FIXR(1.68179283050742908605),
};
+void ff_mpa_synth_init(MPA_INT *window);
static MPA_INT window[512] __attribute__((aligned(16)));
/* layer 1 unscaling */
scale_factor_mult[i][2]);
}
- /* window */
- /* max = 18760, max sum over all 16 coefs : 44736 */
- for(i=0;i<257;i++) {
- int v;
- v = mpa_enwindow[i];
-#if WFRAC_BITS < 16
- v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
-#endif
- window[i] = v;
- if ((i & 63) != 0)
- v = -v;
- if (i != 0)
- window[512 - i] = v;
- }
+ ff_mpa_synth_init(window);
/* huffman decode tables */
huff_code_table[0] = NULL;
sum2 op2 MULS((w2)[7 * 64], tmp);\
}
+void ff_mpa_synth_init(MPA_INT *window)
+{
+ int i;
+
+ /* max = 18760, max sum over all 16 coefs : 44736 */
+ for(i=0;i<257;i++) {
+ int v;
+ v = mpa_enwindow[i];
+#if WFRAC_BITS < 16
+ v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
+#endif
+ window[i] = v;
+ if ((i & 63) != 0)
+ v = -v;
+ if (i != 0)
+ window[512 - i] = v;
+ }
+}
/* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
32 samples. */
/* XXX: optimize by avoiding ring buffer usage */
-static void synth_filter(MPADecodeContext *s1,
- int ch, int16_t *samples, int incr,
+void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
+ MPA_INT *window,
+ int16_t *samples, int incr,
int32_t sb_samples[SBLIMIT])
{
int32_t tmp[32];
#else
int64_t sum, sum2;
#endif
-
+
dct32(tmp, sb_samples);
- offset = s1->synth_buf_offset[ch];
- synth_buf = s1->synth_buf[ch] + offset;
+ offset = *synth_buf_offset;
+ synth_buf = synth_buf_ptr + offset;
for(j=0;j<32;j++) {
v = tmp[j];
*samples = round_sample(sum);
offset = (offset - 32) & 511;
- s1->synth_buf_offset[ch] = offset;
+ *synth_buf_offset = offset;
}
/* cos(pi*i/24) */
for(ch=0;ch<s->nb_channels;ch++) {
samples_ptr = samples + ch;
for(i=0;i<nb_frames;i++) {
- synth_filter(s, ch, samples_ptr, s->nb_channels,
+ ff_mpa_synth_filter(s->synth_buf[ch], &(s->synth_buf_offset[ch]),
+ window,
+ samples_ptr, s->nb_channels,
s->sb_samples[ch][i]);
samples_ptr += 32 * s->nb_channels;
}