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Moved mdct state and window to the mode so it can be shared between multiple

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encoders and decoders.
This commit is contained in:
Jean-Marc Valin 2008-02-29 21:08:49 +11:00
parent 37131e3ab3
commit 81b38c2295
5 changed files with 50 additions and 47 deletions
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20
libcelt/modes.c
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@ -212,6 +212,7 @@ static void compute_allocation_table(CELTMode *mode, int res)
CELTMode *celt_mode_create(int Fs, int channels, int frame_size, int lookahead, int *error)
{
int res;
int N, N2, N4, i;
CELTMode *mode;
/* The good thing here is that permutation of the arguments will automatically be invalid */
@ -259,6 +260,22 @@ CELTMode *celt_mode_create(int Fs, int channels, int frame_size, int lookahead,
compute_allocation_table(mode, res);
compute_alloc_cache(mode);
/*printf ("%d bands\n", mode->nbEBands);*/
N = mode->mdctSize;
N2 = N/2;
N4 = N/4;
mdct_init(&mode->mdct, 2*N);
mode->window = (celt_word16_t*)celt_alloc(2*N*sizeof(celt_word16_t));
for (i=0;i<2*N;i++)
mode->window[i] = 0;
for (i=0;i<mode->overlap;i++)
mode->window[N4+i] = mode->window[2*N-N4-i-1]
= Q15ONE*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap));
for (i=0;i<2*N4;i++)
mode->window[N-N4+i] = Q15ONE;
mode->marker_start = MODEVALID;
mode->marker_end = MODEVALID;
return mode;
@ -283,6 +300,9 @@ void celt_mode_destroy(CELTMode *mode)
}
}
celt_free((int**)mode->bits);
mdct_clear(&mode->mdct);
celt_free(mode->window);
mode->marker_start = MODEFREED;
mode->marker_end = MODEFREED;
celt_free((CELTMode *)mode);