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Moves the remains of compute_inv_mdcts() to celt_synthesis()

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This commit is contained in:
Jean-Marc Valin 2014-01-06 09:31:09 -05:00
parent 32454dcadc
commit 14ca4ed682
1 changed files with 24 additions and 37 deletions
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61
celt/celt_decoder.c
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@ -257,35 +257,6 @@ void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, c
RESTORE_STACK;
}
/** Compute the IMDCT and apply window for all sub-frames and
all channels in a frame */
#ifndef RESYNTH
static
#endif
void compute_inv_mdcts(const CELTMode *mode, int shortBlocks, celt_sig *X,
celt_sig * OPUS_RESTRICT out_mem, int LM)
{
int b;
int B;
int N;
int shift;
const int overlap = mode->overlap;
if (shortBlocks)
{
B = shortBlocks;
N = mode->shortMdctSize;
shift = mode->maxLM;
} else {
B = 1;
N = mode->shortMdctSize<<LM;
shift = mode->maxLM-LM;
}
/* IMDCT on the interleaved the sub-frames, overlap-add is performed by the IMDCT */
for (b=0;b<B;b++)
clt_mdct_backward(&mode->mdct, &X[b], out_mem+N*b, mode->window, overlap, shift, B);
}
#ifndef RESYNTH
static
#endif
@ -294,9 +265,12 @@ void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
int LM, int downsample, int silence)
{
int c, i;
int M, N;
int M;
int b;
int B;
int N, NB;
int shift;
int nbEBands;
int shortBlocks;
int overlap;
VARDECL(celt_sig, freq);
SAVE_STACK;
@ -306,7 +280,17 @@ void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
N = mode->shortMdctSize<<LM;
ALLOC(freq, N, celt_sig); /**< Interleaved signal MDCTs */
M = 1<<LM;
shortBlocks = isTransient ? M : 0;
if (isTransient)
{
B = M;
NB = mode->shortMdctSize;
shift = mode->maxLM;
} else {
B = 1;
NB = mode->shortMdctSize<<LM;
shift = mode->maxLM-LM;
}
if (CC==2&&C==1)
{
@ -317,8 +301,10 @@ void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
/* Store a temporary copy in the output buffer because the IMDCT destroys its input. */
freq2 = out_syn[1]+overlap/2;
OPUS_COPY(freq2, freq, N);
compute_inv_mdcts(mode, shortBlocks, freq2, out_syn[0], LM);
compute_inv_mdcts(mode, shortBlocks, freq, out_syn[1], LM);
for (b=0;b<B;b++)
clt_mdct_backward(&mode->mdct, &freq2[b], out_syn[0]+NB*b, mode->window, overlap, shift, B);
for (b=0;b<B;b++)
clt_mdct_backward(&mode->mdct, &freq[b], out_syn[1]+NB*b, mode->window, overlap, shift, B);
} else if (CC==1&&C==2)
{
/* Downmixing a stereo stream to mono */
@ -331,14 +317,15 @@ void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
downsample, silence);
for (i=0;i<N;i++)
freq[i] = HALF32(ADD32(freq[i],freq2[i]));
/* Compute inverse MDCTs */
compute_inv_mdcts(mode, shortBlocks, freq, out_syn[0], LM);
for (b=0;b<B;b++)
clt_mdct_backward(&mode->mdct, &freq[b], out_syn[0]+NB*b, mode->window, overlap, shift, B);
} else {
/* Normal case (mono or stereo) */
c=0; do {
denormalise_bands(mode, X+c*N, freq, oldBandE+c*nbEBands, start, effEnd, M,
downsample, silence);
compute_inv_mdcts(mode, shortBlocks, freq, out_syn[c], LM);
for (b=0;b<B;b++)
clt_mdct_backward(&mode->mdct, &freq[b], out_syn[c]+NB*b, mode->window, overlap, shift, B);
} while (++c<CC);
}
RESTORE_STACK;