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Adds support for decoding stereo streams with a mono decoder

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We don't allow *encoding* a stereo stream with a mono encoder
because that's just silly.
This commit is contained in:
Jean-Marc Valin 2011-03-28 01:39:41 -04:00
parent c914f5ea50
commit 9dec74d98d
1 changed files with 27 additions and 26 deletions
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53
libcelt/celt.c
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@ -1897,10 +1897,10 @@ struct CELTDecoder {
celt_sig _decode_mem[1]; /* Size = channels*(DECODE_BUFFER_SIZE+mode->overlap) */
/* celt_word16 lpc[], Size = channels*LPC_ORDER */
/* celt_word16 oldEBands[], Size = channels*mode->nbEBands */
/* celt_word16 oldLogE[], Size = channels*mode->nbEBands */
/* celt_word16 oldLogE2[], Size = channels*mode->nbEBands */
/* celt_word16 backgroundLogE[], Size = channels*mode->nbEBands */
/* celt_word16 oldEBands[], Size = 2*mode->nbEBands */
/* celt_word16 oldLogE[], Size = 2*mode->nbEBands */
/* celt_word16 oldLogE2[], Size = 2*mode->nbEBands */
/* celt_word16 backgroundLogE[], Size = 2*mode->nbEBands */
};
int celt_decoder_get_size(int channels)
@ -1914,7 +1914,7 @@ int celt_decoder_get_size_custom(const CELTMode *mode, int channels)
int size = sizeof(struct CELTDecoder)
+ (channels*(DECODE_BUFFER_SIZE+mode->overlap)-1)*sizeof(celt_sig)
+ channels*LPC_ORDER*sizeof(celt_word16)
+ 4*channels*mode->nbEBands*sizeof(celt_word16);
+ 4*2*mode->nbEBands*sizeof(celt_word16);
return size;
}
@ -2309,10 +2309,10 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
overlap_mem[c] = decode_mem[c]+DECODE_BUFFER_SIZE;
} while (++c<CC);
lpc = (celt_word16*)(st->_decode_mem+(DECODE_BUFFER_SIZE+st->overlap)*CC);
oldBandE = lpc+CC*LPC_ORDER;
oldLogE = oldBandE + CC*st->mode->nbEBands;
oldLogE2 = oldLogE + CC*st->mode->nbEBands;
backgroundLogE = oldLogE2 + CC*st->mode->nbEBands;
oldBandE = lpc+LPC_ORDER;
oldLogE = oldBandE + 2*st->mode->nbEBands;
oldLogE2 = oldLogE + 2*st->mode->nbEBands;
backgroundLogE = oldLogE2 + 2*st->mode->nbEBands;
if (st->signalling && data!=NULL)
{
@ -2353,17 +2353,17 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
if (effEnd > st->mode->effEBands)
effEnd = st->mode->effEBands;
ALLOC(freq, CC*N, celt_sig); /**< Interleaved signal MDCTs */
ALLOC(X, CC*N, celt_norm); /**< Interleaved normalised MDCTs */
ALLOC(bandE, st->mode->nbEBands*CC, celt_ener);
ALLOC(freq, IMAX(CC,C)*N, celt_sig); /**< Interleaved signal MDCTs */
ALLOC(X, C*N, celt_norm); /**< Interleaved normalised MDCTs */
ALLOC(bandE, st->mode->nbEBands*C, celt_ener);
c=0; do
for (i=0;i<M*st->mode->eBands[st->start];i++)
X[c*N+i] = 0;
while (++c<CC);
while (++c<C);
c=0; do
for (i=M*st->mode->eBands[effEnd];i<N;i++)
X[c*N+i] = 0;
while (++c<CC);
while (++c<C);
if (data == NULL || len<=1)
{
@ -2382,11 +2382,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
dec = &_dec;
}
if (C>CC)
{
RESTORE_STACK;
return CELT_CORRUPTED_DATA;
} else if (C<CC)
if (C<CC)
{
for (i=0;i<st->mode->nbEBands;i++)
oldBandE[i]=MAX16(oldBandE[i],oldBandE[st->mode->nbEBands+i]);
@ -2522,7 +2518,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
fine_quant, fine_priority, len*8-ec_tell(dec), dec, C);
if (anti_collapse_on)
anti_collapse(st->mode, X, collapse_masks, LM, C, CC, N,
anti_collapse(st->mode, X, collapse_masks, LM, C, C, N,
st->start, st->end, oldBandE, oldLogE, oldLogE2, pulses, st->rng);
log2Amp(st->mode, st->start, st->end, bandE, oldBandE, C);
@ -2563,6 +2559,11 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
for (i=0;i<N;i++)
freq[N+i] = freq[i];
}
if (CC==1&&C==2)
{
for (i=0;i<N;i++)
freq[i] = HALF32(ADD32(freq[i],freq[N+i]));
}
/* Compute inverse MDCTs */
compute_inv_mdcts(st->mode, shortBlocks, freq, out_syn, overlap_mem, CC, LM);
@ -2594,7 +2595,7 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
}
#endif /* ENABLE_POSTFILTER */
if (CC==2&&C==1) {
if (C==1) {
for (i=0;i<st->mode->nbEBands;i++)
oldBandE[st->mode->nbEBands+i]=oldBandE[i];
}
@ -2606,17 +2607,17 @@ int celt_decode_with_ec_float(CELTDecoder * restrict st, const unsigned char *da
oldBandE[c*st->mode->nbEBands+i]=0;
for (i=st->end;i<st->mode->nbEBands;i++)
oldBandE[c*st->mode->nbEBands+i]=0;
} while (++c<CC);
} while (++c<2);
if (!isTransient)
{
for (i=0;i<CC*st->mode->nbEBands;i++)
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE2[i] = oldLogE[i];
for (i=0;i<CC*st->mode->nbEBands;i++)
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE[i] = oldBandE[i];
for (i=0;i<CC*st->mode->nbEBands;i++)
for (i=0;i<2*st->mode->nbEBands;i++)
backgroundLogE[i] = MIN16(backgroundLogE[i] + M*QCONST16(0.001f,DB_SHIFT), oldBandE[i]);
} else {
for (i=0;i<CC*st->mode->nbEBands;i++)
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE[i] = MIN16(oldLogE[i], oldBandE[i]);
}
st->rng = dec->rng;