0,g; int *index; float *gains; @@ -496,7 +525,7 @@ void sb_encode(SBEncState *st, float *in, FrameBits *bits) { int of=k*st->subframeSize/N; overlap_cb_search(target+of, st->interp_qlpc, st->bw_lpc1, st->bw_lpc2, - &stoc[0], 128, &gains[k], &index[k], st->lpcSize, + &stoc[0], 64, &gains[k], &index[k], st->lpcSize, st->subframeSize/N); for (i=0;i<st->subframeSize;i++) res[i]=0; @@ -520,7 +549,8 @@ void sb_encode(SBEncState *st, float *in, FrameBits *bits) for (k=0;k<N;k++) { int sign=0; - float quant; + float quant, dist, min_dist; + int best_ind; int of=k*st->subframeSize/N; gains[k]*=g; #if 1 @@ -530,14 +560,22 @@ void sb_encode(SBEncState *st, float *in, FrameBits *bits) gains[k] = -gains[k]; } quant = (1+gains[k])*filter_ratio/(1+sqrt(el/st->subframeSize)); - if (quant>10) - quant=10; - if (quant<.0001) - quant=.1; + printf ("quant_high_gain: %f\n", (float)log(quant)); + min_dist = sqr(quant-quant_high_gain2[0]); + best_ind=0; + for (i=1;i<8;i++) + { + dist = sqr(quant-quant_high_gain2[i]); + if (dist<min_dist) + { + best_ind=i; + min_dist=dist; + } + } + quant=quant_high_gain2[best_ind]; gains[k]=quant*(1+sqrt(el/st->subframeSize))/filter_ratio; if (sign) gains[k] = -gains[k]; - printf ("quant_high_gain: %f\n", quant); #endif for (i=0;i<st->subframeSize/N;i++) exc[of+i]=gains[k]*stoc[index[k]+i]; |