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Assembler optimised FLAC 24 bit handling routines for Coldfire based players. Decoding speed should be improved drastically. Haven't got so many 24 bit files myself, so let me know if something sounds off.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11329 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2006-10-25 00:59:38 +00:00
parent 73c0cfa632
commit 4134e91950
3 changed files with 299 additions and 40 deletions
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13
apps/codecs/libffmpegFLAC/decoder.c
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@ -262,10 +262,12 @@ static int decode_subframe_lpc(FLACContext *s, int32_t* decoded, int pred_order)
if ((s->bps + coeff_prec + av_log2(pred_order)) <= 32) {
#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
(void)sum;
lpc_decode_emac(s->blocksize - pred_order, qlevel, pred_order, decoded + pred_order, coeffs);
lpc_decode_emac(s->blocksize - pred_order, qlevel, pred_order,
decoded + pred_order, coeffs);
#elif defined(CPU_ARM) && !defined(SIMULATOR)
(void)sum;
lpc_decode_arm(s->blocksize - pred_order, qlevel, pred_order, decoded + pred_order, coeffs);
lpc_decode_arm(s->blocksize - pred_order, qlevel, pred_order,
decoded + pred_order, coeffs);
#else
for (i = pred_order; i < s->blocksize; i++)
{
@ -276,6 +278,12 @@ static int decode_subframe_lpc(FLACContext *s, int32_t* decoded, int pred_order)
}
#endif
} else {
#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
(void)wsum;
(void)j;
lpc_decode_emac_wide(s->blocksize - pred_order, qlevel, pred_order,
decoded + pred_order, coeffs);
#else
for (i = pred_order; i < s->blocksize; i++)
{
wsum = 0;
@ -283,6 +291,7 @@ static int decode_subframe_lpc(FLACContext *s, int32_t* decoded, int pred_order)
wsum += (int64_t)coeffs[j] * (int64_t)decoded[i-j-1];
decoded[i] += wsum >> qlevel;
}
#endif
}
return 0;