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code cleanup: all inverse MDCTs in the same function

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This commit is contained in:
Jean-Marc Valin 2007-12-08 01:13:34 +11:00
parent fb83fb422f
commit 1677aa9caa
1 changed files with 27 additions and 40 deletions
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67
libcelt/celt.c
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@ -166,6 +166,27 @@ static void compute_mdcts(mdct_lookup *mdct_lookup, float *window, float *in, fl
}
static void compute_inv_mdcts(mdct_lookup *mdct_lookup, float *window, float *X, float *out_mem, float *mdct_overlap, int N, int B)
{
int i;
for (i=0;i<B;i++)
{
int j;
float x[2*N];
float tmp[N];
/* De-interleaving the sub-frames */
for (j=0;j<N;j++)
tmp[j] = X[B*j+i];
mdct_backward(mdct_lookup, tmp, x);
for (j=0;j<2*N;j++)
x[j] = window[j]*x[j];
for (j=0;j<N;j++)
out_mem[MAX_PERIOD+(i-B)*N+j] = x[j]+mdct_overlap[j];
for (j=0;j<N;j++)
mdct_overlap[j] = x[N+j];
}
}
int celt_encode(CELTEncoder *st, short *pcm)
{
int i, N, B;
@ -261,22 +282,11 @@ int celt_encode(CELTEncoder *st, short *pcm)
CELT_MOVE(st->out_mem, st->out_mem+B*N, MAX_PERIOD-B*N);
/* Compute inverse MDCTs */
compute_inv_mdcts(&st->mdct_lookup, st->window, X, st->out_mem, st->mdct_overlap, N, B);
for (i=0;i<B;i++)
{
int j;
float x[2*N];
float tmp[N];
/* De-interleaving the sub-frames */
for (j=0;j<N;j++)
tmp[j] = X[B*j+i];
mdct_backward(&st->mdct_lookup, tmp, x);
for (j=0;j<2*N;j++)
x[j] = st->window[j]*x[j];
for (j=0;j<N;j++)
st->out_mem[MAX_PERIOD+(i-B)*N+j] = x[j]+st->mdct_overlap[j];
for (j=0;j<N;j++)
st->mdct_overlap[j] = x[N+j];
for (j=0;j<N;j++)
{
float tmp = st->out_mem[MAX_PERIOD+(i-B)*N+j] + st->preemph*st->preemph_memD;
@ -394,27 +404,16 @@ int celt_decode_lost(CELTDecoder *st, short *pcm)
pitch_index = st->last_pitch_index;
/* Pitch MDCT */
/* Use the pitch MDCT as the "guessed" signal */
compute_mdcts(&st->mdct_lookup, st->window, st->out_mem+pitch_index, X, N, B);
CELT_MOVE(st->out_mem, st->out_mem+B*N, MAX_PERIOD-B*N);
/* Compute inverse MDCTs */
compute_inv_mdcts(&st->mdct_lookup, st->window, X, st->out_mem, st->mdct_overlap, N, B);
for (i=0;i<B;i++)
{
int j;
float x[2*N];
float tmp[N];
/* De-interleaving the sub-frames */
for (j=0;j<N;j++)
tmp[j] = X[B*j+i];
mdct_backward(&st->mdct_lookup, tmp, x);
for (j=0;j<2*N;j++)
x[j] = st->window[j]*x[j];
for (j=0;j<N;j++)
st->out_mem[MAX_PERIOD+(i-B)*N+j] = x[j]+st->mdct_overlap[j];
for (j=0;j<N;j++)
st->mdct_overlap[j] = x[N+j];
for (j=0;j<N;j++)
{
float tmp = st->out_mem[MAX_PERIOD+(i-B)*N+j] + st->preemph*st->preemph_memD;
@ -482,22 +481,10 @@ int celt_decode(CELTDecoder *st, char *data, int len, short *pcm)
CELT_MOVE(st->out_mem, st->out_mem+B*N, MAX_PERIOD-B*N);
/* Compute inverse MDCTs */
compute_inv_mdcts(&st->mdct_lookup, st->window, X, st->out_mem, st->mdct_overlap, N, B);
for (i=0;i<B;i++)
{
int j;
float x[2*N];
float tmp[N];
/* De-interleaving the sub-frames */
for (j=0;j<N;j++)
tmp[j] = X[B*j+i];
mdct_backward(&st->mdct_lookup, tmp, x);
for (j=0;j<2*N;j++)
x[j] = st->window[j]*x[j];
for (j=0;j<N;j++)
st->out_mem[MAX_PERIOD+(i-B)*N+j] = x[j]+st->mdct_overlap[j];
for (j=0;j<N;j++)
st->mdct_overlap[j] = x[N+j];
for (j=0;j<N;j++)
{
float tmp = st->out_mem[MAX_PERIOD+(i-B)*N+j] + st->preemph*st->preemph_memD;