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Merge the 2 lpc loops.

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This changes the output by (stddev:    0.21 PSNR:109.51, file:ddinterview28.ra),
the changes are due to float rounding inaccuracies and do not happen if doubles
are used.

Originally committed as revision 15394 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-09-23 23:16:48 +00:00
parent 571bbaf814
commit 645a6be1e7
1 changed files with 2 additions and 4 deletions
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6
libavcodec/ra288.c
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@ -103,16 +103,14 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
gain_block[9] = 10 * log10(sum) - 32;
for (i=0; i < 5; i++) {
block[i] = 0;
block[i] = buffer[i];
for (j=0; j < 36; j++)
block[i] -= block[i-1-j]*ractx->sp_lpc[j];
for (j=0; j < i; j++)
buffer[i] -= buffer[i-1-j]*ractx->sp_lpc[j];
}
/* output */
for (i=0; i < 5; i++)
block[i] = av_clipf(block[i] + buffer[i], -4095, 4095);
block[i] = av_clipf(block[i], -4095, 4095);
}
static void convolve(float *tgt, const float *src, int len, int n)