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author | Mashiat Sarker Shakkhar <shahriman_ams@yahoo.com> | 2011-11-06 03:02:11 +0600 |
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committer | Mashiat Sarker Shakkhar <shahriman_ams@yahoo.com> | 2011-11-20 14:51:39 +0600 |
commit | 0faae518e927b791e86f5a43b919a5c6e882d9b5 (patch) | |
tree | 48cdb0fbaa472d2143e477f08dfcdd79cef6b2e7 | |
parent | 03684c8ff33c8afd7edc0ffbf2f3b01101bb0e1d (diff) | |
download | ffmpeg-0faae518e927b791e86f5a43b919a5c6e882d9b5.tar.gz |
Implement lms_predict()
-rw-r--r-- | libavcodec/wmalosslessdec.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c index 5c6eed1744..eafe145aae 100644 --- a/libavcodec/wmalosslessdec.c +++ b/libavcodec/wmalosslessdec.c @@ -754,6 +754,23 @@ static void reset_codec(WmallDecodeCtx *s) +static int lms_predict(WmallDecodeCtx *s, int ich, int ilms) +{ + int32_t pred, icoef; + int recent = s->cdlms[ich][ilms].recent; + + for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++) + pred += s->cdlms[ich][ilms].coefs[icoef] * + s->cdlms[ich][ilms].lms_prevvalues[icoef + recent]; + + pred += (1 << (s->cdlms[ich][ilms].scaling - 1)); + /* XXX: Table 29 has: + iPred >= cdlms[iCh][ilms].scaling; + seems to me like a missing > */ + pred >>= s->cdlms[ich][ilms].scaling; + return pred; +} + /** *@brief Decode a single subframe (block). *@param s codec context |