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| author | Michael Niedermayer <michaelni@gmx.at> | 2008-09-23 22:49:22 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2008-09-23 22:49:22 +0000 |
| commit | 571bbaf81490997218cb74eb0a0e69ae24cbe85e (patch) | |
| tree | d792068243d062966863f88d75c9e693fea4044e /libavcodec/ra288.c | |
| parent | b6bd726843c647e01b91c1c8cfa00f3ecb83960c (diff) | |
| download | ffmpeg-571bbaf81490997218cb74eb0a0e69ae24cbe85e.tar.gz | |
Factorize lpc code slightly.
Originally committed as revision 15393 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ra288.c')
| -rw-r--r-- | libavcodec/ra288.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c index 1f177b5f5d..c56718a521 100644 --- a/libavcodec/ra288.c +++ b/libavcodec/ra288.c @@ -79,12 +79,6 @@ static void decode(RA288Context *ractx, float gain, int cb_coef) memmove(ractx->sp_hist + 70, ractx->sp_hist + 75, 36*sizeof(*block)); - for (i=0; i < 5; i++) { - block[i] = 0.; - for (j=0; j < 36; j++) - block[i] -= block[i-1-j]*ractx->sp_lpc[j]; - } - /* block 46 of G.728 spec */ sum = 32.; for (i=0; i < 10; i++) @@ -108,9 +102,13 @@ static void decode(RA288Context *ractx, float gain, int cb_coef) gain_block[9] = 10 * log10(sum) - 32; - for (i=1; i < 5; i++) - for (j=i-1; j >= 0; j--) - buffer[i] -= ractx->sp_lpc[i-j-1] * buffer[j]; + for (i=0; i < 5; i++) { + block[i] = 0; + 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++) |