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Get rid of the 512 sample memmove().

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Originally committed as revision 15048 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-08-30 10:41:53 +00:00
parent 9d2526d1b9
commit 47f0e05295
1 changed files with 10 additions and 4 deletions
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14
libavcodec/dca.c
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@ -159,6 +159,7 @@ typedef struct {
float subband_samples_hist[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];
float subband_fir_hist[DCA_PRIM_CHANNELS_MAX][512];
float subband_fir_noidea[DCA_PRIM_CHANNELS_MAX][32];
int hist_index[DCA_PRIM_CHANNELS_MAX];
int output; ///< type of output
int bias; ///< output bias
@ -658,7 +659,7 @@ static void qmf_32_subbands(DCAContext * s, int chans,
int i, j, k;
float praXin[33], *raXin = &praXin[1];
float *subband_fir_hist = s->subband_fir_hist[chans];
int hist_index= s->hist_index[chans];
float *subband_fir_hist2 = s->subband_fir_noidea[chans];
int chindex = 0, subindex;
@ -673,6 +674,7 @@ static void qmf_32_subbands(DCAContext * s, int chans,
/* Reconstructed channel sample index */
for (subindex = 0; subindex < 8; subindex++) {
float *subband_fir_hist = s->subband_fir_hist[chans] + hist_index;
/* Load in one sample from each subband and clear inactive subbands */
for (i = 0; i < s->subband_activity[chans]; i++)
raXin[i] = samples_in[i][subindex];
@ -696,17 +698,21 @@ static void qmf_32_subbands(DCAContext * s, int chans,
for (k = 31, i = 0; i < 32; i++, k--){
float a= subband_fir_hist2[i];
float b= 0;
for (j = 0; j < 512; j += 64){
for (j = 0; j < 512-hist_index; j += 64){
a += prCoeff[i+j ]*( subband_fir_hist[i+j] - subband_fir_hist[j+k]);
b += prCoeff[i+j+32]*(-subband_fir_hist[i+j] - subband_fir_hist[j+k]);
}
for ( ; j < 512; j += 64){
a += prCoeff[i+j ]*( subband_fir_hist[i+j-512] - subband_fir_hist[j+k-512]);
b += prCoeff[i+j+32]*(-subband_fir_hist[i+j-512] - subband_fir_hist[j+k-512]);
}
samples_out[chindex++] = a * scale + bias;
subband_fir_hist2[i] = b;
}
/* Update working arrays */
memmove(&subband_fir_hist[32], &subband_fir_hist[0], (512 - 32) * sizeof(float));
hist_index = (hist_index-32)&511;
}
s->hist_index[chans]= hist_index;
}
static void lfe_interpolation_fir(int decimation_select,