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Commit c6b4390f authored by Jean-Marc Valin's avatar Jean-Marc Valin
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Working allocation interpolation code

parent a6631746
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libcelt/rate.c
View file @ c6b4390f
......@@ -38,8 +38,11 @@
#include "entcode.h"
#define BITRES 4
#define BITROUND 8
#define BITOVERFLOW 1000
#define MAX_PULSES 64
int log2_frac(ec_uint32 val, int frac)
{
int i;
......@@ -88,7 +91,7 @@ int log2_frac64(ec_uint64 val, int frac)
return L;
}
int bits2pulses(int bits, int N)
int bits2pulses0(int bits, int N)
{
int i, b, prev;
/* FIXME: This is terribly inefficient. Do a bisection instead
......@@ -110,6 +113,7 @@ int bits2pulses(int bits, int N)
struct alloc_data {
int len;
const int *bands;
int **bits;
int **rev_bits;
};
......@@ -118,9 +122,12 @@ void alloc_init(struct alloc_data *alloc, const CELTMode *m)
{
int i, prevN, BC;
const int *eBands = m->eBands;
alloc->len = m->nbEBands;
alloc->bands = m->eBands;
alloc->bits = celt_alloc(m->nbEBands*sizeof(int*));
alloc->rev_bits = celt_alloc(m->nbEBands*sizeof(int*));
alloc->len = m->nbEBands;
BC = m->nbMdctBlocks*m->nbChannels;
prevN = -1;
for (i=0;i<alloc->len;i++)
......@@ -133,19 +140,19 @@ void alloc_init(struct alloc_data *alloc, const CELTMode *m)
} else {
int j;
/* FIXME: We could save memory here */
alloc->bits[i] = celt_alloc(64*sizeof(int));
alloc->rev_bits[i] = celt_alloc(64*sizeof(int));
for (j=0;j<64;j++)
alloc->bits[i] = celt_alloc(MAX_PULSES*sizeof(int));
alloc->rev_bits[i] = celt_alloc(MAX_PULSES*sizeof(int));
for (j=0;j<MAX_PULSES;j++)
{
alloc->bits[i][j] = log2_frac64(ncwrs64(N, j),BITRES);
/* We could just update rev_bits here */
if (alloc->bits[i][j] > (60>>BITRES))
if (alloc->bits[i][j] > (60<<BITRES))
break;
}
for (;j<64;j++)
for (;j<MAX_PULSES;j++)
alloc->bits[i][j] = BITOVERFLOW;
for (j=0;j<32;j++)
alloc->rev_bits[i][j] = bits2pulses(j, N);
alloc->rev_bits[i][j] = bits2pulses0(j, N);
prevN = N;
}
}
......@@ -191,31 +198,52 @@ int compute_allocation(const CELTMode *m, int *pulses)
return (bits+255)>>8;
}
int bits2pulses(const struct alloc_data *alloc, int band, int bits)
{
int lo, hi;
lo = 0;
hi = MAX_PULSES;
while (hi-lo != 1)
{
int mid = (lo+hi)>>1;
if (alloc->bits[band][mid] >= bits)
hi = mid;
else
lo = mid;
}
if (bits-alloc->bits[band][lo] <= alloc->bits[band][hi]-bits)
return lo;
else
return hi;
}
int vec_bits2pulses(int *bands, int *bits, int *pulses, int len, int B)
int vec_bits2pulses(const struct alloc_data *alloc, const int *bands, int *bits, int *pulses, int len, int B)
{
int i;
int sum=0;
for (i=0;i<len;i++)
{
int N = (bands[i+1]-bands[i])*B;
pulses[i] = bits2pulses(bits[i], N);
sum += log2_frac64(ncwrs(N, pulses[i]),8);
pulses[i] = bits2pulses(alloc, i, bits[i]);
sum += alloc->bits[i][pulses[i]];
}
return (sum+255)>>8;
return sum;
}
int interp_bits2pulses(int *bands, int *bits1, int *bits2, int total, int *pulses, int len, int B)
#if 0
int interp_bits2pulses(const struct alloc_data *alloc, int *bits1, int *bits2, int total, int *pulses, int len, int B)
{
int i;
const int *bands = alloc->bands;
/* FIXME: This too is terribly inefficient. We should do a bisection instead */
for (i=0;i<16;i++)
{
int j;
int bits[len];
for (j=0;j<len;j++)
bits[j] = ((16-i)*bits1[j] + i*bits2[j]) >> 4;
if (vec_bits2pulses(bands, bits, pulses, len, B) > total)
bits[j] = ((16-i)*bits1[j] + i*bits2[j]);
if (vec_bits2pulses(alloc, bands, bits, pulses, len, B) > total)
break;
}
if (i==0)
......@@ -226,10 +254,56 @@ int interp_bits2pulses(int *bands, int *bits1, int *bits2, int total, int *pulse
/* Get the previous one (that didn't bust). Should rewrite that anyway */
i--;
for (j=0;j<len;j++)
bits[j] = ((16-i)*bits1[j] + i*bits2[j]) >> 4;
return vec_bits2pulses(bands, bits, pulses, len, B);
bits[j] = ((16-i)*bits1[j] + i*bits2[j]);
return vec_bits2pulses(alloc, bands, bits, pulses, len, B);
}
}
#else
int interp_bits2pulses(const struct alloc_data *alloc, int *bits1, int *bits2, int total, int *pulses, int len, int B)
{
int lo, hi, out;
int j;
int bits[len];
int used_bits[len];
const int *bands = alloc->bands;
lo = 0;
hi = 1<<BITRES;
while (hi-lo != 1)
{
int mid = (lo+hi)>>1;
for (j=0;j<len;j++)
bits[j] = ((1<<BITRES)-mid)*bits1[j] + mid*bits2[j];
if (vec_bits2pulses(alloc, bands, bits, pulses, len, B) > total<<BITRES)
hi = mid;
else
lo = mid;
}
for (j=0;j<len;j++)
bits[j] = ((1<<BITRES)-lo)*bits1[j] + lo*bits2[j];
out = vec_bits2pulses(alloc, bands, bits, pulses, len, B);
/* Do some refinement to use up all bits */
while(1)
{
int incremented = 0;
for (j=0;j<len;j++)
{
if (alloc->bits[j][pulses[j]] < bits[j])
{
if (out+alloc->bits[j][pulses[j]+1]-alloc->bits[j][pulses[j]] <= total<<BITRES)
{
out = out+alloc->bits[j][pulses[j]+1]-alloc->bits[j][pulses[j]];
pulses[j] += 1;
incremented = 1;
}
}
}
if (!incremented)
break;
}
return (out+BITROUND) >> BITRES;
}
#endif
#if 0
int main()
......@@ -262,12 +336,12 @@ int main()
struct alloc_data alloc;
alloc_init(&alloc, celt_mode0);
int b = vec_bits2pulses(bank, bits, pulses, 18, 1);
int b = vec_bits2pulses(&alloc, bank, bits, pulses, 18, 1);
printf ("total: %d bits\n", b);
for (i=0;i<18;i++)
printf ("%d ", pulses[i]);
printf ("\n");
b = interp_bits2pulses(bank, bits1, bits2, 160, pulses, 18, 1);
b = interp_bits2pulses(&alloc, bits1, bits2, 162, pulses, 18, 1);
printf ("total: %d bits\n", b);
for (i=0;i<18;i++)
printf ("%d ", pulses[i]);
......
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