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More IMDCT de-uglification

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This commit is contained in:
Jean-Marc Valin 2010-08-27 01:32:40 -04:00
parent e0ce2cf99d
commit f67b4476a0
2 changed files with 20 additions and 20 deletions
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38
libcelt/celt.c
View file

@ -353,52 +353,47 @@ static void compute_inv_mdcts(const CELTMode *mode, int shortBlocks, celt_sig *X
int b;
int N2 = N;
int B = 1;
int n4offset=0;
SAVE_STACK;
ALLOC(x, 2*N, celt_word32);
ALLOC(x, N+overlap, celt_word32);
ALLOC(tmp, N, celt_word32);
if (shortBlocks)
{
/*lookup = &mode->mdct[0];*/
N2 = mode->shortMdctSize;
B = shortBlocks;
n4offset = N4;
}
/* Prevents problems from the imdct doing the overlap-add */
CELT_MEMSET(x+N4, 0, N2);
CELT_MEMSET(x, 0, overlap);
for (b=0;b<B;b++)
{
/* De-interleaving the sub-frames */
for (j=0;j<N2;j++)
tmp[j] = X[(j*B+b)+c*N2*B];
clt_mdct_backward(&mode->mdct, tmp, x+n4offset+N2*b, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM);
clt_mdct_backward(&mode->mdct, tmp, x+N2*b, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM);
}
if (transient_shift > 0)
{
#ifdef FIXED_POINT
for (j=0;j<16;j++)
x[N4+transient_time+j-16] = MULT16_32_Q15(SHR16(Q15_ONE-transientWindow[j],transient_shift)+transientWindow[j], SHL32(x[N4+transient_time+j-16],transient_shift));
x[transient_time+j-16] = MULT16_32_Q15(SHR16(Q15_ONE-transientWindow[j],transient_shift)+transientWindow[j], SHL32(x[N4+transient_time+j-16],transient_shift));
for (j=transient_time;j<N+overlap;j++)
x[N4+j] = SHL32(x[N4+j], transient_shift);
x[j] = SHL32(x[N4+j], transient_shift);
#else
for (j=0;j<16;j++)
x[N4+transient_time+j-16] *= 1+transientWindow[j]*((1<<transient_shift)-1);
x[transient_time+j-16] *= 1+transientWindow[j]*((1<<transient_shift)-1);
for (j=transient_time;j<N+overlap;j++)
x[N4+j] *= 1<<transient_shift;
x[j] *= 1<<transient_shift;
#endif
}
/* The first and last part would need to be set to zero
if we actually wanted to use them. */
for (j=0;j<overlap;j++)
out_mem[c][MAX_PERIOD-N+j] = x[j+N4] + overlap_mem[c][j];
out_mem[c][j] = x[j] + overlap_mem[c][j];
for (;j<N;j++)
out_mem[c][MAX_PERIOD-N+j] = x[j+N4];
out_mem[c][j] = x[j];
for (j=0;j<overlap;j++)
overlap_mem[c][j] = x[N+j+N4];
overlap_mem[c][j] = x[N+j];
RESTORE_STACK;
}
}
@ -414,7 +409,7 @@ static void deemphasis(celt_sig *in[], celt_word16 *pcm, int N, int _C, const ce
celt_sig * restrict x;
celt_word16 * restrict y;
celt_sig m = mem[c];
x = &in[c][MAX_PERIOD-N];
x =in[c];
y = pcm+c;
for (j=0;j<N;j++)
{
@ -1310,7 +1305,7 @@ CELTDecoder *celt_decoder_create(const CELTMode *mode, int channels, int *error)
st->loss_count = 0;
if ((st->decode_mem!=NULL) && (st->out_mem[0]!=NULL) && (st->oldBandE!=NULL) &&
if ((st->decode_mem[0]!=NULL) && (st->oldBandE!=NULL) &&
(st->lpc!=NULL))
{
if (error)
@ -1540,6 +1535,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
VARDECL(int, offsets);
VARDECL(int, fine_priority);
VARDECL(int, tf_res);
celt_sig *out_syn[2];
int shortBlocks;
int isTransient;
@ -1689,11 +1685,15 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
for (i=M*st->mode->eBands[effEnd];i<N;i++)
freq[c*N+i] = 0;
out_syn[0] = st->out_mem[0]+MAX_PERIOD-N;
if (C==2)
out_syn[1] = st->out_mem[1]+MAX_PERIOD-N;
/* Compute inverse MDCTs */
compute_inv_mdcts(st->mode, shortBlocks, freq, transient_time,
transient_shift, st->out_mem, st->overlap_mem, C, LM);
transient_shift, out_syn, st->overlap_mem, C, LM);
deemphasis(st->out_mem, pcm, N, C, st->mode->preemph, st->preemph_memD);
deemphasis(out_syn, pcm, N, C, st->mode->preemph, st->preemph_memD);
st->loss_count = 0;
RESTORE_STACK;
if (ec_dec_get_error(dec))

2
libcelt/mdct.c
View file

@ -285,7 +285,7 @@ void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scala
fp2 -= 2;
}
}
out -= (N2-overlap)>>1;
/* Mirror on both sides for TDAC */
{
kiss_fft_scalar * restrict fp1 = f2+N4-1;